Merge remote-tracking branch 'origin/master' into copilot/add-performance-benchmarking

# Conflicts:
#	tests/SharpCompress.Performance/packages.lock.json

.editorconfig

@@ -307,6 +307,7 @@ dotnet_diagnostic.CS8602.severity = error
 dotnet_diagnostic.CS8604.severity = error
 dotnet_diagnostic.CS8618.severity = error
 dotnet_diagnostic.CS0618.severity = suggestion
+dotnet_diagnostic.CS1998.severity = error
 dotnet_diagnostic.CS4014.severity = error
 dotnet_diagnostic.CS8600.severity = error
 dotnet_diagnostic.CS8603.severity = error

.gitignore

@@ -4,8 +4,8 @@ _ReSharper.SharpCompress/
 bin/
 *.suo
 *.user
-tests/TestArchives/Scratch/
-tests/TestArchives/Scratch2/
+TestArchives/Scratch/
+TestArchives/Scratch2/
 TestResults/
 *.nupkg
 packages/*/
@@ -20,3 +20,7 @@ artifacts/
 
 .DS_Store
 *.snupkg
+
+# BenchmarkDotNet artifacts
+BenchmarkDotNet.Artifacts/
+**/BenchmarkDotNet.Artifacts/

AGENTS.md

@@ -178,4 +178,5 @@ SharpCompress supports multiple archive and compression formats:
 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

Directory.Build.props

@@ -12,6 +12,5 @@
     <RunAnalyzersDuringBuild>False</RunAnalyzersDuringBuild>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
-    <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
   </PropertyGroup>
 </Project>

Directory.Packages.props

@@ -1,11 +1,11 @@
 <Project>
   <ItemGroup>
+    <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageVersion Include="Bullseye" Version="6.1.0" />
     <PackageVersion Include="AwesomeAssertions" Version="9.3.0" />
     <PackageVersion Include="Glob" Version="1.1.9" />
     <PackageVersion Include="JetBrains.Profiler.SelfApi" Version="2.5.15" />
     <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.0" />
-    <PackageVersion Include="Microsoft.NET.ILLink.Task" Version="10.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Mono.Posix.NETStandard" Version="1.0.0" />
     <PackageVersion Include="SimpleExec" Version="13.0.0" />

SharpCompress.sln

@@ -18,11 +18,12 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Config", "Config", "{CDB425
 		Directory.Build.props = Directory.Build.props
 		global.json = global.json
 		.editorconfig = .editorconfig
-		.gitignore = .gitignore
 		Directory.Packages.props = Directory.Packages.props
 		NuGet.config = NuGet.config
 		.github\workflows\nuget-release.yml = .github\workflows\nuget-release.yml
+		USAGE.md = USAGE.md
 		README.md = README.md
+		FORMATS.md = FORMATS.md
 		AGENTS.md = AGENTS.md
 	EndProjectSection
 EndProject

docs/API.md

@@ -8,49 +8,49 @@ Quick reference for commonly used SharpCompress APIs.
 
 ```csharp
 // Auto-detect format
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     // Works with Zip, Tar, GZip, Rar, 7Zip, etc.
 }
 
 // Specific format - Archive API
-using (var archive = ZipArchive.OpenArchive("file.zip"))
-using (var archive = TarArchive.OpenArchive("file.tar"))
-using (var archive = RarArchive.OpenArchive("file.rar"))
-using (var archive = SevenZipArchive.OpenArchive("file.7z"))
-using (var archive = GZipArchive.OpenArchive("file.gz"))
+using (var archive = ZipArchive.Open("file.zip"))
+using (var archive = TarArchive.Open("file.tar"))
+using (var archive = RarArchive.Open("file.rar"))
+using (var archive = SevenZipArchive.Open("file.7z"))
+using (var archive = GZipArchive.Open("file.gz"))
 
 // With options
-var options = new ReaderOptions
-{
+var options = new ReaderOptions 
+{ 
     Password = "password",
     LeaveStreamOpen = true,
     ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
 };
-using (var archive = ZipArchive.OpenArchive("encrypted.zip", options))
+using (var archive = ZipArchive.Open("encrypted.zip", options))
 ```
 
 ### Creating Archives
 
 ```csharp
 // Writer Factory
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Zip, CompressionType.Deflate))
+using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, CompressionType.Deflate))
 {
     // Write entries
 }
 
 // Specific writer
-using (var archive = ZipArchive.CreateArchive())
-using (var archive = TarArchive.CreateArchive())
-using (var archive = GZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
+using (var archive = TarArchive.Create())
+using (var archive = GZipArchive.Create())
 
 // With options
-var options = new WriterOptions(CompressionType.Deflate)
-{
+var options = new WriterOptions(CompressionType.Deflate) 
+{ 
     CompressionLevel = 9,
     LeaveStreamOpen = false
 };
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.SaveTo("output.zip", options);
 }
@@ -63,26 +63,26 @@ using (var archive = ZipArchive.CreateArchive())
 ### Reading/Extracting
 
 ```csharp
-using (var archive = ZipArchive.OpenArchive("file.zip"))
+using (var archive = ZipArchive.Open("file.zip"))
 {
     // Get all entries
-    IEnumerable<IArchiveEntry> entries = archive.Entries;
-
+    IEnumerable<IEntry> entries = archive.Entries;
+    
     // Find specific entry
     var entry = archive.Entries.FirstOrDefault(e => e.Key == "file.txt");
-
+    
     // Extract all
     archive.WriteToDirectory(@"C:\output", new ExtractionOptions
     {
         ExtractFullPath = true,
         Overwrite = true
     });
-
+    
     // Extract single entry
     var entry = archive.Entries.First();
     entry.WriteToFile(@"C:\output\file.txt");
     entry.WriteToFile(@"C:\output\file.txt", new ExtractionOptions { Overwrite = true });
-
+    
     // Get entry stream
     using (var stream = entry.OpenEntryStream())
     {
@@ -90,15 +90,8 @@ using (var archive = ZipArchive.OpenArchive("file.zip"))
     }
 }
 
-// Async extraction (requires IAsyncArchive)
-using (var asyncArchive = await ZipArchive.OpenAsyncArchive("file.zip"))
-{
-    await asyncArchive.WriteToDirectoryAsync(
-        @"C:\output",
-        new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
-        cancellationToken: cancellationToken
-    );
-}
+// Async variants
+await archive.WriteToDirectoryAsync(@"C:\output", options, cancellationToken);
 using (var stream = await entry.OpenEntryStreamAsync(cancellationToken))
 {
     // ...
@@ -122,18 +115,18 @@ foreach (var entry in archive.Entries)
 ### Creating Archives
 
 ```csharp
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     // Add file
-    archive.AddEntry("file.txt", @"C:\source\file.txt");
-
+    archive.AddEntry("file.txt", "C:\\source\\file.txt");
+    
     // Add multiple files
-    archive.AddAllFromDirectory(@"C:\source");
-    archive.AddAllFromDirectory(@"C:\source", "*.txt");  // Pattern
-
+    archive.AddAllFromDirectory("C:\\source");
+    archive.AddAllFromDirectory("C:\\source", "*.txt");  // Pattern
+    
     // Save to file
     archive.SaveTo("output.zip", CompressionType.Deflate);
-
+    
     // Save to stream
     archive.SaveTo(outputStream, new WriterOptions(CompressionType.Deflate)
     {
@@ -151,18 +144,18 @@ using (var archive = ZipArchive.CreateArchive())
 
 ```csharp
 using (var stream = File.OpenRead("file.zip"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {
-        IArchiveEntry entry = reader.Entry;
-
+        IEntry entry = reader.Entry;
+        
         if (!entry.IsDirectory)
         {
             // Extract entry
             reader.WriteEntryToDirectory(@"C:\output");
             reader.WriteEntryToFile(@"C:\output\file.txt");
-
+            
             // Or get stream
             using (var entryStream = reader.OpenEntryStream())
             {
@@ -172,25 +165,16 @@ using (var reader = ReaderFactory.OpenReader(stream))
     }
 }
 
-// Async variants (use OpenAsyncReader to get IAsyncReader)
-using (var stream = File.OpenRead("file.zip"))
-using (var reader = await ReaderFactory.OpenAsyncReader(stream))
+// Async variants
+while (await reader.MoveToNextEntryAsync())
 {
-    while (await reader.MoveToNextEntryAsync())
-    {
-        await reader.WriteEntryToFileAsync(
-            @"C:\output\" + reader.Entry.Key,
-            cancellationToken: cancellationToken
-        );
-    }
-
-    // Async extraction of all entries
-    await reader.WriteAllToDirectoryAsync(
-        @"C:\output",
-        new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
-        cancellationToken
-    );
+    await reader.WriteEntryToFileAsync(@"C:\output\" + reader.Entry.Key, cancellationToken);
 }
+
+// Async extraction
+await reader.WriteAllToDirectoryAsync(@"C:\output", 
+    new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
+    cancellationToken);
 ```
 
 ---
@@ -201,7 +185,7 @@ using (var reader = await ReaderFactory.OpenAsyncReader(stream))
 
 ```csharp
 using (var stream = File.Create("output.zip"))
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Zip, CompressionType.Deflate))
+using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, CompressionType.Deflate))
 {
     // Write single file
     using (var fileStream = File.OpenRead("source.txt"))
@@ -239,7 +223,7 @@ var options = new ReaderOptions
         Default = Encoding.GetEncoding(932)
     }
 };
-using (var archive = ZipArchive.OpenArchive("file.zip", options))
+using (var archive = ZipArchive.Open("file.zip", options))
 {
     // ...
 }
@@ -278,20 +262,15 @@ archive.WriteToDirectory(@"C:\output", options);
 // For creating archives
 CompressionType.None       // No compression (store)
 CompressionType.Deflate    // DEFLATE (default for ZIP/GZip)
-CompressionType.Deflate64  // Deflate64
 CompressionType.BZip2      // BZip2
 CompressionType.LZMA       // LZMA (for 7Zip, LZip, XZ)
 CompressionType.PPMd       // PPMd (for ZIP)
 CompressionType.Rar        // RAR compression (read-only)
-CompressionType.ZStandard  // ZStandard
-ArchiveType.Arc
-ArchiveType.Arj
-ArchiveType.Ace
 
-// For Tar archives with compression
-// Use WriterFactory to create compressed tar archives
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Tar, CompressionType.GZip))  // Tar.GZip
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Tar, CompressionType.BZip2)) // Tar.BZip2
+// For Tar archives
+// Use CompressionType in TarWriter constructor
+using (var writer = TarWriter(stream, CompressionType.GZip))  // Tar.GZip
+using (var writer = TarWriter(stream, CompressionType.BZip2)) // Tar.BZip2
 ```
 
 ### Archive Types
@@ -349,7 +328,7 @@ var progress = new Progress<ProgressReport>(report =>
 });
 
 var options = new ReaderOptions { Progress = progress };
-using (var archive = ZipArchive.OpenArchive("archive.zip", options))
+using (var archive = ZipArchive.Open("archive.zip", options))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -363,13 +342,11 @@ cts.CancelAfter(TimeSpan.FromMinutes(5));
 
 try
 {
-    using (var archive = await ZipArchive.OpenAsyncArchive("archive.zip"))
+    using (var archive = ZipArchive.Open("archive.zip"))
     {
-        await archive.WriteToDirectoryAsync(
-            @"C:\output",
+        await archive.WriteToDirectoryAsync(@"C:\output",
             new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
-            cancellationToken: cts.Token
-        );
+            cts.Token);
     }
 }
 catch (OperationCanceledException)
@@ -381,23 +358,23 @@ catch (OperationCanceledException)
 ### Create with Custom Compression
 
 ```csharp
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.AddAllFromDirectory(@"D:\source");
     
     // Fastest
-    archive.SaveTo("fast.zip", new WriterOptions(CompressionType.Deflate)
-    {
-        CompressionLevel = 1
+    archive.SaveTo("fast.zip", new WriterOptions(CompressionType.Deflate) 
+    { 
+        CompressionLevel = 1 
     });
     
     // Balanced (default)
     archive.SaveTo("normal.zip", CompressionType.Deflate);
     
     // Best compression
-    archive.SaveTo("best.zip", new WriterOptions(CompressionType.Deflate)
-    {
-        CompressionLevel = 9
+    archive.SaveTo("best.zip", new WriterOptions(CompressionType.Deflate) 
+    { 
+        CompressionLevel = 9 
     });
 }
 ```
@@ -406,7 +383,7 @@ using (var archive = ZipArchive.CreateArchive())
 
 ```csharp
 using (var outputStream = new MemoryStream())
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     // Add content from memory
     using (var contentStream = new MemoryStream(Encoding.UTF8.GetBytes("Hello")))
@@ -425,7 +402,7 @@ using (var archive = ZipArchive.CreateArchive())
 ### Extract Specific Files
 
 ```csharp
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     var filesToExtract = new[] { "file1.txt", "file2.txt" };
     
@@ -439,7 +416,7 @@ using (var archive = ZipArchive.OpenArchive("archive.zip"))
 ### List Archive Contents
 
 ```csharp
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     foreach (var entry in archive.Entries)
     {
@@ -459,7 +436,7 @@ using (var archive = ZipArchive.OpenArchive("archive.zip"))
 
 ```csharp
 var stream = File.OpenRead("archive.zip");
-var archive = ZipArchive.OpenArchive(stream);
+var archive = ZipArchive.Open(stream);
 archive.WriteToDirectory(@"C:\output");
 // stream not disposed - leaked resource
 ```
@@ -468,7 +445,7 @@ archive.WriteToDirectory(@"C:\output");
 
 ```csharp
 using (var stream = File.OpenRead("archive.zip"))
-using (var archive = ZipArchive.OpenArchive(stream))
+using (var archive = ZipArchive.Open(stream))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -479,7 +456,7 @@ using (var archive = ZipArchive.OpenArchive(stream))
 
 ```csharp
 // Loading entire archive then iterating
-using (var archive = ZipArchive.OpenArchive("large.zip"))
+using (var archive = ZipArchive.Open("large.zip"))
 {
     var entries = archive.Entries.ToList();  // Loads all in memory
     foreach (var e in entries)
@@ -494,7 +471,7 @@ using (var archive = ZipArchive.OpenArchive("large.zip"))
 ```csharp
 // Streaming iteration
 using (var stream = File.OpenRead("large.zip"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {

docs/ARCHITECTURE.md

@@ -76,7 +76,7 @@ Factory classes for auto-detecting archive format and creating appropriate reade
 - Format-specific: `ZipFactory.cs`, `TarFactory.cs`, `RarFactory.cs`, etc.
 
 **How It Works:**
-1. `ReaderFactory.OpenReader(stream)` probes stream signatures
+1. `ReaderFactory.Open(stream)` probes stream signatures
 2. Identifies format by magic bytes
 3. Creates appropriate reader instance
 4. Returns generic `IReader` interface
@@ -142,7 +142,7 @@ Stream wrappers and utilities.
 **Example:**
 ```csharp
 // User calls factory
-using (var reader = ReaderFactory.OpenReader(stream))  // Returns IReader
+using (var reader = ReaderFactory.Open(stream))  // Returns IReader
 {
     while (reader.MoveToNextEntry())
     {
@@ -175,7 +175,7 @@ CompressionType.LZMA        // LZMA
 CompressionType.PPMd        // PPMd
 
 // Writer uses strategy pattern
-var archive = ZipArchive.CreateArchive();
+var archive = ZipArchive.Create();
 archive.SaveTo("output.zip", CompressionType.Deflate);   // Use Deflate
 archive.SaveTo("output.bz2", CompressionType.BZip2);    // Use BZip2
 ```
@@ -248,7 +248,7 @@ foreach (var entry in entries)
 }
 
 // Reader API - provides iterator
-IReader reader = ReaderFactory.OpenReader(stream);
+IReader reader = ReaderFactory.Open(stream);
 while (reader.MoveToNextEntry())
 {
     // Forward-only iteration - one entry at a time
@@ -381,7 +381,7 @@ public class NewFormatArchive : AbstractArchive
     private NewFormatHeader _header;
     private List<NewFormatEntry> _entries;
     
-    public static NewFormatArchive OpenArchive(Stream stream)
+    public static NewFormatArchive Open(Stream stream)
     {
         var archive = new NewFormatArchive();
         archive._header = NewFormatHeader.Read(stream);
@@ -442,8 +442,8 @@ public class NewFormatFactory : Factory, IArchiveFactory, IReaderFactory
     
     public static NewFormatFactory Instance { get; } = new();
     
-    public IArchive CreateArchive(Stream stream)
-        => NewFormatArchive.OpenArchive(stream);
+    public IArchive CreateArchive(Stream stream) 
+        => NewFormatArchive.Open(stream);
     
     public IReader CreateReader(Stream stream, ReaderOptions options)
         => new NewFormatReader(stream) { Options = options };
@@ -481,7 +481,7 @@ public class NewFormatTests : TestBase
     public void NewFormat_Extracts_Successfully()
     {
         var archivePath = Path.Combine(TEST_ARCHIVES_PATH, "archive.newformat");
-        using (var archive = NewFormatArchive.OpenArchive(archivePath))
+        using (var archive = NewFormatArchive.Open(archivePath))
         {
             archive.WriteToDirectory(SCRATCH_FILES_PATH);
             // Assert extraction
@@ -561,7 +561,7 @@ public class CustomStream : Stream
 ```csharp
 // Correct: Nested using blocks
 using (var fileStream = File.OpenRead("archive.zip"))
-using (var archive = ZipArchive.OpenArchive(fileStream))
+using (var archive = ZipArchive.Open(fileStream))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -570,7 +570,7 @@ using (var archive = ZipArchive.OpenArchive(fileStream))
 // Correct: Using with options
 var options = new ReaderOptions { LeaveStreamOpen = true };
 var stream = File.OpenRead("archive.zip");
-using (var archive = ZipArchive.OpenArchive(stream, options))
+using (var archive = ZipArchive.Open(stream, options))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -641,7 +641,7 @@ public void Archive_Extraction_Works()
     var testArchive = Path.Combine(TEST_ARCHIVES_PATH, "test.zip");
     
     // Act
-    using (var archive = ZipArchive.OpenArchive(testArchive))
+    using (var archive = ZipArchive.Open(testArchive))
     {
         archive.WriteToDirectory(SCRATCH_FILES_PATH);
     }

docs/ENCODING.md

@@ -27,7 +27,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("japanese.zip", options))
+using (var archive = ZipArchive.Open("japanese.zip", options))
 {
     foreach (var entry in archive.Entries)
     {
@@ -51,7 +51,7 @@ var options = new ReaderOptions
 {
     ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
 };
-using (var archive = ZipArchive.OpenArchive("file.zip", options))
+using (var archive = ZipArchive.Open("file.zip", options))
 {
     // Use archive with correct encoding
 }
@@ -64,7 +64,7 @@ var options = new ReaderOptions
     ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
 };
 using (var stream = File.OpenRead("file.zip"))
-using (var reader = ReaderFactory.OpenReader(stream, options))
+using (var reader = ReaderFactory.Open(stream, options))
 {
     while (reader.MoveToNextEntry())
     {
@@ -89,7 +89,7 @@ var options = new ReaderOptions
         Default = Encoding.GetEncoding(932)
     }
 };
-using (var archive = ZipArchive.OpenArchive("japanese.zip", options))
+using (var archive = ZipArchive.Open("japanese.zip", options))
 {
     // Correctly decodes Japanese filenames
 }
@@ -266,7 +266,7 @@ SharpCompress attempts to auto-detect encoding, but this isn't always reliable:
 
 ```csharp
 // Auto-detection (default)
-using (var archive = ZipArchive.OpenArchive("file.zip"))  // Uses UTF8 by default
+using (var archive = ZipArchive.Open("file.zip"))  // Uses UTF8 by default
 {
     // May show corrupted characters if archive uses different encoding
 }
@@ -276,7 +276,7 @@ var options = new ReaderOptions
 {
     ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
 };
-using (var archive = ZipArchive.OpenArchive("file.zip", options))
+using (var archive = ZipArchive.Open("file.zip", options))
 {
     // Correct characters displayed
 }
@@ -324,7 +324,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("mixed.zip", options))
+using (var archive = ZipArchive.Open("mixed.zip", options))
 {
     foreach (var entry in archive.Entries)
     {
@@ -388,7 +388,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("japanese_files.zip", options))
+using (var archive = ZipArchive.Open("japanese_files.zip", options))
 {
     archive.WriteToDirectory(@"C:\output", new ExtractionOptions
     {
@@ -410,7 +410,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("french_files.zip", options))
+using (var archive = ZipArchive.Open("french_files.zip", options))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -428,7 +428,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("chinese_files.zip", options))
+using (var archive = ZipArchive.Open("chinese_files.zip", options))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -445,7 +445,7 @@ var options = new ReaderOptions
     }
 };
 
-using (var archive = ZipArchive.OpenArchive("russian_files.zip", options))
+using (var archive = ZipArchive.Open("russian_files.zip", options))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -463,7 +463,7 @@ var options = new ReaderOptions
 };
 
 using (var stream = File.OpenRead("japanese.zip"))
-using (var reader = ReaderFactory.OpenReader(stream, options))
+using (var reader = ReaderFactory.Open(stream, options))
 {
     while (reader.MoveToNextEntry())
     {
@@ -484,7 +484,7 @@ When creating archives, SharpCompress uses UTF8 by default (recommended):
 
 ```csharp
 // Create with UTF8 (default, recommended)
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.AddAllFromDirectory(@"D:\my_files");
     archive.SaveTo("output.zip", CompressionType.Deflate);

docs/PERFORMANCE.md

@@ -24,7 +24,7 @@ Choose the right API based on your use case:
 // - You need random access to entries
 // - Stream is seekable (file, MemoryStream)
 
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     // Random access - all entries available
     var specific = archive.Entries.FirstOrDefault(e => e.Key == "file.txt");
@@ -51,7 +51,7 @@ using (var archive = ZipArchive.OpenArchive("archive.zip"))
 // - Forward-only processing is acceptable
 
 using (var stream = File.OpenRead("large.zip"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {
@@ -129,7 +129,7 @@ For processing archives from downloads or pipes:
 ```csharp
 // Download stream (non-seekable)
 using (var httpStream = await httpClient.GetStreamAsync(url))
-using (var reader = ReaderFactory.OpenReader(httpStream))
+using (var reader = ReaderFactory.Open(httpStream))
 {
     // Process entries as they arrive
     while (reader.MoveToNextEntry())
@@ -159,14 +159,14 @@ Choose based on your constraints:
 ```csharp
 // Download then extract (requires disk space)
 var archivePath = await DownloadFile(url, @"C:\temp\archive.zip");
-using (var archive = ZipArchive.OpenArchive(archivePath))
+using (var archive = ZipArchive.Open(archivePath))
 {
     archive.WriteToDirectory(@"C:\output");
 }
 
 // Stream during download (on-the-fly extraction)
 using (var httpStream = await httpClient.GetStreamAsync(url))
-using (var reader = ReaderFactory.OpenReader(httpStream))
+using (var reader = ReaderFactory.Open(httpStream))
 {
     while (reader.MoveToNextEntry())
     {
@@ -198,7 +198,7 @@ Extracting File3 requires decompressing File1 and File2 first.
 
