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

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

.editorconfig

@@ -368,6 +368,9 @@ dotnet_diagnostic.NX0001.severity = error
 dotnet_diagnostic.NX0002.severity = silent
 dotnet_diagnostic.NX0003.severity = silent
 
+dotnet_diagnostic.VSTHRD110.severity = error
+dotnet_diagnostic.VSTHRD107.severity = error
+
 ##########################################
 # Styles
 ##########################################

.gitignore

@@ -20,3 +20,7 @@ artifacts/
 
 .DS_Store
 *.snupkg
+
+# BenchmarkDotNet artifacts
+BenchmarkDotNet.Artifacts/
+**/BenchmarkDotNet.Artifacts/

AGENTS.md

@@ -14,6 +14,7 @@ SharpCompress is a pure C# compression library supporting multiple archive forma
 - Follow the existing code style and patterns in the codebase.
 
 ## General Instructions
+- **Agents should NEVER commit to git** - Agents should stage files and leave committing to the user. Only create commits when the user explicitly requests them.
 - Make only high confidence suggestions when reviewing code changes.
 - Write code with good maintainability practices, including comments on why certain design decisions were made.
 - Handle edge cases and write clear exception handling.
@@ -110,7 +111,7 @@ SharpCompress supports multiple archive and compression formats:
 - **Archive Formats**: Zip, Tar, 7Zip, Rar (read-only)
 - **Compression**: DEFLATE, BZip2, LZMA/LZMA2, PPMd, ZStandard (decompress only), Deflate64 (decompress only)
 - **Combined Formats**: Tar.GZip, Tar.BZip2, Tar.LZip, Tar.XZ, Tar.ZStandard
-- See FORMATS.md for complete format support matrix
+- See [docs/FORMATS.md](docs/FORMATS.md) for complete format support matrix
 
 ### Stream Handling Rules
 - **Disposal**: As of version 0.21, SharpCompress closes wrapped streams by default

Directory.Packages.props

@@ -1,5 +1,6 @@
 <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" />
@@ -13,8 +14,11 @@
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
-    <PackageVersion Include="Microsoft.NET.ILLink.Tasks" Version="10.0.0" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" />
+    <GlobalPackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
+    <GlobalPackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" />
+    <GlobalPackageReference
+      Include="Microsoft.VisualStudio.Threading.Analyzers"
+      Version="17.14.15"
+    />
   </ItemGroup>
 </Project>

README.md

@@ -4,7 +4,7 @@ SharpCompress is a compression library in pure C# for .NET Framework 4.8, .NET 8
 
 The major feature is support for non-seekable streams so large files can be processed on the fly (i.e. download stream).
 
-**NEW:** All I/O operations now support async/await for improved performance and scalability. See the [USAGE.md](USAGE.md#async-examples) for examples.
+**NEW:** All I/O operations now support async/await for improved performance and scalability. See the [USAGE.md](docs/USAGE.md#async-examples) for examples.
 
 GitHub Actions Build -
 [![SharpCompress](https://github.com/adamhathcock/sharpcompress/actions/workflows/dotnetcore.yml/badge.svg)](https://github.com/adamhathcock/sharpcompress/actions/workflows/dotnetcore.yml)
@@ -14,7 +14,7 @@ GitHub Actions Build -
 
 Post Issues on Github!
 
-Check the [Supported Formats](FORMATS.md) and [Basic Usage.](USAGE.md)
+Check the [Supported Formats](docs/FORMATS.md) and [Basic Usage.](docs/USAGE.md)
 
 ## Recommended Formats
 

build/packages.lock.json

@@ -14,11 +14,51 @@
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       },
+      "Microsoft.NETFramework.ReferenceAssemblies": {
+        "type": "Direct",
+        "requested": "[1.0.3, )",
+        "resolved": "1.0.3",
+        "contentHash": "vUc9Npcs14QsyOD01tnv/m8sQUnGTGOw1BCmKcv77LBJY7OxhJ+zJF7UD/sCL3lYNFuqmQEVlkfS4Quif6FyYg==",
+        "dependencies": {
+          "Microsoft.NETFramework.ReferenceAssemblies.net461": "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"
+        }
+      },
+      "Microsoft.VisualStudio.Threading.Analyzers": {
+        "type": "Direct",
+        "requested": "[17.14.15, )",
+        "resolved": "17.14.15",
+        "contentHash": "mXQPJsbuUD2ydq4/ffd8h8tSOFCXec+2xJOVNCvXjuMOq/+5EKHq3D2m2MC2+nUaXeFMSt66VS/J4HdKBixgcw=="
+      },
       "SimpleExec": {
         "type": "Direct",
         "requested": "[13.0.0, )",
         "resolved": "13.0.0",
         "contentHash": "zcCR1pupa1wI1VqBULRiQKeHKKZOuJhi/K+4V5oO+rHJZlaOD53ViFo1c3PavDoMAfSn/FAXGAWpPoF57rwhYg=="
+      },
+      "Microsoft.Build.Tasks.Git": {
+        "type": "Transitive",
+        "resolved": "8.0.0",
+        "contentHash": "bZKfSIKJRXLTuSzLudMFte/8CempWjVamNUR5eHJizsy+iuOuO/k2gnh7W0dHJmYY0tBf+gUErfluCv5mySAOQ=="
+      },
+      "Microsoft.NETFramework.ReferenceAssemblies.net461": {
+        "type": "Transitive",
+        "resolved": "1.0.3",
+        "contentHash": "AmOJZwCqnOCNp6PPcf9joyogScWLtwy0M1WkqfEQ0M9nYwyDD7EX9ZjscKS5iYnyvteX7kzSKFCKt9I9dXA6mA=="
+      },
+      "Microsoft.SourceLink.Common": {
+        "type": "Transitive",
+        "resolved": "8.0.0",
+        "contentHash": "dk9JPxTCIevS75HyEQ0E4OVAFhB2N+V9ShCXf8Q6FkUQZDkgLI12y679Nym1YqsiSysuQskT7Z+6nUf3yab6Vw=="
       }
     }
   }

docs/API.md

@@ -0,0 +1,489 @@
+# API Quick Reference
+
+Quick reference for commonly used SharpCompress APIs.
+
+## Factory Methods
+
+### Opening Archives
+
+```csharp
+// Auto-detect format
+using (var reader = ReaderFactory.Open(stream))
+{
+    // Works with Zip, Tar, GZip, Rar, 7Zip, etc.
+}
+
+// Specific format - Archive API
+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 
+{ 
+    Password = "password",
+    LeaveStreamOpen = true,
+    ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
+};
+using (var archive = ZipArchive.Open("encrypted.zip", options))
+```
+
+### Creating Archives
+
+```csharp
+// Writer Factory
+using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, CompressionType.Deflate))
+{
+    // Write entries
+}
+
+// Specific writer
+using (var archive = ZipArchive.Create())
+using (var archive = TarArchive.Create())
+using (var archive = GZipArchive.Create())
+
+// With options
+var options = new WriterOptions(CompressionType.Deflate) 
+{ 
+    CompressionLevel = 9,
+    LeaveStreamOpen = false
+};
+using (var archive = ZipArchive.Create())
+{
+    archive.SaveTo("output.zip", options);
+}
+```
+
+---
+
+## Archive API Methods
+
+### Reading/Extracting
+
+```csharp
+using (var archive = ZipArchive.Open("file.zip"))
+{
+    // Get all 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())
+    {
+        stream.CopyTo(outputStream);
+    }
+}
+
+// Async variants
+await archive.WriteToDirectoryAsync(@"C:\output", options, cancellationToken);
+using (var stream = await entry.OpenEntryStreamAsync(cancellationToken))
+{
+    // ...
+}
+```
+
+### Entry Properties
+
+```csharp
+foreach (var entry in archive.Entries)
+{
+    string name = entry.Key;              // Entry name/path
+    long size = entry.Size;               // Uncompressed size
+    long compressedSize = entry.CompressedSize;
+    bool isDir = entry.IsDirectory;
+    DateTime? modTime = entry.LastModifiedTime;
+    CompressionType compression = entry.CompressionType;
+}
+```
+
+### Creating Archives
+
+```csharp
+using (var archive = ZipArchive.Create())
+{
+    // Add file
+    archive.AddEntry("file.txt", "C:\\source\\file.txt");
+    
+    // Add multiple files
+    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)
+    {
+        CompressionLevel = 9,
+        LeaveStreamOpen = true
+    });
+}
+```
+
+---
+
+## Reader API Methods
+
+### Forward-Only Reading
+
+```csharp
+using (var stream = File.OpenRead("file.zip"))
+using (var reader = ReaderFactory.Open(stream))
+{
+    while (reader.MoveToNextEntry())
+    {
+        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())
+            {
+                entryStream.CopyTo(outputStream);
+            }
+        }
+    }
+}
+
+// Async variants
+while (await reader.MoveToNextEntryAsync())
+{
+    await reader.WriteEntryToFileAsync(@"C:\output\" + reader.Entry.Key, cancellationToken);
+}
+
+// Async extraction
+await reader.WriteAllToDirectoryAsync(@"C:\output", 
+    new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
+    cancellationToken);
+```
+
+---
+
+## Writer API Methods
+
+### Creating Archives (Streaming)
+
+```csharp
+using (var stream = File.Create("output.zip"))
+using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, CompressionType.Deflate))
+{
+    // Write single file
+    using (var fileStream = File.OpenRead("source.txt"))
+    {
+        writer.Write("entry.txt", fileStream, DateTime.Now);
+    }
+    
+    // Write directory
+    writer.WriteAll("C:\\source", "*", SearchOption.AllDirectories);
+    writer.WriteAll("C:\\source", "*.txt", SearchOption.TopDirectoryOnly);
+    
+    // Async variants
+    using (var fileStream = File.OpenRead("source.txt"))
+    {
+        await writer.WriteAsync("entry.txt", fileStream, DateTime.Now, cancellationToken);
+    }
+    
+    await writer.WriteAllAsync("C:\\source", "*", SearchOption.AllDirectories, cancellationToken);
+}
+```
+
+---
+
+## Common Options
+
+### ReaderOptions
+
+```csharp
+var options = new ReaderOptions
+{
+    Password = "password",                          // For encrypted archives
+    LeaveStreamOpen = true,                         // Don't close wrapped stream
+    ArchiveEncoding = new ArchiveEncoding          // Custom character encoding
+    {
+        Default = Encoding.GetEncoding(932)
+    }
+};
+using (var archive = ZipArchive.Open("file.zip", options))
+{
+    // ...
+}
+```
+
+### WriterOptions
+
+```csharp
+var options = new WriterOptions(CompressionType.Deflate)
+{
+    CompressionLevel = 9,                           // 0-9 for Deflate
+    LeaveStreamOpen = true,                         // Don't close stream
+};
+archive.SaveTo("output.zip", options);
+```
+
+### ExtractionOptions
+
+```csharp
+var options = new ExtractionOptions
+{
+    ExtractFullPath = true,                         // Recreate directory structure
+    Overwrite = true,                               // Overwrite existing files
+    PreserveFileTime = true                         // Keep original timestamps
+};
+archive.WriteToDirectory(@"C:\output", options);
+```
+
+---
+
+## Compression Types
+
+### Available Compressions
+
+```csharp
+// For creating archives
+CompressionType.None       // No compression (store)
+CompressionType.Deflate    // DEFLATE (default for ZIP/GZip)
+CompressionType.BZip2      // BZip2
+CompressionType.LZMA       // LZMA (for 7Zip, LZip, XZ)
+CompressionType.PPMd       // PPMd (for ZIP)
+CompressionType.Rar        // RAR compression (read-only)
+
+// 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
+
+```csharp
+ArchiveType.Zip
+ArchiveType.Tar
+ArchiveType.GZip
+ArchiveType.BZip2
+ArchiveType.Rar
+ArchiveType.SevenZip
+ArchiveType.XZ
+ArchiveType.ZStandard
+```
+
+---
+
+## Patterns & Examples
+
+### Extract with Error Handling
+
+```csharp
+try
+{
+    using (var archive = ZipArchive.Open("archive.zip", 
+        new ReaderOptions { Password = "password" }))
+    {
+        archive.WriteToDirectory(@"C:\output", new ExtractionOptions
+        {
+            ExtractFullPath = true,
+            Overwrite = true
+        });
+    }
+}
+catch (PasswordRequiredException)
+{
+    Console.WriteLine("Password required");
+}
+catch (InvalidArchiveException)
+{
+    Console.WriteLine("Archive is invalid");
+}
+catch (SharpCompressException ex)
+{
+    Console.WriteLine($"Error: {ex.Message}");
+}
+```
+
+### Extract with Progress
+
+```csharp
+var progress = new Progress<ProgressReport>(report =>
+{
+    Console.WriteLine($"Extracting {report.EntryPath}: {report.PercentComplete}%");
+});
+
+var options = new ReaderOptions { Progress = progress };
+using (var archive = ZipArchive.Open("archive.zip", options))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+```
+
+### Async Extract with Cancellation
+
+```csharp
+var cts = new CancellationTokenSource();
+cts.CancelAfter(TimeSpan.FromMinutes(5));
+
+try
+{
+    using (var archive = ZipArchive.Open("archive.zip"))
+    {
+        await archive.WriteToDirectoryAsync(@"C:\output",
+            new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
+            cts.Token);
+    }
+}
+catch (OperationCanceledException)
+{
+    Console.WriteLine("Extraction cancelled");
+}
+```
+
+### Create with Custom Compression
+
+```csharp
+using (var archive = ZipArchive.Create())
+{
+    archive.AddAllFromDirectory(@"D:\source");
+    
+    // Fastest
+    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 
+    });
+}
+```
+
+### Stream Processing (No File I/O)
+
+```csharp
+using (var outputStream = new MemoryStream())
+using (var archive = ZipArchive.Create())
+{
+    // Add content from memory
+    using (var contentStream = new MemoryStream(Encoding.UTF8.GetBytes("Hello")))
+    {
+        archive.AddEntry("file.txt", contentStream);
+    }
+    
+    // Save to memory
+    archive.SaveTo(outputStream, CompressionType.Deflate);
+    
+    // Get bytes
+    byte[] archiveBytes = outputStream.ToArray();
+}
+```
+
+### Extract Specific Files
+
+```csharp
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    var filesToExtract = new[] { "file1.txt", "file2.txt" };
+    
+    foreach (var entry in archive.Entries.Where(e => filesToExtract.Contains(e.Key)))
+    {
+        entry.WriteToFile(@"C:\output\" + entry.Key);
+    }
+}
+```
+
+### List Archive Contents
+
+```csharp
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    foreach (var entry in archive.Entries)
+    {
+        if (entry.IsDirectory)
+            Console.WriteLine($"[DIR]  {entry.Key}");
+        else
+            Console.WriteLine($"[FILE] {entry.Key} ({entry.Size} bytes)");
+    }
+}
+```
+
+---
+
+## Common Mistakes
+
+### ✗ Wrong - Stream not disposed
+
+```csharp
+var stream = File.OpenRead("archive.zip");
+var archive = ZipArchive.Open(stream);
+archive.WriteToDirectory(@"C:\output");
+// stream not disposed - leaked resource
+```
+
+### ✓ Correct - Using blocks
+
+```csharp
+using (var stream = File.OpenRead("archive.zip"))
+using (var archive = ZipArchive.Open(stream))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+// Both properly disposed
+```
+
+### ✗ Wrong - Mixing API styles
+
+```csharp
+// Loading entire archive then iterating
+using (var archive = ZipArchive.Open("large.zip"))
+{
+    var entries = archive.Entries.ToList();  // Loads all in memory
+    foreach (var e in entries)
+    {
+        e.WriteToFile(...);  // Then extracts each
+    }
+}
+```
+
+### ✓ Correct - Use Reader for large files
+
+```csharp
+// Streaming iteration
+using (var stream = File.OpenRead("large.zip"))
+using (var reader = ReaderFactory.Open(stream))
+{
+    while (reader.MoveToNextEntry())
+    {
+        reader.WriteEntryToDirectory(@"C:\output");
+    }
+}
+```
+
+---
+
+## Related Documentation
+
+- [USAGE.md](USAGE.md) - Complete code examples
+- [FORMATS.md](FORMATS.md) - Supported formats
+- [PERFORMANCE.md](PERFORMANCE.md) - API selection guide

