first pass of Open Async

.gitignore

@@ -15,6 +15,7 @@ tests/TestArchives/*/Scratch
 tests/TestArchives/*/Scratch2
 .vs
 tools
+.vscode
 .idea/
 
 .DS_Store

.vscode/extensions.json

@@ -1,9 +0,0 @@
-{
-  "recommendations": [
-    "ms-dotnettools.csdevkit",
-    "ms-dotnettools.csharp",
-    "ms-dotnettools.vscode-dotnet-runtime",
-    "csharpier.csharpier-vscode",
-    "formulahendry.dotnet-test-explorer"
-  ]
-}

.vscode/launch.json

@@ -1,97 +0,0 @@
-{
-  "version": "0.2.0",
-  "configurations": [
-    {
-      "name": "Debug Tests (net10.0)",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Specific Test (net10.0)",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--filter",
-        "FullyQualifiedName~${input:testName}"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Performance Tests",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/tests/SharpCompress.Performance/SharpCompress.Performance.csproj",
-        "--no-build"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Build Script",
-      "type": "coreclr",
-      "request": "launch",
-      "program": "dotnet",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/build/build.csproj",
-        "--",
-        "${input:buildTarget}"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    }
-  ],
-  "inputs": [
-    {
-      "id": "testName",
-      "type": "promptString",
-      "description": "Enter test name or pattern (e.g., TestMethodName or ClassName)",
-      "default": ""
-    },
-    {
-      "id": "buildTarget",
-      "type": "pickString",
-      "description": "Select build target",
-      "options": [
-        "clean",
-        "restore",
-        "build",
-        "test",
-        "format",
-        "publish",
-        "default"
-      ],
-      "default": "build"
-    }
-  ]
-}

.vscode/settings.json

@@ -1,29 +0,0 @@
-{
-  "dotnet.defaultSolution": "SharpCompress.sln",
-  "files.exclude": {
-    "**/bin": true,
-    "**/obj": true
-  },
-  "files.watcherExclude": {
-    "**/bin/**": true,
-    "**/obj/**": true,
-    "**/artifacts/**": true
-  },
-  "search.exclude": {
-    "**/bin": true,
-    "**/obj": true,
-    "**/artifacts": true
-  },
-  "editor.formatOnSave": false,
-  "[csharp]": {
-    "editor.defaultFormatter": "csharpier.csharpier-vscode",
-    "editor.formatOnSave": true,
-    "editor.codeActionsOnSave": {
-      "source.fixAll": "explicit"
-    }
-  },
-  "csharpier.enableDebugLogs": false,
-  "omnisharp.enableRoslynAnalyzers": true,
-  "omnisharp.enableEditorConfigSupport": true,
-  "dotnet-test-explorer.testProjectPath": "tests/**/*.csproj"
-}

.vscode/tasks.json

@@ -1,178 +0,0 @@
-{
-  "version": "2.0.0",
-  "tasks": [
-    {
-      "label": "build",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/SharpCompress.sln",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": {
-        "kind": "build",
-        "isDefault": true
-      }
-    },
-    {
-      "label": "build-release",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/SharpCompress.sln",
-        "-c",
-        "Release",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "build"
-    },
-    {
-      "label": "build-library",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/src/SharpCompress/SharpCompress.csproj",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "build"
-    },
-    {
-      "label": "restore",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "restore",
-        "${workspaceFolder}/SharpCompress.sln"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "clean",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "clean",
-        "${workspaceFolder}/SharpCompress.sln"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "test",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": {
-        "kind": "test",
-        "isDefault": true
-      },
-      "dependsOn": "build"
-    },
-    {
-      "label": "test-net10",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "test",
-      "dependsOn": "build"
-    },
-    {
-      "label": "test-net48",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net48",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "test",
-      "dependsOn": "build"
-    },
-    {
-      "label": "format",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "csharpier",
-        "."
-      ],
-      "problemMatcher": []
-    },
-    {
-      "label": "format-check",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "csharpier",
-        "check",
-        "."
-      ],
-      "problemMatcher": []
-    },
-    {
-      "label": "run-build-script",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/build/build.csproj"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "pack",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "pack",
-        "${workspaceFolder}/src/SharpCompress/SharpCompress.csproj",
-        "-c",
-        "Release",
-        "-o",
-        "${workspaceFolder}/artifacts/"
-      ],
-      "problemMatcher": "$msCompile",
-      "dependsOn": "build-release"
-    },
-    {
-      "label": "performance-tests",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/tests/SharpCompress.Performance/SharpCompress.Performance.csproj",
-        "-c",
-        "Release"
-      ],
-      "problemMatcher": "$msCompile"
-    }
-  ]
-}

AGENTS.md

@@ -49,30 +49,6 @@ SharpCompress is a pure C# compression library supporting multiple archive forma
 - Use `dotnet test` to run tests
 - Solution file: `SharpCompress.sln`
 
-### Directory Structure
-```
-src/SharpCompress/
-  ├── Archives/        # IArchive implementations (Zip, Tar, Rar, 7Zip, GZip)
-  ├── Readers/         # IReader implementations (forward-only)
-  ├── Writers/         # IWriter implementations (forward-only)
-  ├── Compressors/     # Low-level compression streams (BZip2, Deflate, LZMA, etc.)
-  ├── Factories/       # Format detection and factory pattern
-  ├── Common/          # Shared types (ArchiveType, Entry, Options)
-  ├── Crypto/          # Encryption implementations
-  └── IO/              # Stream utilities and wrappers
-
-tests/SharpCompress.Test/
-  ├── Zip/, Tar/, Rar/, SevenZip/, GZip/, BZip2/  # Format-specific tests
-  ├── TestBase.cs      # Base test class with helper methods
-  └── TestArchives/    # Test data (not checked into main test project)
-```
-
-### Factory Pattern
-All format types implement factory interfaces (`IArchiveFactory`, `IReaderFactory`, `IWriterFactory`) for auto-detection:
-- `ReaderFactory.Open()` - Auto-detects format by probing stream
-- `WriterFactory.Open()` - Creates writer for specified `ArchiveType`
-- Factories located in: `src/SharpCompress/Factories/`
-
 ## Nullable Reference Types
 
 - Declare variables non-nullable, and check for `null` at entry points.
@@ -140,18 +116,3 @@ SharpCompress supports multiple archive and compression formats:
 - Use test archives from `tests/TestArchives` directory for consistency.
 - Test stream disposal and `LeaveStreamOpen` behavior.
 - Test edge cases: empty archives, large files, corrupted archives, encrypted archives.
-
-### Test Organization
-- Base class: `TestBase` - Provides `TEST_ARCHIVES_PATH`, `SCRATCH_FILES_PATH`, temp directory management
-- Framework: xUnit with AwesomeAssertions
-- Test archives: `tests/TestArchives/` - Use existing archives, don't create new ones unnecessarily
-- Match naming style of nearby test files
-
-## 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. **Multi-framework differences** - Some features differ between .NET Framework and modern .NET (e.g., Mono.Posix)
-6. **Format detection** - Use `ReaderFactory.Open()` for auto-detection, test with actual archive files

src/SharpCompress/Archives/AbstractArchive.cs

@@ -1,7 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.IO;
 using SharpCompress.Readers;
@@ -12,10 +15,8 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
     where TEntry : IArchiveEntry
     where TVolume : IVolume
 {
-    private readonly LazyReadOnlyCollection<TVolume> _lazyVolumes;
-    private readonly LazyReadOnlyCollection<TEntry> _lazyEntries;
     private bool _disposed;
-    private readonly SourceStream? _sourceStream;
+    protected SourceStream? SourceStream { get; internal set; }
 
     public event EventHandler<ArchiveExtractionEventArgs<IArchiveEntry>>? EntryExtractionBegin;
     public event EventHandler<ArchiveExtractionEventArgs<IArchiveEntry>>? EntryExtractionEnd;
@@ -24,21 +25,24 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
     public event EventHandler<FilePartExtractionBeginEventArgs>? FilePartExtractionBegin;
     protected ReaderOptions ReaderOptions { get; }
 
+    protected Lazy<IReadOnlyCollection<TVolume>> LazyVolumes { get; internal set; }
+    protected Lazy<IReadOnlyCollection<TEntry>> LazyEntries { get; internal set; }
+
     internal AbstractArchive(ArchiveType type, SourceStream sourceStream)
     {
         Type = type;
         ReaderOptions = sourceStream.ReaderOptions;
-        _sourceStream = sourceStream;
-        _lazyVolumes = new LazyReadOnlyCollection<TVolume>(LoadVolumes(_sourceStream));
-        _lazyEntries = new LazyReadOnlyCollection<TEntry>(LoadEntries(Volumes));
+        SourceStream = sourceStream;
+        LazyVolumes = new Lazy<IReadOnlyCollection<TVolume>>(() => LoadVolumes(SourceStream).ToList());
+        LazyEntries = new Lazy<IReadOnlyCollection<TEntry>>(() => LoadEntries(Volumes).ToList());
     }
 
     internal AbstractArchive(ArchiveType type)
     {
         Type = type;
         ReaderOptions = new();
-        _lazyVolumes = new LazyReadOnlyCollection<TVolume>(Enumerable.Empty<TVolume>());
-        _lazyEntries = new LazyReadOnlyCollection<TEntry>(Enumerable.Empty<TEntry>());
+        LazyVolumes = new Lazy<IReadOnlyCollection<TVolume>>(() => Enumerable.Empty<TVolume>().ToList());
+        LazyEntries = new Lazy<IReadOnlyCollection<TEntry>>(() => Enumerable.Empty<TEntry>().ToList());
     }
 
     public ArchiveType Type { get; }
@@ -61,12 +65,12 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
     /// <summary>
     /// Returns an ReadOnlyCollection of all the RarArchiveEntries across the one or many parts of the RarArchive.
     /// </summary>
-    public virtual ICollection<TEntry> Entries => _lazyEntries;
+    public virtual ICollection<TEntry> Entries => LazyEntries.Value;
 
     /// <summary>
     /// Returns an ReadOnlyCollection of all the RarArchiveVolumes across the one or many parts of the RarArchive.
     /// </summary>
-    public ICollection<TVolume> Volumes => _lazyVolumes;
+    public ICollection<TVolume> Volumes => LazyVolumes.Value;
 
     /// <summary>
     /// The total size of the files compressed in the archive.
@@ -82,18 +86,26 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
 
     protected abstract IEnumerable<TVolume> LoadVolumes(SourceStream sourceStream);
     protected abstract IEnumerable<TEntry> LoadEntries(IEnumerable<TVolume> volumes);
+    protected virtual Task<IReadOnlyCollection<TEntry>> LoadEntriesAsync(IEnumerable<TVolume> volumes, CancellationToken cancellationToken)
+    {
+        return Task.FromResult<IReadOnlyCollection<TEntry>>(LoadEntries(volumes).ToList());
+    }
+    protected virtual Task<IReadOnlyCollection<TVolume>> LoadVolumesAsync(SourceStream sourceStream, CancellationToken cancellationToken)
+    {
+        return Task.FromResult<IReadOnlyCollection<TVolume>>(LoadVolumes(sourceStream).ToList());
+    }
 
     IEnumerable<IArchiveEntry> IArchive.Entries => Entries.Cast<IArchiveEntry>();
 
-    IEnumerable<IVolume> IArchive.Volumes => _lazyVolumes.Cast<IVolume>();
+    IEnumerable<IVolume> IArchive.Volumes => LazyVolumes.Value.Cast<IVolume>();
 
     public virtual void Dispose()
     {
         if (!_disposed)
         {
-            _lazyVolumes.ForEach(v => v.Dispose());
-            _lazyEntries.GetLoaded().Cast<Entry>().ForEach(x => x.Close());
-            _sourceStream?.Dispose();
+            LazyVolumes.Value.ForEach(v => v.Dispose());
+            LazyEntries.Value.Cast<Entry>().ForEach(x => x.Close());
+            SourceStream?.Dispose();
 
