Merge pull request #1210 from adamhathcock/adam/issue-1206

OpenAsyncReader, OpenAsyncArchive and others must be async for Tar detection

AGENTS.md

@@ -103,8 +103,11 @@ tests/
 ### Factory Pattern
 Factory implementations can implement one or more interfaces (`IArchiveFactory`, `IReaderFactory`, `IWriterFactory`) depending on format capabilities:
 - `ArchiveFactory.OpenArchive()` - Opens archive API objects from seekable streams/files
+- `ArchiveFactory.OpenAsyncArchive()` - Opens async archive API objects for async archive use cases
 - `ReaderFactory.OpenReader()` - Auto-detects and opens forward-only readers
+- `ReaderFactory.OpenAsyncReader()` - Auto-detects and opens forward-only async readers
 - `WriterFactory.OpenWriter()` - Creates a writer for a specified `ArchiveType`
+- `WriterFactory.OpenAsyncWriter()` - Creates an async writer for async write scenarios
 - Factories located in: `src/SharpCompress/Factories/`
 
 ## Nullable Reference Types
@@ -132,6 +135,9 @@ SharpCompress supports multiple archive and compression formats:
 ### Async/Await Patterns
 - All I/O operations support async/await with `CancellationToken`
 - Async methods follow the naming convention: `MethodNameAsync`
+- For async archive scenarios, prefer `ArchiveFactory.OpenAsyncArchive(...)` over sync `OpenArchive(...)`.
+- For async forward-only read scenarios, prefer `ReaderFactory.OpenAsyncReader(...)` over sync `OpenReader(...)`.
+- For async write scenarios, prefer `WriterFactory.OpenAsyncWriter(...)` over sync `OpenWriter(...)`.
 - Key async methods:
   - `WriteEntryToAsync` - Extract entry asynchronously
   - `WriteAllToDirectoryAsync` - Extract all entries asynchronously
@@ -199,7 +205,8 @@ SharpCompress supports multiple archive and compression formats:
 ## Common Pitfalls
 
 1. **Don't mix Archive and Reader APIs** - Archive needs seekable stream, Reader doesn't
-2. **Solid archives (Rar, 7Zip)** - Use `ExtractAllEntries()` for best performance, not individual entry extraction
-3. **Stream disposal** - Always set `LeaveStreamOpen` explicitly when needed (default is to close)
-4. **Tar + non-seekable stream** - Must provide file size or it will throw
-5. **Format detection** - Use `ReaderFactory.OpenReader()` for auto-detection, test with actual archive files
+2. **Don't mix sync and async open paths** - For async workflows use `OpenAsyncArchive`/`OpenAsyncReader`/`OpenAsyncWriter`, not `OpenArchive`/`OpenReader`/`OpenWriter`
+3. **Solid archives (Rar, 7Zip)** - Use `ExtractAllEntries()` for best performance, not individual entry extraction
+4. **Stream disposal** - Always set `LeaveStreamOpen` explicitly when needed (default is to close)
+5. **Tar + non-seekable stream** - Must provide file size or it will throw
+6. **Format detection** - Use `ReaderFactory.OpenReader()` / `ReaderFactory.OpenAsyncReader()` for auto-detection, test with actual archive files

docs/API.md

@@ -95,7 +95,7 @@ using (var archive = ZipArchive.OpenArchive("file.zip"))
 }
 
 // Async extraction (requires IAsyncArchive)
-using (var asyncArchive = await ZipArchive.OpenAsyncArchive("file.zip"))
+await using (var asyncArchive = await ZipArchive.OpenAsyncArchive("file.zip"))
 {
     await asyncArchive.WriteToDirectoryAsync(
         @"C:\output",
@@ -177,7 +177,7 @@ using (var reader = ReaderFactory.OpenReader(stream))
 
 // Async variants (use OpenAsyncReader to get IAsyncReader)
 using (var stream = File.OpenRead("file.zip"))
-using (var reader = await ReaderFactory.OpenAsyncReader(stream))
+await using (var reader = await ReaderFactory.OpenAsyncReader(stream))
 {
     while (await reader.MoveToNextEntryAsync())
     {
@@ -409,7 +409,7 @@ cts.CancelAfter(TimeSpan.FromMinutes(5));
 
 try
 {
-    using (var archive = await ZipArchive.OpenAsyncArchive("archive.zip"))
+    await using (var archive = await ZipArchive.OpenAsyncArchive("archive.zip"))
     {
         await archive.WriteToDirectoryAsync(
             @"C:\output",

src/SharpCompress/Archives/ArchiveFactory.Async.cs

@@ -22,7 +22,9 @@ public static partial class ArchiveFactory
         readerOptions ??= ReaderOptions.ForExternalStream;
         var factory = await FindFactoryAsync<IArchiveFactory>(stream, cancellationToken)
             .ConfigureAwait(false);
-        return factory.OpenAsyncArchive(stream, readerOptions);
+        return await factory
+            .OpenAsyncArchive(stream, readerOptions, cancellationToken)
+            .ConfigureAwait(false);
     }
 
     public static ValueTask<IAsyncArchive> OpenAsyncArchive(
@@ -45,7 +47,9 @@ public static partial class ArchiveFactory
 
         var factory = await FindFactoryAsync<IArchiveFactory>(fileInfo, cancellationToken)
             .ConfigureAwait(false);
-        return factory.OpenAsyncArchive(fileInfo, options);
+        return await factory
+            .OpenAsyncArchive(fileInfo, options, cancellationToken)
+            .ConfigureAwait(false);
     }
 
     public static async ValueTask<IAsyncArchive> OpenAsyncArchive(

src/SharpCompress/Archives/ArchiveFactory.cs

@@ -2,12 +2,9 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Options;
 using SharpCompress.Factories;
-using SharpCompress.IO;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives;

src/SharpCompress/Archives/GZip/GZipArchive.Factory.cs

@@ -20,14 +20,15 @@ public partial class GZipArchive
         >
 #endif
 {
-    public static IWritableAsyncArchive<GZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> OpenAsyncArchive(
         string path,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
+        cancellationToken.ThrowIfCancellationRequested();
         path.NotNullOrEmpty(nameof(path));
-        return (IWritableAsyncArchive<GZipWriterOptions>)
-            OpenArchive(new FileInfo(path), readerOptions ?? new ReaderOptions());
+        return OpenAsyncArchive(new FileInfo(path), readerOptions, cancellationToken);
     }
 
     public static IWritableArchive<GZipWriterOptions> OpenArchive(
@@ -103,30 +104,50 @@ public partial class GZipArchive
         );
     }
 
-    public static IWritableAsyncArchive<GZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> OpenAsyncArchive(
         Stream stream,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(stream, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(stream, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<GZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(fileInfo, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(fileInfo, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<GZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(streams, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<GZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(fileInfos, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<GZipWriterOptions>)OpenArchive(fileInfos, readerOptions));
+    }
 
     public static IWritableArchive<GZipWriterOptions> CreateArchive() => new GZipArchive();
 
-    public static IWritableAsyncArchive<GZipWriterOptions> CreateAsyncArchive() =>
-        new GZipArchive();
+    public static ValueTask<IWritableAsyncArchive<GZipWriterOptions>> CreateAsyncArchive() =>
+        new(new GZipArchive());
 
     public static bool IsGZipFile(string filePath) => IsGZipFile(new FileInfo(filePath));
 

src/SharpCompress/Archives/IArchiveFactory.cs

@@ -1,5 +1,6 @@
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Factories;
 using SharpCompress.Readers;
 
@@ -32,7 +33,13 @@ public interface IArchiveFactory : IFactory
     /// </summary>
     /// <param name="stream">An open, readable and seekable stream.</param>
     /// <param name="readerOptions">reading options.</param>
-    IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null);
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A <see cref="ValueTask{TResult}"/> containing the opened async archive.</returns>
+    ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
 
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
@@ -47,5 +54,10 @@ public interface IArchiveFactory : IFactory
     /// <param name="fileInfo">the file to open.</param>
     /// <param name="readerOptions">reading options.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
-    IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null);
+    /// <returns>A <see cref="ValueTask{TResult}"/> containing the opened async archive.</returns>
+    ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
 }

src/SharpCompress/Archives/IArchiveOpenable.cs

@@ -1,6 +1,7 @@
 #if NET8_0_OR_GREATER
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives;
@@ -18,19 +19,22 @@ public interface IArchiveOpenable<TSync, TASync>
 
     public static abstract TSync OpenArchive(Stream stream, ReaderOptions? readerOptions = null);
 
-    public static abstract TASync OpenAsyncArchive(
+    public static abstract ValueTask<TASync> OpenAsyncArchive(
         string path,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
-    public static abstract TASync OpenAsyncArchive(
+    public static abstract ValueTask<TASync> OpenAsyncArchive(
         Stream stream,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
-    public static abstract TASync OpenAsyncArchive(
+    public static abstract ValueTask<TASync> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 }
 

src/SharpCompress/Archives/IMultiArchiveOpenable.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives;
@@ -20,14 +21,16 @@ public interface IMultiArchiveOpenable<TSync, TASync>
         ReaderOptions? readerOptions = null
     );
 
-    public static abstract TASync OpenAsyncArchive(
+    public static abstract ValueTask<TASync> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
-    public static abstract TASync OpenAsyncArchive(
+    public static abstract ValueTask<TASync> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 }
 #endif

src/SharpCompress/Archives/IWritableArchiveOpenable.cs

@@ -1,3 +1,4 @@
+using System.Threading.Tasks;
 using SharpCompress.Common.Options;
 
 #if NET8_0_OR_GREATER
@@ -8,6 +9,6 @@ public interface IWritableArchiveOpenable<TOptions>
     where TOptions : IWriterOptions
 {
     public static abstract IWritableArchive<TOptions> CreateArchive();
-    public static abstract IWritableAsyncArchive<TOptions> CreateAsyncArchive();
+    public static abstract ValueTask<IWritableAsyncArchive<TOptions>> CreateAsyncArchive();
 }
 #endif

src/SharpCompress/Archives/Rar/RarArchive.Factory.cs

@@ -20,13 +20,15 @@ public partial class RarArchive
         IMultiArchiveOpenable<IRarArchive, IRarAsyncArchive>
 #endif
 {
-    public static IRarAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IRarAsyncArchive> OpenAsyncArchive(
         string path,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
+        cancellationToken.ThrowIfCancellationRequested();
         path.NotNullOrEmpty(nameof(path));
-        return (IRarAsyncArchive)OpenArchive(new FileInfo(path), readerOptions);
+        return new((IRarAsyncArchive)OpenArchive(new FileInfo(path), readerOptions));
     }
 
     public static IRarArchive OpenArchive(string filePath, ReaderOptions? options = null)
@@ -98,36 +100,44 @@ public partial class RarArchive
         );
     }
 
-    public static IRarAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IRarAsyncArchive> OpenAsyncArchive(
         Stream stream,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IRarAsyncArchive)OpenArchive(stream, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IRarAsyncArchive)OpenArchive(stream, readerOptions));
     }
 
-    public static IRarAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IRarAsyncArchive> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IRarAsyncArchive)OpenArchive(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IRarAsyncArchive)OpenArchive(fileInfo, readerOptions));
     }
 
-    public static IRarAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IRarAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IRarAsyncArchive)OpenArchive(streams, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IRarAsyncArchive)OpenArchive(streams, readerOptions));
     }
 
-    public static IRarAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IRarAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IRarAsyncArchive)OpenArchive(fileInfos, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IRarAsyncArchive)OpenArchive(fileInfos, readerOptions));
     }
 
     public static bool IsRarFile(string filePath) => IsRarFile(new FileInfo(filePath));

src/SharpCompress/Archives/SevenZip/SevenZipArchive.Factory.cs

@@ -16,10 +16,17 @@ public partial class SevenZipArchive
         IMultiArchiveOpenable<IArchive, IAsyncArchive>
 #endif
 {
-    public static IAsyncArchive OpenAsyncArchive(string path, ReaderOptions? readerOptions = null)
+    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
     {
+        cancellationToken.ThrowIfCancellationRequested();
         path.NotNullOrEmpty("path");
-        return (IAsyncArchive)OpenArchive(new FileInfo(path), readerOptions ?? new ReaderOptions());
+        return new(
+            (IAsyncArchive)OpenArchive(new FileInfo(path), readerOptions ?? new ReaderOptions())
+        );
     }
 
     public static IArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
@@ -86,33 +93,44 @@ public partial class SevenZipArchive
         );
     }
 
-    public static IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null)
+    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
     {
-        return (IAsyncArchive)OpenArchive(stream, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
     }
 
-    public static IAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
     }
 
-    public static IAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncArchive)OpenArchive(streams, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(streams, readerOptions));
     }
 
-    public static IAsyncArchive OpenAsyncArchive(
+    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfos, readerOptions));
     }
 
     public static bool IsSevenZipFile(string filePath) => IsSevenZipFile(new FileInfo(filePath));

src/SharpCompress/Archives/Tar/TarArchive.Factory.cs

@@ -7,6 +7,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Tar.Headers;
+using SharpCompress.Factories;
 using SharpCompress.IO;
 using SharpCompress.Readers;
 using SharpCompress.Writers.Tar;
@@ -37,12 +38,9 @@ public partial class TarArchive
     )
     {
         fileInfo.NotNull(nameof(fileInfo));
-        return new TarArchive(
-            new SourceStream(
-                fileInfo,
-                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                readerOptions ?? new ReaderOptions() { LeaveStreamOpen = false }
-            )
+        return OpenArchive(
+            [fileInfo],
+            readerOptions ?? new ReaderOptions() { LeaveStreamOpen = false }
         );
     }
 
@@ -53,13 +51,14 @@ public partial class TarArchive
     {
         fileInfos.NotNull(nameof(fileInfos));
         var files = fileInfos.ToArray();
-        return new TarArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions() { LeaveStreamOpen = false }
-            )
+        var sourceStream = new SourceStream(
+            files[0],
+            i => i < files.Length ? files[i] : null,
+            readerOptions ?? new ReaderOptions() { LeaveStreamOpen = false }
         );
+        var compressionType = TarFactory.GetCompressionType(sourceStream);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
     }
 
     public static IWritableArchive<TarWriterOptions> OpenArchive(
@@ -69,13 +68,14 @@ public partial class TarArchive
     {
         streams.NotNull(nameof(streams));
         var strms = streams.ToArray();
-        return new TarArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
+        var sourceStream = new SourceStream(
+            strms[0],
+            i => i < strms.Length ? strms[i] : null,
+            readerOptions ?? new ReaderOptions()
         );
+        var compressionType = TarFactory.GetCompressionType(sourceStream);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
     }
 
     public static IWritableArchive<TarWriterOptions> OpenArchive(
@@ -90,35 +90,97 @@ public partial class TarArchive
             throw new ArgumentException("Stream must be seekable", nameof(stream));
         }
 
-        return new TarArchive(
-            new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions())
-        );
+        return OpenArchive([stream], readerOptions);
     }
 
-    public static IWritableAsyncArchive<TarWriterOptions> OpenAsyncArchive(
+    public static async ValueTask<IWritableAsyncArchive<TarWriterOptions>> OpenAsyncArchive(
         Stream stream,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<TarWriterOptions>)OpenArchive(stream, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        stream.NotNull(nameof(stream));
+        var sourceStream = new SourceStream(
+            stream,
+            i => null,
+            readerOptions ?? new ReaderOptions()
+        );
+        var compressionType = await TarFactory
+            .GetCompressionTypeAsync(sourceStream, cancellationToken)
+            .ConfigureAwait(false);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
+    }
 
-    public static IWritableAsyncArchive<TarWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<TarWriterOptions>> OpenAsyncArchive(
         string path,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<TarWriterOptions>)OpenArchive(new FileInfo(path), readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return OpenAsyncArchive(new FileInfo(path), readerOptions, cancellationToken);
+    }
 
-    public static IWritableAsyncArchive<TarWriterOptions> OpenAsyncArchive(
+    public static async ValueTask<IWritableAsyncArchive<TarWriterOptions>> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<TarWriterOptions>)OpenArchive(fileInfo, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        fileInfo.NotNull(nameof(fileInfo));
+        readerOptions ??= new ReaderOptions() { LeaveStreamOpen = false };
+        var sourceStream = new SourceStream(fileInfo, i => null, readerOptions);
+        var compressionType = await TarFactory
+            .GetCompressionTypeAsync(sourceStream, cancellationToken)
+            .ConfigureAwait(false);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
+    }
 
-    public static IWritableAsyncArchive<TarWriterOptions> OpenAsyncArchive(
+    public static async ValueTask<IWritableAsyncArchive<TarWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<TarWriterOptions>)OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        var sourceStream = new SourceStream(
+            strms[0],
+            i => i < strms.Length ? strms[i] : null,
+            readerOptions ?? new ReaderOptions()
+        );
+        var compressionType = await TarFactory
+            .GetCompressionTypeAsync(sourceStream, cancellationToken)
+            .ConfigureAwait(false);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
+    }
 
-    public static IWritableAsyncArchive<TarWriterOptions> OpenAsyncArchive(
+    public static async ValueTask<IWritableAsyncArchive<TarWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<TarWriterOptions>)OpenArchive(fileInfos, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        var sourceStream = new SourceStream(
+            files[0],
+            i => i < files.Length ? files[i] : null,
+            readerOptions ?? new ReaderOptions() { LeaveStreamOpen = false }
+        );
+        var compressionType = await TarFactory
+            .GetCompressionTypeAsync(sourceStream, cancellationToken)
+            .ConfigureAwait(false);
+        sourceStream.Seek(0, SeekOrigin.Begin);
+        return new TarArchive(sourceStream, compressionType);
+    }
 
     public static bool IsTarFile(string filePath) => IsTarFile(new FileInfo(filePath));
 
@@ -183,5 +245,6 @@ public partial class TarArchive
 
     public static IWritableArchive<TarWriterOptions> CreateArchive() => new TarArchive();
 
-    public static IWritableAsyncArchive<TarWriterOptions> CreateAsyncArchive() => new TarArchive();
+    public static ValueTask<IWritableAsyncArchive<TarWriterOptions>> CreateAsyncArchive() =>
+        new(new TarArchive());
 }

src/SharpCompress/Archives/Tar/TarArchive.cs

@@ -2,38 +2,60 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
 using SharpCompress.Common;
-using SharpCompress.Common.Options;
 using SharpCompress.Common.Tar;
 using SharpCompress.Common.Tar.Headers;
+using SharpCompress.Compressors.BZip2;
+using SharpCompress.Compressors.Deflate;
+using SharpCompress.Compressors.LZMA;
+using SharpCompress.Compressors.Lzw;
+using SharpCompress.Compressors.Xz;
+using SharpCompress.Compressors.ZStandard;
 using SharpCompress.IO;
 using SharpCompress.Readers;
 using SharpCompress.Readers.Tar;
-using SharpCompress.Writers;
 using SharpCompress.Writers.Tar;
+using CompressionMode = SharpCompress.Compressors.CompressionMode;
+using Constants = SharpCompress.Common.Constants;
 
 namespace SharpCompress.Archives.Tar;
 
 public partial class TarArchive
     : AbstractWritableArchive<TarArchiveEntry, TarVolume, TarWriterOptions>
 {
+    private readonly CompressionType _compressionType;
+
     protected override IEnumerable<TarVolume> LoadVolumes(SourceStream sourceStream)
     {
         sourceStream.NotNull("SourceStream is null").LoadAllParts();
         return new TarVolume(sourceStream, ReaderOptions, 1).AsEnumerable();
     }
 
-    private TarArchive(SourceStream sourceStream)
-        : base(ArchiveType.Tar, sourceStream) { }
+    internal TarArchive(SourceStream sourceStream, CompressionType compressionType)
+        : base(ArchiveType.Tar, sourceStream)
+    {
+        _compressionType = compressionType;
+    }
 
     private TarArchive()
         : base(ArchiveType.Tar) { }
 
+    private Stream GetStream(Stream stream) =>
+        _compressionType switch
+        {
+            CompressionType.BZip2 => BZip2Stream.Create(stream, CompressionMode.Decompress, false),
+            CompressionType.GZip => new GZipStream(stream, CompressionMode.Decompress),
+            CompressionType.ZStandard => new ZStandardStream(stream),
+            CompressionType.LZip => new LZipStream(stream, CompressionMode.Decompress),
+            CompressionType.Xz => new XZStream(stream),
+            CompressionType.Lzw => new LzwStream(stream),
+            CompressionType.None => stream,
+            _ => throw new NotSupportedException("Invalid compression type: " + _compressionType),
+        };
+
     protected override IEnumerable<TarArchiveEntry> LoadEntries(IEnumerable<TarVolume> volumes)
     {
-        var stream = volumes.Single().Stream;
+        var stream = GetStream(volumes.Single().Stream);
         if (stream.CanSeek)
         {
             stream.Position = 0;
@@ -41,7 +63,9 @@ public partial class TarArchive
         TarHeader? previousHeader = null;
         foreach (
             var header in TarHeaderFactory.ReadHeader(
-                StreamingMode.Seekable,
+                _compressionType == CompressionType.None
+                    ? StreamingMode.Seekable
+                    : StreamingMode.Streaming,
                 stream,
                 ReaderOptions.ArchiveEncoding
             )
@@ -154,6 +178,6 @@ public partial class TarArchive
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return TarReader.OpenReader(stream);
+        return TarReader.OpenReader(GetStream(stream));
     }
 }

src/SharpCompress/Archives/Zip/ZipArchive.Factory.cs

@@ -95,30 +95,55 @@ public partial class ZipArchive
         );
     }
 
-    public static IWritableAsyncArchive<ZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> OpenAsyncArchive(
         string path,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(path, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(path, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<ZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> OpenAsyncArchive(
         Stream stream,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(stream, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(stream, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<ZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> OpenAsyncArchive(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(fileInfo, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(fileInfo, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<ZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(streams, readerOptions));
+    }
 
-    public static IWritableAsyncArchive<ZipWriterOptions> OpenAsyncArchive(
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => (IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(fileInfos, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IWritableAsyncArchive<ZipWriterOptions>)OpenArchive(fileInfos, readerOptions));
+    }
 
     public static bool IsZipFile(string filePath, string? password = null) =>
         IsZipFile(new FileInfo(filePath), password);
@@ -223,7 +248,8 @@ public partial class ZipArchive
 
     public static IWritableArchive<ZipWriterOptions> CreateArchive() => new ZipArchive();
 
-    public static IWritableAsyncArchive<ZipWriterOptions> CreateAsyncArchive() => new ZipArchive();
+    public static ValueTask<IWritableAsyncArchive<ZipWriterOptions>> CreateAsyncArchive() =>
+        new(new ZipArchive());
 
