fmt

first pass of making Rar multi-threaded
add SupportsMultiThreading and IsMultiVolume to archive
2026-02-06 21:26:07 +00:00 · 2025-11-27 15:50:25 +00:00 · 2025-11-27 15:49:29 +00:00 · 2025-11-27 15:07:13 +00:00 · 2025-11-27 12:22:49 +00:00 · 2025-11-27 12:14:35 +00:00
53 changed files with 451 additions and 1102 deletions
--- a/.github/workflows/dotnetcore.yml
+++ b/.github/workflows/dotnetcore.yml
@@ -17,7 +17,7 @@ jobs:
    - uses: actions/checkout@v6
    - uses: actions/setup-dotnet@v5
      with:
-        dotnet-version: 10.0.x
+        dotnet-version: 8.0.x
    - run: dotnet run --project build/build.csproj
    - uses: actions/upload-artifact@v5
      with:
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@ tests/TestArchives/*/Scratch
 tests/TestArchives/*/Scratch2
 .vs
 tools
+.vscode
 .idea/

 .DS_Store
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,9 +0,0 @@
-{
-  "recommendations": [
-    "ms-dotnettools.csdevkit",
-    "ms-dotnettools.csharp",
-    "ms-dotnettools.vscode-dotnet-runtime",
-    "csharpier.csharpier-vscode",
-    "formulahendry.dotnet-test-explorer"
-  ]
-}
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -1,97 +0,0 @@
-{
-  "version": "0.2.0",
-  "configurations": [
-    {
-      "name": "Debug Tests (net10.0)",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Specific Test (net10.0)",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--filter",
-        "FullyQualifiedName~${input:testName}"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Performance Tests",
-      "type": "coreclr",
-      "request": "launch",
-      "preLaunchTask": "build",
-      "program": "dotnet",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/tests/SharpCompress.Performance/SharpCompress.Performance.csproj",
-        "--no-build"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    },
-    {
-      "name": "Debug Build Script",
-      "type": "coreclr",
-      "request": "launch",
-      "program": "dotnet",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/build/build.csproj",
-        "--",
-        "${input:buildTarget}"
-      ],
-      "cwd": "${workspaceFolder}",
-      "console": "internalConsole",
-      "stopAtEntry": false
-    }
-  ],
-  "inputs": [
-    {
-      "id": "testName",
-      "type": "promptString",
-      "description": "Enter test name or pattern (e.g., TestMethodName or ClassName)",
-      "default": ""
-    },
-    {
-      "id": "buildTarget",
-      "type": "pickString",
-      "description": "Select build target",
-      "options": [
-        "clean",
-        "restore",
-        "build",
-        "test",
-        "format",
-        "publish",
-        "default"
-      ],
-      "default": "build"
-    }
-  ]
-}
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,29 +0,0 @@
-{
-  "dotnet.defaultSolution": "SharpCompress.sln",
-  "files.exclude": {
-    "**/bin": true,
-    "**/obj": true
-  },
-  "files.watcherExclude": {
-    "**/bin/**": true,
-    "**/obj/**": true,
-    "**/artifacts/**": true
-  },
-  "search.exclude": {
-    "**/bin": true,
-    "**/obj": true,
-    "**/artifacts": true
-  },
-  "editor.formatOnSave": false,
-  "[csharp]": {
-    "editor.defaultFormatter": "csharpier.csharpier-vscode",
-    "editor.formatOnSave": true,
-    "editor.codeActionsOnSave": {
-      "source.fixAll": "explicit"
-    }
-  },
-  "csharpier.enableDebugLogs": false,
-  "omnisharp.enableRoslynAnalyzers": true,
-  "omnisharp.enableEditorConfigSupport": true,
-  "dotnet-test-explorer.testProjectPath": "tests/**/*.csproj"
-}
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -1,178 +0,0 @@
-{
-  "version": "2.0.0",
-  "tasks": [
-    {
-      "label": "build",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/SharpCompress.sln",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": {
-        "kind": "build",
-        "isDefault": true
-      }
-    },
-    {
-      "label": "build-release",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/SharpCompress.sln",
-        "-c",
-        "Release",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "build"
-    },
-    {
-      "label": "build-library",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "build",
-        "${workspaceFolder}/src/SharpCompress/SharpCompress.csproj",
-        "/property:GenerateFullPaths=true",
-        "/consoleloggerparameters:NoSummary;ForceNoAlign"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "build"
-    },
-    {
-      "label": "restore",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "restore",
-        "${workspaceFolder}/SharpCompress.sln"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "clean",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "clean",
-        "${workspaceFolder}/SharpCompress.sln"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "test",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": {
-        "kind": "test",
-        "isDefault": true
-      },
-      "dependsOn": "build"
-    },
-    {
-      "label": "test-net10",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net10.0",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "test",
-      "dependsOn": "build"
-    },
-    {
-      "label": "test-net48",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "test",
-        "${workspaceFolder}/tests/SharpCompress.Test/SharpCompress.Test.csproj",
-        "-f",
-        "net48",
-        "--no-build",
-        "--verbosity=normal"
-      ],
-      "problemMatcher": "$msCompile",
-      "group": "test",
-      "dependsOn": "build"
-    },
-    {
-      "label": "format",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "csharpier",
-        "."
-      ],
-      "problemMatcher": []
-    },
-    {
-      "label": "format-check",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "csharpier",
-        "check",
-        "."
-      ],
-      "problemMatcher": []
-    },
-    {
-      "label": "run-build-script",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/build/build.csproj"
-      ],
-      "problemMatcher": "$msCompile"
-    },
-    {
-      "label": "pack",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "pack",
-        "${workspaceFolder}/src/SharpCompress/SharpCompress.csproj",
-        "-c",
-        "Release",
-        "-o",
-        "${workspaceFolder}/artifacts/"
-      ],
-      "problemMatcher": "$msCompile",
-      "dependsOn": "build-release"
-    },
-    {
-      "label": "performance-tests",
-      "command": "dotnet",
-      "type": "process",
-      "args": [
-        "run",
-        "--project",
-        "${workspaceFolder}/tests/SharpCompress.Performance/SharpCompress.Performance.csproj",
-        "-c",
-        "Release"
-      ],
-      "problemMatcher": "$msCompile"
-    }
-  ]
-}
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -49,30 +49,6 @@ SharpCompress is a pure C# compression library supporting multiple archive forma
 - Use `dotnet test` to run tests
 - Solution file: `SharpCompress.sln`

-### Directory Structure
-```
-src/SharpCompress/
-  ├── Archives/        # IArchive implementations (Zip, Tar, Rar, 7Zip, GZip)
-  ├── Readers/         # IReader implementations (forward-only)
-  ├── Writers/         # IWriter implementations (forward-only)
-  ├── Compressors/     # Low-level compression streams (BZip2, Deflate, LZMA, etc.)
-  ├── Factories/       # Format detection and factory pattern
-  ├── Common/          # Shared types (ArchiveType, Entry, Options)
-  ├── Crypto/          # Encryption implementations
-  └── IO/              # Stream utilities and wrappers
-
-tests/SharpCompress.Test/
-  ├── Zip/, Tar/, Rar/, SevenZip/, GZip/, BZip2/  # Format-specific tests
-  ├── TestBase.cs      # Base test class with helper methods
-  └── TestArchives/    # Test data (not checked into main test project)
-```
-
-### Factory Pattern
-All format types implement factory interfaces (`IArchiveFactory`, `IReaderFactory`, `IWriterFactory`) for auto-detection:
- `ReaderFactory.Open()` - Auto-detects format by probing stream
- `WriterFactory.Open()` - Creates writer for specified `ArchiveType`
- Factories located in: `src/SharpCompress/Factories/`
-
 ## Nullable Reference Types

 - Declare variables non-nullable, and check for `null` at entry points.
@@ -140,18 +116,3 @@ SharpCompress supports multiple archive and compression formats:
 - Use test archives from `tests/TestArchives` directory for consistency.
 - Test stream disposal and `LeaveStreamOpen` behavior.
 - Test edge cases: empty archives, large files, corrupted archives, encrypted archives.
-
-### Test Organization
- Base class: `TestBase` - Provides `TEST_ARCHIVES_PATH`, `SCRATCH_FILES_PATH`, temp directory management
- Framework: xUnit with AwesomeAssertions
- Test archives: `tests/TestArchives/` - Use existing archives, don't create new ones unnecessarily
- Match naming style of nearby test files
-
-## Common Pitfalls
-
-1. **Don't mix Archive and Reader APIs** - Archive needs seekable stream, Reader doesn't
-2. **Solid archives (Rar, 7Zip)** - Use `ExtractAllEntries()` for best performance, not individual entry extraction
-3. **Stream disposal** - Always set `LeaveStreamOpen` explicitly when needed (default is to close)
-4. **Tar + non-seekable stream** - Must provide file size or it will throw
-5. **Multi-framework differences** - Some features differ between .NET Framework and modern .NET (e.g., Mono.Posix)
-6. **Format detection** - Use `ReaderFactory.Open()` for auto-detection, test with actual archive files
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -4,17 +4,17 @@
    <PackageVersion Include="AwesomeAssertions" Version="9.3.0" />
    <PackageVersion Include="Glob" Version="1.1.9" />
    <PackageVersion Include="JetBrains.Profiler.SelfApi" Version="2.5.14" />
-    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="10.0.0" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
    <PackageVersion Include="Mono.Posix.NETStandard" Version="1.0.0" />
    <PackageVersion Include="SimpleExec" Version="12.0.0" />
    <PackageVersion Include="System.Buffers" Version="4.6.1" />
    <PackageVersion Include="System.Memory" Version="4.6.3" />
-    <PackageVersion Include="System.Text.Encoding.CodePages" Version="10.0.0" />
+    <PackageVersion Include="System.Text.Encoding.CodePages" Version="8.0.0" />
    <PackageVersion Include="xunit" Version="2.9.3" />
    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
    <PackageVersion Include="ZstdSharp.Port" Version="0.8.6" />
-    <PackageVersion Include="Microsoft.NET.ILLink.Tasks" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.NET.ILLink.Tasks" Version="8.0.21" />
    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
    <PackageVersion Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" />
  </ItemGroup>
--- a/FORMATS.md
+++ b/FORMATS.md
@@ -22,16 +22,11 @@
 | 7Zip (4)               | LZMA, LZMA2, BZip2, PPMd, BCJ, BCJ2, Deflate      | Decompress          | SevenZipArchive | N/A        | N/A           |

 1. SOLID Rars are only supported in the RarReader API.
-2. Zip format supports pkware and WinzipAES encryption. However, encrypted LZMA is not supported. Zip64 reading/writing is supported but only with seekable streams as the Zip spec doesn't support Zip64 data in post data descriptors. Deflate64 is only supported for reading. See [Zip Format Notes](#zip-format-notes) for details on multi-volume archives and streaming behavior.
+2. Zip format supports pkware and WinzipAES encryption. However, encrypted LZMA is not supported. Zip64 reading/writing is supported but only with seekable streams as the Zip spec doesn't support Zip64 data in post data descriptors. Deflate64 is only supported for reading.
 3. The Tar format requires a file size in the header. If no size is specified to the TarWriter and the stream is not seekable, then an exception will be thrown.
 4. The 7Zip format doesn't allow for reading as a forward-only stream so 7Zip is only supported through the Archive API
 5. LZip has no support for extra data like the file name or timestamp. There is a default filename used when looking at the entry Key on the archive.