             _disposed = true;
         }
@@ -101,8 +113,8 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
 
     void IArchiveExtractionListener.EnsureEntriesLoaded()
     {
-        _lazyEntries.EnsureFullyLoaded();
-        _lazyVolumes.EnsureFullyLoaded();
+        LazyEntries.Value.EnsureFullyLoaded();
+        LazyVolumes.Value.EnsureFullyLoaded();
     }
 
     void IExtractionListener.FireCompressedBytesRead(
@@ -161,11 +173,6 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
     /// </summary>
     public virtual bool IsSolid => false;
 
-    /// <summary>
-    /// Archive is ENCRYPTED (this means the Archive has password-protected files).
-    /// </summary>
-    public virtual bool IsEncrypted => false;
-
     /// <summary>
     /// The archive can find all the parts of the archive needed to fully extract the archive.  This forces the parsing of the entire archive.
     /// </summary>

src/SharpCompress/Archives/ArchiveFactory.cs

@@ -2,11 +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.Tar.Headers;
-using SharpCompress.Compressors;
-using SharpCompress.Compressors.BZip2;
-using SharpCompress.Compressors.LZMA;
 using SharpCompress.Factories;
 using SharpCompress.IO;
 using SharpCompress.Readers;
@@ -28,6 +26,25 @@ public static class ArchiveFactory
         return FindFactory<IArchiveFactory>(stream).Open(stream, readerOptions);
     }
 
+    /// <summary>
+    /// Opens an Archive for random access
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    public static async Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        readerOptions ??= new ReaderOptions();
+        stream = SharpCompressStream.Create(stream, bufferSize: readerOptions.BufferSize);
+        var factory = await FindFactoryAsync<IArchiveFactory>(stream, cancellationToken);
+        return await factory.OpenAsync(stream, readerOptions, cancellationToken);
+    }
+
     public static IWritableArchive Create(ArchiveType type)
     {
         var factory = Factory
@@ -53,6 +70,22 @@ public static class ArchiveFactory
         return Open(new FileInfo(filePath), options);
     }
 
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<IArchive> OpenAsync(
+        string filePath,
+        ReaderOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return OpenAsync(new FileInfo(filePath), options, cancellationToken);
+    }
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
@@ -65,6 +98,24 @@ public static class ArchiveFactory
         return FindFactory<IArchiveFactory>(fileInfo).Open(fileInfo, options);
     }
 
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        options ??= new ReaderOptions { LeaveStreamOpen = false };
+
+        var factory = await FindFactoryAsync<IArchiveFactory>(fileInfo, cancellationToken);
+        return await factory.OpenAsync(fileInfo, options, cancellationToken);
+    }
+
     /// <summary>
     /// Constructor with IEnumerable FileInfo objects, multi and split support.
     /// </summary>
@@ -91,6 +142,38 @@ public static class ArchiveFactory
         return FindFactory<IMultiArchiveFactory>(fileInfo).Open(filesArray, options);
     }
 
+    /// <summary>
+    /// Constructor with IEnumerable FileInfo objects, multi and split support.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<IArchive> OpenAsync(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var filesArray = fileInfos.ToArray();
+        if (filesArray.Length == 0)
+        {
+            throw new InvalidOperationException("No files to open");
+        }
+
+        var fileInfo = filesArray[0];
+        if (filesArray.Length == 1)
+        {
+            return await OpenAsync(fileInfo, options, cancellationToken);
+        }
+
+        fileInfo.NotNull(nameof(fileInfo));
+        options ??= new ReaderOptions { LeaveStreamOpen = false };
+
+        var factory = await FindFactoryAsync<IMultiArchiveFactory>(fileInfo, cancellationToken);
+        return await factory.OpenAsync(filesArray, options, cancellationToken);
+    }
+
     /// <summary>
     /// Constructor with IEnumerable FileInfo objects, multi and split support.
     /// </summary>
@@ -117,6 +200,38 @@ public static class ArchiveFactory
         return FindFactory<IMultiArchiveFactory>(firstStream).Open(streamsArray, options);
     }
 
+    /// <summary>
+    /// Constructor with IEnumerable FileInfo objects, multi and split support.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<IArchive> OpenAsync(
+        IEnumerable<Stream> streams,
+        ReaderOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        streams.NotNull(nameof(streams));
+        var streamsArray = streams.ToArray();
+        if (streamsArray.Length == 0)
+        {
+            throw new InvalidOperationException("No streams");
+        }
+
+        var firstStream = streamsArray[0];
+        if (streamsArray.Length == 1)
+        {
+            return await OpenAsync(firstStream, options, cancellationToken);
+        }
+
+        firstStream.NotNull(nameof(firstStream));
+        options ??= new ReaderOptions();
+
+        var factory = await FindFactoryAsync<IMultiArchiveFactory>(firstStream, cancellationToken);
+        return await factory.OpenAsync(streamsArray, options, cancellationToken);
+    }
+
     /// <summary>
     /// Extract to specific directory, retaining filename
     /// </summary>
@@ -130,15 +245,40 @@ public static class ArchiveFactory
         archive.WriteToDirectory(destinationDirectory, options);
     }
 
+    /// <summary>
+    /// Extract to specific directory, retaining filename
+    /// </summary>
+    public static async Task WriteToDirectoryAsync(
+        string sourceArchive,
+        string destinationDirectory,
+        ExtractionOptions? options = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        using var archive = await OpenAsync(sourceArchive, cancellationToken: cancellationToken);
+        await archive.WriteToDirectoryAsync(destinationDirectory, options, cancellationToken);
+    }
+
     private static T FindFactory<T>(FileInfo finfo)
         where T : IFactory
     {
         finfo.NotNull(nameof(finfo));
         using Stream stream = finfo.OpenRead();
-        return FindFactory<T>(stream, finfo.Name);
+        return FindFactory<T>(stream);
     }
 
-    private static T FindFactory<T>(Stream stream, string? fileName = null)
+    private static async Task<T> FindFactoryAsync<T>(
+        FileInfo finfo,
+        CancellationToken cancellationToken
+    )
+        where T : IFactory
+    {
+        finfo.NotNull(nameof(finfo));
+        using Stream stream = finfo.OpenRead();
+        return await FindFactoryAsync<T>(stream, cancellationToken);
+    }
+
+    private static T FindFactory<T>(Stream stream)
         where T : IFactory
     {
         stream.NotNull(nameof(stream));
@@ -163,14 +303,36 @@ public static class ArchiveFactory
             }
         }
 
-        stream.Seek(startPosition, SeekOrigin.Begin);
+        var extensions = string.Join(", ", factories.Select(item => item.Name));
 
-        // Check if this is a compressed tar file (tar.bz2, tar.lz, etc.)
-        // These formats are supported by ReaderFactory but not by ArchiveFactory
-        var compressedTarMessage = TryGetCompressedTarMessage(stream, fileName);
-        if (compressedTarMessage != null)
+        throw new InvalidOperationException(
+            $"Cannot determine compressed stream type. Supported Archive Formats: {extensions}"
+        );
+    }
+
+    private static async Task<T> FindFactoryAsync<T>(Stream stream, CancellationToken cancellationToken)
+        where T : IFactory
+    {
+        stream.NotNull(nameof(stream));
+        if (!stream.CanRead || !stream.CanSeek)
         {
-            throw new InvalidOperationException(compressedTarMessage);
+            throw new ArgumentException("Stream should be readable and seekable");
+        }
+
+        var factories = Factory.Factories.OfType<T>();
+
+        var startPosition = stream.Position;
+
+        foreach (var factory in factories)
+        {
+            stream.Seek(startPosition, SeekOrigin.Begin);
+
+            if (await factory.IsArchiveAsync(stream, cancellationToken).ConfigureAwait(false))
+            {
+                stream.Seek(startPosition, SeekOrigin.Begin);
+
+                return factory;
+            }
         }
 
         var extensions = string.Join(", ", factories.Select(item => item.Name));
@@ -191,6 +353,17 @@ public static class ArchiveFactory
         return IsArchive(s, out type, bufferSize);
     }
 
+    public static async Task<(bool, ArchiveType?)> IsArchiveAsync(
+        string filePath,
+        CancellationToken cancellationToken = default,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    )
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        using Stream s = File.OpenRead(filePath);
+        return await IsArchiveAsync(s, cancellationToken, bufferSize);
+    }
+
     public static bool IsArchive(
         Stream stream,
         out ArchiveType? type,
@@ -222,6 +395,36 @@ public static class ArchiveFactory
         return false;
     }
 
+    public static async Task<(bool, ArchiveType?)> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    )
+    {
+        stream.NotNull(nameof(stream));
+
+        if (!stream.CanRead || !stream.CanSeek)
+        {
+            throw new ArgumentException("Stream should be readable and seekable");
+        }
+
+        var startPosition = stream.Position;
+
+        foreach (var factory in Factory.Factories)
+        {
+            var isArchive = await factory.IsArchiveAsync(stream, cancellationToken)
+                .ConfigureAwait(false);
+            stream.Position = startPosition;
+
+            if (isArchive)
+            {
+                return (true, factory.KnownArchiveType);
+            }
+        }
+
+        return (false, null);
+    }
+
     /// <summary>
     /// From a passed in archive (zip, rar, 7z, 001), return all parts.
     /// </summary>
@@ -262,111 +465,4 @@ public static class ArchiveFactory
     }
 
     public static IArchiveFactory AutoFactory { get; } = new AutoArchiveFactory();
-
-    /// <summary>
-    /// Checks if the stream is a compressed tar file (tar.bz2, tar.lz, etc.) that should use ReaderFactory instead.
-    /// Returns an error message if detected, null otherwise.
-    /// </summary>
-    private static string? TryGetCompressedTarMessage(Stream stream, string? fileName)
-    {
-        var startPosition = stream.Position;
-        try
-        {
-            // Check if it's a BZip2 file
-            if (BZip2Stream.IsBZip2(stream))
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                // Try to decompress and check if it contains a tar archive
-                using var decompressed = new BZip2Stream(stream, CompressionMode.Decompress, true);
-                if (IsTarStream(decompressed))
-                {
-                    return "This appears to be a tar.bz2 archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-                return null;
-            }
-
-            stream.Seek(startPosition, SeekOrigin.Begin);
-
-            // Check if it's an LZip file
-            if (LZipStream.IsLZipFile(stream))
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                // Try to decompress and check if it contains a tar archive
-                using var decompressed = new LZipStream(stream, CompressionMode.Decompress);
-                if (IsTarStream(decompressed))
-                {
-                    return "This appears to be a tar.lz archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-                return null;
-            }
-
-            // Check file extension as a fallback for other compressed tar formats
-            if (fileName != null)
-            {
-                var lowerFileName = fileName.ToLowerInvariant();
-                if (
-                    lowerFileName.EndsWith(".tar.bz2")
-                    || lowerFileName.EndsWith(".tbz")
-                    || lowerFileName.EndsWith(".tbz2")
-                    || lowerFileName.EndsWith(".tb2")
-                    || lowerFileName.EndsWith(".tz2")
-                    || lowerFileName.EndsWith(".tar.lz")
-                    || lowerFileName.EndsWith(".tar.xz")
-                    || lowerFileName.EndsWith(".txz")
-                    || lowerFileName.EndsWith(".tar.zst")
-                    || lowerFileName.EndsWith(".tar.zstd")
-                    || lowerFileName.EndsWith(".tzst")
-                    || lowerFileName.EndsWith(".tzstd")
-                    || lowerFileName.EndsWith(".tar.z")
-                    || lowerFileName.EndsWith(".tz")
-                    || lowerFileName.EndsWith(".taz")
-                )
-                {
-                    return $"The file '{fileName}' appears to be a compressed tar archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-            }
-
-            return null;
-        }
-        catch
-        {
-            // If we can't determine, just return null and let the normal error handling proceed
-            return null;
-        }
-        finally
-        {
-            try
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-            }
-            catch
-            {
-                // Ignore seek failures
-            }
-        }
-    }
-
-    /// <summary>
-    /// Checks if a stream contains a tar archive by trying to read a tar header.
-    /// </summary>
-    private static bool IsTarStream(Stream stream)
-    {
-        try
-        {
-            var tarHeader = new TarHeader(new ArchiveEncoding());
-            return tarHeader.Read(new BinaryReader(stream));
-        }
-        catch
-        {
-            return false;
-        }
-    }
 }

src/SharpCompress/Archives/GZip/GZipArchive.cs

@@ -2,11 +2,13 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.GZip;
 using SharpCompress.IO;
+using SharpCompress.Polyfills;
 using SharpCompress.Readers;
 using SharpCompress.Readers.GZip;
 using SharpCompress.Writers;
@@ -27,6 +29,22 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
     }
 