 **Random Extraction (Slow):**
 ```csharp
-using (var archive = RarArchive.OpenArchive("solid.rar"))
+using (var archive = RarArchive.Open("solid.rar"))
 {
     foreach (var entry in archive.Entries)
     {
@@ -210,7 +210,7 @@ using (var archive = RarArchive.OpenArchive("solid.rar"))
 
 **Sequential Extraction (Fast):**
 ```csharp
-using (var archive = RarArchive.OpenArchive("solid.rar"))
+using (var archive = RarArchive.Open("solid.rar"))
 {
     // Method 1: Use WriteToDirectory (recommended)
     archive.WriteToDirectory(@"C:\output", new ExtractionOptions
@@ -256,7 +256,7 @@ using (var archive = RarArchive.OpenArchive("solid.rar"))
 // Level 9 = Slowest, best compression
 
 // Write with different compression levels
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.AddAllFromDirectory(@"D:\data");
     
@@ -293,7 +293,7 @@ using (var archive = ZipArchive.CreateArchive())
 // Smaller block size = lower memory, faster
 // Larger block size = better compression, slower
 
-using (var archive = TarArchive.CreateArchive())
+using (var archive = TarArchive.Create())
 {
     archive.AddAllFromDirectory(@"D:\data");
     
@@ -313,7 +313,7 @@ LZMA compression is very powerful but memory-intensive:
 // - Better compression: larger dictionary
 
 // Preset via CompressionType
-using (var archive = TarArchive.CreateArchive())
+using (var archive = TarArchive.Create())
 {
     archive.AddAllFromDirectory(@"D:\data");
     archive.SaveTo("archive.tar.xz", CompressionType.LZMA);  // Default settings
@@ -333,7 +333,7 @@ Async is beneficial when:
 
 ```csharp
 // Async extraction (non-blocking)
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     await archive.WriteToDirectoryAsync(
         @"C:\output",
@@ -353,7 +353,7 @@ Async doesn't improve performance for:
 
 ```csharp
 // Sync extraction (simpler, same performance on fast I/O)
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     archive.WriteToDirectory(
         @"C:\output",
@@ -373,7 +373,7 @@ cts.CancelAfter(TimeSpan.FromMinutes(5));
 
 try
 {
-    using (var archive = ZipArchive.OpenArchive("archive.zip"))
+    using (var archive = ZipArchive.Open("archive.zip"))
     {
         await archive.WriteToDirectoryAsync(
             @"C:\output",
@@ -408,14 +408,14 @@ catch (OperationCanceledException)
 // ✗ Slow - opens each archive separately
 foreach (var file in files)
 {
-    using (var archive = ZipArchive.OpenArchive("archive.zip"))
+    using (var archive = ZipArchive.Open("archive.zip"))
     {
         archive.WriteToDirectory(@"C:\output");
     }
 }
 
 // ✓ Better - process multiple entries at once
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     archive.WriteToDirectory(@"C:\output");
 }
@@ -425,7 +425,7 @@ using (var archive = ZipArchive.OpenArchive("archive.zip"))
 
 ```csharp
 var sw = Stopwatch.StartNew();
-using (var archive = ZipArchive.OpenArchive("large.zip"))
+using (var archive = ZipArchive.Open("large.zip"))
 {
     archive.WriteToDirectory(@"C:\output");
 }

docs/USAGE.md

@@ -48,7 +48,7 @@ Also, look over the tests for more thorough [examples](https://github.com/adamha
 
 ### Create Zip Archive from multiple files
 ```C#
-using(var archive = ZipArchive.CreateArchive())
+using(var archive = ZipArchive.Create())
 {
     archive.AddEntry("file01.txt", "C:\\file01.txt");
     archive.AddEntry("file02.txt", "C:\\file02.txt");
@@ -61,7 +61,7 @@ using(var archive = ZipArchive.CreateArchive())
 ### Create Zip Archive from all files in a directory to a file
 
 ```C#
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.AddAllFromDirectory("D:\\temp");
     archive.SaveTo("C:\\temp.zip", CompressionType.Deflate);
@@ -72,7 +72,7 @@ using (var archive = ZipArchive.CreateArchive())
 
 ```C#
 var memoryStream = new MemoryStream();
-using (var archive = ZipArchive.CreateArchive())
+using (var archive = ZipArchive.Create())
 {
     archive.AddAllFromDirectory("D:\\temp");
     archive.SaveTo(memoryStream, new WriterOptions(CompressionType.Deflate)
@@ -90,7 +90,7 @@ Note: Extracting a solid rar or 7z file needs to be done in sequential order to
 `ExtractAllEntries` is primarily intended for solid archives (like solid Rar) or 7Zip archives, where sequential extraction provides the best performance. For general/simple extraction with any supported archive type, use `archive.WriteToDirectory()` instead.
 
 ```C#
-using (var archive = RarArchive.OpenArchive("Test.rar"))
+using (var archive = RarArchive.Open("Test.rar"))
 {
     // Simple extraction with RarArchive; this WriteToDirectory pattern works for all archive types
     archive.WriteToDirectory(@"D:\temp", new ExtractionOptions()
@@ -104,7 +104,7 @@ using (var archive = RarArchive.OpenArchive("Test.rar"))
 ### Iterate over all files from a Rar file using RarArchive
 
 ```C#
-using (var archive = RarArchive.OpenArchive("Test.rar"))
+using (var archive = RarArchive.Open("Test.rar"))
 {
     foreach (var entry in archive.Entries.Where(entry => !entry.IsDirectory))
     {
@@ -126,7 +126,7 @@ var progress = new Progress<ProgressReport>(report =>
     Console.WriteLine($"Extracting {report.EntryPath}: {report.PercentComplete}%");
 });
 
-using (var archive = RarArchive.OpenArchive("archive.rar", new ReaderOptions { Progress = progress })) // Must be solid Rar or 7Zip
+using (var archive = RarArchive.Open("archive.rar", new ReaderOptions { Progress = progress })) // Must be solid Rar or 7Zip
 {
     archive.WriteToDirectory(@"D:\output", new ExtractionOptions()
     {
@@ -140,7 +140,7 @@ using (var archive = RarArchive.OpenArchive("archive.rar", new ReaderOptions { P
 
 ```C#
 using (Stream stream = File.OpenRead("Tar.tar.bz2"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {
@@ -161,7 +161,7 @@ using (var reader = ReaderFactory.OpenReader(stream))
 
 ```C#
 using (Stream stream = File.OpenRead("Tar.tar.bz2"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {
@@ -180,7 +180,7 @@ using (var reader = ReaderFactory.OpenReader(stream))
 
 ```C#
 using (Stream stream = File.OpenWrite("C:\\temp.tgz"))
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Tar, new WriterOptions(CompressionType.GZip)
+using (var writer = WriterFactory.Open(stream, ArchiveType.Tar, new WriterOptions(CompressionType.GZip)
                                                 {
                                                     LeaveOpenStream = true
                                                 }))
@@ -199,7 +199,7 @@ opts.ArchiveEncoding.CustomDecoder = (data, x, y) =>
 {
     return encoding.GetString(data);
 };
-var tr = SharpCompress.Archives.Zip.ZipArchive.OpenArchive("test.zip", opts);
+var tr = SharpCompress.Archives.Zip.ZipArchive.Open("test.zip", opts);
 foreach(var entry in tr.Entries)
 {
     Console.WriteLine($"{entry.Key}");
@@ -213,7 +213,7 @@ foreach(var entry in tr.Entries)
 **Extract single entry asynchronously:**
 ```C#
 using (Stream stream = File.OpenRead("archive.zip"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     while (reader.MoveToNextEntry())
     {
@@ -234,7 +234,7 @@ using (var reader = ReaderFactory.OpenReader(stream))
 **Extract all entries asynchronously:**
 ```C#
 using (Stream stream = File.OpenRead("archive.tar.gz"))
-using (var reader = ReaderFactory.OpenReader(stream))
+using (var reader = ReaderFactory.Open(stream))
 {
     await reader.WriteAllToDirectoryAsync(
         @"D:\temp",
@@ -250,7 +250,7 @@ using (var reader = ReaderFactory.OpenReader(stream))
 
 **Open and process entry stream asynchronously:**
 ```C#
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     foreach (var entry in archive.Entries.Where(e => !e.IsDirectory))
     {
@@ -268,7 +268,7 @@ using (var archive = ZipArchive.OpenArchive("archive.zip"))
 **Write single file asynchronously:**
 ```C#
 using (Stream archiveStream = File.OpenWrite("output.zip"))
-using (var writer = WriterFactory.OpenWriter(archiveStream, ArchiveType.Zip, CompressionType.Deflate))
+using (var writer = WriterFactory.Open(archiveStream, ArchiveType.Zip, CompressionType.Deflate))
 {
     using (Stream fileStream = File.OpenRead("input.txt"))
     {
@@ -280,7 +280,7 @@ using (var writer = WriterFactory.OpenWriter(archiveStream, ArchiveType.Zip, Com
 **Write entire directory asynchronously:**
 ```C#
 using (Stream stream = File.OpenWrite("backup.tar.gz"))
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Tar, new WriterOptions(CompressionType.GZip)))
+using (var writer = WriterFactory.Open(stream, ArchiveType.Tar, new WriterOptions(CompressionType.GZip)))
 {
     await writer.WriteAllAsync(
         @"D:\files",
@@ -299,7 +299,7 @@ var cts = new CancellationTokenSource();
 cts.CancelAfter(TimeSpan.FromMinutes(5));
 
 using (Stream stream = File.OpenWrite("archive.zip"))
-using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Zip, CompressionType.Deflate))
+using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, CompressionType.Deflate))
 {
     try
     {
@@ -316,7 +316,7 @@ using (var writer = WriterFactory.OpenWriter(stream, ArchiveType.Zip, Compressio
 