-### Zip Format Notes
-
- Multi-volume/split ZIP archives require ZipArchive (seekable streams) as ZipReader cannot seek across volume files.
- ZipReader processes entries from LocalEntry headers (which include directory entries ending with `/`) and intentionally skips DirectoryEntry headers from the central directory, as they are redundant in streaming mode - all entry data comes from LocalEntry headers which ZipReader has already processed.
-
 ## Compression Streams

 For those who want to directly compress/decompress bits. The single file formats are represented here as well. However, BZip2, LZip and XZ have no metadata (GZip has a little) so using them without something like a Tar file makes little sense.
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # SharpCompress

-SharpCompress is a compression library in pure C# for .NET Framework 4.8, .NET 8.0 and .NET 10.0 that can unrar, un7zip, unzip, untar unbzip2, ungzip, unlzip, unzstd, unarc and unarj with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip/lzip are implemented.
+SharpCompress is a compression library in pure C# for .NET Framework 4.62, .NET Standard 2.1, .NET 6.0 and NET 8.0 that can unrar, un7zip, unzip, untar unbzip2, ungzip, unlzip, unzstd, unarc and unarj with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip/lzip are implemented.

 The major feature is support for non-seekable streams so large files can be processed on the fly (i.e. download stream).

--- a/build/build.csproj
+++ b/build/build.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Bullseye" />
--- a/build/packages.lock.json
+++ b/build/packages.lock.json
@@ -1,7 +1,7 @@
 {
  "version": 2,
  "dependencies": {
-    "net10.0": {
+    "net8.0": {
      "Bullseye": {
        "type": "Direct",
        "requested": "[6.0.0, )",
--- a/global.json
+++ b/global.json
@@ -1,6 +1,6 @@
 {
  "sdk": {
-    "version": "10.0.100",
+    "version": "8.0.100",
    "rollForward": "latestFeature"
  }
 }
--- a/src/SharpCompress/Archives/AbstractArchive.cs
+++ b/src/SharpCompress/Archives/AbstractArchive.cs
@@ -161,11 +161,6 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
    /// </summary>
    public virtual bool IsSolid => false;

-    /// <summary>
-    /// Archive is ENCRYPTED (this means the Archive has password-protected files).
-    /// </summary>
-    public virtual bool IsEncrypted => false;
-
    /// <summary>
    /// The archive can find all the parts of the archive needed to fully extract the archive.  This forces the parsing of the entire archive.
    /// </summary>
@@ -177,4 +172,9 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IArchiveExtra
            return Entries.All(x => x.IsComplete);
        }
    }
+
+    public virtual bool IsMultiVolume =>
+        _sourceStream?.Files.Count > 1 || _sourceStream?.Streams.Count > 1;
+
+    public virtual bool SupportsMultiThreading => false;
 }
--- a/src/SharpCompress/Archives/ArchiveFactory.cs
+++ b/src/SharpCompress/Archives/ArchiveFactory.cs
@@ -3,10 +3,6 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using SharpCompress.Common;
-using SharpCompress.Common.Tar.Headers;
-using SharpCompress.Compressors;
-using SharpCompress.Compressors.BZip2;
-using SharpCompress.Compressors.LZMA;
 using SharpCompress.Factories;
 using SharpCompress.IO;
 using SharpCompress.Readers;
@@ -135,10 +131,10 @@ public static class ArchiveFactory
    {
        finfo.NotNull(nameof(finfo));
        using Stream stream = finfo.OpenRead();
-        return FindFactory<T>(stream, finfo.Name);
+        return FindFactory<T>(stream);
    }

-    private static T FindFactory<T>(Stream stream, string? fileName = null)
+    private static T FindFactory<T>(Stream stream)
        where T : IFactory
    {
        stream.NotNull(nameof(stream));
@@ -163,16 +159,6 @@ public static class ArchiveFactory
            }
        }

-        stream.Seek(startPosition, SeekOrigin.Begin);
-
-        // Check if this is a compressed tar file (tar.bz2, tar.lz, etc.)
-        // These formats are supported by ReaderFactory but not by ArchiveFactory
-        var compressedTarMessage = TryGetCompressedTarMessage(stream, fileName);
-        if (compressedTarMessage != null)
-        {
-            throw new InvalidOperationException(compressedTarMessage);
-        }
-
        var extensions = string.Join(", ", factories.Select(item => item.Name));

        throw new InvalidOperationException(
@@ -262,111 +248,4 @@ public static class ArchiveFactory
    }

    public static IArchiveFactory AutoFactory { get; } = new AutoArchiveFactory();
-
-    /// <summary>
-    /// Checks if the stream is a compressed tar file (tar.bz2, tar.lz, etc.) that should use ReaderFactory instead.
-    /// Returns an error message if detected, null otherwise.
-    /// </summary>
-    private static string? TryGetCompressedTarMessage(Stream stream, string? fileName)
-    {
-        var startPosition = stream.Position;
-        try
-        {
-            // Check if it's a BZip2 file
-            if (BZip2Stream.IsBZip2(stream))
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                // Try to decompress and check if it contains a tar archive
-                using var decompressed = new BZip2Stream(stream, CompressionMode.Decompress, true);
-                if (IsTarStream(decompressed))
-                {
-                    return "This appears to be a tar.bz2 archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-                return null;
-            }
-
-            stream.Seek(startPosition, SeekOrigin.Begin);
-
-            // Check if it's an LZip file
-            if (LZipStream.IsLZipFile(stream))
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                // Try to decompress and check if it contains a tar archive
-                using var decompressed = new LZipStream(stream, CompressionMode.Decompress);
-                if (IsTarStream(decompressed))
-                {
-                    return "This appears to be a tar.lz archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-                return null;
-            }
-
-            // Check file extension as a fallback for other compressed tar formats
-            if (fileName != null)
-            {
-                var lowerFileName = fileName.ToLowerInvariant();
-                if (
-                    lowerFileName.EndsWith(".tar.bz2")
-                    || lowerFileName.EndsWith(".tbz")
-                    || lowerFileName.EndsWith(".tbz2")
-                    || lowerFileName.EndsWith(".tb2")
-                    || lowerFileName.EndsWith(".tz2")
-                    || lowerFileName.EndsWith(".tar.lz")
-                    || lowerFileName.EndsWith(".tar.xz")
-                    || lowerFileName.EndsWith(".txz")
-                    || lowerFileName.EndsWith(".tar.zst")
-                    || lowerFileName.EndsWith(".tar.zstd")
-                    || lowerFileName.EndsWith(".tzst")
-                    || lowerFileName.EndsWith(".tzstd")
-                    || lowerFileName.EndsWith(".tar.z")
-                    || lowerFileName.EndsWith(".tz")
-                    || lowerFileName.EndsWith(".taz")
-                )
-                {
-                    return $"The file '{fileName}' appears to be a compressed tar archive. The Archive API requires seekable streams, but decompression streams are not seekable. "
-                        + "Please use ReaderFactory.Open() instead for forward-only extraction, "
-                        + "or decompress the file first and then open the resulting tar file with ArchiveFactory.Open().";
-                }
-            }
-
-            return null;
-        }
-        catch
-        {
-            // If we can't determine, just return null and let the normal error handling proceed
-            return null;
-        }
-        finally
-        {
-            try
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-            }
-            catch
-            {
-                // Ignore seek failures
-            }
-        }
-    }
-
-    /// <summary>
-    /// Checks if a stream contains a tar archive by trying to read a tar header.
-    /// </summary>
-    private static bool IsTarStream(Stream stream)
-    {
-        try
-        {
-            var tarHeader = new TarHeader(new ArchiveEncoding());
-            return tarHeader.Read(new BinaryReader(stream));
-        }
-        catch
-        {
-            return false;
-        }
-    }
 }
--- a/src/SharpCompress/Archives/IArchive.cs
+++ b/src/SharpCompress/Archives/IArchive.cs
@@ -45,4 +45,14 @@ public interface IArchive : IDisposable
    /// The total size of the files as uncompressed in the archive.
    /// </summary>
    long TotalUncompressSize { get; }
+
+    /// <summary>
+    /// Is the archive part of a multi-volume set.
+    /// </summary>
+    bool IsMultiVolume { get; }
+
+    /// <summary>
+    /// Does the archive support multi-threaded extraction.
+    /// </summary>
+    bool SupportsMultiThreading { get; }
 }
--- a/src/SharpCompress/Archives/IArchiveEntryExtensions.cs
+++ b/src/SharpCompress/Archives/IArchiveEntryExtensions.cs
@@ -88,7 +88,7 @@ public static class IArchiveEntryExtensions
            entry,
            destinationDirectory,
            options,
-            (x, opt) => entry.WriteToFileAsync(x, opt, cancellationToken),
+            entry.WriteToFileAsync,
            cancellationToken
        );