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<GZipArchive> OpenAsync(
+        string filePath,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return await OpenAsync(new FileInfo(filePath), readerOptions ?? new ReaderOptions(), cancellationToken).ConfigureAwait(false);
+    }
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
@@ -44,6 +62,32 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<GZipArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        var archive = new GZipArchive();
+        archive.SourceStream = new SourceStream(
+            fileInfo,
+            i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<GZipVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<GZipArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Constructor with all file parts passed in
     /// </summary>
@@ -65,6 +109,33 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<GZipArchive> OpenAsync(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        var archive = new GZipArchive();
+        archive.SourceStream = new SourceStream(
+            files[0],
+            i => i < files.Length ? files[i] : null,
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<GZipVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<GZipArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Constructor with all stream parts passed in
     /// </summary>
@@ -83,6 +154,33 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<GZipArchive> OpenAsync(
+        IEnumerable<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        var archive = new GZipArchive();
+        archive.SourceStream = new SourceStream(
+            strms[0],
+            i => i < strms.Length ? strms[i] : null,
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<GZipVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<GZipArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Takes a seekable Stream as a source
     /// </summary>
@@ -102,21 +200,62 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<GZipArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        var archive = new GZipArchive();
+        archive.SourceStream = new SourceStream(stream, _ => null, readerOptions ?? new ReaderOptions());
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<GZipVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<GZipArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     public static GZipArchive Create() => new();
 
     /// <summary>
-    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    * Constructor with a SourceStream able to handle FileInfo and Streams.
     /// </summary>
     /// <param name="sourceStream"></param>
     private GZipArchive(SourceStream sourceStream)
         : base(ArchiveType.GZip, sourceStream) { }
 
+    private GZipArchive()
+        : base(ArchiveType.GZip)
+    {
+        LazyVolumes = new Lazy<IReadOnlyCollection<GZipVolume>>(() => LoadVolumes(SourceStream!).ToList());
+        LazyEntries = new Lazy<IReadOnlyCollection<GZipArchiveEntry>>(() => LoadEntries(Volumes).ToList());
+    }
+
     protected override IEnumerable<GZipVolume> LoadVolumes(SourceStream sourceStream)
     {
         sourceStream.LoadAllParts();
         return sourceStream.Streams.Select(a => new GZipVolume(a, ReaderOptions, 0));
     }
 
+    protected override async Task<IReadOnlyCollection<GZipVolume>> LoadVolumesAsync(SourceStream sourceStream, CancellationToken cancellationToken)
+    {
+        await sourceStream.LoadAllPartsAsync(cancellationToken).ConfigureAwait(false);
+        return sourceStream.Streams.Select(a => new GZipVolume(a, ReaderOptions, 0)).ToList();
+    }
+
     public static bool IsGZipFile(string filePath) => IsGZipFile(new FileInfo(filePath));
 
     public static bool IsGZipFile(FileInfo fileInfo)
@@ -130,6 +269,25 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         return IsGZipFile(stream);
     }
 
+    public static Task<bool> IsGZipFileAsync(
+        string filePath,
+        CancellationToken cancellationToken = default
+    ) => IsGZipFileAsync(new FileInfo(filePath), cancellationToken);
+
+    public static async Task<bool> IsGZipFileAsync(
+        FileInfo fileInfo,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+
+        using Stream stream = fileInfo.OpenRead();
+        return await IsGZipFileAsync(stream, cancellationToken).ConfigureAwait(false);
+    }
+
     public void SaveTo(string filePath) => SaveTo(new FileInfo(filePath));
 
     public void SaveTo(FileInfo fileInfo)
@@ -167,6 +325,28 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         return true;
     }
 
+    public static async Task<bool> IsGZipFileAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        // read the header on the first read
+        byte[] header = new byte[10];
+
+        // workitem 8501: handle edge case (decompress empty stream)
+        if (!await stream.ReadFullyAsync(header, cancellationToken).ConfigureAwait(false))
+        {
+            return false;
+        }
+
+        if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
+        {
+            return false;
+        }
+
+        return true;
+    }
+
     internal GZipArchive()
         : base(ArchiveType.GZip) { }
 
@@ -244,6 +424,17 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    protected override async Task<IReadOnlyCollection<GZipArchiveEntry>> LoadEntriesAsync(IEnumerable<GZipVolume> volumes, CancellationToken cancellationToken)
+    {
+        var list = new List<GZipArchiveEntry>();
+        var stream = volumes.Single().Stream;
+        list.Add(new GZipArchiveEntry(
+            this,
+            new GZipFilePart(stream, ReaderOptions.ArchiveEncoding)
+        ));
+        return list.AsReadOnly();
+    }
+
     protected override IReader CreateReaderForSolidExtraction()
     {
         var stream = Volumes.Single().Stream;
@@ -251,3 +442,4 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         return GZipReader.Open(stream);
     }
 }
+

src/SharpCompress/Archives/IArchiveFactory.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Factories;
 using SharpCompress.Readers;
 
@@ -26,10 +28,34 @@ public interface IArchiveFactory : IFactory
     /// <param name="readerOptions">reading options.</param>
     IArchive Open(Stream stream, ReaderOptions? readerOptions = null);
 
+    /// <summary>
+    /// Opens an Archive for random access.
+    /// </summary>
+    /// <param name="stream">An open, readable and seekable stream.</param>
+    /// <param name="readerOptions">reading options.</param>
+    /// <param name="cancellationToken">the cancellation token.</param>
+    Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
     /// <param name="fileInfo">the file to open.</param>
     /// <param name="readerOptions">reading options.</param>
     IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null);
+
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo">the file to open.</param>
+    /// <param name="readerOptions">reading options.</param>
+    /// <param name="cancellationToken">the cancellation token.</param>
+    Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
 }

src/SharpCompress/Archives/IMultiArchiveFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Factories;
 using SharpCompress.Readers;
 
@@ -27,10 +29,34 @@ public interface IMultiArchiveFactory : IFactory
     /// <param name="readerOptions">reading options.</param>
     IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null);
 
+    /// <summary>
+    /// Constructor with IEnumerable FileInfo objects, multi and split support.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions">reading options.</param>
+    /// <param name="cancellationToken">the cancellation token.</param>
+    Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
+
     /// <summary>
     /// Constructor with IEnumerable Stream objects, multi and split support.
     /// </summary>
     /// <param name="fileInfos"></param>
     /// <param name="readerOptions">reading options.</param>
     IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null);
+
+    /// <summary>
+    /// Constructor with IEnumerable Stream objects, multi and split support.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions">reading options.</param>
+    /// <param name="cancellationToken">the cancellation token.</param>
+    Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    );
 }

src/SharpCompress/Archives/Rar/RarArchive.cs

@@ -2,6 +2,8 @@ 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.Rar;
 using SharpCompress.Common.Rar.Headers;
@@ -84,8 +86,6 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
 
     public override bool IsSolid => Volumes.First().IsSolidArchive;
 
-    public override bool IsEncrypted => Entries.First(x => !x.IsDirectory).IsEncrypted;
-
     public virtual int MinVersion => Volumes.First().MinVersion;
     public virtual int MaxVersion => Volumes.First().MaxVersion;
 
@@ -193,6 +193,24 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
         return IsRarFile(stream);
     }
 
+    public static Task<bool> IsRarFileAsync(
+        string filePath,
+        CancellationToken cancellationToken = default
+    ) => IsRarFileAsync(new FileInfo(filePath), cancellationToken);
+
+    public static async Task<bool> IsRarFileAsync(
+        FileInfo fileInfo,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return await IsRarFileAsync(stream, cancellationToken).ConfigureAwait(false);
+    }
+
     public static bool IsRarFile(Stream stream, ReaderOptions? options = null)
     {
         try
@@ -206,5 +224,23 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
         }
     }
 
+    public static async Task<bool> IsRarFileAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default,
+        ReaderOptions? options = null
+    )
+    {
+        try
+        {
+            await MarkHeader.ReadAsync(stream, true, false, cancellationToken)
+                .ConfigureAwait(false);
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
     #endregion
 }

src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs

@@ -2,10 +2,14 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.SevenZip;
 using SharpCompress.Compressors.LZMA.Utilites;
 using SharpCompress.IO;
+using SharpCompress.Polyfills;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives.SevenZip;
@@ -25,6 +29,18 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
     }
 
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<SevenZipArchive> OpenAsync(
+        string filePath,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
@@ -42,6 +58,18 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         );
     }
 
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<SevenZipArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <summary>
     /// Constructor with all file parts passed in
     /// </summary>
@@ -63,6 +91,18 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         );
     }
 
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<SevenZipArchive> OpenAsync(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <summary>
     /// Constructor with all stream parts passed in
     /// </summary>
@@ -84,6 +124,18 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         );
     }
 
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<SevenZipArchive> OpenAsync(
+        IEnumerable<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <summary>
     /// Takes a seekable Stream as a source
     /// </summary>
@@ -103,6 +155,18 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         );
     }
 
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static Task<SevenZipArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <summary>
     /// Constructor with a SourceStream able to handle FileInfo and Streams.
     /// </summary>
@@ -118,6 +182,11 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
 
     public static bool IsSevenZipFile(string filePath) => IsSevenZipFile(new FileInfo(filePath));
 
+    public static Task<bool> IsSevenZipFileAsync(
+        string filePath,
+        CancellationToken cancellationToken = default
+    ) => IsSevenZipFileAsync(new FileInfo(filePath), cancellationToken);
+
     public static bool IsSevenZipFile(FileInfo fileInfo)
     {
         if (!fileInfo.Exists)
@@ -128,6 +197,19 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         return IsSevenZipFile(stream);
     }
 
+    public static async Task<bool> IsSevenZipFileAsync(
+        FileInfo fileInfo,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return await IsSevenZipFileAsync(stream, cancellationToken).ConfigureAwait(false);
+    }
+
     internal SevenZipArchive()
         : base(ArchiveType.SevenZip) { }
 
@@ -163,6 +245,8 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         return entries;
     }
 
+    protected override Task<IReadOnlyCollection<SevenZipArchiveEntry>> LoadEntriesAsync(IEnumerable<SevenZipVolume> volumes, CancellationToken cancellationToken) => throw new NotImplementedException();
+
     private void LoadFactory(Stream stream)
     {
         if (_database is null)
@@ -174,6 +258,8 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         }
     }
 
+    protected override Task<IReadOnlyCollection<SevenZipVolume>> LoadVolumesAsync(SourceStream sourceStream, CancellationToken cancellationToken) => throw new NotImplementedException();
+
     public static bool IsSevenZipFile(Stream stream)
     {
         try
@@ -186,6 +272,21 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         }
     }
 
+    public static async Task<bool> IsSevenZipFileAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        try
+        {
+            return await SignatureMatchAsync(stream, cancellationToken).ConfigureAwait(false);
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
     private static ReadOnlySpan<byte> Signature =>
         new byte[] { (byte)'7', (byte)'z', 0xBC, 0xAF, 0x27, 0x1C };
 
@@ -196,6 +297,16 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         return signatureBytes.SequenceEqual(Signature);
     }
 
+    private static async Task<bool> SignatureMatchAsync(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var signatureBytes = new byte[6];
+        await stream.ReadFullyAsync(signatureBytes, cancellationToken).ConfigureAwait(false);
+        return signatureBytes.SequenceEqual(Signature.ToArray());
+    }
+
     protected override IReader CreateReaderForSolidExtraction() =>
         new SevenZipReader(ReaderOptions, this);
 
@@ -205,8 +316,6 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
             .GroupBy(x => x.FilePart.Folder)
             .Any(folder => folder.Count() > 1);
 