 **Extract from archive asynchronously:**
 ```C#
-using (var archive = ZipArchive.OpenArchive("archive.zip"))
+using (var archive = ZipArchive.Open("archive.zip"))
 {
     // Simple async extraction - works for all archive types
     await archive.WriteToDirectoryAsync(

src/SharpCompress/Algorithms/Adler32.cs

@@ -1,7 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETSTANDARD2_1 && !NETFRAMEWORK
 #define SUPPORTS_RUNTIME_INTRINSICS
 #define SUPPORTS_HOTPATH
 #endif

src/SharpCompress/Archives/AbstractArchive.cs

@@ -68,7 +68,7 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IAsyncArchive
     /// <summary>
     /// The total size of the files as uncompressed in the archive.
     /// </summary>
-    public virtual long TotalUncompressedSize =>
+    public virtual long TotalUncompressSize =>
         Entries.Aggregate(0L, (total, cf) => total + cf.Size);
 
     protected abstract IEnumerable<TVolume> LoadVolumes(SourceStream sourceStream);
@@ -145,19 +145,6 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IAsyncArchive
     /// </summary>
     public virtual bool IsEncrypted => false;
 
-    /// <summary>
-    /// Returns whether multi-threaded extraction is supported for this archive.
-    /// Multi-threading is supported when:
-    /// 1. The archive is opened from a FileInfo or file path (not a stream)
-    /// 2. Multi-threading is explicitly enabled in ReaderOptions
-    /// 3. The archive is not SOLID (SOLID archives should use sequential extraction)
-    /// </summary>
-    public virtual bool SupportsMultiThreadedExtraction =>
-        _sourceStream is not null
-        && _sourceStream.IsFileMode
-        && ReaderOptions.EnableMultiThreadedExtraction
-        && !IsSolid;
-
     /// <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>
@@ -200,26 +187,10 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IAsyncArchive
     }
 
     public virtual IAsyncEnumerable<TEntry> EntriesAsync => _lazyEntriesAsync;
+    IAsyncEnumerable<IArchiveEntry> IAsyncArchive.EntriesAsync =>
+        EntriesAsync.Cast<TEntry, IArchiveEntry>();
 
-    private async IAsyncEnumerable<IArchiveEntry> EntriesAsyncCast()
-    {
-        await foreach (var entry in EntriesAsync)
-        {
-            yield return entry;
-        }
-    }
-
-    IAsyncEnumerable<IArchiveEntry> IAsyncArchive.EntriesAsync => EntriesAsyncCast();
-
-    private async IAsyncEnumerable<IVolume> VolumesAsyncCast()
-    {
-        await foreach (var volume in VolumesAsync)
-        {
-            yield return volume;
-        }
-    }
-
-    public IAsyncEnumerable<IVolume> VolumesAsync => VolumesAsyncCast();
+    public IAsyncEnumerable<IVolume> VolumesAsync => _lazyVolumesAsync.Cast<TVolume, IVolume>();
 
     public async ValueTask<IAsyncReader> ExtractAllEntriesAsync()
     {
@@ -238,16 +209,14 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IAsyncArchive
     public async ValueTask<bool> IsCompleteAsync()
     {
         await EnsureEntriesLoadedAsync();
-        return await EntriesAsync.AllAsync(x => x.IsComplete);
+        return await EntriesAsync.All(x => x.IsComplete);
     }
 
     public async ValueTask<long> TotalSizeAsync() =>
-        await EntriesAsync.AggregateAsync(0L, (total, cf) => total + cf.CompressedSize);
+        await EntriesAsync.Aggregate(0L, (total, cf) => total + cf.CompressedSize);
 
-    public async ValueTask<long> TotalUncompressedSizeAsync() =>
-        await EntriesAsync.AggregateAsync(0L, (total, cf) => total + cf.Size);
-
-    public ValueTask<bool> IsEncryptedAsync() => new(IsEncrypted);
+    public async ValueTask<long> TotalUncompressSizeAsync() =>
+        await EntriesAsync.Aggregate(0L, (total, cf) => total + cf.Size);
 
     #endregion
 }

src/SharpCompress/Archives/AbstractWritableArchive.cs

@@ -12,8 +12,7 @@ namespace SharpCompress.Archives;
 
 public abstract class AbstractWritableArchive<TEntry, TVolume>
     : AbstractArchive<TEntry, TVolume>,
-        IWritableArchive,
-        IWritableAsyncArchive
+        IWritableArchive
     where TEntry : IArchiveEntry
     where TVolume : IVolume
 {
@@ -84,12 +83,12 @@ public abstract class AbstractWritableArchive<TEntry, TVolume>
         }
     }
 
-    void IWritableArchiveCommon.RemoveEntry(IArchiveEntry entry) => RemoveEntry((TEntry)entry);
+    void IWritableArchive.RemoveEntry(IArchiveEntry entry) => RemoveEntry((TEntry)entry);
 
     public TEntry AddEntry(string key, Stream source, long size = 0, DateTime? modified = null) =>
         AddEntry(key, source, false, size, modified);
 
-    IArchiveEntry IWritableArchiveCommon.AddEntry(
+    IArchiveEntry IWritableArchive.AddEntry(
         string key,
         Stream source,
         bool closeStream,
@@ -97,7 +96,7 @@ public abstract class AbstractWritableArchive<TEntry, TVolume>
         DateTime? modified
     ) => AddEntry(key, source, closeStream, size, modified);
 
-    IArchiveEntry IWritableArchiveCommon.AddDirectoryEntry(string key, DateTime? modified) =>
+    IArchiveEntry IWritableArchive.AddDirectoryEntry(string key, DateTime? modified) =>
         AddDirectoryEntry(key, modified);
 
     public TEntry AddEntry(

src/SharpCompress/Archives/ArchiveFactory.cs

@@ -13,14 +13,27 @@ namespace SharpCompress.Archives;
 
 public static class ArchiveFactory
 {
-    public static IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
+    /// <summary>
+    /// Opens an Archive for random access
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <returns></returns>
+    public static IArchive Open(Stream stream, ReaderOptions? readerOptions = null)
     {
         readerOptions ??= new ReaderOptions();
         stream = SharpCompressStream.Create(stream, bufferSize: readerOptions.BufferSize);
-        return FindFactory<IArchiveFactory>(stream).OpenArchive(stream, readerOptions);
+        return FindFactory<IArchiveFactory>(stream).Open(stream, readerOptions);
     }
 
-    public static async ValueTask<IAsyncArchive> OpenAsyncArchive(
+    /// <summary>
+    /// Opens an Archive for random access asynchronously
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    public static async ValueTask<IAsyncArchive> OpenAsync(
         Stream stream,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
@@ -28,11 +41,14 @@ public static class ArchiveFactory
     {
         readerOptions ??= new ReaderOptions();
         stream = SharpCompressStream.Create(stream, bufferSize: readerOptions.BufferSize);
-        var factory = await FindFactoryAsync<IArchiveFactory>(stream, cancellationToken);
-        return factory.OpenAsyncArchive(stream, readerOptions);
+        var factory = await FindFactoryAsync<IArchiveFactory>(stream, cancellationToken)
+            .ConfigureAwait(false);
+        return await factory
+            .OpenAsync(stream, readerOptions, cancellationToken)
+            .ConfigureAwait(false);
     }
 
-    public static IWritableArchive CreateArchive(ArchiveType type)
+    public static IWritableArchive Create(ArchiveType type)
     {
         var factory = Factory
             .Factories.OfType<IWriteableArchiveFactory>()
@@ -40,36 +56,58 @@ public static class ArchiveFactory
 
         if (factory != null)
         {
-            return factory.CreateArchive();
+            return factory.CreateWriteableArchive();
         }
 
         throw new NotSupportedException("Cannot create Archives of type: " + type);
     }
 
-    public static IArchive OpenArchive(string filePath, ReaderOptions? options = null)
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="options"></param>
+    public static IArchive Open(string filePath, ReaderOptions? options = null)
     {
         filePath.NotNullOrEmpty(nameof(filePath));
-        return OpenArchive(new FileInfo(filePath), options);
+        return Open(new FileInfo(filePath), options);
     }
 
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    /// <summary>
+    /// Opens an Archive from a filepath asynchronously.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
         string filePath,
         ReaderOptions? options = null,
         CancellationToken cancellationToken = default
     )
     {
         filePath.NotNullOrEmpty(nameof(filePath));
-        return OpenAsyncArchive(new FileInfo(filePath), options, cancellationToken);
+        return OpenAsync(new FileInfo(filePath), options, cancellationToken);
     }
 
-    public static IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? options = null)
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="options"></param>
+    public static IArchive Open(FileInfo fileInfo, ReaderOptions? options = null)
     {
         options ??= new ReaderOptions { LeaveStreamOpen = false };
 
-        return FindFactory<IArchiveFactory>(fileInfo).OpenArchive(fileInfo, options);
+        return FindFactory<IArchiveFactory>(fileInfo).Open(fileInfo, options);
     }
 
-    public static async ValueTask<IAsyncArchive> OpenAsyncArchive(
+    /// <summary>
+    /// Opens an Archive from a FileInfo object asynchronously.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? options = null,
         CancellationToken cancellationToken = default
@@ -77,14 +115,17 @@ public static class ArchiveFactory
     {
         options ??= new ReaderOptions { LeaveStreamOpen = false };
 
-        var factory = await FindFactoryAsync<IArchiveFactory>(fileInfo, cancellationToken);
-        return factory.OpenAsyncArchive(fileInfo, options, cancellationToken);
+        var factory = await FindFactoryAsync<IArchiveFactory>(fileInfo, cancellationToken)
+            .ConfigureAwait(false);
+        return await factory.OpenAsync(fileInfo, options, cancellationToken).ConfigureAwait(false);
     }
 
-    public static IArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? options = null
-    )
+    /// <summary>
+    /// Constructor with IEnumerable FileInfo objects, multi and split support.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="options"></param>
+    public static IArchive Open(IEnumerable<FileInfo> fileInfos, ReaderOptions? options = null)
     {
         fileInfos.NotNull(nameof(fileInfos));
         var filesArray = fileInfos.ToArray();
@@ -96,16 +137,22 @@ public static class ArchiveFactory
         var fileInfo = filesArray[0];
         if (filesArray.Length == 1)
         {
-            return OpenArchive(fileInfo, options);
+            return Open(fileInfo, options);
         }
 
         fileInfo.NotNull(nameof(fileInfo));
         options ??= new ReaderOptions { LeaveStreamOpen = false };
 
-        return FindFactory<IMultiArchiveFactory>(fileInfo).OpenArchive(filesArray, options);
+        return FindFactory<IMultiArchiveFactory>(fileInfo).Open(filesArray, options);
     }
 
-    public static async ValueTask<IAsyncArchive> OpenAsyncArchive(
+    /// <summary>
+    /// Opens a multi-part archive from files asynchronously.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async ValueTask<IAsyncArchive> OpenAsync(
         IEnumerable<FileInfo> fileInfos,
         ReaderOptions? options = null,
         CancellationToken cancellationToken = default
@@ -121,17 +168,24 @@ public static class ArchiveFactory
         var fileInfo = filesArray[0];
         if (filesArray.Length == 1)
         {
-            return await OpenAsyncArchive(fileInfo, options, cancellationToken);
+            return await OpenAsync(fileInfo, options, cancellationToken).ConfigureAwait(false);
         }
 
         fileInfo.NotNull(nameof(fileInfo));
         options ??= new ReaderOptions { LeaveStreamOpen = false };
 
-        var factory = await FindFactoryAsync<IMultiArchiveFactory>(fileInfo, cancellationToken);
-        return factory.OpenAsyncArchive(filesArray, options, cancellationToken);
+        var factory = FindFactory<IMultiArchiveFactory>(fileInfo);
+        return await factory
+            .OpenAsync(filesArray, options, cancellationToken)
+            .ConfigureAwait(false);
     }
 
-    public static IArchive OpenArchive(IEnumerable<Stream> streams, ReaderOptions? options = null)
+    /// <summary>
+    /// Constructor with IEnumerable FileInfo objects, multi and split support.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="options"></param>
+    public static IArchive Open(IEnumerable<Stream> streams, ReaderOptions? options = null)
     {
         streams.NotNull(nameof(streams));
         var streamsArray = streams.ToArray();
@@ -143,16 +197,22 @@ public static class ArchiveFactory
         var firstStream = streamsArray[0];
         if (streamsArray.Length == 1)
         {
-            return OpenArchive(firstStream, options);
+            return Open(firstStream, options);
         }
 
         firstStream.NotNull(nameof(firstStream));
         options ??= new ReaderOptions();
 
-        return FindFactory<IMultiArchiveFactory>(firstStream).OpenArchive(streamsArray, options);
+        return FindFactory<IMultiArchiveFactory>(firstStream).Open(streamsArray, options);
     }
 
-    public static async ValueTask<IAsyncArchive> OpenAsyncArchive(
+    /// <summary>
+    /// Opens a multi-part archive from streams asynchronously.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="options"></param>
+    /// <param name="cancellationToken"></param>
+    public static async ValueTask<IAsyncArchive> OpenAsync(
         IEnumerable<Stream> streams,
         ReaderOptions? options = null,
         CancellationToken cancellationToken = default
@@ -169,23 +229,28 @@ public static class ArchiveFactory
         var firstStream = streamsArray[0];
         if (streamsArray.Length == 1)
         {
-            return await OpenAsyncArchive(firstStream, options, cancellationToken);
+            return await OpenAsync(firstStream, options, cancellationToken).ConfigureAwait(false);
         }
 
         firstStream.NotNull(nameof(firstStream));
         options ??= new ReaderOptions();
 
         var factory = FindFactory<IMultiArchiveFactory>(firstStream);
-        return factory.OpenAsyncArchive(streamsArray, options);
+        return await factory
+            .OpenAsync(streamsArray, options, cancellationToken)
+            .ConfigureAwait(false);
     }
 
+    /// <summary>
+    /// Extract to specific directory, retaining filename
+    /// </summary>
     public static void WriteToDirectory(
         string sourceArchive,
         string destinationDirectory,
         ExtractionOptions? options = null
     )
     {
-        using var archive = OpenArchive(sourceArchive);
+        using var archive = Open(sourceArchive);
         archive.WriteToDirectory(destinationDirectory, options);
     }
 
@@ -317,12 +382,22 @@ public static class ArchiveFactory
         return false;
     }
 
+    /// <summary>
+    /// From a passed in archive (zip, rar, 7z, 001), return all parts.
+    /// </summary>
+    /// <param name="part1"></param>
+    /// <returns></returns>
     public static IEnumerable<string> GetFileParts(string part1)
     {
         part1.NotNullOrEmpty(nameof(part1));
         return GetFileParts(new FileInfo(part1)).Select(a => a.FullName);
     }
 
+    /// <summary>
+    /// From a passed in archive (zip, rar, 7z, 001), return all parts.
+    /// </summary>
+    /// <param name="part1"></param>
+    /// <returns></returns>
     public static IEnumerable<FileInfo> GetFileParts(FileInfo part1)
     {
         part1.NotNull(nameof(part1));
@@ -336,7 +411,7 @@ public static class ArchiveFactory
             if (part != null)
             {
                 yield return part;
-                while ((part = factory.GetFilePart(i++, part1)) != null)
+                while ((part = factory.GetFilePart(i++, part1)) != null) //tests split too
                 {
                     yield return part;
                 }

src/SharpCompress/Archives/AutoArchiveFactory.cs

@@ -31,22 +31,21 @@ internal class AutoArchiveFactory : IArchiveFactory
 
     public FileInfo? GetFilePart(int index, FileInfo part1) => throw new NotSupportedException();
 
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        ArchiveFactory.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        ArchiveFactory.Open(stream, readerOptions);
 
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public async ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await ArchiveFactory.OpenAsync(stream, readerOptions, cancellationToken);
 
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        ArchiveFactory.OpenArchive(fileInfo, readerOptions);
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        ArchiveFactory.Open(fileInfo, readerOptions);
 
-    public IAsyncArchive OpenAsyncArchive(
+    public async ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => await ArchiveFactory.OpenAsync(fileInfo, readerOptions, cancellationToken);
 }

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

@@ -1,197 +0,0 @@
-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.GZip;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-using SharpCompress.Readers.GZip;
-using SharpCompress.Writers;
-using SharpCompress.Writers.GZip;
-
-namespace SharpCompress.Archives.GZip;
-
-public partial class GZipArchive
-#if NET8_0_OR_GREATER
-    : IWritableArchiveOpenable,
-        IMultiArchiveOpenable<IWritableArchive, IWritableAsyncArchive>
-#endif
-{
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        path.NotNullOrEmpty(nameof(path));
-        return (IWritableAsyncArchive)OpenArchive(
-            new FileInfo(path),
-            readerOptions ?? new ReaderOptions()
-        );
-    }
-
-    public static IWritableArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
-    {
-        filePath.NotNullOrEmpty(nameof(filePath));
-        return OpenArchive(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
-    }
-
-    public static IWritableArchive OpenArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfo.NotNull(nameof(fileInfo));
-        return new GZipArchive(
-            new SourceStream(
-                fileInfo,
-                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfos.NotNull(nameof(fileInfos));
-        var files = fileInfos.ToArray();
-        return new GZipArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        streams.NotNull(nameof(streams));
-        var strms = streams.ToArray();
-        return new GZipArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        stream.NotNull(nameof(stream));
-
-        if (stream is not { CanSeek: true })
-        {
-            throw new ArgumentException("Stream must be seekable", nameof(stream));
-        }
-
-        return new GZipArchive(
-            new SourceStream(stream, _ => null, readerOptions ?? new ReaderOptions())
-        );
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(stream, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(streams, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
-
-    public static IWritableArchive CreateArchive() => new GZipArchive();
-
-    public static IWritableAsyncArchive CreateAsyncArchive() => new GZipArchive();
-
-    public static bool IsGZipFile(string filePath) => IsGZipFile(new FileInfo(filePath));
-
-    public static bool IsGZipFile(FileInfo fileInfo)
-    {
-        if (!fileInfo.Exists)
-        {
-            return false;
-        }
-
-        using Stream stream = fileInfo.OpenRead();
-        return IsGZipFile(stream);
-    }
-
-    public static bool IsGZipFile(Stream stream)
-    {
-        Span<byte> header = stackalloc byte[10];
-
-        if (!stream.ReadFully(header))
-        {
-            return false;
-        }
-
-        if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
-        {
-            return false;
-        }
-
-        return true;
-    }
-
-    public static async ValueTask<bool> IsGZipFileAsync(
-        Stream stream,
-        CancellationToken cancellationToken = default
-    )
-    {
-        byte[] header = new byte[10];
-
-        if (!await stream.ReadFullyAsync(header, cancellationToken).ConfigureAwait(false))
-        {
-            return false;
-        }
-
-        if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
-        {
-            return false;
-        }
-
-        return true;
-    }
-}

src/SharpCompress/Archives/GZip/GZipArchive.cs

@@ -14,20 +14,186 @@ using SharpCompress.Writers.GZip;
 
 namespace SharpCompress.Archives.GZip;
 
-public partial class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
+public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
 {
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    public static GZipArchive Open(string filePath, ReaderOptions? readerOptions = null)
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
+    }
+
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    public static GZipArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        return new GZipArchive(
+            new SourceStream(
+                fileInfo,
+                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    public static GZipArchive Open(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        return new GZipArchive(
+            new SourceStream(
+                files[0],
+                i => i < files.Length ? files[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    public static GZipArchive Open(IEnumerable<Stream> streams, ReaderOptions? readerOptions = null)
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        return new GZipArchive(
+            new SourceStream(
+                strms[0],
+                i => i < strms.Length ? strms[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    public static GZipArchive Open(Stream stream, ReaderOptions? readerOptions = null)
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        return new GZipArchive(
+            new SourceStream(stream, _ => null, readerOptions ?? new ReaderOptions())
+        );
+    }
+
+    /// <summary>
+    /// Opens a GZipArchive asynchronously from a stream.
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a GZipArchive asynchronously from a FileInfo.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfo, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a GZipArchive asynchronously from multiple streams.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(streams, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a GZipArchive asynchronously from multiple FileInfo objects.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfos, readerOptions));
+    }
+
+    public static GZipArchive Create() => new();
+
+    /// <summary>
+    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    /// </summary>
+    /// <param name="sourceStream"></param>
     private GZipArchive(SourceStream sourceStream)
         : base(ArchiveType.GZip, sourceStream) { }
 
-    internal GZipArchive()
-        : base(ArchiveType.GZip) { }
-
     protected override IEnumerable<GZipVolume> LoadVolumes(SourceStream sourceStream)
     {
         sourceStream.LoadAllParts();
         return sourceStream.Streams.Select(a => new GZipVolume(a, ReaderOptions, 0));
     }
 
+    public static bool IsGZipFile(string filePath) => IsGZipFile(new FileInfo(filePath));
+
+    public static bool IsGZipFile(FileInfo fileInfo)
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+
+        using Stream stream = fileInfo.OpenRead();
+        return IsGZipFile(stream);
+    }
+
     public void SaveTo(string filePath) => SaveTo(new FileInfo(filePath));
 
     public void SaveTo(FileInfo fileInfo)
@@ -49,6 +215,50 @@ public partial class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZi
             .ConfigureAwait(false);
     }
 
+    public static bool IsGZipFile(Stream stream)
+    {
+        // read the header on the first read
+        Span<byte> header = stackalloc byte[10];
+
+        // workitem 8501: handle edge case (decompress empty stream)
+        if (!stream.ReadFully(header))
+        {
+            return false;
+        }
+
+        if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
+        {
+            return false;
+        }
+
+        return true;
+    }
+
+    public static async ValueTask<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) { }
+
     protected override GZipArchiveEntry CreateEntryInternal(
         string filePath,
         Stream source,
@@ -119,18 +329,7 @@ public partial class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZi
         var stream = volumes.Single().Stream;
         yield return new GZipArchiveEntry(
             this,
-            GZipFilePart.Create(stream, ReaderOptions.ArchiveEncoding)
-        );
-    }
-
-    protected override async IAsyncEnumerable<GZipArchiveEntry> LoadEntriesAsync(
-        IAsyncEnumerable<GZipVolume> volumes
-    )
-    {
-        var stream = (await volumes.SingleAsync()).Stream;
-        yield return new GZipArchiveEntry(
-            this,
-            await GZipFilePart.CreateAsync(stream, ReaderOptions.ArchiveEncoding)
+            new GZipFilePart(stream, ReaderOptions.ArchiveEncoding)
         );
     }
 
@@ -138,13 +337,13 @@ public partial class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZi
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return GZipReader.OpenReader(stream);
+        return GZipReader.Open(stream);
     }
 
     protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return new((IAsyncReader)GZipReader.OpenReader(stream));
+        return new(GZipReader.Open(stream));
     }
 }

src/SharpCompress/Archives/GZip/GZipArchiveEntry.cs

@@ -23,10 +23,12 @@ public class GZipArchiveEntry : GZipEntry, IArchiveEntry
         return Parts.Single().GetCompressedStream().NotNull();
     }
 
-    public ValueTask<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default)
+    public async ValueTask<Stream> OpenEntryStreamAsync(
+        CancellationToken cancellationToken = default
+    )
     {
         // GZip synchronous implementation is fast enough, just wrap it
-        return new(OpenEntryStream());
+        return OpenEntryStream();
     }
 
     #region IArchiveEntry Members

src/SharpCompress/Archives/IArchive.cs

@@ -38,18 +38,5 @@ public interface IArchive : IDisposable
     /// <summary>
     /// The total size of the files as uncompressed in the archive.
     /// </summary>
-    long TotalUncompressedSize { get; }
-
-    /// <summary>
-    /// Returns whether the archive is encrypted.
-    /// </summary>
-    bool IsEncrypted { get; }
-
-    /// <summary>
-    /// Returns whether multi-threaded extraction is supported for this archive.
-    /// Multi-threading is supported when the archive is opened from a FileInfo or file path
-    /// (not a stream) and the format supports random access (e.g., Zip, Tar, Rar).
-    /// SOLID archives (some Rar, all 7Zip) should use sequential extraction for best performance.
-    /// </summary>
-    bool SupportsMultiThreadedExtraction { get; }
+    long TotalUncompressSize { get; }
 }

src/SharpCompress/Archives/IArchiveExtensions.cs

@@ -8,6 +8,7 @@ namespace SharpCompress.Archives;
 
 public static class IArchiveExtensions
 {
+    /// <param name="archive">The archive to extract.</param>
     extension(IArchive archive)
     {
         /// <summary>
@@ -22,6 +23,7 @@ public static class IArchiveExtensions
             IProgress<ProgressReport>? progress = null
         )
         {
+            // For solid archives (Rar, 7Zip), use the optimized reader-based approach
             if (archive.IsSolid || archive.Type == ArchiveType.SevenZip)
             {
                 using var reader = archive.ExtractAllEntries();
@@ -29,6 +31,7 @@ public static class IArchiveExtensions
             }
             else
             {
+                // For non-solid archives, extract entries directly
                 archive.WriteToDirectoryInternal(destinationDirectory, options, progress);
             }
         }
@@ -39,10 +42,14 @@ public static class IArchiveExtensions
             IProgress<ProgressReport>? progress
         )
         {
-            var totalBytes = archive.TotalUncompressedSize;
+            // Prepare for progress reporting
+            var totalBytes = archive.TotalUncompressSize;
             var bytesRead = 0L;
+
+            // Tracking for created directories.
             var seenDirectories = new HashSet<string>();
 
+            // Extract
             foreach (var entry in archive.Entries)
             {
                 if (entry.IsDirectory)
@@ -61,8 +68,10 @@ public static class IArchiveExtensions
                     continue;
                 }
 
+                // Use the entry's WriteToDirectory method which respects ExtractionOptions
                 entry.WriteToDirectory(destinationDirectory, options);
 
+                // Update progress
                 bytesRead += entry.Size;
                 progress?.Report(
                     new ProgressReport(entry.Key ?? string.Empty, bytesRead, totalBytes)

src/SharpCompress/Archives/IArchiveFactory.cs

@@ -1,5 +1,6 @@
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Factories;
 using SharpCompress.Readers;
 
@@ -25,21 +26,26 @@ public interface IArchiveFactory : IFactory
     /// </summary>
     /// <param name="stream">An open, readable and seekable stream.</param>
     /// <param name="readerOptions">reading options.</param>
-    IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null);
+    IArchive Open(Stream stream, ReaderOptions? readerOptions = null);
 
     /// <summary>
     /// Opens an Archive for random access asynchronously.
     /// </summary>
     /// <param name="stream">An open, readable and seekable stream.</param>
     /// <param name="readerOptions">reading options.</param>