docs/ARCHITECTURE.md

@@ -0,0 +1,659 @@
+# SharpCompress Architecture Guide
+
+This guide explains the internal architecture and design patterns of SharpCompress for contributors.
+
+## Overview
+
+SharpCompress is organized into three main layers:
+
+```
+┌─────────────────────────────────────────┐
+│     User-Facing APIs (Top Layer)        │
+│  Archive, Reader, Writer Factories      │
+├─────────────────────────────────────────┤
+│     Format-Specific Implementations     │
+│  ZipArchive, TarReader, GZipWriter,     │
+│  RarArchive, SevenZipArchive, etc.      │
+├─────────────────────────────────────────┤
+│     Compression & Crypto (Bottom Layer) │
+│  Deflate, LZMA, BZip2, AES, CRC32       │
+└─────────────────────────────────────────┘
+```
+
+---
+
+## Directory Structure
+
+### `src/SharpCompress/`
+
+#### `Archives/` - Archive Implementations
+Contains `IArchive` implementations for seekable, random-access APIs.
+
+**Key Files:**
+- `AbstractArchive.cs` - Base class for all archives
+- `IArchive.cs` - Archive interface definition
+- `ArchiveFactory.cs` - Factory for opening archives
+- Format-specific: `ZipArchive.cs`, `TarArchive.cs`, `RarArchive.cs`, `SevenZipArchive.cs`, `GZipArchive.cs`
+
+**Use Archive API when:**
+- Stream is seekable (file, memory)
+- Need random access to entries
+- Archive fits in memory
+- Simplicity is important
+
+#### `Readers/` - Reader Implementations
+Contains `IReader` implementations for forward-only, non-seekable APIs.
+
+**Key Files:**
+- `AbstractReader.cs` - Base reader class
+- `IReader.cs` - Reader interface
+- `ReaderFactory.cs` - Auto-detection factory
+- `ReaderOptions.cs` - Configuration for readers
+- Format-specific: `ZipReader.cs`, `TarReader.cs`, `GZipReader.cs`, `RarReader.cs`, etc.
+
+**Use Reader API when:**
+- Stream is non-seekable (network, pipe, compressed)
+- Processing large files
+- Memory is limited
+- Forward-only processing is acceptable
+
+#### `Writers/` - Writer Implementations
+Contains `IWriter` implementations for forward-only writing.
+
+**Key Files:**
+- `AbstractWriter.cs` - Base writer class
+- `IWriter.cs` - Writer interface
+- `WriterFactory.cs` - Factory for creating writers
+- `WriterOptions.cs` - Configuration for writers
+- Format-specific: `ZipWriter.cs`, `TarWriter.cs`, `GZipWriter.cs`
+
+#### `Factories/` - Format Detection
+Factory classes for auto-detecting archive format and creating appropriate readers/writers.
+
+**Key Files:**
+- `Factory.cs` - Base factory class
+- `IFactory.cs` - Factory interface
+- Format-specific: `ZipFactory.cs`, `TarFactory.cs`, `RarFactory.cs`, etc.
+
+**How It Works:**
+1. `ReaderFactory.Open(stream)` probes stream signatures
+2. Identifies format by magic bytes
+3. Creates appropriate reader instance
+4. Returns generic `IReader` interface
+
+#### `Common/` - Shared Types
+Common types, options, and enumerations used across formats.
+
+**Key Files:**
+- `IEntry.cs` - Entry interface (file within archive)
+- `Entry.cs` - Entry implementation
+- `ArchiveType.cs` - Enum for archive formats
+- `CompressionType.cs` - Enum for compression methods
+- `ArchiveEncoding.cs` - Character encoding configuration
+- `ExtractionOptions.cs` - Extraction configuration
+- Format-specific headers: `Zip/Headers/`, `Tar/Headers/`, `Rar/Headers/`, etc.
+
+#### `Compressors/` - Compression Algorithms
+Low-level compression streams implementing specific algorithms.
+
+**Algorithms:**
+- `Deflate/` - DEFLATE compression (Zip default)
+- `BZip2/` - BZip2 compression
+- `LZMA/` - LZMA compression (7Zip, XZ, LZip)
+- `PPMd/` - Prediction by Partial Matching (Zip, 7Zip)
+- `ZStandard/` - ZStandard compression (decompression only)
+- `Xz/` - XZ format (decompression only)
+- `Rar/` - RAR-specific unpacking
+- `Arj/`, `Arc/`, `Ace/` - Legacy format decompression
+- `Filters/` - BCJ/BCJ2 filters for executable compression
+
+**Each Compressor:**
+- Implements a `Stream` subclass
+- Provides both compression and decompression
+- Some are read-only (decompression only)
+
+#### `Crypto/` - Encryption & Hashing
+Cryptographic functions and stream wrappers.
+
+**Key Files:**
+- `Crc32Stream.cs` - CRC32 calculation wrapper
+- `BlockTransformer.cs` - Block cipher transformations
+- AES, PKWare, WinZip encryption implementations
+
+#### `IO/` - Stream Utilities
+Stream wrappers and utilities.
+
+**Key Classes:**
+- `SharpCompressStream` - Base stream class
+- `ProgressReportingStream` - Progress tracking wrapper
+- `MarkingBinaryReader` - Binary reader with position marks
+- `BufferedSubStream` - Buffered read-only substream
+- `ReadOnlySubStream` - Read-only view of parent stream
+- `NonDisposingStream` - Prevents wrapped stream disposal
+
+---
+
+## Design Patterns
+
+### 1. Factory Pattern
+
+**Purpose:** Auto-detect format and create appropriate reader/writer.
+
+**Example:**
+```csharp
+// User calls factory
+using (var reader = ReaderFactory.Open(stream))  // Returns IReader
+{
+    while (reader.MoveToNextEntry())
+    {
+        // Process entry
+    }
+}
+
+// Behind the scenes:
+// 1. Factory.Open() probes stream signatures
+// 2. Detects format (Zip, Tar, Rar, etc.)
+// 3. Creates appropriate reader (ZipReader, TarReader, etc.)
+// 4. Returns as generic IReader interface
+```
+
+**Files:**
+- `src/SharpCompress/Factories/ReaderFactory.cs`
+- `src/SharpCompress/Factories/WriterFactory.cs`
+- `src/SharpCompress/Factories/ArchiveFactory.cs`
+
+### 2. Strategy Pattern
+
+**Purpose:** Encapsulate compression algorithms as swappable strategies.
+
+**Example:**
+```csharp
+// Different compression strategies
+CompressionType.Deflate     // DEFLATE
+CompressionType.BZip2       // BZip2
+CompressionType.LZMA        // LZMA
+CompressionType.PPMd        // PPMd
+
+// Writer uses strategy pattern
+var archive = ZipArchive.Create();
+archive.SaveTo("output.zip", CompressionType.Deflate);   // Use Deflate
+archive.SaveTo("output.bz2", CompressionType.BZip2);    // Use BZip2
+```
+
+**Files:**
+- `src/SharpCompress/Compressors/` - Strategy implementations
+
+### 3. Decorator Pattern
+
+**Purpose:** Wrap streams with additional functionality.
+
+**Example:**
+```csharp
+// Progress reporting decorator
+var progressStream = new ProgressReportingStream(baseStream, progressReporter);
+progressStream.Read(buffer, 0, buffer.Length);  // Reports progress
+
+// Non-disposing decorator
+var nonDisposingStream = new NonDisposingStream(baseStream);
+using (var compressor = new DeflateStream(nonDisposingStream))
+{
+    // baseStream won't be disposed when compressor is disposed
+}
+```
+
+**Files:**
+- `src/SharpCompress/IO/ProgressReportingStream.cs`
+- `src/SharpCompress/IO/NonDisposingStream.cs`
+
+### 4. Template Method Pattern
+
+**Purpose:** Define algorithm skeleton in base class, let subclasses fill details.
+
+**Example:**
+```csharp
+// AbstractArchive defines common archive operations
+public abstract class AbstractArchive : IArchive
+{
+    // Template methods
+    public virtual void WriteToDirectory(string destinationDirectory, ExtractionOptions options)
+    {
+        // Common extraction logic
+        foreach (var entry in Entries)
+        {
+            // Call subclass method
+            entry.WriteToFile(destinationPath, options);
+        }
+    }
+    
+    // Subclasses override format-specific details
+    protected abstract Entry CreateEntry(EntryData data);
+}
+```
+
+**Files:**
+- `src/SharpCompress/Archives/AbstractArchive.cs`
+- `src/SharpCompress/Readers/AbstractReader.cs`
+
+### 5. Iterator Pattern
+
+**Purpose:** Provide sequential access to entries.
+
+**Example:**
+```csharp
+// Archive API - provides collection
+IEnumerable<IEntry> entries = archive.Entries;
+foreach (var entry in entries)
+{
+    // Random access - entries already in memory
+}
+
+// Reader API - provides iterator
+IReader reader = ReaderFactory.Open(stream);
+while (reader.MoveToNextEntry())
+{
+    // Forward-only iteration - one entry at a time
+    var entry = reader.Entry;
+}
+```
+
+---
+
+## Key Interfaces
+
+### IArchive - Random Access API
+
+```csharp
+public interface IArchive : IDisposable
+{
+    IEnumerable<IEntry> Entries { get; }
+    
+    void WriteToDirectory(string destinationDirectory, 
+                         ExtractionOptions options = null);
+    
+    IEntry FirstOrDefault(Func<IEntry, bool> predicate);
+    
+    // ... format-specific methods
+}
+```
+
+**Implementations:** `ZipArchive`, `TarArchive`, `RarArchive`, `SevenZipArchive`, `GZipArchive`
+
+### IReader - Forward-Only API
+
+```csharp
+public interface IReader : IDisposable
+{
+    IEntry Entry { get; }
+    
+    bool MoveToNextEntry();
+    
+    void WriteEntryToDirectory(string destinationDirectory,
+                              ExtractionOptions options = null);
+    
+    Stream OpenEntryStream();
+    
+    // ... async variants
+}
+```
+
+**Implementations:** `ZipReader`, `TarReader`, `RarReader`, `GZipReader`, etc.
+
+### IWriter - Writing API
+
+```csharp
+public interface IWriter : IDisposable
+{
+    void Write(string entryPath, Stream source, 
+              DateTime? modificationTime = null);
+    
+    void WriteAll(string sourceDirectory, string searchPattern,
+                 SearchOption searchOption);
+    
+    // ... async variants
+}
+```
+
+**Implementations:** `ZipWriter`, `TarWriter`, `GZipWriter`
+
+### IEntry - Archive Entry
+
+```csharp
+public interface IEntry
+{
+    string Key { get; }
+    uint Size { get; }
+    uint CompressedSize { get; }
+    bool IsDirectory { get; }
+    DateTime? LastModifiedTime { get; }
+    CompressionType CompressionType { get; }
+    
+    void WriteToFile(string fullPath, ExtractionOptions options = null);
+    void WriteToStream(Stream destinationStream);
+    Stream OpenEntryStream();
+    
+    // ... async variants
+}
+```
+
+---
+
+## Adding Support for a New Format
+
+### Step 1: Understand the Format
+- Research format specification
+- Understand compression/encryption used
+- Study existing similar formats in codebase
+
+### Step 2: Create Format Structure Classes
+
+**Create:** `src/SharpCompress/Common/NewFormat/`
+
+```csharp
+// Headers and data structures
+public class NewFormatHeader
+{
+    public uint Magic { get; set; }
+    public ushort Version { get; set; }
+    // ... other fields
+    
+    public static NewFormatHeader Read(BinaryReader reader)
+    {
+        // Deserialize from binary
+    }
+}
+
+public class NewFormatEntry
+{
+    public string FileName { get; set; }
+    public uint CompressedSize { get; set; }
+    public uint UncompressedSize { get; set; }
+    // ... other fields
+}
+```
+
+### Step 3: Create Archive Implementation
+
+**Create:** `src/SharpCompress/Archives/NewFormat/NewFormatArchive.cs`
+
+```csharp
+public class NewFormatArchive : AbstractArchive
+{
+    private NewFormatHeader _header;
+    private List<NewFormatEntry> _entries;
+    
+    public static NewFormatArchive Open(Stream stream)
+    {
+        var archive = new NewFormatArchive();
+        archive._header = NewFormatHeader.Read(stream);
+        archive.LoadEntries(stream);
+        return archive;
+    }
+    
+    public override IEnumerable<IEntry> Entries => _entries.Select(e => new Entry(e));
+    
+    protected override Stream OpenEntryStream(Entry entry)
+    {
+        // Return decompressed stream for entry
+    }
+    
+    // ... other abstract method implementations
+}
+```
+
+### Step 4: Create Reader Implementation
+
+**Create:** `src/SharpCompress/Readers/NewFormat/NewFormatReader.cs`
+
+```csharp
+public class NewFormatReader : AbstractReader
+{
+    private NewFormatHeader _header;
+    private BinaryReader _reader;
+    
+    public NewFormatReader(Stream stream)
+    {
+        _reader = new BinaryReader(stream);
+        _header = NewFormatHeader.Read(_reader);
+    }
+    
+    public override bool MoveToNextEntry()
+    {
+        // Read next entry header
+        if (!_reader.BaseStream.CanRead) return false;
+        
+        var entryData = NewFormatEntry.Read(_reader);
+        // ... set this.Entry
+        return entryData != null;
+    }
+    
+    // ... other abstract method implementations
+}
+```
+
+### Step 5: Create Factory
+
+**Create:** `src/SharpCompress/Factories/NewFormatFactory.cs`
+
+```csharp
+public class NewFormatFactory : Factory, IArchiveFactory, IReaderFactory
+{
+    // Archive format magic bytes (signature)
+    private static readonly byte[] NewFormatSignature = new byte[] { 0x4E, 0x46 };  // "NF"
+    
+    public static NewFormatFactory Instance { get; } = new();
+    
+    public IArchive CreateArchive(Stream stream) 
+        => NewFormatArchive.Open(stream);
+    
+    public IReader CreateReader(Stream stream, ReaderOptions options)
+        => new NewFormatReader(stream) { Options = options };
+    
+    public bool Matches(Stream stream, ReadOnlySpan<byte> signature) 
+        => signature.StartsWith(NewFormatSignature);
+}
+```
+
+### Step 6: Register Factory
+
+**Update:** `src/SharpCompress/Factories/ArchiveFactory.cs`
+
+```csharp
+private static readonly IFactory[] Factories = 
+{
+    ZipFactory.Instance,
+    TarFactory.Instance,
+    RarFactory.Instance,
+    SevenZipFactory.Instance,
+    GZipFactory.Instance,
+    NewFormatFactory.Instance,  // Add here
+    // ... other factories
+};
+```
+
+### Step 7: Add Tests
+
+**Create:** `tests/SharpCompress.Test/NewFormat/NewFormatTests.cs`
+
+```csharp
+public class NewFormatTests : TestBase
+{
+    [Fact]
+    public void NewFormat_Extracts_Successfully()
+    {
+        var archivePath = Path.Combine(TEST_ARCHIVES_PATH, "archive.newformat");
+        using (var archive = NewFormatArchive.Open(archivePath))
+        {
+            archive.WriteToDirectory(SCRATCH_FILES_PATH);
+            // Assert extraction
+        }
+    }
+    
+    [Fact]
+    public void NewFormat_Reader_Works()
+    {
+        var archivePath = Path.Combine(TEST_ARCHIVES_PATH, "archive.newformat");
+        using (var stream = File.OpenRead(archivePath))
+        using (var reader = new NewFormatReader(stream))
+        {
+            Assert.True(reader.MoveToNextEntry());
+            Assert.NotNull(reader.Entry);
+        }
+    }
+}
+```
+
+### Step 8: Add Test Archives
+
+Place test files in `tests/TestArchives/Archives/NewFormat/` directory.
+
+### Step 9: Document
+
+Update `docs/FORMATS.md` with format support information.
+
+---
+
+## Compression Algorithm Implementation
+
+### Creating a New Compression Stream
+
+**Example:** Creating `CustomStream` for a custom compression algorithm
+
+```csharp
+public class CustomStream : Stream
+{
+    private readonly Stream _baseStream;
+    private readonly bool _leaveOpen;
+    
+    public CustomStream(Stream baseStream, bool leaveOpen = false)
+    {
+        _baseStream = baseStream;
+        _leaveOpen = leaveOpen;
+    }
+    
+    public override int Read(byte[] buffer, int offset, int count)
+    {
+        // Decompress data from _baseStream into buffer
+        // Return number of decompressed bytes
+    }
+    
+    public override void Write(byte[] buffer, int offset, int count)
+    {
+        // Compress data from buffer into _baseStream
+    }
+    
+    protected override void Dispose(bool disposing)
+    {
+        if (disposing && !_leaveOpen)
+        {
+            _baseStream?.Dispose();
+        }
+        base.Dispose(disposing);
+    }
+}
+```
+
+---
+
+## Stream Handling Best Practices
+
+### Disposal Pattern
+
+```csharp
+// Correct: Nested using blocks
+using (var fileStream = File.OpenRead("archive.zip"))
+using (var archive = ZipArchive.Open(fileStream))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+// Both archive and fileStream properly disposed
+
+// Correct: Using with options
+var options = new ReaderOptions { LeaveStreamOpen = true };
+var stream = File.OpenRead("archive.zip");
+using (var archive = ZipArchive.Open(stream, options))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+stream.Dispose();  // Manually dispose if LeaveStreamOpen = true
+```
+
+### NonDisposingStream Wrapper
+
+```csharp
+// Prevent unwanted stream closure
+var baseStream = File.OpenRead("data.bin");
+var nonDisposing = new NonDisposingStream(baseStream);
+
+using (var compressor = new DeflateStream(nonDisposing))
+{
+    // Compressor won't close baseStream when disposed
+}
+
+// baseStream still usable
+baseStream.Position = 0;  // Works
+baseStream.Dispose();  // Manual disposal
+```
+
+---
+
+## Performance Considerations
+
+### Memory Efficiency
+
+1. **Avoid loading entire archive in memory** - Use Reader API for large files
+2. **Process entries sequentially** - Especially for solid archives
+3. **Use appropriate buffer sizes** - Larger buffers for network I/O
+4. **Dispose streams promptly** - Free resources when done
+
+### Algorithm Selection
+
+1. **Archive API** - Fast for small archives with random access
+2. **Reader API** - Efficient for large files or streaming
+3. **Solid archives** - Sequential extraction much faster
+4. **Compression levels** - Trade-off between speed and size
+
+---
+
+## Testing Guidelines
+
+### Test Coverage
+
+1. **Happy path** - Normal extraction works
+2. **Edge cases** - Empty archives, single file, many files
+3. **Corrupted data** - Handle gracefully
+4. **Error cases** - Missing passwords, unsupported compression
+5. **Async operations** - Both sync and async code paths
+
+### Test Archives
+
+- Use `tests/TestArchives/` for test data
+- Create format-specific subdirectories
+- Include encrypted, corrupted, and edge case archives
+- Don't recreate existing archives
+
+### Test Patterns
+
+```csharp
+[Fact]
+public void Archive_Extraction_Works()
+{
+    // Arrange
+    var testArchive = Path.Combine(TEST_ARCHIVES_PATH, "test.zip");
+    
+    // Act
+    using (var archive = ZipArchive.Open(testArchive))
+    {
+        archive.WriteToDirectory(SCRATCH_FILES_PATH);
+    }
+    
+    // Assert
+    Assert.True(File.Exists(Path.Combine(SCRATCH_FILES_PATH, "file.txt")));
+}
+```
+
+---
+
+## Related Documentation
+
+- [AGENTS.md](../AGENTS.md) - Development guidelines
+- [FORMATS.md](FORMATS.md) - Supported formats