     public static async ValueTask<bool> IsZipMultiAsync(
         Stream stream,

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.Async.cs

@@ -0,0 +1,603 @@
+using System;
+using System.Buffers;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Common;
+using SharpCompress.Common.Rar.Headers;
+using SharpCompress.Compressors.Rar.UnpackV1.Decode;
+using SharpCompress.Compressors.Rar.UnpackV1.PPM;
+using SharpCompress.Compressors.Rar.VM;
+
+namespace SharpCompress.Compressors.Rar.UnpackV1;
+
+internal sealed partial class Unpack
+{
+    public async Task DoUnpackAsync(
+        FileHeader fileHeader,
+        Stream readStream,
+        Stream writeStream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        destUnpSize = fileHeader.UncompressedSize;
+        this.fileHeader = fileHeader;
+        this.readStream = readStream;
+        this.writeStream = writeStream;
+        if (!fileHeader.IsSolid)
+        {
+            Init();
+        }
+        suspended = false;
+        await DoUnpackAsync(cancellationToken).ConfigureAwait(false);
+    }
+
+    public async Task DoUnpackAsync(CancellationToken cancellationToken = default)
+    {
+        if (fileHeader.CompressionMethod == 0)
+        {
+            await UnstoreFileAsync(cancellationToken).ConfigureAwait(false);
+            return;
+        }
+        switch (fileHeader.CompressionAlgorithm)
+        {
+            case 15:
+                await unpack15Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
+                break;
+            case 20:
+            case 26:
+                await unpack20Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
+                break;
+            case 29:
+            case 36:
+                await Unpack29Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
+                break;
+            case 50:
+                await Unpack5Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
+                break;
+            default:
+                throw new InvalidFormatException(
+                    "unknown rar compression version " + fileHeader.CompressionAlgorithm
+                );
+        }
+    }
+
+    private async Task UnstoreFileAsync(CancellationToken cancellationToken = default)
+    {
+        var buffer = new byte[(int)Math.Min(0x10000, destUnpSize)];
+        do
+        {
+            var code = await readStream
+                .ReadAsync(buffer, 0, buffer.Length, cancellationToken)
+                .ConfigureAwait(false);
+            if (code == 0 || code == -1)
+            {
+                break;
+            }
+            code = code < destUnpSize ? code : (int)destUnpSize;
+            await writeStream.WriteAsync(buffer, 0, code, cancellationToken).ConfigureAwait(false);
+            destUnpSize -= code;
+        } while (!suspended && destUnpSize > 0);
+    }
+
+    private async Task Unpack29Async(bool solid, CancellationToken cancellationToken = default)
+    {
+        int[] DDecode = new int[PackDef.DC];
+        byte[] DBits = new byte[PackDef.DC];
+
+        int Bits;
+
+        if (DDecode[1] == 0)
+        {
+            int Dist = 0,
+                BitLength = 0,
+                Slot = 0;
+            for (var I = 0; I < DBitLengthCounts.Length; I++, BitLength++)
+            {
+                var count = DBitLengthCounts[I];
+                for (var J = 0; J < count; J++, Slot++, Dist += (1 << BitLength))
+                {
+                    DDecode[Slot] = Dist;
+                    DBits[Slot] = (byte)BitLength;
+                }
+            }
+        }
+
+        FileExtracted = true;
+
+        if (!suspended)
+        {
+            UnpInitData(solid);
+            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return;
+            }
+            if ((!solid || !tablesRead) && !ReadTables())
+            {
+                return;
+            }
+        }
+
+        if (ppmError)
+        {
+            return;
+        }
+
+        while (true)
+        {
+            unpPtr &= PackDef.MAXWINMASK;
+
+            if (inAddr > readBorder)
+            {
+                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+            }
+
+            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 260 && wrPtr != unpPtr)
+            {
+                UnpWriteBuf();
+                if (destUnpSize < 0)
+                {
+                    return;
+                }
+                if (suspended)
+                {
+                    FileExtracted = false;
+                    return;
+                }
+            }
+            if (unpBlockType == BlockTypes.BLOCK_PPM)
+            {
+                var Ch = ppm.DecodeChar();
+                if (Ch == -1)
+                {
+                    ppmError = true;
+                    break;
+                }
+                if (Ch == PpmEscChar)
+                {
+                    var NextCh = ppm.DecodeChar();
+                    if (NextCh == 0)
+                    {
+                        if (!ReadTables())
+                        {
+                            break;
+                        }
+                        continue;
+                    }
+                    if (NextCh == 2 || NextCh == -1)
+                    {
+                        break;
+                    }
+                    if (NextCh == 3)
+                    {
+                        if (!ReadVMCodePPM())
+                        {
+                            break;
+                        }
+                        continue;
+                    }
+                    if (NextCh == 4)
+                    {
+                        int Distance = 0,
+                            Length = 0;
+                        var failed = false;
+                        for (var I = 0; I < 4 && !failed; I++)
+                        {
+                            var ch = ppm.DecodeChar();
+                            if (ch == -1)
+                            {
+                                failed = true;
+                            }
+                            else
+                            {
+                                if (I == 3)
+                                {
+                                    Length = ch & 0xff;
+                                }
+                                else
+                                {
+                                    Distance = (Distance << 8) + (ch & 0xff);
+                                }
+                            }
+                        }
+                        if (failed)
+                        {
+                            break;
+                        }
+                        CopyString(Length + 32, Distance + 2);
+                        continue;
+                    }
+                    if (NextCh == 5)
+                    {
+                        var Length = ppm.DecodeChar();
+                        if (Length == -1)
+                        {
+                            break;
+                        }
+                        CopyString(Length + 4, 1);
+                        continue;
+                    }
+                }
+                window[unpPtr++] = (byte)Ch;
+                continue;
+            }
+
+            var Number = this.decodeNumber(LD);
+            if (Number < 256)
+            {
+                window[unpPtr++] = (byte)Number;
+                continue;
+            }
+            if (Number >= 271)
+            {
+                var Length = LDecode[Number -= 271] + 3;
+                if ((Bits = LBits[Number]) > 0)
+                {
+                    Length += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+
+                var DistNumber = this.decodeNumber(DD);
+                var Distance = DDecode[DistNumber] + 1;
+                if ((Bits = DBits[DistNumber]) > 0)
+                {
+                    if (DistNumber > 9)
+                    {
+                        if (Bits > 4)
+                        {
+                            Distance += ((Utility.URShift(GetBits(), (20 - Bits))) << 4);
+                            AddBits(Bits - 4);
+                        }
+                        if (lowDistRepCount > 0)
+                        {
+                            lowDistRepCount--;
+                            Distance += prevLowDist;
+                        }
+                        else
+                        {
+                            var LowDist = this.decodeNumber(LDD);
+                            if (LowDist == 16)
+                            {
+                                lowDistRepCount = PackDef.LOW_DIST_REP_COUNT - 1;
+                                Distance += prevLowDist;
+                            }
+                            else
+                            {
+                                Distance += LowDist;
+                                prevLowDist = LowDist;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        Distance += Utility.URShift(GetBits(), (16 - Bits));
+                        AddBits(Bits);
+                    }
+                }
+
+                if (Distance >= 0x2000)
+                {
+                    Length++;
+                    if (Distance >= 0x40000L)
+                    {
+                        Length++;
+                    }
+                }
+
+                InsertOldDist(Distance);
+                InsertLastMatch(Length, Distance);
+                CopyString(Length, Distance);
+                continue;
+            }
+            if (Number == 256)
+            {
+                if (!ReadEndOfBlock())
+                {
+                    break;
+                }
+                continue;
+            }
+            if (Number == 257)
+            {
+                if (!ReadVMCode())
+                {
+                    break;
+                }
+                continue;
+            }
+            if (Number == 258)
+            {
+                if (lastLength != 0)
+                {
+                    CopyString(lastLength, lastDist);
+                }
+                continue;
+            }
+            if (Number < 263)
+            {
+                var DistNum = Number - 259;
+                var Distance = oldDist[DistNum];
+                for (var I = DistNum; I > 0; I--)
+                {
+                    oldDist[I] = oldDist[I - 1];
+                }
+                oldDist[0] = Distance;
+
+                var LengthNumber = this.decodeNumber(RD);
+                var Length = LDecode[LengthNumber] + 2;
+                if ((Bits = LBits[LengthNumber]) > 0)
+                {
+                    Length += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+                InsertLastMatch(Length, Distance);
+                CopyString(Length, Distance);
+                continue;
+            }
+            if (Number < 272)
+            {
+                var Distance = SDDecode[Number -= 263] + 1;
+                if ((Bits = SDBits[Number]) > 0)
+                {
+                    Distance += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+                InsertOldDist(Distance);
+                InsertLastMatch(2, Distance);
+                CopyString(2, Distance);
+            }
+        }
+        UnpWriteBuf();
+    }
+
+    private async Task UnpWriteBufAsync(CancellationToken cancellationToken = default)
+    {
+        var WrittenBorder = wrPtr;
+        var WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
+        for (var I = 0; I < prgStack.Count; I++)
+        {
+            var flt = prgStack[I];
+            if (flt is null)
+            {
+                continue;
+            }
+            if (flt.NextWindow)
+            {
+                flt.NextWindow = false;
+                continue;
+            }
+            var BlockStart = flt.BlockStart;
+            var BlockLength = flt.BlockLength;
+            if (((BlockStart - WrittenBorder) & PackDef.MAXWINMASK) < WriteSize)
+            {
+                if (WrittenBorder != BlockStart)
+                {
+                    await UnpWriteAreaAsync(WrittenBorder, BlockStart, cancellationToken)
+                        .ConfigureAwait(false);
+                    WrittenBorder = BlockStart;
+                    WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
+                }
+                if (BlockLength <= WriteSize)
+                {
+                    var BlockEnd = (BlockStart + BlockLength) & PackDef.MAXWINMASK;
+                    if (BlockStart < BlockEnd || BlockEnd == 0)
+                    {
+                        rarVM.setMemory(0, window, BlockStart, BlockLength);
+                    }
+                    else
+                    {
+                        var FirstPartLength = PackDef.MAXWINSIZE - BlockStart;
+                        rarVM.setMemory(0, window, BlockStart, FirstPartLength);
+                        rarVM.setMemory(FirstPartLength, window, 0, BlockEnd);
+                    }
+
+                    var ParentPrg = filters[flt.ParentFilter].Program;
+                    var Prg = flt.Program;
+
+                    if (ParentPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
+                    {
+                        Prg.GlobalData.Clear();
+                        for (
+                            var i = 0;
+                            i < ParentPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
+                            i++
+                        )
+                        {
+                            Prg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] = ParentPrg.GlobalData[
+                                RarVM.VM_FIXEDGLOBALSIZE + i
+                            ];
+                        }
+                    }
+
+                    ExecuteCode(Prg);
+
+                    if (Prg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
+                    {
+                        if (ParentPrg.GlobalData.Count < Prg.GlobalData.Count)
+                        {
+                            ParentPrg.GlobalData.SetSize(Prg.GlobalData.Count);
+                        }
+
+                        for (var i = 0; i < Prg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE; i++)
+                        {
+                            ParentPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] = Prg.GlobalData[
+                                RarVM.VM_FIXEDGLOBALSIZE + i
+                            ];
+                        }
+                    }
+                    else
+                    {
+                        ParentPrg.GlobalData.Clear();
+                    }
+
+                    var FilteredDataOffset = Prg.FilteredDataOffset;
+                    var FilteredDataSize = Prg.FilteredDataSize;
+                    var FilteredData = ArrayPool<byte>.Shared.Rent(FilteredDataSize);
+                    try
+                    {
+                        Array.Copy(
+                            rarVM.Mem,
+                            FilteredDataOffset,
+                            FilteredData,
+                            0,
+                            FilteredDataSize
+                        );
+
+                        prgStack[I] = null;
+                        while (I + 1 < prgStack.Count)
+                        {
+                            var NextFilter = prgStack[I + 1];
+                            if (
+                                NextFilter is null
+                                || NextFilter.BlockStart != BlockStart
+                                || NextFilter.BlockLength != FilteredDataSize
+                                || NextFilter.NextWindow
+                            )
+                            {
+                                break;
+                            }
+
+                            rarVM.setMemory(0, FilteredData, 0, FilteredDataSize);
+
+                            var pPrg = filters[NextFilter.ParentFilter].Program;
+                            var NextPrg = NextFilter.Program;
+
+                            if (pPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
+                            {
+                                NextPrg.GlobalData.SetSize(pPrg.GlobalData.Count);
+
+                                for (
+                                    var i = 0;
+                                    i < pPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
+                                    i++
+                                )
+                                {
+                                    NextPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] =
+                                        pPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i];
+                                }
+                            }
+
+                            ExecuteCode(NextPrg);
+
+                            if (NextPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
+                            {
+                                if (pPrg.GlobalData.Count < NextPrg.GlobalData.Count)
+                                {
+                                    pPrg.GlobalData.SetSize(NextPrg.GlobalData.Count);
+                                }
+
+                                for (
+                                    var i = 0;
+                                    i < NextPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
+                                    i++
+                                )
+                                {
+                                    pPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] =
+                                        NextPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i];
+                                }
+                            }
+                            else
+                            {
+                                pPrg.GlobalData.Clear();
+                            }
+
+                            FilteredDataOffset = NextPrg.FilteredDataOffset;
+                            FilteredDataSize = NextPrg.FilteredDataSize;
+                            if (FilteredData.Length < FilteredDataSize)
+                            {
+                                ArrayPool<byte>.Shared.Return(FilteredData);
+                                FilteredData = ArrayPool<byte>.Shared.Rent(FilteredDataSize);
+                            }
+                            for (var i = 0; i < FilteredDataSize; i++)
+                            {
+                                FilteredData[i] = NextPrg.GlobalData[FilteredDataOffset + i];
+                            }
+
+                            I++;
+                            prgStack[I] = null;
+                        }
+
+                        await writeStream
+                            .WriteAsync(FilteredData, 0, FilteredDataSize, cancellationToken)
+                            .ConfigureAwait(false);
+                        writtenFileSize += FilteredDataSize;
+                        destUnpSize -= FilteredDataSize;
+                        WrittenBorder = BlockEnd;
+                        WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
+                    }
+                    finally
+                    {
+                        ArrayPool<byte>.Shared.Return(FilteredData);
+                    }
+                }
+                else
+                {
+                    for (var J = I; J < prgStack.Count; J++)
+                    {
+                        var filt = prgStack[J];
+                        if (filt != null && filt.NextWindow)
+                        {
+                            filt.NextWindow = false;
+                        }
+                    }
+                    wrPtr = WrittenBorder;
+                    return;
+                }
+            }
+        }
+
+        await UnpWriteAreaAsync(WrittenBorder, unpPtr, cancellationToken).ConfigureAwait(false);
+        wrPtr = unpPtr;
+    }
+
+    private async Task UnpWriteAreaAsync(
+        int startPtr,
+        int endPtr,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (endPtr < startPtr)
+        {
+            await UnpWriteDataAsync(
+                    window,
+                    startPtr,
+                    -startPtr & PackDef.MAXWINMASK,
+                    cancellationToken
+                )
+                .ConfigureAwait(false);
+            await UnpWriteDataAsync(window, 0, endPtr, cancellationToken).ConfigureAwait(false);
+        }
+        else
+        {
+            await UnpWriteDataAsync(window, startPtr, endPtr - startPtr, cancellationToken)
+                .ConfigureAwait(false);
+        }
+    }
+
+    private async Task UnpWriteDataAsync(
+        byte[] data,
+        int offset,
+        int size,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (destUnpSize < 0)
+        {
+            return;
+        }
+        var writeSize = size;
+        if (writeSize > destUnpSize)
+        {
+            writeSize = (int)destUnpSize;
+        }
+        await writeStream
+            .WriteAsync(data, offset, writeSize, cancellationToken)
+            .ConfigureAwait(false);
+
+        writtenFileSize += size;
+        destUnpSize -= size;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack.cs

@@ -150,25 +150,6 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         DoUnpack();
     }
 
-    public async System.Threading.Tasks.Task DoUnpackAsync(
-        FileHeader fileHeader,
-        Stream readStream,
-        Stream writeStream,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        destUnpSize = fileHeader.UncompressedSize;
-        this.fileHeader = fileHeader;
-        this.readStream = readStream;
-        this.writeStream = writeStream;
-        if (!fileHeader.IsSolid)
-        {
-            Init();
-        }
-        suspended = false;
-        await DoUnpackAsync(cancellationToken).ConfigureAwait(false);
-    }
-
     public void DoUnpack()
     {
         if (fileHeader.CompressionMethod == 0)
@@ -203,42 +184,6 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         }
     }
 
-    public async System.Threading.Tasks.Task DoUnpackAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (fileHeader.CompressionMethod == 0)
-        {
-            await UnstoreFileAsync(cancellationToken).ConfigureAwait(false);
-            return;
-        }
-        switch (fileHeader.CompressionAlgorithm)
-        {
-            case 15: // rar 1.5 compression
-                await unpack15Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
-                break;
-
-            case 20: // rar 2.x compression
-            case 26: // files larger than 2GB
-                await unpack20Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
-                break;
-
-            case 29: // rar 3.x compression
-            case 36: // alternative hash
-                await Unpack29Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
-                break;
-
-            case 50: // rar 5.x compression
-                await Unpack5Async(fileHeader.IsSolid, cancellationToken).ConfigureAwait(false);
-                break;
-
-            default:
-                throw new InvalidFormatException(
-                    "unknown rar compression version " + fileHeader.CompressionAlgorithm
-                );
-        }
-    }
-
     private void UnstoreFile()
     {
         Span<byte> buffer = stackalloc byte[(int)Math.Min(0x10000, destUnpSize)];
@@ -255,26 +200,6 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         } while (!suspended && destUnpSize > 0);
     }
 
-    private async System.Threading.Tasks.Task UnstoreFileAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var buffer = new byte[(int)Math.Min(0x10000, destUnpSize)];
-        do
-        {
-            var code = await readStream
-                .ReadAsync(buffer, 0, buffer.Length, cancellationToken)
-                .ConfigureAwait(false);
-            if (code == 0 || code == -1)
-            {
-                break;
-            }
-            code = code < destUnpSize ? code : (int)destUnpSize;
-            await writeStream.WriteAsync(buffer, 0, code, cancellationToken).ConfigureAwait(false);
-            destUnpSize -= code;
-        } while (!suspended && destUnpSize > 0);
-    }
-
     private void Unpack29(bool solid)
     {
         Span<int> DDecode = stackalloc int[PackDef.DC];
@@ -553,281 +478,6 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         UnpWriteBuf();
     }
 
-    private async System.Threading.Tasks.Task Unpack29Async(
-        bool solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        int[] DDecode = new int[PackDef.DC];
-        byte[] DBits = new byte[PackDef.DC];
-
-        int Bits;
-
-        if (DDecode[1] == 0)
-        {
-            int Dist = 0,
-                BitLength = 0,
-                Slot = 0;
-            for (var I = 0; I < DBitLengthCounts.Length; I++, BitLength++)
-            {
-                var count = DBitLengthCounts[I];
-                for (var J = 0; J < count; J++, Slot++, Dist += (1 << BitLength))
-                {
-                    DDecode[Slot] = Dist;
-                    DBits[Slot] = (byte)BitLength;
-                }
-            }
-        }
-
-        FileExtracted = true;
-
-        if (!suspended)
-        {
-            UnpInitData(solid);
-            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return;
-            }
-            if ((!solid || !tablesRead) && !ReadTables())
-            {
-                return;
-            }
-        }
-
-        if (ppmError)
-        {
-            return;
-        }
-
-        while (true)
-        {
-            unpPtr &= PackDef.MAXWINMASK;
-
-            if (inAddr > readBorder)
-            {
-                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-            }
-
-            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 260 && wrPtr != unpPtr)
-            {
-                await UnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-                if (destUnpSize < 0)
-                {
-                    return;
-                }
-                if (suspended)
-                {
-                    FileExtracted = false;
-                    return;
-                }
-            }
-            if (unpBlockType == BlockTypes.BLOCK_PPM)
-            {
-                var ch = ppm.DecodeChar();
-                if (ch == -1)
-                {
-                    ppmError = true;
-                    break;
-                }
-                if (ch == PpmEscChar)
-                {
-                    var nextCh = ppm.DecodeChar();
-                    if (nextCh == 0)
-                    {
-                        if (!ReadTables())
-                        {
-                            break;
-                        }
-                        continue;
-                    }
-                    if (nextCh == 2 || nextCh == -1)
-                    {
-                        break;
-                    }
-                    if (nextCh == 3)
-                    {
-                        if (!ReadVMCode())
-                        {
-                            break;
-                        }
-                        continue;
-                    }
-                    if (nextCh == 4)
-                    {
-                        uint Distance = 0,
-                            Length = 0;
-                        var failed = false;
-                        for (var I = 0; I < 4 && !failed; I++)
-                        {
-                            var ch2 = ppm.DecodeChar();
-                            if (ch2 == -1)
-                            {
-                                failed = true;
-                            }
-                            else if (I == 3)
-                            {
-                                Length = (uint)ch2;
-                            }
-                            else
-                            {
-                                Distance = (Distance << 8) + (uint)ch2;
-                            }
-                        }
-                        if (failed)
-                        {
-                            break;
-                        }
-
-                        CopyString(Length + 32, Distance + 2);
-                        continue;
-                    }
-                    if (nextCh == 5)
-                    {
-                        var length = ppm.DecodeChar();
-                        if (length == -1)
-                        {
-                            break;
-                        }
-                        CopyString((uint)(length + 4), 1);
-                        continue;
-                    }
-                }
-                window[unpPtr++] = (byte)ch;
-                continue;
-            }
-
-            var Number = this.decodeNumber(LD);
-            if (Number < 256)
-            {
-                window[unpPtr++] = (byte)Number;
-                continue;
-            }
-            if (Number >= 271)
-            {
-                var Length = LDecode[Number -= 271] + 3;
-                if ((Bits = LBits[Number]) > 0)
-                {
-                    Length += GetBits() >> (16 - Bits);
-                    AddBits(Bits);
-                }
-
-                var DistNumber = this.decodeNumber(DD);
-                var Distance = DDecode[DistNumber] + 1;
-                if ((Bits = DBits[DistNumber]) > 0)
-                {
-                    if (DistNumber > 9)
-                    {
-                        if (Bits > 4)
-                        {
-                            Distance += (GetBits() >> (20 - Bits)) << 4;
-                            AddBits(Bits - 4);
-                        }
-                        if (lowDistRepCount > 0)
-                        {
-                            lowDistRepCount--;
-                            Distance += prevLowDist;
-                        }
-                        else
-                        {
-                            var LowDist = this.decodeNumber(LDD);
-                            if (LowDist == 16)
-                            {
-                                lowDistRepCount = PackDef.LOW_DIST_REP_COUNT - 1;
-                                Distance += prevLowDist;
-                            }
-                            else
-                            {
-                                Distance += LowDist;
-                                prevLowDist = (int)LowDist;
-                            }
-                        }
-                    }
-                    else
-                    {
-                        Distance += GetBits() >> (16 - Bits);
-                        AddBits(Bits);
-                    }
-                }
-
-                if (Distance >= 0x2000)
-                {
-                    Length++;
-                    if (Distance >= 0x40000)
-                    {
-                        Length++;
-                    }
-                }
-
-                InsertOldDist(Distance);
-                lastLength = Length;
-                CopyString(Length, Distance);
-                continue;
-            }
-            if (Number == 256)
-            {
-                if (!ReadEndOfBlock())
-                {
-                    break;
-                }
-                continue;
-            }
-            if (Number == 257)
-            {
-                if (!ReadVMCode())
-                {
-                    break;
-                }
-                continue;
-            }
-            if (Number == 258)
-            {
-                if (lastLength != 0)
-                {
-                    CopyString(lastLength, oldDist[0]);
-                }
-
-                continue;
-            }
-            if (Number < 263)
-            {
-                var DistNum = Number - 259;
-                var Distance = (uint)oldDist[DistNum];
-                for (var I = DistNum; I > 0; I--)
-                {
-                    oldDist[I] = oldDist[I - 1];
-                }
-                oldDist[0] = (int)Distance;
-
-                var LengthNumber = this.decodeNumber(RD);
-                var Length = LDecode[LengthNumber] + 2;
-                if ((Bits = LBits[LengthNumber]) > 0)
-                {
-                    Length += GetBits() >> (16 - Bits);
-                    AddBits(Bits);
-                }
-                lastLength = Length;
-                CopyString((uint)Length, Distance);
-                continue;
-            }
-            if (Number < 272)
-            {
-                var Distance = SDDecode[Number -= 263] + 1;
-                if ((Bits = SDBits[Number]) > 0)
-                {
-                    Distance += GetBits() >> (16 - Bits);
-                    AddBits(Bits);
-                }
-                InsertOldDist((uint)Distance);
-                lastLength = 2;
-                CopyString(2, (uint)Distance);
-            }
-        }
-        await UnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-    }
-
     private void UnpWriteBuf()
     {
         var WrittenBorder = wrPtr;
@@ -1684,256 +1334,6 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         }
     }
 
-    private async System.Threading.Tasks.Task UnpWriteBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var WrittenBorder = wrPtr;
-        var WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
-        for (var I = 0; I < prgStack.Count; I++)
-        {
-            var flt = prgStack[I];
-            if (flt is null)
-            {
-                continue;
-            }
-            if (flt.NextWindow)
-            {
-                flt.NextWindow = false;
-                continue;
-            }
-            var BlockStart = flt.BlockStart;
-            var BlockLength = flt.BlockLength;
-            if (((BlockStart - WrittenBorder) & PackDef.MAXWINMASK) < WriteSize)
-            {
-                if (WrittenBorder != BlockStart)
-                {
-                    await UnpWriteAreaAsync(WrittenBorder, BlockStart, cancellationToken)
-                        .ConfigureAwait(false);
-                    WrittenBorder = BlockStart;
-                    WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
-                }
-                if (BlockLength <= WriteSize)
-                {
-                    var BlockEnd = (BlockStart + BlockLength) & PackDef.MAXWINMASK;
-                    if (BlockStart < BlockEnd || BlockEnd == 0)
-                    {
-                        rarVM.setMemory(0, window, BlockStart, BlockLength);
-                    }
-                    else
-                    {
-                        var FirstPartLength = PackDef.MAXWINSIZE - BlockStart;
-                        rarVM.setMemory(0, window, BlockStart, FirstPartLength);
-                        rarVM.setMemory(FirstPartLength, window, 0, BlockEnd);
-                    }
-
-                    var ParentPrg = filters[flt.ParentFilter].Program;
-                    var Prg = flt.Program;
-
-                    if (ParentPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
-                    {
-                        Prg.GlobalData.Clear();
-                        for (
-                            var i = 0;
-                            i < ParentPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
-                            i++
-                        )
-                        {
-                            Prg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] = ParentPrg.GlobalData[
-                                RarVM.VM_FIXEDGLOBALSIZE + i
-                            ];
-                        }
-                    }
-
-                    ExecuteCode(Prg);
-
-                    if (Prg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
-                    {
-                        if (ParentPrg.GlobalData.Count < Prg.GlobalData.Count)
-                        {
-                            ParentPrg.GlobalData.SetSize(Prg.GlobalData.Count);
-                        }
-
-                        for (var i = 0; i < Prg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE; i++)
-                        {
-                            ParentPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] = Prg.GlobalData[
-                                RarVM.VM_FIXEDGLOBALSIZE + i
-                            ];
-                        }
-                    }
-                    else
-                    {
-                        ParentPrg.GlobalData.Clear();
-                    }
-
-                    var FilteredDataOffset = Prg.FilteredDataOffset;
-                    var FilteredDataSize = Prg.FilteredDataSize;
-                    var FilteredData = ArrayPool<byte>.Shared.Rent(FilteredDataSize);
-                    try
-                    {
-                        Array.Copy(
-                            rarVM.Mem,
-                            FilteredDataOffset,
-                            FilteredData,
-                            0,
-                            FilteredDataSize
-                        );
-
-                        prgStack[I] = null;
-                        while (I + 1 < prgStack.Count)
-                        {
-                            var NextFilter = prgStack[I + 1];
-                            if (
-                                NextFilter is null
-                                || NextFilter.BlockStart != BlockStart
-                                || NextFilter.BlockLength != FilteredDataSize
-                                || NextFilter.NextWindow
-                            )
-                            {
-                                break;
-                            }
-
-                            rarVM.setMemory(0, FilteredData, 0, FilteredDataSize);
-
-                            var pPrg = filters[NextFilter.ParentFilter].Program;
-                            var NextPrg = NextFilter.Program;
-
-                            if (pPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
-                            {
-                                NextPrg.GlobalData.SetSize(pPrg.GlobalData.Count);
-
-                                for (
-                                    var i = 0;
-                                    i < pPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
-                                    i++
-                                )
-                                {
-                                    NextPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] =
-                                        pPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i];
-                                }
-                            }
-
-                            ExecuteCode(NextPrg);
-
-                            if (NextPrg.GlobalData.Count > RarVM.VM_FIXEDGLOBALSIZE)
-                            {
-                                if (pPrg.GlobalData.Count < NextPrg.GlobalData.Count)
-                                {
-                                    pPrg.GlobalData.SetSize(NextPrg.GlobalData.Count);
-                                }
-
-                                for (
-                                    var i = 0;
-                                    i < NextPrg.GlobalData.Count - RarVM.VM_FIXEDGLOBALSIZE;
-                                    i++
-                                )
-                                {
-                                    pPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i] =
-                                        NextPrg.GlobalData[RarVM.VM_FIXEDGLOBALSIZE + i];
-                                }
-                            }
-                            else
-                            {
-                                pPrg.GlobalData.Clear();
-                            }
-
-                            FilteredDataOffset = NextPrg.FilteredDataOffset;
-                            FilteredDataSize = NextPrg.FilteredDataSize;
-                            if (FilteredData.Length < FilteredDataSize)
-                            {
-                                ArrayPool<byte>.Shared.Return(FilteredData);
-                                FilteredData = ArrayPool<byte>.Shared.Rent(FilteredDataSize);
-                            }
-                            for (var i = 0; i < FilteredDataSize; i++)
-                            {
-                                FilteredData[i] = NextPrg.GlobalData[FilteredDataOffset + i];
-                            }
-
-                            I++;
-                            prgStack[I] = null;
-                        }
-
-                        await writeStream
-                            .WriteAsync(FilteredData, 0, FilteredDataSize, cancellationToken)
-                            .ConfigureAwait(false);
-                        writtenFileSize += FilteredDataSize;
-                        destUnpSize -= FilteredDataSize;
-                        WrittenBorder = BlockEnd;
-                        WriteSize = (unpPtr - WrittenBorder) & PackDef.MAXWINMASK;
-                    }
-                    finally
-                    {
-                        ArrayPool<byte>.Shared.Return(FilteredData);
-                    }
-                }
-                else
-                {
-                    for (var J = I; J < prgStack.Count; J++)
-                    {
-                        var filt = prgStack[J];
-                        if (filt != null && filt.NextWindow)
-                        {
-                            filt.NextWindow = false;
-                        }
-                    }
-                    wrPtr = WrittenBorder;
-                    return;
-                }
-            }
-        }
-
-        await UnpWriteAreaAsync(WrittenBorder, unpPtr, cancellationToken).ConfigureAwait(false);
-        wrPtr = unpPtr;
-    }
-
-    private async System.Threading.Tasks.Task UnpWriteAreaAsync(
-        int startPtr,
-        int endPtr,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (endPtr < startPtr)
-        {
-            await UnpWriteDataAsync(
-                    window,
-                    startPtr,
-                    -startPtr & PackDef.MAXWINMASK,
-                    cancellationToken
-                )
-                .ConfigureAwait(false);
-            await UnpWriteDataAsync(window, 0, endPtr, cancellationToken).ConfigureAwait(false);
-        }
-        else
-        {
-            await UnpWriteDataAsync(window, startPtr, endPtr - startPtr, cancellationToken)
-                .ConfigureAwait(false);
-        }
-    }
-
-    private async System.Threading.Tasks.Task UnpWriteDataAsync(
-        byte[] data,
-        int offset,
-        int size,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (destUnpSize < 0)
-        {
-            return;
-        }
-        var writeSize = size;
-        if (writeSize > destUnpSize)
-        {
-            writeSize = (int)destUnpSize;
-        }
-        await writeStream
-            .WriteAsync(data, offset, writeSize, cancellationToken)
-            .ConfigureAwait(false);
-
-        writtenFileSize += size;
-        destUnpSize -= size;
-    }
-
     private void CleanUp()
     {
         if (ppm != null)