@@ -124,10 +124,10 @@ public static class IArchiveEntryExtensions
            entry,
            destinationFileName,
            options,
-            async (x, fm) =>
+            async (x, fm, ct) =>
            {
                using var fs = File.Open(destinationFileName, fm);
-                await entry.WriteToAsync(fs, cancellationToken).ConfigureAwait(false);
+                await entry.WriteToAsync(fs, ct).ConfigureAwait(false);
            },
            cancellationToken
        );
--- a/src/SharpCompress/Archives/Rar/FileInfoRarArchiveVolume.cs
+++ b/src/SharpCompress/Archives/Rar/FileInfoRarArchiveVolume.cs
@@ -1,39 +0,0 @@
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using System.IO;
-using System.Linq;
-using SharpCompress.Common.Rar;
-using SharpCompress.Common.Rar.Headers;
-using SharpCompress.IO;
-using SharpCompress.Readers;
-
-namespace SharpCompress.Archives.Rar;
-
-/// <summary>
-/// A rar part based on a FileInfo object
-/// </summary>
-internal class FileInfoRarArchiveVolume : RarVolume
-{
-    internal FileInfoRarArchiveVolume(FileInfo fileInfo, ReaderOptions options, int index)
-        : base(StreamingMode.Seekable, fileInfo.OpenRead(), FixOptions(options), index)
-    {
-        FileInfo = fileInfo;
-        FileParts = GetVolumeFileParts().ToArray().ToReadOnly();
-    }
-
-    private static ReaderOptions FixOptions(ReaderOptions options)
-    {
-        //make sure we're closing streams with fileinfo
-        options.LeaveStreamOpen = false;
-        return options;
-    }
-
-    internal ReadOnlyCollection<RarFilePart> FileParts { get; }
-
-    internal FileInfo FileInfo { get; }
-
-    internal override RarFilePart CreateFilePart(MarkHeader markHeader, FileHeader fileHeader) =>
-        new FileInfoRarFilePart(this, ReaderOptions.Password, markHeader, fileHeader, FileInfo);
-
-    internal override IEnumerable<RarFilePart> ReadFileParts() => FileParts;
-}
--- a/src/SharpCompress/Archives/Rar/FileInfoRarFilePart.cs
+++ b/src/SharpCompress/Archives/Rar/FileInfoRarFilePart.cs
@@ -1,21 +0,0 @@
-using System.IO;
-using SharpCompress.Common.Rar.Headers;
-
-namespace SharpCompress.Archives.Rar;
-
-internal sealed class FileInfoRarFilePart : SeekableFilePart
-{
-    internal FileInfoRarFilePart(
-        FileInfoRarArchiveVolume volume,
-        string? password,
-        MarkHeader mh,
-        FileHeader fh,
-        FileInfo fi
-    )
-        : base(mh, fh, volume.Index, volume.Stream, password) => FileInfo = fi;
-
-    internal FileInfo FileInfo { get; }
-
-    internal override string FilePartName =>
-        "Rar File: " + FileInfo.FullName + " File Entry: " + FileHeader.FileName;
-}
--- a/src/SharpCompress/Archives/Rar/RarArchive.cs
+++ b/src/SharpCompress/Archives/Rar/RarArchive.cs
@@ -47,9 +47,9 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
    {
        sourceStream.LoadAllParts(); //request all streams
        var streams = sourceStream.Streams.ToArray();
-        var i = 0;
        if (streams.Length > 1 && IsRarFile(streams[1], ReaderOptions)) //test part 2 - true = multipart not split
        {
+            var i = 0;
            sourceStream.IsVolumes = true;
            streams[1].Position = 0;
            sourceStream.Position = 0;
@@ -57,12 +57,18 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
            return sourceStream.Streams.Select(a => new StreamRarArchiveVolume(
                a,
                ReaderOptions,
-                i++
+                i++,
+                IsMultiVolume
            ));
        }

        //split mode or single file
-        return new StreamRarArchiveVolume(sourceStream, ReaderOptions, i++).AsEnumerable();
+        return new StreamRarArchiveVolume(
+            sourceStream,
+            ReaderOptions,
+            0,
+            IsMultiVolume
+        ).AsEnumerable();
    }

    protected override IReader CreateReaderForSolidExtraction()
@@ -83,8 +89,7 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
    }

    public override bool IsSolid => Volumes.First().IsSolidArchive;
-
-    public override bool IsEncrypted => Entries.First(x => !x.IsDirectory).IsEncrypted;
+    public override bool SupportsMultiThreading => !IsMultiVolume && !IsSolid;

    public virtual int MinVersion => Volumes.First().MinVersion;
    public virtual int MaxVersion => Volumes.First().MaxVersion;
--- a/src/SharpCompress/Archives/Rar/RarArchiveEntry.cs
+++ b/src/SharpCompress/Archives/Rar/RarArchiveEntry.cs
@@ -134,4 +134,6 @@ public class RarArchiveEntry : RarEntry, IArchiveEntry
            );
        }
    }
+
+    public override bool SupportsMultiThreading => Parts.Single().SupportsMultiThreading;
 }
--- a/src/SharpCompress/Archives/Rar/SeekableRarFilePart.cs
+++ b/src/SharpCompress/Archives/Rar/SeekableRarFilePart.cs
@@ -1,25 +1,29 @@
 using System.IO;
 using SharpCompress.Common.Rar;
 using SharpCompress.Common.Rar.Headers;
+using SharpCompress.IO;

 namespace SharpCompress.Archives.Rar;

-internal class SeekableFilePart : RarFilePart
+internal class SeekableRarFilePart : RarFilePart
 {
    private readonly Stream _stream;
    private readonly string? _password;
+    private readonly bool _isMultiVolume;

-    internal SeekableFilePart(
+    internal SeekableRarFilePart(
        MarkHeader mh,
        FileHeader fh,
        int index,
        Stream stream,
-        string? password
+        string? password,
+        bool isMultiVolume
    )
        : base(mh, fh, index)
    {
        _stream = stream;
        _password = password;
+        _isMultiVolume = isMultiVolume;
    }

    internal override Stream GetCompressedStream()
@@ -42,4 +46,7 @@ internal class SeekableFilePart : RarFilePart
    }

    internal override string FilePartName => "Unknown Stream - File Entry: " + FileHeader.FileName;
+
+    public override bool SupportsMultiThreading =>
+        !_isMultiVolume && _stream is SourceStream ss && ss.IsFileMode && ss.Files.Count == 1;
 }
--- a/src/SharpCompress/Archives/Rar/StreamRarArchiveVolume.cs
+++ b/src/SharpCompress/Archives/Rar/StreamRarArchiveVolume.cs
@@ -9,11 +9,28 @@ namespace SharpCompress.Archives.Rar;

 internal class StreamRarArchiveVolume : RarVolume
 {
-    internal StreamRarArchiveVolume(Stream stream, ReaderOptions options, int index)
-        : base(StreamingMode.Seekable, stream, options, index) { }
+    private readonly bool _isMultiVolume;
+
+    internal StreamRarArchiveVolume(
+        Stream stream,
+        ReaderOptions options,
+        int index,
+        bool isMultiVolume
+    )
+        : base(StreamingMode.Seekable, stream, options, index)
+    {
+        _isMultiVolume = isMultiVolume;
+    }

    internal override IEnumerable<RarFilePart> ReadFileParts() => GetVolumeFileParts();

    internal override RarFilePart CreateFilePart(MarkHeader markHeader, FileHeader fileHeader) =>
-        new SeekableFilePart(markHeader, fileHeader, Index, Stream, ReaderOptions.Password);
+        new SeekableRarFilePart(
+            markHeader,
+            fileHeader,
+            Index,
+            Stream,
+            ReaderOptions.Password,
+            _isMultiVolume
+        );
 }
--- a/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
+++ b/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
@@ -205,8 +205,6 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
            .GroupBy(x => x.FilePart.Folder)
            .Any(folder => folder.Count() > 1);

-    public override bool IsEncrypted => Entries.First(x => !x.IsDirectory).IsEncrypted;
-
    public override long TotalSize =>
        _database?._packSizes.Aggregate(0L, (total, packSize) => total + packSize) ?? 0;

--- a/src/SharpCompress/Archives/Zip/ZipArchive.cs
+++ b/src/SharpCompress/Archives/Zip/ZipArchive.cs
@@ -283,7 +283,12 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>

                            yield return new ZipArchiveEntry(
                                this,
-                                new SeekableZipFilePart(headerFactory.NotNull(), deh, s)
+                                new SeekableZipFilePart(
+                                    headerFactory.NotNull(),
+                                    deh,
+                                    s,
+                                    IsMultiVolume
+                                )
                            );
                        }
                        break;
@@ -385,4 +390,6 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
        ((IStreamStack)stream).StackSeek(0);
        return ZipReader.Open(stream, ReaderOptions, Entries);
    }
+
+    public override bool SupportsMultiThreading => !IsMultiVolume;
 }
--- a/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs
+++ b/src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs
@@ -23,5 +23,7 @@ public class ZipArchiveEntry : ZipEntry, IArchiveEntry

    public bool IsComplete => true;

+    public override bool SupportsMultiThreading => Parts.Single().SupportsMultiThreading;
+
    #endregion
 }
--- a/src/SharpCompress/Common/Entry.cs
+++ b/src/SharpCompress/Common/Entry.cs
@@ -87,4 +87,5 @@ public abstract class Entry : IEntry
    /// Entry file attribute.
    /// </summary>
    public virtual int? Attrib => throw new NotImplementedException();
+    public virtual bool SupportsMultiThreading => false;
 }
--- a/src/SharpCompress/Common/ExtractionMethods.cs
+++ b/src/SharpCompress/Common/ExtractionMethods.cs
@@ -128,7 +128,7 @@ internal static class ExtractionMethods
        IEntry entry,
        string destinationDirectory,
        ExtractionOptions? options,
-        Func<string, ExtractionOptions?, Task> writeAsync,
+        Func<string, ExtractionOptions?, CancellationToken, Task> writeAsync,
        CancellationToken cancellationToken = default
    )
    {
@@ -189,7 +189,7 @@ internal static class ExtractionMethods
                    "Entry is trying to write a file outside of the destination directory."
                );
            }
-            await writeAsync(destinationFileName, options).ConfigureAwait(false);
+            await writeAsync(destinationFileName, options, cancellationToken).ConfigureAwait(false);
        }
        else if (options.ExtractFullPath && !Directory.Exists(destinationFileName))
        {
@@ -201,7 +201,7 @@ internal static class ExtractionMethods
        IEntry entry,
        string destinationFileName,
        ExtractionOptions? options,
-        Func<string, FileMode, Task> openAndWriteAsync,
+        Func<string, FileMode, CancellationToken, Task> openAndWriteAsync,
        CancellationToken cancellationToken = default
    )
    {
@@ -225,7 +225,8 @@ internal static class ExtractionMethods
                fm = FileMode.CreateNew;
            }

-            await openAndWriteAsync(destinationFileName, fm).ConfigureAwait(false);
+            await openAndWriteAsync(destinationFileName, fm, cancellationToken)
+                .ConfigureAwait(false);
            entry.PreserveExtractionOptions(destinationFileName, options);
        }
    }
--- a/src/SharpCompress/Common/FilePart.cs
+++ b/src/SharpCompress/Common/FilePart.cs
@@ -14,4 +14,6 @@ public abstract class FilePart
    internal abstract Stream? GetCompressedStream();
    internal abstract Stream? GetRawStream();
    internal bool Skipped { get; set; }
+
+    public virtual bool SupportsMultiThreading => false;
 }
--- a/src/SharpCompress/Common/IEntry.cs
+++ b/src/SharpCompress/Common/IEntry.cs
@@ -21,4 +21,5 @@ public interface IEntry
    DateTime? LastModifiedTime { get; }
    long Size { get; }
    int? Attrib { get; }
+    bool SupportsMultiThreading { get; }
 }
--- a/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs
+++ b/src/SharpCompress/Common/Zip/SeekableZipFilePart.cs
@@ -1,5 +1,6 @@
 using System.IO;
 using SharpCompress.Common.Zip.Headers;
+using SharpCompress.IO;

 namespace SharpCompress.Common.Zip;