docs/ENCODING.md

@@ -0,0 +1,610 @@
+# SharpCompress Character Encoding Guide
+
+This guide explains how SharpCompress handles character encoding for archive entries (filenames, comments, etc.).
+
+## Overview
+
+Most archive formats store filenames and metadata as bytes. SharpCompress must convert these bytes to strings using the appropriate character encoding.
+
+**Common Problem:** Archives created on systems with non-UTF8 encodings (especially Japanese, Chinese systems) appear with corrupted filenames when extracted on systems that assume UTF8.
+
+---
+
+## ArchiveEncoding Class
+
+### Basic Usage
+
+```csharp
+using SharpCompress.Common;
+using SharpCompress.Readers;
+
+// Configure encoding before opening archive
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding(932)  // cp932 for Japanese
+    }
+};
+
+using (var archive = ZipArchive.Open("japanese.zip", options))
+{
+    foreach (var entry in archive.Entries)
+    {
+        Console.WriteLine(entry.Key);  // Now shows correct characters
+    }
+}
+```
+
+### ArchiveEncoding Properties
+
+| Property | Purpose |
+|----------|---------|
+| `Default` | Default encoding for filenames (fallback) |
+| `CustomDecoder` | Custom decoding function for special cases |
+
+### Setting for Different APIs
+
+**Archive API:**
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
+};
+using (var archive = ZipArchive.Open("file.zip", options))
+{
+    // Use archive with correct encoding
+}
+```
+
+**Reader API:**
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
+};
+using (var stream = File.OpenRead("file.zip"))
+using (var reader = ReaderFactory.Open(stream, options))
+{
+    while (reader.MoveToNextEntry())
+    {
+        // Filenames decoded correctly
+    }
+}
+```
+
+---
+
+## Common Encodings
+
+### Asian Encodings
+
+#### cp932 (Japanese)
+```csharp
+// Windows-31J, Shift-JIS variant used on Japanese Windows
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding(932)
+    }
+};
+using (var archive = ZipArchive.Open("japanese.zip", options))
+{
+    // Correctly decodes Japanese filenames
+}
+```
+
+**When to use:**
+- Archives from Japanese Windows systems
+- Files with Japanese characters in names
+
+#### gb2312 (Simplified Chinese)
+```csharp
+// Simplified Chinese
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("gb2312")
+    }
+};
+```
+
+#### gbk (Extended Simplified Chinese)
+```csharp
+// Extended Simplified Chinese (more characters than gb2312)
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("gbk")
+    }
+};
+```
+
+#### big5 (Traditional Chinese)
+```csharp
+// Traditional Chinese (Taiwan, Hong Kong)
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("big5")
+    }
+};
+```
+
+#### euc-jp (Japanese, Unix)
+```csharp
+// Extended Unix Code for Japanese
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("eucjp")
+    }
+};
+```
+
+#### euc-kr (Korean)
+```csharp
+// Extended Unix Code for Korean
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("euc-kr")
+    }
+};
+```
+
+### Western European Encodings
+
+#### iso-8859-1 (Latin-1)
+```csharp
+// Western European (includes accented characters)
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("iso-8859-1")
+    }
+};
+```
+
+**When to use:**
+- Archives from French, German, Spanish systems
+- Files with accented characters (é, ñ, ü, etc.)
+
+#### cp1252 (Windows-1252)
+```csharp
+// Windows Western European
+// Very similar to iso-8859-1 but with additional printable characters
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("cp1252")
+    }
+};
+```
+
+**When to use:**
+- Archives from older Western European Windows systems
+- Files with smart quotes and other Windows-specific characters
+
+#### iso-8859-15 (Latin-9)
+```csharp
+// Western European with Euro symbol support
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("iso-8859-15")
+    }
+};
+```
+
+### Cyrillic Encodings
+
+#### cp1251 (Windows Cyrillic)
+```csharp
+// Russian, Serbian, Bulgarian, etc.
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("cp1251")
+    }
+};
+```
+
+#### koi8-r (KOI8 Russian)
+```csharp
+// Russian (Unix standard)
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("koi8-r")
+    }
+};
+```
+
+### UTF Encodings (Modern)
+
+#### UTF-8 (Default)
+```csharp
+// Modern standard - usually correct for new archives
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.UTF8
+    }
+};
+```
+
+#### UTF-16
+```csharp
+// Unicode - rarely used in archives
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.Unicode
+    }
+};
+```
+
+---
+
+## Encoding Auto-Detection
+
+SharpCompress attempts to auto-detect encoding, but this isn't always reliable:
+
+```csharp
+// Auto-detection (default)
+using (var archive = ZipArchive.Open("file.zip"))  // Uses UTF8 by default
+{
+    // May show corrupted characters if archive uses different encoding
+}
+
+// Explicit encoding (more reliable)
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding { Default = Encoding.GetEncoding(932) }
+};
+using (var archive = ZipArchive.Open("file.zip", options))
+{
+    // Correct characters displayed
+}
+```
+
+### When Manual Override is Needed
+
+| Situation | Solution |
+|-----------|----------|
+| Archive shows corrupted characters | Specify the encoding explicitly |
+| Archives from specific region | Use that region's encoding |
+| Mixed encodings in archive | Use CustomDecoder |
+| Testing with international files | Try different encodings |
+
+---
+
+## Custom Decoder
+
+For complex scenarios where a single encoding isn't sufficient:
+
+### Basic Custom Decoder
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding
+    {
+        CustomDecoder = (data, offset, length) =>
+        {
+            // Custom decoding logic
+            var bytes = new byte[length];
+            Array.Copy(data, offset, bytes, 0, length);
+            
+            // Try UTF8 first
+            try
+            {
+                return Encoding.UTF8.GetString(bytes);
+            }
+            catch
+            {
+                // Fallback to cp932 if UTF8 fails
+                return Encoding.GetEncoding(932).GetString(bytes);
+            }
+        }
+    }
+};
+
+using (var archive = ZipArchive.Open("mixed.zip", options))
+{
+    foreach (var entry in archive.Entries)
+    {
+        Console.WriteLine(entry.Key);  // Uses custom decoder
+    }
+}
+```
+
+### Advanced: Detect Encoding by Content
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding
+    {
+        CustomDecoder = DetectAndDecode
+    }
+};
+
+private static string DetectAndDecode(byte[] data, int offset, int length)
+{
+    var bytes = new byte[length];
+    Array.Copy(data, offset, bytes, 0, length);
+    
+    // Try UTF8 (most modern archives)
+    try
+    {
+        var str = Encoding.UTF8.GetString(bytes);
+        // Verify it decoded correctly (no replacement characters)
+        if (!str.Contains('\uFFFD'))
+            return str;
+    }
+    catch { }
+    
+    // Try cp932 (Japanese)
+    try
+    {
+        var str = Encoding.GetEncoding(932).GetString(bytes);
+        if (!str.Contains('\uFFFD'))
+            return str;
+    }
+    catch { }
+    
+    // Fallback to iso-8859-1 (always succeeds)
+    return Encoding.GetEncoding("iso-8859-1").GetString(bytes);
+}
+```
+
+---
+
+## Code Examples
+
+### Extract Archive with Japanese Filenames
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding(932)  // cp932
+    }
+};
+
+using (var archive = ZipArchive.Open("japanese_files.zip", options))
+{
+    archive.WriteToDirectory(@"C:\output", new ExtractionOptions
+    {
+        ExtractFullPath = true,
+        Overwrite = true
+    });
+}
+// Files extracted with correct Japanese names
+```
+
+### Extract Archive with Western European Filenames
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("iso-8859-1")
+    }
+};
+
+using (var archive = ZipArchive.Open("french_files.zip", options))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+// Accented characters (é, è, ê, etc.) display correctly
+```
+
+### Extract Archive with Chinese Filenames
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("gbk")  // Simplified Chinese
+    }
+};
+
+using (var archive = ZipArchive.Open("chinese_files.zip", options))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+```
+
+### Extract Archive with Russian Filenames
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("cp1251")  // Windows Cyrillic
+    }
+};
+
+using (var archive = ZipArchive.Open("russian_files.zip", options))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+```
+
+### Reader API with Encoding
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding(932)
+    }
+};
+
+using (var stream = File.OpenRead("japanese.zip"))
+using (var reader = ReaderFactory.Open(stream, options))
+{
+    while (reader.MoveToNextEntry())
+    {
+        if (!reader.Entry.IsDirectory)
+        {
+            Console.WriteLine(reader.Entry.Key);  // Correct characters
+            reader.WriteEntryToDirectory(@"C:\output");
+        }
+    }
+}
+```
+
+---
+
+## Creating Archives with Correct Encoding
+
+When creating archives, SharpCompress uses UTF8 by default (recommended):
+
+```csharp
+// Create with UTF8 (default, recommended)
+using (var archive = ZipArchive.Create())
+{
+    archive.AddAllFromDirectory(@"D:\my_files");
+    archive.SaveTo("output.zip", CompressionType.Deflate);
+    // Archives created with UTF8 encoding
+}
+```
+
+If you need to create archives for systems that expect specific encodings:
+
+```csharp
+// Note: SharpCompress Writer API uses UTF8 for encoding
+// To create archives with other encodings, consider:
+// 1. Let users on those systems create archives
+// 2. Use system tools (7-Zip, WinRAR) with desired encoding
+// 3. Post-process archives if absolutely necessary
+
+// For now, recommend modern UTF8-based archives
+```
+
+---
+
+## Troubleshooting Encoding Issues
+
+### Filenames Show Question Marks (?)
+
+```
+✗ Wrong encoding detected
+test文件.txt → test???.txt
+```
+
+**Solution:** Specify correct encoding explicitly
+
+```csharp
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding 
+    { 
+        Default = Encoding.GetEncoding("gbk")  // Try different encodings
+    }
+};
+```
+
+### Filenames Show Replacement Character (￿)
+
+```
+✗ Invalid bytes for selected encoding
+café.txt → caf￿.txt
+```
+
+**Solution:**
+1. Try a different encoding (see Common Encodings table)
+2. Use CustomDecoder with fallback encoding
+3. Archive might be corrupted
+
+### Mixed Encodings in Single Archive
+
+```csharp
+// Use CustomDecoder to handle mixed encodings
+var options = new ReaderOptions
+{
+    ArchiveEncoding = new ArchiveEncoding
+    {
+        CustomDecoder = (data, offset, length) =>
+        {
+            // Try multiple encodings in priority order
+            var bytes = new byte[length];
+            Array.Copy(data, offset, bytes, 0, length);
+            
+            foreach (var encoding in new[] 
+            {
+                Encoding.UTF8,
+                Encoding.GetEncoding(932),
+                Encoding.GetEncoding("iso-8859-1")
+            })
+            {
+                try
+                {
+                    var str = encoding.GetString(bytes);
+                    if (!str.Contains('\uFFFD'))
+                        return str;
+                }
+                catch { }
+            }
+            
+            // Final fallback
+            return Encoding.GetEncoding("iso-8859-1").GetString(bytes);
+        }
+    }
+};
+```
+
+---
+
+## Encoding Reference Table
+
+| Encoding | Code | Use Case |
+|----------|------|----------|
+| UTF-8 | (default) | Modern archives, recommended |
+| cp932 | 932 | Japanese Windows |
+| gb2312 | "gb2312" | Simplified Chinese |
+| gbk | "gbk" | Extended Simplified Chinese |
+| big5 | "big5" | Traditional Chinese |
+| iso-8859-1 | "iso-8859-1" | Western European |
+| cp1252 | "cp1252" | Windows Western European |
+| cp1251 | "cp1251" | Russian/Cyrillic |
+| euc-jp | "euc-jp" | Japanese Unix |
+| euc-kr | "euc-kr" | Korean |
+
+---
+
+## Best Practices
+
+1. **Use UTF-8 for new archives** - Most modern systems support it
+2. **Ask the archive creator** - When receiving archives with corrupted names
+3. **Provide encoding options** - If your app handles user archives
+4. **Document your assumption** - Tell users what encoding you're using
+5. **Test with international files** - Before releasing production code
+
+---
+
+## Related Documentation
+
+- [USAGE.md](USAGE.md#extract-zip-which-has-non-utf8-encoded-filenamycp932) - Usage examples

docs/PERFORMANCE.md

@@ -0,0 +1,474 @@
+# SharpCompress Performance Guide
+
+This guide helps you optimize SharpCompress for performance in various scenarios.
+
+## API Selection Guide
+
+### Archive API vs Reader API
+
+Choose the right API based on your use case:
+
+| Aspect | Archive API | Reader API |
+|--------|------------|-----------|
+| **Stream Type** | Seekable only | Non-seekable OK |
+| **Memory Usage** | All entries in memory | One entry at a time |
+| **Random Access** | ✓ Yes | ✗ No |
+| **Best For** | Small-to-medium archives | Large or streaming data |
+| **Performance** | Fast for random access | Better for large files |
+
+### Archive API (Fast for Random Access)
+
+```csharp
+// Use when:
+// - Archive fits in memory
+// - You need random access to entries
+// - Stream is seekable (file, MemoryStream)
+
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    // Random access - all entries available
+    var specific = archive.Entries.FirstOrDefault(e => e.Key == "file.txt");
+    if (specific != null)
+    {
+        specific.WriteToFile(@"C:\output\file.txt");
+    }
+}
+```
+
+**Performance Characteristics:**
+- ✓ Instant entry lookup
+- ✓ Parallel extraction possible
+- ✗ Entire archive in memory
+- ✗ Can't process while downloading
+
+### Reader API (Best for Large Files)
+
+```csharp
+// Use when:
+// - Processing large archives (>100 MB)
+// - Streaming from network/pipe
+// - Memory is constrained
+// - Forward-only processing is acceptable
+
+using (var stream = File.OpenRead("large.zip"))
+using (var reader = ReaderFactory.Open(stream))
+{
+    while (reader.MoveToNextEntry())
+    {
+        // Process one entry at a time
+        reader.WriteEntryToDirectory(@"C:\output");
+    }
+}
+```
+
+**Performance Characteristics:**
+- ✓ Minimal memory footprint
+- ✓ Works with non-seekable streams
+- ✓ Can process while downloading
+- ✗ Forward-only (no random access)
+- ✗ Entry lookup requires iteration
+
+---
+
+## Buffer Sizing
+
+### Understanding Buffers
+
+SharpCompress uses internal buffers for reading compressed data. Buffer size affects:
+- **Speed:** Larger buffers = fewer I/O operations = faster
+- **Memory:** Larger buffers = higher memory usage
+
+### Recommended Buffer Sizes
+
+| Scenario | Size | Notes |
+|----------|------|-------|
+| Embedded/IoT devices | 4-8 KB | Minimal memory usage |
+| Memory-constrained | 16-32 KB | Conservative default |
+| Standard use (default) | 64 KB | Recommended default |
+| Large file streaming | 256 KB | Better throughput |
+| High-speed SSD | 512 KB - 1 MB | Maximum throughput |
+
+### How Buffer Size Affects Performance
+
+```csharp
+// SharpCompress manages buffers internally
+// You can't directly set buffer size, but you can:
+
+// 1. Use Stream.CopyTo with explicit buffer size
+using (var entryStream = reader.OpenEntryStream())
+using (var fileStream = File.Create(@"C:\output\file.txt"))
+{
+    // 64 KB buffer (default)
+    entryStream.CopyTo(fileStream);
+    
+    // Or specify larger buffer for faster copy
+    entryStream.CopyTo(fileStream, bufferSize: 262144);  // 256 KB
+}
+
+// 2. Use custom buffer for writing
+using (var entryStream = reader.OpenEntryStream())
+using (var fileStream = File.Create(@"C:\output\file.txt"))
+{
+    byte[] buffer = new byte[262144];  // 256 KB
+    int bytesRead;
+    while ((bytesRead = entryStream.Read(buffer, 0, buffer.Length)) > 0)
+    {
+        fileStream.Write(buffer, 0, bytesRead);
+    }
+}
+```
+
+---
+
+## Streaming Large Files
+
+### Non-Seekable Stream Patterns
+
+For processing archives from downloads or pipes:
+
+```csharp
+// Download stream (non-seekable)
+using (var httpStream = await httpClient.GetStreamAsync(url))
+using (var reader = ReaderFactory.Open(httpStream))
+{
+    // Process entries as they arrive
+    while (reader.MoveToNextEntry())
+    {
+        if (!reader.Entry.IsDirectory)
+        {
+            reader.WriteEntryToDirectory(@"C:\output");
+        }
+    }
+}
+```
+
+**Performance Tips:**
+- Don't try to buffer the entire stream
+- Process entries immediately
+- Use async APIs for better responsiveness
+
+### Download-Then-Extract vs Streaming
+
+Choose based on your constraints:
+
+| Approach | When to Use |
+|----------|------------|
+| **Download then extract** | Moderate size, need random access |
+| **Stream during download** | Large files, bandwidth limited, memory constrained |
+
+```csharp
+// Download then extract (requires disk space)
+var archivePath = await DownloadFile(url, @"C:\temp\archive.zip");
+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.Open(httpStream))
+{
+    while (reader.MoveToNextEntry())
+    {
+        reader.WriteEntryToDirectory(@"C:\output");
+    }
+}
+```
+
+---
+
+## Solid Archive Optimization
+
+### Why Solid Archives Are Slow
+
+Solid archives (Rar, 7Zip) group files together in a single compressed stream:
+
+```
+Solid Archive Layout:
+[Header] [Compressed Stream] [Footer]
+         ├─ File1 compressed data
+         ├─ File2 compressed data
+         ├─ File3 compressed data
+         └─ File4 compressed data
+```
+
+Extracting File3 requires decompressing File1 and File2 first.
+
+### Sequential vs Random Extraction
+
+**Random Extraction (Slow):**
+```csharp
+using (var archive = RarArchive.Open("solid.rar"))
+{
+    foreach (var entry in archive.Entries)
+    {
+        entry.WriteToFile(@"C:\output\" + entry.Key);  // ✗ Slow!
+        // Each entry triggers full decompression from start
+    }
+}
+```
+
+**Sequential Extraction (Fast):**
+```csharp
+using (var archive = RarArchive.Open("solid.rar"))
+{
+    // Method 1: Use WriteToDirectory (recommended)
+    archive.WriteToDirectory(@"C:\output", new ExtractionOptions
+    {
+        ExtractFullPath = true,
+        Overwrite = true
+    });
+    
+    // Method 2: Use ExtractAllEntries
+    archive.ExtractAllEntries();
+    
+    // Method 3: Use Reader API (also sequential)
+    using (var reader = RarReader.Open(File.OpenRead("solid.rar")))
+    {
+        while (reader.MoveToNextEntry())
+        {
+            reader.WriteEntryToDirectory(@"C:\output");
+        }
+    }
+}
+```
+
+**Performance Impact:**
+- Random extraction: O(n²) - very slow for many files
+- Sequential extraction: O(n) - 10-100x faster
+
+### Best Practices for Solid Archives
+
+1. **Always extract sequentially** when possible
+2. **Use Reader API** for large solid archives
+3. **Process entries in order** from the archive
+4. **Consider using 7Zip command-line** for scripted extractions
+
+---
+
+## Compression Level Trade-offs
+
+### Deflate/GZip Levels
+
+```csharp
+// Level 1 = Fastest, largest size
+// Level 6 = Default (balanced)
+// Level 9 = Slowest, best compression
+
+// Write with different compression levels
+using (var archive = ZipArchive.Create())
+{
+    archive.AddAllFromDirectory(@"D:\data");
+    
+    // Fast compression (level 1)
+    archive.SaveTo("fast.zip", new WriterOptions(CompressionType.Deflate)
+    {
+        CompressionLevel = 1
+    });
+    
+    // Default compression (level 6)
+    archive.SaveTo("default.zip", CompressionType.Deflate);
+    
+    // Best compression (level 9)
+    archive.SaveTo("best.zip", new WriterOptions(CompressionType.Deflate)
+    {
+        CompressionLevel = 9
+    });
+}
+```
+
+**Speed vs Size:**
+| Level | Speed | Size | Use Case |
+|-------|-------|------|----------|
+| 1 | 10x | 90% | Network, streaming |
+| 6 | 1x | 75% | Default (good balance) |
+| 9 | 0.1x | 65% | Archival, static storage |
+
+### BZip2 Block Size
+
+```csharp
+// BZip2 block size affects memory and compression
+// 100K to 900K (default 900K)
+
+// Smaller block size = lower memory, faster
+// Larger block size = better compression, slower
+
+using (var archive = TarArchive.Create())
+{
+    archive.AddAllFromDirectory(@"D:\data");
+    
+    // These are preset in WriterOptions via CompressionLevel
+    archive.SaveTo("archive.tar.bz2", CompressionType.BZip2);
+}
+```
+
+### LZMA Settings
+
+LZMA compression is very powerful but memory-intensive:
+
+```csharp
+// LZMA (7Zip, .tar.lzma):
+// - Dictionary size: 16 KB to 1 GB (default 32 MB)
+// - Faster preset: smaller dictionary
+// - Better compression: larger dictionary
+
+// Preset via CompressionType
+using (var archive = TarArchive.Create())
+{
+    archive.AddAllFromDirectory(@"D:\data");
+    archive.SaveTo("archive.tar.xz", CompressionType.LZMA);  // Default settings
+}
+```
+
+---
+
+## Async Performance
+
+### When Async Helps
+
+Async is beneficial when:
+- **Long I/O operations** (network, slow disks)
+- **UI responsiveness** needed (Windows Forms, WPF, Blazor)
+- **Server applications** (ASP.NET, multiple concurrent operations)
+
+```csharp
+// Async extraction (non-blocking)
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    await archive.WriteToDirectoryAsync(
+        @"C:\output",
+        new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
+        cancellationToken
+    );
+}
+// Thread can handle other work while I/O happens
+```
+
+### When Async Doesn't Help
+
+Async doesn't improve performance for:
+- **CPU-bound operations** (already fast)
+- **Local SSD I/O** (I/O is fast enough)
+- **Single-threaded scenarios** (no parallelism benefit)
+
+```csharp
+// Sync extraction (simpler, same performance on fast I/O)
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    archive.WriteToDirectory(
+        @"C:\output",
+        new ExtractionOptions { ExtractFullPath = true, Overwrite = true }
+    );
+}
+// Simple and fast - no async needed
+```
+
+### Cancellation Pattern
+
+```csharp
+var cts = new CancellationTokenSource();
+
+// Cancel after 5 minutes
+cts.CancelAfter(TimeSpan.FromMinutes(5));
+
+try
+{
+    using (var archive = ZipArchive.Open("archive.zip"))
+    {
+        await archive.WriteToDirectoryAsync(
+            @"C:\output",
+            new ExtractionOptions { ExtractFullPath = true, Overwrite = true },
+            cts.Token
+        );
+    }
+}
+catch (OperationCanceledException)
+{
+    Console.WriteLine("Extraction cancelled");
+    // Clean up partial extraction if needed
+}
+```
+
+---
+
+## Practical Performance Tips
+
+### 1. Choose the Right API
+
+| Scenario | API | Why |
+|----------|-----|-----|
+| Small archives | Archive | Faster random access |
+| Large archives | Reader | Lower memory |
+| Streaming | Reader | Works on non-seekable streams |
+| Download streams | Reader | Async extraction while downloading |
+
+### 2. Batch Operations
+
+```csharp
+// ✗ Slow - opens each archive separately
+foreach (var file in files)
+{
+    using (var archive = ZipArchive.Open("archive.zip"))
+    {
+        archive.WriteToDirectory(@"C:\output");
+    }
+}
+
+// ✓ Better - process multiple entries at once
+using (var archive = ZipArchive.Open("archive.zip"))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+```
+
+### 3. Profile Your Code
+
+```csharp
+var sw = Stopwatch.StartNew();
+using (var archive = ZipArchive.Open("large.zip"))
+{
+    archive.WriteToDirectory(@"C:\output");
+}
+sw.Stop();
+
+Console.WriteLine($"Extraction took {sw.ElapsedMilliseconds}ms");
+
+// Measure memory before/after
+var beforeMem = GC.GetTotalMemory(true);
+// ... do work ...
+var afterMem = GC.GetTotalMemory(true);
+Console.WriteLine($"Memory used: {(afterMem - beforeMem) / 1024 / 1024}MB");
+```
+
+---
+
+## Troubleshooting Performance
+
+### Extraction is Slow
+
+1. **Check if solid archive** → Use sequential extraction
+2. **Check API** → Reader API might be faster for large files
+3. **Check compression level** → Higher levels are slower to decompress
+4. **Check I/O** → Network drives are much slower than SSD
+5. **Check buffer size** → May need larger buffers for network
+
+### High Memory Usage
+
+1. **Use Reader API** instead of Archive API
+2. **Process entries immediately** rather than buffering
+3. **Reduce compression level** if writing
+4. **Check for memory leaks** in your code
+
+### CPU Usage at 100%
+
+1. **Normal for compression** - especially with high compression levels
+2. **Consider lower level** for faster processing
+3. **Reduce parallelism** if processing multiple archives
+4. **Check if awaiting properly** in async code
+
+---
+
+## Related Documentation
+
+- [PERFORMANCE.md](USAGE.md) - Usage examples with performance considerations
+- [FORMATS.md](FORMATS.md) - Format-specific performance notes