-    IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null);
+    /// <param name="cancellationToken">Cancellation token.</param>
+    ValueTask<IAsyncArchive> 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 OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null);
+    IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null);
 
     /// <summary>
     /// Opens an Archive from a FileInfo object asynchronously.
@@ -47,7 +53,7 @@ public interface IArchiveFactory : IFactory
     /// <param name="fileInfo">the file to open.</param>
     /// <param name="readerOptions">reading options.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
-    IAsyncArchive OpenAsyncArchive(
+    ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default

src/SharpCompress/Archives/IArchiveOpenable.cs

@@ -1,40 +0,0 @@
-#if NET8_0_OR_GREATER
-using System.IO;
-using System.Threading;
-using SharpCompress.Readers;
-
-namespace SharpCompress.Archives;
-
-public interface IArchiveOpenable<TSync, TASync>
-    where TSync : IArchive
-    where TASync : IAsyncArchive
-{
-    public static abstract TSync OpenArchive(string filePath, ReaderOptions? readerOptions = null);
-
-    public static abstract TSync OpenArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    );
-
-    public static abstract TSync OpenArchive(Stream stream, ReaderOptions? readerOptions = null);
-
-    public static abstract TASync OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    );
-
-    public static abstract TASync OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    );
-
-    public static abstract TASync OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    );
-}
-
-#endif

src/SharpCompress/Archives/IAsyncArchive.cs

@@ -39,10 +39,5 @@ public interface IAsyncArchive : IAsyncDisposable
     /// <summary>
     /// The total size of the files as uncompressed in the archive.
     /// </summary>
-    ValueTask<long> TotalUncompressedSizeAsync();
-
-    /// <summary>
-    /// Returns whether the archive is encrypted.
-    /// </summary>
-    ValueTask<bool> IsEncryptedAsync();
+    ValueTask<long> TotalUncompressSizeAsync();
 }

src/SharpCompress/Archives/IAsyncArchiveExtensions.cs

@@ -10,83 +10,84 @@ namespace SharpCompress.Archives;
 
 public static class IAsyncArchiveExtensions
 {
-    extension(IAsyncArchive archive)
+    /// <summary>
+    /// Extract to specific directory asynchronously with progress reporting and cancellation support
+    /// </summary>
+    /// <param name="archive">The archive to extract.</param>
+    /// <param name="destinationDirectory">The folder to extract into.</param>
+    /// <param name="options">Extraction options.</param>
+    /// <param name="progress">Optional progress reporter for tracking extraction progress.</param>
+    /// <param name="cancellationToken">Optional cancellation token.</param>
+    public static async Task WriteToDirectoryAsync(
+        this IAsyncArchive archive,
+        string destinationDirectory,
+        ExtractionOptions? options = null,
+        IProgress<ProgressReport>? progress = null,
+        CancellationToken cancellationToken = default
+    )
     {
-        /// <summary>
-        /// Extract to specific directory asynchronously with progress reporting and cancellation support
-        /// </summary>
-        /// <param name="archive">The archive to extract.</param>
-        /// <param name="destinationDirectory">The folder to extract into.</param>
-        /// <param name="options">Extraction options.</param>
-        /// <param name="progress">Optional progress reporter for tracking extraction progress.</param>
-        /// <param name="cancellationToken">Optional cancellation token.</param>
-        public async Task WriteToDirectoryAsync(
-            string destinationDirectory,
-            ExtractionOptions? options = null,
-            IProgress<ProgressReport>? progress = null,
-            CancellationToken cancellationToken = default
-        )
+        // For solid archives (Rar, 7Zip), use the optimized reader-based approach
+        if (await archive.IsSolidAsync() || archive.Type == ArchiveType.SevenZip)
         {
-            if (await archive.IsSolidAsync() || archive.Type == ArchiveType.SevenZip)
-            {
-                await using var reader = await archive.ExtractAllEntriesAsync();
-                await reader.WriteAllToDirectoryAsync(
-                    destinationDirectory,
-                    options,
-                    cancellationToken
-                );
-            }
-            else
-            {
-                await archive.WriteToDirectoryAsyncInternal(
-                    destinationDirectory,
-                    options,
-                    progress,
-                    cancellationToken
-                );
-            }
+            await using var reader = await archive.ExtractAllEntriesAsync();
+            await reader.WriteAllToDirectoryAsync(destinationDirectory, options, cancellationToken);
         }
-
-        private async Task WriteToDirectoryAsyncInternal(
-            string destinationDirectory,
-            ExtractionOptions? options,
-            IProgress<ProgressReport>? progress,
-            CancellationToken cancellationToken
-        )
+        else
         {
-            var totalBytes = await archive.TotalUncompressedSizeAsync();
-            var bytesRead = 0L;
-            var seenDirectories = new HashSet<string>();
+            // For non-solid archives, extract entries directly
+            await archive.WriteToDirectoryAsyncInternal(
+                destinationDirectory,
+                options,
+                progress,
+                cancellationToken
+            );
+        }
+    }
 
-            await foreach (var entry in archive.EntriesAsync.WithCancellation(cancellationToken))
+    private static async Task WriteToDirectoryAsyncInternal(
+        this IAsyncArchive archive,
+        string destinationDirectory,
+        ExtractionOptions? options,
+        IProgress<ProgressReport>? progress,
+        CancellationToken cancellationToken
+    )
+    {
+        // Prepare for progress reporting
+        var totalBytes = await archive.TotalUncompressSizeAsync();
+        var bytesRead = 0L;
+
+        // Tracking for created directories.
+        var seenDirectories = new HashSet<string>();
+
+        // Extract
+        await foreach (var entry in archive.EntriesAsync.WithCancellation(cancellationToken))
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+
+            if (entry.IsDirectory)
             {
-                cancellationToken.ThrowIfCancellationRequested();
-
-                if (entry.IsDirectory)
-                {
-                    var dirPath = Path.Combine(
-                        destinationDirectory,
-                        entry.Key.NotNull("Entry Key is null")
-                    );
-                    if (
-                        Path.GetDirectoryName(dirPath + "/") is { } parentDirectory
-                        && seenDirectories.Add(dirPath)
-                    )
-                    {
-                        Directory.CreateDirectory(parentDirectory);
-                    }
-                    continue;
-                }
-
-                await entry
-                    .WriteToDirectoryAsync(destinationDirectory, options, cancellationToken)
-                    .ConfigureAwait(false);
-
-                bytesRead += entry.Size;
-                progress?.Report(
-                    new ProgressReport(entry.Key ?? string.Empty, bytesRead, totalBytes)
+                var dirPath = Path.Combine(
+                    destinationDirectory,
+                    entry.Key.NotNull("Entry Key is null")
                 );
+                if (
+                    Path.GetDirectoryName(dirPath + "/") is { } parentDirectory
+                    && seenDirectories.Add(dirPath)
+                )
+                {
+                    Directory.CreateDirectory(parentDirectory);
+                }
+                continue;
             }
+
+            // Use the entry's WriteToDirectoryAsync method which respects ExtractionOptions
+            await entry
+                .WriteToDirectoryAsync(destinationDirectory, options, cancellationToken)
+                .ConfigureAwait(false);
+
+            // Update progress
+            bytesRead += entry.Size;
+            progress?.Report(new ProgressReport(entry.Key ?? string.Empty, bytesRead, totalBytes));
         }
     }
 }

src/SharpCompress/Archives/IMultiArchiveFactory.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Factories;
 using SharpCompress.Readers;
 
@@ -26,16 +27,18 @@ public interface IMultiArchiveFactory : IFactory
     /// </summary>
     /// <param name="streams"></param>
     /// <param name="readerOptions">reading options.</param>
-    IArchive OpenArchive(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null);
+    IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null);
 
     /// <summary>
     /// Opens a multi-part archive from streams asynchronously.
     /// </summary>
     /// <param name="streams"></param>
     /// <param name="readerOptions">reading options.</param>
-    IAsyncArchive OpenAsyncArchive(
+    /// <param name="cancellationToken">Cancellation token.</param>
+    ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
     );
 
     /// <summary>
@@ -43,7 +46,7 @@ public interface IMultiArchiveFactory : IFactory
     /// </summary>
     /// <param name="fileInfos"></param>
     /// <param name="readerOptions">reading options.</param>
-    IArchive OpenArchive(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null);
+    IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null);
 
     /// <summary>
     /// Opens a multi-part archive from files asynchronously.
@@ -51,7 +54,7 @@ public interface IMultiArchiveFactory : IFactory
     /// <param name="fileInfos"></param>
     /// <param name="readerOptions">reading options.</param>
     /// <param name="cancellationToken">Cancellation token.</param>
-    IAsyncArchive OpenAsyncArchive(
+    ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default

src/SharpCompress/Archives/IMultiArchiveOpenable.cs

@@ -1,35 +0,0 @@
-#if NET8_0_OR_GREATER
-using System.Collections.Generic;
-using System.IO;
-using System.Threading;
-using SharpCompress.Readers;
-
-namespace SharpCompress.Archives;
-
-public interface IMultiArchiveOpenable<TSync, TASync>
-    where TSync : IArchive
-    where TASync : IAsyncArchive
-{
-    public static abstract TSync OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    );
-
-    public static abstract TSync OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    );
-
-    public static abstract TASync OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    );
-
-    public static abstract TASync OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    );
-}
-#endif

src/SharpCompress/Archives/IWritableArchive.cs

@@ -6,17 +6,8 @@ using SharpCompress.Writers;
 
 namespace SharpCompress.Archives;
 
-public interface IWritableArchiveCommon
+public interface IWritableArchive : IArchive
 {
-    /// <summary>
-    /// Use this to pause entry rebuilding when adding large collections of entries.  Dispose when complete.  A  using statement is recommended.
-    /// </summary>
-    /// <returns>IDisposeable to resume entry rebuilding</returns>
-    IDisposable PauseEntryRebuilding();
-
-    /// <summary>
-    /// Removes the specified entry from the archive.
-    /// </summary>
     void RemoveEntry(IArchiveEntry entry);
 
     IArchiveEntry AddEntry(
@@ -28,24 +19,18 @@ public interface IWritableArchiveCommon
     );
 
     IArchiveEntry AddDirectoryEntry(string key, DateTime? modified = null);
-}
 
-public interface IWritableArchive : IArchive, IWritableArchiveCommon
-{
-    /// <summary>
-    /// Saves the archive to the specified stream using the given writer options.
-    /// </summary>
     void SaveTo(Stream stream, WriterOptions options);
-}
 
-public interface IWritableAsyncArchive : IAsyncArchive, IWritableArchiveCommon
-{
-    /// <summary>
-    /// Asynchronously saves the archive to the specified stream using the given writer options.
-    /// </summary>
     ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         CancellationToken cancellationToken = default
     );
+
+    /// <summary>
+    /// Use this to pause entry rebuilding when adding large collections of entries.  Dispose when complete.  A  using statement is recommended.
+    /// </summary>
+    /// <returns>IDisposeable to resume entry rebuilding</returns>
+    IDisposable PauseEntryRebuilding();
 }

src/SharpCompress/Archives/IWritableArchiveCommonExtensions.cs

@@ -1,59 +0,0 @@
-using System;
-using System.IO;
-
-namespace SharpCompress.Archives;
-
-public static class IWritableArchiveCommonExtensions
-{
-    extension(IWritableArchiveCommon writableArchive)
-    {
-        public void AddAllFromDirectory(
-            string filePath,
-            string searchPattern = "*.*",
-            SearchOption searchOption = SearchOption.AllDirectories
-        )
-        {
-            using (writableArchive.PauseEntryRebuilding())
-            {
-                foreach (
-                    var path in Directory.EnumerateFiles(filePath, searchPattern, searchOption)
-                )
-                {
-                    var fileInfo = new FileInfo(path);
-                    writableArchive.AddEntry(
-                        path.Substring(filePath.Length),
-                        fileInfo.OpenRead(),
-                        true,
-                        fileInfo.Length,
-                        fileInfo.LastWriteTime
-                    );
-                }
-            }
-        }
-
-        public IArchiveEntry AddEntry(string key, string file) =>
-            writableArchive.AddEntry(key, new FileInfo(file));
-
-        public IArchiveEntry AddEntry(
-            string key,
-            Stream source,
-            long size = 0,
-            DateTime? modified = null
-        ) => writableArchive.AddEntry(key, source, false, size, modified);
-
-        public IArchiveEntry AddEntry(string key, FileInfo fileInfo)
-        {
-            if (!fileInfo.Exists)
-            {
-                throw new ArgumentException("FileInfo does not exist.");
-            }
-            return writableArchive.AddEntry(
-                key,
-                fileInfo.OpenRead(),
-                true,
-                fileInfo.Length,
-                fileInfo.LastWriteTime
-            );
-        }
-    }
-}

src/SharpCompress/Archives/IWritableArchiveExtensions.cs

@@ -1,20 +1,106 @@
+using System;
 using System.IO;
-using SharpCompress.Common;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Writers;
 
 namespace SharpCompress.Archives;
 
 public static class IWritableArchiveExtensions
 {
-    extension(IWritableArchive writableArchive)
+    public static void AddEntry(
+        this IWritableArchive writableArchive,
+        string entryPath,
+        string filePath
+    )
     {
-        public void SaveTo(string filePath, WriterOptions? options = null) =>
-            writableArchive.SaveTo(new FileInfo(filePath), options ?? new(CompressionType.Deflate));
-
-        public void SaveTo(FileInfo fileInfo, WriterOptions? options = null)
+        var fileInfo = new FileInfo(filePath);
+        if (!fileInfo.Exists)
         {
-            using var stream = fileInfo.Open(FileMode.Create, FileAccess.Write);
-            writableArchive.SaveTo(stream, options ?? new(CompressionType.Deflate));
+            throw new FileNotFoundException("Could not AddEntry: " + filePath);
+        }
+        writableArchive.AddEntry(
+            entryPath,
+            new FileInfo(filePath).OpenRead(),
+            true,
+            fileInfo.Length,
+            fileInfo.LastWriteTime
+        );
+    }
+
+    public static void SaveTo(
+        this IWritableArchive writableArchive,
+        string filePath,
+        WriterOptions options
+    ) => writableArchive.SaveTo(new FileInfo(filePath), options);
+
+    public static void SaveTo(
+        this IWritableArchive writableArchive,
+        FileInfo fileInfo,
+        WriterOptions options
+    )
+    {
+        using var stream = fileInfo.Open(FileMode.Create, FileAccess.Write);
+        writableArchive.SaveTo(stream, options);
+    }
+
+    public static ValueTask SaveToAsync(
+        this IWritableArchive writableArchive,
+        string filePath,
+        WriterOptions options,
+        CancellationToken cancellationToken = default
+    ) => writableArchive.SaveToAsync(new FileInfo(filePath), options, cancellationToken);
+
+    public static async ValueTask SaveToAsync(
+        this IWritableArchive writableArchive,
+        FileInfo fileInfo,
+        WriterOptions options,
+        CancellationToken cancellationToken = default
+    )
+    {
+        using var stream = fileInfo.Open(FileMode.Create, FileAccess.Write);
+        await writableArchive.SaveToAsync(stream, options, cancellationToken).ConfigureAwait(false);
+    }
+
+    public static void AddAllFromDirectory(
+        this IWritableArchive writableArchive,
+        string filePath,
+        string searchPattern = "*.*",
+        SearchOption searchOption = SearchOption.AllDirectories
+    )
+    {
+        using (writableArchive.PauseEntryRebuilding())
+        {
+            foreach (var path in Directory.EnumerateFiles(filePath, searchPattern, searchOption))
+            {
+                var fileInfo = new FileInfo(path);
+                writableArchive.AddEntry(
+                    path.Substring(filePath.Length),
+                    fileInfo.OpenRead(),
+                    true,
+                    fileInfo.Length,
+                    fileInfo.LastWriteTime
+                );
+            }
         }
     }
+
+    public static IArchiveEntry AddEntry(
+        this IWritableArchive writableArchive,
+        string key,
+        FileInfo fileInfo
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            throw new ArgumentException("FileInfo does not exist.");
+        }
+        return writableArchive.AddEntry(
+            key,
+            fileInfo.OpenRead(),
+            true,
+            fileInfo.Length,
+            fileInfo.LastWriteTime
+        );
+    }
 }

src/SharpCompress/Archives/IWritableArchiveOpenable.cs

@@ -1,10 +0,0 @@
-#if NET8_0_OR_GREATER
-namespace SharpCompress.Archives;
-
-public interface IWritableArchiveOpenable
-    : IArchiveOpenable<IWritableArchive, IWritableAsyncArchive>
-{
-    public static abstract IWritableArchive CreateArchive();
-    public static abstract IWritableAsyncArchive CreateAsyncArchive();
-}
-#endif

src/SharpCompress/Archives/IWritableAsyncArchiveExtensions.cs

@@ -1,36 +0,0 @@
-using System.IO;
-using System.Threading;
-using System.Threading.Tasks;
-using SharpCompress.Common;
-using SharpCompress.Writers;
-
-namespace SharpCompress.Archives;
-
-public static class IWritableAsyncArchiveExtensions
-{
-    extension(IWritableAsyncArchive writableArchive)
-    {
-        public ValueTask SaveToAsync(
-            string filePath,
-            WriterOptions? options = null,
-            CancellationToken cancellationToken = default
-        ) =>
-            writableArchive.SaveToAsync(
-                new FileInfo(filePath),
-                options ?? new(CompressionType.Deflate),
-                cancellationToken
-            );
-
-        public async ValueTask SaveToAsync(
-            FileInfo fileInfo,
-            WriterOptions? options = null,
-            CancellationToken cancellationToken = default
-        )
-        {
-            using var stream = fileInfo.Open(FileMode.Create, FileAccess.Write);
-            await writableArchive
-                .SaveToAsync(stream, options ?? new(CompressionType.Deflate), cancellationToken)
-                .ConfigureAwait(false);
-        }
-    }
-}

src/SharpCompress/Archives/IWriteableArchiveFactory.cs

@@ -16,5 +16,5 @@ public interface IWriteableArchiveFactory : Factories.IFactory
     /// Creates a new, empty archive, ready to be written.
     /// </summary>
     /// <returns></returns>
-    IWritableArchive CreateArchive();
+    IWritableArchive CreateWriteableArchive();
 }

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

@@ -1,36 +1,18 @@
-using System.Linq;
-using System.Threading.Tasks;
-using SharpCompress.Common.Rar;
+using System.Linq;
 
 namespace SharpCompress.Archives.Rar;
 
 public static class RarArchiveExtensions
 {
-    extension(IRarArchive archive)
-    {
-        /// <summary>
-        /// RarArchive is the first volume of a multi-part archive.  If MultipartVolume is true and IsFirstVolume is false then the first volume file must be missing.
-        /// </summary>
-        public bool IsFirstVolume() => archive.Volumes.Cast<RarVolume>().First().IsFirstVolume;
+    /// <summary>
+    /// RarArchive is the first volume of a multi-part archive.  If MultipartVolume is true and IsFirstVolume is false then the first volume file must be missing.
+    /// </summary>
+    public static bool IsFirstVolume(this RarArchive archive) =>
+        archive.Volumes.First().IsFirstVolume;
 
-        /// <summary>
-        /// RarArchive is part of a multi-part archive.
-        /// </summary>
-        public bool IsMultipartVolume() => archive.Volumes.Cast<RarVolume>().First().IsMultiVolume;
-    }
-
-    extension(IRarAsyncArchive archive)
-    {
-        /// <summary>
-        /// RarArchive is the first volume of a multi-part archive.  If MultipartVolume is true and IsFirstVolume is false then the first volume file must be missing.
-        /// </summary>
-        public async ValueTask<bool> IsFirstVolumeAsync() =>
-            (await archive.VolumesAsync.CastAsync<RarVolume>().FirstAsync()).IsFirstVolume;
-
-        /// <summary>
-        /// RarArchive is part of a multi-part archive.
-        /// </summary>
-        public async ValueTask<bool> IsMultipartVolumeAsync() =>
-            (await archive.VolumesAsync.CastAsync<RarVolume>().FirstAsync()).IsMultiVolume;
-    }
+    /// <summary>
+    /// RarArchive is part of a multi-part archive.
+    /// </summary>
+    public static bool IsMultipartVolume(this RarArchive archive) =>
+        archive.Volumes.First().IsMultiVolume;
 }

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

@@ -1,166 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Threading;
-using SharpCompress.Common;
-using SharpCompress.Common.Rar;
-using SharpCompress.Common.Rar.Headers;
-using SharpCompress.Compressors.Rar;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-using SharpCompress.Readers.Rar;
-
-namespace SharpCompress.Archives.Rar;
-
-public partial class RarArchive
-#if NET8_0_OR_GREATER
-    : IArchiveOpenable<IRarArchive, IRarAsyncArchive>,
-        IMultiArchiveOpenable<IRarArchive, IRarAsyncArchive>
-#endif
-{
-    public static IRarAsyncArchive OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        path.NotNullOrEmpty(nameof(path));
-        return (IRarAsyncArchive)OpenArchive(new FileInfo(path), readerOptions);
-    }
-
-    public static IRarArchive OpenArchive(string filePath, ReaderOptions? options = null)
-    {
-        filePath.NotNullOrEmpty(nameof(filePath));
-        var fileInfo = new FileInfo(filePath);
-        return new RarArchive(
-            new SourceStream(
-                fileInfo,
-                i => RarArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                options ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IRarArchive OpenArchive(FileInfo fileInfo, ReaderOptions? options = null)
-    {
-        fileInfo.NotNull(nameof(fileInfo));
-        return new RarArchive(
-            new SourceStream(
-                fileInfo,
-                i => RarArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                options ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IRarArchive OpenArchive(Stream stream, ReaderOptions? options = null)
-    {
-        stream.NotNull(nameof(stream));
-
-        if (stream is not { CanSeek: true })
-        {
-            throw new ArgumentException("Stream must be seekable", nameof(stream));
-        }
-
-        return new RarArchive(new SourceStream(stream, _ => null, options ?? new ReaderOptions()));
-    }
-
-    public static IRarArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfos.NotNull(nameof(fileInfos));
-        var files = fileInfos.ToArray();
-        return new RarArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IRarArchive OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        streams.NotNull(nameof(streams));
-        var strms = streams.ToArray();
-        return new RarArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IRarAsyncArchive OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IRarAsyncArchive)OpenArchive(stream, readerOptions);
-    }
-
-    public static IRarAsyncArchive OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IRarAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
-
-    public static IRarAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IRarAsyncArchive)OpenArchive(streams, readerOptions);
-    }
-
-    public static IRarAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IRarAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
-
-    public static bool IsRarFile(string filePath) => IsRarFile(new FileInfo(filePath));
-
-    public static bool IsRarFile(FileInfo fileInfo)
-    {
-        if (!fileInfo.Exists)
-        {
-            return false;
-        }
-        using Stream stream = fileInfo.OpenRead();
-        return IsRarFile(stream);
-    }
-
-    public static bool IsRarFile(Stream stream, ReaderOptions? options = null)
-    {
-        try
-        {
-            MarkHeader.Read(stream, true, false);
-            return true;
-        }
-        catch
-        {
-            return false;
-        }
-    }
-}

src/SharpCompress/Archives/Rar/RarArchive.cs

@@ -14,23 +14,17 @@ using SharpCompress.Readers.Rar;
 
 namespace SharpCompress.Archives.Rar;
 
-public interface IRarArchiveCommon
-{
-    int MinVersion { get; }
-    int MaxVersion { get; }
-}
-
-public interface IRarArchive : IArchive, IRarArchiveCommon { }
-
-public interface IRarAsyncArchive : IAsyncArchive, IRarArchiveCommon { }
-
-public partial class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>, IRarArchive
+public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
 {
     private bool _disposed;
     internal Lazy<IRarUnpack> UnpackV2017 { get; } =
         new(() => new Compressors.Rar.UnpackV2017.Unpack());
     internal Lazy<IRarUnpack> UnpackV1 { get; } = new(() => new Compressors.Rar.UnpackV1.Unpack());
 
+    /// <summary>
+    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    /// </summary>
+    /// <param name="sourceStream"></param>
     private RarArchive(SourceStream sourceStream)
         : base(ArchiveType.Rar, sourceStream) { }
 
@@ -48,29 +42,15 @@ public partial class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>, I
         }
     }
 
-    public override async ValueTask DisposeAsync()
-    {
-        if (!_disposed)
-        {
-            if (UnpackV1.IsValueCreated && UnpackV1.Value is IDisposable unpackV1)
-            {
-                unpackV1.Dispose();
-            }
-
-            _disposed = true;
-            await base.DisposeAsync();
-        }
-    }
-
     protected override IEnumerable<RarArchiveEntry> LoadEntries(IEnumerable<RarVolume> volumes) =>
         RarArchiveEntryFactory.GetEntries(this, volumes, ReaderOptions);
 
     protected override IEnumerable<RarVolume> LoadVolumes(SourceStream sourceStream)
     {
-        sourceStream.LoadAllParts();
+        sourceStream.LoadAllParts(); //request all streams
         var streams = sourceStream.Streams.ToArray();
         var i = 0;
-        if (streams.Length > 1 && IsRarFile(streams[1], ReaderOptions))
+        if (streams.Length > 1 && IsRarFile(streams[1], ReaderOptions)) //test part 2 - true = multipart not split
         {
             sourceStream.IsVolumes = true;
             streams[1].Position = 0;
@@ -83,6 +63,7 @@ public partial class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>, I
             ));
         }
 
+        //split mode or single file
         return new StreamRarArchiveVolume(sourceStream, ReaderOptions, i++).AsEnumerable();
     }
 
@@ -101,12 +82,12 @@ public partial class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>, I
                 volume.Stream.Position = 0;
                 return volume.Stream;
             });
-            return (RarReader)RarReader.OpenReader(streams, ReaderOptions);
+            return RarReader.Open(streams, ReaderOptions);
         }
 
         var stream = Volumes.First().Stream;
         stream.Position = 0;
-        return (RarReader)RarReader.OpenReader(stream, ReaderOptions);
+        return RarReader.Open(stream, ReaderOptions);
     }
 
     public override bool IsSolid => Volumes.First().IsSolidArchive;
@@ -115,4 +96,187 @@ public partial class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>, I
 
     public virtual int MinVersion => Volumes.First().MinVersion;
     public virtual int MaxVersion => Volumes.First().MaxVersion;
+
+    #region Creation
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="options"></param>
+    public static RarArchive Open(string filePath, ReaderOptions? options = null)
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        var fileInfo = new FileInfo(filePath);
+        return new RarArchive(
+            new SourceStream(