@@ -7,13 +8,19 @@ internal class SeekableZipFilePart : ZipFilePart
 {
    private bool _isLocalHeaderLoaded;
    private readonly SeekableZipHeaderFactory _headerFactory;
+    private readonly bool _isMultiVolume;

    internal SeekableZipFilePart(
        SeekableZipHeaderFactory headerFactory,
        DirectoryEntryHeader header,
-        Stream stream
+        Stream stream,
+        bool isMultiVolume
    )
-        : base(header, stream) => _headerFactory = headerFactory;
+        : base(header, stream)
+    {
+        _headerFactory = headerFactory;
+        _isMultiVolume = isMultiVolume;
+    }

    internal override Stream GetCompressedStream()
    {
@@ -30,8 +37,20 @@ internal class SeekableZipFilePart : ZipFilePart

    protected override Stream CreateBaseStream()
    {
+        if (!_isMultiVolume && BaseStream is SourceStream ss)
+        {
+            if (ss.IsFileMode && ss.Files.Count == 1)
+            {
+                var fileStream = ss.CurrentFile.OpenRead();
+                fileStream.Position = Header.DataStartPosition.NotNull();
+                return fileStream;
+            }
+        }
        BaseStream.Position = Header.DataStartPosition.NotNull();

        return BaseStream;
    }
+
+    public override bool SupportsMultiThreading =>
+        !_isMultiVolume && BaseStream is SourceStream ss && ss.IsFileMode && ss.Files.Count == 1;
 }
--- a/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs
+++ b/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Buffers.Binary;
 using System.Security.Cryptography;
-using System.Text;

 namespace SharpCompress.Common.Zip;

@@ -20,24 +19,8 @@ internal class WinzipAesEncryptionData
    {
        _keySize = keySize;

-#if NETFRAMEWORK
+#if NETFRAMEWORK || NETSTANDARD2_0
        var rfc2898 = new Rfc2898DeriveBytes(password, salt, RFC2898_ITERATIONS);
-        KeyBytes = rfc2898.GetBytes(KeySizeInBytes);
-        IvBytes = rfc2898.GetBytes(KeySizeInBytes);
-        var generatedVerifyValue = rfc2898.GetBytes(2);
-#elif NET10_0_OR_GREATER
-        var derivedKeySize = (KeySizeInBytes * 2) + 2;
-        var passwordBytes = Encoding.UTF8.GetBytes(password);
-        var derivedKey = Rfc2898DeriveBytes.Pbkdf2(
-            passwordBytes,
-            salt,
-            RFC2898_ITERATIONS,
-            HashAlgorithmName.SHA1,
-            derivedKeySize
-        );
-        KeyBytes = derivedKey.AsSpan(0, KeySizeInBytes).ToArray();
-        IvBytes = derivedKey.AsSpan(KeySizeInBytes, KeySizeInBytes).ToArray();
-        var generatedVerifyValue = derivedKey.AsSpan((KeySizeInBytes * 2), 2).ToArray();
 #else
        var rfc2898 = new Rfc2898DeriveBytes(
            password,
@@ -45,10 +28,11 @@ internal class WinzipAesEncryptionData
            RFC2898_ITERATIONS,
            HashAlgorithmName.SHA1
        );
-        KeyBytes = rfc2898.GetBytes(KeySizeInBytes);
+#endif
+
+        KeyBytes = rfc2898.GetBytes(KeySizeInBytes); // 16 or 24 or 32 ???
        IvBytes = rfc2898.GetBytes(KeySizeInBytes);
        var generatedVerifyValue = rfc2898.GetBytes(2);
-#endif

        var verify = BinaryPrimitives.ReadInt16LittleEndian(passwordVerifyValue);
        var generated = BinaryPrimitives.ReadInt16LittleEndian(generatedVerifyValue);
--- a/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
+++ b/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
@@ -544,12 +544,6 @@ internal sealed class CBZip2OutputStream : Stream, IStreamStack

    private void EndBlock()
    {
-        // Skip block processing for empty input (no data written)
-        if (last < 0)
-        {
-            return;
-        }
-
        blockCRC = mCrc.GetFinalCRC();
        combinedCRC = (combinedCRC << 1) | (int)(((uint)combinedCRC) >> 31);
        combinedCRC ^= blockCRC;
--- a/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs
+++ b/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs
@@ -62,10 +62,6 @@ internal sealed class MultiVolumeReadOnlyStream : Stream, IStreamStack
        base.Dispose(disposing);
        if (disposing)
        {
-#if DEBUG_STREAMS
-            this.DebugDispose(typeof(MultiVolumeReadOnlyStream));
-#endif
-
            if (filePartEnumerator != null)
            {
                filePartEnumerator.Dispose();
--- a/src/SharpCompress/Compressors/Rar/RarStream.cs
+++ b/src/SharpCompress/Compressors/Rar/RarStream.cs
@@ -82,9 +82,6 @@ internal class RarStream : Stream, IStreamStack
        {
            if (disposing)
            {
-#if DEBUG_STREAMS
-                this.DebugDispose(typeof(RarStream));
-#endif
                ArrayPool<byte>.Shared.Return(this.tmpBuffer);
                this.tmpBuffer = null;
            }
--- a/src/SharpCompress/Factories/TarFactory.cs
+++ b/src/SharpCompress/Factories/TarFactory.cs
@@ -57,238 +57,19 @@ public class TarFactory
        Stream stream,
        string? password = null,
        int bufferSize = ReaderOptions.DefaultBufferSize
-    )
-    {
-        if (!stream.CanSeek)
-        {
-            return TarArchive.IsTarFile(stream); // For non-seekable streams, just check if it's a tar file
-        }
-
-        var startPosition = stream.Position;
-
-        // First check if it's a regular tar file
-        if (TarArchive.IsTarFile(stream))
-        {
-            stream.Seek(startPosition, SeekOrigin.Begin); // Seek back for consistency
-            return true;
-        }
-
-        // Seek back after the tar file check
-        stream.Seek(startPosition, SeekOrigin.Begin);
-
-        if (compressionOptions == null)
-        {
-            return false;
-        }
-
-        try
-        {
-            // Try each compression option to see if it contains a tar file
-            foreach (var testOption in compressionOptions)
-            {
-                if (testOption.Type == CompressionType.None)
-                {
-                    continue; // Skip uncompressed
-                }
-
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                try
-                {
-                    if (testOption.CanHandle(stream))
-                    {
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-
-                        // Try to decompress and check if it contains a tar archive
-                        // For compression formats that don't support leaveOpen, we need to save/restore position
-                        var positionBeforeDecompress = stream.Position;
-                        Stream? decompressedStream = null;
-                        bool streamWasClosed = false;
-                        
-                        try
-                        {
-                            decompressedStream = testOption.Type switch
-                            {
-                                CompressionType.BZip2 => new BZip2Stream(stream, CompressionMode.Decompress, true),
-                                _ => testOption.CreateStream(stream) // For other types, may close the stream
-                            };
-
-                            if (TarArchive.IsTarFile(decompressedStream))
-                            {
-                                return true;
-                            }
-                        }
-                        catch (ObjectDisposedException)
-                        {
-                            streamWasClosed = true;
-                            throw; // Stream was closed, can't continue
-                        }
-                        finally
-                        {
-                            decompressedStream?.Dispose();
-                            
-                            if (!streamWasClosed && stream.CanSeek)
-                            {
-                                try
-                                {
-                                    stream.Seek(positionBeforeDecompress, SeekOrigin.Begin);
-                                }
-                                catch
-                                {
-                                    // If seek fails, the stream might have been closed
-                                }
-                            }
-                        }
-
-                        // Seek back to start after decompression attempt
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-                    }
-                }
-                catch
-                {
-                    // If decompression fails, it's not this format - continue to next option
-                    try
-                    {
-                        stream.Seek(startPosition, SeekOrigin.Begin);
-                    }
-                    catch
-                    {
-                        // Ignore seek failures
-                    }
-                }
-            }
-
-            return false;
-        }
-        finally
-        {
-            try
-            {
-                stream.Seek(startPosition, SeekOrigin.Begin);
-            }
-            catch
-            {
-                // Ignore seek failures
-            }
-        }
-    }
+    ) => TarArchive.IsTarFile(stream);

    #endregion

    #region IArchiveFactory

    /// <inheritdoc/>
-    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null)
-    {
-        readerOptions ??= new ReaderOptions();
-
-        // Try to detect and handle compressed tar formats
-        if (stream.CanSeek)
-        {
-            var startPosition = stream.Position;
-
-            // Try each compression option to see if we can decompress it
-            foreach (var testOption in compressionOptions)
-            {
-                if (testOption.Type == CompressionType.None)
-                {
-                    continue; // Skip uncompressed
-                }
-
-                stream.Seek(startPosition, SeekOrigin.Begin);
-
-                if (testOption.CanHandle(stream))
-                {
-                    stream.Seek(startPosition, SeekOrigin.Begin);
-
-                    // Decompress the entire stream into a seekable MemoryStream
-                    using var decompressedStream = testOption.CreateStream(stream);
-                    var memoryStream = new MemoryStream();
-                    decompressedStream.CopyTo(memoryStream);
-                    memoryStream.Position = 0;
-
-                    // Verify it's actually a tar file
-                    if (TarArchive.IsTarFile(memoryStream))
-                    {
-                        memoryStream.Position = 0;
-                        // Return a TarArchive from the decompressed memory stream
-                        // The TarArchive will own the MemoryStream and dispose it when disposed
-                        var options = new ReaderOptions
-                        {
-                            LeaveStreamOpen = false, // Ensure the MemoryStream is disposed with the archive
-                            ArchiveEncoding = readerOptions?.ArchiveEncoding ?? new ArchiveEncoding()
-                        };
-                        return TarArchive.Open(memoryStream, options);
-                    }
-
-                    memoryStream.Dispose();
-                }
-            }
-
-            stream.Seek(startPosition, SeekOrigin.Begin);
-        }
-
-        // Fall back to normal tar archive opening
-        return TarArchive.Open(stream, readerOptions);
-    }
+    public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(stream, readerOptions);