-    public override bool IsEncrypted => Entries.First(x => !x.IsDirectory).IsEncrypted;
-
     public override long TotalSize =>
         _database?._packSizes.Aggregate(0L, (total, packSize) => total + packSize) ?? 0;
 

src/SharpCompress/Archives/Tar/TarArchive.cs

@@ -2,12 +2,14 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Tar;
 using SharpCompress.Common.Tar.Headers;
 using SharpCompress.IO;
+using SharpCompress.Polyfills;
 using SharpCompress.Readers;
 using SharpCompress.Readers.Tar;
 using SharpCompress.Writers;
@@ -28,6 +30,22 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
     }
 
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<TarArchive> OpenAsync(
+        string filePath,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return await OpenAsync(new FileInfo(filePath), readerOptions ?? new ReaderOptions(), cancellationToken);
+    }
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
@@ -45,6 +63,32 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<TarArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        var archive = new TarArchive();
+        archive.SourceStream = new SourceStream(
+            fileInfo,
+            i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<TarVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<TarArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Constructor with all file parts passed in
     /// </summary>
@@ -66,6 +110,33 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<TarArchive> OpenAsync(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        var archive = new TarArchive();
+        archive.SourceStream = new SourceStream(
+            files[0],
+            i => i < files.Length ? files[i] : null,
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<TarVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<TarArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Constructor with all stream parts passed in
     /// </summary>
@@ -84,6 +155,33 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         );
     }
 
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<TarArchive> OpenAsync(
+        IEnumerable<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        var archive = new TarArchive();
+        archive.SourceStream = new SourceStream(
+            strms[0],
+            i => i < strms.Length ? strms[i] : null,
+            readerOptions ?? new ReaderOptions()
+        );
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<TarVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<TarArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     /// <summary>
     /// Takes a seekable Stream as a source
     /// </summary>
@@ -103,6 +201,34 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         );
     }
 
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static async Task<TarArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        var archive = new TarArchive();
+        archive.SourceStream = new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions());
+        archive.LazyVolumes = new Lazy<IReadOnlyCollection<TarVolume>>(() => archive.LoadVolumes(archive.SourceStream).ToList());
+        archive.LazyEntries = new Lazy<IReadOnlyCollection<TarArchiveEntry>>(
+            () => archive.LoadEntriesAsync(archive.Volumes, cancellationToken).GetAwaiter().GetResult().ToList()
+        );
+        return archive;
+    }
+
     public static bool IsTarFile(string filePath) => IsTarFile(new FileInfo(filePath));
 
     public static bool IsTarFile(FileInfo fileInfo)
@@ -115,6 +241,24 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         return IsTarFile(stream);
     }
 
+    public static async Task<bool> IsTarFileAsync(
+        string filePath,
+        CancellationToken cancellationToken = default
+    ) => await IsTarFileAsync(new FileInfo(filePath), cancellationToken);
+
+    public static async Task<bool> IsTarFileAsync(
+        FileInfo fileInfo,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return await IsTarFileAsync(stream, cancellationToken);
+    }
+
     public static bool IsTarFile(Stream stream)
     {
         try
@@ -131,6 +275,26 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         return false;
     }
 
+    public static async Task<bool> IsTarFileAsync(
+        Stream stream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        try
+        {
+            var tarHeader = new TarHeader(new ArchiveEncoding());
+            var readSucceeded = await tarHeader.ReadAsync(stream, cancellationToken)
+                .ConfigureAwait(false);
+            var isEmptyArchive =
+                tarHeader.Name?.Length == 0
+                && tarHeader.Size == 0
+                && Enum.IsDefined(typeof(EntryType), tarHeader.EntryType);
+            return readSucceeded || isEmptyArchive;
+        }
+        catch { }
+        return false;
+    }
+
     protected override IEnumerable<TarVolume> LoadVolumes(SourceStream sourceStream)
     {
         sourceStream.NotNull("SourceStream is null").LoadAllParts(); //request all streams
@@ -145,7 +309,11 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         : base(ArchiveType.Tar, sourceStream) { }
 
     private TarArchive()
-        : base(ArchiveType.Tar) { }
+        : base(ArchiveType.Tar)
+    {
+        LazyVolumes = new Lazy<IReadOnlyCollection<TarVolume>>(() => LoadVolumes(SourceStream!).ToList());
+        LazyEntries = new Lazy<IReadOnlyCollection<TarArchiveEntry>>(() => LoadEntries(Volumes).ToList());
+    }
 
     protected override IEnumerable<TarArchiveEntry> LoadEntries(IEnumerable<TarVolume> volumes)
     {
@@ -205,6 +373,67 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         }
     }
 
+    private async Task<IReadOnlyCollection<TarArchiveEntry>> LoadEntriesAsync(IEnumerable<TarVolume> volumes, CancellationToken cancellationToken)
+    {
+        var list = new List<TarArchiveEntry>();
+        var stream = volumes.Single().Stream;
+        TarHeader? previousHeader = null;
+        await foreach (
+            var header in TarHeaderFactory.ReadHeaderAsync(
+                StreamingMode.Seekable,
+                stream,
+                ReaderOptions.ArchiveEncoding,
+                cancellationToken
+            ).WithCancellation(cancellationToken)
+        )
+        {
+            if (header != null)
+            {
+                if (header.EntryType == EntryType.LongName)
+                {
+                    previousHeader = header;
+                }
+                else
+                {
+                    if (previousHeader != null)
+                    {
+                        var entry = new TarArchiveEntry(
+                            this,
+                            new TarFilePart(previousHeader, stream),
+                            CompressionType.None
+                        );
+
+                        var oldStreamPos = stream.Position;
+
+                        using (var entryStream = entry.OpenEntryStream())
+                        {
+                            using var memoryStream = new MemoryStream();
+                            await entryStream.CopyToAsync(memoryStream, cancellationToken).ConfigureAwait(false);
+                            memoryStream.Position = 0;
+                            var bytes = memoryStream.ToArray();
+
+                            header.Name = ReaderOptions.ArchiveEncoding.Decode(bytes).TrimNulls();
+                        }
+
+                        stream.Position = oldStreamPos;
+
+                        previousHeader = null;
+                    }
+                    list.Add(new TarArchiveEntry(
+                        this,
+                        new TarFilePart(header, stream),
+                        CompressionType.None
+                    ));
+                }
+            }
+            else
+            {
+                throw new IncompleteArchiveException("Failed to read TAR header");
+            }
+        }
+        return list.AsReadOnly();
+    }
+
     public static TarArchive Create() => new();
 
     protected override TarArchiveEntry CreateEntryInternal(

src/SharpCompress/Archives/Zip/ZipArchive.cs

@@ -18,7 +18,7 @@ namespace SharpCompress.Archives.Zip;
 
 public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
 {
-    private readonly SeekableZipHeaderFactory? headerFactory;
+    protected internal SeekableZipHeaderFactory? headerFactory;
 
     /// <summary>
     /// Gets or sets the compression level applied to files added to the archive,
@@ -144,6 +144,14 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         return IsZipFile(stream, password, bufferSize);
     }
 
+
+
+// ... other using statements
+
+namespace SharpCompress.Archives.Zip;
+
+//... existing class
+
     public static bool IsZipFile(
         Stream stream,
         string? password = null,
@@ -177,6 +185,41 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         }
     }
 
+    public static async Task<bool> IsZipFileAsync(
+        Stream stream,
+        string? password = null,
+        CancellationToken cancellationToken = default,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    )
+    {
+        var headerFactory = new StreamingZipHeaderFactory(password, new ArchiveEncoding(), null);
+        try
+        {
+            if (stream is not SharpCompressStream)
+            {
+                stream = new SharpCompressStream(stream, bufferSize: bufferSize);
+            }
+
+            var header = await headerFactory
+                .ReadStreamHeaderAsync(stream, cancellationToken)
+                .FirstOrDefaultAsync(x => x.ZipHeaderType != ZipHeaderType.Split, cancellationToken)
+                .ConfigureAwait(false);
+            if (header is null)
+            {
+                return false;
+            }
+            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
+        }
+        catch (CryptographicException)
+        {
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
     public static bool IsZipMulti(
         Stream stream,
         string? password = null,
@@ -219,6 +262,50 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         }
     }
 
+    public static async Task<bool> IsZipMultiAsync(
+        Stream stream,
+        string? password = null,
+        CancellationToken cancellationToken = default,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    )
+    {
+        var headerFactory = new StreamingZipHeaderFactory(password, new ArchiveEncoding(), null);
+        try
+        {
+            if (stream is not SharpCompressStream)
+            {
+                stream = new SharpCompressStream(stream, bufferSize: bufferSize);
+            }
+
+            var header = await headerFactory
+                .ReadStreamHeaderAsync(stream, cancellationToken)
+                .FirstOrDefaultAsync(x => x.ZipHeaderType != ZipHeaderType.Split, cancellationToken)
+                .ConfigureAwait(false);
+            if (header is null)
+            {
+                if (stream.CanSeek) //could be multipart. Test for central directory - might not be z64 safe
+                {
+                    var z = new SeekableZipHeaderFactory(password, new ArchiveEncoding());
+                    var x = z.ReadSeekableHeader(stream).FirstOrDefault();
+                    return x?.ZipHeaderType == ZipHeaderType.DirectoryEntry;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
+        }
+        catch (CryptographicException)
+        {
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
     protected override IEnumerable<ZipVolume> LoadVolumes(SourceStream stream)
     {
         stream.LoadAllParts(); //request all streams

src/SharpCompress/Common/Rar/Headers/MarkHeader.cs

@@ -1,5 +1,7 @@
 using System;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Rar.Headers;
 
@@ -25,6 +27,20 @@ internal class MarkHeader : IRarHeader
         throw new EndOfStreamException();
     }
 
+    private static async Task<byte> GetByteAsync(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        byte[] buffer = new byte[1];
+        var read = await stream.ReadAsync(buffer, 0, 1, cancellationToken).ConfigureAwait(false);
+        if (read == 1)
+        {
+            return buffer[0];
+        }
+        throw new EndOfStreamException();
+    }
+
     public static MarkHeader Read(Stream stream, bool leaveStreamOpen, bool lookForHeader)
     {
         var maxScanIndex = lookForHeader ? MAX_SFX_SIZE : 0;
@@ -129,4 +145,115 @@ internal class MarkHeader : IRarHeader
 
         throw new InvalidFormatException("Rar signature not found");
     }
+
+    public static async Task<MarkHeader> ReadAsync(
+        Stream stream,
+        bool leaveStreamOpen,
+        bool lookForHeader,
+        CancellationToken cancellationToken
+    )
+    {
+        var maxScanIndex = lookForHeader ? MAX_SFX_SIZE : 0;
+        try
+        {
+            var start = -1;
+            var b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+            start++;
+            while (start <= maxScanIndex)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                // Rar old signature: 52 45 7E 5E
+                // Rar4 signature:    52 61 72 21 1A 07 00
+                // Rar5 signature:    52 61 72 21 1A 07 01 00
+                if (b == 0x52)
+                {
+                    b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                    start++;
+                    if (b == 0x61)
+                    {
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x72)
+                        {
+                            continue;
+                        }
+
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x21)
+                        {
+                            continue;
+                        }
+
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x1a)
+                        {
+                            continue;
+                        }
+
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x07)
+                        {
+                            continue;
+                        }
+
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b == 1)
+                        {
+                            b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                            start++;
+                            if (b != 0)
+                            {
+                                continue;
+                            }
+
+                            return new MarkHeader(true); // Rar5
+                        }
+                        else if (b == 0)
+                        {
+                            return new MarkHeader(false); // Rar4
+                        }
+                    }
+                    else if (b == 0x45)
+                    {
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x7e)
+                        {
+                            continue;
+                        }
+
+                        b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                        start++;
+                        if (b != 0x5e)
+                        {
+                            continue;
+                        }
+
+                        throw new InvalidFormatException(
+                            "Rar format version pre-4 is unsupported."
+                        );
+                    }
+                }
+                else
+                {
+                    b = await GetByteAsync(stream, cancellationToken).ConfigureAwait(false);
+                    start++;
+                }
+            }
+        }
+        catch (Exception e)
+        {
+            if (!leaveStreamOpen)
+            {
+                stream.Dispose();
+            }
+            throw new InvalidFormatException("Error trying to read rar signature.", e);
+        }
+
+        throw new InvalidFormatException("Rar signature not found");
+    }
 }

src/SharpCompress/Common/Tar/Headers/TarHeader.cs

@@ -2,6 +2,8 @@ using System;
 using System.Buffers.Binary;
 using System.IO;
 using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Tar.Headers;
 