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack15.Async.cs

@@ -0,0 +1,162 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Compressors.Rar.UnpackV1.Decode;
+
+namespace SharpCompress.Compressors.Rar.UnpackV1;
+
+internal partial class Unpack
+{
+    private async Task unpack15Async(bool solid, CancellationToken cancellationToken = default)
+    {
+        if (suspended)
+        {
+            unpPtr = wrPtr;
+        }
+        else
+        {
+            UnpInitData(solid);
+            oldUnpInitData(solid);
+            await unpReadBufAsync(cancellationToken).ConfigureAwait(false);
+            if (!solid)
+            {
+                initHuff();
+                unpPtr = 0;
+            }
+            else
+            {
+                unpPtr = wrPtr;
+            }
+            --destUnpSize;
+        }
+        if (destUnpSize >= 0)
+        {
+            getFlagsBuf();
+            FlagsCnt = 8;
+        }
+
+        while (destUnpSize >= 0)
+        {
+            unpPtr &= PackDef.MAXWINMASK;
+
+            if (
+                inAddr > readTop - 30
+                && !await unpReadBufAsync(cancellationToken).ConfigureAwait(false)
+            )
+            {
+                break;
+            }
+            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 270 && wrPtr != unpPtr)
+            {
+                oldUnpWriteBuf();
+                if (suspended)
+                {
+                    return;
+                }
+            }
+            if (StMode != 0)
+            {
+                huffDecode();
+                continue;
+            }
+
+            if (--FlagsCnt < 0)
+            {
+                getFlagsBuf();
+                FlagsCnt = 7;
+            }
+
+            if ((FlagBuf & 0x80) != 0)
+            {
+                FlagBuf <<= 1;
+                if (Nlzb > Nhfb)
+                {
+                    longLZ();
+                }
+                else
+                {
+                    huffDecode();
+                }
+            }
+            else
+            {
+                FlagBuf <<= 1;
+                if (--FlagsCnt < 0)
+                {
+                    getFlagsBuf();
+                    FlagsCnt = 7;
+                }
+                if ((FlagBuf & 0x80) != 0)
+                {
+                    FlagBuf <<= 1;
+                    if (Nlzb > Nhfb)
+                    {
+                        huffDecode();
+                    }
+                    else
+                    {
+                        longLZ();
+                    }
+                }
+                else
+                {
+                    FlagBuf <<= 1;
+                    shortLZ();
+                }
+            }
+        }
+        oldUnpWriteBuf();
+    }
+
+    private async Task<bool> unpReadBufAsync(CancellationToken cancellationToken = default)
+    {
+        var dataSize = readTop - inAddr;
+        if (dataSize < 0)
+        {
+            return false;
+        }
+        if (inAddr > MAX_SIZE / 2)
+        {
+            if (dataSize > 0)
+            {
+                Array.Copy(InBuf, inAddr, InBuf, 0, dataSize);
+            }
+            inAddr = 0;
+            readTop = dataSize;
+        }
+        else
+        {
+            dataSize = readTop;
+        }
+
+        var readCode = await readStream
+            .ReadAsync(InBuf, dataSize, (MAX_SIZE - dataSize) & ~0xf, cancellationToken)
+            .ConfigureAwait(false);
+        if (readCode > 0)
+        {
+            readTop += readCode;
+        }
+        readBorder = readTop - 30;
+        return readCode != -1;
+    }
+
+    private async Task oldUnpWriteBufAsync(CancellationToken cancellationToken = default)
+    {
+        if (unpPtr < wrPtr)
+        {
+            await writeStream
+                .WriteAsync(window, wrPtr, -wrPtr & PackDef.MAXWINMASK, cancellationToken)
+                .ConfigureAwait(false);
+            await writeStream
+                .WriteAsync(window, 0, unpPtr, cancellationToken)
+                .ConfigureAwait(false);
+        }
+        else
+        {
+            await writeStream
+                .WriteAsync(window, wrPtr, unpPtr - wrPtr, cancellationToken)
+                .ConfigureAwait(false);
+        }
+        wrPtr = unpPtr;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack15.cs

@@ -316,110 +316,6 @@ internal partial class Unpack
         oldUnpWriteBuf();
     }
 
-    private async System.Threading.Tasks.Task unpack15Async(
-        bool solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (suspended)
-        {
-            unpPtr = wrPtr;
-        }
-        else
-        {
-            UnpInitData(solid);
-            oldUnpInitData(solid);
-            await unpReadBufAsync(cancellationToken).ConfigureAwait(false);
-            if (!solid)
-            {
-                initHuff();
-                unpPtr = 0;
-            }
-            else
-            {
-                unpPtr = wrPtr;
-            }
-            --destUnpSize;
-        }
-        if (destUnpSize >= 0)
-        {
-            getFlagsBuf();
-            FlagsCnt = 8;
-        }
-
-        while (destUnpSize >= 0)
-        {
-            unpPtr &= PackDef.MAXWINMASK;
-
-            if (
-                inAddr > readTop - 30
-                && !await unpReadBufAsync(cancellationToken).ConfigureAwait(false)
-            )
-            {
-                break;
-            }
-            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 270 && wrPtr != unpPtr)
-            {
-                await oldUnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-                if (suspended)
-                {
-                    return;
-                }
-            }
-            if (StMode != 0)
-            {
-                huffDecode();
-                continue;
-            }
-
-            if (--FlagsCnt < 0)
-            {
-                getFlagsBuf();
-                FlagsCnt = 7;
-            }
-
-            if ((FlagBuf & 0x80) != 0)
-            {
-                FlagBuf <<= 1;
-                if (Nlzb > Nhfb)
-                {
-                    longLZ();
-                }
-                else
-                {
-                    huffDecode();
-                }
-            }
-            else
-            {
-                FlagBuf <<= 1;
-                if (--FlagsCnt < 0)
-                {
-                    getFlagsBuf();
-                    FlagsCnt = 7;
-                }
-                if ((FlagBuf & 0x80) != 0)
-                {
-                    FlagBuf <<= 1;
-                    if (Nlzb > Nhfb)
-                    {
-                        huffDecode();
-                    }
-                    else
-                    {
-                        longLZ();
-                    }
-                }
-                else
-                {
-                    FlagBuf <<= 1;
-                    shortLZ();
-                }
-            }
-        }
-        await oldUnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-    }
-
     private bool unpReadBuf()
     {
         var dataSize = readTop - inAddr;
@@ -455,40 +351,6 @@ internal partial class Unpack
         return (readCode != -1);
     }
 
-    private async System.Threading.Tasks.Task<bool> unpReadBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var dataSize = readTop - inAddr;
-        if (dataSize < 0)
-        {
-            return (false);
-        }
-        if (inAddr > MAX_SIZE / 2)
-        {
-            if (dataSize > 0)
-            {
-                Array.Copy(InBuf, inAddr, InBuf, 0, dataSize);
-            }
-            inAddr = 0;
-            readTop = dataSize;
-        }
-        else
-        {
-            dataSize = readTop;
-        }
-
-        var readCode = await readStream
-            .ReadAsync(InBuf, dataSize, (MAX_SIZE - dataSize) & ~0xf, cancellationToken)
-            .ConfigureAwait(false);
-        if (readCode > 0)
-        {
-            readTop += readCode;
-        }
-        readBorder = readTop - 30;
-        return (readCode != -1);
-    }
-
     private int getShortLen1(int pos) => pos == 1 ? Buf60 + 3 : ShortLen1[pos];
 
     private int getShortLen2(int pos) => pos == 3 ? Buf60 + 3 : ShortLen2[pos];
@@ -952,26 +814,4 @@ internal partial class Unpack
         }
         wrPtr = unpPtr;
     }
-
-    private async System.Threading.Tasks.Task oldUnpWriteBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (unpPtr < wrPtr)
-        {
-            await writeStream
-                .WriteAsync(window, wrPtr, -wrPtr & PackDef.MAXWINMASK, cancellationToken)
-                .ConfigureAwait(false);
-            await writeStream
-                .WriteAsync(window, 0, unpPtr, cancellationToken)
-                .ConfigureAwait(false);
-        }
-        else
-        {
-            await writeStream
-                .WriteAsync(window, wrPtr, unpPtr - wrPtr, cancellationToken)
-                .ConfigureAwait(false);
-        }
-        wrPtr = unpPtr;
-    }
 }

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack20.Async.cs

@@ -0,0 +1,275 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Compressors.Rar.UnpackV1.Decode;
+
+namespace SharpCompress.Compressors.Rar.UnpackV1;
+
+internal partial class Unpack
+{
+    private async Task unpack20Async(bool solid, CancellationToken cancellationToken = default)
+    {
+        int Bits;
+
+        if (suspended)
+        {
+            unpPtr = wrPtr;
+        }
+        else
+        {
+            UnpInitData(solid);
+            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return;
+            }
+            if (!solid)
+            {
+                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
+                {
+                    return;
+                }
+            }
+            --destUnpSize;
+        }
+
+        while (destUnpSize >= 0)
+        {
+            unpPtr &= PackDef.MAXWINMASK;
+
+            if (inAddr > readTop - 30)
+            {
+                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+            }
+            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 270 && wrPtr != unpPtr)
+            {
+                oldUnpWriteBuf();
+                if (suspended)
+                {
+                    return;
+                }
+            }
+            if (UnpAudioBlock != 0)
+            {
+                var AudioNumber = this.decodeNumber(MD[UnpCurChannel]);
+
+                if (AudioNumber == 256)
+                {
+                    if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
+                    {
+                        break;
+                    }
+                    continue;
+                }
+                window[unpPtr++] = DecodeAudio(AudioNumber);
+                if (++UnpCurChannel == UnpChannels)
+                {
+                    UnpCurChannel = 0;
+                }
+                --destUnpSize;
+                continue;
+            }
+
+            var Number = this.decodeNumber(LD);
+            if (Number < 256)
+            {
+                window[unpPtr++] = (byte)Number;
+                --destUnpSize;
+                continue;
+            }
+            if (Number > 269)
+            {
+                var Length = LDecode[Number -= 270] + 3;
+                if ((Bits = LBits[Number]) > 0)
+                {
+                    Length += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+
+                var DistNumber = this.decodeNumber(DD);
+                var Distance = DDecode[DistNumber] + 1;
+                if ((Bits = DBits[DistNumber]) > 0)
+                {
+                    Distance += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+
+                if (Distance >= 0x2000)
+                {
+                    Length++;
+                    if (Distance >= 0x40000L)
+                    {
+                        Length++;
+                    }
+                }
+
+                CopyString20(Length, Distance);
+                continue;
+            }
+            if (Number == 269)
+            {
+                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+                continue;
+            }
+            if (Number == 256)
+            {
+                CopyString20(lastLength, lastDist);
+                continue;
+            }
+            if (Number < 261)
+            {
+                var Distance = oldDist[(oldDistPtr - (Number - 256)) & 3];
+                var LengthNumber = this.decodeNumber(RD);
+                var Length = LDecode[LengthNumber] + 2;
+                if ((Bits = LBits[LengthNumber]) > 0)
+                {
+                    Length += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+                if (Distance >= 0x101)
+                {
+                    Length++;
+                    if (Distance >= 0x2000)
+                    {
+                        Length++;
+                        if (Distance >= 0x40000)
+                        {
+                            Length++;
+                        }
+                    }
+                }
+                CopyString20(Length, Distance);
+                continue;
+            }
+            if (Number < 270)
+            {
+                var Distance = SDDecode[Number -= 261] + 1;
+                if ((Bits = SDBits[Number]) > 0)
+                {
+                    Distance += Utility.URShift(GetBits(), (16 - Bits));
+                    AddBits(Bits);
+                }
+                CopyString20(2, Distance);
+            }
+        }
+        ReadLastTables();
+        oldUnpWriteBuf();
+    }
+
+    private async Task<bool> ReadTables20Async(CancellationToken cancellationToken = default)
+    {
+        byte[] BitLength = new byte[PackDef.BC20];
+        byte[] Table = new byte[PackDef.MC20 * 4];
+        int TableSize,
+            N,
+            I;
+        if (inAddr > readTop - 25)
+        {
+            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+        var BitField = GetBits();
+        UnpAudioBlock = (BitField & 0x8000);
+
+        if (0 == (BitField & 0x4000))
+        {
+            new Span<byte>(UnpOldTable20).Clear();
+        }
+        AddBits(2);
+
+        if (UnpAudioBlock != 0)
+        {
+            UnpChannels = ((Utility.URShift(BitField, 12)) & 3) + 1;
+            if (UnpCurChannel >= UnpChannels)
+            {
+                UnpCurChannel = 0;
+            }
+            AddBits(2);
+            TableSize = PackDef.MC20 * UnpChannels;
+        }
+        else
+        {
+            TableSize = PackDef.NC20 + PackDef.DC20 + PackDef.RC20;
+        }
+        for (I = 0; I < PackDef.BC20; I++)
+        {
+            BitLength[I] = (byte)(Utility.URShift(GetBits(), 12));
+            AddBits(4);
+        }
+        UnpackUtility.makeDecodeTables(BitLength, 0, BD, PackDef.BC20);
+        I = 0;
+        while (I < TableSize)
+        {
+            if (inAddr > readTop - 5)
+            {
+                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    return false;
+                }
+            }
+            var Number = this.decodeNumber(BD);
+            if (Number < 16)
+            {
+                Table[I] = (byte)((Number + UnpOldTable20[I]) & 0xf);
+                I++;
+            }
+            else if (Number == 16)
+            {
+                N = (Utility.URShift(GetBits(), 14)) + 3;
+                AddBits(2);
+                while (N-- > 0 && I < TableSize)
+                {
+                    Table[I] = Table[I - 1];
+                    I++;
+                }
+            }
+            else
+            {
+                if (Number == 17)
+                {
+                    N = (Utility.URShift(GetBits(), 13)) + 3;
+                    AddBits(3);
+                }
+                else
+                {
+                    N = (Utility.URShift(GetBits(), 9)) + 11;
+                    AddBits(7);
+                }
+                while (N-- > 0 && I < TableSize)
+                {
+                    Table[I++] = 0;
+                }
+            }
+        }
+        if (inAddr > readTop)
+        {
+            return true;
+        }
+        if (UnpAudioBlock != 0)
+        {
+            for (I = 0; I < UnpChannels; I++)
+            {
+                UnpackUtility.makeDecodeTables(Table, I * PackDef.MC20, MD[I], PackDef.MC20);
+            }
+        }
+        else
+        {
+            UnpackUtility.makeDecodeTables(Table, 0, LD, PackDef.NC20);
+            UnpackUtility.makeDecodeTables(Table, PackDef.NC20, DD, PackDef.DC20);
+            UnpackUtility.makeDecodeTables(Table, PackDef.NC20 + PackDef.DC20, RD, PackDef.RC20);
+        }
+
+        for (var i = 0; i < UnpOldTable20.Length; i++)
+        {
+            UnpOldTable20[i] = Table[i];
+        }
+        return true;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack20.cs

@@ -368,163 +368,6 @@ internal partial class Unpack
         oldUnpWriteBuf();
     }
 
-    private async System.Threading.Tasks.Task unpack20Async(
-        bool solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        int Bits;
-
-        if (suspended)
-        {
-            unpPtr = wrPtr;
-        }
-        else
-        {
-            UnpInitData(solid);
-            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return;
-            }
-            if (!solid)
-            {
-                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
-                {
-                    return;
-                }
-            }
-            --destUnpSize;
-        }
-
-        while (destUnpSize >= 0)
-        {
-            unpPtr &= PackDef.MAXWINMASK;
-
-            if (inAddr > readTop - 30)
-            {
-                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-            }
-            if (((wrPtr - unpPtr) & PackDef.MAXWINMASK) < 270 && wrPtr != unpPtr)
-            {
-                await oldUnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-                if (suspended)
-                {
-                    return;
-                }
-            }
-            if (UnpAudioBlock != 0)
-            {
-                var AudioNumber = this.decodeNumber(MD[UnpCurChannel]);
-
-                if (AudioNumber == 256)
-                {
-                    if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
-                    {
-                        break;
-                    }
-                    continue;
-                }
-                window[unpPtr++] = DecodeAudio(AudioNumber);
-                if (++UnpCurChannel == UnpChannels)
-                {
-                    UnpCurChannel = 0;
-                }
-                --destUnpSize;
-                continue;
-            }
-
-            var Number = this.decodeNumber(LD);
-            if (Number < 256)
-            {
-                window[unpPtr++] = (byte)Number;
-                --destUnpSize;
-                continue;
-            }
-            if (Number > 269)
-            {
-                var Length = LDecode[Number -= 270] + 3;
-                if ((Bits = LBits[Number]) > 0)
-                {
-                    Length += Utility.URShift(GetBits(), (16 - Bits));
-                    AddBits(Bits);
-                }
-
-                var DistNumber = this.decodeNumber(DD);
-                var Distance = DDecode[DistNumber] + 1;
-                if ((Bits = DBits[DistNumber]) > 0)
-                {
-                    Distance += Utility.URShift(GetBits(), (16 - Bits));
-                    AddBits(Bits);
-                }
-
-                if (Distance >= 0x2000)
-                {
-                    Length++;
-                    if (Distance >= 0x40000L)
-                    {
-                        Length++;
-                    }
-                }
-
-                CopyString20(Length, Distance);
-                continue;
-            }
-            if (Number == 269)
-            {
-                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-                continue;
-            }
-            if (Number == 256)
-            {
-                CopyString20(lastLength, lastDist);
-                continue;
-            }
-            if (Number < 261)
-            {
-                var Distance = oldDist[(oldDistPtr - (Number - 256)) & 3];
-                var LengthNumber = this.decodeNumber(RD);
-                var Length = LDecode[LengthNumber] + 2;
-                if ((Bits = LBits[LengthNumber]) > 0)
-                {
-                    Length += Utility.URShift(GetBits(), (16 - Bits));
-                    AddBits(Bits);
-                }
-                if (Distance >= 0x101)
-                {
-                    Length++;
-                    if (Distance >= 0x2000)
-                    {
-                        Length++;
-                        if (Distance >= 0x40000)
-                        {
-                            Length++;
-                        }
-                    }
-                }
-                CopyString20(Length, Distance);
-                continue;
-            }
-            if (Number < 270)
-            {
-                var Distance = SDDecode[Number -= 261] + 1;
-                if ((Bits = SDBits[Number]) > 0)
-                {
-                    Distance += Utility.URShift(GetBits(), (16 - Bits));
-                    AddBits(Bits);
-                }
-                CopyString20(2, Distance);
-            }
-        }
-        ReadLastTables();
-        await oldUnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-    }
-
     private void CopyString20(int Length, int Distance)
     {
         lastDist = oldDist[oldDistPtr++ & 3] = Distance;
@@ -691,120 +534,6 @@ internal partial class Unpack
         return (true);
     }
 
-    private async System.Threading.Tasks.Task<bool> ReadTables20Async(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        byte[] BitLength = new byte[PackDef.BC20];
-        byte[] Table = new byte[PackDef.MC20 * 4];
-        int TableSize,
-            N,
-            I;
-        if (inAddr > readTop - 25)
-        {
-            if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return (false);
-            }
-        }
-        var BitField = GetBits();
-        UnpAudioBlock = (BitField & 0x8000);
-
-        if (0 == (BitField & 0x4000))
-        {
-            new Span<byte>(UnpOldTable20).Clear();
-        }
-        AddBits(2);
-
-        if (UnpAudioBlock != 0)
-        {
-            UnpChannels = ((Utility.URShift(BitField, 12)) & 3) + 1;
-            if (UnpCurChannel >= UnpChannels)
-            {
-                UnpCurChannel = 0;
-            }
-            AddBits(2);
-            TableSize = PackDef.MC20 * UnpChannels;
-        }
-        else
-        {
-            TableSize = PackDef.NC20 + PackDef.DC20 + PackDef.RC20;
-        }
-        for (I = 0; I < PackDef.BC20; I++)
-        {
-            BitLength[I] = (byte)(Utility.URShift(GetBits(), 12));
-            AddBits(4);
-        }
-        UnpackUtility.makeDecodeTables(BitLength, 0, BD, PackDef.BC20);
-        I = 0;
-        while (I < TableSize)
-        {
-            if (inAddr > readTop - 5)
-            {
-                if (!await unpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    return (false);
-                }
-            }
-            var Number = this.decodeNumber(BD);
-            if (Number < 16)
-            {
-                Table[I] = (byte)((Number + UnpOldTable20[I]) & 0xf);
-                I++;
-            }
-            else if (Number == 16)
-            {
-                N = (Utility.URShift(GetBits(), 14)) + 3;
-                AddBits(2);
-                while (N-- > 0 && I < TableSize)
-                {
-                    Table[I] = Table[I - 1];
-                    I++;
-                }
-            }
-            else
-            {
-                if (Number == 17)
-                {
-                    N = (Utility.URShift(GetBits(), 13)) + 3;
-                    AddBits(3);
-                }
-                else
-                {
-                    N = (Utility.URShift(GetBits(), 9)) + 11;
-                    AddBits(7);
-                }
-                while (N-- > 0 && I < TableSize)
-                {
-                    Table[I++] = 0;
-                }
-            }
-        }
-        if (inAddr > readTop)
-        {
-            return (true);
-        }
-        if (UnpAudioBlock != 0)
-        {
-            for (I = 0; I < UnpChannels; I++)
-            {
-                UnpackUtility.makeDecodeTables(Table, I * PackDef.MC20, MD[I], PackDef.MC20);
-            }
-        }
-        else
-        {
-            UnpackUtility.makeDecodeTables(Table, 0, LD, PackDef.NC20);
-            UnpackUtility.makeDecodeTables(Table, PackDef.NC20, DD, PackDef.DC20);
-            UnpackUtility.makeDecodeTables(Table, PackDef.NC20 + PackDef.DC20, RD, PackDef.RC20);
-        }
-
-        for (var i = 0; i < UnpOldTable20.Length; i++)
-        {
-            UnpOldTable20[i] = Table[i];
-        }
-        return (true);
-    }
-
     private void unpInitData20(bool Solid)
     {
         if (!Solid)