    /// <inheritdoc/>
-    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null)
-    {
-        readerOptions ??= new ReaderOptions();
-
-        // Try to detect and handle compressed tar formats by file extension and content
-        using var fileStream = fileInfo.OpenRead();
-
-        // Try each compression option
-        foreach (var testOption in compressionOptions)
-        {
-            if (testOption.Type == CompressionType.None)
-            {
-                continue; // Skip uncompressed
-            }
-
-            // Check if file extension matches
-            var fileName = fileInfo.Name.ToLowerInvariant();
-            if (testOption.KnownExtensions.Any(ext => fileName.EndsWith(ext)))
-            {
-                fileStream.Position = 0;
-
-                // Verify it's the right compression format
-                if (testOption.CanHandle(fileStream))
-                {
-                    fileStream.Position = 0;
-
-                    // Decompress the entire file into a seekable MemoryStream
-                    using var decompressedStream = testOption.CreateStream(fileStream);
-                    var memoryStream = new MemoryStream();
-                    decompressedStream.CopyTo(memoryStream);
-                    memoryStream.Position = 0;
-
-                    // Verify it's actually a tar file
-                    if (TarArchive.IsTarFile(memoryStream))
-                    {
-                        memoryStream.Position = 0;
-                        // Return a TarArchive from the decompressed memory stream
-                        // The TarArchive will own the MemoryStream and dispose it when disposed
-                        var options = new ReaderOptions
-                        {
-                            LeaveStreamOpen = false, // Ensure the MemoryStream is disposed with the archive
-                            ArchiveEncoding = readerOptions?.ArchiveEncoding ?? new ArchiveEncoding()
-                        };
-                        return TarArchive.Open(memoryStream, options);
-                    }
-
-                    memoryStream.Dispose();
-                }
-            }
-        }
-
-        // fileStream will be closed by the using statement
-
-        // Fall back to normal tar archive opening
-        return TarArchive.Open(fileInfo, readerOptions);
-    }
+    public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
+        TarArchive.Open(fileInfo, readerOptions);

    #endregion

--- a/src/SharpCompress/IO/SourceStream.cs
+++ b/src/SharpCompress/IO/SourceStream.cs
@@ -15,7 +15,7 @@ public class SourceStream : Stream, IStreamStack
 #endif
    int IStreamStack.DefaultBufferSize { get; set; }

-    Stream IStreamStack.BaseStream() => _streams[_stream];
+    Stream IStreamStack.BaseStream() => _streams[_streamIndex];

    int IStreamStack.BufferSize
    {
@@ -35,7 +35,7 @@ public class SourceStream : Stream, IStreamStack
    private readonly List<Stream> _streams;
    private readonly Func<int, FileInfo?>? _getFilePart;
    private readonly Func<int, Stream?>? _getStreamPart;
-    private int _stream;
+    private int _streamIndex;

    public SourceStream(FileInfo file, Func<int, FileInfo?> getPart, ReaderOptions options)
        : this(null, null, file, getPart, options) { }
@@ -59,7 +59,7 @@ public class SourceStream : Stream, IStreamStack

        if (!IsFileMode)
        {
-            _streams.Add(stream!);
+            _streams.Add(stream.NotNull("stream is null"));
            _getStreamPart = getStreamPart;
            _getFilePart = _ => null;
            if (stream is FileStream fileStream)
@@ -69,12 +69,12 @@ public class SourceStream : Stream, IStreamStack
        }
        else
        {
-            _files.Add(file!);
+            _files.Add(file.NotNull("file is null"));
            _streams.Add(_files[0].OpenRead());
            _getFilePart = getFilePart;
            _getStreamPart = _ => null;
        }
-        _stream = 0;
+        _streamIndex = 0;
        _prevSize = 0;

 #if DEBUG_STREAMS
@@ -93,10 +93,12 @@ public class SourceStream : Stream, IStreamStack
    public ReaderOptions ReaderOptions { get; }
    public bool IsFileMode { get; }

-    public IEnumerable<FileInfo> Files => _files;
-    public IEnumerable<Stream> Streams => _streams;
+    public IReadOnlyList<FileInfo> Files => _files;
+    public IReadOnlyList<Stream> Streams => _streams;

-    private Stream Current => _streams[_stream];
+    private Stream Current => _streams[_streamIndex];
+
+    public FileInfo CurrentFile => _files[_streamIndex];

    public bool LoadStream(int index) //ensure all parts to id are loaded
    {
@@ -107,7 +109,7 @@ public class SourceStream : Stream, IStreamStack
                var f = _getFilePart.NotNull("GetFilePart is null")(_streams.Count);
                if (f == null)
                {
-                    _stream = _streams.Count - 1;
+                    _streamIndex = _streams.Count - 1;
                    return false;
                }
                //throw new Exception($"File part {idx} not available.");
@@ -119,7 +121,7 @@ public class SourceStream : Stream, IStreamStack
                var s = _getStreamPart.NotNull("GetStreamPart is null")(_streams.Count);
                if (s == null)
                {
-                    _stream = _streams.Count - 1;
+                    _streamIndex = _streams.Count - 1;
                    return false;
                }
                //throw new Exception($"Stream part {idx} not available.");
@@ -137,10 +139,10 @@ public class SourceStream : Stream, IStreamStack
    {
        if (LoadStream(idx))
        {
-            _stream = idx;
+            _streamIndex = idx;
        }

-        return _stream == idx;
+        return _streamIndex == idx;
    }

    public override bool CanRead => true;
@@ -184,7 +186,7 @@ public class SourceStream : Stream, IStreamStack
                var length = Current.Length;

                // Load next file if present
-                if (!SetStream(_stream + 1))
+                if (!SetStream(_streamIndex + 1))
                {
                    break;
                }
@@ -223,7 +225,7 @@ public class SourceStream : Stream, IStreamStack
            while (_prevSize + Current.Length < pos)
            {
                _prevSize += Current.Length;
-                SetStream(_stream + 1);
+                SetStream(_streamIndex + 1);
            }
        }

@@ -273,7 +275,7 @@ public class SourceStream : Stream, IStreamStack
                var length = Current.Length;

                // Load next file if present
-                if (!SetStream(_stream + 1))
+                if (!SetStream(_streamIndex + 1))
                {
                    break;
                }
@@ -322,7 +324,7 @@ public class SourceStream : Stream, IStreamStack
                var length = Current.Length;