@@ -187,6 +189,92 @@ internal sealed class TarHeader
         return true;
     }
 
+    internal async Task<bool> ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        string? longName = null;
+        string? longLinkName = null;
+        var hasLongValue = true;
+        byte[] buffer;
+        EntryType entryType;
+
+        do
+        {
+            buffer = await ReadBlockAsync(stream, cancellationToken).ConfigureAwait(false);
+
+            if (buffer.Length == 0)
+            {
+                return false;
+            }
+
+            entryType = ReadEntryType(buffer);
+
+            // LongName and LongLink headers can follow each other and need
+            // to apply to the header that follows them.
+            if (entryType == EntryType.LongName)
+            {
+                longName = await ReadLongNameAsync(stream, buffer, cancellationToken)
+                    .ConfigureAwait(false);
+                continue;
+            }
+            else if (entryType == EntryType.LongLink)
+            {
+                longLinkName = await ReadLongNameAsync(stream, buffer, cancellationToken)
+                    .ConfigureAwait(false);
+                continue;
+            }
+
+            hasLongValue = false;
+        } while (hasLongValue);
+
+        // Check header checksum
+        if (!checkChecksum(buffer))
+        {
+            return false;
+        }
+
+        Name = longName ?? ArchiveEncoding.Decode(buffer, 0, 100).TrimNulls();
+        EntryType = entryType;
+        Size = ReadSize(buffer);
+
+        // for symlinks, additionally read the linkname
+        if (entryType == EntryType.SymLink || entryType == EntryType.HardLink)
+        {
+            LinkName = longLinkName ?? ArchiveEncoding.Decode(buffer, 157, 100).TrimNulls();
+        }
+
+        Mode = ReadAsciiInt64Base8(buffer, 100, 7);
+
+        if (entryType == EntryType.Directory)
+        {
+            Mode |= 0b1_000_000_000;
+        }
+
+        UserId = ReadAsciiInt64Base8oldGnu(buffer, 108, 7);
+        GroupId = ReadAsciiInt64Base8oldGnu(buffer, 116, 7);
+
+        var unixTimeStamp = ReadAsciiInt64Base8(buffer, 136, 11);
+
+        LastModifiedTime = EPOCH.AddSeconds(unixTimeStamp).ToLocalTime();
+        Magic = ArchiveEncoding.Decode(buffer, 257, 6).TrimNulls();
+
+        if (!string.IsNullOrEmpty(Magic) && "ustar".Equals(Magic))
+        {
+            var namePrefix = ArchiveEncoding.Decode(buffer, 345, 157).TrimNulls();
+
+            if (!string.IsNullOrEmpty(namePrefix))
+            {
+                Name = namePrefix + "/" + Name;
+            }
+        }
+
+        if (entryType != EntryType.LongName && Name.Length == 0)
+        {
+            return false;
+        }
+
+        return true;
+    }
+
     private string ReadLongName(BinaryReader reader, byte[] buffer)
     {
         var size = ReadSize(buffer);
@@ -211,6 +299,39 @@ internal sealed class TarHeader
         return ArchiveEncoding.Decode(nameBytes, 0, nameBytes.Length).TrimNulls();
     }
 
+    private async Task<string> ReadLongNameAsync(
+        Stream stream,
+        byte[] buffer,
+        CancellationToken cancellationToken
+    )
+    {
+        var size = ReadSize(buffer);
+
+        // Validate size to prevent memory exhaustion from malformed headers
+        if (size < 0 || size > MAX_LONG_NAME_SIZE)
+        {
+            throw new InvalidFormatException(
+                $"Long name size {size} is invalid or exceeds maximum allowed size of {MAX_LONG_NAME_SIZE} bytes"
+            );
+        }
+
+        var nameLength = (int)size;
+        var nameBytes = new byte[nameLength];
+        await ReadFullyAsync(stream, nameBytes, 0, nameLength, cancellationToken)
+            .ConfigureAwait(false);
+
+        var remainingBytesToRead = BLOCK_SIZE - (nameLength % BLOCK_SIZE);
+
+        // Read the rest of the block and discard the data
+        if (remainingBytesToRead > 0 && remainingBytesToRead < BLOCK_SIZE)
+        {
+            var discardBuffer = new byte[remainingBytesToRead];
+            await ReadFullyAsync(stream, discardBuffer, 0, remainingBytesToRead, cancellationToken)
+                .ConfigureAwait(false);
+        }
+        return ArchiveEncoding.Decode(nameBytes, 0, nameBytes.Length).TrimNulls();
+    }
+
     private static EntryType ReadEntryType(byte[] buffer) => (EntryType)buffer[156];
 
     private long ReadSize(byte[] buffer)
@@ -234,6 +355,60 @@ internal sealed class TarHeader
         return buffer;
     }
 
+    private static async Task<byte[]> ReadBlockAsync(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = new byte[BLOCK_SIZE];
+        var bytesRead = 0;
+        while (bytesRead < BLOCK_SIZE)
+        {
+            var read = await stream.ReadAsync(
+                buffer,
+                bytesRead,
+                BLOCK_SIZE - bytesRead,
+                cancellationToken
+            );
+            if (read == 0)
+            {
+                // end of stream. If we read nothing, return empty array.
+                // if we read some, but not a full block, it's an error.
+                if (bytesRead == 0)
+                {
+                    return Array.Empty<byte>();
+                }
+                throw new InvalidFormatException("Buffer is invalid size");
+            }
+            bytesRead += read;
+        }
+
+        return buffer;
+    }
+
+    private static async Task ReadFullyAsync(
+        Stream stream,
+        byte[] buffer,
+        int offset,
+        int count,
+        CancellationToken cancellationToken
+    )
+    {
+        var totalRead = 0;
+        while (totalRead < count)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            var read = await stream
+                .ReadAsync(buffer, offset + totalRead, count - totalRead, cancellationToken)
+                .ConfigureAwait(false);
+            if (read == 0)
+            {
+                throw new EndOfStreamException("End of stream reached, but more bytes were expected.");
+            }
+            totalRead += read;
+        }
+    }
+
     private static void WriteStringBytes(ReadOnlySpan<byte> name, Span<byte> buffer, int length)
     {
         name.CopyTo(buffer);

src/SharpCompress/Common/Tar/TarHeaderFactory.cs

@@ -1,5 +1,8 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Tar.Headers;
 using SharpCompress.IO;
 
@@ -54,6 +57,54 @@ internal static class TarHeaderFactory
         }
     }
 
+    internal static async IAsyncEnumerable<TarHeader?> ReadHeaderAsync(
+        StreamingMode mode,
+        Stream stream,
+        ArchiveEncoding archiveEncoding,
+        [EnumeratorCancellation] CancellationToken cancellationToken
+    )
+    {
+        while (true)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            TarHeader? header = null;
+            try
+            {
+                header = new TarHeader(archiveEncoding);
+
+                if (!await header.ReadAsync(stream, cancellationToken).ConfigureAwait(false))
+                {
+                    yield break;
+                }
+                switch (mode)
+                {
+                    case StreamingMode.Seekable:
+                        {
+                            header.DataStartPosition = stream.Position;
+
+                            //skip to nearest 512
+                            stream.Position += PadTo512(header.Size);
+                        }
+                        break;
+                    case StreamingMode.Streaming:
+                        {
+                            header.PackedStream = new TarReadOnlySubStream(stream, header.Size);
+                        }
+                        break;
+                    default:
+                    {
+                        throw new InvalidFormatException("Invalid StreamingMode");
+                    }
+                }
+            }
+            catch
+            {
+                header = null;
+            }
+            yield return header;
+        }
+    }
+
     private static long PadTo512(long size)
     {
         var zeros = (int)(size % 512);

src/SharpCompress/Common/Zip/Headers/DirectoryEndHeader.cs

@@ -1,4 +1,7 @@
+using System.Buffers.Binary;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -19,6 +22,22 @@ internal class DirectoryEndHeader : ZipHeader
         Comment = reader.ReadBytes(CommentLength);
     }
 
+    internal async Task ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        VolumeNumber = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        FirstVolumeWithDirectory = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        TotalNumberOfEntriesInDisk = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        TotalNumberOfEntries = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        DirectorySize = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        DirectoryStartOffsetRelativeToDisk = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        CommentLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        Comment = await ZipHeaderFactory.ReadBytesAsync(stream, CommentLength, cancellationToken).ConfigureAwait(false);
+    }
+
     public ushort VolumeNumber { get; private set; }
 
     public ushort FirstVolumeWithDirectory { get; private set; }

src/SharpCompress/Common/Zip/Headers/DirectoryEntryHeader.cs

@@ -1,5 +1,8 @@
+using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -90,7 +93,114 @@ internal class DirectoryEntryHeader : ZipFileEntry
 
         if (unixTimeExtra is not null)
         {
-            // Tuple order is last modified time, last access time, and creation time.
+            var unixTimeTuple = ((UnixTimeExtraField)unixTimeExtra).UnicodeTimes;
+
+            if (unixTimeTuple.Item1.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item1.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+            else if (unixTimeTuple.Item2.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item2.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+            else if (unixTimeTuple.Item3.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item3.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+        }
+    }
+
+    internal async Task ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        Version = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        VersionNeededToExtract = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        Flags = (HeaderFlags)await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        CompressionMethod = (ZipCompressionMethod)
+            await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        OriginalLastModifiedTime =
+            LastModifiedTime = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        OriginalLastModifiedDate =
+            LastModifiedDate = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        Crc = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        CompressedSize = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        UncompressedSize = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        var nameLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        var extraLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        var commentLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        DiskNumberStart = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        InternalFileAttributes = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        ExternalFileAttributes = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        RelativeOffsetOfEntryHeader = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+
+        var name = await ZipHeaderFactory.ReadBytesAsync(stream, nameLength, cancellationToken).ConfigureAwait(false);
+        var extra = await ZipHeaderFactory.ReadBytesAsync(stream, extraLength, cancellationToken).ConfigureAwait(false);
+        var comment = await ZipHeaderFactory.ReadBytesAsync(stream, commentLength, cancellationToken)
+            .ConfigureAwait(false);
+
+        if (Flags.HasFlag(HeaderFlags.Efs))
+        {
+            Name = ArchiveEncoding.DecodeUTF8(name);
+            Comment = ArchiveEncoding.DecodeUTF8(comment);
+        }
+        else
+        {
+            Name = ArchiveEncoding.Decode(name);
+            Comment = ArchiveEncoding.Decode(comment);
+        }
+
+        LoadExtra(extra);
+
+        var unicodePathExtra = Extra.FirstOrDefault(u =>
+            u.Type == ExtraDataType.UnicodePathExtraField
+        );
+        if (unicodePathExtra != null && ArchiveEncoding.Forced == null)
+        {
+            Name = ((ExtraUnicodePathExtraField)unicodePathExtra).UnicodeName;
+        }
+
+        var zip64ExtraData = Extra.OfType<Zip64ExtendedInformationExtraField>().FirstOrDefault();
+        if (zip64ExtraData != null)
+        {
+            zip64ExtraData.Process(
+                UncompressedSize,
+                CompressedSize,
+                RelativeOffsetOfEntryHeader,
+                DiskNumberStart
+            );
+
+            if (CompressedSize == uint.MaxValue)
+            {
+                CompressedSize = zip64ExtraData.CompressedSize;
+            }
+
+            if (UncompressedSize == uint.MaxValue)
+            {
+                UncompressedSize = zip64ExtraData.UncompressedSize;
+            }
+
+            if (RelativeOffsetOfEntryHeader == uint.MaxValue)
+            {
+                RelativeOffsetOfEntryHeader = zip64ExtraData.RelativeOffsetOfEntryHeader;
+            }
+        }
+
+        var unixTimeExtra = Extra.FirstOrDefault(u => u.Type == ExtraDataType.UnixTimeExtraField);
+
+        if (unixTimeExtra is not null)
+        {
             var unixTimeTuple = ((UnixTimeExtraField)unixTimeExtra).UnicodeTimes;
 
             if (unixTimeTuple.Item1.HasValue)

src/SharpCompress/Common/Zip/Headers/LocalEntryHeader.cs

@@ -1,5 +1,8 @@
+using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -96,5 +99,87 @@ internal class LocalEntryHeader : ZipFileEntry
         }
     }
 