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack50.Async.cs

@@ -0,0 +1,321 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Compressors.Rar.UnpackV1.Decode;
+
+namespace SharpCompress.Compressors.Rar.UnpackV1;
+
+internal partial class Unpack
+{
+    private async Task<bool> UnpReadBufAsync(CancellationToken cancellationToken = default)
+    {
+        var DataSize = ReadTop - Inp.InAddr; // Data left to process.
+        if (DataSize < 0)
+        {
+            return false;
+        }
+
+        BlockHeader.BlockSize -= Inp.InAddr - BlockHeader.BlockStart;
+        if (Inp.InAddr > MAX_SIZE / 2)
+        {
+            if (DataSize > 0)
+            {
+                Array.Copy(InBuf, inAddr, InBuf, 0, DataSize);
+            }
+
+            Inp.InAddr = 0;
+            ReadTop = DataSize;
+        }
+        else
+        {
+            DataSize = ReadTop;
+        }
+
+        var ReadCode = 0;
+        if (MAX_SIZE != DataSize)
+        {
+            ReadCode = await readStream
+                .ReadAsync(InBuf, DataSize, MAX_SIZE - DataSize, cancellationToken)
+                .ConfigureAwait(false);
+        }
+
+        if (ReadCode > 0) // Can be also -1.
+        {
+            ReadTop += ReadCode;
+        }
+
+        ReadBorder = ReadTop - 30;
+        BlockHeader.BlockStart = Inp.InAddr;
+        if (BlockHeader.BlockSize != -1) // '-1' means not defined yet.
+        {
+            ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
+        }
+        return ReadCode != -1;
+    }
+
+    public async Task Unpack5Async(bool Solid, CancellationToken cancellationToken = default)
+    {
+        FileExtracted = true;
+
+        if (!Suspended)
+        {
+            UnpInitData(Solid);
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return;
+            }
+
+            // Check TablesRead5 to be sure that we read tables at least once
+            // regardless of current block header TablePresent flag.
+            // So we can safefly use these tables below.
+            if (
+                !await ReadBlockHeaderAsync(cancellationToken).ConfigureAwait(false)
+                || !ReadTables()
+                || !TablesRead5
+            )
+            {
+                return;
+            }
+        }
+
+        while (true)
+        {
+            UnpPtr &= MaxWinMask;
+
+            if (Inp.InAddr >= ReadBorder)
+            {
+                var FileDone = false;
+
+                // We use 'while', because for empty block containing only Huffman table,
+                // we'll be on the block border once again just after reading the table.
+                while (
+                    Inp.InAddr > BlockHeader.BlockStart + BlockHeader.BlockSize - 1
+                    || Inp.InAddr == BlockHeader.BlockStart + BlockHeader.BlockSize - 1
+                        && Inp.InBit >= BlockHeader.BlockBitSize
+                )
+                {
+                    if (BlockHeader.LastBlockInFile)
+                    {
+                        FileDone = true;
+                        break;
+                    }
+                    if (
+                        !await ReadBlockHeaderAsync(cancellationToken).ConfigureAwait(false)
+                        || !ReadTables()
+                    )
+                    {
+                        return;
+                    }
+                }
+                if (FileDone || !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+            }
+
+            if (
+                ((WriteBorder - UnpPtr) & MaxWinMask) < PackDef.MAX_LZ_MATCH + 3
+                && WriteBorder != UnpPtr
+            )
+            {
+                UnpWriteBuf();
+                if (WrittenFileSize > DestUnpSize)
+                {
+                    return;
+                }
+
+                if (Suspended)
+                {
+                    FileExtracted = false;
+                    return;
+                }
+            }
+
+            var MainSlot = this.DecodeNumber(LD);
+            if (MainSlot < 256)
+            {
+                Window[UnpPtr++] = (byte)MainSlot;
+                continue;
+            }
+            if (MainSlot >= 262)
+            {
+                var Length = SlotToLength(MainSlot - 262);
+
+                int DBits;
+                uint Distance = 1,
+                    DistSlot = this.DecodeNumber(DD);
+                if (DistSlot < 4)
+                {
+                    DBits = 0;
+                    Distance += DistSlot;
+                }
+                else
+                {
+                    DBits = (int)((DistSlot / 2) - 1);
+                    Distance += (2 | (DistSlot & 1)) << DBits;
+                }
+
+                if (DBits > 0)
+                {
+                    if (DBits >= 4)
+                    {
+                        if (DBits > 4)
+                        {
+                            Distance += ((Inp.getbits() >> (36 - DBits)) << 4);
+                            Inp.AddBits(DBits - 4);
+                        }
+                        var LowDist = this.DecodeNumber(LDD);
+                        Distance += LowDist;
+                    }
+                    else
+                    {
+                        Distance += Inp.getbits() >> (32 - DBits);
+                        Inp.AddBits(DBits);
+                    }
+                }
+
+                if (Distance > 0x100)
+                {
+                    Length++;
+                    if (Distance > 0x2000)
+                    {
+                        Length++;
+                        if (Distance > 0x40000)
+                        {
+                            Length++;
+                        }
+                    }
+                }
+
+                InsertOldDist(Distance);
+                LastLength = Length;
+                CopyString(Length, Distance);
+                continue;
+            }
+            if (MainSlot == 256)
+            {
+                var Filter = new UnpackFilter();
+                if (
+                    !await ReadFilterAsync(Filter, cancellationToken).ConfigureAwait(false)
+                    || !AddFilter(Filter)
+                )
+                {
+                    break;
+                }
+
+                continue;
+            }
+            if (MainSlot == 257)
+            {
+                if (LastLength != 0)
+                {
+                    CopyString(LastLength, OldDistN(0));
+                }
+
+                continue;
+            }
+            if (MainSlot < 262)
+            {
+                var DistNum = (int)(MainSlot - 258);
+                var Distance = OldDistN(DistNum);
+                for (var I = DistNum; I > 0; I--)
+                {
+                    SetOldDistN(I, OldDistN(I - 1));
+                }
+
+                SetOldDistN(0, Distance);
+
+                var LengthSlot = this.DecodeNumber(RD);
+                var Length = SlotToLength(LengthSlot);
+                LastLength = Length;
+                CopyString(Length, Distance);
+                continue;
+            }
+        }
+        UnpWriteBuf();
+    }
+
+    private async Task<bool> ReadBlockHeaderAsync(CancellationToken cancellationToken = default)
+    {
+        Header.HeaderSize = 0;
+
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 7)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        Inp.faddbits((uint)((8 - Inp.InBit) & 7));
+
+        var BlockFlags = (byte)(Inp.fgetbits() >> 8);
+        Inp.faddbits(8);
+        var ByteCount = (uint)(((BlockFlags >> 3) & 3) + 1);
+
+        if (ByteCount == 4)
+        {
+            return false;
+        }
+
+        Header.HeaderSize = (int)(2 + ByteCount);
+
+        Header.BlockBitSize = (BlockFlags & 7) + 1;
+
+        var SavedCheckSum = (byte)(Inp.fgetbits() >> 8);
+        Inp.faddbits(8);
+
+        var BlockSize = 0;
+        for (var I = 0; I < ByteCount; I++)
+        {
+            BlockSize += (int)(Inp.fgetbits() >> 8) << (I * 8);
+            Inp.AddBits(8);
+        }
+
+        Header.BlockSize = BlockSize;
+        var CheckSum = (byte)(0x5a ^ BlockFlags ^ BlockSize ^ (BlockSize >> 8) ^ (BlockSize >> 16));
+        if (CheckSum != SavedCheckSum)
+        {
+            return false;
+        }
+
+        Header.BlockStart = Inp.InAddr;
+        ReadBorder = Math.Min(ReadBorder, Header.BlockStart + Header.BlockSize - 1);
+
+        Header.LastBlockInFile = (BlockFlags & 0x40) != 0;
+        Header.TablePresent = (BlockFlags & 0x80) != 0;
+        return true;
+    }
+
+    private async Task<bool> ReadFilterAsync(
+        UnpackFilter Filter,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 16)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        Filter.uBlockStart = ReadFilterData();
+        Filter.uBlockLength = ReadFilterData();
+        if (Filter.BlockLength > MAX_FILTER_BLOCK_SIZE)
+        {
+            Filter.BlockLength = 0;
+        }
+
+        Filter.Type = (byte)(Inp.fgetbits() >> 13);
+        Inp.faddbits(3);
+
+        if (Filter.Type == (byte)FilterType.FILTER_DELTA)
+        {
+            Filter.Channels = (byte)((Inp.fgetbits() >> 11) + 1);
+            Inp.faddbits(5);
+        }
+
+        return true;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV1/Unpack50.cs

@@ -479,354 +479,6 @@ internal partial class Unpack
         return ReadCode != -1;
     }
 
-    private async System.Threading.Tasks.Task<bool> UnpReadBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var DataSize = ReadTop - Inp.InAddr; // Data left to process.
-        if (DataSize < 0)
-        {
-            return false;
-        }
-
-        BlockHeader.BlockSize -= Inp.InAddr - BlockHeader.BlockStart;
-        if (Inp.InAddr > MAX_SIZE / 2)
-        {
-            if (DataSize > 0)
-            {
-                Array.Copy(InBuf, inAddr, InBuf, 0, DataSize);
-            }
-
-            Inp.InAddr = 0;
-            ReadTop = DataSize;
-        }
-        else
-        {
-            DataSize = ReadTop;
-        }
-
-        var ReadCode = 0;
-        if (MAX_SIZE != DataSize)
-        {
-            ReadCode = await readStream
-                .ReadAsync(InBuf, DataSize, MAX_SIZE - DataSize, cancellationToken)
-                .ConfigureAwait(false);
-        }
-
-        if (ReadCode > 0) // Can be also -1.
-        {
-            ReadTop += ReadCode;
-        }
-
-        ReadBorder = ReadTop - 30;
-        BlockHeader.BlockStart = Inp.InAddr;
-        if (BlockHeader.BlockSize != -1) // '-1' means not defined yet.
-        {
-            ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
-        }
-        return ReadCode != -1;
-    }
-
-    public async System.Threading.Tasks.Task Unpack5Async(
-        bool Solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        FileExtracted = true;
-
-        if (!Suspended)
-        {
-            UnpInitData(Solid);
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return;
-            }
-
-            // Check TablesRead5 to be sure that we read tables at least once
-            // regardless of current block header TablePresent flag.
-            // So we can safefly use these tables below.
-            if (
-                !await ReadBlockHeaderAsync(cancellationToken).ConfigureAwait(false)
-                || !ReadTables()
-                || !TablesRead5
-            )
-            {
-                return;
-            }
-        }
-
-        while (true)
-        {
-            UnpPtr &= MaxWinMask;
-
-            if (Inp.InAddr >= ReadBorder)
-            {
-                var FileDone = false;
-
-                // We use 'while', because for empty block containing only Huffman table,
-                // we'll be on the block border once again just after reading the table.
-                while (
-                    Inp.InAddr > BlockHeader.BlockStart + BlockHeader.BlockSize - 1
-                    || Inp.InAddr == BlockHeader.BlockStart + BlockHeader.BlockSize - 1
-                        && Inp.InBit >= BlockHeader.BlockBitSize
-                )
-                {
-                    if (BlockHeader.LastBlockInFile)
-                    {
-                        FileDone = true;
-                        break;
-                    }
-                    if (
-                        !await ReadBlockHeaderAsync(cancellationToken).ConfigureAwait(false)
-                        || !ReadTables()
-                    )
-                    {
-                        return;
-                    }
-                }
-                if (FileDone || !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-            }
-
-            if (
-                ((WriteBorder - UnpPtr) & MaxWinMask) < PackDef.MAX_LZ_MATCH + 3
-                && WriteBorder != UnpPtr
-            )
-            {
-                UnpWriteBuf();
-                if (WrittenFileSize > DestUnpSize)
-                {
-                    return;
-                }
-
-                if (Suspended)
-                {
-                    FileExtracted = false;
-                    return;
-                }
-            }
-
-            //uint MainSlot=DecodeNumber(Inp,LD);
-            var MainSlot = this.DecodeNumber(LD);
-            if (MainSlot < 256)
-            {
-                //              if (Fragmented)
-                //                FragWindow[UnpPtr++]=(byte)MainSlot;
-                //              else
-                Window[UnpPtr++] = (byte)MainSlot;
-                continue;
-            }
-            if (MainSlot >= 262)
-            {
-                var Length = SlotToLength(MainSlot - 262);
-
-                //uint DBits,Distance=1,DistSlot=DecodeNumber(Inp,&BlockTables.DD);
-                int DBits;
-                uint Distance = 1,
-                    DistSlot = this.DecodeNumber(DD);
-                if (DistSlot < 4)
-                {
-                    DBits = 0;
-                    Distance += DistSlot;
-                }
-                else
-                {
-                    //DBits=DistSlot/2 - 1;
-                    DBits = (int)((DistSlot / 2) - 1);
-                    Distance += (2 | (DistSlot & 1)) << DBits;
-                }
-
-                if (DBits > 0)
-                {
-                    if (DBits >= 4)
-                    {
-                        if (DBits > 4)
-                        {
-                            Distance += ((Inp.getbits() >> (36 - DBits)) << 4);
-                            Inp.AddBits(DBits - 4);
-                        }
-                        //uint LowDist=DecodeNumber(Inp,&BlockTables.LDD);
-                        var LowDist = this.DecodeNumber(LDD);
-                        Distance += LowDist;
-                    }
-                    else
-                    {
-                        Distance += Inp.getbits() >> (32 - DBits);
-                        Inp.AddBits(DBits);
-                    }
-                }
-
-                if (Distance > 0x100)
-                {
-                    Length++;
-                    if (Distance > 0x2000)
-                    {
-                        Length++;
-                        if (Distance > 0x40000)
-                        {
-                            Length++;
-                        }
-                    }
-                }
-
-                InsertOldDist(Distance);
-                LastLength = Length;
-                //              if (Fragmented)
-                //                FragWindow.CopyString(Length,Distance,UnpPtr,MaxWinMask);
-                //              else
-                CopyString(Length, Distance);
-                continue;
-            }
-            if (MainSlot == 256)
-            {
-                var Filter = new UnpackFilter();
-                if (
-                    !await ReadFilterAsync(Filter, cancellationToken).ConfigureAwait(false)
-                    || !AddFilter(Filter)
-                )
-                {
-                    break;
-                }
-
-                continue;
-            }
-            if (MainSlot == 257)
-            {
-                if (LastLength != 0)
-                //                if (Fragmented)
-                //                  FragWindow.CopyString(LastLength,OldDist[0],UnpPtr,MaxWinMask);
-                //                else
-                //CopyString(LastLength,OldDist[0]);
-                {
-                    CopyString(LastLength, OldDistN(0));
-                }
-
-                continue;
-            }
-            if (MainSlot < 262)
-            {
-                //uint DistNum=MainSlot-258;
-                var DistNum = (int)(MainSlot - 258);
-                //uint Distance=OldDist[DistNum];
-                var Distance = OldDistN(DistNum);
-                //for (uint I=DistNum;I>0;I--)
-                for (var I = DistNum; I > 0; I--)
-                //OldDistN[I]=OldDistN(I-1);
-                {
-                    SetOldDistN(I, OldDistN(I - 1));
-                }
-
-                //OldDistN[0]=Distance;
-                SetOldDistN(0, Distance);
-
-                var LengthSlot = this.DecodeNumber(RD);
-                var Length = SlotToLength(LengthSlot);
-                LastLength = Length;
-                //              if (Fragmented)
-                //                FragWindow.CopyString(Length,Distance,UnpPtr,MaxWinMask);
-                //              else
-                CopyString(Length, Distance);
-                continue;
-            }
-        }
-        UnpWriteBuf();
-    }
-
-    private async System.Threading.Tasks.Task<bool> ReadBlockHeaderAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        Header.HeaderSize = 0;
-
-        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 7)
-        {
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return false;
-            }
-        }
-
-        //Inp.faddbits((8-Inp.InBit)&7);
-        Inp.faddbits((uint)((8 - Inp.InBit) & 7));
-
-        var BlockFlags = (byte)(Inp.fgetbits() >> 8);
-        Inp.faddbits(8);
-        //uint ByteCount=((BlockFlags>>3)&3)+1; // Block size byte count.
-        var ByteCount = (uint)(((BlockFlags >> 3) & 3) + 1); // Block size byte count.
-
-        if (ByteCount == 4)
-        {
-            return false;
-        }
-
-        //Header.HeaderSize=2+ByteCount;
-        Header.HeaderSize = (int)(2 + ByteCount);
-
-        Header.BlockBitSize = (BlockFlags & 7) + 1;
-
-        var SavedCheckSum = (byte)(Inp.fgetbits() >> 8);
-        Inp.faddbits(8);
-
-        var BlockSize = 0;
-        //for (uint I=0;I<ByteCount;I++)
-        for (var I = 0; I < ByteCount; I++)
-        {
-            //BlockSize+=(Inp.fgetbits()>>8)<<(I*8);
-            BlockSize += (int)(Inp.fgetbits() >> 8) << (I * 8);
-            Inp.AddBits(8);
-        }
-
-        Header.BlockSize = BlockSize;
-        var CheckSum = (byte)(0x5a ^ BlockFlags ^ BlockSize ^ (BlockSize >> 8) ^ (BlockSize >> 16));
-        if (CheckSum != SavedCheckSum)
-        {
-            return false;
-        }
-
-        Header.BlockStart = Inp.InAddr;
-        ReadBorder = Math.Min(ReadBorder, Header.BlockStart + Header.BlockSize - 1);
-
-        Header.LastBlockInFile = (BlockFlags & 0x40) != 0;
-        Header.TablePresent = (BlockFlags & 0x80) != 0;
-        return true;
-    }
-
-    private async System.Threading.Tasks.Task<bool> ReadFilterAsync(
-        UnpackFilter Filter,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 16)
-        {
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return false;
-            }
-        }
-
-        Filter.uBlockStart = ReadFilterData();
-        Filter.uBlockLength = ReadFilterData();
-        if (Filter.BlockLength > MAX_FILTER_BLOCK_SIZE)
-        {
-            Filter.BlockLength = 0;
-        }
-
-        //Filter.Type=Inp.fgetbits()>>13;
-        Filter.Type = (byte)(Inp.fgetbits() >> 13);
-        Inp.faddbits(3);
-
-        if (Filter.Type == (byte)FilterType.FILTER_DELTA)
-        {
-            //Filter.Channels=(Inp.fgetbits()>>11)+1;
-            Filter.Channels = (byte)((Inp.fgetbits() >> 11) + 1);
-            Inp.faddbits(5);
-        }
-
-        return true;
-    }
-
     //?
     //        void UnpWriteBuf()
     //        {

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.cs

@@ -1,5 +1,7 @@
 using System;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Rar.Headers;
 using size_t = System.UInt32;
 
@@ -23,11 +25,11 @@ internal partial class Unpack : IRarUnpack
         // NOTE: caller has logic to check for -1 for error we throw instead.
         readStream.Read(buf, offset, count);
 
-    private async System.Threading.Tasks.Task<int> UnpIO_UnpReadAsync(
+    private async Task<int> UnpIO_UnpReadAsync(
         byte[] buf,
         int offset,
         int count,
-        System.Threading.CancellationToken cancellationToken = default
+        CancellationToken cancellationToken = default
     ) =>
         // NOTE: caller has logic to check for -1 for error we throw instead.
         await readStream.ReadAsync(buf, offset, count, cancellationToken).ConfigureAwait(false);
@@ -35,11 +37,11 @@ internal partial class Unpack : IRarUnpack
     private void UnpIO_UnpWrite(byte[] buf, size_t offset, uint count) =>
         writeStream.Write(buf, checked((int)offset), checked((int)count));
 
-    private async System.Threading.Tasks.Task UnpIO_UnpWriteAsync(
+    private async Task UnpIO_UnpWriteAsync(
         byte[] buf,
         size_t offset,
         uint count,
-        System.Threading.CancellationToken cancellationToken = default
+        CancellationToken cancellationToken = default
     ) =>
         await writeStream
             .WriteAsync(buf, checked((int)offset), checked((int)count), cancellationToken)
@@ -66,11 +68,11 @@ internal partial class Unpack : IRarUnpack
         DoUnpack();
     }
 
-    public async System.Threading.Tasks.Task DoUnpackAsync(
+    public async Task DoUnpackAsync(
         FileHeader fileHeader,
         Stream readStream,
         Stream writeStream,
-        System.Threading.CancellationToken cancellationToken = default
+        CancellationToken cancellationToken = default
     )
     {
         DestUnpSize = fileHeader.UncompressedSize;
@@ -97,9 +99,7 @@ internal partial class Unpack : IRarUnpack
         }
     }
 
-    public async System.Threading.Tasks.Task DoUnpackAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
+    public async Task DoUnpackAsync(CancellationToken cancellationToken = default)
     {
         if (fileHeader.IsStored)
         {
@@ -133,9 +133,7 @@ internal partial class Unpack : IRarUnpack
         } while (!Suspended);
     }
 
-    private async System.Threading.Tasks.Task UnstoreFileAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
+    private async Task UnstoreFileAsync(CancellationToken cancellationToken = default)
     {
         var buffer = new byte[(int)Math.Min(0x10000, DestUnpSize)];
         do

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack15_async.cs

@@ -0,0 +1,100 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SharpCompress.Compressors.Rar.UnpackV2017;
+
+internal partial class Unpack
+{
+    private async Task Unpack15Async(bool Solid, CancellationToken cancellationToken = default)
+    {
+        UnpInitData(Solid);
+        UnpInitData15(Solid);
+        await UnpReadBufAsync(cancellationToken).ConfigureAwait(false);
+        if (!Solid)
+        {
+            InitHuff();
+            UnpPtr = 0;
+        }
+        else
+        {
+            UnpPtr = WrPtr;
+        }
+
+        --DestUnpSize;
+        if (DestUnpSize >= 0)
+        {
+            GetFlagsBuf();
+            FlagsCnt = 8;
+        }
+
+        while (DestUnpSize >= 0)
+        {
+            UnpPtr &= MaxWinMask;
+
+            if (
+                Inp.InAddr > ReadTop - 30
+                && !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false)
+            )
+            {
+                break;
+            }
+
+            if (((WrPtr - UnpPtr) & MaxWinMask) < 270 && WrPtr != UnpPtr)
+            {
+                UnpWriteBuf20();
+            }
+
+            if (StMode != 0)
+            {
+                HuffDecode();
+                continue;
+            }
+
+            if (--FlagsCnt < 0)
+            {
+                GetFlagsBuf();
+                FlagsCnt = 7;
+            }
+
+            if ((FlagBuf & 0x80) != 0)
+            {
+                FlagBuf <<= 1;
+                if (Nlzb > Nhfb)
+                {
+                    LongLZ();
+                }
+                else
+                {
+                    HuffDecode();
+                }
+            }
+            else
+            {
+                FlagBuf <<= 1;
+                if (--FlagsCnt < 0)
+                {
+                    GetFlagsBuf();
+                    FlagsCnt = 7;
+                }
+                if ((FlagBuf & 0x80) != 0)
+                {
+                    FlagBuf <<= 1;
+                    if (Nlzb > Nhfb)
+                    {
+                        HuffDecode();
+                    }
+                    else
+                    {
+                        LongLZ();
+                    }
+                }
+                else
+                {
+                    FlagBuf <<= 1;
+                    ShortLZ();
+                }
+            }
+        }
+        UnpWriteBuf20();
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack15_cpp.cs

@@ -200,102 +200,6 @@ internal partial class Unpack
         UnpWriteBuf20();
     }
 
-    private async System.Threading.Tasks.Task Unpack15Async(
-        bool Solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        UnpInitData(Solid);
-        UnpInitData15(Solid);
-        await UnpReadBufAsync(cancellationToken).ConfigureAwait(false);
-        if (!Solid)
-        {
-            InitHuff();
-            UnpPtr = 0;
-        }
-        else
-        {
-            UnpPtr = WrPtr;
-        }
-
-        --DestUnpSize;
-        if (DestUnpSize >= 0)
-        {
-            GetFlagsBuf();
-            FlagsCnt = 8;
-        }
-
-        while (DestUnpSize >= 0)
-        {
-            UnpPtr &= MaxWinMask;
-
-            if (
-                Inp.InAddr > ReadTop - 30
-                && !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false)
-            )
-            {
-                break;
-            }
-
-            if (((WrPtr - UnpPtr) & MaxWinMask) < 270 && WrPtr != UnpPtr)
-            {
-                await UnpWriteBuf20Async(cancellationToken).ConfigureAwait(false);
-            }
-
-            if (StMode != 0)
-            {
-                HuffDecode();
-                continue;
-            }
-
-            if (--FlagsCnt < 0)
-            {
-                GetFlagsBuf();
-                FlagsCnt = 7;
-            }
-
-            if ((FlagBuf & 0x80) != 0)
-            {
-                FlagBuf <<= 1;
-                if (Nlzb > Nhfb)
-                {
-                    LongLZ();
-                }
-                else
-                {
-                    HuffDecode();
-                }
-            }
-            else
-            {
-                FlagBuf <<= 1;
-                if (--FlagsCnt < 0)
-                {
-                    GetFlagsBuf();
-                    FlagsCnt = 7;
-                }
-                if ((FlagBuf & 0x80) != 0)
-                {
-                    FlagBuf <<= 1;
-                    if (Nlzb > Nhfb)
-                    {
-                        HuffDecode();
-                    }
-                    else
-                    {
-                        LongLZ();
-                    }
-                }
-                else
-                {
-                    FlagBuf <<= 1;
-                    ShortLZ();
-                }
-            }
-        }
-        await UnpWriteBuf20Async(cancellationToken).ConfigureAwait(false);
-    }
-
     //#define GetShortLen1(pos) ((pos)==1 ? Buf60+3:ShortLen1[pos])
     private uint GetShortLen1(uint pos) => ((pos) == 1 ? (uint)(Buf60 + 3) : ShortLen1[pos]);
 

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack20_async.cs

@@ -0,0 +1,319 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using static SharpCompress.Compressors.Rar.UnpackV2017.PackDef;
+using static SharpCompress.Compressors.Rar.UnpackV2017.Unpack.Unpack20Local;
+
+namespace SharpCompress.Compressors.Rar.UnpackV2017;
+
+internal partial class Unpack
+{
+    private async Task Unpack20Async(bool Solid, CancellationToken cancellationToken = default)
+    {
+        uint Bits;
+
+        if (Suspended)
+        {
+            UnpPtr = WrPtr;
+        }
+        else
+        {
+            UnpInitData(Solid);
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return;
+            }
+
+            if (
+                (!Solid || !TablesRead2)
+                && !await ReadTables20Async(cancellationToken).ConfigureAwait(false)
+            )
+            {
+                return;
+            }
+
+            --DestUnpSize;
+        }
+
+        while (DestUnpSize >= 0)
+        {
+            UnpPtr &= MaxWinMask;
+
+            if (Inp.InAddr > ReadTop - 30)
+            {
+                if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+            }
+
+            if (((WrPtr - UnpPtr) & MaxWinMask) < 270 && WrPtr != UnpPtr)
+            {
+                UnpWriteBuf20();
+                if (Suspended)
+                {
+                    return;
+                }
+            }
+            if (UnpAudioBlock)
+            {
+                var AudioNumber = DecodeNumber(Inp, MD[UnpCurChannel]);
+
+                if (AudioNumber == 256)
+                {
+                    if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
+                    {
+                        break;
+                    }
+
+                    continue;
+                }
+                Window[UnpPtr++] = DecodeAudio((int)AudioNumber);
+                if (++UnpCurChannel == UnpChannels)
+                {
+                    UnpCurChannel = 0;
+                }
+
+                --DestUnpSize;
+                continue;
+            }
+
+            var Number = DecodeNumber(Inp, BlockTables.LD);
+            if (Number < 256)
+            {
+                Window[UnpPtr++] = (byte)Number;
+                --DestUnpSize;
+                continue;
+            }
+            if (Number > 269)
+            {
+                var Length = (uint)(LDecode[Number -= 270] + 3);
+                if ((Bits = LBits[Number]) > 0)
+                {
+                    Length += Inp.getbits() >> (int)(16 - Bits);
+                    Inp.addbits(Bits);
+                }
+
+                var DistNumber = DecodeNumber(Inp, BlockTables.DD);
+                var Distance = DDecode[DistNumber] + 1;
+                if ((Bits = DBits[DistNumber]) > 0)
+                {
+                    Distance += Inp.getbits() >> (int)(16 - Bits);
+                    Inp.addbits(Bits);
+                }
+
+                if (Distance >= 0x2000)
+                {
+                    Length++;
+                    if (Distance >= 0x40000L)
+                    {
+                        Length++;
+                    }
+                }
+
+                CopyString20(Length, Distance);
+                continue;
+            }
+            if (Number == 269)
+            {
+                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+
+                continue;
+            }
+            if (Number == 256)
+            {
+                CopyString20(LastLength, LastDist);
+                continue;
+            }
+            if (Number < 261)
+            {
+                var Distance = OldDist[(OldDistPtr - (Number - 256)) & 3];
+                var LengthNumber = DecodeNumber(Inp, BlockTables.RD);
+                var Length = (uint)(LDecode[LengthNumber] + 2);
+                if ((Bits = LBits[LengthNumber]) > 0)
+                {
+                    Length += Inp.getbits() >> (int)(16 - Bits);
+                    Inp.addbits(Bits);
+                }
+                if (Distance >= 0x101)
+                {
+                    Length++;
+                    if (Distance >= 0x2000)
+                    {
+                        Length++;
+                        if (Distance >= 0x40000)
+                        {
+                            Length++;
+                        }
+                    }
+                }
+                CopyString20(Length, Distance);
+                continue;
+            }
+            if (Number < 270)
+            {
+                var Distance = (uint)(SDDecode[Number -= 261] + 1);
+                if ((Bits = SDBits[Number]) > 0)
+                {
+                    Distance += Inp.getbits() >> (int)(16 - Bits);
+                    Inp.addbits(Bits);
+                }
+                CopyString20(2, Distance);
+                continue;
+            }
+        }
+        ReadLastTables();
+        UnpWriteBuf20();
+    }
+
+    private async Task UnpWriteBuf20Async(CancellationToken cancellationToken = default)
+    {
+        if (UnpPtr != WrPtr)
+        {
+            UnpSomeRead = true;
+        }
+
+        if (UnpPtr < WrPtr)
+        {
+            await UnpIO_UnpWriteAsync(
+                    Window,
+                    WrPtr,
+                    (uint)(-(int)WrPtr & MaxWinMask),
+                    cancellationToken
+                )
+                .ConfigureAwait(false);
+            await UnpIO_UnpWriteAsync(Window, 0, UnpPtr, cancellationToken).ConfigureAwait(false);
+            UnpAllBuf = true;
+        }
+        else
+        {
+            await UnpIO_UnpWriteAsync(Window, WrPtr, UnpPtr - WrPtr, cancellationToken)
+                .ConfigureAwait(false);
+        }
+
+        WrPtr = UnpPtr;
+    }
+
+    private async Task<bool> ReadTables20Async(CancellationToken cancellationToken = default)
+    {
+        byte[] BitLength = new byte[checked((int)BC20)];
+        byte[] Table = new byte[checked((int)MC20 * 4)];
+        if (Inp.InAddr > ReadTop - 25)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        var BitField = Inp.getbits();
+        UnpAudioBlock = (BitField & 0x8000) != 0;
+
+        if ((BitField & 0x4000) != 0)
+        {
+            Array.Clear(UnpOldTable20, 0, UnpOldTable20.Length);
+        }
+
+        Inp.addbits(2);
+
+        uint TableSize;
+        if (UnpAudioBlock)
+        {
+            UnpChannels = ((BitField >> 12) & 3) + 1;
+            if (UnpCurChannel >= UnpChannels)
+            {
+                UnpCurChannel = 0;
+            }
+
+            Inp.addbits(2);
+            TableSize = MC20 * UnpChannels;
+        }
+        else
+        {
+            TableSize = NC20 + DC20 + RC20;
+        }
+
+        for (int I = 0; I < checked((int)BC20); I++)
+        {
+            BitLength[I] = (byte)(Inp.getbits() >> 12);
+            Inp.addbits(4);
+        }
+        MakeDecodeTables(BitLength, 0, BlockTables.BD, BC20);
+        for (int I = 0; I < checked((int)TableSize); )
+        {
+            if (Inp.InAddr > ReadTop - 5)
+            {
+                if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    return false;
+                }
+            }
+
+            var Number = DecodeNumber(Inp, BlockTables.BD);
+            if (Number < 16)
+            {
+                Table[I] = (byte)((Number + UnpOldTable20[I]) & 0xf);
+                I++;
+            }
+            else if (Number == 16)
+            {
+                var N = (Inp.getbits() >> 14) + 3;
+                Inp.addbits(2);
+                if (I == 0)
+                {
+                    return false; // We cannot have "repeat previous" code at the first position.
+                }
+                else
+                {
+                    while (N-- > 0 && I < TableSize)
+                    {
+                        Table[I] = Table[I - 1];
+                        I++;
+                    }
+                }
+            }
+            else
+            {
+                uint N;
+                if (Number == 17)
+                {
+                    N = (Inp.getbits() >> 13) + 3;
+                    Inp.addbits(3);
+                }
+                else
+                {
+                    N = (Inp.getbits() >> 9) + 11;
+                    Inp.addbits(7);
+                }
+                while (N-- > 0 && I < TableSize)
+                {
+                    Table[I++] = 0;
+                }
+            }
+        }
+        TablesRead2 = true;
+        if (Inp.InAddr > ReadTop)
+        {
+            return true;
+        }
+
+        if (UnpAudioBlock)
+        {
+            for (int I = 0; I < UnpChannels; I++)
+            {
+                MakeDecodeTables(Table, (int)(I * MC20), MD[I], MC20);
+            }
+        }
+        else
+        {
+            MakeDecodeTables(Table, 0, BlockTables.LD, NC20);
+            MakeDecodeTables(Table, (int)NC20, BlockTables.DD, DC20);
+            MakeDecodeTables(Table, (int)(NC20 + DC20), BlockTables.RD, RC20);
+        }
+        Array.Copy(Table, 0, this.UnpOldTable20, 0, UnpOldTable20.Length);
+        return true;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack20_cpp.cs