                // Load next file if present
-                if (!SetStream(_stream + 1))
+                if (!SetStream(_streamIndex + 1))
                {
                    break;
                }
--- a/src/SharpCompress/Readers/IReaderExtensions.cs
+++ b/src/SharpCompress/Readers/IReaderExtensions.cs
@@ -82,7 +82,7 @@ public static class IReaderExtensions
                reader.Entry,
                destinationDirectory,
                options,
-                (fileName, opts) => reader.WriteEntryToFileAsync(fileName, opts, cancellationToken),
+                reader.WriteEntryToFileAsync,
                cancellationToken
            )
            .ConfigureAwait(false);
@@ -101,10 +101,10 @@ public static class IReaderExtensions
                reader.Entry,
                destinationFileName,
                options,
-                async (x, fm) =>
+                async (x, fm, ct) =>
                {
                    using var fs = File.Open(destinationFileName, fm);
-                    await reader.WriteEntryToAsync(fs, cancellationToken).ConfigureAwait(false);
+                    await reader.WriteEntryToAsync(fs, ct).ConfigureAwait(false);
                },
                cancellationToken
            )
--- a/src/SharpCompress/Readers/Zip/ZipReader.cs
+++ b/src/SharpCompress/Readers/Zip/ZipReader.cs
@@ -75,14 +75,6 @@ public class ZipReader : AbstractReader<ZipEntry, ZipVolume>
                            );
                        }
                        break;
-                    case ZipHeaderType.DirectoryEntry:
-                        // DirectoryEntry headers in the central directory are intentionally skipped.
-                        // In streaming mode, we can only read forward, and DirectoryEntry headers
-                        // reference LocalEntry headers that have already been processed. The file
-                        // data comes from LocalEntry headers, not DirectoryEntry headers.
-                        // For multi-volume ZIPs where file data spans multiple files, use ZipArchive
-                        // instead, which requires seekable streams.
-                        break;
                    case ZipHeaderType.DirectoryEnd:
                    {
                        yield break;
--- a/src/SharpCompress/SharpCompress.csproj
+++ b/src/SharpCompress/SharpCompress.csproj
@@ -2,11 +2,11 @@
  <PropertyGroup>
    <AssemblyTitle>SharpCompress - Pure C# Decompression/Compression</AssemblyTitle>
    <NeutralLanguage>en-US</NeutralLanguage>
-    <VersionPrefix>0.42.0</VersionPrefix>
-    <AssemblyVersion>0.42.0</AssemblyVersion>
-    <FileVersion>0.42.0</FileVersion>
+    <VersionPrefix>0.41.0</VersionPrefix>
+    <AssemblyVersion>0.41.0</AssemblyVersion>
+    <FileVersion>0.41.0</FileVersion>
    <Authors>Adam Hathcock</Authors>
-    <TargetFrameworks>net48;net8.0;net10.0</TargetFrameworks>
+    <TargetFrameworks>net48;net481;netstandard2.0;net6.0;net8.0</TargetFrameworks>
    <AssemblyName>SharpCompress</AssemblyName>
    <AssemblyOriginatorKeyFile>../../SharpCompress.snk</AssemblyOriginatorKeyFile>
    <SignAssembly>true</SignAssembly>
@@ -17,7 +17,7 @@
    <Copyright>Copyright (c) 2025  Adam Hathcock</Copyright>
    <GenerateAssemblyTitleAttribute>false</GenerateAssemblyTitleAttribute>
    <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
-    <Description>SharpCompress is a compression library for NET 4.8/NET 8.0/NET 10.0 that can unrar, decompress 7zip, decompress xz, zip/unzip, tar/untar lzip/unlzip, bzip2/unbzip2 and gzip/ungzip with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip is implemented.</Description>
+    <Description>SharpCompress is a compression library for NET Standard 2.0/NET 4.8/NET 4.8.1/NET 6.0/NET 8.0 that can unrar, decompress 7zip, decompress xz, zip/unzip, tar/untar lzip/unlzip, bzip2/unbzip2 and gzip/ungzip with forward-only reading and file random access APIs. Write support for zip/tar/bzip2/gzip is implemented.</Description>
    <PublishRepositoryUrl>true</PublishRepositoryUrl>
    <IncludeSymbols>true</IncludeSymbols>
    <DebugType>embedded</DebugType>
@@ -28,29 +28,31 @@
    <EmbedUntrackedSources>true</EmbedUntrackedSources>
    <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
  </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net8.0' Or '$(TargetFramework)' == 'net10.0' ">
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net8.0' ">
    <IsTrimmable>true</IsTrimmable>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0|AnyCPU'">
    <DefineConstants>$(DefineConstants);DEBUG_STREAMS</DefineConstants>
  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net10.0|AnyCPU'">
-    <DefineConstants>$(DefineConstants);DEBUG_STREAMS</DefineConstants>
-  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="ZstdSharp.Port" />
    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="All" />
  </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net8.0' Or '$(TargetFramework)' == 'net10.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net8.0'">
    <PackageReference Include="Microsoft.NET.ILLink.Tasks" PrivateAssets="All" />
  </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net48' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net48' Or '$(TargetFramework)' == 'net481' ">
    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" />
    <PackageReference Include="System.Text.Encoding.CodePages" />
    <PackageReference Include="System.Buffers" />
    <PackageReference Include="System.Memory" />
    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" PrivateAssets="All" />
  </ItemGroup>
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" />
+    <PackageReference Include="System.Text.Encoding.CodePages" />
+    <PackageReference Include="System.Memory" />
+  </ItemGroup>
  <ItemGroup>
    <None Include="..\..\README.md" Pack="true" PackagePath="\" />
  </ItemGroup>
--- a/src/SharpCompress/packages.lock.json
+++ b/src/SharpCompress/packages.lock.json
@@ -4,11 +4,11 @@
    ".NETFramework,Version=v4.8": {
      "Microsoft.Bcl.AsyncInterfaces": {
        "type": "Direct",
-        "requested": "[10.0.0, )",
-        "resolved": "10.0.0",
-        "contentHash": "vFuwSLj9QJBbNR0NeNO4YVASUbokxs+i/xbuu8B+Fs4FAZg5QaFa6eGrMaRqTzzNI5tAb97T7BhSxtLckFyiRA==",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "3WA9q9yVqJp222P3x1wYIGDAkpjAku0TMUaaQV22g6L67AI0LdOIrVS7Ht2vJfLHGSPVuqN94vIr15qn+HEkHw==",
        "dependencies": {
-          "System.Threading.Tasks.Extensions": "4.6.3"
+          "System.Threading.Tasks.Extensions": "4.5.4"
        }
      },
      "Microsoft.NETFramework.ReferenceAssemblies": {
@@ -49,13 +49,12 @@
      },
      "System.Text.Encoding.CodePages": {
        "type": "Direct",
-        "requested": "[10.0.0, )",
-        "resolved": "10.0.0",
-        "contentHash": "QLP54mIATaBpjGlsZIxga38VPk1G9js0Kw651B+bvrXi2kSgGZYrxJSpM3whhTZCBK4HEBHX3fzfDQMw7CXHGQ==",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "OZIsVplFGaVY90G2SbpgU7EnCoOO5pw1t4ic21dBF3/1omrJFpAGoNAVpPyMVOC90/hvgkGG3VFqR13YgZMQfg==",
        "dependencies": {
-          "System.Memory": "4.6.3",
-          "System.Runtime.CompilerServices.Unsafe": "6.1.2",
-          "System.ValueTuple": "4.6.1"
+          "System.Memory": "4.5.5",
+          "System.Runtime.CompilerServices.Unsafe": "6.0.0"
        }
      },
      "ZstdSharp.Port": {
@@ -96,25 +95,216 @@
      },
      "System.Threading.Tasks.Extensions": {
        "type": "Transitive",
-        "resolved": "4.6.3",
-        "contentHash": "7sCiwilJLYbTZELaKnc7RecBBXWXA+xMLQWZKWawBxYjp6DBlSE3v9/UcvKBvr1vv2tTOhipiogM8rRmxlhrVA==",
+        "resolved": "4.5.4",
+        "contentHash": "zteT+G8xuGu6mS+mzDzYXbzS7rd3K6Fjb9RiZlYlJPam2/hU7JCBZBVEcywNuR+oZ1ncTvc/cq0faRr3P01OVg==",
        "dependencies": {
+          "System.Runtime.CompilerServices.Unsafe": "4.5.3"
+        }
+      }
+    },
+    ".NETFramework,Version=v4.8.1": {
+      "Microsoft.Bcl.AsyncInterfaces": {
+        "type": "Direct",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "3WA9q9yVqJp222P3x1wYIGDAkpjAku0TMUaaQV22g6L67AI0LdOIrVS7Ht2vJfLHGSPVuqN94vIr15qn+HEkHw==",
+        "dependencies": {
+          "System.Threading.Tasks.Extensions": "4.5.4"
+        }
+      },
+      "Microsoft.NETFramework.ReferenceAssemblies": {
+        "type": "Direct",
+        "requested": "[1.0.3, )",
+        "resolved": "1.0.3",
+        "contentHash": "vUc9Npcs14QsyOD01tnv/m8sQUnGTGOw1BCmKcv77LBJY7OxhJ+zJF7UD/sCL3lYNFuqmQEVlkfS4Quif6FyYg==",
+        "dependencies": {
+          "Microsoft.NETFramework.ReferenceAssemblies.net481": "1.0.3"
+        }
+      },
+      "Microsoft.SourceLink.GitHub": {
+        "type": "Direct",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "G5q7OqtwIyGTkeIOAc3u2ZuV/kicQaec5EaRnc0pIeSnh9LUjj+PYQrJYBURvDt7twGl2PKA7nSN0kz1Zw5bnQ==",
+        "dependencies": {
+          "Microsoft.Build.Tasks.Git": "8.0.0",
+          "Microsoft.SourceLink.Common": "8.0.0"
+        }
+      },
+      "System.Buffers": {
+        "type": "Direct",
+        "requested": "[4.6.1, )",
+        "resolved": "4.6.1",
+        "contentHash": "N8GXpmiLMtljq7gwvyS+1QvKT/W2J8sNAvx+HVg4NGmsG/H+2k/y9QI23auLJRterrzCiDH+IWAw4V/GPwsMlw=="
+      },
+      "System.Memory": {
+        "type": "Direct",
+        "requested": "[4.6.3, )",
+        "resolved": "4.6.3",
+        "contentHash": "qdcDOgnFZY40+Q9876JUHnlHu7bosOHX8XISRoH94fwk6hgaeQGSgfZd8srWRZNt5bV9ZW2TljcegDNxsf+96A==",
+        "dependencies": {
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+          "System.Numerics.Vectors": "4.6.1",
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        }
      },
-      "System.ValueTuple": {
+      "System.Text.Encoding.CodePages": {
+        "type": "Direct",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "OZIsVplFGaVY90G2SbpgU7EnCoOO5pw1t4ic21dBF3/1omrJFpAGoNAVpPyMVOC90/hvgkGG3VFqR13YgZMQfg==",
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+        "requested": "[0.8.6, )",
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+        "contentHash": "Vv/20vgHS7VglVOVh8J3Iz/MA+VYKVRp9f7r2qiKBMuzviTOmocG70yq0Q8T5OTmCONkEAIJwETD1zhEfLkAXQ=="
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+        "requested": "[4.6.1, )",
+        "resolved": "4.6.1",
+        "contentHash": "N8GXpmiLMtljq7gwvyS+1QvKT/W2J8sNAvx+HVg4NGmsG/H+2k/y9QI23auLJRterrzCiDH+IWAw4V/GPwsMlw=="
+      }
+    },
+    "net6.0": {
      "Microsoft.SourceLink.GitHub": {
        "type": "Direct",
        "requested": "[8.0.0, )",
@@ -145,9 +335,9 @@
    "net8.0": {
      "Microsoft.NET.ILLink.Tasks": {
        "type": "Direct",
-        "requested": "[10.0.0, )",
-        "resolved": "10.0.0",
-        "contentHash": "kICGrGYEzCNI3wPzfEXcwNHgTvlvVn9yJDhSdRK+oZQy4jvYH529u7O0xf5ocQKzOMjfS07+3z9PKRIjrFMJDA=="
+        "requested": "[8.0.21, )",
+        "resolved": "8.0.21",
+        "contentHash": "s8H5PZQs50OcNkaB6Si54+v3GWM7vzs6vxFRMlD3aXsbM+aPCtod62gmK0BYWou9diGzmo56j8cIf/PziijDqQ=="
      },
      "Microsoft.SourceLink.GitHub": {
        "type": "Direct",
--- a/tests/SharpCompress.Performance/SharpCompress.Performance.csproj
+++ b/tests/SharpCompress.Performance/SharpCompress.Performance.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="JetBrains.Profiler.SelfApi" />
--- a/tests/SharpCompress.Performance/packages.lock.json
+++ b/tests/SharpCompress.Performance/packages.lock.json
@@ -1,7 +1,7 @@
 {
  "version": 2,
  "dependencies": {
-    "net10.0": {
+    "net8.0": {
      "JetBrains.Profiler.SelfApi": {
        "type": "Direct",
        "requested": "[2.5.14, )",
--- a/tests/SharpCompress.Test/ArchiveFactoryCompressedTarTests.cs
+++ b/tests/SharpCompress.Test/ArchiveFactoryCompressedTarTests.cs
@@ -1,63 +0,0 @@
-using System;
-using System.IO;
-using SharpCompress.Archives;
-using Xunit;
-
-namespace SharpCompress.Test;
-
-public class ArchiveFactoryCompressedTarTests : TestBase
-{
-    [Fact]
-    public void ArchiveFactory_Open_TarBz2_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2");
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(testFile);
-        });
-
-        Assert.Contains("tar.bz2", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarLz_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.lz");
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(testFile);
-        });
-
-        Assert.Contains("tar.lz", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarBz2Stream_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2");
-        using var stream = File.OpenRead(testFile);
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(stream);
-        });
-
-        Assert.Contains("tar.bz2", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-
-    [Fact]
-    public void ArchiveFactory_Open_TarLzStream_ThrowsHelpfulException()
-    {
-        var testFile = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.lz");
-        using var stream = File.OpenRead(testFile);
-        var exception = Assert.Throws<InvalidOperationException>(() =>
-        {
-            using var archive = ArchiveFactory.Open(stream);
-        });
-
-        Assert.Contains("tar.lz", exception.Message);
-        Assert.Contains("ReaderFactory", exception.Message);
-    }
-}
--- a/tests/SharpCompress.Test/ArchiveTests.cs
+++ b/tests/SharpCompress.Test/ArchiveTests.cs
@@ -134,6 +134,7 @@ public class ArchiveTests : ReaderTests
                {
                    foreach (var entry in archive.Entries.Where(entry => !entry.IsDirectory))
                    {
+                        Assert.False(entry.SupportsMultiThreading);
                        entry.WriteToDirectory(
                            SCRATCH_FILES_PATH,
                            new ExtractionOptions { ExtractFullPath = true, Overwrite = true }
@@ -266,6 +267,31 @@ public class ArchiveTests : ReaderTests
        VerifyFiles();
    }