+    internal async Task ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        Version = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        Flags = (HeaderFlags)await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        CompressionMethod = (ZipCompressionMethod)
+            await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        OriginalLastModifiedTime =
+            LastModifiedTime = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        OriginalLastModifiedDate =
+            LastModifiedDate = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        Crc = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        CompressedSize = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        UncompressedSize = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        var nameLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        var extraLength = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        var name = await ZipHeaderFactory.ReadBytesAsync(stream, nameLength, cancellationToken).ConfigureAwait(false);
+        var extra = await ZipHeaderFactory.ReadBytesAsync(stream, extraLength, cancellationToken).ConfigureAwait(false);
+
+        if (Flags.HasFlag(HeaderFlags.Efs))
+        {
+            Name = ArchiveEncoding.DecodeUTF8(name);
+        }
+        else
+        {
+            Name = ArchiveEncoding.Decode(name);
+        }
+
+        LoadExtra(extra);
+
+        var unicodePathExtra = Extra.FirstOrDefault(u =>
+            u.Type == ExtraDataType.UnicodePathExtraField
+        );
+        if (unicodePathExtra != null && ArchiveEncoding.Forced == null)
+        {
+            Name = ((ExtraUnicodePathExtraField)unicodePathExtra).UnicodeName;
+        }
+
+        var zip64ExtraData = Extra.OfType<Zip64ExtendedInformationExtraField>().FirstOrDefault();
+        if (zip64ExtraData != null)
+        {
+            zip64ExtraData.Process(UncompressedSize, CompressedSize, 0, 0);
+
+            if (CompressedSize == uint.MaxValue)
+            {
+                CompressedSize = zip64ExtraData.CompressedSize;
+            }
+            if (UncompressedSize == uint.MaxValue)
+            {
+                UncompressedSize = zip64ExtraData.UncompressedSize;
+            }
+        }
+
+        var unixTimeExtra = Extra.FirstOrDefault(u => u.Type == ExtraDataType.UnixTimeExtraField);
+
+        if (unixTimeExtra is not null)
+        {
+            var unixTimeTuple = ((UnixTimeExtraField)unixTimeExtra).UnicodeTimes;
+
+            if (unixTimeTuple.Item1.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item1.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+            else if (unixTimeTuple.Item2.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item2.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+            else if (unixTimeTuple.Item3.HasValue)
+            {
+                var dosTime = Utility.DateTimeToDosTime(unixTimeTuple.Item3.Value);
+
+                LastModifiedDate = (ushort)(dosTime >> 16);
+                LastModifiedTime = (ushort)(dosTime & 0x0FFFF);
+            }
+        }
+    }
+
     internal ushort Version { get; private set; }
 }

src/SharpCompress/Common/Zip/Headers/Zip64DirectoryEndHeader.cs

@@ -1,4 +1,7 @@
+using System.Buffers.Binary;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -26,6 +29,35 @@ internal class Zip64DirectoryEndHeader : ZipHeader
         );
     }
 
+    internal async Task ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        SizeOfDirectoryEndRecord = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        VersionMadeBy = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken).ConfigureAwait(false);
+        VersionNeededToExtract = await ZipHeaderFactory.ReadUInt16Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        VolumeNumber = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+        FirstVolumeWithDirectory = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        TotalNumberOfEntriesInDisk = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        TotalNumberOfEntries = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        DirectorySize = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        DirectoryStartOffsetRelativeToDisk = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        DataSector = await ZipHeaderFactory.ReadBytesAsync(
+                stream,
+                (int)(
+                    SizeOfDirectoryEndRecord
+                    - SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS
+                ),
+                cancellationToken
+            )
+            .ConfigureAwait(false);
+    }
+
     private const int SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS = 44;
 
     public long SizeOfDirectoryEndRecord { get; private set; }

src/SharpCompress/Common/Zip/Headers/Zip64DirectoryEndLocatorHeader.cs

@@ -1,4 +1,7 @@
+using System.Buffers.Binary;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -14,6 +17,16 @@ internal class Zip64DirectoryEndLocatorHeader : ZipHeader
         TotalNumberOfVolumes = reader.ReadUInt32();
     }
 
+    internal async Task ReadAsync(Stream stream, CancellationToken cancellationToken)
+    {
+        FirstVolumeWithDirectory = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+        RelativeOffsetOfTheEndOfDirectoryRecord = (long)
+            await ZipHeaderFactory.ReadUInt64Async(stream, cancellationToken).ConfigureAwait(false);
+        TotalNumberOfVolumes = await ZipHeaderFactory.ReadUInt32Async(stream, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
     public uint FirstVolumeWithDirectory { get; private set; }
 
     public long RelativeOffsetOfTheEndOfDirectoryRecord { get; private set; }

src/SharpCompress/Common/Zip/SeekableZipHeaderFactory.cs

@@ -1,6 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -85,6 +88,90 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         }
     }
 
+    internal async IAsyncEnumerable<ZipHeader> ReadSeekableHeaderAsync(
+        Stream stream,
+        [EnumeratorCancellation] CancellationToken cancellationToken
+    )
+    {
+        // Still need BinaryReader for synchronous SeekBackToHeader, until SeekBackToHeaderAsync is implemented
+        var reader = new BinaryReader(stream);
+
+        SeekBackToHeader(stream, reader); // Synchronous due to stream.Seek and BinaryReader
+
+        var eocd_location = stream.Position;
+        var entry = new DirectoryEndHeader();
+        await entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+
+        if (entry.IsZip64)
+        {
+            _zip64 = true;
+
+            stream.Seek(eocd_location - ZIP64_EOCD_LENGTH - 4, SeekOrigin.Begin); // Synchronous seek
+            var zip64_locator = await ReadUInt32Async(stream, cancellationToken)
+                .ConfigureAwait(false);
+            if (zip64_locator != ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR)
+            {
+                throw new ArchiveException("Failed to locate the Zip64 Directory Locator");
+            }
+
+            var zip64Locator = new Zip64DirectoryEndLocatorHeader();
+            await zip64Locator.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+
+            stream.Seek(
+                zip64Locator.RelativeOffsetOfTheEndOfDirectoryRecord,
+                SeekOrigin.Begin
+            ); // Synchronous seek
+            var zip64Signature = await ReadUInt32Async(stream, cancellationToken)
+                .ConfigureAwait(false);
+            if (zip64Signature != ZIP64_END_OF_CENTRAL_DIRECTORY)
+            {
+                throw new ArchiveException("Failed to locate the Zip64 Header");
+            }
+
+            var zip64Entry = new Zip64DirectoryEndHeader();
+            await zip64Entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+            stream.Seek(
+                zip64Entry.DirectoryStartOffsetRelativeToDisk,
+                SeekOrigin.Begin
+            ); // Synchronous seek
+        }
+        else
+        {
+            stream.Seek(entry.DirectoryStartOffsetRelativeToDisk, SeekOrigin.Begin); // Synchronous seek
+        }
+
+        var position = stream.Position;
+        while (true)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            stream.Position = position; // Synchronous seek
+            var signature = await ReadUInt32Async(stream, cancellationToken)
+                .ConfigureAwait(false);
+            var nextHeader = await ReadHeaderAsync(
+                signature,
+                stream,
+                _zip64,
+                cancellationToken
+            ).ConfigureAwait(false);
+            position = stream.Position;
+
+            if (nextHeader is null)
+            {
+                yield break;
+            }
+
+            if (nextHeader is DirectoryEntryHeader entryHeader)
+            {
+                entryHeader.HasData = entryHeader.CompressedSize != 0;
+                yield return entryHeader;
+            }
+            else if (nextHeader is DirectoryEndHeader endHeader)
+            {
+                yield return endHeader;
+            }
+        }
+    }
+
     private static bool IsMatch(byte[] haystack, int position, byte[] needle)
     {
         for (var i = 0; i < needle.Length; i++)

src/SharpCompress/Common/Zip/StreamingZipHeaderFactory.cs

@@ -1,7 +1,10 @@
 using System;
+using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -200,4 +203,230 @@ internal class StreamingZipHeaderFactory : ZipHeaderFactory
             yield return header;
         }
     }
+
+    internal async IAsyncEnumerable<ZipHeader> ReadStreamHeaderAsync(
+        Stream stream,
+        [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken
+    )
+    {
+        if (stream is not SharpCompressStream)
+        {
+            if (stream is SourceStream src)
+            {
+                stream = new SharpCompressStream(
+                    stream,
+                    src.ReaderOptions.LeaveStreamOpen,
+                    bufferSize: src.ReaderOptions.BufferSize
+                );
+            }
+            else
+            {
+                throw new ArgumentException("Stream must be a SharpCompressStream", nameof(stream));
+            }
+        }
+        var rewindableStream = (SharpCompressStream)stream;
+
+        while (true)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            uint headerBytes = 0;
+            if (
+                _lastEntryHeader != null
+                && FlagUtility.HasFlag(_lastEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor)
+            )
+            {
+                if (_lastEntryHeader.Part is null)
+                {
+                    continue;
+                }
+
+                var pos = rewindableStream.CanSeek ? (long?)rewindableStream.Position : null;
+
+                var crc = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+                if (crc == POST_DATA_DESCRIPTOR)
+                {
+                    crc = await ReadUInt32Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                _lastEntryHeader.Crc = crc;
+
+                ulong compSize = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+                ulong uncompSize = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+                headerBytes = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+
+                bool isSentinel = compSize == 0xFFFFFFFF || uncompSize == 0xFFFFFFFF;
+                bool isHeader = headerBytes == 0x04034b50 || headerBytes == 0x02014b50;
+
+                if (!isHeader && !isSentinel)
+                {
+                    compSize = (uncompSize << 32) | compSize;
+                    uncompSize =
+                        ((ulong)headerBytes << 32)
+                        | await ReadUInt32Async(rewindableStream, cancellationToken)
+                            .ConfigureAwait(false);
+                    headerBytes = await ReadUInt32Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                else if (isSentinel)
+                {
+                    compSize = await ReadUInt64Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                    uncompSize = await ReadUInt64Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+
+                _lastEntryHeader.CompressedSize = (long)compSize;
+                _lastEntryHeader.UncompressedSize = (long)uncompSize;
+
+                if (pos.HasValue)
+                {
+                    _lastEntryHeader.DataStartPosition = pos - _lastEntryHeader.CompressedSize;
+                }
+            }
+            else if (_lastEntryHeader != null && _lastEntryHeader.IsZip64)
+            {
+                if (_lastEntryHeader.Part is null)
+                    continue;
+
+                var pos = rewindableStream.CanSeek ? (long?)rewindableStream.Position : null;
+
+                headerBytes = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+
+                await ReadBytesAsync(rewindableStream, 12, cancellationToken).ConfigureAwait(false); //skip a bunch of fields we don't care about
+
+                var crc = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+
+                if (crc == POST_DATA_DESCRIPTOR)
+                {
+                    crc = await ReadUInt32Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                _lastEntryHeader.Crc = crc;
+
+                var compressed_size = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+                var uncompressed_size = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+
+                var test_header = !(headerBytes == 0x04034b50 || headerBytes == 0x02014b50);
+
+                var test_64bit = ((long)uncompressed_size << 32) | compressed_size;
+                if (test_64bit == _lastEntryHeader.CompressedSize && test_header)
+                {
+                    _lastEntryHeader.UncompressedSize =
+                        ((long)await ReadUInt32Async(rewindableStream, cancellationToken)
+                            .ConfigureAwait(false) << 32) | headerBytes;
+                    headerBytes = await ReadUInt32Async(rewindableStream, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                else
+                {
+                    _lastEntryHeader.UncompressedSize = uncompressed_size;
+                }
+
+                if (pos.HasValue)
+                {
+                    _lastEntryHeader.DataStartPosition = pos - _lastEntryHeader.CompressedSize;
+
+                    rewindableStream.Position = pos.Value + 4;
+                }
+            }
+            else
+            {
+                headerBytes = await ReadUInt32Async(rewindableStream, cancellationToken)
+                    .ConfigureAwait(false);
+            }
+
+            _lastEntryHeader = null;
+            var header = await ReadHeaderAsync(
+                headerBytes,
+                rewindableStream,
+                cancellationToken: cancellationToken
+            );
+            if (header is null)
+            {
+                yield break;
+            }
+
+            if (header.ZipHeaderType == ZipHeaderType.LocalEntry)
+            {
+                var local_header = ((LocalEntryHeader)header);
+                var dir_header = _entries?.FirstOrDefault(entry =>
+                    entry.Key == local_header.Name
+                    && local_header.CompressedSize == 0
+                    && local_header.UncompressedSize == 0
+                    && local_header.Crc == 0
+                    && local_header.IsDirectory == false
+                );
+
+                if (dir_header != null)
+                {
+                    local_header.UncompressedSize = dir_header.Size;
+                    local_header.CompressedSize = dir_header.CompressedSize;
+                    local_header.Crc = (uint)dir_header.Crc;
+                }
+
+                if (local_header.CompressedSize > 0)
+                {
+                    header.HasData = true;
+                }
+                else if (local_header.Flags.HasFlag(HeaderFlags.UsePostDataDescriptor))
+                {
+                    var nextHeaderBytes = await ReadUInt32Async(
+                        rewindableStream,
+                        cancellationToken
+                    );
+                    ((IStreamStack)rewindableStream).Rewind(sizeof(uint));
+
+                    header.HasData = !IsHeader(nextHeaderBytes);
+                }
+                else
+                {
+                    header.HasData = false;
+                }
+            }
+            yield return header;
+        }
+    }
+
+    private static async Task<byte[]> ReadBytesAsync(
+        Stream stream,
+        int count,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = new byte[count];
+        var read = await stream.ReadAsync(buffer, 0, count, cancellationToken);
+        if (read < count)
+        {
+            throw new EndOfStreamException();
+        }
+        return buffer;
+    }
+
+    private static async Task<uint> ReadUInt32Async(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = await ReadBytesAsync(stream, 4, cancellationToken);
+        return BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+    }
+
+    private static async Task<ushort> ReadUInt16Async(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = await ReadBytesAsync(stream, 2, cancellationToken);
+        return BinaryPrimitives.ReadUInt16LittleEndian(buffer);
+    }
+
 }