docs/USAGE.md

@@ -1,6 +1,6 @@
 # SharpCompress Usage
 
-## Async/Await Support
+## Async/Await Support (Beta)
 
 SharpCompress now provides full async/await support for all I/O operations. All `Read`, `Write`, and extraction operations have async equivalents ending in `Async` that accept an optional `CancellationToken`. This enables better performance and scalability for I/O-bound operations.
 
@@ -13,7 +13,7 @@ SharpCompress now provides full async/await support for all I/O operations. All
 
 See [Async Examples](#async-examples) section below for usage patterns.
 
-## Stream Rules (changed with 0.21)
+## Stream Rules
 
 When dealing with Streams, the rule should be that you don't close a stream you didn't create. This, in effect, should mean you should always put a Stream in a using block to dispose it. 
 

src/SharpCompress/Archives/AbstractArchive.cs

@@ -1,14 +1,13 @@
-using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.IO;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives;
 
-public abstract class AbstractArchive<TEntry, TVolume> : IArchive
+public abstract class AbstractArchive<TEntry, TVolume> : IArchive, IAsyncArchive
     where TEntry : IArchiveEntry
     where TVolume : IVolume
 {
@@ -26,6 +25,12 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive
         _sourceStream = sourceStream;
         _lazyVolumes = new LazyReadOnlyCollection<TVolume>(LoadVolumes(_sourceStream));
         _lazyEntries = new LazyReadOnlyCollection<TEntry>(LoadEntries(Volumes));
+        _lazyVolumesAsync = new LazyAsyncReadOnlyCollection<TVolume>(
+            LoadVolumesAsync(_sourceStream)
+        );
+        _lazyEntriesAsync = new LazyAsyncReadOnlyCollection<TEntry>(
+            LoadEntriesAsync(_lazyVolumesAsync)
+        );
     }
 
     internal AbstractArchive(ArchiveType type)
@@ -34,19 +39,16 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive
         ReaderOptions = new();
         _lazyVolumes = new LazyReadOnlyCollection<TVolume>(Enumerable.Empty<TVolume>());
         _lazyEntries = new LazyReadOnlyCollection<TEntry>(Enumerable.Empty<TEntry>());
+        _lazyVolumesAsync = new LazyAsyncReadOnlyCollection<TVolume>(
+            AsyncEnumerableEx.Empty<TVolume>()
+        );
+        _lazyEntriesAsync = new LazyAsyncReadOnlyCollection<TEntry>(
+            AsyncEnumerableEx.Empty<TEntry>()
+        );
     }
 
     public ArchiveType Type { get; }
 
-    private static Stream CheckStreams(Stream stream)
-    {
-        if (!stream.CanSeek || !stream.CanRead)
-        {
-            throw new ArchiveException("Archive streams must be Readable and Seekable");
-        }
-        return stream;
-    }
-
     /// <summary>
     /// Returns an ReadOnlyCollection of all the RarArchiveEntries across the one or many parts of the RarArchive.
     /// </summary>
@@ -72,6 +74,19 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive
     protected abstract IEnumerable<TVolume> LoadVolumes(SourceStream sourceStream);
     protected abstract IEnumerable<TEntry> LoadEntries(IEnumerable<TVolume> volumes);
 
+    protected virtual IAsyncEnumerable<TVolume> LoadVolumesAsync(SourceStream sourceStream) =>
+        LoadVolumes(sourceStream).ToAsyncEnumerable();
+
+    protected virtual async IAsyncEnumerable<TEntry> LoadEntriesAsync(
+        IAsyncEnumerable<TVolume> volumes
+    )
+    {
+        foreach (var item in LoadEntries(await volumes.ToListAsync()))
+        {
+            yield return item;
+        }
+    }
+
     IEnumerable<IArchiveEntry> IArchive.Entries => Entries.Cast<IArchiveEntry>();
 
     IEnumerable<IVolume> IArchive.Volumes => _lazyVolumes.Cast<IVolume>();
@@ -118,6 +133,7 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive
     }
 
     protected abstract IReader CreateReaderForSolidExtraction();
+    protected abstract ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync();
 
     /// <summary>
     /// Archive is SOLID (this means the Archive saved bytes by reusing information which helps for archives containing many small files).
@@ -140,4 +156,67 @@ public abstract class AbstractArchive<TEntry, TVolume> : IArchive
             return Entries.All(x => x.IsComplete);
         }
     }
+
+    #region Async Support
+
+    private readonly LazyAsyncReadOnlyCollection<TVolume> _lazyVolumesAsync;
+    private readonly LazyAsyncReadOnlyCollection<TEntry> _lazyEntriesAsync;
+
+    public virtual async ValueTask DisposeAsync()
+    {
+        if (!_disposed)
+        {
+            await foreach (var v in _lazyVolumesAsync)
+            {
+                v.Dispose();
+            }
+            foreach (var v in _lazyEntriesAsync.GetLoaded().Cast<Entry>())
+            {
+                v.Close();
+            }
+            _sourceStream?.Dispose();
+
+            _disposed = true;
+        }
+    }
+
+    private async ValueTask EnsureEntriesLoadedAsync()
+    {
+        await _lazyEntriesAsync.EnsureFullyLoaded();
+        await _lazyVolumesAsync.EnsureFullyLoaded();
+    }
+
+    public virtual IAsyncEnumerable<TEntry> EntriesAsync => _lazyEntriesAsync;
+    IAsyncEnumerable<IArchiveEntry> IAsyncArchive.EntriesAsync =>
+        EntriesAsync.Cast<TEntry, IArchiveEntry>();
+
+    public IAsyncEnumerable<IVolume> VolumesAsync => _lazyVolumesAsync.Cast<TVolume, IVolume>();
+
+    public async ValueTask<IAsyncReader> ExtractAllEntriesAsync()
+    {
+        if (!IsSolid && Type != ArchiveType.SevenZip)
+        {
+            throw new SharpCompressException(
+                "ExtractAllEntries can only be used on solid archives or 7Zip archives (which require random access)."
+            );
+        }
+        await EnsureEntriesLoadedAsync();
+        return await CreateReaderForSolidExtractionAsync();
+    }
+
+    public virtual ValueTask<bool> IsSolidAsync() => new(false);
+
+    public async ValueTask<bool> IsCompleteAsync()
+    {
+        await EnsureEntriesLoadedAsync();
+        return await EntriesAsync.All(x => x.IsComplete);
+    }
+
+    public async ValueTask<long> TotalSizeAsync() =>
+        await EntriesAsync.Aggregate(0L, (total, cf) => total + cf.CompressedSize);
+
+    public async ValueTask<long> TotalUncompressSizeAsync() =>
+        await EntriesAsync.Aggregate(0L, (total, cf) => total + cf.Size);
+
+    #endregion
 }

src/SharpCompress/Archives/AbstractWritableArchive.cs

@@ -162,7 +162,7 @@ public abstract class AbstractWritableArchive<TEntry, TVolume>
         SaveTo(stream, options, OldEntries, newEntries);
     }
 
-    public async Task SaveToAsync(
+    public async ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         CancellationToken cancellationToken = default
@@ -208,7 +208,7 @@ public abstract class AbstractWritableArchive<TEntry, TVolume>
         IEnumerable<TEntry> newEntries
     );
 
-    protected abstract Task SaveToAsync(
+    protected abstract ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         IEnumerable<TEntry> oldEntries,

src/SharpCompress/Archives/ArchiveFactory.cs

@@ -2,6 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Factories;
 using SharpCompress.IO;
@@ -24,6 +26,28 @@ public static class ArchiveFactory
         return FindFactory<IArchiveFactory>(stream).Open(stream, readerOptions);
     }
 
+    /// <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
+    )
+    {
+        readerOptions ??= new ReaderOptions();
+        stream = SharpCompressStream.Create(stream, bufferSize: readerOptions.BufferSize);
+        var factory = await FindFactoryAsync<IArchiveFactory>(stream, cancellationToken)
+            .ConfigureAwait(false);
+        return await factory
+            .OpenAsync(stream, readerOptions, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
     public static IWritableArchive Create(ArchiveType type)
     {
         var factory = Factory
@@ -49,6 +73,22 @@ public static class ArchiveFactory
         return Open(new FileInfo(filePath), options);
     }
 
+    /// <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 OpenAsync(new FileInfo(filePath), options, cancellationToken);
+    }
+
     /// <summary>
     /// Constructor with a FileInfo object to an existing file.
     /// </summary>
@@ -61,6 +101,25 @@ public static class ArchiveFactory
         return FindFactory<IArchiveFactory>(fileInfo).Open(fileInfo, options);
     }
 
+    /// <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
+    )
+    {
+        options ??= new ReaderOptions { LeaveStreamOpen = false };
+
+        var factory = await FindFactoryAsync<IArchiveFactory>(fileInfo, cancellationToken)
+            .ConfigureAwait(false);
+        return await factory.OpenAsync(fileInfo, options, cancellationToken).ConfigureAwait(false);
+    }
+
     /// <summary>
     /// Constructor with IEnumerable FileInfo objects, multi and split support.
     /// </summary>
@@ -87,6 +146,40 @@ public static class ArchiveFactory
         return FindFactory<IMultiArchiveFactory>(fileInfo).Open(filesArray, options);
     }
 
+    /// <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
+    )
+    {
+        fileInfos.NotNull(nameof(fileInfos));
+        var filesArray = fileInfos.ToArray();
+        if (filesArray.Length == 0)
+        {
+            throw new InvalidOperationException("No files to open");
+        }
+
+        var fileInfo = filesArray[0];
+        if (filesArray.Length == 1)
+        {
+            return await OpenAsync(fileInfo, options, cancellationToken).ConfigureAwait(false);
+        }
+
+        fileInfo.NotNull(nameof(fileInfo));
+        options ??= new ReaderOptions { LeaveStreamOpen = false };
+
+        var factory = FindFactory<IMultiArchiveFactory>(fileInfo);
+        return await factory
+            .OpenAsync(filesArray, options, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
     /// <summary>
     /// Constructor with IEnumerable FileInfo objects, multi and split support.
     /// </summary>
@@ -113,6 +206,41 @@ public static class ArchiveFactory
         return FindFactory<IMultiArchiveFactory>(firstStream).Open(streamsArray, options);
     }
 
+    /// <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
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        streams.NotNull(nameof(streams));
+        var streamsArray = streams.ToArray();
+        if (streamsArray.Length == 0)
+        {
+            throw new InvalidOperationException("No streams");
+        }
+
+        var firstStream = streamsArray[0];
+        if (streamsArray.Length == 1)
+        {
+            return await OpenAsync(firstStream, options, cancellationToken).ConfigureAwait(false);
+        }
+
+        firstStream.NotNull(nameof(firstStream));
+        options ??= new ReaderOptions();
+
+        var factory = FindFactory<IMultiArchiveFactory>(firstStream);
+        return await factory
+            .OpenAsync(streamsArray, options, cancellationToken)
+            .ConfigureAwait(false);
+    }
+
     /// <summary>
     /// Extract to specific directory, retaining filename
     /// </summary>
@@ -166,6 +294,52 @@ public static class ArchiveFactory
         );
     }
 
+    private static async ValueTask<T> FindFactoryAsync<T>(
+        FileInfo finfo,
+        CancellationToken cancellationToken
+    )
+        where T : IFactory
+    {
+        finfo.NotNull(nameof(finfo));
+        using Stream stream = finfo.OpenRead();
+        return await FindFactoryAsync<T>(stream, cancellationToken);
+    }
+
+    private static async ValueTask<T> FindFactoryAsync<T>(
+        Stream stream,
+        CancellationToken cancellationToken
+    )
+        where T : IFactory
+    {
+        stream.NotNull(nameof(stream));
+        if (!stream.CanRead || !stream.CanSeek)
+        {
+            throw new ArgumentException("Stream should be readable and seekable");
+        }
+
+        var factories = Factory.Factories.OfType<T>();
+
+        var startPosition = stream.Position;
+
+        foreach (var factory in factories)
+        {
+            stream.Seek(startPosition, SeekOrigin.Begin);
+
+            if (await factory.IsArchiveAsync(stream, cancellationToken: cancellationToken))
+            {
+                stream.Seek(startPosition, SeekOrigin.Begin);
+
+                return factory;
+            }
+        }
+
+        var extensions = string.Join(", ", factories.Select(item => item.Name));
+
+        throw new InvalidOperationException(
+            $"Cannot determine compressed stream type. Supported Archive Formats: {extensions}"
+        );
+    }
+
     public static bool IsArchive(
         string filePath,
         out ArchiveType? type,

src/SharpCompress/Archives/AutoArchiveFactory.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Archives;
 
-class AutoArchiveFactory : IArchiveFactory
+internal class AutoArchiveFactory : IArchiveFactory
 {
     public string Name => nameof(AutoArchiveFactory);
 
@@ -20,11 +22,30 @@ class AutoArchiveFactory : IArchiveFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => throw new NotSupportedException();
 
+    public ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    ) => throw new NotSupportedException();
+
     public FileInfo? GetFilePart(int index, FileInfo part1) => throw new NotSupportedException();
 
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         ArchiveFactory.Open(stream, readerOptions);
 
+    public async ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await ArchiveFactory.OpenAsync(stream, readerOptions, cancellationToken);
+
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         ArchiveFactory.Open(fileInfo, readerOptions);
+
+    public async ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => await ArchiveFactory.OpenAsync(fileInfo, readerOptions, cancellationToken);
 }

src/SharpCompress/Archives/GZip/GZipArchive.cs

@@ -102,6 +102,70 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         );
     }
 
+    /// <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>
@@ -138,10 +202,13 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         SaveTo(stream, new WriterOptions(CompressionType.GZip));
     }
 
-    public Task SaveToAsync(string filePath, CancellationToken cancellationToken = default) =>
+    public ValueTask SaveToAsync(string filePath, CancellationToken cancellationToken = default) =>
         SaveToAsync(new FileInfo(filePath), cancellationToken);
 
-    public async Task SaveToAsync(FileInfo fileInfo, CancellationToken cancellationToken = default)
+    public async ValueTask SaveToAsync(
+        FileInfo fileInfo,
+        CancellationToken cancellationToken = default
+    )
     {
         using var stream = fileInfo.Open(FileMode.Create, FileAccess.Write);
         await SaveToAsync(stream, new WriterOptions(CompressionType.GZip), cancellationToken)
@@ -167,6 +234,28 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         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) { }
 
@@ -213,7 +302,7 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         }
     }
 
-    protected override async Task SaveToAsync(
+    protected override async ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         IEnumerable<GZipArchiveEntry> oldEntries,
@@ -250,4 +339,11 @@ public class GZipArchive : AbstractWritableArchive<GZipArchiveEntry, GZipVolume>
         stream.Position = 0;
         return GZipReader.Open(stream);
     }
+
+    protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
+    {
+        var stream = Volumes.Single().Stream;
+        stream.Position = 0;
+        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 virtual Task<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default)
+    public async ValueTask<Stream> OpenEntryStreamAsync(
+        CancellationToken cancellationToken = default
+    )
     {
         // GZip synchronous implementation is fast enough, just wrap it
-        return Task.FromResult(OpenEntryStream());
+        return OpenEntryStream();
     }
 