@@ -342,170 +342,6 @@ internal partial class Unpack
         UnpWriteBuf20();
     }
 
-    private async System.Threading.Tasks.Task Unpack20Async(
-        bool Solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        uint Bits;
-
-        if (Suspended)
-        {
-            UnpPtr = WrPtr;
-        }
-        else
-        {
-            UnpInitData(Solid);
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return;
-            }
-
-            if (
-                (!Solid || !TablesRead2)
-                && !await ReadTables20Async(cancellationToken).ConfigureAwait(false)
-            )
-            {
-                return;
-            }
-
-            --DestUnpSize;
-        }
-
-        while (DestUnpSize >= 0)
-        {
-            UnpPtr &= MaxWinMask;
-
-            if (Inp.InAddr > ReadTop - 30)
-            {
-                if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-            }
-
-            if (((WrPtr - UnpPtr) & MaxWinMask) < 270 && WrPtr != UnpPtr)
-            {
-                await UnpWriteBuf20Async(cancellationToken).ConfigureAwait(false);
-                if (Suspended)
-                {
-                    return;
-                }
-            }
-            if (UnpAudioBlock)
-            {
-                var AudioNumber = DecodeNumber(Inp, MD[UnpCurChannel]);
-
-                if (AudioNumber == 256)
-                {
-                    if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
-                    {
-                        break;
-                    }
-
-                    continue;
-                }
-                Window[UnpPtr++] = DecodeAudio((int)AudioNumber);
-                if (++UnpCurChannel == UnpChannels)
-                {
-                    UnpCurChannel = 0;
-                }
-
-                --DestUnpSize;
-                continue;
-            }
-
-            var Number = DecodeNumber(Inp, BlockTables.LD);
-            if (Number < 256)
-            {
-                Window[UnpPtr++] = (byte)Number;
-                --DestUnpSize;
-                continue;
-            }
-            if (Number > 269)
-            {
-                var Length = (uint)(LDecode[Number -= 270] + 3);
-                if ((Bits = LBits[Number]) > 0)
-                {
-                    Length += Inp.getbits() >> (int)(16 - Bits);
-                    Inp.addbits(Bits);
-                }
-
-                var DistNumber = DecodeNumber(Inp, BlockTables.DD);
-                var Distance = DDecode[DistNumber] + 1;
-                if ((Bits = DBits[DistNumber]) > 0)
-                {
-                    Distance += Inp.getbits() >> (int)(16 - Bits);
-                    Inp.addbits(Bits);
-                }
-
-                if (Distance >= 0x2000)
-                {
-                    Length++;
-                    if (Distance >= 0x40000L)
-                    {
-                        Length++;
-                    }
-                }
-
-                CopyString20(Length, Distance);
-                continue;
-            }
-            if (Number == 269)
-            {
-                if (!await ReadTables20Async(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-
-                continue;
-            }
-            if (Number == 256)
-            {
-                CopyString20(LastLength, LastDist);
-                continue;
-            }
-            if (Number < 261)
-            {
-                var Distance = OldDist[(OldDistPtr - (Number - 256)) & 3];
-                var LengthNumber = DecodeNumber(Inp, BlockTables.RD);
-                var Length = (uint)(LDecode[LengthNumber] + 2);
-                if ((Bits = LBits[LengthNumber]) > 0)
-                {
-                    Length += Inp.getbits() >> (int)(16 - Bits);
-                    Inp.addbits(Bits);
-                }
-                if (Distance >= 0x101)
-                {
-                    Length++;
-                    if (Distance >= 0x2000)
-                    {
-                        Length++;
-                        if (Distance >= 0x40000)
-                        {
-                            Length++;
-                        }
-                    }
-                }
-                CopyString20(Length, Distance);
-                continue;
-            }
-            if (Number < 270)
-            {
-                var Distance = (uint)(SDDecode[Number -= 261] + 1);
-                if ((Bits = SDBits[Number]) > 0)
-                {
-                    Distance += Inp.getbits() >> (int)(16 - Bits);
-                    Inp.addbits(Bits);
-                }
-                CopyString20(2, Distance);
-                continue;
-            }
-        }
-        ReadLastTables();
-        await UnpWriteBuf20Async(cancellationToken).ConfigureAwait(false);
-    }
-
     private void UnpWriteBuf20()
     {
         if (UnpPtr != WrPtr)
@@ -527,36 +363,6 @@ internal partial class Unpack
         WrPtr = UnpPtr;
     }
 
-    private async System.Threading.Tasks.Task UnpWriteBuf20Async(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (UnpPtr != WrPtr)
-        {
-            UnpSomeRead = true;
-        }
-
-        if (UnpPtr < WrPtr)
-        {
-            await UnpIO_UnpWriteAsync(
-                    Window,
-                    WrPtr,
-                    (uint)(-(int)WrPtr & MaxWinMask),
-                    cancellationToken
-                )
-                .ConfigureAwait(false);
-            await UnpIO_UnpWriteAsync(Window, 0, UnpPtr, cancellationToken).ConfigureAwait(false);
-            UnpAllBuf = true;
-        }
-        else
-        {
-            await UnpIO_UnpWriteAsync(Window, WrPtr, UnpPtr - WrPtr, cancellationToken)
-                .ConfigureAwait(false);
-        }
-
-        WrPtr = UnpPtr;
-    }
-
     private bool ReadTables20()
     {
         Span<byte> BitLength = stackalloc byte[checked((int)BC20)];
@@ -677,130 +483,6 @@ internal partial class Unpack
         return true;
     }
 
-    private async System.Threading.Tasks.Task<bool> ReadTables20Async(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        byte[] BitLength = new byte[checked((int)BC20)];
-        byte[] Table = new byte[checked((int)MC20 * 4)];
-        if (Inp.InAddr > ReadTop - 25)
-        {
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return false;
-            }
-        }
-
-        var BitField = Inp.getbits();
-        UnpAudioBlock = (BitField & 0x8000) != 0;
-
-        if ((BitField & 0x4000) != 0)
-        {
-            Array.Clear(UnpOldTable20, 0, UnpOldTable20.Length);
-        }
-
-        Inp.addbits(2);
-
-        uint TableSize;
-        if (UnpAudioBlock)
-        {
-            UnpChannels = ((BitField >> 12) & 3) + 1;
-            if (UnpCurChannel >= UnpChannels)
-            {
-                UnpCurChannel = 0;
-            }
-
-            Inp.addbits(2);
-            TableSize = MC20 * UnpChannels;
-        }
-        else
-        {
-            TableSize = NC20 + DC20 + RC20;
-        }
-
-        for (int I = 0; I < checked((int)BC20); I++)
-        {
-            BitLength[I] = (byte)(Inp.getbits() >> 12);
-            Inp.addbits(4);
-        }
-        MakeDecodeTables(BitLength, 0, BlockTables.BD, BC20);
-        for (int I = 0; I < checked((int)TableSize); )
-        {
-            if (Inp.InAddr > ReadTop - 5)
-            {
-                if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    return false;
-                }
-            }
-
-            var Number = DecodeNumber(Inp, BlockTables.BD);
-            if (Number < 16)
-            {
-                Table[I] = (byte)((Number + UnpOldTable20[I]) & 0xF);
-                I++;
-            }
-            else if (Number < 18)
-            {
-                uint N;
-                if (Number == 16)
-                {
-                    N = (Inp.getbits() >> 14) + 3;
-                    Inp.addbits(2);
-                }
-                else
-                {
-                    N = (Inp.getbits() >> 13) + 11;
-                    Inp.addbits(3);
-                }
-                if (I == 0)
-                {
-                    return false;
-                }
-
-                while (N-- > 0 && I < checked((int)TableSize))
-                {
-                    Table[I] = Table[I - 1];
-                    I++;
-                }
-            }
-            else
-            {
-                uint N;
-                if (Number == 18)
-                {
-                    N = (Inp.getbits() >> 13) + 3;
-                    Inp.addbits(3);
-                }
-                else
-                {
-                    N = (Inp.getbits() >> 9) + 11;
-                    Inp.addbits(7);
-                }
-
-                while (N-- > 0 && I < checked((int)TableSize))
-                {
-                    Table[I++] = 0;
-                }
-            }
-        }
-        if (UnpAudioBlock)
-        {
-            for (int I = 0; I < UnpChannels; I++)
-            {
-                MakeDecodeTables(Table, (int)(I * MC20), MD[I], MC20);
-            }
-        }
-        else
-        {
-            MakeDecodeTables(Table, 0, BlockTables.LD, NC20);
-            MakeDecodeTables(Table, (int)NC20, BlockTables.DD, DC20);
-            MakeDecodeTables(Table, (int)(NC20 + DC20), BlockTables.RD, RC20);
-        }
-        Array.Copy(Table, 0, this.UnpOldTable20, 0, UnpOldTable20.Length);
-        return true;
-    }
-
     private void ReadLastTables()
     {
         if (ReadTop >= Inp.InAddr + 5)

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack50_async.cs

@@ -0,0 +1,709 @@
+#nullable disable
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using static SharpCompress.Compressors.Rar.UnpackV2017.PackDef;
+using static SharpCompress.Compressors.Rar.UnpackV2017.UnpackGlobal;
+using size_t = System.UInt32;
+
+namespace SharpCompress.Compressors.Rar.UnpackV2017;
+
+internal partial class Unpack
+{
+    private async Task Unpack5Async(bool Solid, CancellationToken cancellationToken = default)
+    {
+        FileExtracted = true;
+
+        if (!Suspended)
+        {
+            UnpInitData(Solid);
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return;
+            }
+
+            // Check TablesRead5 to be sure that we read tables at least once
+            // regardless of current block header TablePresent flag.
+            // So we can safefly use these tables below.
+            if (
+                !await ReadBlockHeaderAsync(Inp, cancellationToken).ConfigureAwait(false)
+                || !await ReadTablesAsync(Inp, cancellationToken).ConfigureAwait(false)
+                || !TablesRead5
+            )
+            {
+                return;
+            }
+        }
+
+        while (true)
+        {
+            UnpPtr &= MaxWinMask;
+
+            if (Inp.InAddr >= ReadBorder)
+            {
+                var FileDone = false;
+
+                // We use 'while', because for empty block containing only Huffman table,
+                // we'll be on the block border once again just after reading the table.
+                while (
+                    Inp.InAddr > BlockHeader.BlockStart + BlockHeader.BlockSize - 1
+                    || Inp.InAddr == BlockHeader.BlockStart + BlockHeader.BlockSize - 1
+                        && Inp.InBit >= BlockHeader.BlockBitSize
+                )
+                {
+                    if (BlockHeader.LastBlockInFile)
+                    {
+                        FileDone = true;
+                        break;
+                    }
+                    if (
+                        !await ReadBlockHeaderAsync(Inp, cancellationToken).ConfigureAwait(false)
+                        || !await ReadTablesAsync(Inp, cancellationToken).ConfigureAwait(false)
+                    )
+                    {
+                        return;
+                    }
+                }
+                if (FileDone || !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    break;
+                }
+            }
+
+            if (((WriteBorder - UnpPtr) & MaxWinMask) < MAX_LZ_MATCH + 3 && WriteBorder != UnpPtr)
+            {
+                await UnpWriteBufAsync(cancellationToken);
+                if (WrittenFileSize > DestUnpSize)
+                {
+                    return;
+                }
+
+                if (Suspended)
+                {
+                    FileExtracted = false;
+                    return;
+                }
+            }
+
+            var MainSlot = DecodeNumber(Inp, BlockTables.LD);
+            if (MainSlot < 256)
+            {
+                if (Fragmented)
+                {
+                    FragWindow[UnpPtr++] = (byte)MainSlot;
+                }
+                else
+                {
+                    Window[UnpPtr++] = (byte)MainSlot;
+                }
+                continue;
+            }
+            if (MainSlot >= 262)
+            {
+                var Length = SlotToLength(Inp, MainSlot - 262);
+
+                uint DBits,
+                    Distance = 1,
+                    DistSlot = DecodeNumber(Inp, BlockTables.DD);
+                if (DistSlot < 4)
+                {
+                    DBits = 0;
+                    Distance += DistSlot;
+                }
+                else
+                {
+                    DBits = (DistSlot / 2) - 1;
+                    Distance += (2 | (DistSlot & 1)) << (int)DBits;
+                }
+
+                if (DBits > 0)
+                {
+                    if (DBits >= 4)
+                    {
+                        if (DBits > 4)
+                        {
+                            Distance += ((Inp.getbits32() >> (int)(36 - DBits)) << 4);
+                            Inp.addbits(DBits - 4);
+                        }
+
+                        var LowDist = DecodeNumber(Inp, BlockTables.LDD);
+                        Distance += LowDist;
+                    }
+                    else
+                    {
+                        Distance += Inp.getbits32() >> (int)(32 - DBits);
+                        Inp.addbits(DBits);
+                    }
+                }
+
+                if (Distance > 0x100)
+                {
+                    Length++;
+                    if (Distance > 0x2000)
+                    {
+                        Length++;
+                        if (Distance > 0x40000)
+                        {
+                            Length++;
+                        }
+                    }
+                }
+
+                InsertOldDist(Distance);
+                LastLength = Length;
+                if (Fragmented)
+                {
+                    FragWindow.CopyString(Length, Distance, ref UnpPtr, MaxWinMask);
+                }
+                else
+                {
+                    CopyString(Length, Distance);
+                }
+                continue;
+            }
+            if (MainSlot == 256)
+            {
+                var Filter = new UnpackFilter();
+                if (
+                    !await ReadFilterAsync(Inp, Filter, cancellationToken).ConfigureAwait(false)
+                    || !AddFilter(Filter)
+                )
+                {
+                    break;
+                }
+                continue;
+            }
+            if (MainSlot == 257)
+            {
+                if (LastLength != 0)
+                {
+                    if (Fragmented)
+                    {
+                        FragWindow.CopyString(LastLength, OldDist[0], ref UnpPtr, MaxWinMask);
+                    }
+                    else
+                    {
+                        CopyString(LastLength, OldDist[0]);
+                    }
+                }
+                continue;
+            }
+            if (MainSlot < 262)
+            {
+                var DistNum = MainSlot - 258;
+                var Distance = OldDist[DistNum];
+                for (var I = DistNum; I > 0; I--)
+                {
+                    OldDist[I] = OldDist[I - 1];
+                }
+
+                OldDist[0] = Distance;
+
+                var LengthSlot = DecodeNumber(Inp, BlockTables.RD);
+                var Length = SlotToLength(Inp, LengthSlot);
+                LastLength = Length;
+                if (Fragmented)
+                {
+                    FragWindow.CopyString(Length, Distance, ref UnpPtr, MaxWinMask);
+                }
+                else
+                {
+                    CopyString(Length, Distance);
+                }
+
+                continue;
+            }
+        }
+        await UnpWriteBufAsync(cancellationToken);
+    }
+
+    private async Task<bool> ReadFilterAsync(
+        BitInput Inp,
+        UnpackFilter Filter,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 16)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        Filter.BlockStart = ReadFilterData(Inp);
+        Filter.BlockLength = ReadFilterData(Inp);
+        if (Filter.BlockLength > MAX_FILTER_BLOCK_SIZE)
+        {
+            Filter.BlockLength = 0;
+        }
+
+        Filter.Type = (byte)(Inp.fgetbits() >> 13);
+        Inp.faddbits(3);
+
+        if (Filter.Type == FILTER_DELTA)
+        {
+            Filter.Channels = (byte)((Inp.fgetbits() >> 11) + 1);
+            Inp.faddbits(5);
+        }
+
+        return true;
+    }
+
+    private async Task<bool> UnpReadBufAsync(CancellationToken cancellationToken = default)
+    {
+        var DataSize = ReadTop - Inp.InAddr; // Data left to process.
+        if (DataSize < 0)
+        {
+            return false;
+        }
+
+        BlockHeader.BlockSize -= Inp.InAddr - BlockHeader.BlockStart;
+        if (Inp.InAddr > MAX_SIZE / 2)
+        {
+            if (DataSize > 0)
+            {
+                Buffer.BlockCopy(Inp.InBuf, Inp.InAddr, Inp.InBuf, 0, DataSize);
+            }
+
+            Inp.InAddr = 0;
+            ReadTop = DataSize;
+        }
+        else
+        {
+            DataSize = ReadTop;
+        }
+
+        var ReadCode = 0;
+        if (MAX_SIZE != DataSize)
+        {
+            ReadCode = await UnpIO_UnpReadAsync(
+                    Inp.InBuf,
+                    DataSize,
+                    MAX_SIZE - DataSize,
+                    cancellationToken
+                )
+                .ConfigureAwait(false);
+        }
+
+        if (ReadCode > 0) // Can be also -1.
+        {
+            ReadTop += ReadCode;
+        }
+
+        ReadBorder = ReadTop - 30;
+        BlockHeader.BlockStart = Inp.InAddr;
+        if (BlockHeader.BlockSize != -1) // '-1' means not defined yet.
+        {
+            ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
+        }
+        return ReadCode != -1;
+    }
+
+    private async Task UnpWriteBufAsync(CancellationToken cancellationToken = default)
+    {
+        var WrittenBorder = WrPtr;
+        var FullWriteSize = (UnpPtr - WrittenBorder) & MaxWinMask;
+        var WriteSizeLeft = FullWriteSize;
+        var NotAllFiltersProcessed = false;
+
+        for (var I = 0; I < Filters.Count; I++)
+        {
+            var flt = Filters[I];
+            if (flt.Type == FILTER_NONE)
+            {
+                continue;
+            }
+
+            if (flt.NextWindow)
+            {
+                if (((flt.BlockStart - WrPtr) & MaxWinMask) <= FullWriteSize)
+                {
+                    flt.NextWindow = false;
+                }
+                continue;
+            }
+
+            var BlockStart = flt.BlockStart;
+            var BlockLength = flt.BlockLength;
+            if (((BlockStart - WrittenBorder) & MaxWinMask) < WriteSizeLeft)
+            {
+                if (WrittenBorder != BlockStart)
+                {
+                    await UnpWriteAreaAsync(WrittenBorder, BlockStart, cancellationToken)
+                        .ConfigureAwait(false);
+                    WrittenBorder = BlockStart;
+                    WriteSizeLeft = (UnpPtr - WrittenBorder) & MaxWinMask;
+                }
+                if (BlockLength <= WriteSizeLeft)
+                {
+                    if (BlockLength > 0)
+                    {
+                        var BlockEnd = (BlockStart + BlockLength) & MaxWinMask;
+
+                        FilterSrcMemory = EnsureCapacity(
+                            FilterSrcMemory,
+                            checked((int)BlockLength)
+                        );
+                        var Mem = FilterSrcMemory;
+                        if (BlockStart < BlockEnd || BlockEnd == 0)
+                        {
+                            if (Fragmented)
+                            {
+                                FragWindow.CopyData(Mem, 0, BlockStart, BlockLength);
+                            }
+                            else
+                            {
+                                Buffer.BlockCopy(Window, (int)BlockStart, Mem, 0, (int)BlockLength);
+                            }
+                        }
+                        else
+                        {
+                            var FirstPartLength = MaxWinSize - BlockStart;
+                            if (Fragmented)
+                            {
+                                FragWindow.CopyData(Mem, 0, BlockStart, FirstPartLength);
+                                FragWindow.CopyData(Mem, FirstPartLength, 0, BlockEnd);
+                            }
+                            else
+                            {
+                                Buffer.BlockCopy(
+                                    Window,
+                                    (int)BlockStart,
+                                    Mem,
+                                    0,
+                                    (int)FirstPartLength
+                                );
+                                Buffer.BlockCopy(
+                                    Window,
+                                    0,
+                                    Mem,
+                                    (int)FirstPartLength,
+                                    (int)BlockEnd
+                                );
+                            }
+                        }
+
+                        var OutMem = ApplyFilter(Mem, BlockLength, flt);
+
+                        Filters[I].Type = FILTER_NONE;
+
+                        if (OutMem != null)
+                        {
+                            await UnpIO_UnpWriteAsync(OutMem, 0, BlockLength, cancellationToken)
+                                .ConfigureAwait(false);
+                            WrittenFileSize += BlockLength;
+                        }
+
+                        WrittenBorder = BlockEnd;
+                        WriteSizeLeft = (UnpPtr - WrittenBorder) & MaxWinMask;
+                    }
+                }
+                else
+                {
+                    NotAllFiltersProcessed = true;
+                    for (var J = I; J < Filters.Count; J++)
+                    {
+                        var fltj = Filters[J];
+                        if (
+                            fltj.Type != FILTER_NONE
+                            && fltj.NextWindow == false
+                            && ((fltj.BlockStart - WrPtr) & MaxWinMask) < FullWriteSize
+                        )
+                        {
+                            fltj.NextWindow = true;
+                        }
+                    }
+                    break;
+                }
+            }
+        }
+
+        var EmptyCount = 0;
+        for (var I = 0; I < Filters.Count; I++)
+        {
+            if (EmptyCount > 0)
+            {
+                Filters[I - EmptyCount] = Filters[I];
+            }
+
+            if (Filters[I].Type == FILTER_NONE)
+            {
+                EmptyCount++;
+            }
+        }
+        if (EmptyCount > 0)
+        {
+            Filters.RemoveRange(Filters.Count - EmptyCount, EmptyCount);
+        }
+
+        if (!NotAllFiltersProcessed)
+        {
+            await UnpWriteAreaAsync(WrittenBorder, UnpPtr, cancellationToken).ConfigureAwait(false);
+            WrPtr = UnpPtr;
+        }
+
+        WriteBorder = (UnpPtr + Math.Min(MaxWinSize, UNPACK_MAX_WRITE)) & MaxWinMask;
+
+        if (
+            WriteBorder == UnpPtr
+            || WrPtr != UnpPtr
+                && ((WrPtr - UnpPtr) & MaxWinMask) < ((WriteBorder - UnpPtr) & MaxWinMask)
+        )
+        {
+            WriteBorder = WrPtr;
+        }
+    }
+
+    private async Task UnpWriteAreaAsync(
+        size_t StartPtr,
+        size_t EndPtr,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (EndPtr != StartPtr)
+        {
+            UnpSomeRead = true;
+        }
+
+        if (EndPtr < StartPtr)
+        {
+            UnpAllBuf = true;
+        }
+
+        if (Fragmented)
+        {
+            var SizeToWrite = (EndPtr - StartPtr) & MaxWinMask;
+            while (SizeToWrite > 0)
+            {
+                var BlockSize = FragWindow.GetBlockSize(StartPtr, SizeToWrite);
+                FragWindow.GetBuffer(StartPtr, out var __buffer, out var __offset);
+                await UnpWriteDataAsync(__buffer, __offset, BlockSize, cancellationToken)
+                    .ConfigureAwait(false);
+                SizeToWrite -= BlockSize;
+                StartPtr = (StartPtr + BlockSize) & MaxWinMask;
+            }
+        }
+        else if (EndPtr < StartPtr)
+        {
+            await UnpWriteDataAsync(Window, StartPtr, MaxWinSize - StartPtr, cancellationToken)
+                .ConfigureAwait(false);
+            await UnpWriteDataAsync(Window, 0, EndPtr, cancellationToken).ConfigureAwait(false);
+        }
+        else
+        {
+            await UnpWriteDataAsync(Window, StartPtr, EndPtr - StartPtr, cancellationToken)
+                .ConfigureAwait(false);
+        }
+    }
+
+    private async Task UnpWriteDataAsync(
+        byte[] Data,
+        size_t offset,
+        size_t Size,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (WrittenFileSize >= DestUnpSize)
+        {
+            return;
+        }
+
+        var WriteSize = Size;
+        var LeftToWrite = DestUnpSize - WrittenFileSize;
+        if (WriteSize > LeftToWrite)
+        {
+            WriteSize = (size_t)LeftToWrite;
+        }
+
+        await UnpIO_UnpWriteAsync(Data, offset, WriteSize, cancellationToken).ConfigureAwait(false);
+        WrittenFileSize += Size;
+    }
+
+    private async Task<bool> ReadBlockHeaderAsync(
+        BitInput Inp,
+        CancellationToken cancellationToken = default
+    )
+    {
+        BlockHeader.HeaderSize = 0;
+
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 7)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        Inp.faddbits((uint)((8 - Inp.InBit) & 7));
+
+        var BlockFlags = (byte)(Inp.fgetbits() >> 8);
+        Inp.faddbits(8);
+        var ByteCount = (uint)(((BlockFlags >> 3) & 3) + 1); // Block size byte count.
+
+        if (ByteCount == 4)
+        {
+            return false;
+        }
+
+        BlockHeader.HeaderSize = (int)(2 + ByteCount);
+
+        BlockHeader.BlockBitSize = (BlockFlags & 7) + 1;
+
+        var SavedCheckSum = (byte)(Inp.fgetbits() >> 8);
+        Inp.faddbits(8);
+
+        var BlockSize = 0;
+        for (uint I = 0; I < ByteCount; I++)
+        {
+            BlockSize += (int)((Inp.fgetbits() >> 8) << (int)(I * 8));
+            Inp.addbits(8);
+        }
+
+        BlockHeader.BlockSize = BlockSize;
+        var CheckSum = (byte)(0x5a ^ BlockFlags ^ BlockSize ^ (BlockSize >> 8) ^ (BlockSize >> 16));
+        if (CheckSum != SavedCheckSum)
+        {
+            return false;
+        }
+
+        BlockHeader.BlockStart = Inp.InAddr;
+        ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
+
+        BlockHeader.LastBlockInFile = (BlockFlags & 0x40) != 0;
+        BlockHeader.TablePresent = (BlockFlags & 0x80) != 0;
+        return true;
+    }
+
+    private async Task<bool> ReadTablesAsync(
+        BitInput Inp,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!BlockHeader.TablePresent)
+        {
+            return true;
+        }
+
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 25)
+        {
+            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+            {
+                return false;
+            }
+        }
+
+        var BitLength = new byte[checked((int)BC)];
+        for (int I = 0; I < BC; I++)
+        {
+            uint Length = (byte)(Inp.fgetbits() >> 12);
+            Inp.faddbits(4);
+            if (Length == 15)
+            {
+                uint ZeroCount = (byte)(Inp.fgetbits() >> 12);
+                Inp.faddbits(4);
+                if (ZeroCount == 0)
+                {
+                    BitLength[I] = 15;
+                }
+                else
+                {
+                    ZeroCount += 2;
+                    while (ZeroCount-- > 0 && I < BitLength.Length)
+                    {
+                        BitLength[I++] = 0;
+                    }
+
+                    I--;
+                }
+            }
+            else
+            {
+                BitLength[I] = (byte)Length;
+            }
+        }
+
+        MakeDecodeTables(BitLength, 0, BlockTables.BD, BC);
+
+        var Table = new byte[checked((int)HUFF_TABLE_SIZE)];
+        const int TableSize = checked((int)HUFF_TABLE_SIZE);
+        for (int I = 0; I < TableSize; )
+        {
+            if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 5)
+            {
+                if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
+                {
+                    return false;
+                }
+            }
+
+            var Number = DecodeNumber(Inp, BlockTables.BD);
+            if (Number < 16)
+            {
+                Table[I] = (byte)Number;
+                I++;
+            }
+            else if (Number < 18)
+            {
+                uint N;
+                if (Number == 16)
+                {
+                    N = (Inp.fgetbits() >> 13) + 3;
+                    Inp.faddbits(3);
+                }
+                else
+                {
+                    N = (Inp.fgetbits() >> 9) + 11;
+                    Inp.faddbits(7);
+                }
+                if (I == 0)
+                {
+                    // We cannot have "repeat previous" code at the first position.
+                    // Multiple such codes would shift Inp position without changing I,
+                    // which can lead to reading beyond of Inp boundary in mutithreading
+                    // mode, where Inp.ExternalBuffer disables bounds check and we just
+                    // reserve a lot of buffer space to not need such check normally.
+                    return false;
+                }
+                else
+                {
+                    while (N-- > 0 && I < TableSize)
+                    {
+                        Table[I] = Table[I - 1];
+                        I++;
+                    }
+                }
+            }
+            else
+            {
+                uint N;
+                if (Number == 18)
+                {
+                    N = (Inp.fgetbits() >> 13) + 3;
+                    Inp.faddbits(3);
+                }
+                else
+                {
+                    N = (Inp.fgetbits() >> 9) + 11;
+                    Inp.faddbits(7);
+                }
+                while (N-- > 0 && I < TableSize)
+                {
+                    Table[I++] = 0;
+                }
+            }
+        }
+        TablesRead5 = true;
+        if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop)
+        {
+            return false;
+        }
+
+        MakeDecodeTables(Table, 0, BlockTables.LD, NC);
+        MakeDecodeTables(Table, (int)NC, BlockTables.DD, DC);
+        MakeDecodeTables(Table, (int)(NC + DC), BlockTables.LDD, LDC);
+        MakeDecodeTables(Table, (int)(NC + DC + LDC), BlockTables.RD, RC);
+        return true;
+    }
+}