+                fileInfo,
+                i => RarArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                options ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="options"></param>
+    public static RarArchive Open(FileInfo fileInfo, ReaderOptions? options = null)
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        return new RarArchive(
+            new SourceStream(
+                fileInfo,
+                i => RarArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                options ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="options"></param>
+    public static RarArchive Open(Stream stream, ReaderOptions? options = null)
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        return new RarArchive(new SourceStream(stream, _ => null, options ?? new ReaderOptions()));
+    }
+
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    public static RarArchive Open(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        return new RarArchive(
+            new SourceStream(
+                files[0],
+                i => i < files.Length ? files[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    public static RarArchive Open(IEnumerable<Stream> streams, ReaderOptions? readerOptions = null)
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        return new RarArchive(
+            new SourceStream(
+                strms[0],
+                i => i < strms.Length ? strms[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Opens a RarArchive asynchronously from a stream.
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a RarArchive asynchronously from a FileInfo.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfo, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a RarArchive asynchronously from multiple streams.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(streams, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a RarArchive asynchronously from multiple FileInfo objects.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfos, readerOptions));
+    }
+
+    public static bool IsRarFile(string filePath) => IsRarFile(new FileInfo(filePath));
+
+    public static bool IsRarFile(FileInfo fileInfo)
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return IsRarFile(stream);
+    }
+
+    public static bool IsRarFile(Stream stream, ReaderOptions? options = null)
+    {
+        try
+        {
+            MarkHeader.Read(stream, true, false);
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    #endregion
 }

src/SharpCompress/Archives/Rar/SeekableFilePart.cs

@@ -1,7 +1,6 @@
 using System.IO;
 using SharpCompress.Common.Rar;
 using SharpCompress.Common.Rar.Headers;
-using SharpCompress.IO;
 
 namespace SharpCompress.Archives.Rar;
 
@@ -25,76 +24,6 @@ internal class SeekableFilePart : RarFilePart
 
     internal override Stream GetCompressedStream()
     {
-        Stream streamToUse;
-
-        // If the stream is a SourceStream in file mode with multi-threading enabled,
-        // create an independent stream to support concurrent extraction
-        if (
-            _stream is SourceStream sourceStream
-            && sourceStream.IsFileMode
-            && sourceStream.ReaderOptions.EnableMultiThreadedExtraction
-        )
-        {
-            var independentStream = sourceStream.CreateIndependentStream(0);
-            if (independentStream is not null)
-            {
-                streamToUse = independentStream;
-                streamToUse.Position = FileHeader.DataStartPosition;
-
-                if (FileHeader.R4Salt != null)
-                {
-                    var cryptKey = new CryptKey3(_password!);
-                    return new RarCryptoWrapper(streamToUse, FileHeader.R4Salt, cryptKey);
-                }
-
-                if (FileHeader.Rar5CryptoInfo != null)
-                {
-                    var cryptKey = new CryptKey5(_password!, FileHeader.Rar5CryptoInfo);
-                    return new RarCryptoWrapper(
-                        streamToUse,
-                        FileHeader.Rar5CryptoInfo.Salt,
-                        cryptKey
-                    );
-                }
-
-                return streamToUse;
-            }
-        }
-
-        // Check if the stream wraps a FileStream
-        Stream? underlyingStream = _stream;
-        if (_stream is IStreamStack streamStack)
-        {
-            underlyingStream = streamStack.BaseStream();
-        }
-
-        if (underlyingStream is FileStream fileStream)
-        {
-            // Create a new independent stream from the file
-            streamToUse = new FileStream(
-                fileStream.Name,
-                FileMode.Open,
-                FileAccess.Read,
-                FileShare.Read
-            );
-            streamToUse.Position = FileHeader.DataStartPosition;
-
-            if (FileHeader.R4Salt != null)
-            {
-                var cryptKey = new CryptKey3(_password!);
-                return new RarCryptoWrapper(streamToUse, FileHeader.R4Salt, cryptKey);
-            }
-
-            if (FileHeader.Rar5CryptoInfo != null)
-            {
-                var cryptKey = new CryptKey5(_password!, FileHeader.Rar5CryptoInfo);
-                return new RarCryptoWrapper(streamToUse, FileHeader.Rar5CryptoInfo.Salt, cryptKey);
-            }
-
-            return streamToUse;
-        }
-
-        // Fall back to existing behavior for stream-based sources
         _stream.Position = FileHeader.DataStartPosition;
 
         if (FileHeader.R4Salt != null)

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

@@ -1,169 +0,0 @@
-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.SevenZip;
-using SharpCompress.Compressors.LZMA.Utilites;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-
-namespace SharpCompress.Archives.SevenZip;
-
-public partial class SevenZipArchive
-#if NET8_0_OR_GREATER
-    : IArchiveOpenable<IArchive, IAsyncArchive>,
-        IMultiArchiveOpenable<IArchive, IAsyncArchive>
-#endif
-{
-    public static IAsyncArchive OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        path.NotNullOrEmpty("path");
-        return (IAsyncArchive)OpenArchive(new FileInfo(path), readerOptions ?? new ReaderOptions());
-    }
-
-    public static IArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
-    {
-        filePath.NotNullOrEmpty("filePath");
-        return OpenArchive(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
-    }
-
-    public static IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null)
-    {
-        fileInfo.NotNull("fileInfo");
-        return new SevenZipArchive(
-            new SourceStream(
-                fileInfo,
-                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfos.NotNull(nameof(fileInfos));
-        var files = fileInfos.ToArray();
-        return new SevenZipArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IArchive OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        streams.NotNull(nameof(streams));
-        var strms = streams.ToArray();
-        return new SevenZipArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        stream.NotNull("stream");
-
-        if (stream is not { CanSeek: true })
-        {
-            throw new ArgumentException("Stream must be seekable", nameof(stream));
-        }
-
-        return new SevenZipArchive(
-            new SourceStream(stream, _ => null, readerOptions ?? new ReaderOptions())
-        );
-    }
-
-    public static IAsyncArchive OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(stream, readerOptions);
-    }
-
-    public static IAsyncArchive OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
-
-    public static IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(streams, readerOptions);
-    }
-
-    public static IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
-
-    public static bool IsSevenZipFile(string filePath) => IsSevenZipFile(new FileInfo(filePath));
-
-    public static bool IsSevenZipFile(FileInfo fileInfo)
-    {
-        if (!fileInfo.Exists)
-        {
-            return false;
-        }
-        using Stream stream = fileInfo.OpenRead();
-        return IsSevenZipFile(stream);
-    }
-
-    public static bool IsSevenZipFile(Stream stream)
-    {
-        try
-        {
-            return SignatureMatch(stream);
-        }
-        catch
-        {
-            return false;
-        }
-    }
-
-    private static ReadOnlySpan<byte> Signature =>
-        new byte[] { (byte)'7', (byte)'z', 0xBC, 0xAF, 0x27, 0x1C };
-
-    private static bool SignatureMatch(Stream stream)
-    {
-        var reader = new BinaryReader(stream);
-        ReadOnlySpan<byte> signatureBytes = reader.ReadBytes(6);
-        return signatureBytes.SequenceEqual(Signature);
-    }
-}

src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs

@@ -12,22 +12,191 @@ using SharpCompress.Readers;
 
 namespace SharpCompress.Archives.SevenZip;
 
-public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVolume>
+public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVolume>
 {
     private ArchiveDatabase? _database;
 
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    public static SevenZipArchive Open(string filePath, ReaderOptions? readerOptions = null)
+    {
+        filePath.NotNullOrEmpty("filePath");
+        return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
+    }
+
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    public static SevenZipArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
+    {
+        fileInfo.NotNull("fileInfo");
+        return new SevenZipArchive(
+            new SourceStream(
+                fileInfo,
+                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    public static SevenZipArchive Open(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        return new SevenZipArchive(
+            new SourceStream(
+                files[0],
+                i => i < files.Length ? files[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    public static SevenZipArchive Open(
+        IEnumerable<Stream> streams,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        return new SevenZipArchive(
+            new SourceStream(
+                strms[0],
+                i => i < strms.Length ? strms[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    public static SevenZipArchive Open(Stream stream, ReaderOptions? readerOptions = null)
+    {
+        stream.NotNull("stream");
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        return new SevenZipArchive(
+            new SourceStream(stream, _ => null, readerOptions ?? new ReaderOptions())
+        );
+    }
+
+    /// <summary>
+    /// Opens a SevenZipArchive asynchronously from a stream.
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a SevenZipArchive asynchronously from a FileInfo.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfo, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a SevenZipArchive asynchronously from multiple streams.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(streams, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a SevenZipArchive asynchronously from multiple FileInfo objects.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfos, readerOptions));
+    }
+
+    /// <summary>
+    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    /// </summary>
+    /// <param name="sourceStream"></param>
     private SevenZipArchive(SourceStream sourceStream)
         : base(ArchiveType.SevenZip, sourceStream) { }
 
-    internal SevenZipArchive()
-        : base(ArchiveType.SevenZip) { }
-
     protected override IEnumerable<SevenZipVolume> LoadVolumes(SourceStream sourceStream)
     {
-        sourceStream.NotNull("SourceStream is null").LoadAllParts();
-        return new SevenZipVolume(sourceStream, ReaderOptions, 0).AsEnumerable();
+        sourceStream.NotNull("SourceStream is null").LoadAllParts(); //request all streams
+        return new SevenZipVolume(sourceStream, ReaderOptions, 0).AsEnumerable(); //simple single volume or split, multivolume not supported
     }
 
+    public static bool IsSevenZipFile(string filePath) => IsSevenZipFile(new FileInfo(filePath));
+
+    public static bool IsSevenZipFile(FileInfo fileInfo)
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return IsSevenZipFile(stream);
+    }
+
+    internal SevenZipArchive()
+        : base(ArchiveType.SevenZip) { }
+
     protected override IEnumerable<SevenZipArchiveEntry> LoadEntries(
         IEnumerable<SevenZipVolume> volumes
     )
@@ -53,7 +222,7 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
             foreach (var entry in group)
             {
                 entry.IsSolid = isSolid;
-                isSolid = true;
+                isSolid = true; //mark others in this group as solid - same as rar behaviour.
             }
         }
 
@@ -71,6 +240,28 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
         }
     }
 
+    public static bool IsSevenZipFile(Stream stream)
+    {
+        try
+        {
+            return SignatureMatch(stream);
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    private static ReadOnlySpan<byte> Signature =>
+        new byte[] { (byte)'7', (byte)'z', 0xBC, 0xAF, 0x27, 0x1C };
+
+    private static bool SignatureMatch(Stream stream)
+    {
+        var reader = new BinaryReader(stream);
+        ReadOnlySpan<byte> signatureBytes = reader.ReadBytes(6);
+        return signatureBytes.SequenceEqual(Signature);
+    }
+
     protected override IReader CreateReaderForSolidExtraction() =>
         new SevenZipReader(ReaderOptions, this);
 
@@ -107,6 +298,9 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
                 _currentEntry = dir;
                 yield return dir;
             }
+            // For non-directory entries, yield them without creating shared streams
+            // Each call to GetEntryStream() will create a fresh decompression stream
+            // to avoid state corruption issues with async operations
             foreach (var entry in entries.Where(x => !x.IsDirectory))
             {
                 _currentEntry = entry;
@@ -116,6 +310,13 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
 
         protected override EntryStream GetEntryStream()
         {
+            // Create a fresh decompression stream for each file (no state sharing).
+            // However, the LZMA decoder has bugs in its async implementation that cause
+            // state corruption even on fresh streams. The SyncOnlyStream wrapper
+            // works around these bugs by forcing async operations to use sync equivalents.
+            //
+            // TODO: Fix the LZMA decoder async bugs (in LzmaStream, Decoder, OutWindow)
+            // so this wrapper is no longer necessary.
             var entry = _currentEntry.NotNull("currentEntry is not null");
             if (entry.IsDirectory)
             {
@@ -125,6 +326,15 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
         }
     }
 
+    /// <summary>
+    /// WORKAROUND: Forces async operations to use synchronous equivalents.
+    /// This is necessary because the LZMA decoder has bugs in its async implementation
+    /// that cause state corruption (IndexOutOfRangeException, DataErrorException).
+    ///
+    /// The proper fix would be to repair the LZMA decoder's async methods
+    /// (LzmaStream.ReadAsync, Decoder.CodeAsync, OutWindow async operations),
+    /// but that requires deep changes to the decoder state machine.
+    /// </summary>
     private sealed class SyncOnlyStream : Stream
     {
         private readonly Stream _baseStream;
@@ -154,6 +364,7 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
         public override void Write(byte[] buffer, int offset, int count) =>
             _baseStream.Write(buffer, offset, count);
 
+        // Force async operations to use sync equivalents to avoid LZMA decoder bugs
         public override Task<int> ReadAsync(
             byte[] buffer,
             int offset,
@@ -184,7 +395,7 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
             return Task.CompletedTask;
         }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
         public override ValueTask<int> ReadAsync(
             Memory<byte> buffer,
             CancellationToken cancellationToken = default

src/SharpCompress/Archives/SevenZip/SevenZipArchiveEntry.cs

@@ -12,8 +12,9 @@ public class SevenZipArchiveEntry : SevenZipEntry, IArchiveEntry
 
     public Stream OpenEntryStream() => FilePart.GetCompressedStream();
 
-    public ValueTask<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default) =>
-        new(OpenEntryStream());
+    public async ValueTask<Stream> OpenEntryStreamAsync(
+        CancellationToken cancellationToken = default
+    ) => OpenEntryStream();
 
     public IArchive Archive { get; }
 

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

@@ -1,171 +0,0 @@
-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;
-using SharpCompress.Common.Tar.Headers;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-using SharpCompress.Writers;
-using SharpCompress.Writers.Tar;
-
-namespace SharpCompress.Archives.Tar;
-
-public partial class TarArchive
-#if NET8_0_OR_GREATER
-    : IWritableArchiveOpenable,
-        IMultiArchiveOpenable<IWritableArchive, IWritableAsyncArchive>
-#endif
-{
-    public static IWritableArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
-    {
-        filePath.NotNullOrEmpty(nameof(filePath));
-        return OpenArchive(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
-    }
-
-    public static IWritableArchive OpenArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfo.NotNull(nameof(fileInfo));
-        return new TarArchive(
-            new SourceStream(
-                fileInfo,
-                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfos.NotNull(nameof(fileInfos));
-        var files = fileInfos.ToArray();
-        return new TarArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        streams.NotNull(nameof(streams));
-        var strms = streams.ToArray();
-        return new TarArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        stream.NotNull(nameof(stream));
-
-        if (stream is not { CanSeek: true })
-        {
-            throw new ArgumentException("Stream must be seekable", nameof(stream));
-        }
-
-        return new TarArchive(
-            new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions())
-        );
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(stream, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(new FileInfo(path), readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(streams, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
-
-    public static bool IsTarFile(string filePath) => IsTarFile(new FileInfo(filePath));
-
-    public static bool IsTarFile(FileInfo fileInfo)
-    {
-        if (!fileInfo.Exists)
-        {
-            return false;
-        }
-        using Stream stream = fileInfo.OpenRead();
-        return IsTarFile(stream);
-    }
-
-    public static bool IsTarFile(Stream stream)
-    {
-        try
-        {
-            var tarHeader = new TarHeader(new ArchiveEncoding());
-            var readSucceeded = tarHeader.Read(new BinaryReader(stream));
-            var isEmptyArchive =
-                tarHeader.Name?.Length == 0
-                && tarHeader.Size == 0
-                && Enum.IsDefined(typeof(EntryType), tarHeader.EntryType);
-            return readSucceeded || isEmptyArchive;
-        }
-        catch { }
-        return false;
-    }
-
-    public static IWritableArchive CreateArchive() => new TarArchive();
-
-    public static IWritableAsyncArchive CreateAsyncArchive() => new TarArchive();
-}

src/SharpCompress/Archives/Tar/TarArchive.cs

@@ -15,14 +15,196 @@ using SharpCompress.Writers.Tar;
 
 namespace SharpCompress.Archives.Tar;
 
-public partial class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
+public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
 {
-    protected override IEnumerable<TarVolume> LoadVolumes(SourceStream sourceStream)
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    public static TarArchive Open(string filePath, ReaderOptions? readerOptions = null)
     {
-        sourceStream.NotNull("SourceStream is null").LoadAllParts();
-        return new TarVolume(sourceStream, ReaderOptions, 1).AsEnumerable();
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
     }
 
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    public static TarArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        return new TarArchive(
+            new SourceStream(
+                fileInfo,
+                i => ArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    public static TarArchive Open(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        return new TarArchive(
+            new SourceStream(
+                files[0],
+                i => i < files.Length ? files[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    public static TarArchive Open(IEnumerable<Stream> streams, ReaderOptions? readerOptions = null)
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        return new TarArchive(
+            new SourceStream(
+                strms[0],
+                i => i < strms.Length ? strms[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    public static TarArchive Open(Stream stream, ReaderOptions? readerOptions = null)
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        return new TarArchive(
+            new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions())
+        );
+    }
+
+    /// <summary>
+    /// Opens a TarArchive asynchronously from a stream.
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a TarArchive asynchronously from a FileInfo.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfo, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a TarArchive asynchronously from multiple streams.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(streams, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a TarArchive asynchronously from multiple FileInfo objects.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfos, readerOptions));
+    }
+
+    public static bool IsTarFile(string filePath) => IsTarFile(new FileInfo(filePath));
+
+    public static bool IsTarFile(FileInfo fileInfo)
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return IsTarFile(stream);
+    }
+
+    public static bool IsTarFile(Stream stream)
+    {
+        try
+        {
+            var tarHeader = new TarHeader(new ArchiveEncoding());
+            var readSucceeded = tarHeader.Read(new BinaryReader(stream));
+            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
+        return new TarVolume(sourceStream, ReaderOptions, 1).AsEnumerable(); //simple single volume or split, multivolume not supported
+    }
+
+    /// <summary>
+    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    /// </summary>
+    /// <param name="sourceStream"></param>
     private TarArchive(SourceStream sourceStream)
         : base(ArchiveType.Tar, sourceStream) { }
 
@@ -87,6 +269,8 @@ public partial class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVo
         }
     }
 
+    public static TarArchive Create() => new();
+
     protected override TarArchiveEntry CreateEntryInternal(
         string filePath,
         Stream source,
@@ -180,13 +364,13 @@ public partial class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVo
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return TarReader.OpenReader(stream);
+        return TarReader.Open(stream);
     }
 
     protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return new((IAsyncReader)TarReader.OpenReader(stream));
+        return new(TarReader.Open(stream));
     }
 }

src/SharpCompress/Archives/Tar/TarArchiveEntry.cs

@@ -14,8 +14,9 @@ public class TarArchiveEntry : TarEntry, IArchiveEntry
 
     public virtual Stream OpenEntryStream() => Parts.Single().GetCompressedStream().NotNull();
 
-    public ValueTask<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default) =>
-        new(OpenEntryStream());
+    public async ValueTask<Stream> OpenEntryStreamAsync(
+        CancellationToken cancellationToken = default
+    ) => OpenEntryStream();
 
     #region IArchiveEntry Members
 

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

@@ -1,324 +0,0 @@
-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.Zip;
-using SharpCompress.Common.Zip.Headers;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-
-namespace SharpCompress.Archives.Zip;
-
-public partial class ZipArchive
-#if NET8_0_OR_GREATER
-    : IWritableArchiveOpenable,
-        IMultiArchiveOpenable<IWritableArchive, IWritableAsyncArchive>
-#endif
-{
-    public static IWritableArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
-    {
-        filePath.NotNullOrEmpty(nameof(filePath));
-        return OpenArchive(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
-    }
-
-    public static IWritableArchive OpenArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfo.NotNull(nameof(fileInfo));
-        return new ZipArchive(
-            new SourceStream(
-                fileInfo,
-                i => ZipArchiveVolumeFactory.GetFilePart(i, fileInfo),
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        fileInfos.NotNull(nameof(fileInfos));
-        var files = fileInfos.ToArray();
-        return new ZipArchive(
-            new SourceStream(
-                files[0],
-                i => i < files.Length ? files[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(
-        IEnumerable<Stream> streams,
-        ReaderOptions? readerOptions = null
-    )
-    {
-        streams.NotNull(nameof(streams));
-        var strms = streams.ToArray();
-        return new ZipArchive(
-            new SourceStream(
-                strms[0],
-                i => i < strms.Length ? strms[i] : null,
-                readerOptions ?? new ReaderOptions()
-            )
-        );
-    }
-
-    public static IWritableArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        stream.NotNull(nameof(stream));
-
-        if (stream is not { CanSeek: true })
-        {
-            throw new ArgumentException("Stream must be seekable", nameof(stream));
-        }
-
-        return new ZipArchive(
-            new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions())
-        );
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        string path,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(path, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        Stream stream,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(stream, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        FileInfo fileInfo,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(streams, readerOptions);
-    }
-
-    public static IWritableAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IWritableAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
-
-    public static bool IsZipFile(
-        string filePath,
-        string? password = null,
-        int bufferSize = ReaderOptions.DefaultBufferSize
-    ) => IsZipFile(new FileInfo(filePath), password, bufferSize);
-
-    public static bool IsZipFile(
-        FileInfo fileInfo,
-        string? password = null,
-        int bufferSize = ReaderOptions.DefaultBufferSize
-    )
-    {
-        if (!fileInfo.Exists)
-        {
-            return false;
-        }
-        using Stream stream = fileInfo.OpenRead();
-        return IsZipFile(stream, password, bufferSize);
-    }
-
-    public static bool IsZipFile(
-        Stream stream,
-        string? password = null,
-        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 = headerFactory
-                .ReadStreamHeader(stream)
-                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
-            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,
-        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 = headerFactory
-                .ReadStreamHeader(stream)
-                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
-            if (header is null)
-            {
-                if (stream.CanSeek)
-                {
-                    var z = new SeekableZipHeaderFactory(password, new ArchiveEncoding());
-                    var x = z.ReadSeekableHeader(stream, useSync: true).FirstOrDefault();
-                    return x?.ZipHeaderType == ZipHeaderType.DirectoryEntry;
-                }
-                else
-                {
-                    return false;
-                }
-            }
-            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
-        }
-        catch (CryptographicException)
-        {
-            return true;
-        }
-        catch
-        {
-            return false;
-        }
-    }
-
-    public static async ValueTask<bool> IsZipFileAsync(
-        Stream stream,
-        string? password = null,
-        int bufferSize = ReaderOptions.DefaultBufferSize,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        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)
-                .Where(x => x.ZipHeaderType != ZipHeaderType.Split)
-                .FirstOrDefaultAsync(cancellationToken);
-            if (header is null)
-            {
-                return false;
-            }
-            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
-        }