src/SharpCompress/Common/Zip/ZipHeaderFactory.cs

@@ -1,6 +1,9 @@
 using System;
+using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -106,6 +109,129 @@ internal class ZipHeaderFactory
         }
     }
 
+    protected async Task<ZipHeader?> ReadHeaderAsync(
+        uint headerBytes,
+        Stream stream,
+        bool zip64 = false,
+        CancellationToken cancellationToken = default
+    )
+    {
+        switch (headerBytes)
+        {
+            case ENTRY_HEADER_BYTES:
+            {
+                var entryHeader = new LocalEntryHeader(_archiveEncoding);
+                await entryHeader.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                await LoadHeaderAsync(entryHeader, stream, cancellationToken).ConfigureAwait(false);
+
+                _lastEntryHeader = entryHeader;
+                return entryHeader;
+            }
+            case DIRECTORY_START_HEADER_BYTES:
+            {
+                var entry = new DirectoryEntryHeader(_archiveEncoding);
+                await entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                return entry;
+            }
+            case POST_DATA_DESCRIPTOR:
+            {
+                if (
+                    _lastEntryHeader != null
+                    && FlagUtility.HasFlag(
+                        _lastEntryHeader.NotNull().Flags,
+                        HeaderFlags.UsePostDataDescriptor
+                    )
+                )
+                {
+                    _lastEntryHeader.Crc = await ReadUInt32Async(stream, cancellationToken)
+                        .ConfigureAwait(false);
+                    _lastEntryHeader.CompressedSize = zip64
+                        ? (long)await ReadUInt64Async(stream, cancellationToken)
+                            .ConfigureAwait(false)
+                        : await ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+                    _lastEntryHeader.UncompressedSize = zip64
+                        ? (long)await ReadUInt64Async(stream, cancellationToken)
+                            .ConfigureAwait(false)
+                        : await ReadUInt32Async(stream, cancellationToken).ConfigureAwait(false);
+                }
+                else
+                {
+                    await ReadBytesAsync(stream, zip64 ? 20 : 12, cancellationToken)
+                        .ConfigureAwait(false);
+                }
+                return null;
+            }
+            case DIGITAL_SIGNATURE:
+                return null;
+            case DIRECTORY_END_HEADER_BYTES:
+            {
+                var entry = new DirectoryEndHeader();
+                await entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                return entry;
+            }
+            case SPLIT_ARCHIVE_HEADER_BYTES:
+            {
+                return new SplitHeader();
+            }
+            case ZIP64_END_OF_CENTRAL_DIRECTORY:
+            {
+                var entry = new Zip64DirectoryEndHeader();
+                await entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                return entry;
+            }
+            case ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR:
+            {
+                var entry = new Zip64DirectoryEndLocatorHeader();
+                await entry.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                return entry;
+            }
+            default:
+                return null;
+        }
+    }
+
+    internal static async Task<byte[]> ReadBytesAsync(
+        Stream stream,
+        int count,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = new byte[count];
+        var read = await stream.ReadAsync(buffer, 0, count, cancellationToken);
+        if (read < count)
+        {
+            throw new EndOfStreamException();
+        }
+        return buffer;
+    }
+
+    internal static async Task<uint> ReadUInt32Async(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = await ReadBytesAsync(stream, 4, cancellationToken);
+        return BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+    }
+
+    internal static async Task<ushort> ReadUInt16Async(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = await ReadBytesAsync(stream, 2, cancellationToken);
+        return BinaryPrimitives.ReadUInt16LittleEndian(buffer);
+    }
+
+    internal static async Task<ulong> ReadUInt64Async(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        var buffer = await ReadBytesAsync(stream, 8, cancellationToken);
+        return BinaryPrimitives.ReadUInt64LittleEndian(buffer);
+    }
+
     internal static bool IsHeader(uint headerBytes)
     {
         switch (headerBytes)
@@ -176,12 +302,6 @@ internal class ZipHeaderFactory
             return;
         }
 
-        //if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
-        //{
-        //    entryHeader.PackedStream = new ReadOnlySubStream(stream);
-        //}
-        //else
-        //{
         switch (_mode)
         {
             case StreamingMode.Seekable:
@@ -202,7 +322,87 @@ internal class ZipHeaderFactory
                 throw new InvalidFormatException("Invalid StreamingMode");
             }
         }
+    }
 
-        //}
+    private async Task LoadHeaderAsync(
+        ZipFileEntry entryHeader,
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+    {
+        if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.Encrypted))
+        {
+            if (
+                !entryHeader.IsDirectory
+                && entryHeader.CompressedSize == 0
+                && FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor)
+            )
+            {
+                throw new NotSupportedException(
+                    "SharpCompress cannot currently read non-seekable Zip Streams with encrypted data that has been written in a non-seekable manner."
+                );
+            }
+
+            if (_password is null)
+            {
+                throw new CryptographicException("No password supplied for encrypted zip.");
+            }
+
+            entryHeader.Password = _password;
+
+            if (entryHeader.CompressionMethod == ZipCompressionMethod.WinzipAes)
+            {
+                var data = entryHeader.Extra.SingleOrDefault(x =>
+                    x.Type == ExtraDataType.WinZipAes
+                );
+                if (data != null)
+                {
+                    var keySize = (WinzipAesKeySize)data.DataBytes[4];
+
+                    var salt = new byte[WinzipAesEncryptionData.KeyLengthInBytes(keySize) / 2];
+                    var passwordVerifyValue = new byte[2];
+                    await stream
+                        .ReadAsync(salt, 0, salt.Length, cancellationToken)
+                        .ConfigureAwait(false);
+                    await stream
+                        .ReadAsync(passwordVerifyValue, 0, 2, cancellationToken)
+                        .ConfigureAwait(false);
+                    entryHeader.WinzipAesEncryptionData = new WinzipAesEncryptionData(
+                        keySize,
+                        salt,
+                        passwordVerifyValue,
+                        _password
+                    );
+
+                    entryHeader.CompressedSize -= (uint)(salt.Length + 2);
+                }
+            }
+        }
+
+        if (entryHeader.IsDirectory)
+        {
+            return;
+        }
+
+        switch (_mode)
+        {
+            case StreamingMode.Seekable:
+            {
+                entryHeader.DataStartPosition = stream.Position;
+                stream.Position += entryHeader.CompressedSize;
+                break;
+            }
+
+            case StreamingMode.Streaming:
+            {
+                entryHeader.PackedStream = stream;
+                break;
+            }
+
+            default:
+            {
+                throw new InvalidFormatException("Invalid StreamingMode");
+            }
+        }
     }
 }

src/SharpCompress/Factories/GZipFactory.cs

@@ -1,6 +1,9 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.IO.Compression;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.GZip;
 using SharpCompress.Archives.Tar;
@@ -46,6 +49,12 @@ public class GZipFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => GZipArchive.IsGZipFile(stream);
 
+    public override Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    ) => GZipArchive.IsGZipFileAsync(stream, cancellationToken);
+
     #endregion
 
     #region IArchiveFactory
@@ -54,10 +63,24 @@ public class GZipFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await GZipArchive.OpenAsync(stream, readerOptions, cancellationToken).ConfigureAwait(false);
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await GZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken).ConfigureAwait(false);
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -66,10 +89,24 @@ public class GZipFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await GZipArchive.OpenAsync(streams, readerOptions, cancellationToken).ConfigureAwait(false);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await GZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken).ConfigureAwait(false);
+
     #endregion
 
     #region IReaderFactory

src/SharpCompress/Factories/IFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Factories;
@@ -42,6 +44,18 @@ public interface IFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     );
 
+    /// <summary>
+    /// Returns true if the stream represents an archive of the format defined by this type.
+    /// </summary>
+    /// <param name="stream">A stream, pointing to the beginning of the archive.</param>
+    /// <param name="cancellationToken">the cancellation token</param>
+    /// <param name="password">optional password</param>
+    Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    );
+
     /// <summary>
     /// From a passed in archive (zip, rar, 7z, 001), return all parts.
     /// </summary>

src/SharpCompress/Factories/RarFactory.cs

@@ -1,5 +1,8 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Rar;
 using SharpCompress.Common;
@@ -35,6 +38,12 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => RarArchive.IsRarFile(stream);
 
+    public override Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    ) => RarArchive.IsRarFileAsync(stream, cancellationToken);
+
     /// <inheritdoc/>
     public override FileInfo? GetFilePart(int index, FileInfo part1) =>
         RarArchiveVolumeFactory.GetFilePart(index, part1);
@@ -47,10 +56,24 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -59,10 +82,24 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region IReaderFactory

src/SharpCompress/Factories/SevenZipFactory.cs

@@ -1,5 +1,8 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.SevenZip;
 using SharpCompress.Common;
@@ -34,6 +37,12 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => SevenZipArchive.IsSevenZipFile(stream);
 
+    public override Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    ) => SevenZipArchive.IsSevenZipFileAsync(stream, cancellationToken);
+
     #endregion
 