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack50_cpp.cs

@@ -24,11 +24,7 @@ internal partial class Unpack
             // Check TablesRead5 to be sure that we read tables at least once
             // regardless of current block header TablePresent flag.
             // So we can safefly use these tables below.
-            if (
-                !ReadBlockHeader(Inp, ref BlockHeader)
-                || !ReadTables(Inp, ref BlockHeader, ref BlockTables)
-                || !TablesRead5
-            )
+            if (!ReadBlockHeader(Inp) || !ReadTables(Inp) || !TablesRead5)
             {
                 return;
             }
@@ -55,10 +51,7 @@ internal partial class Unpack
                         FileDone = true;
                         break;
                     }
-                    if (
-                        !ReadBlockHeader(Inp, ref BlockHeader)
-                        || !ReadTables(Inp, ref BlockHeader, ref BlockTables)
-                    )
+                    if (!ReadBlockHeader(Inp) || !ReadTables(Inp))
                     {
                         return;
                     }
@@ -216,180 +209,6 @@ internal partial class Unpack
         UnpWriteBuf();
     }
 
-    private async System.Threading.Tasks.Task Unpack5Async(
-        bool Solid,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        FileExtracted = true;
-
-        if (!Suspended)
-        {
-            UnpInitData(Solid);
-            if (!await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-            {
-                return;
-            }
-
-            if (
-                !ReadBlockHeader(Inp, ref BlockHeader)
-                || !ReadTables(Inp, ref BlockHeader, ref BlockTables)
-                || !TablesRead5
-            )
-            {
-                return;
-            }
-        }
-
-        while (true)
-        {
-            UnpPtr &= MaxWinMask;
-
-            if (Inp.InAddr >= ReadBorder)
-            {
-                var FileDone = false;
-
-                while (
-                    Inp.InAddr > BlockHeader.BlockStart + BlockHeader.BlockSize - 1
-                    || Inp.InAddr == BlockHeader.BlockStart + BlockHeader.BlockSize - 1
-                        && Inp.InBit >= BlockHeader.BlockBitSize
-                )
-                {
-                    if (BlockHeader.LastBlockInFile)
-                    {
-                        FileDone = true;
-                        break;
-                    }
-                    if (
-                        !ReadBlockHeader(Inp, ref BlockHeader)
-                        || !ReadTables(Inp, ref BlockHeader, ref BlockTables)
-                    )
-                    {
-                        return;
-                    }
-                }
-                if (FileDone || !await UnpReadBufAsync(cancellationToken).ConfigureAwait(false))
-                {
-                    break;
-                }
-            }
-
-            if (((WriteBorder - UnpPtr) & MaxWinMask) < MAX_LZ_MATCH + 3 && WriteBorder != UnpPtr)
-            {
-                await UnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-                if (WrittenFileSize > DestUnpSize)
-                {
-                    return;
-                }
-            }
-
-            uint MainSlot = DecodeNumber(Inp, BlockTables.LD);
-            if (MainSlot < 256)
-            {
-                if (Fragmented)
-                {
-                    FragWindow[UnpPtr++] = (byte)MainSlot;
-                }
-                else
-                {
-                    Window[UnpPtr++] = (byte)MainSlot;
-                }
-                continue;
-            }
-            if (MainSlot >= 262)
-            {
-                uint Length = SlotToLength(Inp, MainSlot - 262);
-
-                uint DBits,
-                    Distance = 1,
-                    DistSlot = DecodeNumber(Inp, BlockTables.DD);
-                if (DistSlot < 4)
-                {
-                    DBits = 0;
-                    Distance += DistSlot;
-                }
-                else
-                {
-                    DBits = (DistSlot / 2) - 1;
-                    Distance += (2 | (DistSlot & 1)) << (int)DBits;
-                }
-
-                if (DBits > 0)
-                {
-                    if (DBits >= 4)
-                    {
-                        if (DBits > 4)
-                        {
-                            Distance += ((Inp.getbits() >> (int)(20 - DBits)) << 4);
-                            Inp.addbits(DBits - 4);
-                        }
-
-                        uint LowDist = DecodeNumber(Inp, BlockTables.LDD);
-                        Distance += LowDist;
-                    }
-                    else
-                    {
-                        Distance += Inp.getbits() >> (int)(16 - DBits);
-                        Inp.addbits(DBits);
-                    }
-                }
-
-                if (Distance > 0x100)
-                {
-                    Length++;
-                    if (Distance > 0x2000)
-                    {
-                        Length++;
-                        if (Distance > 0x40000)
-                        {
-                            Length++;
-                        }
-                    }
-                }
-
-                InsertOldDist(Distance);
-                LastLength = Length;
-                CopyString(Length, Distance);
-                continue;
-            }
-            if (MainSlot == 256)
-            {
-                var Filter = new UnpackFilter();
-                if (!ReadFilter(Inp, Filter) || !AddFilter(Filter))
-                {
-                    break;
-                }
-                continue;
-            }
-            if (MainSlot == 257)
-            {
-                if (LastLength != 0)
-                {
-                    CopyString((uint)LastLength, (uint)OldDist[0]);
-                }
-                continue;
-            }
-            if (MainSlot < 262)
-            {
-                uint DistNum = MainSlot - 258;
-                uint Distance = (uint)OldDist[(int)DistNum];
-                for (var I = (int)DistNum; I > 0; I--)
-                {
-                    OldDist[I] = OldDist[I - 1];
-                }
-                OldDist[0] = Distance;
-
-                uint LengthSlot = DecodeNumber(Inp, BlockTables.RD);
-                uint Length = SlotToLength(Inp, LengthSlot);
-                LastLength = Length;
-                CopyString(Length, Distance);
-
-                continue;
-            }
-        }
-        await UnpWriteBufAsync(cancellationToken).ConfigureAwait(false);
-    }
-
     private uint ReadFilterData(BitInput Inp)
     {
         var ByteCount = (Inp.fgetbits() >> 14) + 1;
@@ -507,58 +326,6 @@ internal partial class Unpack
         return ReadCode != -1;
     }
 
-    private async System.Threading.Tasks.Task<bool> UnpReadBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var DataSize = ReadTop - Inp.InAddr; // Data left to process.
-        if (DataSize < 0)
-        {
-            return false;
-        }
-
-        BlockHeader.BlockSize -= Inp.InAddr - BlockHeader.BlockStart;
-        if (Inp.InAddr > MAX_SIZE / 2)
-        {
-            if (DataSize > 0)
-            {
-                Buffer.BlockCopy(Inp.InBuf, Inp.InAddr, Inp.InBuf, 0, DataSize);
-            }
-
-            Inp.InAddr = 0;
-            ReadTop = DataSize;
-        }
-        else
-        {
-            DataSize = ReadTop;
-        }
-
-        var ReadCode = 0;
-        if (MAX_SIZE != DataSize)
-        {
-            ReadCode = await UnpIO_UnpReadAsync(
-                    Inp.InBuf,
-                    DataSize,
-                    MAX_SIZE - DataSize,
-                    cancellationToken
-                )
-                .ConfigureAwait(false);
-        }
-
-        if (ReadCode > 0) // Can be also -1.
-        {
-            ReadTop += ReadCode;
-        }
-
-        ReadBorder = ReadTop - 30;
-        BlockHeader.BlockStart = Inp.InAddr;
-        if (BlockHeader.BlockSize != -1) // '-1' means not defined yet.
-        {
-            ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
-        }
-        return ReadCode != -1;
-    }
-
     private void UnpWriteBuf()
     {
         var WrittenBorder = WrPtr;
@@ -753,163 +520,6 @@ internal partial class Unpack
         }
     }
 
-    private async System.Threading.Tasks.Task UnpWriteBufAsync(
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        var WrittenBorder = WrPtr;
-        var FullWriteSize = (UnpPtr - WrittenBorder) & MaxWinMask;
-        var WriteSizeLeft = FullWriteSize;
-        var NotAllFiltersProcessed = false;
-
-        for (var I = 0; I < Filters.Count; I++)
-        {
-            var flt = Filters[I];
-            if (flt.Type == FILTER_NONE)
-            {
-                continue;
-            }
-
-            if (flt.NextWindow)
-            {
-                if (((flt.BlockStart - WrPtr) & MaxWinMask) <= FullWriteSize)
-                {
-                    flt.NextWindow = false;
-                }
-                continue;
-            }
-
-            var BlockStart = flt.BlockStart;
-            var BlockLength = flt.BlockLength;
-            if (((BlockStart - WrittenBorder) & MaxWinMask) < WriteSizeLeft)
-            {
-                if (WrittenBorder != BlockStart)
-                {
-                    await UnpWriteAreaAsync(WrittenBorder, BlockStart, cancellationToken)
-                        .ConfigureAwait(false);
-                    WrittenBorder = BlockStart;
-                    WriteSizeLeft = (UnpPtr - WrittenBorder) & MaxWinMask;
-                }
-                if (BlockLength <= WriteSizeLeft)
-                {
-                    if (BlockLength > 0)
-                    {
-                        var BlockEnd = (BlockStart + BlockLength) & MaxWinMask;
-
-                        FilterSrcMemory = EnsureCapacity(
-                            FilterSrcMemory,
-                            checked((int)BlockLength)
-                        );
-                        var Mem = FilterSrcMemory;
-                        if (BlockStart < BlockEnd || BlockEnd == 0)
-                        {
-                            if (Fragmented)
-                            {
-                                FragWindow.CopyData(Mem, 0, BlockStart, BlockLength);
-                            }
-                            else
-                            {
-                                Buffer.BlockCopy(Window, (int)BlockStart, Mem, 0, (int)BlockLength);
-                            }
-                        }
-                        else
-                        {
-                            var FirstPartLength = MaxWinSize - BlockStart;
-                            if (Fragmented)
-                            {
-                                FragWindow.CopyData(Mem, 0, BlockStart, FirstPartLength);
-                                FragWindow.CopyData(Mem, FirstPartLength, 0, BlockEnd);
-                            }
-                            else
-                            {
-                                Buffer.BlockCopy(
-                                    Window,
-                                    (int)BlockStart,
-                                    Mem,
-                                    0,
-                                    (int)FirstPartLength
-                                );
-                                Buffer.BlockCopy(
-                                    Window,
-                                    0,
-                                    Mem,
-                                    (int)FirstPartLength,
-                                    (int)BlockEnd
-                                );
-                            }
-                        }
-
-                        var OutMem = ApplyFilter(Mem, BlockLength, flt);
-
-                        Filters[I].Type = FILTER_NONE;
-
-                        if (OutMem != null)
-                        {
-                            await UnpIO_UnpWriteAsync(OutMem, 0, BlockLength, cancellationToken)
-                                .ConfigureAwait(false);
-                            WrittenFileSize += BlockLength;
-                        }
-
-                        WrittenBorder = BlockEnd;
-                        WriteSizeLeft = (UnpPtr - WrittenBorder) & MaxWinMask;
-                    }
-                }
-                else
-                {
-                    NotAllFiltersProcessed = true;
-                    for (var J = I; J < Filters.Count; J++)
-                    {
-                        var fltj = Filters[J];
-                        if (
-                            fltj.Type != FILTER_NONE
-                            && fltj.NextWindow == false
-                            && ((fltj.BlockStart - WrPtr) & MaxWinMask) < FullWriteSize
-                        )
-                        {
-                            fltj.NextWindow = true;
-                        }
-                    }
-                    break;
-                }
-            }
-        }
-
-        var EmptyCount = 0;
-        for (var I = 0; I < Filters.Count; I++)
-        {
-            if (EmptyCount > 0)
-            {
-                Filters[I - EmptyCount] = Filters[I];
-            }
-
-            if (Filters[I].Type == FILTER_NONE)
-            {
-                EmptyCount++;
-            }
-        }
-        if (EmptyCount > 0)
-        {
-            Filters.RemoveRange(Filters.Count - EmptyCount, EmptyCount);
-        }
-
-        if (!NotAllFiltersProcessed)
-        {
-            await UnpWriteAreaAsync(WrittenBorder, UnpPtr, cancellationToken).ConfigureAwait(false);
-            WrPtr = UnpPtr;
-        }
-
-        WriteBorder = (UnpPtr + Math.Min(MaxWinSize, UNPACK_MAX_WRITE)) & MaxWinMask;
-
-        if (
-            WriteBorder == UnpPtr
-            || WrPtr != UnpPtr
-                && ((WrPtr - UnpPtr) & MaxWinMask) < ((WriteBorder - UnpPtr) & MaxWinMask)
-        )
-        {
-            WriteBorder = WrPtr;
-        }
-    }
-
     private byte[] ApplyFilter(byte[] __d, uint DataSize, UnpackFilter Flt)
     {
         var Data = 0;
@@ -1041,48 +651,6 @@ internal partial class Unpack
         }
     }
 
-    private async System.Threading.Tasks.Task UnpWriteAreaAsync(
-        size_t StartPtr,
-        size_t EndPtr,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (EndPtr != StartPtr)
-        {
-            UnpSomeRead = true;
-        }
-
-        if (EndPtr < StartPtr)
-        {
-            UnpAllBuf = true;
-        }
-
-        if (Fragmented)
-        {
-            var SizeToWrite = (EndPtr - StartPtr) & MaxWinMask;
-            while (SizeToWrite > 0)
-            {
-                var BlockSize = FragWindow.GetBlockSize(StartPtr, SizeToWrite);
-                FragWindow.GetBuffer(StartPtr, out var __buffer, out var __offset);
-                await UnpWriteDataAsync(__buffer, __offset, BlockSize, cancellationToken)
-                    .ConfigureAwait(false);
-                SizeToWrite -= BlockSize;
-                StartPtr = (StartPtr + BlockSize) & MaxWinMask;
-            }
-        }
-        else if (EndPtr < StartPtr)
-        {
-            await UnpWriteDataAsync(Window, StartPtr, MaxWinSize - StartPtr, cancellationToken)
-                .ConfigureAwait(false);
-            await UnpWriteDataAsync(Window, 0, EndPtr, cancellationToken).ConfigureAwait(false);
-        }
-        else
-        {
-            await UnpWriteDataAsync(Window, StartPtr, EndPtr - StartPtr, cancellationToken)
-                .ConfigureAwait(false);
-        }
-    }
-
     private void UnpWriteData(byte[] Data, size_t offset, size_t Size)
     {
         if (WrittenFileSize >= DestUnpSize)
@@ -1101,29 +669,6 @@ internal partial class Unpack
         WrittenFileSize += Size;
     }
 
-    private async System.Threading.Tasks.Task UnpWriteDataAsync(
-        byte[] Data,
-        size_t offset,
-        size_t Size,
-        System.Threading.CancellationToken cancellationToken = default
-    )
-    {
-        if (WrittenFileSize >= DestUnpSize)
-        {
-            return;
-        }
-
-        var WriteSize = Size;
-        var LeftToWrite = DestUnpSize - WrittenFileSize;
-        if (WriteSize > LeftToWrite)
-        {
-            WriteSize = (size_t)LeftToWrite;
-        }
-
-        await UnpIO_UnpWriteAsync(Data, offset, WriteSize, cancellationToken).ConfigureAwait(false);
-        WrittenFileSize += Size;
-    }
-
     private void UnpInitData50(bool Solid)
     {
         if (!Solid)
@@ -1132,9 +677,9 @@ internal partial class Unpack
         }
     }
 
-    private bool ReadBlockHeader(BitInput Inp, ref UnpackBlockHeader Header)
+    private bool ReadBlockHeader(BitInput Inp)
     {
-        Header.HeaderSize = 0;
+        BlockHeader.HeaderSize = 0;
 
         if (!Inp.ExternalBuffer && Inp.InAddr > ReadTop - 7)
         {
@@ -1155,9 +700,9 @@ internal partial class Unpack
             return false;
         }
 
-        Header.HeaderSize = (int)(2 + ByteCount);
+        BlockHeader.HeaderSize = (int)(2 + ByteCount);
 
-        Header.BlockBitSize = (BlockFlags & 7) + 1;
+        BlockHeader.BlockBitSize = (BlockFlags & 7) + 1;
 
         var SavedCheckSum = (byte)(Inp.fgetbits() >> 8);
         Inp.faddbits(8);
@@ -1169,28 +714,24 @@ internal partial class Unpack
             Inp.addbits(8);
         }
 
-        Header.BlockSize = BlockSize;
+        BlockHeader.BlockSize = BlockSize;
         var CheckSum = (byte)(0x5a ^ BlockFlags ^ BlockSize ^ (BlockSize >> 8) ^ (BlockSize >> 16));
         if (CheckSum != SavedCheckSum)
         {
             return false;
         }
 
-        Header.BlockStart = Inp.InAddr;
-        ReadBorder = Math.Min(ReadBorder, Header.BlockStart + Header.BlockSize - 1);
+        BlockHeader.BlockStart = Inp.InAddr;
+        ReadBorder = Math.Min(ReadBorder, BlockHeader.BlockStart + BlockHeader.BlockSize - 1);
 
-        Header.LastBlockInFile = (BlockFlags & 0x40) != 0;
-        Header.TablePresent = (BlockFlags & 0x80) != 0;
+        BlockHeader.LastBlockInFile = (BlockFlags & 0x40) != 0;
+        BlockHeader.TablePresent = (BlockFlags & 0x80) != 0;
         return true;
     }
 
-    private bool ReadTables(
-        BitInput Inp,
-        ref UnpackBlockHeader Header,
-        ref UnpackBlockTables Tables
-    )
+    private bool ReadTables(BitInput Inp)
     {
-        if (!Header.TablePresent)
+        if (!BlockHeader.TablePresent)
         {
             return true;
         }
@@ -1233,7 +774,7 @@ internal partial class Unpack
             }
         }
 
-        MakeDecodeTables(BitLength, 0, Tables.BD, BC);
+        MakeDecodeTables(BitLength, 0, BlockTables.BD, BC);
 
         Span<byte> Table = stackalloc byte[checked((int)HUFF_TABLE_SIZE)];
         const int TableSize = checked((int)HUFF_TABLE_SIZE);
@@ -1247,7 +788,7 @@ internal partial class Unpack
                 }
             }
 
-            var Number = DecodeNumber(Inp, Tables.BD);
+            var Number = DecodeNumber(Inp, BlockTables.BD);
             if (Number < 16)
             {
                 Table[I] = (byte)Number;
@@ -1309,10 +850,10 @@ internal partial class Unpack
             return false;
         }
 
-        MakeDecodeTables(Table, 0, Tables.LD, NC);
-        MakeDecodeTables(Table, (int)NC, Tables.DD, DC);
-        MakeDecodeTables(Table, (int)(NC + DC), Tables.LDD, LDC);
-        MakeDecodeTables(Table, (int)(NC + DC + LDC), Tables.RD, RC);
+        MakeDecodeTables(Table, 0, BlockTables.LD, NC);
+        MakeDecodeTables(Table, (int)NC, BlockTables.DD, DC);
+        MakeDecodeTables(Table, (int)(NC + DC), BlockTables.LDD, LDC);
+        MakeDecodeTables(Table, (int)(NC + DC + LDC), BlockTables.RD, RC);
         return true;
     }
 

src/SharpCompress/Compressors/Rar/UnpackV2017/Unpack.unpack_cpp.cs

@@ -2,6 +2,8 @@
 
 using System;
 using System.Buffers;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using static SharpCompress.Compressors.Rar.UnpackV2017.PackDef;
 using static SharpCompress.Compressors.Rar.UnpackV2017.UnpackGlobal;
@@ -196,10 +198,10 @@ internal sealed partial class Unpack : BitInput
         }
     }
 
-    private async System.Threading.Tasks.Task DoUnpackAsync(
+    private async Task DoUnpackAsync(
         uint Method,
         bool Solid,
-        System.Threading.CancellationToken cancellationToken = default
+        CancellationToken cancellationToken = default
     )
     {
         // Methods <50 will crash in Fragmented mode when accessing NULL Window.

src/SharpCompress/Factories/GZipFactory.cs

@@ -63,12 +63,26 @@ public class GZipFactory
         GZipArchive.OpenArchive(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
+    }
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
+    }
 
     #endregion
 

src/SharpCompress/Factories/LzwFactory.cs

@@ -87,7 +87,7 @@ public class LzwFactory : Factory, IReaderFactory
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return new(LzwReader.OpenAsyncReader(stream, options));
+        return LzwReader.OpenAsyncReader(stream, options);
     }
 
     #endregion

src/SharpCompress/Factories/RarFactory.cs

@@ -54,16 +54,30 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
         RarArchive.OpenArchive(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
+    }
 
     /// <inheritdoc/>
     public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         RarArchive.OpenArchive(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
+    }
 
     #endregion
 

src/SharpCompress/Factories/SevenZipFactory.cs

@@ -49,16 +49,30 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
         SevenZipArchive.OpenArchive(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        SevenZipArchive.OpenAsyncArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
+    }
 
     /// <inheritdoc/>
     public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.OpenArchive(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        SevenZipArchive.OpenAsyncArchive(fileInfo, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
+    }
 
     #endregion
 
@@ -74,7 +88,7 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IAsyncArchive OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
         ReaderOptions? readerOptions = null
-    ) => SevenZipArchive.OpenAsyncArchive(streams, readerOptions);
+    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
 
     /// <inheritdoc/>
     public IArchive OpenArchive(
@@ -86,7 +100,7 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IAsyncArchive OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null
-    ) => SevenZipArchive.OpenAsyncArchive(fileInfos, readerOptions);
+    ) => (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
 
     #endregion
 

src/SharpCompress/Factories/TarFactory.cs

@@ -109,6 +109,51 @@ public class TarFactory
 
     #endregion
 
+    public static CompressionType GetCompressionType(Stream stream)
+    {
+        stream.Seek(0, SeekOrigin.Begin);
+        foreach (var wrapper in TarWrapper.Wrappers)
+        {
+            stream.Seek(0, SeekOrigin.Begin);
+            if (wrapper.IsMatch(stream))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                var decompressedStream = wrapper.CreateStream(stream);
+                if (TarArchive.IsTarFile(decompressedStream))
+                {
+                    return wrapper.CompressionType;
+                }
+            }
+        }
+        throw new InvalidFormatException("Not a tar file.");
+    }
+
+    public static async ValueTask<CompressionType> GetCompressionTypeAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        stream.Seek(0, SeekOrigin.Begin);
+        foreach (var wrapper in TarWrapper.Wrappers)
+        {
+            stream.Seek(0, SeekOrigin.Begin);
+            if (wrapper.IsMatch(stream))
+            {
+                stream.Seek(0, SeekOrigin.Begin);
+                var decompressedStream = wrapper.CreateStream(stream);
+                if (
+                    await TarArchive
+                        .IsTarFileAsync(decompressedStream, cancellationToken)
+                        .ConfigureAwait(false)
+                )
+                {
+                    return wrapper.CompressionType;
+                }
+            }
+        }
+        throw new InvalidFormatException("Not a tar file.");
+    }
+
     #region IArchiveFactory
 