-        catch (CryptographicException)
-        {
-            return true;
-        }
-        catch
-        {
-            return false;
-        }
-    }
-
-    public static IWritableArchive CreateArchive() => new ZipArchive();
-
-    public static IWritableAsyncArchive CreateAsyncArchive() => new ZipArchive();
-
-    public static async ValueTask<bool> IsZipMultiAsync(
-        Stream stream,
-        string? password = null,
-        int bufferSize = ReaderOptions.DefaultBufferSize,
-        CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        var headerFactory = new StreamingZipHeaderFactory(password, new ArchiveEncoding(), null);
-        try
-        {
-            if (stream is not SharpCompressStream)
-            {
-                stream = new SharpCompressStream(stream, bufferSize: bufferSize);
-            }
-
-            var header = headerFactory
-                .ReadStreamHeader(stream)
-                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
-            if (header is null)
-            {
-                if (stream.CanSeek)
-                {
-                    var z = new SeekableZipHeaderFactory(password, new ArchiveEncoding());
-                    ZipHeader? x = null;
-                    await foreach (
-                        var h in z.ReadSeekableHeaderAsync(stream)
-                            .WithCancellation(cancellationToken)
-                    )
-                    {
-                        x = h;
-                        break;
-                    }
-                    return x?.ZipHeaderType == ZipHeaderType.DirectoryEntry;
-                }
-                else
-                {
-                    return false;
-                }
-            }
-            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
-        }
-        catch (CryptographicException)
-        {
-            return true;
-        }
-        catch
-        {
-            return false;
-        }
-    }
-}

src/SharpCompress/Archives/Zip/ZipArchive.cs

@@ -16,12 +16,21 @@ using SharpCompress.Writers.Zip;
 
 namespace SharpCompress.Archives.Zip;
 
-public partial class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
+public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
 {
     private readonly SeekableZipHeaderFactory? headerFactory;
 
+    /// <summary>
+    /// Gets or sets the compression level applied to files added to the archive,
+    /// if the compression method is set to deflate
+    /// </summary>
     public CompressionLevel DeflateCompressionLevel { get; set; }
 
+    /// <summary>
+    /// Constructor with a SourceStream able to handle FileInfo and Streams.
+    /// </summary>
+    /// <param name="sourceStream"></param>
+    /// <param name="options"></param>
     internal ZipArchive(SourceStream sourceStream)
         : base(ArchiveType.Zip, sourceStream) =>
         headerFactory = new SeekableZipHeaderFactory(
@@ -29,36 +38,371 @@ public partial class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVo
             sourceStream.ReaderOptions.ArchiveEncoding
         );
 
-    internal ZipArchive()
-        : base(ArchiveType.Zip) { }
+    /// <summary>
+    /// Constructor expects a filepath to an existing file.
+    /// </summary>
+    /// <param name="filePath"></param>
+    /// <param name="readerOptions"></param>
+    public static ZipArchive Open(string filePath, ReaderOptions? readerOptions = null)
+    {
+        filePath.NotNullOrEmpty(nameof(filePath));
+        return Open(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
+    }
+
+    /// <summary>
+    /// Constructor with a FileInfo object to an existing file.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    public static ZipArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
+    {
+        fileInfo.NotNull(nameof(fileInfo));
+        return new ZipArchive(
+            new SourceStream(
+                fileInfo,
+                i => ZipArchiveVolumeFactory.GetFilePart(i, fileInfo),
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all file parts passed in
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    public static ZipArchive Open(
+        IEnumerable<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var files = fileInfos.ToArray();
+        return new ZipArchive(
+            new SourceStream(
+                files[0],
+                i => i < files.Length ? files[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Constructor with all stream parts passed in
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    public static ZipArchive Open(IEnumerable<Stream> streams, ReaderOptions? readerOptions = null)
+    {
+        streams.NotNull(nameof(streams));
+        var strms = streams.ToArray();
+        return new ZipArchive(
+            new SourceStream(
+                strms[0],
+                i => i < strms.Length ? strms[i] : null,
+                readerOptions ?? new ReaderOptions()
+            )
+        );
+    }
+
+    /// <summary>
+    /// Takes a seekable Stream as a source
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    public static ZipArchive Open(Stream stream, ReaderOptions? readerOptions = null)
+    {
+        stream.NotNull(nameof(stream));
+
+        if (stream is not { CanSeek: true })
+        {
+            throw new ArgumentException("Stream must be seekable", nameof(stream));
+        }
+
+        return new ZipArchive(
+            new SourceStream(stream, i => null, readerOptions ?? new ReaderOptions())
+        );
+    }
+
+    /// <summary>
+    /// Opens a ZipArchive asynchronously from a stream.
+    /// </summary>
+    /// <param name="stream"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a ZipArchive asynchronously from a FileInfo.
+    /// </summary>
+    /// <param name="fileInfo"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfo, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a ZipArchive asynchronously from multiple streams.
+    /// </summary>
+    /// <param name="streams"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(streams, readerOptions));
+    }
+
+    /// <summary>
+    /// Opens a ZipArchive asynchronously from multiple FileInfo objects.
+    /// </summary>
+    /// <param name="fileInfos"></param>
+    /// <param name="readerOptions"></param>
+    /// <param name="cancellationToken"></param>
+    public static ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(fileInfos, readerOptions));
+    }
+
+    public static bool IsZipFile(
+        string filePath,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => IsZipFile(new FileInfo(filePath), password, bufferSize);
+
+    public static bool IsZipFile(
+        FileInfo fileInfo,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    )
+    {
+        if (!fileInfo.Exists)
+        {
+            return false;
+        }
+        using Stream stream = fileInfo.OpenRead();
+        return IsZipFile(stream, password, bufferSize);
+    }
+
+    public static bool IsZipFile(
+        Stream stream,
+        string? password = null,
+        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 = headerFactory
+                .ReadStreamHeader(stream)
+                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
+            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,
+        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 = headerFactory
+                .ReadStreamHeader(stream)
+                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
+            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, useSync: true).FirstOrDefault();
+                    return x?.ZipHeaderType == ZipHeaderType.DirectoryEntry;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
+        }
+        catch (CryptographicException)
+        {
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    public static async ValueTask<bool> IsZipFileAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        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)
+                .Where(x => x.ZipHeaderType != ZipHeaderType.Split)
+                .FirstOrDefaultAsync();
+            if (header is null)
+            {
+                return false;
+            }
+            return Enum.IsDefined(typeof(ZipHeaderType), header.ZipHeaderType);
+        }
+        catch (CryptographicException)
+        {
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    public static async ValueTask<bool> IsZipMultiAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        var headerFactory = new StreamingZipHeaderFactory(password, new ArchiveEncoding(), null);
+        try
+        {
+            if (stream is not SharpCompressStream)
+            {
+                stream = new SharpCompressStream(stream, bufferSize: bufferSize);
+            }
+
+            var header = headerFactory
+                .ReadStreamHeader(stream)
+                .FirstOrDefault(x => x.ZipHeaderType != ZipHeaderType.Split);
+            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());
+                    ZipHeader? x = null;
+                    await foreach (
+                        var h in z.ReadSeekableHeaderAsync(stream)
+                            .WithCancellation(cancellationToken)
+                    )
+                    {
+                        x = h;
+                        break;
+                    }
+                    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();
+        stream.LoadAllParts(); //request all streams
         stream.Position = 0;
 
         var streams = stream.Streams.ToList();
         var idx = 0;
-        if (streams.Count() > 1)
+        if (streams.Count() > 1) //test part 2 - true = multipart not split
         {
-            streams[1].Position += 4;
+            streams[1].Position += 4; //skip the POST_DATA_DESCRIPTOR to prevent an exception
             var isZip = IsZipFile(streams[1], ReaderOptions.Password, ReaderOptions.BufferSize);
             streams[1].Position -= 4;
             if (isZip)
             {
                 stream.IsVolumes = true;
 
-                var tmp = streams[0];
+                var tmp = streams[0]; //arcs as zip, z01 ... swap the zip the end
                 streams.RemoveAt(0);
                 streams.Add(tmp);
 
+                //streams[0].Position = 4; //skip the POST_DATA_DESCRIPTOR to prevent an exception
                 return streams.Select(a => new ZipVolume(a, ReaderOptions, idx++));
             }
         }
 
+        //split mode or single file
         return new ZipVolume(stream, ReaderOptions, idx++).AsEnumerable();
     }
 
+    internal ZipArchive()
+        : base(ArchiveType.Zip) { }
+
     protected override IEnumerable<ZipArchiveEntry> LoadEntries(IEnumerable<ZipVolume> volumes)
     {
         var vols = volumes.ToArray();
@@ -240,17 +584,19 @@ public partial class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVo
         DateTime? modified
     ) => new ZipWritableArchiveEntry(this, directoryPath, modified);
 
+    public static ZipArchive Create() => new();
+
     protected override IReader CreateReaderForSolidExtraction()
     {
         var stream = Volumes.Single().Stream;
         ((IStreamStack)stream).StackSeek(0);
-        return ZipReader.OpenReader(stream, ReaderOptions, Entries);
+        return ZipReader.Open(stream, ReaderOptions, Entries);
     }
 
     protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
     {
         var stream = Volumes.Single().Stream;
         stream.Position = 0;
-        return new((IAsyncReader)ZipReader.OpenReader(stream));
+        return new(ZipReader.Open(stream));
     }
 }

src/SharpCompress/Common/AsyncBinaryReader.cs

@@ -51,19 +51,11 @@ namespace SharpCompress.Common
             return BinaryPrimitives.ReadUInt64LittleEndian(_buffer);
         }
 
-        public async ValueTask ReadBytesAsync(
-            byte[] bytes,
-            int offset,
-            int count,
-            CancellationToken ct = default
-        )
+        public async ValueTask<byte[]> ReadBytesAsync(int count, CancellationToken ct = default)
         {
-            await _stream.ReadExactAsync(bytes, offset, count, ct).ConfigureAwait(false);
-        }
-
-        public async ValueTask SkipAsync(int count, CancellationToken ct = default)
-        {
-            await _stream.SkipAsync(count, ct).ConfigureAwait(false);
+            var result = new byte[count];
+            await _stream.ReadExactAsync(result, 0, count, ct).ConfigureAwait(false);
+            return result;
         }
 
         public void Dispose()
@@ -82,7 +74,7 @@ namespace SharpCompress.Common
             }
         }
 
-#if NET8_0_OR_GREATER
+#if NET6_0_OR_GREATER
         public async ValueTask DisposeAsync()
         {
             if (_disposed)

src/SharpCompress/Common/EntryStream.cs

@@ -93,7 +93,7 @@ public class EntryStream : Stream, IStreamStack
         _stream.Dispose();
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask DisposeAsync()
     {
         if (_isDisposed)
@@ -171,7 +171,7 @@ public class EntryStream : Stream, IStreamStack
         return read;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Common/GZip/GZipEntry.cs

@@ -40,6 +40,6 @@ public class GZipEntry : Entry
 
     internal static IEnumerable<GZipEntry> GetEntries(Stream stream, OptionsBase options)
     {
-        yield return new GZipEntry(GZipFilePart.Create(stream, options.ArchiveEncoding));
+        yield return new GZipEntry(new GZipFilePart(stream, options.ArchiveEncoding));
     }
 }

src/SharpCompress/Common/GZip/GZipFilePart.cs

@@ -2,8 +2,6 @@ using System;
 using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.IO;
-using System.Threading;
-using System.Threading.Tasks;
 using SharpCompress.Common.Tar.Headers;
 using SharpCompress.Compressors;
 using SharpCompress.Compressors.Deflate;
@@ -15,58 +13,28 @@ internal sealed class GZipFilePart : FilePart
     private string? _name;
     private readonly Stream _stream;
 
-    internal static GZipFilePart Create(Stream stream, IArchiveEncoding archiveEncoding)
+    internal GZipFilePart(Stream stream, IArchiveEncoding archiveEncoding)
+        : base(archiveEncoding)
     {
-        var part = new GZipFilePart(stream, archiveEncoding);
-
-        part.ReadAndValidateGzipHeader();
+        _stream = stream;
+        ReadAndValidateGzipHeader();
         if (stream.CanSeek)
         {
             var position = stream.Position;
             stream.Position = stream.Length - 8;
-            part.ReadTrailer();
+            ReadTrailer();
             stream.Position = position;
-            part.EntryStartPosition = position;
+            EntryStartPosition = position;
         }
         else
         {
             // For non-seekable streams, we can't read the trailer or track position.
             // Set to 0 since the stream will be read sequentially from its current position.
-            part.EntryStartPosition = 0;
+            EntryStartPosition = 0;
         }
-        return part;
     }
 
-    internal static async ValueTask<GZipFilePart> CreateAsync(
-        Stream stream,
-        IArchiveEncoding archiveEncoding,
-        CancellationToken cancellationToken = default
-    )
-    {
-        var part = new GZipFilePart(stream, archiveEncoding);
-
-        await part.ReadAndValidateGzipHeaderAsync(cancellationToken);
-        if (stream.CanSeek)
-        {
-            var position = stream.Position;
-            stream.Position = stream.Length - 8;
-            await part.ReadTrailerAsync(cancellationToken);
-            stream.Position = position;
-            part.EntryStartPosition = position;
-        }
-        else
-        {
-            // For non-seekable streams, we can't read the trailer or track position.
-            // Set to 0 since the stream will be read sequentially from its current position.
-            part.EntryStartPosition = 0;
-        }
-        return part;
-    }
-
-    private GZipFilePart(Stream stream, IArchiveEncoding archiveEncoding)
-        : base(archiveEncoding) => _stream = stream;
-
-    internal long EntryStartPosition { get; private set; }
+    internal long EntryStartPosition { get; }
 
     internal DateTime? DateModified { get; private set; }
     internal uint? Crc { get; private set; }
@@ -83,22 +51,12 @@ internal sealed class GZipFilePart : FilePart
     {
         // Read and potentially verify the GZIP trailer: CRC32 and  size mod 2^32
         Span<byte> trailer = stackalloc byte[8];
-        _stream.ReadFully(trailer);
+        var n = _stream.Read(trailer);
 
         Crc = BinaryPrimitives.ReadUInt32LittleEndian(trailer);
         UncompressedSize = BinaryPrimitives.ReadUInt32LittleEndian(trailer.Slice(4));
     }
 
-    private async ValueTask ReadTrailerAsync(CancellationToken cancellationToken = default)
-    {
-        // Read and potentially verify the GZIP trailer: CRC32 and  size mod 2^32
-        var trailer = new byte[8];
-        _ = await _stream.ReadFullyAsync(trailer, 0, 8, cancellationToken);
-
-        Crc = BinaryPrimitives.ReadUInt32LittleEndian(trailer);
-        UncompressedSize = BinaryPrimitives.ReadUInt32LittleEndian(trailer.AsSpan().Slice(4));
-    }
-
     private void ReadAndValidateGzipHeader()
     {
         // read the header on the first read
@@ -151,61 +109,6 @@ internal sealed class GZipFilePart : FilePart
         }
     }
 
-    private async ValueTask ReadAndValidateGzipHeaderAsync(
-        CancellationToken cancellationToken = default
-    )
-    {
-        // read the header on the first read
-        var header = new byte[10];
-        var n = await _stream.ReadAsync(header, 0, 10, cancellationToken);
-
-        // workitem 8501: handle edge case (decompress empty stream)
-        if (n == 0)
-        {
-            return;
-        }
-
-        if (n != 10)
-        {
-            throw new ZlibException("Not a valid GZIP stream.");
-        }
-
-        if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
-        {
-            throw new ZlibException("Bad GZIP header.");
-        }
-
-        var timet = BinaryPrimitives.ReadInt32LittleEndian(header.AsSpan().Slice(4));
-        DateModified = TarHeader.EPOCH.AddSeconds(timet);
-        if ((header[3] & 0x04) == 0x04)
-        {
-            // read and discard extra field
-            var lengthField = new byte[2];
-            _ = await _stream.ReadAsync(lengthField, 0, 2, cancellationToken);
-
-            var extraLength = (short)(lengthField[0] + (lengthField[1] * 256));
-            var extra = new byte[extraLength];
-
-            if (!await _stream.ReadFullyAsync(extra, cancellationToken))
-            {
-                throw new ZlibException("Unexpected end-of-file reading GZIP header.");
-            }
-        }
-        if ((header[3] & 0x08) == 0x08)
-        {
-            _name = await ReadZeroTerminatedStringAsync(_stream, cancellationToken);
-        }
-        if ((header[3] & 0x10) == 0x010)
-        {
-            await ReadZeroTerminatedStringAsync(_stream, cancellationToken);
-        }
-        if ((header[3] & 0x02) == 0x02)
-        {
-            var buf = new byte[1];
-            _ = await _stream.ReadAsync(buf, 0, 1, cancellationToken); // CRC16, ignore
-        }
-    }
-
     private string ReadZeroTerminatedString(Stream stream)
     {
         Span<byte> buf1 = stackalloc byte[1];
@@ -231,33 +134,4 @@ internal sealed class GZipFilePart : FilePart
         var buffer = list.ToArray();
         return ArchiveEncoding.Decode(buffer);
     }
-
-    private async ValueTask<string> ReadZeroTerminatedStringAsync(
-        Stream stream,
-        CancellationToken cancellationToken = default
-    )
-    {
-        var buf1 = new byte[1];
-        var list = new List<byte>();
-        var done = false;
-        do
-        {
-            // workitem 7740
-            var n = await stream.ReadAsync(buf1, 0, 1, cancellationToken);
-            if (n != 1)
-            {
-                throw new ZlibException("Unexpected EOF reading GZIP header.");
-            }
-            if (buf1[0] == 0)
-            {
-                done = true;
-            }
-            else
-            {
-                list.Add(buf1[0]);
-            }
-        } while (!done);
-        var buffer = list.ToArray();
-        return ArchiveEncoding.Decode(buffer);
-    }
 }

src/SharpCompress/Common/Tar/TarFilePart.cs

@@ -1,6 +1,5 @@
 using System.IO;
 using SharpCompress.Common.Tar.Headers;
-using SharpCompress.IO;
 
 namespace SharpCompress.Common.Tar;
 
@@ -21,45 +20,8 @@ internal sealed class TarFilePart : FilePart
 
     internal override Stream GetCompressedStream()
     {
-        if (_seekableStream is not null)
+        if (_seekableStream != null)
         {
-            // If the seekable stream is a SourceStream in file mode with multi-threading enabled,
-            // create an independent stream to support concurrent extraction
-            if (
-                _seekableStream is SourceStream sourceStream
-                && sourceStream.IsFileMode
-                && sourceStream.ReaderOptions.EnableMultiThreadedExtraction
-            )
-            {
-                var independentStream = sourceStream.CreateIndependentStream(0);
-                if (independentStream is not null)
-                {
-                    independentStream.Position = Header.DataStartPosition ?? 0;
-                    return new TarReadOnlySubStream(independentStream, Header.Size);
-                }
-            }
-
-            // Check if the seekable stream wraps a FileStream
-            Stream? underlyingStream = _seekableStream;
-            if (_seekableStream is IStreamStack streamStack)
-            {
-                underlyingStream = streamStack.BaseStream();
-            }
-
-            if (underlyingStream is FileStream fileStream)
-            {
-                // Create a new independent stream from the file
-                var independentStream = new FileStream(
-                    fileStream.Name,
-                    FileMode.Open,
-                    FileAccess.Read,
-                    FileShare.Read
-                );
-                independentStream.Position = Header.DataStartPosition ?? 0;
-                return new TarReadOnlySubStream(independentStream, Header.Size);
-            }
-
-            // Fall back to existing behavior for stream-based sources
             _seekableStream.Position = Header.DataStartPosition ?? 0;
             return new TarReadOnlySubStream(_seekableStream, Header.Size);
         }

src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs

@@ -66,7 +66,7 @@ internal class TarReadOnlySubStream : SharpCompressStream, IStreamStack
         base.Dispose(disposing);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async System.Threading.Tasks.ValueTask DisposeAsync()
     {
         if (_isDisposed)
@@ -170,7 +170,7 @@ internal class TarReadOnlySubStream : SharpCompressStream, IStreamStack
         return read;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         System.Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default

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

@@ -29,8 +29,7 @@ internal class DirectoryEndHeader : ZipHeader
         DirectorySize = await reader.ReadUInt32Async();
         DirectoryStartOffsetRelativeToDisk = await reader.ReadUInt32Async();
         CommentLength = await reader.ReadUInt16Async();
-        Comment = new byte[CommentLength];
-        await reader.ReadBytesAsync(Comment, 0, CommentLength);
+        Comment = await reader.ReadBytesAsync(CommentLength);
     }
 
     public ushort VolumeNumber { get; private set; }

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

@@ -53,12 +53,10 @@ internal class DirectoryEntryHeader : ZipFileEntry
         InternalFileAttributes = await reader.ReadUInt16Async();
         ExternalFileAttributes = await reader.ReadUInt32Async();
         RelativeOffsetOfEntryHeader = await reader.ReadUInt32Async();
-        var name = new byte[nameLength];
-        var extra = new byte[extraLength];
-        var comment = new byte[commentLength];
-        await reader.ReadBytesAsync(name, 0, nameLength);
-        await reader.ReadBytesAsync(extra, 0, extraLength);
-        await reader.ReadBytesAsync(comment, 0, commentLength);
+
+        var name = await reader.ReadBytesAsync(nameLength);
+        var extra = await reader.ReadBytesAsync(extraLength);
+        var comment = await reader.ReadBytesAsync(commentLength);
 
         ProcessReadData(name, extra, comment);
     }

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

@@ -37,10 +37,8 @@ internal class LocalEntryHeader(IArchiveEncoding archiveEncoding)
         UncompressedSize = await reader.ReadUInt32Async();
         var nameLength = await reader.ReadUInt16Async();
         var extraLength = await reader.ReadUInt16Async();
-        var name = new byte[nameLength];
-        var extra = new byte[extraLength];
-        await reader.ReadBytesAsync(name, 0, nameLength);
-        await reader.ReadBytesAsync(extra, 0, extraLength);
+        var name = await reader.ReadBytesAsync(nameLength);
+        var extra = await reader.ReadBytesAsync(extraLength);
 
         ProcessReadData(name, extra);
     }

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

@@ -38,11 +38,12 @@ internal class Zip64DirectoryEndHeader : ZipHeader
         TotalNumberOfEntries = (long)await reader.ReadUInt64Async();
         DirectorySize = (long)await reader.ReadUInt64Async();
         DirectoryStartOffsetRelativeToDisk = (long)await reader.ReadUInt64Async();
-        var size = (int)(
-            SizeOfDirectoryEndRecord - SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS
+        DataSector = await reader.ReadBytesAsync(
+            (int)(
+                SizeOfDirectoryEndRecord
+                - SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS
+            )
         );
-        DataSector = new byte[size];
-        await reader.ReadBytesAsync(DataSector, 0, size);
     }
 
     private const int SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS = 44;

src/SharpCompress/Common/Zip/SeekableZipFilePart.cs

@@ -2,16 +2,13 @@ using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
-using SharpCompress.IO;
 
 namespace SharpCompress.Common.Zip;
 
 internal class SeekableZipFilePart : ZipFilePart
 {
-    private volatile bool _isLocalHeaderLoaded;
+    private bool _isLocalHeaderLoaded;
     private readonly SeekableZipHeaderFactory _headerFactory;
-    private readonly object _headerLock = new();
-    private readonly SemaphoreSlim _asyncHeaderSemaphore = new(1, 1);
 
     internal SeekableZipFilePart(
         SeekableZipHeaderFactory headerFactory,
@@ -24,14 +21,8 @@ internal class SeekableZipFilePart : ZipFilePart
     {
         if (!_isLocalHeaderLoaded)
         {
-            lock (_headerLock)
-            {
-                if (!_isLocalHeaderLoaded)
-                {
-                    LoadLocalHeader();
-                    _isLocalHeaderLoaded = true;
-                }
-            }
+            LoadLocalHeader();
+            _isLocalHeaderLoaded = true;
         }
         return base.GetCompressedStream();
     }
@@ -42,173 +33,22 @@ internal class SeekableZipFilePart : ZipFilePart
     {
         if (!_isLocalHeaderLoaded)
         {
-            await _asyncHeaderSemaphore.WaitAsync(cancellationToken);
-            try
-            {
-                if (!_isLocalHeaderLoaded)
-                {
-                    await LoadLocalHeaderAsync(cancellationToken);
-                    _isLocalHeaderLoaded = true;
-                }
-            }
-            finally
-            {
-                _asyncHeaderSemaphore.Release();
-            }
+            await LoadLocalHeaderAsync(cancellationToken);
+            _isLocalHeaderLoaded = true;
         }
         return await base.GetCompressedStreamAsync(cancellationToken);
     }
 
-    private void LoadLocalHeader()
-    {
-        // Use an independent stream for loading the header if multi-threading is enabled
-        Stream streamToUse = BaseStream;
-        bool disposeStream = false;
+    private void LoadLocalHeader() =>
+        Header = _headerFactory.GetLocalHeader(BaseStream, (DirectoryEntryHeader)Header);
 
-        if (
-            BaseStream is SourceStream sourceStream
-            && sourceStream.IsFileMode
-            && sourceStream.ReaderOptions.EnableMultiThreadedExtraction
-        )
-        {
-            var independentStream = sourceStream.CreateIndependentStream(0);
-            if (independentStream is not null)
-            {
-                streamToUse = independentStream;
-                disposeStream = true;
-            }
-        }
-        else
-        {
-            // Check if BaseStream wraps a FileStream
-            Stream? underlyingStream = BaseStream;
-            if (BaseStream is IStreamStack streamStack)
-            {
-                underlyingStream = streamStack.BaseStream();
-            }
-
-            if (underlyingStream is FileStream fileStream)
-            {
-                streamToUse = new FileStream(
-                    fileStream.Name,
-                    FileMode.Open,
-                    FileAccess.Read,
-                    FileShare.Read
-                );
-                disposeStream = true;
-            }
-        }
-
-        try
-        {
-            Header = _headerFactory.GetLocalHeader(streamToUse, (DirectoryEntryHeader)Header);
-        }
-        finally
-        {
-            if (disposeStream)