+    protected async Task ArchiveFileRead_Multithreaded(
+        IArchiveFactory archiveFactory,
+        string testArchive,
+        ReaderOptions? readerOptions = null
+    )
+    {
+        testArchive = Path.Combine(TEST_ARCHIVES_PATH, testArchive);
+        var tasks = new List<Task>();
+        using (var archive = archiveFactory.Open(new FileInfo(testArchive), readerOptions))
+        {
+            Assert.True(archive.SupportsMultiThreading);
+            foreach (var entry in archive.Entries.Where(entry => !entry.IsDirectory))
+            {
+                Assert.True(entry.SupportsMultiThreading);
+                var t = entry.WriteToDirectoryAsync(
+                    SCRATCH_FILES_PATH,
+                    new ExtractionOptions { ExtractFullPath = true, Overwrite = true }
+                );
+                tasks.Add(t);
+            }
+        }
+        await Task.WhenAll(tasks);
+        VerifyFiles();
+    }
+
    protected void ArchiveFileRead(
        IArchiveFactory archiveFactory,
        string testArchive,
@@ -289,6 +315,11 @@ public class ArchiveTests : ReaderTests
    protected void ArchiveFileRead(string testArchive, ReaderOptions? readerOptions = null) =>
        ArchiveFileRead(ArchiveFactory.AutoFactory, testArchive, readerOptions);

+    protected Task ArchiveFileRead_Multithreaded(
+        string testArchive,
+        ReaderOptions? readerOptions = null
+    ) => ArchiveFileRead_Multithreaded(ArchiveFactory.AutoFactory, testArchive, readerOptions);
+
    protected void ArchiveFileSkip(
        string testArchive,
        string fileOrder,
--- a/tests/SharpCompress.Test/Rar/RarArchiveTests.cs
+++ b/tests/SharpCompress.Test/Rar/RarArchiveTests.cs
@@ -1,5 +1,6 @@
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Rar;
 using SharpCompress.Common;
@@ -292,9 +293,15 @@ public class RarArchiveTests : ArchiveTests
    [Fact]
    public void Rar_ArchiveFileRead() => ArchiveFileRead("Rar.rar");

+    [Fact]
+    public Task Rar_ArchiveFileRead_Multithreaded() => ArchiveFileRead_Multithreaded("Rar.rar");
+
    [Fact]
    public void Rar5_ArchiveFileRead() => ArchiveFileRead("Rar5.rar");

+    [Fact]
+    public Task Rar5_ArchiveFileRead_Multithreaded() => ArchiveFileRead_Multithreaded("Rar5.rar");
+
    [Fact]
    public void Rar_ArchiveFileRead_HasDirectories() =>
        DoRar_ArchiveFileRead_HasDirectories("Rar.rar");
@@ -359,6 +366,9 @@ public class RarArchiveTests : ArchiveTests
    [Fact]
    public void Rar2_ArchiveFileRead() => ArchiveFileRead("Rar2.rar");

+    [Fact]
+    public Task Rar2_ArchiveFileRead_Multithreaded() => ArchiveFileRead_Multithreaded("Rar2.rar");
+
    [Fact]
    public void Rar15_ArchiveFileRead()
    {
@@ -633,13 +643,4 @@ public class RarArchiveTests : ArchiveTests
            "Rar5.encrypted_filesOnly.rar",
            "Failure jpg exe Empty тест.txt jpg\\test.jpg exe\\test.exe"
        );
-
-    [Fact]
-    public void Rar_TestEncryptedDetection()
-    {
-        using var passwordProtectedFilesArchive = RarArchive.Open(
-            Path.Combine(TEST_ARCHIVES_PATH, "Rar.encrypted_filesOnly.rar")
-        );
-        Assert.True(passwordProtectedFilesArchive.IsEncrypted);
-    }
 }
--- a/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs
+++ b/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs
@@ -224,15 +224,6 @@ public class SevenZipArchiveTests : ArchiveTests
        );
    }

-    [Fact]
-    public void SevenZipArchive_TestEncryptedDetection()
-    {
-        using var passwordProtectedFilesArchive = SevenZipArchive.Open(
-            Path.Combine(TEST_ARCHIVES_PATH, "7Zip.encryptedFiles.7z")
-        );
-        Assert.True(passwordProtectedFilesArchive.IsEncrypted);
-    }
-
    [Fact]
    public void SevenZipArchive_TestSolidDetection()
    {
--- a/tests/SharpCompress.Test/SharpCompress.Test.csproj
+++ b/tests/SharpCompress.Test/SharpCompress.Test.csproj
@@ -1,12 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
-    <TargetFrameworks>net10.0;net48</TargetFrameworks>
+    <TargetFrameworks>net8.0;net48</TargetFrameworks>
    <AssemblyName>SharpCompress.Test</AssemblyName>
    <PackageId>SharpCompress.Test</PackageId>
    <AssemblyOriginatorKeyFile>SharpCompress.Test.snk</AssemblyOriginatorKeyFile>
    <SignAssembly>true</SignAssembly>
  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net10.0|AnyCPU'">
+  <PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0|AnyCPU'">
    <DefineConstants>$(DefineConstants);DEBUG_STREAMS</DefineConstants>
  </PropertyGroup>
  <PropertyGroup Condition="$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::Windows)))">
--- a/tests/SharpCompress.Test/Zip/ZipArchiveTests.cs
+++ b/tests/SharpCompress.Test/Zip/ZipArchiveTests.cs
@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Zip;
 using SharpCompress.Common;
@@ -88,6 +89,10 @@ public class ZipArchiveTests : ArchiveTests
    [Fact]
    public void Zip_Deflate_ArchiveFileRead() => ArchiveFileRead("Zip.deflate.zip");

+    [Fact]
+    public Task Zip_Deflate_ArchiveFileRead_Multithreaded() =>
+        ArchiveFileRead_Multithreaded("Zip.deflate.zip");
+
    [Fact]
    public void Zip_Deflate_ArchiveExtractToDirectory() =>
        ArchiveExtractToDirectory("Zip.deflate.zip");
--- a/tests/SharpCompress.Test/Zip/ZipReaderTests.cs
+++ b/tests/SharpCompress.Test/Zip/ZipReaderTests.cs
@@ -1,7 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using SharpCompress.Archives;
 using SharpCompress.Common;
 using SharpCompress.IO;
@@ -399,41 +397,4 @@ public class ZipReaderTests : ReaderTests
        Assert.Equal("second.txt", reader.Entry.Key);
        Assert.Equal(197, reader.Entry.Size);
    }
-
-    [Fact]
-    public void ZipReader_Returns_Same_Entries_As_ZipArchive()
-    {
-        // Verifies that ZipReader and ZipArchive return the same entries
-        // for standard single-volume ZIP files. ZipReader processes LocalEntry
-        // headers sequentially, while ZipArchive uses DirectoryEntry headers
-        // from the central directory and seeks to LocalEntry headers for data.
-        var testFiles = new[] { "Zip.none.zip", "Zip.deflate.zip", "Zip.none.issue86.zip" };
-
-        foreach (var testFile in testFiles)
-        {
-            var path = Path.Combine(TEST_ARCHIVES_PATH, testFile);
-
-            var readerKeys = new List<string>();
-            using (var stream = File.OpenRead(path))
-            using (var reader = ZipReader.Open(stream))
-            {
-                while (reader.MoveToNextEntry())
-                {
-                    readerKeys.Add(reader.Entry.Key!);
-                }
-            }
-
-            var archiveKeys = new List<string>();
-            using (var archive = Archives.Zip.ZipArchive.Open(path))
-            {
-                foreach (var entry in archive.Entries)
-                {
-                    archiveKeys.Add(entry.Key!);
-                }
-            }
-
-            Assert.Equal(archiveKeys.Count, readerKeys.Count);
-            Assert.Equal(archiveKeys.OrderBy(k => k), readerKeys.OrderBy(k => k));
-        }
-    }
 }
--- a/tests/SharpCompress.Test/Zip/ZipWriterTests.cs
+++ b/tests/SharpCompress.Test/Zip/ZipWriterTests.cs
@@ -1,7 +1,5 @@
-using System.IO;
 using System.Text;
 using SharpCompress.Common;
-using SharpCompress.Writers;
 using Xunit;

 namespace SharpCompress.Test.Zip;
@@ -11,42 +9,6 @@ public class ZipWriterTests : WriterTests
    public ZipWriterTests()
        : base(ArchiveType.Zip) { }