     #region IArchiveEntry Members

src/SharpCompress/Archives/IArchiveEntry.cs

@@ -17,7 +17,7 @@ public interface IArchiveEntry : IEntry
     /// Opens the current entry as a stream that will decompress as it is read asynchronously.
     /// Read the entire stream or use SkipEntry on EntryStream.
     /// </summary>
-    Task<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default);
+    ValueTask<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default);
 
     /// <summary>
     /// The archive can find all the parts of the archive needed to extract this entry.

src/SharpCompress/Archives/IArchiveEntryExtensions.cs

@@ -37,7 +37,7 @@ public static class IArchiveEntryExtensions
         /// <param name="streamToWriteTo">The stream to write the entry content to.</param>
         /// <param name="cancellationToken">Cancellation token.</param>
         /// <param name="progress">Optional progress reporter for tracking extraction progress.</param>
-        public async Task WriteToAsync(
+        public async ValueTask WriteToAsync(
             Stream streamToWriteTo,
             IProgress<ProgressReport>? progress = null,
             CancellationToken cancellationToken = default
@@ -110,18 +110,20 @@ public static class IArchiveEntryExtensions
         /// <summary>
         /// Extract to specific directory asynchronously, retaining filename
         /// </summary>
-        public Task WriteToDirectoryAsync(
+        public async ValueTask WriteToDirectoryAsync(
             string destinationDirectory,
             ExtractionOptions? options = null,
             CancellationToken cancellationToken = default
         ) =>
-            ExtractionMethods.WriteEntryToDirectoryAsync(
-                entry,
-                destinationDirectory,
-                options,
-                entry.WriteToFileAsync,
-                cancellationToken
-            );
+            await ExtractionMethods
+                .WriteEntryToDirectoryAsync(
+                    entry,
+                    destinationDirectory,
+                    options,
+                    entry.WriteToFileAsync,
+                    cancellationToken
+                )
+                .ConfigureAwait(false);
 
         /// <summary>
         /// Extract to specific file
@@ -141,21 +143,23 @@ public static class IArchiveEntryExtensions
         /// <summary>
         /// Extract to specific file asynchronously
         /// </summary>
-        public Task WriteToFileAsync(
+        public async ValueTask WriteToFileAsync(
             string destinationFileName,
             ExtractionOptions? options = null,
             CancellationToken cancellationToken = default
         ) =>
-            ExtractionMethods.WriteEntryToFileAsync(
-                entry,
-                destinationFileName,
-                options,
-                async (x, fm, ct) =>
-                {
-                    using var fs = File.Open(destinationFileName, fm);
-                    await entry.WriteToAsync(fs, null, ct).ConfigureAwait(false);
-                },
-                cancellationToken
-            );
+            await ExtractionMethods
+                .WriteEntryToFileAsync(
+                    entry,
+                    destinationFileName,
+                    options,
+                    async (x, fm, ct) =>
+                    {
+                        using var fs = File.Open(destinationFileName, fm);
+                        await entry.WriteToAsync(fs, null, ct).ConfigureAwait(false);
+                    },
+                    cancellationToken
+                )
+                .ConfigureAwait(false);
     }
 }

src/SharpCompress/Archives/IArchiveExtensions.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Threading;
-using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Readers;
 
@@ -80,89 +78,5 @@ public static class IArchiveExtensions
                 );
             }
         }
-
-        /// <summary>
-        /// Extract to specific directory asynchronously with progress reporting and cancellation support
-        /// </summary>
-        /// <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 (archive.IsSolid || archive.Type == ArchiveType.SevenZip)
-            {
-                using var reader = archive.ExtractAllEntries();
-                await reader.WriteAllToDirectoryAsync(
-                    destinationDirectory,
-                    options,
-                    cancellationToken
-                );
-            }
-            else
-            {
-                // For non-solid archives, extract entries directly
-                await archive.WriteToDirectoryAsyncInternal(
-                    destinationDirectory,
-                    options,
-                    progress,
-                    cancellationToken
-                );
-            }
-        }
-
-        private async Task WriteToDirectoryAsyncInternal(
-            string destinationDirectory,
-            ExtractionOptions? options,
-            IProgress<ProgressReport>? progress,
-            CancellationToken cancellationToken
-        )
-        {
-            // 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)
-            {
-                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;
-                }
-
-                // 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/IArchiveFactory.cs

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

src/SharpCompress/Archives/IAsyncArchive.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using SharpCompress.Common;
+using SharpCompress.Readers;
+
+namespace SharpCompress.Archives;
+
+public interface IAsyncArchive : IAsyncDisposable
+{
+    IAsyncEnumerable<IArchiveEntry> EntriesAsync { get; }
+    IAsyncEnumerable<IVolume> VolumesAsync { get; }
+
+    ArchiveType Type { get; }
+
+    /// <summary>
+    /// Use this method to extract all entries in an archive in order.
+    /// This is primarily for SOLID Rar Archives or 7Zip Archives as they need to be
+    /// extracted sequentially for the best performance.
+    /// </summary>
+    ValueTask<IAsyncReader> ExtractAllEntriesAsync();
+
+    /// <summary>
+    /// Archive is SOLID (this means the Archive saved bytes by reusing information which helps for archives containing many small files).
+    /// Rar Archives can be SOLID while all 7Zip archives are considered SOLID.
+    /// </summary>
+    ValueTask<bool> IsSolidAsync();
+
+    /// <summary>
+    /// This checks to see if all the known entries have IsComplete = true
+    /// </summary>
+    ValueTask<bool> IsCompleteAsync();
+
+    /// <summary>
+    /// The total size of the files compressed in the archive.
+    /// </summary>
+    ValueTask<long> TotalSizeAsync();
+
+    /// <summary>
+    /// The total size of the files as uncompressed in the archive.
+    /// </summary>
+    ValueTask<long> TotalUncompressSizeAsync();
+}

src/SharpCompress/Archives/IAsyncArchiveExtensions.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Common;
+using SharpCompress.Readers;
+
+namespace SharpCompress.Archives;
+
+public static class IAsyncArchiveExtensions
+{
+    /// <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
+    )
+    {
+        // For solid archives (Rar, 7Zip), use the optimized reader-based approach
+        if (await archive.IsSolidAsync() || archive.Type == ArchiveType.SevenZip)
+        {
+            await using var reader = await archive.ExtractAllEntriesAsync();
+            await reader.WriteAllToDirectoryAsync(destinationDirectory, options, cancellationToken);
+        }
+        else
+        {
+            // For non-solid archives, extract entries directly
+            await archive.WriteToDirectoryAsyncInternal(
+                destinationDirectory,
+                options,
+                progress,
+                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)
+            {
+                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

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

src/SharpCompress/Archives/IWritableArchive.cs

@@ -22,7 +22,7 @@ public interface IWritableArchive : IArchive
 
     void SaveTo(Stream stream, WriterOptions options);
 
-    Task SaveToAsync(
+    ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         CancellationToken cancellationToken = default

src/SharpCompress/Archives/IWritableArchiveExtensions.cs

@@ -44,14 +44,14 @@ public static class IWritableArchiveExtensions
         writableArchive.SaveTo(stream, options);
     }
 
-    public static Task SaveToAsync(
+    public static ValueTask SaveToAsync(
         this IWritableArchive writableArchive,
         string filePath,
         WriterOptions options,
         CancellationToken cancellationToken = default
     ) => writableArchive.SaveToAsync(new FileInfo(filePath), options, cancellationToken);
 
-    public static async Task SaveToAsync(
+    public static async ValueTask SaveToAsync(
         this IWritableArchive writableArchive,
         FileInfo fileInfo,
         WriterOptions options,

src/SharpCompress/Archives/Rar/RarArchive.cs

@@ -2,6 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Rar;
 using SharpCompress.Common.Rar.Headers;
@@ -65,7 +67,13 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
         return new StreamRarArchiveVolume(sourceStream, ReaderOptions, i++).AsEnumerable();
     }
 
-    protected override IReader CreateReaderForSolidExtraction()
+    protected override IReader CreateReaderForSolidExtraction() =>
+        CreateReaderForSolidExtractionInternal();
+
+    protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync() =>
+        new(CreateReaderForSolidExtractionInternal());
+
+    private RarReader CreateReaderForSolidExtractionInternal()
     {
         if (this.IsMultipartVolume())
         {
@@ -181,6 +189,70 @@ public class RarArchive : AbstractArchive<RarArchiveEntry, RarVolume>
         );
     }
 
+    /// <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)

src/SharpCompress/Archives/Rar/RarArchiveEntry.cs

@@ -92,7 +92,9 @@ public class RarArchiveEntry : RarEntry, IArchiveEntry
         return stream;
     }
 
-    public async Task<Stream> OpenEntryStreamAsync(CancellationToken cancellationToken = default)
+    public async ValueTask<Stream> OpenEntryStreamAsync(
+        CancellationToken cancellationToken = default
+    )
     {
         RarStream stream;
         if (IsRarV3)

src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs

@@ -105,6 +105,70 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
         );
     }
 
+    /// <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>
@@ -201,6 +265,9 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
     protected override IReader CreateReaderForSolidExtraction() =>
         new SevenZipReader(ReaderOptions, this);
 
+    protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync() =>
+        new(new SevenZipReader(ReaderOptions, this));
+
     public override bool IsSolid =>
         Entries
             .Where(x => !x.IsDirectory)

src/SharpCompress/Archives/SevenZip/SevenZipArchiveEntry.cs

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

src/SharpCompress/Archives/Tar/TarArchive.cs

@@ -103,6 +103,70 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         );
     }
 
+    /// <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)
@@ -259,7 +323,7 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         }
     }
 
-    protected override async Task SaveToAsync(
+    protected override async ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         IEnumerable<TarArchiveEntry> oldEntries,
@@ -302,4 +366,11 @@ public class TarArchive : AbstractWritableArchive<TarArchiveEntry, TarVolume>
         stream.Position = 0;
         return TarReader.Open(stream);
     }
+
+    protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
+    {
+        var stream = Volumes.Single().Stream;
+        stream.Position = 0;
+        return new(TarReader.Open(stream));
+    }
 }

src/SharpCompress/Archives/Tar/TarArchiveEntry.cs

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

src/SharpCompress/Archives/Zip/ZipArchive.cs

@@ -124,6 +124,70 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         );
     }
 
+    /// <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,
@@ -199,7 +263,95 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
                 if (stream.CanSeek) //could be multipart. Test for central directory - might not be z64 safe
                 {
                     var z = new SeekableZipHeaderFactory(password, new ArchiveEncoding());
-                    var x = z.ReadSeekableHeader(stream).FirstOrDefault();
+                    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
@@ -254,7 +406,9 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
     protected override IEnumerable<ZipArchiveEntry> LoadEntries(IEnumerable<ZipVolume> volumes)
     {
         var vols = volumes.ToArray();
-        foreach (var h in headerFactory.NotNull().ReadSeekableHeader(vols.Last().Stream))
+        foreach (
+            var h in headerFactory.NotNull().ReadSeekableHeader(vols.Last().Stream, useSync: true)
+        )
         {
             if (h != null)
             {
@@ -298,6 +452,59 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         }
     }
 
+    protected override async IAsyncEnumerable<ZipArchiveEntry> LoadEntriesAsync(
+        IAsyncEnumerable<ZipVolume> volumes
+    )
+    {
+        var vols = await volumes.ToListAsync();
+        var volsArray = vols.ToArray();
+
+        await foreach (
+            var h in headerFactory.NotNull().ReadSeekableHeaderAsync(volsArray.Last().Stream)
+        )
+        {
+            if (h != null)
+            {
+                switch (h.ZipHeaderType)
+                {
+                    case ZipHeaderType.DirectoryEntry:
+                        {
+                            var deh = (DirectoryEntryHeader)h;
+                            Stream s;
+                            if (
+                                deh.RelativeOffsetOfEntryHeader + deh.CompressedSize
+                                > volsArray[deh.DiskNumberStart].Stream.Length
+                            )
+                            {
+                                var v = volsArray.Skip(deh.DiskNumberStart).ToArray();
+                                s = new SourceStream(
+                                    v[0].Stream,
+                                    i => i < v.Length ? v[i].Stream : null,
+                                    new ReaderOptions() { LeaveStreamOpen = true }
+                                );
+                            }
+                            else
+                            {
+                                s = volsArray[deh.DiskNumberStart].Stream;
+                            }
+
+                            yield return new ZipArchiveEntry(
+                                this,
+                                new SeekableZipFilePart(headerFactory.NotNull(), deh, s)
+                            );
+                        }
+                        break;
+                    case ZipHeaderType.DirectoryEnd:
+                    {
+                        var bytes = ((DirectoryEndHeader)h).Comment ?? Array.Empty<byte>();
+                        volsArray.Last().Comment = ReaderOptions.ArchiveEncoding.Decode(bytes);
+                        yield break;
+                    }
+                }
+            }
+        }
+    }
+
     public void SaveTo(Stream stream) => SaveTo(stream, new WriterOptions(CompressionType.Deflate));
 
     protected override void SaveTo(
@@ -329,7 +536,7 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         }
     }
 
-    protected override async Task SaveToAsync(
+    protected override async ValueTask SaveToAsync(
         Stream stream,
         WriterOptions options,
         IEnumerable<ZipArchiveEntry> oldEntries,
@@ -385,4 +592,11 @@ public class ZipArchive : AbstractWritableArchive<ZipArchiveEntry, ZipVolume>
         ((IStreamStack)stream).StackSeek(0);
         return ZipReader.Open(stream, ReaderOptions, Entries);
     }
+
+    protected override ValueTask<IAsyncReader> CreateReaderForSolidExtractionAsync()
+    {
+        var stream = Volumes.Single().Stream;
+        stream.Position = 0;
+        return new(ZipReader.Open(stream));
+    }
 }

src/SharpCompress/Archives/Zip/ZipArchiveEntry.cs

@@ -13,9 +13,17 @@ public class ZipArchiveEntry : ZipEntry, IArchiveEntry
 
     public virtual Stream OpenEntryStream() => Parts.Single().GetCompressedStream().NotNull();
 
-    public virtual Task<Stream> OpenEntryStreamAsync(
+    public async ValueTask<Stream> OpenEntryStreamAsync(
         CancellationToken cancellationToken = default
-    ) => Task.FromResult(OpenEntryStream());
+    )
+    {
+        var part = Parts.Single();
+        if (part is SeekableZipFilePart seekablePart)
+        {
+            return (await seekablePart.GetCompressedStreamAsync(cancellationToken)).NotNull();
+        }
+        return OpenEntryStream();
+    }
 
     #region IArchiveEntry Members
 

src/SharpCompress/Common/Ace/Headers/AceFileHeader.cs

@@ -46,7 +46,7 @@ namespace SharpCompress.Common.Ace.Headers
             }
         }
 
-        public AceFileHeader(ArchiveEncoding archiveEncoding)
+        public AceFileHeader(IArchiveEncoding archiveEncoding)
             : base(archiveEncoding, AceHeaderType.FILE) { }
 
         /// <summary>

src/SharpCompress/Common/Ace/Headers/AceHeader.cs

@@ -31,13 +31,13 @@ namespace SharpCompress.Common.Ace.Headers
             (byte)'*',
         ];
 
-        public AceHeader(ArchiveEncoding archiveEncoding, AceHeaderType type)
+        public AceHeader(IArchiveEncoding archiveEncoding, AceHeaderType type)
         {
             AceHeaderType = type;
             ArchiveEncoding = archiveEncoding;
         }
 
-        public ArchiveEncoding ArchiveEncoding { get; }
+        public IArchiveEncoding ArchiveEncoding { get; }
         public AceHeaderType AceHeaderType { get; }
 
         public ushort HeaderFlags { get; set; }

src/SharpCompress/Common/Ace/Headers/AceMainHeader.cs

@@ -22,7 +22,7 @@ namespace SharpCompress.Common.Ace.Headers
         public List<byte> Comment { get; set; } = new();
         public byte AceVersion { get; private set; }
 
-        public AceMainHeader(ArchiveEncoding archiveEncoding)
+        public AceMainHeader(IArchiveEncoding archiveEncoding)
             : base(archiveEncoding, AceHeaderType.MAIN) { }
 
         /// <summary>

src/SharpCompress/Common/Arc/ArcEntryHeader.cs

@@ -7,7 +7,7 @@ namespace SharpCompress.Common.Arc
 {
     public class ArcEntryHeader
     {
-        public ArchiveEncoding ArchiveEncoding { get; }
+        public IArchiveEncoding ArchiveEncoding { get; }
         public CompressionType CompressionMethod { get; private set; }
         public string? Name { get; private set; }
         public long CompressedSize { get; private set; }
@@ -16,7 +16,7 @@ namespace SharpCompress.Common.Arc
         public long OriginalSize { get; private set; }
         public long DataStartPosition { get; private set; }
 
-        public ArcEntryHeader(ArchiveEncoding archiveEncoding)
+        public ArcEntryHeader(IArchiveEncoding archiveEncoding)
         {
             this.ArchiveEncoding = archiveEncoding;
         }

src/SharpCompress/Common/ArchiveEncoding.cs

@@ -3,55 +3,11 @@ using System.Text;
 
 namespace SharpCompress.Common;
 