-            {
-                streamToUse.Dispose();
-            }
-        }
-    }
-
-    private async ValueTask LoadLocalHeaderAsync(CancellationToken cancellationToken = default)
-    {
-        // Use an independent stream for loading the header if multi-threading is enabled
-        Stream streamToUse = BaseStream;
-        bool disposeStream = false;
-
-        if (
-            BaseStream is SourceStream sourceStream
-            && sourceStream.IsFileMode
-            && sourceStream.ReaderOptions.EnableMultiThreadedExtraction
-        )
-        {
-            var independentStream = sourceStream.CreateIndependentStream(0);
-            if (independentStream is not null)
-            {
-                streamToUse = independentStream;
-                disposeStream = true;
-            }
-        }
-        else
-        {
-            // Check if BaseStream wraps a FileStream
-            Stream? underlyingStream = BaseStream;
-            if (BaseStream is IStreamStack streamStack)
-            {
-                underlyingStream = streamStack.BaseStream();
-            }
-
-            if (underlyingStream is FileStream fileStream)
-            {
-                streamToUse = new FileStream(
-                    fileStream.Name,
-                    FileMode.Open,
-                    FileAccess.Read,
-                    FileShare.Read
-                );
-                disposeStream = true;
-            }
-        }
-
-        try
-        {
-            Header = await _headerFactory.GetLocalHeaderAsync(
-                streamToUse,
-                (DirectoryEntryHeader)Header
-            );
-        }
-        finally
-        {
-            if (disposeStream)
-            {
-                streamToUse.Dispose();
-            }
-        }
-    }
+    private async ValueTask LoadLocalHeaderAsync(CancellationToken cancellationToken = default) =>
+        Header = await _headerFactory.GetLocalHeaderAsync(BaseStream, (DirectoryEntryHeader)Header);
 
     protected override Stream CreateBaseStream()
     {
-        // If BaseStream is a SourceStream in file mode with multi-threading enabled,
-        // create an independent stream to support concurrent extraction
-        if (
-            BaseStream is SourceStream sourceStream
-            && sourceStream.IsFileMode
-            && sourceStream.ReaderOptions.EnableMultiThreadedExtraction
-        )
-        {
-            // Create a new independent stream for this entry
-            var independentStream = sourceStream.CreateIndependentStream(0);
-            if (independentStream is not null)
-            {
-                independentStream.Position = Header.DataStartPosition.NotNull();
-                return independentStream;
-            }
-        }
-
-        // Check if BaseStream wraps a FileStream (for multi-volume archives)
-        Stream? underlyingStream = BaseStream;
-        if (BaseStream is IStreamStack streamStack)
-        {
-            underlyingStream = streamStack.BaseStream();
-        }
-
-        if (underlyingStream is FileStream fileStream)
-        {
-            // Create a new independent stream from the file
-            var independentStream = new FileStream(
-                fileStream.Name,
-                FileMode.Open,
-                FileAccess.Read,
-                FileShare.Read
-            );
-            independentStream.Position = Header.DataStartPosition.NotNull();
-            return independentStream;
-        }
-
-        // Fall back to existing behavior for stream-based sources
         BaseStream.Position = Header.DataStartPosition.NotNull();
+
         return BaseStream;
     }
 }

src/SharpCompress/Common/Zip/SeekableZipHeaderFactory.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Buffers;
 using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
@@ -17,8 +16,6 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
     private const int MAX_SEARCH_LENGTH_FOR_EOCD = 65557;
     private bool _zip64;
 
-    private static readonly byte[] needle = { 0x06, 0x05, 0x4b, 0x50 };
-
     internal SeekableZipHeaderFactory(string? password, IArchiveEncoding archiveEncoding)
         : base(StreamingMode.Seekable, password, archiveEncoding) { }
 
@@ -156,7 +153,74 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         }
     }
 
-    private static bool IsMatch(Span<byte> haystack, int position, byte[] needle)
+    internal async IAsyncEnumerable<ZipHeader> ReadSeekableHeaderAsync(Stream stream, bool useSync)
+    {
+        var reader = new AsyncBinaryReader(stream);
+
+        await SeekBackToHeaderAsync(stream, reader);
+
+        var eocd_location = stream.Position;
+        var entry = new DirectoryEndHeader();
+        await entry.Read(reader);
+
+        if (entry.IsZip64)
+        {
+            _zip64 = true;
+
+            // ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR should be before the EOCD
+            stream.Seek(eocd_location - ZIP64_EOCD_LENGTH - 4, SeekOrigin.Begin);
+            var zip64_locator = await reader.ReadUInt32Async();
+            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.Read(reader);
+
+            stream.Seek(zip64Locator.RelativeOffsetOfTheEndOfDirectoryRecord, SeekOrigin.Begin);
+            var zip64Signature = await reader.ReadUInt32Async();
+            if (zip64Signature != ZIP64_END_OF_CENTRAL_DIRECTORY)
+            {
+                throw new ArchiveException("Failed to locate the Zip64 Header");
+            }
+
+            var zip64Entry = new Zip64DirectoryEndHeader();
+            await zip64Entry.Read(reader);
+            stream.Seek(zip64Entry.DirectoryStartOffsetRelativeToDisk, SeekOrigin.Begin);
+        }
+        else
+        {
+            stream.Seek(entry.DirectoryStartOffsetRelativeToDisk, SeekOrigin.Begin);
+        }
+
+        var position = stream.Position;
+        while (true)
+        {
+            stream.Position = position;
+            var signature = await reader.ReadUInt32Async();
+            var nextHeader = await ReadHeader(signature, reader, _zip64);
+            position = stream.Position;
+
+            if (nextHeader is null)
+            {
+                yield break;
+            }
+
+            if (nextHeader is DirectoryEntryHeader entryHeader)
+            {
+                //entry could be zero bytes so we need to know that.
+                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++)
         {
@@ -183,35 +247,29 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
             stream.Length < MAX_SEARCH_LENGTH_FOR_EOCD
                 ? (int)stream.Length
                 : MAX_SEARCH_LENGTH_FOR_EOCD;
+        // We search for marker in reverse to find the first occurance
+        byte[] needle = { 0x06, 0x05, 0x4b, 0x50 };
 
         stream.Seek(-len, SeekOrigin.End);
-        var seek = ArrayPool<byte>.Shared.Rent(len);
 
-        try
+        var seek = await reader.ReadBytesAsync(len);
+
+        // Search in reverse
+        Array.Reverse(seek);
+
+        // don't exclude the minimum eocd region, otherwise you fail to locate the header in empty zip files
+        var max_search_area = len; // - MINIMUM_EOCD_LENGTH;
+
+        for (var pos_from_end = 0; pos_from_end < max_search_area; ++pos_from_end)
         {
-            await reader.ReadBytesAsync(seek, 0, len, default);
-            var memory = new Memory<byte>(seek, 0, len);
-            var span = memory.Span;
-            span.Reverse();
-
-            // don't exclude the minimum eocd region, otherwise you fail to locate the header in empty zip files
-            var max_search_area = len; // - MINIMUM_EOCD_LENGTH;
-
-            for (var pos_from_end = 0; pos_from_end < max_search_area; ++pos_from_end)
+            if (IsMatch(seek, pos_from_end, needle))
             {
-                if (IsMatch(span, pos_from_end, needle))
-                {
-                    stream.Seek(-pos_from_end, SeekOrigin.End);
-                    return;
-                }
+                stream.Seek(-pos_from_end, SeekOrigin.End);
+                return;
             }
+        }
 
-            throw new ArchiveException("Failed to locate the Zip Header");
-        }
-        finally
-        {
-            ArrayPool<byte>.Shared.Return(seek);
-        }
+        throw new ArchiveException("Failed to locate the Zip Header");
     }
 
     private static void SeekBackToHeader(Stream stream, BinaryReader reader)
@@ -228,6 +286,9 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
             stream.Length < MAX_SEARCH_LENGTH_FOR_EOCD
                 ? (int)stream.Length
                 : MAX_SEARCH_LENGTH_FOR_EOCD;
+        // We search for marker in reverse to find the first occurance
+        byte[] needle = { 0x06, 0x05, 0x4b, 0x50 };
+
         stream.Seek(-len, SeekOrigin.End);
 
         var seek = reader.ReadBytes(len);

src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs

@@ -20,7 +20,7 @@ internal class WinzipAesEncryptionData
     {
         _keySize = keySize;
 
-#if LEGACY_DOTNET
+#if NETFRAMEWORK || NETSTANDARD2_0
         var rfc2898 = new Rfc2898DeriveBytes(password, salt, RFC2898_ITERATIONS);
         KeyBytes = rfc2898.GetBytes(KeySizeInBytes);
         IvBytes = rfc2898.GetBytes(KeySizeInBytes);

src/SharpCompress/Common/Zip/ZipHeaderFactory.cs

@@ -79,7 +79,7 @@ internal class ZipHeaderFactory
                 }
                 else
                 {
-                    await reader.SkipAsync(zip64 ? 20 : 12);
+                    await reader.ReadBytesAsync(zip64 ? 20 : 12);
                 }
                 return null;
             }

src/SharpCompress/Compressors/BZip2/BZip2Stream.cs

@@ -98,7 +98,7 @@ public sealed class BZip2Stream : Stream, IStreamStack
 
     public override void SetLength(long value) => stream.SetLength(value);
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
 
     public override int Read(Span<byte> buffer) => stream.Read(buffer);
 

src/SharpCompress/Compressors/Deflate/DeflateStream.cs

@@ -299,7 +299,7 @@ public class DeflateStream : Stream, IStreamStack
         await _baseStream.FlushAsync(cancellationToken).ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask DisposeAsync()
     {
         if (_disposed)
@@ -370,7 +370,7 @@ public class DeflateStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -461,7 +461,7 @@ public class DeflateStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Deflate/GZipStream.cs

@@ -345,7 +345,7 @@ public class GZipStream : Stream, IStreamStack
         return n;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -454,7 +454,7 @@ public class GZipStream : Stream, IStreamStack
         await BaseStream.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Deflate/Inflate.cs

@@ -64,7 +64,6 @@
 // -----------------------------------------------------------------------
 
 using System;
-using System.Buffers;
 using SharpCompress.Algorithms;
 
 namespace SharpCompress.Compressors.Deflate;
@@ -117,14 +116,14 @@ internal sealed class InflateBlocks
     internal int readAt; // window read pointer
     internal int table; // table lengths (14 bits)
     internal int[] tb = new int[1]; // bit length decoding tree
-    internal IMemoryOwner<byte> window; // sliding window
+    internal byte[] window; // sliding window
     internal int writeAt; // window write pointer
 
     internal InflateBlocks(ZlibCodec codec, object checkfn, int w)
     {
         _codec = codec;
         hufts = new int[MANY * 3];
-        window = MemoryPool<byte>.Shared.Rent(w);
+        window = new byte[w];
         end = w;
         this.checkfn = checkfn;
         mode = InflateBlockMode.TYPE;
@@ -341,7 +340,7 @@ internal sealed class InflateBlocks
                     {
                         t = m;
                     }
-                    _codec.InputBuffer.AsSpan(p, t).CopyTo(window.Memory.Span.Slice(q));
+                    Array.Copy(_codec.InputBuffer, p, window, q, t);
                     p += t;
                     n -= t;
                     q += t;
@@ -716,14 +715,13 @@ internal sealed class InflateBlocks
     internal void Free()
     {
         Reset();
-        window?.Dispose();
         window = null;
         hufts = null;
     }
 
     internal void SetDictionary(byte[] d, int start, int n)
     {
-        d.AsSpan(start, n).CopyTo(window.Memory.Span.Slice(0, n));
+        Array.Copy(d, start, window, 0, n);
         readAt = writeAt = n;
     }
 
@@ -776,16 +774,11 @@ internal sealed class InflateBlocks
             // update check information
             if (checkfn != null)
             {
-                _codec._adler32 = check = Adler32.Calculate(
-                    check,
-                    window.Memory.Span.Slice(readAt, nBytes)
-                );
+                _codec._adler32 = check = Adler32.Calculate(check, window.AsSpan(readAt, nBytes));
             }
 
             // copy as far as end of window
-            window
-                .Memory.Span.Slice(readAt, nBytes)
-                .CopyTo(_codec.OutputBuffer.AsSpan(_codec.NextOut));
+            Array.Copy(window, readAt, _codec.OutputBuffer, _codec.NextOut, nBytes);
             _codec.NextOut += nBytes;
             readAt += nBytes;
 
@@ -1220,7 +1213,7 @@ internal sealed class InflateCodes
                             }
                         }
 
-                        blocks.window.Memory.Span[q++] = blocks.window.Memory.Span[f++];
+                        blocks.window[q++] = blocks.window[f++];
                         m--;
 
                         if (f == blocks.end)
@@ -1266,7 +1259,7 @@ internal sealed class InflateCodes
                     }
                     r = ZlibConstants.Z_OK;
 
-                    blocks.window.Memory.Span[q++] = (byte)lit;
+                    blocks.window[q++] = (byte)lit;
                     m--;
 
                     mode = START;
@@ -1403,7 +1396,7 @@ internal sealed class InflateCodes
                 b >>= (tp[tp_index_t_3 + 1]);
                 k -= (tp[tp_index_t_3 + 1]);
 
-                s.window.Memory.Span[q++] = (byte)tp[tp_index_t_3 + 2];
+                s.window[q++] = (byte)tp[tp_index_t_3 + 2];
                 m--;
                 continue;
             }
@@ -1468,14 +1461,13 @@ internal sealed class InflateCodes
                                 r = q - d;
                                 if (q - r > 0 && 2 > (q - r))
                                 {
-                                    s.window.Memory.Span[q++] = s.window.Memory.Span[r++]; // minimum count is three,
-                                    s.window.Memory.Span[q++] = s.window.Memory.Span[r++]; // so unroll loop a little
+                                    s.window[q++] = s.window[r++]; // minimum count is three,
+                                    s.window[q++] = s.window[r++]; // so unroll loop a little
                                     c -= 2;
                                 }
                                 else
                                 {
-                                    s.window.Memory.Span.Slice(r, 2)
-                                        .CopyTo(s.window.Memory.Span.Slice(q));
+                                    Array.Copy(s.window, r, s.window, q, 2);
                                     q += 2;
                                     r += 2;
                                     c -= 2;
@@ -1498,13 +1490,12 @@ internal sealed class InflateCodes
                                     {
                                         do
                                         {
-                                            s.window.Memory.Span[q++] = s.window.Memory.Span[r++];
+                                            s.window[q++] = s.window[r++];
                                         } while (--e != 0);
                                     }
                                     else
                                     {
-                                        s.window.Memory.Span.Slice(r, e)
-                                            .CopyTo(s.window.Memory.Span.Slice(q));
+                                        Array.Copy(s.window, r, s.window, q, e);
                                         q += e;
                                         r += e;
                                         e = 0;
@@ -1518,13 +1509,12 @@ internal sealed class InflateCodes
                             {
                                 do
                                 {
-                                    s.window.Memory.Span[q++] = s.window.Memory.Span[r++];
+                                    s.window[q++] = s.window[r++];
                                 } while (--c != 0);
                             }
                             else
                             {
-                                s.window.Memory.Span.Slice(r, c)
-                                    .CopyTo(s.window.Memory.Span.Slice(q));
+                                Array.Copy(s.window, r, s.window, q, c);
                                 q += c;
                                 r += c;
                                 c = 0;
@@ -1570,7 +1560,7 @@ internal sealed class InflateCodes
                     {
                         b >>= (tp[tp_index_t_3 + 1]);
                         k -= (tp[tp_index_t_3 + 1]);
-                        s.window.Memory.Span[q++] = (byte)tp[tp_index_t_3 + 2];
+                        s.window[q++] = (byte)tp[tp_index_t_3 + 2];
                         m--;
                         break;
                     }

src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs

@@ -552,7 +552,7 @@ internal class ZlibBaseStream : Stream, IStreamStack
         }
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask DisposeAsync()
     {
         if (isDisposed)
@@ -1171,7 +1171,7 @@ internal class ZlibBaseStream : Stream, IStreamStack
         return rc;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Deflate/ZlibConstants.cs

@@ -108,9 +108,13 @@ internal static class ZlibConstants
     public const int Z_BUF_ERROR = -5;
 
     /// <summary>
-    /// The size of the working buffer used in the ZlibCodec class. Defaults to 16384 bytes.
+    /// The size of the working buffer used in the ZlibCodec class. Defaults to 8192 bytes.
     /// </summary>
+#if NETCF
+    public const int WorkingBufferSizeDefault = 8192;
+#else
     public const int WorkingBufferSizeDefault = 16384;
+#endif
 
     /// <summary>
     /// The minimum size of the working buffer used in the ZlibCodec class.  Currently it is 128 bytes.

src/SharpCompress/Compressors/Deflate/ZlibStream.cs

@@ -277,7 +277,7 @@ public class ZlibStream : Stream, IStreamStack
         await _baseStream.FlushAsync(cancellationToken).ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask DisposeAsync()
     {
         if (_disposed)
@@ -347,7 +347,7 @@ public class ZlibStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -431,7 +431,7 @@ public class ZlibStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Deflate64/Deflate64Stream.cs

@@ -200,7 +200,7 @@ public sealed class Deflate64Stream : Stream, IStreamStack
         return count - remainingCount;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/LZMA/LZipStream.cs

@@ -163,7 +163,7 @@ public sealed class LZipStream : Stream, IStreamStack
 
     public override void SetLength(long value) => throw new NotImplementedException();
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
 
     public override ValueTask<int> ReadAsync(
         Memory<byte> buffer,

src/SharpCompress/Compressors/LZMA/LzmaDecoder.cs

@@ -201,7 +201,7 @@ public class Decoder : ICoder, ISetDecoderProperties // ,System.IO.Stream
         }
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     [MemberNotNull(nameof(_outWindow))]
 #endif
     private void CreateDictionary()

src/SharpCompress/Compressors/LZMA/LzmaStream.cs

@@ -632,7 +632,7 @@ public class LzmaStream : Stream, IStreamStack
         return total;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs

@@ -185,7 +185,7 @@ internal sealed class MultiVolumeReadOnlyStream : Stream, IStreamStack
         return totalRead;
     }
 
-#if !LEGACY_DOTNET
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Rar/RarBLAKE2spStream.cs

@@ -385,7 +385,7 @@ internal class RarBLAKE2spStream : RarStream, IStreamStack
         return result;
     }
 
-#if !LEGACY_DOTNET
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Rar/RarCrcStream.cs

@@ -129,7 +129,7 @@ internal class RarCrcStream : RarStream, IStreamStack
         return result;
     }
 
-#if !LEGACY_DOTNET
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Rar/RarStream.cs

@@ -87,10 +87,10 @@ internal class RarStream : Stream, IStreamStack
 #endif
                 ArrayPool<byte>.Shared.Return(this.tmpBuffer);
                 this.tmpBuffer = null;
-                readStream.Dispose();
             }
             isDisposed = true;
             base.Dispose(disposing);
+            readStream.Dispose();
         }
     }
 
@@ -189,7 +189,7 @@ internal class RarStream : Stream, IStreamStack
         return outTotal;
     }
 
-#if !LEGACY_DOTNET
+#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default

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

@@ -126,12 +126,17 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
 
     private FileHeader fileHeader;
 
-    private void Init()
+    private void Init(byte[] window)
     {
-        if (this.window is null)
+        if (this.window is null && window is null)
         {
             this.window = ArrayPool<byte>.Shared.Rent(PackDef.MAXWINSIZE);
         }
+        else if (window is not null)
+        {
+            this.window = window;
+            externalWindow = true;
+        }
         inAddr = 0;
         UnpInitData(false);
     }
@@ -144,7 +149,7 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         this.writeStream = writeStream;
         if (!fileHeader.IsSolid)
         {
-            Init();
+            Init(null);
         }
         suspended = false;
         DoUnpack();
@@ -163,7 +168,7 @@ internal sealed partial class Unpack : BitInput, IRarUnpack
         this.writeStream = writeStream;
         if (!fileHeader.IsSolid)
         {
-            Init();
+            Init(null);
         }
         suspended = false;
         await DoUnpackAsync(cancellationToken).ConfigureAwait(false);

src/SharpCompress/Compressors/ZStandard/CompressionStream.cs

@@ -74,7 +74,7 @@ public class CompressionStream : Stream
 
     ~CompressionStream() => Dispose(false);
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
     public override async ValueTask DisposeAsync()
 #else
     public async ValueTask DisposeAsync()
@@ -145,7 +145,7 @@ public class CompressionStream : Stream
     public override void Write(byte[] buffer, int offset, int count) =>
         Write(new ReadOnlySpan<byte>(buffer, offset, count));
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
     public override void Write(ReadOnlySpan<byte> buffer) =>
         WriteInternal(buffer, ZSTD_EndDirective.ZSTD_e_continue);
 #else
@@ -176,7 +176,7 @@ public class CompressionStream : Stream
         );
     }
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
     private async ValueTask WriteInternalAsync(
         ReadOnlyMemory<byte>? buffer,
         ZSTD_EndDirective directive,
@@ -218,7 +218,7 @@ public class CompressionStream : Stream
         );
     }
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
 
     public override Task WriteAsync(
         byte[] buffer,

src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs

@@ -105,7 +105,7 @@ public class DecompressionStream : Stream
     public override int Read(byte[] buffer, int offset, int count) =>
         Read(new Span<byte>(buffer, offset, count));
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
     public override int Read(Span<byte> buffer)
 #else
     public int Read(Span<byte> buffer)
@@ -158,7 +158,7 @@ public class DecompressionStream : Stream
         }
     }
 
-#if !LEGACY_DOTNET
+#if !NETSTANDARD2_0 && !NETFRAMEWORK
     public override Task<int> ReadAsync(
         byte[] buffer,
         int offset,
@@ -276,7 +276,7 @@ public class DecompressionStream : Stream
             throw new ObjectDisposedException(nameof(DecompressionStream));
     }
 
-#if LEGACY_DOTNET
+#if NETSTANDARD2_0 || NETFRAMEWORK
     public virtual Task DisposeAsync()
     {
         try

src/SharpCompress/Compressors/ZStandard/UnsafeHelper.cs

@@ -16,7 +16,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void* malloc(ulong size)
     {
-#if NET8_0_OR_GREATER
+#if NET6_0_OR_GREATER
         var ptr = NativeMemory.Alloc((nuint)size);
 #else
         var ptr = (void*)Marshal.AllocHGlobal((nint)size);
@@ -31,7 +31,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void* calloc(ulong num, ulong size)
     {
-#if NET8_0_OR_GREATER
+#if NET6_0_OR_GREATER
         return NativeMemory.AllocZeroed((nuint)num, (nuint)size);
 #else
         var total = num * size;
@@ -53,7 +53,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void free(void* ptr)
     {
-#if NET8_0_OR_GREATER
+#if NET6_0_OR_GREATER
         NativeMemory.Free(ptr);
 #else
         Marshal.FreeHGlobal((IntPtr)ptr);

src/SharpCompress/Crypto/Crc32Stream.cs

@@ -70,7 +70,7 @@ public sealed class Crc32Stream : Stream, IStreamStack
 
     public override void SetLength(long value) => throw new NotSupportedException();
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
 
     public override void Write(ReadOnlySpan<byte> buffer)
     {

src/SharpCompress/Factories/AceFactory.cs

@@ -30,17 +30,13 @@ namespace SharpCompress.Factories
         ) => AceHeader.IsArchive(stream);
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-            AceReader.OpenReader(stream, options);
+            AceReader.Open(stream, options);
 
-        public IAsyncReader OpenAsyncReader(
+        public ValueTask<IAsyncReader> OpenReaderAsync(
             Stream stream,
             ReaderOptions? options,
             CancellationToken cancellationToken = default
-        )
-        {
-            cancellationToken.ThrowIfCancellationRequested();
-            return (IAsyncReader)AceReader.OpenReader(stream, options);
-        }
+        ) => new(AceReader.Open(stream, options));
 
         public override ValueTask<bool> IsArchiveAsync(
             Stream stream,

src/SharpCompress/Factories/ArcFactory.cs

@@ -42,17 +42,13 @@ namespace SharpCompress.Factories
         }
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-            ArcReader.OpenReader(stream, options);
+            ArcReader.Open(stream, options);
 
-        public IAsyncReader OpenAsyncReader(
+        public ValueTask<IAsyncReader> OpenReaderAsync(
             Stream stream,
             ReaderOptions? options,
             CancellationToken cancellationToken = default
-        )
-        {
-            cancellationToken.ThrowIfCancellationRequested();
-            return (IAsyncReader)ArcReader.OpenReader(stream, options);
-        }
+        ) => new(ArcReader.Open(stream, options));
 
         public override ValueTask<bool> IsArchiveAsync(
             Stream stream,

src/SharpCompress/Factories/ArjFactory.cs

@@ -33,17 +33,13 @@ namespace SharpCompress.Factories
         }
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-            ArjReader.OpenReader(stream, options);
+            ArjReader.Open(stream, options);
 
-        public IAsyncReader OpenAsyncReader(
+        public ValueTask<IAsyncReader> OpenReaderAsync(
             Stream stream,
             ReaderOptions? options,
             CancellationToken cancellationToken = default
-        )
-        {
-            cancellationToken.ThrowIfCancellationRequested();
-            return (IAsyncReader)ArjReader.OpenReader(stream, options);
-        }
+        ) => new(ArjReader.Open(stream, options));
 
         public override ValueTask<bool> IsArchiveAsync(
             Stream stream,

src/SharpCompress/Factories/Factory.cs

@@ -133,7 +133,10 @@ public abstract class Factory : IFactory
             )
             {
                 ((IStreamStack)stream).StackSeek(pos);
-                return (true, readerFactory.OpenAsyncReader(stream, options, cancellationToken));
+                return (
+                    true,
+                    await readerFactory.OpenReaderAsync(stream, options, cancellationToken)
+                );
             }
         }
 

src/SharpCompress/Factories/GZipFactory.cs

@@ -61,12 +61,15 @@ public class GZipFactory
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        GZipArchive.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        GZipArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
 
     public override ValueTask<bool> IsArchiveAsync(
         Stream stream,
@@ -75,48 +78,41 @@ public class GZipFactory
     ) => new(IsArchive(stream, password, bufferSize));
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        GZipArchive.Open(fileInfo, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => GZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
 
     #endregion
 
     #region IMultiArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
+    public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
+        GZipArchive.Open(streams, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => GZipArchive.OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
+    public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
+        GZipArchive.Open(fileInfos, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => GZipArchive.OpenArchive(fileInfos, readerOptions);