     /// <inheritdoc/>
@@ -116,16 +161,28 @@ public class TarFactory
         TarArchive.OpenArchive(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public async ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) =>
+        await TarArchive
+            .OpenAsyncArchive(stream, readerOptions, cancellationToken)
+            .ConfigureAwait(false);
 
     /// <inheritdoc/>
     public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         TarArchive.OpenArchive(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
+    public async ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) =>
+        await TarArchive
+            .OpenAsyncArchive(fileInfo, readerOptions, cancellationToken)
+            .ConfigureAwait(false);
 
     #endregion
 

src/SharpCompress/Factories/ZipFactory.cs

@@ -127,16 +127,30 @@ public class ZipFactory
         ZipArchive.OpenArchive(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
+    }
 
     /// <inheritdoc/>
     public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         ZipArchive.OpenArchive(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsyncArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
+    }
 
     #endregion
 

src/SharpCompress/Readers/Ace/AceReader.Factory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 
 namespace SharpCompress.Readers.Ace;
@@ -33,15 +35,25 @@ public partial class AceReader
         return new MultiVolumeAceReader(streams, options ?? new ReaderOptions());
     }
 
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
     {
+        cancellationToken.ThrowIfCancellationRequested();
         path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
     }
 
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
     {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
     }
 
     public static IAsyncReader OpenAsyncReader(
@@ -53,12 +65,14 @@ public partial class AceReader
         return new MultiVolumeAceReader(streams, options ?? new ReaderOptions());
     }
 
-    public static IAsyncReader OpenAsyncReader(
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

src/SharpCompress/Readers/Arc/ArcReader.Factory.cs

@@ -1,28 +1,42 @@
 #if NET8_0_OR_GREATER
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 
 namespace SharpCompress.Readers.Arc;
 
 public partial class ArcReader : IReaderOpenable
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

src/SharpCompress/Readers/Arj/ArjReader.Factory.cs

@@ -1,28 +1,42 @@
 #if NET8_0_OR_GREATER
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 
 namespace SharpCompress.Readers.Arj;
 
 public partial class ArjReader : IReaderOpenable
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

src/SharpCompress/Readers/GZip/GZipReader.Factory.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Readers.GZip;
 
@@ -7,23 +9,35 @@ public partial class GZipReader
     : IReaderOpenable
 #endif
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

src/SharpCompress/Readers/IReaderFactory.cs

@@ -9,18 +9,18 @@ public interface IReaderFactory : Factories.IFactory
     /// <summary>
     /// Opens a Reader for Non-seeking usage.
     /// </summary>
-    /// <param name="stream"></param>
-    /// <param name="options"></param>
-    /// <returns></returns>
+    /// <param name="stream">An open, readable stream.</param>
+    /// <param name="options">Reader options.</param>
+    /// <returns>The opened reader.</returns>
     IReader OpenReader(Stream stream, ReaderOptions? options);
 
     /// <summary>
     /// Opens a Reader for Non-seeking usage asynchronously.
     /// </summary>
-    /// <param name="stream"></param>
-    /// <param name="options"></param>
-    /// <param name="cancellationToken"></param>
-    /// <returns></returns>
+    /// <param name="stream">An open, readable stream.</param>
+    /// <param name="options">Reader options.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>A <see cref="ValueTask{TResult}"/> containing the opened async reader.</returns>
     ValueTask<IAsyncReader> OpenAsyncReader(
         Stream stream,
         ReaderOptions? options,

src/SharpCompress/Readers/IReaderOpenable.cs

@@ -1,6 +1,7 @@
 #if NET8_0_OR_GREATER
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Readers;
 
@@ -15,19 +16,22 @@ public interface IReaderOpenable
 
     public static abstract IReader OpenReader(Stream stream, ReaderOptions? readerOptions = null);
 
-    public static abstract IAsyncReader OpenAsyncReader(
+    public static abstract ValueTask<IAsyncReader> OpenAsyncReader(
         string path,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
-    public static abstract IAsyncReader OpenAsyncReader(
+    public static abstract ValueTask<IAsyncReader> OpenAsyncReader(
         Stream stream,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
-    public static abstract IAsyncReader OpenAsyncReader(
+    public static abstract ValueTask<IAsyncReader> OpenAsyncReader(
         FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 }
 #endif

src/SharpCompress/Readers/Lzw/LzwReader.Factory.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Readers.Lzw;
 
@@ -7,23 +9,35 @@ public partial class LzwReader
     : IReaderOpenable
 #endif
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

src/SharpCompress/Readers/Rar/RarReader.Factory.cs

@@ -1,28 +1,42 @@
 #if NET8_0_OR_GREATER
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 
 namespace SharpCompress.Readers.Rar;
 
 public partial class RarReader : IReaderOpenable
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 }
 #endif

src/SharpCompress/Readers/ReaderFactory.cs

@@ -1,8 +1,6 @@
 using System;
 using System.IO;
 using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Factories;
 using SharpCompress.IO;

src/SharpCompress/Readers/Tar/TarReader.Async.cs

@@ -1,16 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
-using SharpCompress.Archives.GZip;
-using SharpCompress.Archives.Tar;
-using SharpCompress.Common;
 using SharpCompress.Common.Tar;
-using SharpCompress.Compressors;
-using SharpCompress.Compressors.BZip2;
-using SharpCompress.Compressors.Deflate;
-using SharpCompress.Compressors.LZMA;
-using SharpCompress.Compressors.Lzw;
-using SharpCompress.Compressors.Xz;
-using SharpCompress.Compressors.ZStandard;
 using SharpCompress.IO;
 
 namespace SharpCompress.Readers.Tar;

src/SharpCompress/Readers/Tar/TarReader.Factory.cs

@@ -1,5 +1,15 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Archives.GZip;
+using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
+using SharpCompress.Compressors;
+using SharpCompress.Compressors.BZip2;
+using SharpCompress.Compressors.Deflate;
+using SharpCompress.Compressors.LZMA;
+using SharpCompress.Compressors.ZStandard;
+using SharpCompress.IO;
 
 namespace SharpCompress.Readers.Tar;
 
@@ -8,23 +18,117 @@ public partial class TarReader
     : IReaderOpenable
 #endif
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        path.NotNullOrEmpty(nameof(path));
+        return OpenAsyncReader(new FileInfo(path), readerOptions, cancellationToken);
+    }
+
+    public static async ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        stream.NotNull(nameof(stream));
+        options ??= new ReaderOptions();
+        var sharpCompressStream = SharpCompressStream.Create(
+            stream,
+            bufferSize: options.RewindableBufferSize
+        );
+        long pos = sharpCompressStream.Position;
+        if (
+            await GZipArchive
+                .IsGZipFileAsync(sharpCompressStream, cancellationToken)
+                .ConfigureAwait(false)
+        )
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new GZipStream(sharpCompressStream, CompressionMode.Decompress);
+            if (
+                await TarArchive.IsTarFileAsync(testStream, cancellationToken).ConfigureAwait(false)
+            )
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.GZip);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (
+            await BZip2Stream
+                .IsBZip2Async(sharpCompressStream, cancellationToken)
+                .ConfigureAwait(false)
+        )
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = BZip2Stream.Create(
+                sharpCompressStream,
+                CompressionMode.Decompress,
+                false
+            );
+            if (
+                await TarArchive.IsTarFileAsync(testStream, cancellationToken).ConfigureAwait(false)
+            )
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.BZip2);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (
+            await ZStandardStream
+                .IsZStandardAsync(sharpCompressStream, cancellationToken)
+                .ConfigureAwait(false)
+        )
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new ZStandardStream(sharpCompressStream);
+            if (
+                await TarArchive.IsTarFileAsync(testStream, cancellationToken).ConfigureAwait(false)
+            )
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.ZStandard);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (
+            await LZipStream
+                .IsLZipFileAsync(sharpCompressStream, cancellationToken)
+                .ConfigureAwait(false)
+        )
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new LZipStream(sharpCompressStream, CompressionMode.Decompress);
+            if (
+                await TarArchive.IsTarFileAsync(testStream, cancellationToken).ConfigureAwait(false)
+            )
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.LZip);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        return new TarReader(sharpCompressStream, options, CompressionType.None);
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        readerOptions ??= new ReaderOptions() { LeaveStreamOpen = false };
+        return OpenAsyncReader(fileInfo.OpenRead(), readerOptions, cancellationToken);
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)
@@ -36,6 +140,77 @@ public partial class TarReader
     public static IReader OpenReader(FileInfo fileInfo, ReaderOptions? readerOptions = null)
     {
         fileInfo.NotNull(nameof(fileInfo));
+        readerOptions ??= new ReaderOptions() { LeaveStreamOpen = false };
         return OpenReader(fileInfo.OpenRead(), readerOptions);
     }
+
+    /// <summary>
+    /// Opens a TarReader for Non-seeking usage with a single volume
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="options"></param>
+    /// <returns></returns>
+    public static IReader OpenReader(Stream stream, ReaderOptions? options = null)
+    {
+        stream.NotNull(nameof(stream));
+        options ??= new ReaderOptions();
+        var sharpCompressStream = SharpCompressStream.Create(
+            stream,
+            bufferSize: options.RewindableBufferSize
+        );
+        long pos = sharpCompressStream.Position;
+        if (GZipArchive.IsGZipFile(sharpCompressStream))
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new GZipStream(sharpCompressStream, CompressionMode.Decompress);
+            if (TarArchive.IsTarFile(testStream))
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.GZip);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (BZip2Stream.IsBZip2(sharpCompressStream))
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = BZip2Stream.Create(
+                sharpCompressStream,
+                CompressionMode.Decompress,
+                false
+            );
+            if (TarArchive.IsTarFile(testStream))
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.BZip2);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (ZStandardStream.IsZStandard(sharpCompressStream))
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new ZStandardStream(sharpCompressStream);
+            if (TarArchive.IsTarFile(testStream))
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.ZStandard);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        if (LZipStream.IsLZipFile(sharpCompressStream))
+        {
+            sharpCompressStream.Position = pos;
+            var testStream = new LZipStream(sharpCompressStream, CompressionMode.Decompress);
+            if (TarArchive.IsTarFile(testStream))
+            {
+                sharpCompressStream.Position = pos;
+                return new TarReader(sharpCompressStream, options, CompressionType.LZip);
+            }
+            throw new InvalidFormatException("Not a tar file.");
+        }
+        sharpCompressStream.Position = pos;
+        return new TarReader(sharpCompressStream, options, CompressionType.None);
+    }
 }

src/SharpCompress/Readers/Tar/TarReader.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using SharpCompress.Archives.GZip;
-using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
 using SharpCompress.Common.Tar;
 using SharpCompress.Compressors;
@@ -45,80 +43,6 @@ public partial class TarReader : AbstractReader<TarEntry, TarVolume>
         };
     }
 
-    #region OpenReader
-
-    /// <summary>
-    /// Opens a TarReader for Non-seeking usage with a single volume
-    /// </summary>
-    /// <param name="stream"></param>
-    /// <param name="options"></param>
-    /// <returns></returns>
-    public static IReader OpenReader(Stream stream, ReaderOptions? options = null)
-    {
-        stream.NotNull(nameof(stream));
-        options = options ?? new ReaderOptions();
-        var sharpCompressStream = SharpCompressStream.Create(
-            stream,
-            bufferSize: options.RewindableBufferSize
-        );
-        long pos = sharpCompressStream.Position;
-        if (GZipArchive.IsGZipFile(sharpCompressStream))
-        {
-            sharpCompressStream.Position = pos;
-            var testStream = new GZipStream(sharpCompressStream, CompressionMode.Decompress);
-            if (TarArchive.IsTarFile(testStream))
-            {
-                sharpCompressStream.Position = pos;
-                return new TarReader(sharpCompressStream, options, CompressionType.GZip);
-            }
-            throw new InvalidFormatException("Not a tar file.");
-        }
-        sharpCompressStream.Position = pos;
-        if (BZip2Stream.IsBZip2(sharpCompressStream))
-        {
-            sharpCompressStream.Position = pos;
-            var testStream = BZip2Stream.Create(
-                sharpCompressStream,
-                CompressionMode.Decompress,
-                false
-            );
-            if (TarArchive.IsTarFile(testStream))
-            {
-                sharpCompressStream.Position = pos;
-                return new TarReader(sharpCompressStream, options, CompressionType.BZip2);
-            }
-            throw new InvalidFormatException("Not a tar file.");
-        }
-        sharpCompressStream.Position = pos;
-        if (ZStandardStream.IsZStandard(sharpCompressStream))
-        {
-            sharpCompressStream.Position = pos;
-            var testStream = new ZStandardStream(sharpCompressStream);
-            if (TarArchive.IsTarFile(testStream))
-            {
-                sharpCompressStream.Position = pos;
-                return new TarReader(sharpCompressStream, options, CompressionType.ZStandard);
-            }
-            throw new InvalidFormatException("Not a tar file.");
-        }
-        sharpCompressStream.Position = pos;
-        if (LZipStream.IsLZipFile(sharpCompressStream))
-        {
-            sharpCompressStream.Position = pos;
-            var testStream = new LZipStream(sharpCompressStream, CompressionMode.Decompress);
-            if (TarArchive.IsTarFile(testStream))
-            {
-                sharpCompressStream.Position = pos;
-                return new TarReader(sharpCompressStream, options, CompressionType.LZip);
-            }
-            throw new InvalidFormatException("Not a tar file.");
-        }
-        sharpCompressStream.Position = pos;
-        return new TarReader(sharpCompressStream, options, CompressionType.None);
-    }
-
-    #endregion OpenReader
-
     protected override IEnumerable<TarEntry> GetEntries(Stream stream) =>
         TarEntry.GetEntries(
             StreamingMode.Streaming,
@@ -127,6 +51,4 @@ public partial class TarReader : AbstractReader<TarEntry, TarVolume>
             Options.ArchiveEncoding,
             Options
         );
-
-    // GetEntriesAsync moved to TarReader.Async.cs
 }

src/SharpCompress/Readers/Zip/ZipReader.Factory.cs

@@ -1,28 +1,42 @@
 #if NET8_0_OR_GREATER
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 
 namespace SharpCompress.Readers.Zip;
 
 public partial class ZipReader : IReaderOpenable
 {
-    public static IAsyncReader OpenAsyncReader(string path, ReaderOptions? readerOptions = null)
-    {
-        path.NotNullOrEmpty(nameof(path));
-        return (IAsyncReader)OpenReader(new FileInfo(path), readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        return (IAsyncReader)OpenReader(stream, readerOptions);
-    }
-
-    public static IAsyncReader OpenAsyncReader(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        string path,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     )
     {
-        return (IAsyncReader)OpenReader(fileInfo, readerOptions);
+        cancellationToken.ThrowIfCancellationRequested();
+        path.NotNullOrEmpty(nameof(path));
+        return new((IAsyncReader)OpenReader(new FileInfo(path), readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(stream, readerOptions));
+    }
+
+    public static ValueTask<IAsyncReader> OpenAsyncReader(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new((IAsyncReader)OpenReader(fileInfo, readerOptions));
     }
 
     public static IReader OpenReader(string filePath, ReaderOptions? readerOptions = null)

tests/SharpCompress.Performance/Benchmarks/GZipBenchmarks.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using SharpCompress.Compressors;
 using SharpCompress.Compressors.Deflate;
@@ -36,6 +37,14 @@ public class GZipBenchmarks
         gzipStream.Write(_sourceData, 0, _sourceData.Length);
     }
 
+    [Benchmark(Description = "GZip: Compress 100KB (Async)")]
+    public async Task GZipCompressAsync()
+    {
+        using var outputStream = new MemoryStream();
+        using var gzipStream = new GZipStream(outputStream, CompressionMode.Compress);
+        await gzipStream.WriteAsync(_sourceData, 0, _sourceData.Length).ConfigureAwait(false);
+    }
+
     [Benchmark(Description = "GZip: Decompress 100KB")]
     public void GZipDecompress()
     {
@@ -43,4 +52,12 @@ public class GZipBenchmarks
         using var gzipStream = new GZipStream(inputStream, CompressionMode.Decompress);
         gzipStream.CopyTo(Stream.Null);
     }
+
+    [Benchmark(Description = "GZip: Decompress 100KB (Async)")]
+    public async Task GZipDecompressAsync()
+    {
+        using var inputStream = new MemoryStream(_compressedData);
+        using var gzipStream = new GZipStream(inputStream, CompressionMode.Decompress);
+        await gzipStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+    }
 }

tests/SharpCompress.Performance/Benchmarks/RarBenchmarks.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using SharpCompress.Archives.Rar;
 using SharpCompress.Readers;
@@ -30,6 +31,18 @@ public class RarBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Rar: Extract all entries (Archive API, Async)")]
+    public async Task RarExtractArchiveApiAsync()
+    {
+        using var stream = new MemoryStream(_rarBytes);
+        await using var archive = RarArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
     [Benchmark(Description = "Rar: Extract all entries (Reader API)")]
     public void RarExtractReaderApi()
     {
@@ -43,4 +56,18 @@ public class RarBenchmarks : ArchiveBenchmarkBase
             }
         }
     }
+
+    [Benchmark(Description = "Rar: Extract all entries (Reader API, Async)")]
+    public async Task RarExtractReaderApiAsync()
+    {
+        using var stream = new MemoryStream(_rarBytes);
+        await using var reader = await ReaderFactory.OpenAsyncReader(stream).ConfigureAwait(false);
+        while (await reader.MoveToNextEntryAsync().ConfigureAwait(false))
+        {
+            if (!reader.Entry.IsDirectory)
+            {
+                await reader.WriteEntryToAsync(Stream.Null).ConfigureAwait(false);
+            }
+        }
+    }
 }

tests/SharpCompress.Performance/Benchmarks/SevenZipBenchmarks.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using SharpCompress.Archives.SevenZip;
 
@@ -31,6 +32,18 @@ public class SevenZipBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "7Zip LZMA: Extract all entries (Async)")]
+    public async Task SevenZipLzmaExtractAsync()
+    {
+        using var stream = new MemoryStream(_lzmaBytes);
+        await using var archive = SevenZipArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
     [Benchmark(Description = "7Zip LZMA2: Extract all entries")]
     public void SevenZipLzma2Extract()
     {
@@ -42,4 +55,42 @@ public class SevenZipBenchmarks : ArchiveBenchmarkBase
             entryStream.CopyTo(Stream.Null);
         }
     }
+
+    [Benchmark(Description = "7Zip LZMA2: Extract all entries (Async)")]
+    public async Task SevenZipLzma2ExtractAsync()
+    {
+        using var stream = new MemoryStream(_lzma2Bytes);
+        await using var archive = SevenZipArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
+    [Benchmark(Description = "7Zip LZMA2 Reader: Extract all entries")]
+    public void SevenZipLzma2Extract_Reader()
+    {
+        using var stream = new MemoryStream(_lzma2Bytes);
+        using var archive = SevenZipArchive.OpenArchive(stream);
+        using var reader = archive.ExtractAllEntries();
+        foreach (var entry in archive.Entries.Where(e => !e.IsDirectory))
+        {
+            using var entryStream = entry.OpenEntryStream();
+            entryStream.CopyTo(Stream.Null);
+        }
+    }
+
+    [Benchmark(Description = "7Zip LZMA2 Reader: Extract all entries (Async)")]
+    public async Task SevenZipLzma2ExtractAsync_Reader()
+    {
+        using var stream = new MemoryStream(_lzma2Bytes);
+        await using var archive = SevenZipArchive.OpenAsyncArchive(stream);
+        await using var reader = await archive.ExtractAllEntriesAsync();
+        while (await reader.MoveToNextEntryAsync().ConfigureAwait(false))
+        {
+            await using var entryStream = await reader.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
 }

tests/SharpCompress.Performance/Benchmarks/TarBenchmarks.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
@@ -34,6 +35,18 @@ public class TarBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Tar: Extract all entries (Archive API, Async)")]
+    public async Task TarExtractArchiveApiAsync()
+    {
+        using var stream = new MemoryStream(_tarBytes);
+        await using var archive = TarArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
     [Benchmark(Description = "Tar: Extract all entries (Reader API)")]
     public void TarExtractReaderApi()
     {
@@ -48,6 +61,20 @@ public class TarBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Tar: Extract all entries (Reader API, Async)")]
+    public async Task TarExtractReaderApiAsync()
+    {
+        using var stream = new MemoryStream(_tarBytes);
+        await using var reader = await ReaderFactory.OpenAsyncReader(stream).ConfigureAwait(false);
+        while (await reader.MoveToNextEntryAsync().ConfigureAwait(false))
+        {
+            if (!reader.Entry.IsDirectory)
+            {
+                await reader.WriteEntryToAsync(Stream.Null).ConfigureAwait(false);
+            }
+        }
+    }
+
     [Benchmark(Description = "Tar.GZip: Extract all entries")]
     public void TarGzipExtract()
     {
@@ -60,6 +87,18 @@ public class TarBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Tar.GZip: Extract all entries (Async)")]
+    public async Task TarGzipExtractAsync()
+    {
+        using var stream = new MemoryStream(_tarGzBytes);
+        await using var archive = TarArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
     [Benchmark(Description = "Tar: Create archive with small files")]
     public void TarCreateSmallFiles()
     {
@@ -78,4 +117,22 @@ public class TarBenchmarks : ArchiveBenchmarkBase
             writer.Write($"file{i}.txt", entryStream);
         }
     }
+
+    [Benchmark(Description = "Tar: Create archive with small files (Async)")]
+    public async Task TarCreateSmallFilesAsync()
+    {
+        using var outputStream = new MemoryStream();
+        await using var writer = WriterFactory.OpenAsyncWriter(
+            outputStream,
+            ArchiveType.Tar,
+            new WriterOptions(CompressionType.None) { LeaveStreamOpen = true }
+        );
+
+        for (int i = 0; i < 10; i++)
+        {
+            var data = new byte[1024];
+            using var entryStream = new MemoryStream(data);
+            await writer.WriteAsync($"file{i}.txt", entryStream).ConfigureAwait(false);
+        }
+    }
 }

tests/SharpCompress.Performance/Benchmarks/ZipBenchmarks.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 using SharpCompress.Archives.Zip;
 using SharpCompress.Common;
@@ -34,6 +35,18 @@ public class ZipBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Zip: Extract all entries (Archive API, Async)")]
+    public async Task ZipExtractArchiveApiAsync()
+    {
+        using var stream = new MemoryStream(_archiveBytes);
+        await using var archive = ZipArchive.OpenAsyncArchive(stream);
+        await foreach (var entry in archive.EntriesAsync.Where(e => !e.IsDirectory))
+        {
+            await using var entryStream = await entry.OpenEntryStreamAsync().ConfigureAwait(false);
+            await entryStream.CopyToAsync(Stream.Null).ConfigureAwait(false);
+        }
+    }
+
     [Benchmark(Description = "Zip: Extract all entries (Reader API)")]
     public void ZipExtractReaderApi()
     {
@@ -48,6 +61,20 @@ public class ZipBenchmarks : ArchiveBenchmarkBase
         }
     }
 
+    [Benchmark(Description = "Zip: Extract all entries (Reader API, Async)")]
+    public async Task ZipExtractReaderApiAsync()
+    {
+        using var stream = new MemoryStream(_archiveBytes);
+        await using var reader = await ReaderFactory.OpenAsyncReader(stream).ConfigureAwait(false);
+        while (await reader.MoveToNextEntryAsync().ConfigureAwait(false))
+        {
+            if (!reader.Entry.IsDirectory)
+            {
+                await reader.WriteEntryToAsync(Stream.Null).ConfigureAwait(false);
+            }
+        }
+    }
+
     [Benchmark(Description = "Zip: Create archive with small files")]
     public void ZipCreateSmallFiles()
     {
@@ -66,4 +93,22 @@ public class ZipBenchmarks : ArchiveBenchmarkBase
             writer.Write($"file{i}.txt", entryStream);
         }
     }
+
+    [Benchmark(Description = "Zip: Create archive with small files (Async)")]
+    public async Task ZipCreateSmallFilesAsync()
+    {
+        using var outputStream = new MemoryStream();
+        await using var writer = WriterFactory.OpenAsyncWriter(
+            outputStream,
+            ArchiveType.Zip,
+            new WriterOptions(CompressionType.Deflate) { LeaveStreamOpen = true }
+        );
+
+        for (int i = 0; i < 10; i++)
+        {
+            var data = new byte[1024];
+            using var entryStream = new MemoryStream(data);
+            await writer.WriteAsync($"file{i}.txt", entryStream).ConfigureAwait(false);
+        }
+    }
 }

tests/SharpCompress.Performance/Program.cs

@@ -20,10 +20,10 @@ public class Program
         // Default: Run BenchmarkDotNet
         var config = DefaultConfig.Instance.AddJob(
             Job.Default.WithToolchain(InProcessEmitToolchain.Instance)
-                .WithWarmupCount(3) // Minimal warmup iterations for CI
-                .WithIterationCount(10) // Minimal measurement iterations for CI
-                .WithInvocationCount(10)
-                .WithUnrollFactor(1)
+                .WithWarmupCount(5) // Minimal warmup iterations for CI
+                .WithIterationCount(30) // Minimal measurement iterations for CI
+                .WithInvocationCount(30)
+                .WithUnrollFactor(2)
         );
 
         BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args, config);

tests/SharpCompress.Performance/README.md

@@ -5,11 +5,11 @@ This project contains performance benchmarks for SharpCompress using [BenchmarkD
 ## Overview
 
 The benchmarks test all major archive formats supported by SharpCompress:
-- **Zip**: Read (Archive & Reader API) and Write operations
-- **Tar**: Read (Archive & Reader API) and Write operations, including Tar.GZip
-- **Rar**: Read operations (Archive & Reader API)
-- **7Zip**: Read operations for LZMA and LZMA2 compression
-- **GZip**: Compression and decompression
+- **Zip**: Read (Archive & Reader API) and Write operations, each with sync and async variants
+- **Tar**: Read (Archive & Reader API) and Write operations, including Tar.GZip, each with sync and async variants
+- **Rar**: Read operations (Archive & Reader API), each with sync and async variants
+- **7Zip**: Read operations for LZMA and LZMA2 compression, each with sync and async variants
+- **GZip**: Compression and decompression, each with sync and async variants
 