     #region IArchiveFactory
@@ -42,10 +51,24 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -54,10 +77,24 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region reader

src/SharpCompress/Factories/TarFactory.cs

@@ -2,6 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
@@ -57,238 +59,39 @@ public class TarFactory
         Stream stream,
         string? password = null,
         int bufferSize = ReaderOptions.DefaultBufferSize
-    )
-    {
-        if (!stream.CanSeek)
-        {
-            return TarArchive.IsTarFile(stream); // For non-seekable streams, just check if it's a tar file
-        }
+    ) => TarArchive.IsTarFile(stream);
 
-        var startPosition = stream.Position;
-
-        // First check if it's a regular tar file
-        if (TarArchive.IsTarFile(stream))
-        {
-            stream.Seek(startPosition, SeekOrigin.Begin); // Seek back for consistency
-            return true;
-        }
-
-        // Seek back after the tar file check
-        stream.Seek(startPosition, SeekOrigin.Begin);
-
-        if (compressionOptions == null)
-        {
-            return false;
-        }
-
-        try
-        {
-            // Try each compression option to see if it contains a tar file
-            foreach (var testOption in compressionOptions)
-            {
-                if (testOption.Type == CompressionType.None)
-                {
-                    continue; // Skip uncompressed
-                }
-
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                try
-                {
-                    if (testOption.CanHandle(stream))
-                    {
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-
-                        // Try to decompress and check if it contains a tar archive
-                        // For compression formats that don't support leaveOpen, we need to save/restore position
-                        var positionBeforeDecompress = stream.Position;
-                        Stream? decompressedStream = null;
-                        bool streamWasClosed = false;
-                        
-                        try
-                        {
-                            decompressedStream = testOption.Type switch
-                            {
-                                CompressionType.BZip2 => new BZip2Stream(stream, CompressionMode.Decompress, true),
-                                _ => testOption.CreateStream(stream) // For other types, may close the stream
-                            };
-
-                            if (TarArchive.IsTarFile(decompressedStream))
-                            {
-                                return true;
-                            }
-                        }
-                        catch (ObjectDisposedException)
-                        {
-                            streamWasClosed = true;
-                            throw; // Stream was closed, can't continue
-                        }
-                        finally
-                        {
-                            decompressedStream?.Dispose();
-                            
-                            if (!streamWasClosed && stream.CanSeek)
-                            {
-                                try
-                                {
-                                    stream.Seek(positionBeforeDecompress, SeekOrigin.Begin);
-                                }
-                                catch
-                                {
-                                    // If seek fails, the stream might have been closed
-                                }
-                            }
-                        }
-
-                        // Seek back to start after decompression attempt
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-                    }
-                }
-                catch
-                {
-                    // If decompression fails, it's not this format - continue to next option
-                    try
-                    {
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-                    }
-                    catch
-                    {
-                        // Ignore seek failures
-                    }
-                }
-            }
-
-            return false;
-        }
-        finally
-        {
-            try
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-            }
-            catch
-            {
-                // Ignore seek failures
-            }
-        }
-    }
+    public override Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    ) => TarArchive.IsTarFileAsync(stream, cancellationToken);
 
     #endregion
 
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        readerOptions ??= new ReaderOptions();
-
-        // Try to detect and handle compressed tar formats
-        if (stream.CanSeek)
-        {
-            var startPosition = stream.Position;
-
-            // Try each compression option to see if we can decompress it
-            foreach (var testOption in compressionOptions)
-            {
-                if (testOption.Type == CompressionType.None)
-                {
-                    continue; // Skip uncompressed
-                }
-
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                if (testOption.CanHandle(stream))
-                {
-                    stream.Seek(startPosition, SeekOrigin.Begin);
-
-                    // Decompress the entire stream into a seekable MemoryStream
-                    using var decompressedStream = testOption.CreateStream(stream);
-                    var memoryStream = new MemoryStream();
-                    decompressedStream.CopyTo(memoryStream);
-                    memoryStream.Position = 0;
-
-                    // Verify it's actually a tar file
-                    if (TarArchive.IsTarFile(memoryStream))
-                    {
-                        memoryStream.Position = 0;
-                        // Return a TarArchive from the decompressed memory stream
-                        // The TarArchive will own the MemoryStream and dispose it when disposed
-                        var options = new ReaderOptions
-                        {
-                            LeaveStreamOpen = false, // Ensure the MemoryStream is disposed with the archive
-                            ArchiveEncoding = readerOptions?.ArchiveEncoding ?? new ArchiveEncoding()
-                        };
-                        return TarArchive.Open(memoryStream, options);
-                    }
-
-                    memoryStream.Dispose();
-                }
-            }
-
-            stream.Seek(startPosition, SeekOrigin.Begin);
-        }
-
-        // Fall back to normal tar archive opening
-        return TarArchive.Open(stream, readerOptions);
-    }
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
-    {
-        readerOptions ??= new ReaderOptions();
+    public async Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await TarArchive.OpenAsync(stream, readerOptions, cancellationToken).ConfigureAwait(false);
 
-        // Try to detect and handle compressed tar formats by file extension and content
-        using var fileStream = fileInfo.OpenRead();
+    /// <inheritdoc/>
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(fileInfo, readerOptions);
 
-        // Try each compression option
-        foreach (var testOption in compressionOptions)
-        {
-            if (testOption.Type == CompressionType.None)
-            {
-                continue; // Skip uncompressed
-            }
-
-            // Check if file extension matches
-            var fileName = fileInfo.Name.ToLowerInvariant();
-            if (testOption.KnownExtensions.Any(ext => fileName.EndsWith(ext)))
-            {
-                fileStream.Position = 0;
-
-                // Verify it's the right compression format
-                if (testOption.CanHandle(fileStream))
-                {
-                    fileStream.Position = 0;
-
-                    // Decompress the entire file into a seekable MemoryStream
-                    using var decompressedStream = testOption.CreateStream(fileStream);
-                    var memoryStream = new MemoryStream();
-                    decompressedStream.CopyTo(memoryStream);
-                    memoryStream.Position = 0;
-
-                    // Verify it's actually a tar file
-                    if (TarArchive.IsTarFile(memoryStream))
-                    {
-                        memoryStream.Position = 0;
-                        // Return a TarArchive from the decompressed memory stream
-                        // The TarArchive will own the MemoryStream and dispose it when disposed
-                        var options = new ReaderOptions
-                        {
-                            LeaveStreamOpen = false, // Ensure the MemoryStream is disposed with the archive
-                            ArchiveEncoding = readerOptions?.ArchiveEncoding ?? new ArchiveEncoding()
-                        };
-                        return TarArchive.Open(memoryStream, options);
-                    }
-
-                    memoryStream.Dispose();
-                }
-            }
-        }
-
-        // fileStream will be closed by the using statement
-
-        // Fall back to normal tar archive opening
-        return TarArchive.Open(fileInfo, readerOptions);
-    }
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await TarArchive.OpenAsync(fileInfo, readerOptions, cancellationToken).ConfigureAwait(false);
 
     #endregion
 
@@ -298,10 +101,24 @@ public class TarFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await TarArchive.OpenAsync(streams, readerOptions, cancellationToken).ConfigureAwait(false);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public async Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await TarArchive.OpenAsync(fileInfos, readerOptions, cancellationToken).ConfigureAwait(false);
+
     #endregion
 
     #region IReaderFactory
@@ -463,6 +280,7 @@ public class TarFactory
 
     #endregion
 
+
     #region IWriteableArchiveFactory
 
     /// <inheritdoc/>

src/SharpCompress/Factories/ZipFactory.cs

@@ -1,5 +1,8 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Zip;
 using SharpCompress.Common;
@@ -79,6 +82,44 @@ public class ZipFactory
         return false;
     }
 
+    public override async Task<bool> IsArchiveAsync(
+        Stream stream,
+        CancellationToken cancellationToken,
+        string? password = null
+    )
+    {
+        var startPosition = stream.CanSeek ? stream.Position : -1;
+
+        if (stream is not SharpCompressStream)
+        {
+            stream = new SharpCompressStream(
+                stream,
+                bufferSize: ReaderOptions.DefaultBufferSize
+            );
+        }
+
+        if (await ZipArchive.IsZipFileAsync(stream, password, cancellationToken).ConfigureAwait(false))
+        {
+            return true;
+        }
+
+        if (!stream.CanSeek)
+        {
+            return false;
+        }
+
+        stream.Position = startPosition;
+
+        if (await ZipArchive.IsZipMultiAsync(stream, password, cancellationToken).ConfigureAwait(false))
+        {
+            return true;
+        }
+
+        stream.Position = startPosition;
+
+        return false;
+    }
+
     /// <inheritdoc/>
     public override FileInfo? GetFilePart(int index, FileInfo part1) =>
         ZipArchiveVolumeFactory.GetFilePart(index, part1);
@@ -91,10 +132,22 @@ public class ZipFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(stream, readerOptions);
 
+    public Task<IArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(fileInfo, readerOptions);
 
+    public Task<IArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -103,10 +156,22 @@ public class ZipFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(streams, readerOptions);
 
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(fileInfos, readerOptions);
 
+    public Task<IArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => throw new NotImplementedException();
+
     #endregion
 
     #region IReaderFactory

src/SharpCompress/Polyfills/AsyncEnumerableExtensions.cs

@@ -0,0 +1,38 @@
+#if !NETFRAMEWORK && !NETSTANDARD2_0
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SharpCompress.Polyfills;
+
+internal static class AsyncEnumerableExtensions
+{
+    public static async Task<T?> FirstOrDefaultAsync<T>(
+        this IAsyncEnumerable<T> source,
+        CancellationToken cancellationToken = default
+    )
+    {
+        await foreach (var item in source.WithCancellation(cancellationToken))
+        {
+            return item;
+        }
+        return default;
+    }
+    public static async Task<T?> FirstOrDefaultAsync<T>(
+        this IAsyncEnumerable<T> source,
+        Func<T, bool> predicate,
+        CancellationToken cancellationToken = default
+    )
+    {
+        await foreach (var item in source.WithCancellation(cancellationToken))
+        {
+            if (predicate(item))
+            {
+                return item;
+            }
+        }
+        return default;
+    }
+}
+#endif

tests/SharpCompress.Test/ArchiveFactoryCompressedTarTests.cs

@@ -1,63 +0,0 @@
-using System;
-using System.IO;
-using SharpCompress.Archives;
-using Xunit;
-
-namespace SharpCompress.Test;
-
-public class ArchiveFactoryCompressedTarTests : TestBase
-{
-    [Fact]
-    public void ArchiveFactory_Open_TarBz2_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2");
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(testFile);
-        });
-
-        Assert.Contains("tar.bz2", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarLz_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.lz");
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(testFile);
-        });
-
-        Assert.Contains("tar.lz", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarBz2Stream_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2");
-        using var stream = File.OpenRead(testFile);
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(stream);
-        });
-
-        Assert.Contains("tar.bz2", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarLzStream_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.lz");
-        using var stream = File.OpenRead(testFile);
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(stream);
-        });
-
-        Assert.Contains("tar.lz", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-}

tests/SharpCompress.Test/Rar/RarArchiveTests.cs

@@ -633,13 +633,4 @@ public class RarArchiveTests : ArchiveTests
             "Rar5.encrypted_filesOnly.rar",
             "Failure jpg exe Empty тест.txt jpg\\test.jpg exe\\test.exe"
         );
-
-    [Fact]
-    public void Rar_TestEncryptedDetection()
-    {
-        using var passwordProtectedFilesArchive = RarArchive.Open(
-            Path.Combine(TEST_ARCHIVES_PATH, "Rar.encrypted_filesOnly.rar")
-        );
-        Assert.True(passwordProtectedFilesArchive.IsEncrypted);
-    }
 }

tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs

@@ -224,15 +224,6 @@ public class SevenZipArchiveTests : ArchiveTests
         );
     }
 
-    [Fact]
-    public void SevenZipArchive_TestEncryptedDetection()
-    {
-        using var passwordProtectedFilesArchive = SevenZipArchive.Open(
-            Path.Combine(TEST_ARCHIVES_PATH, "7Zip.encryptedFiles.7z")
-        );
-        Assert.True(passwordProtectedFilesArchive.IsEncrypted);
-    }
-
     [Fact]
     public void SevenZipArchive_TestSolidDetection()
     {