-
-    /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
+    ) => GZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
 
     #endregion
 
@@ -154,29 +150,25 @@ public class GZipFactory
 
     /// <inheritdoc/>
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-        GZipReader.OpenReader(stream, options);
+        GZipReader.Open(stream, options);
 
     /// <inheritdoc/>
-    public IAsyncReader OpenAsyncReader(
+    public ValueTask<IAsyncReader> OpenReaderAsync(
         Stream stream,
         ReaderOptions? options,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncReader)GZipReader.OpenReader(stream, options);
+        return new(GZipReader.Open(stream, options));
     }
 
-    /// <inheritdoc/>
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        GZipArchive.OpenArchive(fileInfo, readerOptions);
-
     #endregion
 
     #region IWriterFactory
 
     /// <inheritdoc/>
-    public IWriter OpenWriter(Stream stream, WriterOptions writerOptions)
+    public IWriter Open(Stream stream, WriterOptions writerOptions)
     {
         if (writerOptions.CompressionType != CompressionType.GZip)
         {
@@ -186,18 +178,14 @@ public class GZipFactory
     }
 
     /// <inheritdoc/>
-    public IAsyncWriter OpenAsyncWriter(
+    public ValueTask<IWriter> OpenAsync(
         Stream stream,
         WriterOptions writerOptions,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        if (writerOptions.CompressionType != CompressionType.GZip)
-        {
-            throw new InvalidFormatException("GZip archives only support GZip compression type.");
-        }
-        return (IAsyncWriter)OpenWriter(stream, writerOptions);
+        return new(Open(stream, writerOptions));
     }
 
     #endregion
@@ -205,7 +193,7 @@ public class GZipFactory
     #region IWriteableArchiveFactory
 
     /// <inheritdoc/>
-    public IWritableArchive CreateArchive() => GZipArchive.CreateArchive();
+    public IWritableArchive CreateWriteableArchive() => GZipArchive.Create();
 
     #endregion
 }

src/SharpCompress/Factories/RarFactory.cs

@@ -46,27 +46,26 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        RarArchive.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        RarArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(stream, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        RarArchive.OpenArchive(fileInfo, readerOptions);
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        RarArchive.Open(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => RarArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
 
     public override ValueTask<bool> IsArchiveAsync(
         Stream stream,
@@ -79,33 +78,26 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     #region IMultiArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
+    public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
+        RarArchive.Open(streams, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => RarArchive.OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(streams, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
+    public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
+        RarArchive.Open(fileInfos, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => RarArchive.OpenArchive(fileInfos, readerOptions);
-
-    /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
+    ) => RarArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
 
     #endregion
 
@@ -113,17 +105,17 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
 
     /// <inheritdoc/>
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-        RarReader.OpenReader(stream, options);
+        RarReader.Open(stream, options);
 
     /// <inheritdoc/>
-    public IAsyncReader OpenAsyncReader(
+    public ValueTask<IAsyncReader> OpenReaderAsync(
         Stream stream,
         ReaderOptions? options,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncReader)RarReader.OpenReader(stream, options);
+        return new(RarReader.Open(stream, options));
     }
 
     #endregion

src/SharpCompress/Factories/SevenZipFactory.cs

@@ -41,27 +41,26 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        SevenZipArchive.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        SevenZipArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        SevenZipArchive.OpenArchive(fileInfo, readerOptions);
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        SevenZipArchive.Open(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => SevenZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
 
     public override ValueTask<bool> IsArchiveAsync(
         Stream stream,
@@ -74,33 +73,26 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     #region IMultiArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
+    public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
+        SevenZipArchive.Open(streams, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => SevenZipArchive.OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
+    public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
+        SevenZipArchive.Open(fileInfos, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => SevenZipArchive.OpenArchive(fileInfos, readerOptions);
-
-    /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
+    ) => SevenZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
 
     #endregion
 

src/SharpCompress/Factories/TarFactory.cs

@@ -72,60 +72,52 @@ public class TarFactory
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        TarArchive.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(stream, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        TarArchive.OpenArchive(fileInfo, readerOptions);
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => TarArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
 
     #endregion
 
     #region IMultiArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
+    public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(streams, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => TarArchive.OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(streams, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
+    public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(fileInfos, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => TarArchive.OpenArchive(fileInfos, readerOptions);
-
-    /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
+    ) => TarArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
 
     #endregion
 
@@ -276,17 +268,17 @@ public class TarFactory
 
     /// <inheritdoc/>
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-        TarReader.OpenReader(stream, options);
+        TarReader.Open(stream, options);
 
     /// <inheritdoc/>
-    public IAsyncReader OpenAsyncReader(
+    public ValueTask<IAsyncReader> OpenReaderAsync(
         Stream stream,
         ReaderOptions? options,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncReader)TarReader.OpenReader(stream, options);
+        return new(TarReader.Open(stream, options));
     }
 
     #endregion
@@ -294,18 +286,18 @@ public class TarFactory
     #region IWriterFactory
 
     /// <inheritdoc/>
-    public IWriter OpenWriter(Stream stream, WriterOptions writerOptions) =>
+    public IWriter Open(Stream stream, WriterOptions writerOptions) =>
         new TarWriter(stream, new TarWriterOptions(writerOptions));
 
     /// <inheritdoc/>
-    public IAsyncWriter OpenAsyncWriter(
+    public ValueTask<IWriter> OpenAsync(
         Stream stream,
         WriterOptions writerOptions,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncWriter)OpenWriter(stream, writerOptions);
+        return new(Open(stream, writerOptions));
     }
 
     #endregion
@@ -313,7 +305,7 @@ public class TarFactory
     #region IWriteableArchiveFactory
 
     /// <inheritdoc/>
-    public IWritableArchive CreateArchive() => TarArchive.CreateArchive();
+    public IWritableArchive CreateWriteableArchive() => TarArchive.Create();
 
     #endregion
 }

src/SharpCompress/Factories/ZipFactory.cs

@@ -139,60 +139,52 @@ public class ZipFactory
     #region IArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        ZipArchive.OpenArchive(stream, readerOptions);
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        ZipArchive.Open(stream, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(Stream stream, ReaderOptions? readerOptions = null) =>
-        (IAsyncArchive)OpenArchive(stream, readerOptions);
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
-        ZipArchive.OpenArchive(fileInfo, readerOptions);
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        ZipArchive.Open(fileInfo, readerOptions);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfo, readerOptions);
-    }
+    ) => ZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
 
     #endregion
 
     #region IMultiArchiveFactory
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
+    public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
+        ZipArchive.Open(streams, readerOptions);
+
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => ZipArchive.OpenArchive(streams, readerOptions);
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
 
     /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
-        IReadOnlyList<Stream> streams,
-        ReaderOptions? readerOptions = null
-    ) => (IAsyncArchive)OpenArchive(streams, readerOptions);
+    public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
+        ZipArchive.Open(fileInfos, readerOptions);
 
     /// <inheritdoc/>
-    public IArchive OpenArchive(
-        IReadOnlyList<FileInfo> fileInfos,
-        ReaderOptions? readerOptions = null
-    ) => ZipArchive.OpenArchive(fileInfos, readerOptions);
-
-    /// <inheritdoc/>
-    public IAsyncArchive OpenAsyncArchive(
+    public ValueTask<IAsyncArchive> OpenAsync(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
-    )
-    {
-        cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncArchive)OpenArchive(fileInfos, readerOptions);
-    }
+    ) => ZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
 
     #endregion
 
@@ -200,17 +192,17 @@ public class ZipFactory
 
     /// <inheritdoc/>
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
-        ZipReader.OpenReader(stream, options);
+        ZipReader.Open(stream, options);
 
     /// <inheritdoc/>
-    public IAsyncReader OpenAsyncReader(
+    public ValueTask<IAsyncReader> OpenReaderAsync(
         Stream stream,
         ReaderOptions? options,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncReader)ZipReader.OpenReader(stream, options);
+        return new(ZipReader.Open(stream, options));
     }
 
     #endregion
@@ -218,18 +210,18 @@ public class ZipFactory
     #region IWriterFactory
 
     /// <inheritdoc/>
-    public IWriter OpenWriter(Stream stream, WriterOptions writerOptions) =>
+    public IWriter Open(Stream stream, WriterOptions writerOptions) =>
         new ZipWriter(stream, new ZipWriterOptions(writerOptions));
 
     /// <inheritdoc/>
-    public IAsyncWriter OpenAsyncWriter(
+    public ValueTask<IWriter> OpenAsync(
         Stream stream,
         WriterOptions writerOptions,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return (IAsyncWriter)OpenWriter(stream, writerOptions);
+        return new(Open(stream, writerOptions));
     }
 
     #endregion
@@ -237,7 +229,7 @@ public class ZipFactory
     #region IWriteableArchiveFactory
 
     /// <inheritdoc/>
-    public IWritableArchive CreateArchive() => ZipArchive.CreateArchive();
+    public IWritableArchive CreateWriteableArchive() => ZipArchive.Create();
 
     #endregion
 }

src/SharpCompress/IO/BufferedSubStream.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Buffers;
 using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
@@ -29,16 +28,13 @@ internal class BufferedSubStream : SharpCompressStream, IStreamStack
 #if DEBUG_STREAMS
         this.DebugDispose(typeof(BufferedSubStream));
 #endif
-        if (disposing)
-        {
-            ArrayPool<byte>.Shared.Return(_cache);
-        }
+        if (disposing) { }
         base.Dispose(disposing);
     }
 
     private int _cacheOffset;
     private int _cacheLength;
-    private readonly byte[] _cache = ArrayPool<byte>.Shared.Rent(32 << 10);
+    private readonly byte[] _cache = new byte[32 << 10];
     private long origin;
 
     private long BytesLeftToRead { get; set; }
@@ -154,7 +150,7 @@ internal class BufferedSubStream : SharpCompressStream, IStreamStack
         return count;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/IO/ProgressReportingStream.cs

@@ -64,7 +64,7 @@ internal sealed class ProgressReportingStream : Stream
         return bytesRead;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override int Read(Span<byte> buffer)
     {
         var bytesRead = _baseStream.Read(buffer);
@@ -95,7 +95,7 @@ internal sealed class ProgressReportingStream : Stream
         return bytesRead;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -147,7 +147,7 @@ internal sealed class ProgressReportingStream : Stream
         base.Dispose(disposing);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask DisposeAsync()
     {
         if (!_leaveOpen)

src/SharpCompress/IO/ReadOnlySubStream.cs

@@ -81,7 +81,7 @@ internal class ReadOnlySubStream : SharpCompressStream, IStreamStack
         return value;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override int Read(Span<byte> buffer)
     {
         var sliceLen = BytesLeftToRead < buffer.Length ? BytesLeftToRead : buffer.Length;
@@ -117,7 +117,7 @@ internal class ReadOnlySubStream : SharpCompressStream, IStreamStack
         return read;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default

src/SharpCompress/IO/SharpCompressStream.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Buffers;
+using System.Diagnostics;
 using System.IO;
+using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -384,7 +386,7 @@ public class SharpCompressStream : Stream, IStreamStack
         await Stream.FlushAsync(cancellationToken).ConfigureAwait(false);
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
 
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,

src/SharpCompress/IO/SourceStream.cs

@@ -98,30 +98,6 @@ public class SourceStream : Stream, IStreamStack
 
     private Stream Current => _streams[_stream];
 
-    /// <summary>
-    /// Creates an independent stream for the specified volume index.
-    /// This allows multiple threads to read from different positions concurrently.
-    /// Only works when IsFileMode is true.
-    /// </summary>
-    /// <param name="volumeIndex">The volume index to create a stream for</param>
-    /// <returns>A new independent FileStream, or null if not in file mode or volume doesn't exist</returns>
-    public Stream? CreateIndependentStream(int volumeIndex)
-    {
-        if (!IsFileMode)
-        {
-            return null;
-        }
-
-        // Ensure the volume is loaded
-        if (!LoadStream(volumeIndex))
-        {
-            return null;
-        }
-
-        // Create a new independent stream from the FileInfo
-        return _files[volumeIndex].OpenRead();
-    }
-
     public bool LoadStream(int index) //ensure all parts to id are loaded
     {
         while (_streams.Count <= index)
@@ -313,7 +289,7 @@ public class SourceStream : Stream, IStreamStack
         return total - count;
     }
 
-#if !LEGACY_DOTNET
+#if !NETFRAMEWORK && !NETSTANDARD2_0
 
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,

src/SharpCompress/LazyAsyncReadOnlyCollection.cs

@@ -10,23 +10,23 @@ namespace SharpCompress;
 internal sealed class LazyAsyncReadOnlyCollection<T>(IAsyncEnumerable<T> source)
     : IAsyncEnumerable<T>
 {
-    private readonly List<T> _backing = new();
-    private readonly IAsyncEnumerator<T> _source = source.GetAsyncEnumerator();
-    private bool _fullyLoaded;
+    private readonly List<T> backing = new();
+    private readonly IAsyncEnumerator<T> source = source.GetAsyncEnumerator();
+    private bool fullyLoaded;
 
     private class LazyLoader(
         LazyAsyncReadOnlyCollection<T> lazyReadOnlyCollection,
         CancellationToken cancellationToken
     ) : IAsyncEnumerator<T>
     {
-        private bool _disposed;
-        private int _index = -1;
+        private bool disposed;
+        private int index = -1;
 
         public ValueTask DisposeAsync()
         {
-            if (!_disposed)
+            if (!disposed)
             {
-                _disposed = true;
+                disposed = true;
             }
             return default;
         }
@@ -34,27 +34,27 @@ internal sealed class LazyAsyncReadOnlyCollection<T>(IAsyncEnumerable<T> source)
         public async ValueTask<bool> MoveNextAsync()
         {
             cancellationToken.ThrowIfCancellationRequested();
-            if (_index + 1 < lazyReadOnlyCollection._backing.Count)
+            if (index + 1 < lazyReadOnlyCollection.backing.Count)
             {
-                _index++;
+                index++;
                 return true;
             }
             if (
-                !lazyReadOnlyCollection._fullyLoaded
-                && await lazyReadOnlyCollection._source.MoveNextAsync()
+                !lazyReadOnlyCollection.fullyLoaded
+                && await lazyReadOnlyCollection.source.MoveNextAsync()
             )
             {
-                lazyReadOnlyCollection._backing.Add(lazyReadOnlyCollection._source.Current);
-                _index++;
+                lazyReadOnlyCollection.backing.Add(lazyReadOnlyCollection.source.Current);
+                index++;
                 return true;
             }
-            lazyReadOnlyCollection._fullyLoaded = true;
+            lazyReadOnlyCollection.fullyLoaded = true;
             return false;
         }
 
         #region IEnumerator<T> Members
 
-        public T Current => lazyReadOnlyCollection._backing[_index];
+        public T Current => lazyReadOnlyCollection.backing[index];
 
         #endregion
 
@@ -62,9 +62,9 @@ internal sealed class LazyAsyncReadOnlyCollection<T>(IAsyncEnumerable<T> source)
 
         public void Dispose()
         {
-            if (!_disposed)
+            if (!disposed)
             {
-                _disposed = true;
+                disposed = true;
             }
         }
 
@@ -73,18 +73,18 @@ internal sealed class LazyAsyncReadOnlyCollection<T>(IAsyncEnumerable<T> source)
 
     internal async ValueTask EnsureFullyLoaded()
     {
-        if (!_fullyLoaded)
+        if (!fullyLoaded)
         {
             var loader = new LazyLoader(this, CancellationToken.None);
             while (await loader.MoveNextAsync())
             {
                 // Intentionally empty
             }
-            _fullyLoaded = true;
+            fullyLoaded = true;
         }
     }
 
-    internal IEnumerable<T> GetLoaded() => _backing;
+    internal IEnumerable<T> GetLoaded() => backing;
 
     #region ICollection<T> Members
 

src/SharpCompress/LazyReadOnlyCollection.cs

@@ -8,24 +8,24 @@ namespace SharpCompress;
 
 internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
 {
-    private readonly List<T> _backing = new();
-    private readonly IEnumerator<T> _source;
-    private bool _fullyLoaded;
+    private readonly List<T> backing = new();
+    private readonly IEnumerator<T> source;
+    private bool fullyLoaded;
 
-    public LazyReadOnlyCollection(IEnumerable<T> source) => _source = source.GetEnumerator();
+    public LazyReadOnlyCollection(IEnumerable<T> source) => this.source = source.GetEnumerator();
 
     private class LazyLoader : IEnumerator<T>
     {
-        private readonly LazyReadOnlyCollection<T> _lazyReadOnlyCollection;
-        private bool _disposed;
-        private int _index = -1;
+        private readonly LazyReadOnlyCollection<T> lazyReadOnlyCollection;
+        private bool disposed;
+        private int index = -1;
 
         internal LazyLoader(LazyReadOnlyCollection<T> lazyReadOnlyCollection) =>
-            _lazyReadOnlyCollection = lazyReadOnlyCollection;
+            this.lazyReadOnlyCollection = lazyReadOnlyCollection;
 
         #region IEnumerator<T> Members
 
-        public T Current => _lazyReadOnlyCollection._backing[_index];
+        public T Current => lazyReadOnlyCollection.backing[index];
 
         #endregion
 
@@ -33,9 +33,9 @@ internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
 
         public void Dispose()
         {
-            if (!_disposed)
+            if (!disposed)
             {
-                _disposed = true;
+                disposed = true;
             }
         }
 
@@ -47,18 +47,18 @@ internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
 
         public bool MoveNext()
         {
-            if (_index + 1 < _lazyReadOnlyCollection._backing.Count)
+            if (index + 1 < lazyReadOnlyCollection.backing.Count)
             {
-                _index++;
+                index++;
                 return true;
             }
-            if (!_lazyReadOnlyCollection._fullyLoaded && _lazyReadOnlyCollection._source.MoveNext())
+            if (!lazyReadOnlyCollection.fullyLoaded && lazyReadOnlyCollection.source.MoveNext())
             {
-                _lazyReadOnlyCollection._backing.Add(_lazyReadOnlyCollection._source.Current);
-                _index++;
+                lazyReadOnlyCollection.backing.Add(lazyReadOnlyCollection.source.Current);
+                index++;
                 return true;
             }
-            _lazyReadOnlyCollection._fullyLoaded = true;
+            lazyReadOnlyCollection.fullyLoaded = true;
             return false;
         }
 
@@ -69,14 +69,14 @@ internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
 
     internal void EnsureFullyLoaded()
     {
-        if (!_fullyLoaded)
+        if (!fullyLoaded)
         {
             this.ForEach(x => { });
-            _fullyLoaded = true;
+            fullyLoaded = true;
         }
     }
 
-    internal IEnumerable<T> GetLoaded() => _backing;
+    internal IEnumerable<T> GetLoaded() => backing;
 
     #region ICollection<T> Members
 
@@ -87,13 +87,13 @@ internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
     public bool Contains(T item)
     {
         EnsureFullyLoaded();
-        return _backing.Contains(item);
+        return backing.Contains(item);
     }
 
     public void CopyTo(T[] array, int arrayIndex)
     {
         EnsureFullyLoaded();
-        _backing.CopyTo(array, arrayIndex);
+        backing.CopyTo(array, arrayIndex);
     }
 
     public int Count
@@ -101,7 +101,7 @@ internal sealed class LazyReadOnlyCollection<T> : ICollection<T>
         get
         {
             EnsureFullyLoaded();
-            return _backing.Count;
+            return backing.Count;
         }
     }
 

src/SharpCompress/NotNullExtensions.cs

@@ -21,7 +21,7 @@ internal static class NotNullExtensions
         return source.AsEnumerable();
     }
 
-#if LEGACY_DOTNET
+#if NETFRAMEWORK || NETSTANDARD
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static T NotNull<T>(this T? obj, string? message = null)
         where T : class

src/SharpCompress/Polyfills/AsyncEnumerableExtensions.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Threading;
 using System.Threading.Tasks;
 
 namespace SharpCompress;
@@ -31,46 +29,9 @@ public static class EnumerableExtensions
 
 public static class AsyncEnumerableExtensions
 {
-#if !NET10_0_OR_GREATER
     extension<T>(IAsyncEnumerable<T> source)
+        where T : notnull
     {
-        public async IAsyncEnumerable<TResult> Select<TResult>(Func<T, TResult> selector)
-        {
-            await foreach (var element in source)
-            {
-                yield return selector(element);
-            }
-        }
-
-        public async ValueTask<int> CountAsync(CancellationToken cancellationToken = default)
-        {
-            await using var e = source.GetAsyncEnumerator(cancellationToken);
-
-            var count = 0;
-            while (await e.MoveNextAsync())
-            {
-                checked
-                {
-                    count++;
-                }
-            }
-
-            return count;
-        }
-
-        public async IAsyncEnumerable<T> Take(int count)
-        {
-            await foreach (var element in source)
-            {
-                yield return element;
-
-                if (--count == 0)
-                {
-                    break;
-                }
-            }
-        }
-
         public async ValueTask<List<T>> ToListAsync()
         {
             var list = new List<T>();
@@ -81,7 +42,16 @@ public static class AsyncEnumerableExtensions
             return list;
         }
 
-        public async ValueTask<bool> AllAsync(Func<T, bool> predicate)
+        public async IAsyncEnumerable<TResult> Cast<TResult>()
+            where TResult : class
+        {
+            await foreach (var item in source)
+            {
+                yield return (item as TResult).NotNull();
+            }
+        }
+
+        public async ValueTask<bool> All(Func<T, bool> predicate)
         {
             await foreach (var item in source)
             {
@@ -105,77 +75,27 @@ public static class AsyncEnumerableExtensions
             }
         }
 
-        public async ValueTask<T> SingleAsync(Func<T, bool>? predicate = null)
-        {
-            IAsyncEnumerator<T> enumerator;
-            if (predicate is null)
-            {
-                enumerator = source.GetAsyncEnumerator();
-            }
-            else
-            {
-                enumerator = source.Where(predicate).GetAsyncEnumerator();
-            }
-
-            if (!await enumerator.MoveNextAsync())
-            {
-                throw new InvalidOperationException("The source sequence is empty.");
-            }
-            var value = enumerator.Current;
-            if (await enumerator.MoveNextAsync())
-            {
-                throw new InvalidOperationException(
-                    "The source sequence contains more than one element."
-                );
-            }
-            return value;
-        }
-
-        public async ValueTask<T> FirstAsync()
+        public async ValueTask<T?> FirstOrDefaultAsync()
         {
             await foreach (var item in source)
             {
-                return item;
+                return item; // Returns the very first item found
             }
-            throw new InvalidOperationException("The source sequence is empty.");
+
+            return default; // Returns null/default if the stream is empty
         }
 
-        public async ValueTask<T?> FirstOrDefaultAsync(
-            CancellationToken cancellationToken = default
+        public async ValueTask<TAccumulate> Aggregate<TAccumulate>(
+            TAccumulate seed,
+            Func<TAccumulate, T, TAccumulate> func
         )
         {
-            await foreach (var item in source.WithCancellation(cancellationToken))
+            TAccumulate result = seed;
+            await foreach (var element in source)
             {
-                return item;
+                result = func(result, element);
             }
-
-            return default;
+            return result;
         }
     }
-#endif
-
-    public static async IAsyncEnumerable<TResult> CastAsync<TResult>(
-        this IAsyncEnumerable<object?> source
-    )
-        where TResult : class
-    {
-        await foreach (var item in source)
-        {
-            yield return (item as TResult).NotNull();
-        }
-    }
-
-    public static async ValueTask<TAccumulate> AggregateAsync<TAccumulate, T>(
-        this IAsyncEnumerable<T> source,
-        TAccumulate seed,
-        Func<TAccumulate, T, TAccumulate> func
-    )
-    {
-        var result = seed;
-        await foreach (var element in source)
-        {
-            result = func(result, element);
-        }
-        return result;
-    }
 }

src/SharpCompress/Polyfills/StreamExtensions.cs

@@ -27,11 +27,7 @@ public static class StreamExtensions
         public Task SkipAsync(CancellationToken cancellationToken = default)
         {
             cancellationToken.ThrowIfCancellationRequested();
-#if NET8_0_OR_GREATER
-            return stream.CopyToAsync(Stream.Null, cancellationToken);
-#else
             return stream.CopyToAsync(Stream.Null);
-#endif
         }
 
         internal int Read(Span<byte> buffer)

src/SharpCompress/Polyfills/StringExtensions.cs

@@ -1,4 +1,4 @@
-#if LEGACY_DOTNET
+#if NETFRAMEWORK || NETSTANDARD2_0
 
 namespace SharpCompress;
 

src/SharpCompress/Readers/AbstractReader.cs

@@ -277,7 +277,7 @@ public abstract class AbstractReader<TEntry, TVolume> : IReader, IAsyncReader
             }
         }
         //don't know the size so we have to try to decompress to skip
-#if LEGACY_DOTNET
+#if NETFRAMEWORK || NETSTANDARD2_0
         using var s = await OpenEntryStreamAsync(cancellationToken).ConfigureAwait(false);
         await s.SkipEntryAsync(cancellationToken).ConfigureAwait(false);
 #else
@@ -344,7 +344,7 @@ public abstract class AbstractReader<TEntry, TVolume> : IReader, IAsyncReader
 
     internal async ValueTask WriteAsync(Stream writeStream, CancellationToken cancellationToken)
     {
-#if LEGACY_DOTNET
+#if NETFRAMEWORK || NETSTANDARD2_0
         using Stream s = await OpenEntryStreamAsync(cancellationToken).ConfigureAwait(false);
         var sourceStream = WrapWithProgress(s, Entry);
         await sourceStream.CopyToAsync(writeStream, 81920, cancellationToken).ConfigureAwait(false);