-public class ArchiveEncoding
+public class ArchiveEncoding : IArchiveEncoding
 {
-    /// <summary>
-    /// Default encoding to use when archive format doesn't specify one.
-    /// </summary>
-    public Encoding? Default { get; set; }
-
-    /// <summary>
-    /// ArchiveEncoding used by encryption schemes which don't comply with RFC 2898.
-    /// </summary>
-    public Encoding? Password { get; set; }
-
-    /// <summary>
-    /// Set this encoding when you want to force it for all encoding operations.
-    /// </summary>
+    public Encoding Default { get; set; } = Encoding.Default;
+    public Encoding Password { get; set; } = Encoding.Default;
+    public Encoding UTF8 { get; set; } = Encoding.UTF8;
     public Encoding? Forced { get; set; }
-
-    /// <summary>
-    /// Set this when you want to use a custom method for all decoding operations.
-    /// </summary>
-    /// <returns>string Func(bytes, index, length)</returns>
-    public Func<byte[], int, int, string>? CustomDecoder { get; set; }
-
-    public ArchiveEncoding()
-        : this(Encoding.Default, Encoding.Default) { }
-
-    public ArchiveEncoding(Encoding def, Encoding password)
-    {
-        Default = def;
-        Password = password;
-    }
-
-#if !NETFRAMEWORK
-    static ArchiveEncoding() => Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
-#endif
-
-    public string Decode(byte[] bytes) => Decode(bytes, 0, bytes.Length);
-
-    public string Decode(byte[] bytes, int start, int length) =>
-        GetDecoder().Invoke(bytes, start, length);
-
-    public string DecodeUTF8(byte[] bytes) => Encoding.UTF8.GetString(bytes, 0, bytes.Length);
-
-    public byte[] Encode(string str) => GetEncoding().GetBytes(str);
-
-    public Encoding GetEncoding() => Forced ?? Default ?? Encoding.UTF8;
-
-    public Encoding GetPasswordEncoding() => Password ?? Encoding.UTF8;
-
-    public Func<byte[], int, int, string> GetDecoder() =>
-        CustomDecoder ?? ((bytes, index, count) => GetEncoding().GetString(bytes, index, count));
+    public Func<byte[], int, int, EncodingType, string>? CustomDecoder { get; set; }
 }

src/SharpCompress/Common/ArchiveEncodingExtensions.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Text;
+
+namespace SharpCompress.Common;
+
+/// <summary>
+/// Specifies the type of encoding to use.
+/// </summary>
+public enum EncodingType
+{
+    /// <summary>
+    /// Uses the default encoding.
+    /// </summary>
+    Default,
+
+    /// <summary>
+    /// Uses UTF-8 encoding.
+    /// </summary>
+    UTF8,
+}
+
+/// <summary>
+/// Provides extension methods for archive encoding.
+/// </summary>
+public static class ArchiveEncodingExtensions
+{
+#if !NETFRAMEWORK
+    /// <summary>
+    /// Registers the code pages encoding provider.
+    /// </summary>
+    static ArchiveEncodingExtensions() =>
+        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+#endif
+
+    extension(IArchiveEncoding encoding)
+    {
+        /// <summary>
+        /// Gets the encoding based on the archive encoding settings.
+        /// </summary>
+        /// <param name="useUtf8">Whether to use UTF-8.</param>
+        /// <returns>The encoding.</returns>
+        public Encoding GetEncoding(bool useUtf8 = false) =>
+            encoding.Forced ?? (useUtf8 ? encoding.UTF8 : encoding.Default);
+
+        /// <summary>
+        /// Gets the decoder function for the archive encoding.
+        /// </summary>
+        /// <returns>The decoder function.</returns>
+        public Func<byte[], int, int, EncodingType, string> GetDecoder() =>
+            encoding.CustomDecoder
+            ?? (
+                (bytes, index, count, type) =>
+                    encoding.GetEncoding(type == EncodingType.UTF8).GetString(bytes, index, count)
+            );
+
+        /// <summary>
+        /// Encodes a string using the default encoding.
+        /// </summary>
+        /// <param name="str">The string to encode.</param>
+        /// <returns>The encoded bytes.</returns>
+        public byte[] Encode(string str) => encoding.Default.GetBytes(str);
+
+        /// <summary>
+        /// Decodes bytes using the specified encoding type.
+        /// </summary>
+        /// <param name="bytes">The bytes to decode.</param>
+        /// <param name="type">The encoding type.</param>
+        /// <returns>The decoded string.</returns>
+        public string Decode(byte[] bytes, EncodingType type = EncodingType.Default) =>
+            encoding.Decode(bytes, 0, bytes.Length, type);
+
+        /// <summary>
+        /// Decodes a portion of bytes using the specified encoding type.
+        /// </summary>
+        /// <param name="bytes">The bytes to decode.</param>
+        /// <param name="start">The start index.</param>
+        /// <param name="length">The length.</param>
+        /// <param name="type">The encoding type.</param>
+        /// <returns>The decoded string.</returns>
+        public string Decode(
+            byte[] bytes,
+            int start,
+            int length,
+            EncodingType type = EncodingType.Default
+        ) => encoding.GetDecoder()(bytes, start, length, type);
+    }
+}

src/SharpCompress/Common/AsyncBinaryReader.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Buffers.Binary;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SharpCompress.Common
+{
+    public sealed class AsyncBinaryReader : IDisposable
+    {
+        private readonly Stream _stream;
+        private readonly Stream _originalStream;
+        private readonly bool _leaveOpen;
+        private readonly byte[] _buffer = new byte[8];
+        private bool _disposed;
+
+        public AsyncBinaryReader(Stream stream, bool leaveOpen = false, int bufferSize = 4096)
+        {
+            _originalStream = stream ?? throw new ArgumentNullException(nameof(stream));
+            _leaveOpen = leaveOpen;
+
+            // Use the stream directly without wrapping in BufferedStream
+            // BufferedStream uses synchronous Read internally which doesn't work with async-only streams
+            // SharpCompress uses SharpCompressStream for buffering which supports true async reads
+            _stream = stream;
+        }
+
+        public Stream BaseStream => _stream;
+
+        public async ValueTask<byte> ReadByteAsync(CancellationToken ct = default)
+        {
+            await _stream.ReadExactAsync(_buffer, 0, 1, ct).ConfigureAwait(false);
+            return _buffer[0];
+        }
+
+        public async ValueTask<ushort> ReadUInt16Async(CancellationToken ct = default)
+        {
+            await _stream.ReadExactAsync(_buffer, 0, 2, ct).ConfigureAwait(false);
+            return BinaryPrimitives.ReadUInt16LittleEndian(_buffer);
+        }
+
+        public async ValueTask<uint> ReadUInt32Async(CancellationToken ct = default)
+        {
+            await _stream.ReadExactAsync(_buffer, 0, 4, ct).ConfigureAwait(false);
+            return BinaryPrimitives.ReadUInt32LittleEndian(_buffer);
+        }
+
+        public async ValueTask<ulong> ReadUInt64Async(CancellationToken ct = default)
+        {
+            await _stream.ReadExactAsync(_buffer, 0, 8, ct).ConfigureAwait(false);
+            return BinaryPrimitives.ReadUInt64LittleEndian(_buffer);
+        }
+
+        public async ValueTask<byte[]> ReadBytesAsync(int count, CancellationToken ct = default)
+        {
+            var result = new byte[count];
+            await _stream.ReadExactAsync(result, 0, count, ct).ConfigureAwait(false);
+            return result;
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            _disposed = true;
+
+            // Dispose the original stream if we own it
+            if (!_leaveOpen)
+            {
+                _originalStream.Dispose();
+            }
+        }
+
+#if NET6_0_OR_GREATER
+        public async ValueTask DisposeAsync()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            _disposed = true;
+
+            // Dispose the original stream if we own it
+            if (!_leaveOpen)
+            {
+                await _originalStream.DisposeAsync().ConfigureAwait(false);
+            }
+        }
+#endif
+    }
+}

src/SharpCompress/Common/EntryStream.cs

@@ -56,7 +56,7 @@ public class EntryStream : Stream, IStreamStack
     /// <summary>
     /// Asynchronously skip the rest of the entry stream.
     /// </summary>
-    public async Task SkipEntryAsync(CancellationToken cancellationToken = default)
+    public async ValueTask SkipEntryAsync(CancellationToken cancellationToken = default)
     {
         await this.SkipAsync(cancellationToken).ConfigureAwait(false);
         _completed = true;

src/SharpCompress/Common/ExtractionMethods.cs

@@ -124,11 +124,11 @@ internal static class ExtractionMethods
         }
     }
 
-    public static async Task WriteEntryToDirectoryAsync(
+    public static async ValueTask WriteEntryToDirectoryAsync(
         IEntry entry,
         string destinationDirectory,
         ExtractionOptions? options,
-        Func<string, ExtractionOptions?, CancellationToken, Task> writeAsync,
+        Func<string, ExtractionOptions?, CancellationToken, ValueTask> writeAsync,
         CancellationToken cancellationToken = default
     )
     {
@@ -197,11 +197,11 @@ internal static class ExtractionMethods
         }
     }
 
-    public static async Task WriteEntryToFileAsync(
+    public static async ValueTask WriteEntryToFileAsync(
         IEntry entry,
         string destinationFileName,
         ExtractionOptions? options,
-        Func<string, FileMode, CancellationToken, Task> openAndWriteAsync,
+        Func<string, FileMode, CancellationToken, ValueTask> openAndWriteAsync,
         CancellationToken cancellationToken = default
     )
     {

src/SharpCompress/Common/FilePart.cs

@@ -1,12 +1,14 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common;
 
 public abstract class FilePart
 {
-    protected FilePart(ArchiveEncoding archiveEncoding) => ArchiveEncoding = archiveEncoding;
+    protected FilePart(IArchiveEncoding archiveEncoding) => ArchiveEncoding = archiveEncoding;
 
-    internal ArchiveEncoding ArchiveEncoding { get; }
+    internal IArchiveEncoding ArchiveEncoding { get; }
 
     internal abstract string? FilePartName { get; }
     public int Index { get; set; }
@@ -14,4 +16,8 @@ public abstract class FilePart
     internal abstract Stream? GetCompressedStream();
     internal abstract Stream? GetRawStream();
     internal bool Skipped { get; set; }
+
+    internal virtual ValueTask<Stream?> GetCompressedStreamAsync(
+        CancellationToken cancellationToken = default
+    ) => new(GetCompressedStream());
 }

src/SharpCompress/Common/GZip/GZipFilePart.cs

@@ -13,7 +13,7 @@ internal sealed class GZipFilePart : FilePart
     private string? _name;
     private readonly Stream _stream;
 
-    internal GZipFilePart(Stream stream, ArchiveEncoding archiveEncoding)
+    internal GZipFilePart(Stream stream, IArchiveEncoding archiveEncoding)
         : base(archiveEncoding)
     {
         _stream = stream;

src/SharpCompress/Common/IArchiveEncoding.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text;
+
+namespace SharpCompress.Common;
+
+/// <summary>
+/// Defines the encoding settings for archives.
+/// </summary>
+public interface IArchiveEncoding
+{
+    /// <summary>
+    /// Default encoding to use when archive format doesn't specify one.  Required and defaults to Encoding.Default.
+    /// </summary>
+    public Encoding Default { get; set; }
+
+    /// <summary>
+    /// ArchiveEncoding used by encryption schemes which don't comply with RFC 2898. Required and defaults to Encoding.Default.
+    /// </summary>
+    public Encoding Password { get; set; }
+
+    /// <summary>
+    /// Default encoding to use when archive format specifies UTF-8 encoding. Required and defaults to Encoding.UTF8.
+    /// </summary>
+    public Encoding UTF8 { get; set; }
+
+    /// <summary>
+    /// Set this encoding when you want to force it for all encoding operations.
+    /// </summary>
+    public Encoding? Forced { get; set; }
+
+    /// <summary>
+    /// Set this when you want to use a custom method for all decoding operations.
+    /// </summary>
+    /// <returns>string Func(bytes, index, length, EncodingType)</returns>
+    public Func<byte[], int, int, EncodingType, string>? CustomDecoder { get; set; }
+}

src/SharpCompress/Common/OptionsBase.cs

@@ -7,5 +7,5 @@ public class OptionsBase
     /// </summary>
     public bool LeaveStreamOpen { get; set; } = true;
 
-    public ArchiveEncoding ArchiveEncoding { get; set; } = new();
+    public IArchiveEncoding ArchiveEncoding { get; set; } = new ArchiveEncoding();
 }

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

@@ -13,7 +13,7 @@ internal class RarHeader : IRarHeader
     internal static RarHeader? TryReadBase(
         RarCrcBinaryReader reader,
         bool isRar5,
-        ArchiveEncoding archiveEncoding
+        IArchiveEncoding archiveEncoding
     )
     {
         try
@@ -26,7 +26,7 @@ internal class RarHeader : IRarHeader
         }
     }
 
-    private RarHeader(RarCrcBinaryReader reader, bool isRar5, ArchiveEncoding archiveEncoding)
+    private RarHeader(RarCrcBinaryReader reader, bool isRar5, IArchiveEncoding archiveEncoding)
     {
         _headerType = HeaderType.Null;
         _isRar5 = isRar5;
@@ -115,7 +115,7 @@ internal class RarHeader : IRarHeader
 
     protected int HeaderSize { get; }
 
-    internal ArchiveEncoding ArchiveEncoding { get; }
+    internal IArchiveEncoding ArchiveEncoding { get; }
 
     /// <summary>
     /// Extra header size.

src/SharpCompress/Common/SevenZip/SevenZipFilePart.cs

@@ -15,7 +15,7 @@ internal class SevenZipFilePart : FilePart
         ArchiveDatabase database,
         int index,
         CFileItem fileEntry,
-        ArchiveEncoding archiveEncoding
+        IArchiveEncoding archiveEncoding
     )
         : base(archiveEncoding)
     {

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

@@ -11,7 +11,7 @@ internal sealed class TarHeader
     internal static readonly DateTime EPOCH = new(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
 
     public TarHeader(
-        ArchiveEncoding archiveEncoding,
+        IArchiveEncoding archiveEncoding,
         TarHeaderWriteFormat writeFormat = TarHeaderWriteFormat.GNU_TAR_LONG_LINK
     )
     {
@@ -30,7 +30,7 @@ internal sealed class TarHeader
     internal DateTime LastModifiedTime { get; set; }
     internal EntryType EntryType { get; set; }
     internal Stream? PackedStream { get; set; }
-    internal ArchiveEncoding ArchiveEncoding { get; }
+    internal IArchiveEncoding ArchiveEncoding { get; }
 
     internal const int BLOCK_SIZE = 512;
 

src/SharpCompress/Common/Tar/TarEntry.cs

@@ -54,7 +54,7 @@ public class TarEntry : Entry
         StreamingMode mode,
         Stream stream,
         CompressionType compressionType,
-        ArchiveEncoding archiveEncoding
+        IArchiveEncoding archiveEncoding
     )
     {
         foreach (var header in TarHeaderFactory.ReadHeader(mode, stream, archiveEncoding))

src/SharpCompress/Common/Tar/TarHeaderFactory.cs

@@ -10,7 +10,7 @@ internal static class TarHeaderFactory
     internal static IEnumerable<TarHeader?> ReadHeader(
         StreamingMode mode,
         Stream stream,
-        ArchiveEncoding archiveEncoding
+        IArchiveEncoding archiveEncoding
     )
     {
         while (true)

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

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -19,6 +20,18 @@ internal class DirectoryEndHeader : ZipHeader
         Comment = reader.ReadBytes(CommentLength);
     }
 
+    internal override async ValueTask Read(AsyncBinaryReader reader)
+    {
+        VolumeNumber = await reader.ReadUInt16Async();
+        FirstVolumeWithDirectory = await reader.ReadUInt16Async();
+        TotalNumberOfEntriesInDisk = await reader.ReadUInt16Async();
+        TotalNumberOfEntries = await reader.ReadUInt16Async();
+        DirectorySize = await reader.ReadUInt32Async();
+        DirectoryStartOffsetRelativeToDisk = await reader.ReadUInt32Async();
+        CommentLength = await reader.ReadUInt16Async();
+        Comment = await reader.ReadBytesAsync(CommentLength);
+    }
+
     public ushort VolumeNumber { get; private set; }
 
     public ushort FirstVolumeWithDirectory { get; private set; }

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

@@ -1,11 +1,12 @@
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
 internal class DirectoryEntryHeader : ZipFileEntry
 {
-    public DirectoryEntryHeader(ArchiveEncoding archiveEncoding)
+    public DirectoryEntryHeader(IArchiveEncoding archiveEncoding)
         : base(ZipHeaderType.DirectoryEntry, archiveEncoding) { }
 
     internal override void Read(BinaryReader reader)
@@ -31,7 +32,37 @@ internal class DirectoryEntryHeader : ZipFileEntry
         var extra = reader.ReadBytes(extraLength);
         var comment = reader.ReadBytes(commentLength);
 
-        // According to .ZIP File Format Specification
+        ProcessReadData(name, extra, comment);
+    }
+
+    internal override async ValueTask Read(AsyncBinaryReader reader)
+    {
+        Version = await reader.ReadUInt16Async();
+        VersionNeededToExtract = await reader.ReadUInt16Async();
+        Flags = (HeaderFlags)await reader.ReadUInt16Async();
+        CompressionMethod = (ZipCompressionMethod)await reader.ReadUInt16Async();
+        OriginalLastModifiedTime = LastModifiedTime = await reader.ReadUInt16Async();
+        OriginalLastModifiedDate = LastModifiedDate = await reader.ReadUInt16Async();
+        Crc = await reader.ReadUInt32Async();
+        CompressedSize = await reader.ReadUInt32Async();
+        UncompressedSize = await reader.ReadUInt32Async();
+        var nameLength = await reader.ReadUInt16Async();
+        var extraLength = await reader.ReadUInt16Async();
+        var commentLength = await reader.ReadUInt16Async();
+        DiskNumberStart = await reader.ReadUInt16Async();
+        InternalFileAttributes = await reader.ReadUInt16Async();
+        ExternalFileAttributes = await reader.ReadUInt32Async();
+        RelativeOffsetOfEntryHeader = await reader.ReadUInt32Async();
+
+        var name = await reader.ReadBytesAsync(nameLength);
+        var extra = await reader.ReadBytesAsync(extraLength);
+        var comment = await reader.ReadBytesAsync(commentLength);
+
+        ProcessReadData(name, extra, comment);
+    }
+
+    private void ProcessReadData(byte[] name, byte[] extra, byte[] comment)
+    {
         //
         // For example: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
         //
@@ -41,8 +72,8 @@ internal class DirectoryEntryHeader : ZipFileEntry
 
         if (Flags.HasFlag(HeaderFlags.Efs))
         {
-            Name = ArchiveEncoding.DecodeUTF8(name);
-            Comment = ArchiveEncoding.DecodeUTF8(comment);
+            Name = ArchiveEncoding.Decode(name, EncodingType.UTF8);
+            Comment = ArchiveEncoding.Decode(comment, EncodingType.UTF8);
         }
         else
         {

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

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -8,4 +9,6 @@ internal class IgnoreHeader : ZipHeader
         : base(type) { }
 
     internal override void Read(BinaryReader reader) { }
+
+    internal override ValueTask Read(AsyncBinaryReader reader) => default;
 }

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

@@ -1,13 +1,12 @@
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
-internal class LocalEntryHeader : ZipFileEntry
+internal class LocalEntryHeader(IArchiveEncoding archiveEncoding)
+    : ZipFileEntry(ZipHeaderType.LocalEntry, archiveEncoding)
 {
-    public LocalEntryHeader(ArchiveEncoding archiveEncoding)
-        : base(ZipHeaderType.LocalEntry, archiveEncoding) { }
-
     internal override void Read(BinaryReader reader)
     {
         Version = reader.ReadUInt16();
@@ -23,7 +22,29 @@ internal class LocalEntryHeader : ZipFileEntry
         var name = reader.ReadBytes(nameLength);
         var extra = reader.ReadBytes(extraLength);
 
-        // According to .ZIP File Format Specification
+        ProcessReadData(name, extra);
+    }
+
+    internal override async ValueTask Read(AsyncBinaryReader reader)
+    {
+        Version = await reader.ReadUInt16Async();
+        Flags = (HeaderFlags)await reader.ReadUInt16Async();
+        CompressionMethod = (ZipCompressionMethod)await reader.ReadUInt16Async();
+        OriginalLastModifiedTime = LastModifiedTime = await reader.ReadUInt16Async();
+        OriginalLastModifiedDate = LastModifiedDate = await reader.ReadUInt16Async();
+        Crc = await reader.ReadUInt32Async();
+        CompressedSize = await reader.ReadUInt32Async();
+        UncompressedSize = await reader.ReadUInt32Async();
+        var nameLength = await reader.ReadUInt16Async();
+        var extraLength = await reader.ReadUInt16Async();
+        var name = await reader.ReadBytesAsync(nameLength);
+        var extra = await reader.ReadBytesAsync(extraLength);
+
+        ProcessReadData(name, extra);
+    }
+
+    private void ProcessReadData(byte[] name, byte[] extra)
+    {
         //
         // For example: https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
         //
@@ -33,7 +54,7 @@ internal class LocalEntryHeader : ZipFileEntry
 
         if (Flags.HasFlag(HeaderFlags.Efs))
         {
-            Name = ArchiveEncoding.DecodeUTF8(name);
+            Name = ArchiveEncoding.Decode(name, EncodingType.UTF8);
         }
         else
         {