-    [Fact]
-    public void Zip_BZip2_Write_EmptyFile()
-    {
-        // Test that writing an empty file with BZip2 compression doesn't throw DivideByZeroException
-        using var memoryStream = new MemoryStream();
-        var options = new WriterOptions(CompressionType.BZip2)
-        {
-            ArchiveEncoding = new ArchiveEncoding { Default = new UTF8Encoding(false) },
-        };
-
-        using (var writer = WriterFactory.Open(memoryStream, ArchiveType.Zip, options))
-        {
-            writer.Write("test-folder/zero-byte-file.txt", Stream.Null);
-        }
-
-        Assert.True(memoryStream.Length > 0);
-    }
-
-    [Fact]
-    public void Zip_BZip2_Write_EmptyFolder()
-    {
-        // Test that writing an empty folder entry with BZip2 compression doesn't throw DivideByZeroException
-        using var memoryStream = new MemoryStream();
-        var options = new WriterOptions(CompressionType.BZip2)
-        {
-            ArchiveEncoding = new ArchiveEncoding { Default = new UTF8Encoding(false) },
-        };
-
-        using (var writer = WriterFactory.Open(memoryStream, ArchiveType.Zip, options))
-        {
-            writer.Write("test-empty-folder/", Stream.Null);
-        }
-
-        Assert.True(memoryStream.Length > 0);
-    }
-
    [Fact]
    public void Zip_Deflate_Write() =>
        Write(
--- a/tests/SharpCompress.Test/packages.lock.json
+++ b/tests/SharpCompress.Test/packages.lock.json
@@ -13,11 +13,11 @@
      },
      "Microsoft.NET.Test.Sdk": {
        "type": "Direct",
-        "requested": "[18.0.1, )",
-        "resolved": "18.0.1",
-        "contentHash": "WNpu6vI2rA0pXY4r7NKxCN16XRWl5uHu6qjuyVLoDo6oYEggIQefrMjkRuibQHm/NslIUNCcKftvoWAN80MSAg==",
+        "requested": "[18.0.0, )",
+        "resolved": "18.0.0",
+        "contentHash": "bvxj2Asb7nT+tqOFFerrhQeEjUYLwx0Poi0Rznu63WbqN+A4uDn1t5NWXfAOOQsF6lpmK6N2v+Vvgso7KWZS7g==",
        "dependencies": {
-          "Microsoft.CodeCoverage": "18.0.1"
+          "Microsoft.CodeCoverage": "18.0.0"
        }
      },
      "Microsoft.NETFramework.ReferenceAssemblies": {
@@ -29,12 +29,6 @@
          "Microsoft.NETFramework.ReferenceAssemblies.net48": "1.0.3"
        }
      },
-      "Mono.Posix.NETStandard": {
-        "type": "Direct",
-        "requested": "[1.0.0, )",
-        "resolved": "1.0.0",
-        "contentHash": "vSN/L1uaVwKsiLa95bYu2SGkF0iY3xMblTfxc8alSziPuVfJpj3geVqHGAA75J7cZkMuKpFVikz82Lo6y6LLdA=="
-      },
      "xunit": {
        "type": "Direct",
        "requested": "[2.9.3, )",
@@ -57,8 +51,8 @@
      },
      "Microsoft.CodeCoverage": {
        "type": "Transitive",
-        "resolved": "18.0.1",
-        "contentHash": "O+utSr97NAJowIQT/OVp3Lh9QgW/wALVTP4RG1m2AfFP4IyJmJz0ZBmFJUsRQiAPgq6IRC0t8AAzsiPIsaUDEA=="
+        "resolved": "18.0.0",
+        "contentHash": "DFPhMrsIofgJ1DDU3ModqqRArDm15/bNl4ecmcuBspZkZ4ONYnCC0R8U27WzK7cYv6r8l6Q/fRmvg7cb+I/dJA=="
      },
      "Microsoft.NETFramework.ReferenceAssemblies.net48": {
        "type": "Transitive",
@@ -98,17 +92,12 @@
      },
      "System.Threading.Tasks.Extensions": {
        "type": "Transitive",
-        "resolved": "4.6.3",
-        "contentHash": "7sCiwilJLYbTZELaKnc7RecBBXWXA+xMLQWZKWawBxYjp6DBlSE3v9/UcvKBvr1vv2tTOhipiogM8rRmxlhrVA==",
+        "resolved": "4.5.4",
+        "contentHash": "zteT+G8xuGu6mS+mzDzYXbzS7rd3K6Fjb9RiZlYlJPam2/hU7JCBZBVEcywNuR+oZ1ncTvc/cq0faRr3P01OVg==",
        "dependencies": {
-          "System.Runtime.CompilerServices.Unsafe": "6.1.2"
+          "System.Runtime.CompilerServices.Unsafe": "4.5.3"
        }
      },
-      "System.ValueTuple": {
-        "type": "Transitive",
-        "resolved": "4.6.1",
-        "contentHash": "+RJT4qaekpZ7DDLhf+LTjq+E48jieKiY9ulJ+BoxKmZblIJfIJT8Ufcaa/clQqnYvWs8jugfGSMu8ylS0caG0w=="
-      },
      "xunit.abstractions": {
        "type": "Transitive",
        "resolved": "2.0.3",
@@ -152,20 +141,20 @@
      "sharpcompress": {
        "type": "Project",
        "dependencies": {
-          "Microsoft.Bcl.AsyncInterfaces": "[10.0.0, )",
+          "Microsoft.Bcl.AsyncInterfaces": "[8.0.0, )",
          "System.Buffers": "[4.6.1, )",
          "System.Memory": "[4.6.3, )",
-          "System.Text.Encoding.CodePages": "[10.0.0, )",
+          "System.Text.Encoding.CodePages": "[8.0.0, )",
          "ZstdSharp.Port": "[0.8.6, )"
        }
      },
      "Microsoft.Bcl.AsyncInterfaces": {
        "type": "CentralTransitive",
-        "requested": "[10.0.0, )",
-        "resolved": "10.0.0",
-        "contentHash": "vFuwSLj9QJBbNR0NeNO4YVASUbokxs+i/xbuu8B+Fs4FAZg5QaFa6eGrMaRqTzzNI5tAb97T7BhSxtLckFyiRA==",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "3WA9q9yVqJp222P3x1wYIGDAkpjAku0TMUaaQV22g6L67AI0LdOIrVS7Ht2vJfLHGSPVuqN94vIr15qn+HEkHw==",
        "dependencies": {
-          "System.Threading.Tasks.Extensions": "4.6.3"
+          "System.Threading.Tasks.Extensions": "4.5.4"
        }
      },
      "System.Buffers": {
@@ -187,13 +176,12 @@
      },
      "System.Text.Encoding.CodePages": {
        "type": "CentralTransitive",
-        "requested": "[10.0.0, )",
-        "resolved": "10.0.0",
-        "contentHash": "QLP54mIATaBpjGlsZIxga38VPk1G9js0Kw651B+bvrXi2kSgGZYrxJSpM3whhTZCBK4HEBHX3fzfDQMw7CXHGQ==",
+        "requested": "[8.0.0, )",
+        "resolved": "8.0.0",
+        "contentHash": "OZIsVplFGaVY90G2SbpgU7EnCoOO5pw1t4ic21dBF3/1omrJFpAGoNAVpPyMVOC90/hvgkGG3VFqR13YgZMQfg==",
        "dependencies": {
-          "System.Memory": "4.6.3",
-          "System.Runtime.CompilerServices.Unsafe": "6.1.2",
-          "System.ValueTuple": "4.6.1"
+          "System.Memory": "4.5.5",
+          "System.Runtime.CompilerServices.Unsafe": "6.0.0"
        }
      },
      "ZstdSharp.Port": {
@@ -208,7 +196,7 @@
        }
      }
    },
-    "net10.0": {
+    "net8.0": {
      "AwesomeAssertions": {
        "type": "Direct",
        "requested": "[9.3.0, )",
@@ -217,12 +205,12 @@
      },
      "Microsoft.NET.Test.Sdk": {
        "type": "Direct",
-        "requested": "[18.0.1, )",
-        "resolved": "18.0.1",
-        "contentHash": "WNpu6vI2rA0pXY4r7NKxCN16XRWl5uHu6qjuyVLoDo6oYEggIQefrMjkRuibQHm/NslIUNCcKftvoWAN80MSAg==",
+        "requested": "[18.0.0, )",
+        "resolved": "18.0.0",
+        "contentHash": "bvxj2Asb7nT+tqOFFerrhQeEjUYLwx0Poi0Rznu63WbqN+A4uDn1t5NWXfAOOQsF6lpmK6N2v+Vvgso7KWZS7g==",
        "dependencies": {
-          "Microsoft.CodeCoverage": "18.0.1",
-          "Microsoft.TestPlatform.TestHost": "18.0.1"
+          "Microsoft.CodeCoverage": "18.0.0",
+          "Microsoft.TestPlatform.TestHost": "18.0.0"
        }
      },
      "Microsoft.NETFramework.ReferenceAssemblies": {
@@ -259,8 +247,8 @@
      },
      "Microsoft.CodeCoverage": {
        "type": "Transitive",
-        "resolved": "18.0.1",
-        "contentHash": "O+utSr97NAJowIQT/OVp3Lh9QgW/wALVTP4RG1m2AfFP4IyJmJz0ZBmFJUsRQiAPgq6IRC0t8AAzsiPIsaUDEA=="
+        "resolved": "18.0.0",
+        "contentHash": "DFPhMrsIofgJ1DDU3ModqqRArDm15/bNl4ecmcuBspZkZ4ONYnCC0R8U27WzK7cYv6r8l6Q/fRmvg7cb+I/dJA=="
      },
      "Microsoft.NETFramework.ReferenceAssemblies.net461": {
        "type": "Transitive",
@@ -269,18 +257,18 @@
      },
      "Microsoft.TestPlatform.ObjectModel": {
        "type": "Transitive",
-        "resolved": "18.0.1",
-        "contentHash": "qT/mwMcLF9BieRkzOBPL2qCopl8hQu6A1P7JWAoj/FMu5i9vds/7cjbJ/LLtaiwWevWLAeD5v5wjQJ/l6jvhWQ==",
+        "resolved": "18.0.0",
+        "contentHash": "Al/a99ymb8UdEEh6DKNiaoFn5i8fvX5PdM9LfU9Z/Q8NJrlyHHzF+LRHLbR+t89gRsJ2fFMpwYxgEn3eH1BQwA==",
        "dependencies": {
          "System.Reflection.Metadata": "8.0.0"
        }
      },
      "Microsoft.TestPlatform.TestHost": {
        "type": "Transitive",
-        "resolved": "18.0.1",
-        "contentHash": "uDJKAEjFTaa2wHdWlfo6ektyoh+WD4/Eesrwb4FpBFKsLGehhACVnwwTI4qD3FrIlIEPlxdXg3SyrYRIcO+RRQ==",
+        "resolved": "18.0.0",
+        "contentHash": "aAxE8Thr9ZHGrljOYaDeLJqitQi75iE4xeEFn6CEGFirlHSn1KwpKPniuEn6zCLZ90Z3XqNlrC3ZJTuvBov45w==",
        "dependencies": {
-          "Microsoft.TestPlatform.ObjectModel": "18.0.1",
+          "Microsoft.TestPlatform.ObjectModel": "18.0.0",
          "Newtonsoft.Json": "13.0.3"
        }
      },
--- a/tests/TestArchives/Archives/7Zip.encryptedFiles.7z
+++ b/tests/TestArchives/Archives/7Zip.encryptedFiles.7z
Author	SHA1	Message	Date
Adam Hathcock	2e301becb4	fmt	2025-11-27 15:50:25 +00:00
Adam Hathcock	2e7d4eb74b	first pass of making Rar multi-threaded	2025-11-27 15:49:29 +00:00
Adam Hathcock	5b2030bb98	add SupportsMultiThreading and IsMultiVolume to archive	2025-11-27 15:07:13 +00:00
Adam Hathcock	c1169539ea	add multi-threading test with fix	2025-11-27 12:22:49 +00:00
Adam Hathcock	8d2463f575	More test fixes and fmt	2025-11-27 12:14:35 +00:00
Adam Hathcock	af7e270b2d	added SupportsMultiThreading flag for File based Zips	2025-11-27 12:11:10 +00:00
Adam Hathcock	1984da6997	Merge remote-tracking branch 'origin/master' into adam/multi-threaded	2025-11-27 10:55:50 +00:00
Adam Hathcock	4536fddec2	intermediate commit: add zip/filepart that only deals with fileinfo	2025-10-29 13:02:27 +00:00