 ## Running Benchmarks
 

tests/SharpCompress.Performance/baseline-results.md

@@ -1,23 +1,49 @@
-| Method                   | Mean       | Error    | StdDev   | Allocated |
-|------------------------- |-----------:|---------:|---------:|----------:|
-| 'GZip: Compress 100KB'   | 3,268.7 μs | 28.50 μs | 16.96 μs |  519.2 KB |
-| 'GZip: Decompress 100KB' |   436.6 μs |  3.23 μs |  1.69 μs |  34.18 KB |
-| Method                                   | Mean     | Error     | StdDev    | Allocated |
-|----------------------------------------- |---------:|----------:|----------:|----------:|
-| 'Rar: Extract all entries (Archive API)' | 2.054 ms | 0.3927 ms | 0.2598 ms |  91.09 KB |
-| 'Rar: Extract all entries (Reader API)'  | 2.235 ms | 0.0253 ms | 0.0132 ms | 149.48 KB |
-| Method                            | Mean     | Error     | StdDev    | Allocated |
-|---------------------------------- |---------:|----------:|----------:|----------:|
-| '7Zip LZMA: Extract all entries'  | 9.124 ms | 2.1930 ms | 1.4505 ms |  272.8 KB |
-| '7Zip LZMA2: Extract all entries' | 7.810 ms | 0.1323 ms | 0.0788 ms | 272.58 KB |
-| Method                                   | Mean      | Error    | StdDev   | Allocated |
-|----------------------------------------- |----------:|---------:|---------:|----------:|
-| 'Tar: Extract all entries (Archive API)' |  56.36 μs | 3.312 μs | 1.971 μs |  16.65 KB |
-| 'Tar: Extract all entries (Reader API)'  | 175.34 μs | 2.616 μs | 1.557 μs | 213.36 KB |
-| 'Tar.GZip: Extract all entries'          |        NA |       NA |       NA |        NA |
-| 'Tar: Create archive with small files'   |  51.38 μs | 2.349 μs | 1.398 μs |   68.7 KB |
-| Method                                   | Mean       | Error    | StdDev   | Gen0     | Allocated  |
-|----------------------------------------- |-----------:|---------:|---------:|---------:|-----------:|
-| 'Zip: Extract all entries (Archive API)' | 1,188.4 μs | 28.62 μs | 14.97 μs |        - |  181.66 KB |
-| 'Zip: Extract all entries (Reader API)'  | 1,137.0 μs |  5.58 μs |  2.92 μs |        - |  123.19 KB |
-| 'Zip: Create archive with small files'   |   258.2 μs |  8.98 μs |  4.70 μs | 100.0000 | 2806.93 KB |
+| Method                      | Mean     | Error    | StdDev   | Allocated |
+|---------------------------- |---------:|---------:|---------:|----------:|
+| SharpCompress_0_44_Original | 581.8 ms | 11.56 ms | 17.65 ms |  48.77 MB |
+| Method              | Mean       | Error     | StdDev    | Median     | Gen0     | Gen1     | Gen2     | Allocated |
+|-------------------- |-----------:|----------:|----------:|-----------:|---------:|---------:|---------:|----------:|
+| ZipArchiveRead      |   959.2 μs |  52.16 μs | 153.78 μs |   928.7 μs |  27.3438 |   5.8594 |        - | 345.75 KB |
+| TarArchiveRead      |   252.1 μs |  20.97 μs |  61.82 μs |   251.9 μs |  12.2070 |   5.8594 |        - | 154.78 KB |
+| TarGzArchiveRead    |   600.9 μs |  19.25 μs |  53.98 μs |   607.8 μs |  16.6016 |   6.8359 |        - | 204.95 KB |
+| TarBz2ArchiveRead   |         NA |        NA |        NA |         NA |       NA |       NA |       NA |        NA |
+| SevenZipArchiveRead | 8,354.4 μs | 273.01 μs | 747.35 μs | 8,093.2 μs | 109.3750 | 109.3750 | 109.3750 | 787.99 KB |
+| RarArchiveRead      | 1,648.6 μs | 131.91 μs | 388.94 μs | 1,617.6 μs |  17.5781 |   5.8594 |        - | 222.62 KB |
+| Method                           | Mean       | Error   | StdDev   | Gen0    | Gen1    | Gen2    | Allocated |
+|--------------------------------- |-----------:|--------:|---------:|--------:|--------:|--------:|----------:|
+| 'GZip: Compress 100KB'           | 3,317.1 μs | 7.15 μs | 10.02 μs | 33.3333 | 33.3333 | 33.3333 | 519.31 KB |
+| 'GZip: Compress 100KB (Async)'   | 3,280.3 μs | 8.30 μs | 11.63 μs | 33.3333 | 33.3333 | 33.3333 | 519.46 KB |
+| 'GZip: Decompress 100KB'         |   432.5 μs | 2.43 μs |  3.56 μs |       - |       - |       - |  33.92 KB |
+| 'GZip: Decompress 100KB (Async)' |   442.8 μs | 1.20 μs |  1.76 μs |       - |       - |       - |  34.24 KB |
+| Method                                          | Mean       | Error     | StdDev    | Gen0     | Gen1     | Gen2     | Allocated  |
+|------------------------------------------------ |-----------:|----------:|----------:|---------:|---------:|---------:|-----------:|
+| 'Rar: Extract all entries (Archive API)'        |   908.2 μs |  12.42 μs |  17.01 μs |        - |        - |        - |   90.68 KB |
+| 'Rar: Extract all entries (Archive API, Async)' | 1,175.4 μs | 118.74 μs | 177.72 μs |        - |        - |        - |   96.09 KB |
+| 'Rar: Extract all entries (Reader API)'         | 1,215.1 μs |   2.26 μs |   3.09 μs |        - |        - |        - |  148.85 KB |
+| 'Rar: Extract all entries (Reader API, Async)'  | 1,592.0 μs |  22.58 μs |  33.10 μs | 500.0000 | 500.0000 | 500.0000 | 4776.76 KB |
+| Method                                           | Mean      | Error     | StdDev    | Gen0     | Gen1     | Gen2     | Allocated  |
+|------------------------------------------------- |----------:|----------:|----------:|---------:|---------:|---------:|-----------:|
+| '7Zip LZMA: Extract all entries'                 |  7.723 ms | 0.0111 ms | 0.0152 ms |  33.3333 |  33.3333 |  33.3333 |  272.68 KB |
+| '7Zip LZMA: Extract all entries (Async)'         | 35.827 ms | 0.0381 ms | 0.0546 ms | 200.0000 |  33.3333 |  33.3333 | 3402.82 KB |
+| '7Zip LZMA2: Extract all entries'                |  7.758 ms | 0.0074 ms | 0.0104 ms |  33.3333 |  33.3333 |  33.3333 |  272.46 KB |
+| '7Zip LZMA2: Extract all entries (Async)'        | 36.317 ms | 0.0345 ms | 0.0506 ms | 200.0000 |  33.3333 |  33.3333 | 3409.72 KB |
+| '7Zip LZMA2 Reader: Extract all entries'         |  7.706 ms | 0.0114 ms | 0.0163 ms |  33.3333 |  33.3333 |  33.3333 |  273.03 KB |
+| '7Zip LZMA2 Reader: Extract all entries (Async)' | 22.951 ms | 0.0973 ms | 0.1426 ms | 100.0000 | 100.0000 | 100.0000 | 2420.81 KB |
+| Method                                          | Mean      | Error    | StdDev   | Gen0    | Gen1    | Gen2    | Allocated |
+|------------------------------------------------ |----------:|---------:|---------:|--------:|--------:|--------:|----------:|
+| 'Tar: Extract all entries (Archive API)'        |  40.82 μs | 0.292 μs | 0.427 μs |       - |       - |       - |  16.36 KB |
+| 'Tar: Extract all entries (Archive API, Async)' | 105.12 μs | 6.183 μs | 9.254 μs |       - |       - |       - |  14.57 KB |
+| 'Tar: Extract all entries (Reader API)'         | 187.89 μs | 1.571 μs | 2.254 μs | 66.6667 | 66.6667 | 66.6667 | 341.24 KB |
+| 'Tar: Extract all entries (Reader API, Async)'  | 229.78 μs | 4.852 μs | 6.802 μs | 66.6667 | 66.6667 | 66.6667 | 376.64 KB |
+| 'Tar.GZip: Extract all entries'                 |        NA |       NA |       NA |      NA |      NA |      NA |        NA |
+| 'Tar.GZip: Extract all entries (Async)'         |        NA |       NA |       NA |      NA |      NA |      NA |        NA |
+| 'Tar: Create archive with small files'          |  46.98 μs | 0.287 μs | 0.394 μs |       - |       - |       - |  68.11 KB |
+| 'Tar: Create archive with small files (Async)'  |  53.14 μs | 0.352 μs | 0.493 μs |       - |       - |       - |  68.11 KB |
+| Method                                          | Mean     | Error    | StdDev   | Gen0     | Gen1    | Allocated  |
+|------------------------------------------------ |---------:|---------:|---------:|---------:|--------:|-----------:|
+| 'Zip: Extract all entries (Archive API)'        | 556.7 μs |  3.38 μs |  4.74 μs |        - |       - |  180.22 KB |
+| 'Zip: Extract all entries (Archive API, Async)' | 615.7 μs | 15.98 μs | 22.92 μs |        - |       - |  125.52 KB |
+| 'Zip: Extract all entries (Reader API)'         | 542.2 μs |  1.10 μs |  1.46 μs |        - |       - |  121.04 KB |
+| 'Zip: Extract all entries (Reader API, Async)'  | 562.8 μs |  2.42 μs |  3.55 μs |        - |       - |  123.34 KB |
+| 'Zip: Create archive with small files'          | 271.1 μs | 12.93 μs | 18.95 μs | 166.6667 | 33.3333 | 2806.28 KB |
+| 'Zip: Create archive with small files (Async)'  | 394.3 μs | 25.59 μs | 36.71 μs | 166.6667 | 33.3333 | 2811.42 KB |

tests/SharpCompress.Test/ArchiveTests.cs

@@ -614,7 +614,7 @@ public class ArchiveTests : ReaderTests
         {
             using (var stream = SharpCompressStream.CreateNonDisposing(File.OpenRead(path)))
             await using (
-                var archive = archiveFactory.OpenAsyncArchive(
+                var archive = await archiveFactory.OpenAsyncArchive(
                     new AsyncOnlyStream(stream),
                     readerOptions
                 )

tests/SharpCompress.Test/GZip/AsyncTests.cs

@@ -72,7 +72,7 @@ public class AsyncTests : TestBase
     public async ValueTask Archive_Entry_Async_Open_Stream()
     {
         var testArchive = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz");
-        await using var archive = GZipArchive.OpenAsyncArchive(
+        await using var archive = await GZipArchive.OpenAsyncArchive(
             new AsyncOnlyStream(File.OpenRead(testArchive))
         );
 
@@ -123,7 +123,7 @@ public class AsyncTests : TestBase
 
         // Verify the archive was created and contains the entry
         Assert.True(File.Exists(outputPath));
-        await using var archive = ZipArchive.OpenAsyncArchive(outputPath);
+        await using var archive = await ZipArchive.OpenAsyncArchive(outputPath);
         Assert.Single(await archive.EntriesAsync.Where(e => !e.IsDirectory).ToListAsync());
     }
 

tests/SharpCompress.Test/GZip/GZipArchiveAsyncTests.cs

@@ -24,7 +24,7 @@ public class GZipArchiveAsyncTests : ArchiveTests
 #else
         await using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz")))
 #endif
-        await using (var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream)))
+        await using (var archive = await GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream)))
         {
             var entry = await archive.EntriesAsync.FirstAsync();
             await entry.WriteToFileAsync(Path.Combine(SCRATCH_FILES_PATH, entry.Key.NotNull()));
@@ -51,7 +51,9 @@ public class GZipArchiveAsyncTests : ArchiveTests
         await using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz")))
 #endif
         {
-            await using (var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream)))
+            await using (
+                var archive = await GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream))
+            )
             {
                 var entry = await archive.EntriesAsync.FirstAsync();
                 await entry.WriteToFileAsync(Path.Combine(SCRATCH_FILES_PATH, entry.Key.NotNull()));
@@ -79,7 +81,7 @@ public class GZipArchiveAsyncTests : ArchiveTests
 #else
         await using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
 #endif
-        await using (var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream)))
+        await using (var archive = await GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream)))
         {
             await Assert.ThrowsAsync<NotSupportedException>(async () =>
                 await archive.AddEntryAsync("jpg\\test.jpg", File.OpenRead(jpg), closeStream: true)
@@ -105,7 +107,9 @@ public class GZipArchiveAsyncTests : ArchiveTests
             inputStream.Position = 0;
         }
 
-        await using var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(inputStream));
+        await using var archive = await GZipArchive.OpenAsyncArchive(
+            new AsyncOnlyStream(inputStream)
+        );
         var archiveEntry = await archive.EntriesAsync.FirstAsync();
 
         MemoryStream tarStream;
@@ -159,7 +163,7 @@ public class GZipArchiveAsyncTests : ArchiveTests
 #else
         await using var stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
 #endif
-        await using var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
+        await using var archive = await GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
         await foreach (var entry in archive.EntriesAsync.Where(entry => !entry.IsDirectory))
         {
             Assert.InRange(entry.Crc, 0L, 0xFFFFFFFFL);
@@ -174,7 +178,7 @@ public class GZipArchiveAsyncTests : ArchiveTests
 #else
         await using var stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
 #endif
-        await using var archive = GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
+        await using var archive = await GZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
         Assert.Equal(archive.Type, ArchiveType.GZip);
     }
 }

tests/SharpCompress.Test/GZip/GZipReaderAsyncTests.cs

@@ -22,7 +22,7 @@ public class GZipReaderAsyncTests : ReaderTests
     {
         //read only as GZip item
         using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
-        await using var reader = GZipReader.OpenAsyncReader(new AsyncOnlyStream(stream));
+        await using var reader = await GZipReader.OpenAsyncReader(new AsyncOnlyStream(stream));
         while (await reader.MoveToNextEntryAsync())
         {
             Assert.NotEqual(0, reader.Entry.Size);

tests/SharpCompress.Test/Rar/RarArchiveAsyncTests.cs

@@ -69,7 +69,7 @@ public class RarArchiveAsyncTests : ArchiveTests
     {
         using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, testArchive)))
         await using (
-            var archive = RarArchive.OpenAsyncArchive(
+            var archive = await RarArchive.OpenAsyncArchive(
                 stream,
                 new ReaderOptions { Password = password, LeaveStreamOpen = true }
             )
@@ -691,7 +691,7 @@ public class RarArchiveAsyncTests : ArchiveTests
     {
         var testFile = "Rar.issue1050.rar";
         using var fileStream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, testFile));
-        await using var archive = RarArchive.OpenAsyncArchive(fileStream);
+        await using var archive = await RarArchive.OpenAsyncArchive(fileStream);
 
         // Extract using archive.WriteToDirectoryAsync without explicit options
         await archive.WriteToDirectoryAsync(SCRATCH_FILES_PATH);

tests/SharpCompress.Test/ReaderTests.cs

@@ -178,7 +178,8 @@ public abstract class ReaderTests : TestBase
         await using (
             var reader = await ReaderFactory.OpenAsyncReader(
                 new AsyncOnlyStream(testStream),
-                options
+                options,
+                cancellationToken
             )
         )
         {

tests/SharpCompress.Test/SevenZip/SevenZipArchiveAsyncTests.cs

@@ -233,7 +233,7 @@ public class SevenZipArchiveAsyncTests : ArchiveTests
         // This test verifies that solid archives iterate entries as contiguous streams
         // rather than recreating the decompression stream for each entry
         var testArchive = Path.Combine(TEST_ARCHIVES_PATH, "7Zip.solid.7z");
-        await using var archive = SevenZipArchive.OpenAsyncArchive(testArchive);
+        await using var archive = await SevenZipArchive.OpenAsyncArchive(testArchive);
         Assert.True(((SevenZipArchive)archive).IsSolid);
 
         await using var reader = await archive.ExtractAllEntriesAsync();
@@ -254,7 +254,7 @@ public class SevenZipArchiveAsyncTests : ArchiveTests
         // This test verifies that the folder stream is reused within each folder
         // and not recreated for each entry in solid archives
         var testArchive = Path.Combine(TEST_ARCHIVES_PATH, "7Zip.solid.7z");
-        await using var archive = SevenZipArchive.OpenAsyncArchive(testArchive);
+        await using var archive = await SevenZipArchive.OpenAsyncArchive(testArchive);
         Assert.True(((SevenZipArchive)archive).IsSolid);
 
         await using var reader = await archive.ExtractAllEntriesAsync();

tests/SharpCompress.Test/Tar/TarArchiveAsyncTests.cs

@@ -55,7 +55,7 @@ public class TarArchiveAsyncTests : ArchiveTests
         // Step 2: check if the written tar file can be read correctly
         var unmodified = Path.Combine(SCRATCH2_FILES_PATH, archive);
         await using (
-            var archive2 = TarArchive.OpenAsyncArchive(
+            var archive2 = await TarArchive.OpenAsyncArchive(
                 new AsyncOnlyStream(File.OpenRead(unmodified)),
                 new ReaderOptions() { LeaveStreamOpen = false }
             )
@@ -113,7 +113,7 @@ public class TarArchiveAsyncTests : ArchiveTests
         // Step 2: check if the written tar file can be read correctly
         var unmodified = Path.Combine(SCRATCH2_FILES_PATH, archive);
         await using (
-            var archive2 = TarArchive.OpenAsyncArchive(
+            var archive2 = await TarArchive.OpenAsyncArchive(
                 new AsyncOnlyStream(File.OpenRead(unmodified)),
                 new ReaderOptions() { LeaveStreamOpen = false }
             )
@@ -145,7 +145,7 @@ public class TarArchiveAsyncTests : ArchiveTests
         var scratchPath = Path.Combine(SCRATCH_FILES_PATH, "Tar.tar");
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Tar.noEmptyDirs.tar");
 
-        await using (var archive = TarArchive.CreateAsyncArchive())
+        await using (var archive = await TarArchive.CreateAsyncArchive())
         {
             await archive.AddAllFromDirectoryAsync(ORIGINAL_FILES_PATH);
             var twopt = new TarWriterOptions(CompressionType.None, true)
@@ -165,7 +165,7 @@ public class TarArchiveAsyncTests : ArchiveTests
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Tar.mod.tar");
         var modified = Path.Combine(TEST_ARCHIVES_PATH, "Tar.noEmptyDirs.tar");
 
-        await using (var archive = TarArchive.OpenAsyncArchive(unmodified))
+        await using (var archive = await TarArchive.OpenAsyncArchive(unmodified))
         {
             await archive.AddEntryAsync("jpg\\test.jpg", jpg);
             await archive.SaveToAsync(
@@ -183,7 +183,7 @@ public class TarArchiveAsyncTests : ArchiveTests
         var modified = Path.Combine(TEST_ARCHIVES_PATH, "Tar.mod.tar");
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Tar.noEmptyDirs.tar");
 
-        await using (var archive = TarArchive.OpenAsyncArchive(unmodified))
+        await using (var archive = await TarArchive.OpenAsyncArchive(unmodified))
         {
             var entry = await archive.EntriesAsync.SingleAsync(x =>
                 x.Key.NotNull().EndsWith("jpg", StringComparison.OrdinalIgnoreCase)
@@ -253,7 +253,9 @@ public class TarArchiveAsyncTests : ArchiveTests
         var numberOfEntries = 0;
 
         await using (
-            var archiveFactory = TarArchive.OpenAsyncArchive(new AsyncOnlyStream(memoryStream))
+            var archiveFactory = await ArchiveFactory.OpenAsyncArchive(
+                new AsyncOnlyStream(memoryStream)
+            )
         )
         {
             await foreach (var entry in archiveFactory.EntriesAsync)

tests/SharpCompress.Test/Tar/TarArchiveTests.cs

@@ -7,6 +7,7 @@ using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
 using SharpCompress.Readers;
 using SharpCompress.Readers.Tar;
+using SharpCompress.Test.Mocks;
 using SharpCompress.Writers;
 using SharpCompress.Writers.Tar;
 using Xunit;
@@ -23,6 +24,16 @@ public class TarArchiveTests : ArchiveTests
     [Fact]
     public void TarArchivePathRead() => ArchiveFileRead("Tar.tar");
 
+    [Fact]
+    public void TarArchiveStreamRead_Throws_On_NonSeekable_Stream()
+    {
+        using Stream stream = new ForwardOnlyStream(
+            File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar"))
+        );
+
+        Assert.Throws<ArgumentException>(() => ArchiveFactory.OpenArchive(stream));
+    }
+
     [Fact]
     public void Tar_FileName_Exactly_100_Characters()
     {
@@ -53,7 +64,7 @@ public class TarArchiveTests : ArchiveTests
 
         // Step 2: check if the written tar file can be read correctly
         var unmodified = Path.Combine(SCRATCH2_FILES_PATH, archive);
-        using (var archive2 = TarArchive.OpenArchive(unmodified))
+        using (var archive2 = ArchiveFactory.OpenArchive(unmodified))
         {
             Assert.Equal(1, archive2.Entries.Count());
             Assert.Contains(filename, archive2.Entries.Select(entry => entry.Key));
@@ -72,7 +83,7 @@ public class TarArchiveTests : ArchiveTests
     public void Tar_NonUstarArchiveWithLongNameDoesNotSkipEntriesAfterTheLongOne()
     {
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "very long filename.tar");
-        using var archive = TarArchive.OpenArchive(unmodified);
+        using var archive = ArchiveFactory.OpenArchive(unmodified);
         Assert.Equal(5, archive.Entries.Count());
         Assert.Contains("very long filename/", archive.Entries.Select(entry => entry.Key));
         Assert.Contains(
@@ -119,7 +130,7 @@ public class TarArchiveTests : ArchiveTests
 
         // Step 2: check if the written tar file can be read correctly
         var unmodified = Path.Combine(SCRATCH2_FILES_PATH, archive);
-        using (var archive2 = TarArchive.OpenArchive(unmodified))
+        using (var archive2 = ArchiveFactory.OpenArchive(unmodified))
         {
             Assert.Equal(1, archive2.Entries.Count());
             Assert.Contains(longFilename, archive2.Entries.Select(entry => entry.Key));
@@ -138,7 +149,7 @@ public class TarArchiveTests : ArchiveTests
     public void Tar_UstarArchivePathReadLongName()
     {
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "ustar with long names.tar");
-        using var archive = TarArchive.OpenArchive(unmodified);
+        using var archive = ArchiveFactory.OpenArchive(unmodified);
         Assert.Equal(6, archive.Entries.Count());
         Assert.Contains("Directory/", archive.Entries.Select(entry => entry.Key));
         Assert.Contains(
@@ -285,9 +296,9 @@ public class TarArchiveTests : ArchiveTests
 
         var numberOfEntries = 0;
 
-        using (var archiveFactory = TarArchive.OpenArchive(memoryStream))
+        using (var archive = ArchiveFactory.OpenArchive(memoryStream))
         {
-            foreach (var entry in archiveFactory.Entries)
+            foreach (var entry in archive.Entries)
             {
                 ++numberOfEntries;
 
@@ -308,4 +319,24 @@ public class TarArchiveTests : ArchiveTests
 
         Assert.False(isTar);
     }
+
+    [Fact]
+    public void TarArchiveStreamRead_Autodetect_CompressedTar()
+    {
+        using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
+        using var archive = ArchiveFactory.OpenArchive(stream);
+
+        Assert.Equal(ArchiveType.Tar, archive.Type);
+        Assert.NotEmpty(archive.Entries);
+    }
+
+    [Fact]
+    public void TarReaderStreamRead_Autodetect_CompressedTar()
+    {
+        using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.gz"));
+        using var reader = ReaderFactory.OpenReader(stream);
+
+        Assert.Equal(ArchiveType.Tar, reader.ArchiveType);
+        Assert.True(reader.MoveToNextEntry());
+    }
 }

tests/SharpCompress.Test/Tar/TarReaderAsyncTests.cs

@@ -74,7 +74,7 @@ public class TarReaderAsyncTests : ReaderTests
     public async ValueTask Tar_BZip2_Entry_Stream_Async()
     {
         using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2"));
-        await using var reader = TarReader.OpenAsyncReader(stream);
+        await using var reader = await TarReader.OpenAsyncReader(stream);
         while (await reader.MoveToNextEntryAsync())
         {
             if (!reader.Entry.IsDirectory)
@@ -135,7 +135,7 @@ public class TarReaderAsyncTests : ReaderTests
     public async ValueTask Tar_BZip2_Skip_Entry_Stream_Async()
     {
         using Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2"));
-        await using var reader = TarReader.OpenAsyncReader(stream);
+        await using var reader = await TarReader.OpenAsyncReader(stream);
         var names = new List<string>();
         while (await reader.MoveToNextEntryAsync())
         {

tests/SharpCompress.Test/Zip/ZipArchiveAsyncTests.cs

@@ -126,7 +126,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.noEmptyDirs.zip");
         var modified = Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.mod.zip");
 
-        await using (var archive = ZipArchive.OpenAsyncArchive(unmodified))
+        await using (var archive = await ZipArchive.OpenAsyncArchive(unmodified))
         {
             var entry = await archive.EntriesAsync.SingleAsync(x =>
                 x.Key.NotNull().EndsWith("jpg", StringComparison.OrdinalIgnoreCase)
@@ -151,7 +151,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.mod.zip");
         var modified = Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.noEmptyDirs.zip");
 
-        await using (var archive = ZipArchive.OpenAsyncArchive(unmodified))
+        await using (var archive = await ZipArchive.OpenAsyncArchive(unmodified))
         {
             await archive.AddEntryAsync("jpg\\test.jpg", jpg);
 
@@ -171,7 +171,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
         var scratchPath = Path.Combine(SCRATCH_FILES_PATH, "Zip.deflate.noEmptyDirs.zip");
         var unmodified = Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.noEmptyDirs.zip");
 
-        await using (var archive = (ZipArchive)ZipArchive.CreateAsyncArchive())
+        await using (var archive = (ZipArchive)await ZipArchive.CreateAsyncArchive())
         {
             archive.DeflateCompressionLevel = CompressionLevel.BestSpeed;
             archive.AddAllFromDirectory(ORIGINAL_FILES_PATH);
@@ -191,7 +191,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
     {
         using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.zip")))
         {
-            IAsyncArchive archive = ZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
+            IAsyncArchive archive = await ZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
             try
             {
                 await foreach (var entry in archive.EntriesAsync.Where(entry => !entry.IsDirectory))
@@ -212,7 +212,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
     {
         using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Zip.deflate.zip")))
         {
-            IAsyncArchive archive = ZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
+            IAsyncArchive archive = await ZipArchive.OpenAsyncArchive(new AsyncOnlyStream(stream));
             try
             {
                 await archive.WriteToDirectoryAsync(SCRATCH_FILES_PATH);
@@ -239,7 +239,7 @@ public class ZipArchiveAsyncTests : ArchiveTests
         )
 #endif
         {
-            await using IAsyncArchive archive = ZipArchive.OpenAsyncArchive(
+            await using IAsyncArchive archive = await ZipArchive.OpenAsyncArchive(
                 new AsyncOnlyStream(stream)
             );
             await archive.WriteToDirectoryAsync(SCRATCH_FILES_PATH, progress);