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

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -9,4 +10,7 @@ internal class SplitHeader : ZipHeader
         : base(ZipHeaderType.Split) { }
 
     internal override void Read(BinaryReader reader) => throw new NotImplementedException();
+
+    internal override ValueTask Read(AsyncBinaryReader reader) =>
+        throw new NotImplementedException();
 }

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

@@ -1,4 +1,5 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
@@ -26,6 +27,25 @@ internal class Zip64DirectoryEndHeader : ZipHeader
         );
     }
 
+    internal override async ValueTask Read(AsyncBinaryReader reader)
+    {
+        SizeOfDirectoryEndRecord = (long)await reader.ReadUInt64Async();
+        VersionMadeBy = await reader.ReadUInt16Async();
+        VersionNeededToExtract = await reader.ReadUInt16Async();
+        VolumeNumber = await reader.ReadUInt32Async();
+        FirstVolumeWithDirectory = await reader.ReadUInt32Async();
+        TotalNumberOfEntriesInDisk = (long)await reader.ReadUInt64Async();
+        TotalNumberOfEntries = (long)await reader.ReadUInt64Async();
+        DirectorySize = (long)await reader.ReadUInt64Async();
+        DirectoryStartOffsetRelativeToDisk = (long)await reader.ReadUInt64Async();
+        DataSector = await reader.ReadBytesAsync(
+            (int)(
+                SizeOfDirectoryEndRecord
+                - SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS
+            )
+        );
+    }
+
     private const int SIZE_OF_FIXED_HEADER_DATA_EXCEPT_SIGNATURE_AND_SIZE_FIELDS = 44;
 
     public long SizeOfDirectoryEndRecord { get; private set; }

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

@@ -1,12 +1,10 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
-internal class Zip64DirectoryEndLocatorHeader : ZipHeader
+internal class Zip64DirectoryEndLocatorHeader() : ZipHeader(ZipHeaderType.Zip64DirectoryEndLocator)
 {
-    public Zip64DirectoryEndLocatorHeader()
-        : base(ZipHeaderType.Zip64DirectoryEndLocator) { }
-
     internal override void Read(BinaryReader reader)
     {
         FirstVolumeWithDirectory = reader.ReadUInt32();
@@ -14,6 +12,13 @@ internal class Zip64DirectoryEndLocatorHeader : ZipHeader
         TotalNumberOfVolumes = reader.ReadUInt32();
     }
 
+    internal override async ValueTask Read(AsyncBinaryReader reader)
+    {
+        FirstVolumeWithDirectory = await reader.ReadUInt32Async();
+        RelativeOffsetOfTheEndOfDirectoryRecord = (long)await reader.ReadUInt64Async();
+        TotalNumberOfVolumes = await reader.ReadUInt32Async();
+    }
+
     public uint FirstVolumeWithDirectory { get; private set; }
 
     public long RelativeOffsetOfTheEndOfDirectoryRecord { get; private set; }

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

@@ -2,18 +2,14 @@ using System;
 using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
-internal abstract class ZipFileEntry : ZipHeader
+internal abstract class ZipFileEntry(ZipHeaderType type, IArchiveEncoding archiveEncoding)
+    : ZipHeader(type)
 {
-    protected ZipFileEntry(ZipHeaderType type, ArchiveEncoding archiveEncoding)
-        : base(type)
-    {
-        Extra = new List<ExtraData>();
-        ArchiveEncoding = archiveEncoding;
-    }
-
     internal bool IsDirectory
     {
         get
@@ -30,7 +26,7 @@ internal abstract class ZipFileEntry : ZipHeader
 
     internal Stream? PackedStream { get; set; }
 
-    internal ArchiveEncoding ArchiveEncoding { get; }
+    internal IArchiveEncoding ArchiveEncoding { get; } = archiveEncoding;
 
     internal string? Name { get; set; }
 
@@ -44,7 +40,7 @@ internal abstract class ZipFileEntry : ZipHeader
 
     internal long UncompressedSize { get; set; }
 
-    internal List<ExtraData> Extra { get; set; }
+    internal List<ExtraData> Extra { get; set; } = new();
 
     public string? Password { get; set; }
 
@@ -63,6 +59,24 @@ internal abstract class ZipFileEntry : ZipHeader
         return encryptionData;
     }
 
+    internal async ValueTask<PkwareTraditionalEncryptionData> ComposeEncryptionDataAsync(
+        Stream archiveStream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (archiveStream is null)
+        {
+            throw new ArgumentNullException(nameof(archiveStream));
+        }
+
+        var buffer = new byte[12];
+        await archiveStream.ReadFullyAsync(buffer, 0, 12, cancellationToken).ConfigureAwait(false);
+
+        var encryptionData = PkwareTraditionalEncryptionData.ForRead(Password!, this, buffer);
+
+        return encryptionData;
+    }
+
     internal WinzipAesEncryptionData? WinzipAesEncryptionData { get; set; }
 
     /// <summary>

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

@@ -1,18 +1,14 @@
 using System.IO;
+using System.Threading.Tasks;
 
 namespace SharpCompress.Common.Zip.Headers;
 
-internal abstract class ZipHeader
+internal abstract class ZipHeader(ZipHeaderType type)
 {
-    protected ZipHeader(ZipHeaderType type)
-    {
-        ZipHeaderType = type;
-        HasData = true;
-    }
-
-    internal ZipHeaderType ZipHeaderType { get; }
+    internal ZipHeaderType ZipHeaderType { get; } = type;
 
     internal abstract void Read(BinaryReader reader);
+    internal abstract ValueTask Read(AsyncBinaryReader reader);
 
-    internal bool HasData { get; set; }
+    internal bool HasData { get; set; } = true;
 }

src/SharpCompress/Common/Zip/PkwareTraditionalEncryptionData.cs

@@ -8,9 +8,9 @@ internal class PkwareTraditionalEncryptionData
 {
     private static readonly CRC32 CRC32 = new();
     private readonly uint[] _keys = { 0x12345678, 0x23456789, 0x34567890 };
-    private readonly ArchiveEncoding _archiveEncoding;
+    private readonly IArchiveEncoding _archiveEncoding;
 
-    private PkwareTraditionalEncryptionData(string password, ArchiveEncoding archiveEncoding)
+    private PkwareTraditionalEncryptionData(string password, IArchiveEncoding archiveEncoding)
     {
         _archiveEncoding = archiveEncoding;
         Initialize(password);
@@ -103,7 +103,7 @@ internal class PkwareTraditionalEncryptionData
 
     internal byte[] StringToByteArray(string value)
     {
-        var a = _archiveEncoding.GetPasswordEncoding().GetBytes(value);
+        var a = _archiveEncoding.Password.GetBytes(value);
         return a;
     }
 

src/SharpCompress/Common/Zip/SeekableZipFilePart.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 
 namespace SharpCompress.Common.Zip;
@@ -25,9 +27,24 @@ internal class SeekableZipFilePart : ZipFilePart
         return base.GetCompressedStream();
     }
 
+    internal override async ValueTask<Stream?> GetCompressedStreamAsync(
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!_isLocalHeaderLoaded)
+        {
+            await LoadLocalHeaderAsync(cancellationToken);
+            _isLocalHeaderLoaded = true;
+        }
+        return await base.GetCompressedStreamAsync(cancellationToken);
+    }
+
     private void LoadLocalHeader() =>
         Header = _headerFactory.GetLocalHeader(BaseStream, (DirectoryEntryHeader)Header);
 
+    private async ValueTask LoadLocalHeaderAsync(CancellationToken cancellationToken = default) =>
+        Header = await _headerFactory.GetLocalHeaderAsync(BaseStream, (DirectoryEntryHeader)Header);
+
     protected override Stream CreateBaseStream()
     {
         BaseStream.Position = Header.DataStartPosition.NotNull();

src/SharpCompress/Common/Zip/SeekableZipHeaderFactory.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -15,10 +16,77 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
     private const int MAX_SEARCH_LENGTH_FOR_EOCD = 65557;
     private bool _zip64;
 
-    internal SeekableZipHeaderFactory(string? password, ArchiveEncoding archiveEncoding)
+    internal SeekableZipHeaderFactory(string? password, IArchiveEncoding archiveEncoding)
         : base(StreamingMode.Seekable, password, archiveEncoding) { }
 
-    internal IEnumerable<ZipHeader> ReadSeekableHeader(Stream stream)
+    internal async IAsyncEnumerable<ZipHeader> ReadSeekableHeaderAsync(Stream stream)
+    {
+        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);
+            uint 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;
+            }
+        }
+    }
+
+    internal IEnumerable<ZipHeader> ReadSeekableHeader(Stream stream, bool useSync)
     {
         var reader = new BinaryReader(stream);
 
@@ -85,6 +153,73 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         }
     }
 
+    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++)
@@ -98,6 +233,45 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         return true;
     }
 
+    private static async ValueTask SeekBackToHeaderAsync(Stream stream, AsyncBinaryReader reader)
+    {
+        // Minimum EOCD length
+        if (stream.Length < MINIMUM_EOCD_LENGTH)
+        {
+            throw new ArchiveException(
+                "Could not find Zip file Directory at the end of the file. File may be corrupted."
+            );
+        }
+
+        var len =
+            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 = 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)
+        {
+            if (IsMatch(seek, pos_from_end, needle))
+            {
+                stream.Seek(-pos_from_end, SeekOrigin.End);
+                return;
+            }
+        }
+
+        throw new ArchiveException("Failed to locate the Zip Header");
+    }
+
     private static void SeekBackToHeader(Stream stream, BinaryReader reader)
     {
         // Minimum EOCD length
@@ -163,4 +337,31 @@ internal sealed class SeekableZipHeaderFactory : ZipHeaderFactory
         }
         return localEntryHeader;
     }
+
+    internal async ValueTask<LocalEntryHeader> GetLocalHeaderAsync(
+        Stream stream,
+        DirectoryEntryHeader directoryEntryHeader
+    )
+    {
+        stream.Seek(directoryEntryHeader.RelativeOffsetOfEntryHeader, SeekOrigin.Begin);
+        var reader = new AsyncBinaryReader(stream);
+        var signature = await reader.ReadUInt32Async();
+        if (await ReadHeader(signature, reader, _zip64) is not LocalEntryHeader localEntryHeader)
+        {
+            throw new InvalidOperationException();
+        }
+
+        // populate fields only known from the DirectoryEntryHeader
+        localEntryHeader.HasData = directoryEntryHeader.HasData;
+        localEntryHeader.ExternalFileAttributes = directoryEntryHeader.ExternalFileAttributes;
+        localEntryHeader.Comment = directoryEntryHeader.Comment;
+
+        if (FlagUtility.HasFlag(localEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
+        {
+            localEntryHeader.Crc = directoryEntryHeader.Crc;
+            localEntryHeader.CompressedSize = directoryEntryHeader.CompressedSize;
+            localEntryHeader.UncompressedSize = directoryEntryHeader.UncompressedSize;
+        }
+        return localEntryHeader;
+    }
 }

src/SharpCompress/Common/Zip/StreamingZipFilePart.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.Compressors.Deflate;
 using SharpCompress.IO;
@@ -31,6 +33,28 @@ internal sealed class StreamingZipFilePart : ZipFilePart
         return _decompressionStream;
     }
 
+    internal override async ValueTask<Stream?> GetCompressedStreamAsync(
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!Header.HasData)
+        {
+            return Stream.Null;
+        }
+        _decompressionStream = await CreateDecompressionStreamAsync(
+                await GetCryptoStreamAsync(CreateBaseStream(), cancellationToken)
+                    .ConfigureAwait(false),
+                Header.CompressionMethod,
+                cancellationToken
+            )
+            .ConfigureAwait(false);
+        if (LeaveStreamOpen)
+        {
+            return SharpCompressStream.Create(_decompressionStream, leaveOpen: true);
+        }
+        return _decompressionStream;
+    }
+
     internal BinaryReader FixStreamedFileLocation(ref SharpCompressStream rewindableStream)
     {
         if (Header.IsDirectory)

src/SharpCompress/Common/Zip/StreamingZipHeaderFactory.cs

@@ -2,6 +2,9 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using SharpCompress.Common;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -13,7 +16,7 @@ internal class StreamingZipHeaderFactory : ZipHeaderFactory
 
     internal StreamingZipHeaderFactory(
         string? password,
-        ArchiveEncoding archiveEncoding,
+        IArchiveEncoding archiveEncoding,
         IEnumerable<ZipEntry>? entries
     )
         : base(StreamingMode.Streaming, password, archiveEncoding) => _entries = entries;
@@ -200,4 +203,331 @@ internal class StreamingZipHeaderFactory : ZipHeaderFactory
             yield return header;
         }
     }
+
+    /// <summary>
+    /// Reads ZIP headers asynchronously for streams that do not support synchronous reads.
+    /// </summary>
+    internal IAsyncEnumerable<ZipHeader> ReadStreamHeaderAsync(Stream stream) =>
+        new StreamHeaderAsyncEnumerable(this, stream);
+
+    /// <summary>
+    /// Invokes the shared async header parsing logic on the base factory.
+    /// </summary>
+    private ValueTask<ZipHeader?> ReadHeaderAsyncInternal(
+        uint headerBytes,
+        AsyncBinaryReader reader
+    ) => ReadHeader(headerBytes, reader);
+
+    /// <summary>
+    /// Exposes the last parsed local entry header to the async enumerator so it can handle streaming data descriptors.
+    /// </summary>
+    private LocalEntryHeader? LastEntryHeader
+    {
+        get => _lastEntryHeader;
+        set => _lastEntryHeader = value;
+    }
+
+    /// <summary>
+    /// Produces an async enumerator for streaming ZIP headers.
+    /// </summary>
+    private sealed class StreamHeaderAsyncEnumerable : IAsyncEnumerable<ZipHeader>
+    {
+        private readonly StreamingZipHeaderFactory _headerFactory;
+        private readonly Stream _stream;
+
+        public StreamHeaderAsyncEnumerable(StreamingZipHeaderFactory headerFactory, Stream stream)
+        {
+            _headerFactory = headerFactory;
+            _stream = stream;
+        }
+
+        public IAsyncEnumerator<ZipHeader> GetAsyncEnumerator(
+            CancellationToken cancellationToken = default
+        ) => new StreamHeaderAsyncEnumerator(_headerFactory, _stream, cancellationToken);
+    }
+
+    /// <summary>
+    /// Async implementation of <see cref="ReadStreamHeader"/> using <see cref="AsyncBinaryReader"/> to avoid sync reads.
+    /// </summary>
+    private sealed class StreamHeaderAsyncEnumerator : IAsyncEnumerator<ZipHeader>, IDisposable
+    {
+        private readonly StreamingZipHeaderFactory _headerFactory;
+        private readonly SharpCompressStream _rewindableStream;
+        private readonly AsyncBinaryReader _reader;
+        private readonly CancellationToken _cancellationToken;
+        private bool _completed;
+
+        public StreamHeaderAsyncEnumerator(
+            StreamingZipHeaderFactory headerFactory,
+            Stream stream,
+            CancellationToken cancellationToken
+        )
+        {
+            _headerFactory = headerFactory;
+            _rewindableStream = EnsureSharpCompressStream(stream);
+            _reader = new AsyncBinaryReader(_rewindableStream, leaveOpen: true);
+            _cancellationToken = cancellationToken;
+        }
+
+        private ZipHeader? _current;
+
+        public ZipHeader Current =>
+            _current ?? throw new InvalidOperationException("No current header is available.");
+
+        /// <summary>
+        /// Advances to the next ZIP header in the stream, honoring streaming data descriptors where applicable.
+        /// </summary>
+        public async ValueTask<bool> MoveNextAsync()
+        {
+            if (_completed)
+            {
+                return false;
+            }
+
+            while (true)
+            {
+                _cancellationToken.ThrowIfCancellationRequested();
+
+                uint headerBytes;
+                var lastEntryHeader = _headerFactory.LastEntryHeader;
+                if (
+                    lastEntryHeader != null
+                    && FlagUtility.HasFlag(lastEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor)
+                )
+                {
+                    if (lastEntryHeader.Part is null)
+                    {
+                        continue;
+                    }
+
+                    var pos = _rewindableStream.CanSeek ? (long?)_rewindableStream.Position : null;
+
+                    var crc = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+                    if (crc == POST_DATA_DESCRIPTOR)
+                    {
+                        crc = await _reader
+                            .ReadUInt32Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                    }
+                    lastEntryHeader.Crc = crc;
+
+                    //attempt 32bit read
+                    ulong compressedSize = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+                    ulong uncompressedSize = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+                    headerBytes = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+
+                    //check for zip64 sentinel or unexpected header
+                    bool isSentinel =
+                        compressedSize == 0xFFFFFFFF || uncompressedSize == 0xFFFFFFFF;
+                    bool isHeader = headerBytes == 0x04034b50 || headerBytes == 0x02014b50;
+
+                    if (!isHeader && !isSentinel)
+                    {
+                        //reshuffle into 64-bit values
+                        compressedSize = (uncompressedSize << 32) | compressedSize;
+                        uncompressedSize =
+                            ((ulong)headerBytes << 32)
+                            | await _reader
+                                .ReadUInt32Async(_cancellationToken)
+                                .ConfigureAwait(false);
+                        headerBytes = await _reader
+                            .ReadUInt32Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                    }
+                    else if (isSentinel)
+                    {
+                        //standards-compliant zip64 descriptor
+                        compressedSize = await _reader
+                            .ReadUInt64Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                        uncompressedSize = await _reader
+                            .ReadUInt64Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                    }
+
+                    lastEntryHeader.CompressedSize = (long)compressedSize;
+                    lastEntryHeader.UncompressedSize = (long)uncompressedSize;
+
+                    if (pos.HasValue)
+                    {
+                        lastEntryHeader.DataStartPosition = pos - lastEntryHeader.CompressedSize;
+                    }
+                }
+                else if (lastEntryHeader != null && lastEntryHeader.IsZip64)
+                {
+                    if (lastEntryHeader.Part is null)
+                    {
+                        continue;
+                    }
+
+                    var pos = _rewindableStream.CanSeek ? (long?)_rewindableStream.Position : null;
+
+                    headerBytes = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+
+                    _ = await _reader.ReadUInt16Async(_cancellationToken).ConfigureAwait(false); // version
+                    _ = await _reader.ReadUInt16Async(_cancellationToken).ConfigureAwait(false); // flags
+                    _ = await _reader.ReadUInt16Async(_cancellationToken).ConfigureAwait(false); // compressionMethod
+                    _ = await _reader.ReadUInt16Async(_cancellationToken).ConfigureAwait(false); // lastModifiedDate
+                    _ = await _reader.ReadUInt16Async(_cancellationToken).ConfigureAwait(false); // lastModifiedTime
+
+                    var crc = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+
+                    if (crc == POST_DATA_DESCRIPTOR)
+                    {
+                        crc = await _reader
+                            .ReadUInt32Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                    }
+                    lastEntryHeader.Crc = crc;
+
+                    // The DataDescriptor can be either 64bit or 32bit
+                    var compressedSize = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+                    var uncompressedSize = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+
+                    // Check if we have header or 64bit DataDescriptor
+                    var testHeader = !(headerBytes == 0x04034b50 || headerBytes == 0x02014b50);
+
+                    var test64Bit = ((long)uncompressedSize << 32) | compressedSize;
+                    if (test64Bit == lastEntryHeader.CompressedSize && testHeader)
+                    {
+                        lastEntryHeader.UncompressedSize =
+                            (
+                                (long)
+                                    await _reader
+                                        .ReadUInt32Async(_cancellationToken)
+                                        .ConfigureAwait(false) << 32
+                            ) | headerBytes;
+                        headerBytes = await _reader
+                            .ReadUInt32Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                    }
+                    else
+                    {
+                        lastEntryHeader.UncompressedSize = uncompressedSize;
+                    }
+
+                    if (pos.HasValue)
+                    {
+                        lastEntryHeader.DataStartPosition = pos - lastEntryHeader.CompressedSize;
+
+                        // 4 = First 4 bytes of the entry header (i.e. 50 4B 03 04)
+                        _rewindableStream.Position = pos.Value + 4;
+                    }
+                }
+                else
+                {
+                    headerBytes = await _reader
+                        .ReadUInt32Async(_cancellationToken)
+                        .ConfigureAwait(false);
+                }
+
+                _headerFactory.LastEntryHeader = null;
+                var header = await _headerFactory
+                    .ReadHeaderAsyncInternal(headerBytes, _reader)
+                    .ConfigureAwait(false);
+                if (header is null)
+                {
+                    _completed = true;
+                    return false;
+                }
+
+                //entry could be zero bytes so we need to know that.
+                if (header.ZipHeaderType == ZipHeaderType.LocalEntry)
+                {
+                    var localHeader = (LocalEntryHeader)header;
+                    var directoryHeader = _headerFactory._entries?.FirstOrDefault(entry =>
+                        entry.Key == localHeader.Name
+                        && localHeader.CompressedSize == 0
+                        && localHeader.UncompressedSize == 0
+                        && localHeader.Crc == 0
+                        && localHeader.IsDirectory == false
+                    );
+
+                    if (directoryHeader != null)
+                    {
+                        localHeader.UncompressedSize = directoryHeader.Size;
+                        localHeader.CompressedSize = directoryHeader.CompressedSize;
+                        localHeader.Crc = (uint)directoryHeader.Crc;
+                    }
+
+                    // If we have CompressedSize, there is data to be read
+                    if (localHeader.CompressedSize > 0)
+                    {
+                        header.HasData = true;
+                    } // Check if zip is streaming ( Length is 0 and is declared in PostDataDescriptor )
+                    else if (localHeader.Flags.HasFlag(HeaderFlags.UsePostDataDescriptor))
+                    {
+                        var nextHeaderBytes = await _reader
+                            .ReadUInt32Async(_cancellationToken)
+                            .ConfigureAwait(false);
+                        ((IStreamStack)_rewindableStream).Rewind(sizeof(uint));
+
+                        // Check if next data is PostDataDescriptor, streamed file with 0 length
+                        header.HasData = !IsHeader(nextHeaderBytes);
+                    }
+                    else // We are not streaming and compressed size is 0, we have no data
+                    {
+                        header.HasData = false;
+                    }
+                }
+
+                _current = header;
+                return true;
+            }
+        }
+
+        public ValueTask DisposeAsync()
+        {
+            Dispose();
+            return default;
+        }
+
+        /// <summary>
+        /// Disposes the underlying reader (without closing the archive stream).
+        /// </summary>
+        public void Dispose()
+        {
+            _reader.Dispose();
+        }
+
+        /// <summary>
+        /// Ensures the stream is a <see cref="SharpCompressStream"/> so header parsing can use rewind/buffer helpers.
+        /// </summary>
+        private static SharpCompressStream EnsureSharpCompressStream(Stream stream)
+        {
+            if (stream is SharpCompressStream sharpCompressStream)
+            {
+                return sharpCompressStream;
+            }
+
+            // Ensure the stream is already a SharpCompressStream so the buffer/size is set.
+            // The original code wrapped this with RewindableStream; use SharpCompressStream so we can get the buffer size.
+            if (stream is SourceStream src)
+            {
+                return new SharpCompressStream(
+                    stream,
+                    src.ReaderOptions.LeaveStreamOpen,
+                    bufferSize: src.ReaderOptions.BufferSize
+                );
+            }
+
+            throw new ArgumentException("Stream must be a SharpCompressStream", nameof(stream));
+        }
+    }
 }

src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs

@@ -20,7 +20,7 @@ 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);

src/SharpCompress/Common/Zip/ZipFilePart.cs

@@ -2,6 +2,8 @@ using System;
 using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.Compressors;
 using SharpCompress.Compressors.BZip2;
@@ -264,4 +266,244 @@ internal abstract class ZipFilePart : FilePart
         }
         return plainStream;
     }
+
+    internal override async ValueTask<Stream?> GetCompressedStreamAsync(
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (!Header.HasData)
+        {
+            return Stream.Null;
+        }
+        var decompressionStream = await CreateDecompressionStreamAsync(
+                await GetCryptoStreamAsync(CreateBaseStream(), cancellationToken)
+                    .ConfigureAwait(false),
+                Header.CompressionMethod,
+                cancellationToken
+            )
+            .ConfigureAwait(false);
+        if (LeaveStreamOpen)
+        {
+            return SharpCompressStream.Create(decompressionStream, leaveOpen: true);
+        }
+        return decompressionStream;
+    }
+
+    protected async Task<Stream> GetCryptoStreamAsync(
+        Stream plainStream,
+        CancellationToken cancellationToken = default
+    )
+    {
+        var isFileEncrypted = FlagUtility.HasFlag(Header.Flags, HeaderFlags.Encrypted);
+
+        if (Header.CompressedSize == 0 && isFileEncrypted)
+        {
+            throw new NotSupportedException("Cannot encrypt file with unknown size at start.");
+        }
+
+        if (
+            (
+                Header.CompressedSize == 0
+                && FlagUtility.HasFlag(Header.Flags, HeaderFlags.UsePostDataDescriptor)
+            ) || Header.IsZip64
+        )
+        {
+            plainStream = SharpCompressStream.Create(plainStream, leaveOpen: true); //make sure AES doesn't close
+        }
+        else
+        {
+            plainStream = new ReadOnlySubStream(plainStream, Header.CompressedSize); //make sure AES doesn't close
+        }
+
+        if (isFileEncrypted)
+        {
+            switch (Header.CompressionMethod)
+            {
+                case ZipCompressionMethod.None:
+                case ZipCompressionMethod.Shrink:
+                case ZipCompressionMethod.Reduce1:
+                case ZipCompressionMethod.Reduce2:
+                case ZipCompressionMethod.Reduce3:
+                case ZipCompressionMethod.Reduce4:
+                case ZipCompressionMethod.Deflate:
+                case ZipCompressionMethod.Deflate64:
+                case ZipCompressionMethod.BZip2:
+                case ZipCompressionMethod.LZMA:
+                case ZipCompressionMethod.PPMd:
+                {
+                    return new PkwareTraditionalCryptoStream(
+                        plainStream,
+                        await Header
+                            .ComposeEncryptionDataAsync(plainStream, cancellationToken)
+                            .ConfigureAwait(false),
+                        CryptoMode.Decrypt
+                    );
+                }
+
+                case ZipCompressionMethod.WinzipAes:
+                {
+                    if (Header.WinzipAesEncryptionData != null)
+                    {
+                        return new WinzipAesCryptoStream(
+                            plainStream,
+                            Header.WinzipAesEncryptionData,
+                            Header.CompressedSize - 10
+                        );
+                    }
+                    return plainStream;
+                }
+
+                default:
+                {
+                    throw new InvalidOperationException("Header.CompressionMethod is invalid");
+                }
+            }
+        }
+        return plainStream;
+    }
+
+    protected async Task<Stream> CreateDecompressionStreamAsync(
+        Stream stream,
+        ZipCompressionMethod method,
+        CancellationToken cancellationToken = default
+    )
+    {
+        switch (method)
+        {
+            case ZipCompressionMethod.None:
+            {
+                if (Header.CompressedSize is 0)
+                {
+                    return new DataDescriptorStream(stream);
+                }
+
+                return stream;
+            }
+            case ZipCompressionMethod.Shrink:
+            {
+                return new ShrinkStream(
+                    stream,
+                    CompressionMode.Decompress,
+                    Header.CompressedSize,
+                    Header.UncompressedSize
+                );
+            }
+            case ZipCompressionMethod.Reduce1:
+            {
+                return new ReduceStream(stream, Header.CompressedSize, Header.UncompressedSize, 1);
+            }
+            case ZipCompressionMethod.Reduce2:
+            {
+                return new ReduceStream(stream, Header.CompressedSize, Header.UncompressedSize, 2);
+            }
+            case ZipCompressionMethod.Reduce3:
+            {
+                return new ReduceStream(stream, Header.CompressedSize, Header.UncompressedSize, 3);
+            }
+            case ZipCompressionMethod.Reduce4:
+            {
+                return new ReduceStream(stream, Header.CompressedSize, Header.UncompressedSize, 4);
+            }
+            case ZipCompressionMethod.Explode:
+            {
+                return new ExplodeStream(
+                    stream,
+                    Header.CompressedSize,
+                    Header.UncompressedSize,
+                    Header.Flags
+                );
+            }
+
+            case ZipCompressionMethod.Deflate:
+            {
+                return new DeflateStream(stream, CompressionMode.Decompress);
+            }
+            case ZipCompressionMethod.Deflate64:
+            {
+                return new Deflate64Stream(stream, CompressionMode.Decompress);
+            }
+            case ZipCompressionMethod.BZip2:
+            {
+                return new BZip2Stream(stream, CompressionMode.Decompress, false);
+            }
+            case ZipCompressionMethod.LZMA:
+            {
+                if (FlagUtility.HasFlag(Header.Flags, HeaderFlags.Encrypted))
+                {
+                    throw new NotSupportedException("LZMA with pkware encryption.");
+                }
+                var buffer = new byte[4];
+                await stream.ReadFullyAsync(buffer, 0, 4, cancellationToken).ConfigureAwait(false);
+                var version = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(0, 2));
+                var propsSize = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(2, 2));
+                var props = new byte[propsSize];
+                await stream
+                    .ReadFullyAsync(props, 0, propsSize, cancellationToken)
+                    .ConfigureAwait(false);
+                return new LzmaStream(
+                    props,
+                    stream,
+                    Header.CompressedSize > 0 ? Header.CompressedSize - 4 - props.Length : -1,
+                    FlagUtility.HasFlag(Header.Flags, HeaderFlags.Bit1)
+                        ? -1
+                        : Header.UncompressedSize
+                );
+            }
+            case ZipCompressionMethod.Xz:
+            {
+                return new XZStream(stream);
+            }
+            case ZipCompressionMethod.ZStandard:
+            {
+                return new DecompressionStream(stream);
+            }
+            case ZipCompressionMethod.PPMd:
+            {
+                var props = new byte[2];
+                await stream.ReadFullyAsync(props, 0, 2, cancellationToken).ConfigureAwait(false);
+                return new PpmdStream(new PpmdProperties(props), stream, false);
+            }
+            case ZipCompressionMethod.WinzipAes:
+            {
+                var data = Header.Extra.SingleOrDefault(x => x.Type == ExtraDataType.WinZipAes);
+                if (data is null)
+                {
+                    throw new InvalidFormatException("No Winzip AES extra data found.");
+                }
+
+                if (data.Length != 7)
+                {
+                    throw new InvalidFormatException("Winzip data length is not 7.");
+                }
+
+                var compressedMethod = BinaryPrimitives.ReadUInt16LittleEndian(data.DataBytes);
+
+                if (compressedMethod != 0x01 && compressedMethod != 0x02)
+                {
+                    throw new InvalidFormatException(
+                        "Unexpected vendor version number for WinZip AES metadata"
+                    );
+                }
+
+                var vendorId = BinaryPrimitives.ReadUInt16LittleEndian(data.DataBytes.AsSpan(2));
+                if (vendorId != 0x4541)
+                {
+                    throw new InvalidFormatException(
+                        "Unexpected vendor ID for WinZip AES metadata"
+                    );
+                }
+
+                return await CreateDecompressionStreamAsync(
+                    stream,
+                    (ZipCompressionMethod)
+                        BinaryPrimitives.ReadUInt16LittleEndian(data.DataBytes.AsSpan(5)),
+                    cancellationToken
+                );
+            }
+            default:
+            {
+                throw new NotSupportedException("CompressionMethod: " + Header.CompressionMethod);
+            }
+        }
+    }
 }

src/SharpCompress/Common/Zip/ZipHeaderFactory.cs

@@ -1,6 +1,8 @@
 using System;
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
+using SharpCompress;
 using SharpCompress.Common.Zip.Headers;
 using SharpCompress.IO;
 
@@ -21,12 +23,12 @@ internal class ZipHeaderFactory
     protected LocalEntryHeader? _lastEntryHeader;
     private readonly string? _password;
     private readonly StreamingMode _mode;
-    private readonly ArchiveEncoding _archiveEncoding;
+    private readonly IArchiveEncoding _archiveEncoding;
 
     protected ZipHeaderFactory(
         StreamingMode mode,
         string? password,
-        ArchiveEncoding archiveEncoding
+        IArchiveEncoding archiveEncoding
     )
     {
         _mode = mode;
@@ -34,6 +36,82 @@ internal class ZipHeaderFactory
         _archiveEncoding = archiveEncoding;
     }
 
+    protected async ValueTask<ZipHeader?> ReadHeader(
+        uint headerBytes,
+        AsyncBinaryReader reader,
+        bool zip64 = false
+    )
+    {
+        switch (headerBytes)
+        {
+            case ENTRY_HEADER_BYTES:
+            {
+                var entryHeader = new LocalEntryHeader(_archiveEncoding);
+                await entryHeader.Read(reader);
+                await LoadHeaderAsync(entryHeader, reader.BaseStream).ConfigureAwait(false);
+
+                _lastEntryHeader = entryHeader;
+                return entryHeader;
+            }
+            case DIRECTORY_START_HEADER_BYTES:
+            {
+                var entry = new DirectoryEntryHeader(_archiveEncoding);
+                await entry.Read(reader);
+                return entry;
+            }
+            case POST_DATA_DESCRIPTOR:
+            {
+                if (
+                    _lastEntryHeader != null
+                    && FlagUtility.HasFlag(
+                        _lastEntryHeader.NotNull().Flags,
+                        HeaderFlags.UsePostDataDescriptor
+                    )
+                )
+                {
+                    _lastEntryHeader.Crc = await reader.ReadUInt32Async();
+                    _lastEntryHeader.CompressedSize = zip64
+                        ? (long)await reader.ReadUInt64Async()
+                        : await reader.ReadUInt32Async();
+                    _lastEntryHeader.UncompressedSize = zip64
+                        ? (long)await reader.ReadUInt64Async()
+                        : await reader.ReadUInt32Async();
+                }
+                else
+                {
+                    await reader.ReadBytesAsync(zip64 ? 20 : 12);
+                }
+                return null;
+            }
+            case DIGITAL_SIGNATURE:
+                return null;
+            case DIRECTORY_END_HEADER_BYTES:
+            {
+                var entry = new DirectoryEndHeader();
+                await entry.Read(reader);
+                return entry;
+            }
+            case SPLIT_ARCHIVE_HEADER_BYTES:
+            {
+                return new SplitHeader();
+            }
+            case ZIP64_END_OF_CENTRAL_DIRECTORY:
+            {
+                var entry = new Zip64DirectoryEndHeader();
+                await entry.Read(reader);
+                return entry;
+            }
+            case ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR:
+            {
+                var entry = new Zip64DirectoryEndLocatorHeader();
+                await entry.Read(reader);
+                return entry;
+            }
+            default:
+                return null;
+        }
+    }
+
     protected ZipHeader? ReadHeader(uint headerBytes, BinaryReader reader, bool zip64 = false)
     {
         switch (headerBytes)
@@ -205,4 +283,82 @@ internal class ZipHeaderFactory
 
         //}
     }
+
+    /// <summary>
+    /// Loads encryption metadata and stream positioning for a header using async reads where needed.
+    /// </summary>
+    private async ValueTask LoadHeaderAsync(ZipFileEntry entryHeader, Stream stream)
+    {
+        if (FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.Encrypted))
+        {
+            if (
+                !entryHeader.IsDirectory
+                && entryHeader.CompressedSize == 0
+                && FlagUtility.HasFlag(entryHeader.Flags, HeaderFlags.UsePostDataDescriptor)
+            )
+            {
+                throw new NotSupportedException(
+                    "SharpCompress cannot currently read non-seekable Zip Streams with encrypted data that has been written in a non-seekable manner."
+                );
+            }
+
+            if (_password is null)
+            {
+                throw new CryptographicException("No password supplied for encrypted zip.");
+            }
+
+            entryHeader.Password = _password;
+
+            if (entryHeader.CompressionMethod == ZipCompressionMethod.WinzipAes)
+            {
+                var data = entryHeader.Extra.SingleOrDefault(x =>
+                    x.Type == ExtraDataType.WinZipAes
+                );
+                if (data != null)
+                {
+                    var keySize = (WinzipAesKeySize)data.DataBytes[4];
+
+                    var salt = new byte[WinzipAesEncryptionData.KeyLengthInBytes(keySize) / 2];
+                    var passwordVerifyValue = new byte[2];
+                    await stream.ReadExactAsync(salt, 0, salt.Length).ConfigureAwait(false);
+                    await stream.ReadExactAsync(passwordVerifyValue, 0, 2).ConfigureAwait(false);
+
+                    entryHeader.WinzipAesEncryptionData = new WinzipAesEncryptionData(
+                        keySize,
+                        salt,
+                        passwordVerifyValue,
+                        _password
+                    );
+
+                    entryHeader.CompressedSize -= (uint)(salt.Length + 2);
+                }
+            }
+        }
+
+        if (entryHeader.IsDirectory)
+        {
+            return;
+        }
+
+        switch (_mode)
+        {
+            case StreamingMode.Seekable:
+            {
+                entryHeader.DataStartPosition = stream.Position;
+                stream.Position += entryHeader.CompressedSize;
+                break;
+            }
+
+            case StreamingMode.Streaming:
+            {
+                entryHeader.PackedStream = stream;
+                break;
+            }
+
+            default:
+            {
+                throw new InvalidFormatException("Invalid StreamingMode");
+            }
+        }
+    }
 }

src/SharpCompress/Compressors/ADC/ADCBase.cs

@@ -104,7 +104,7 @@ public static class ADCBase
     /// <param name="bufferSize">Max size for decompressed data</param>
     /// <param name="cancellationToken">Cancellation token</param>
     /// <returns>Result containing bytes read and decompressed data</returns>
-    public static async Task<AdcDecompressResult> DecompressAsync(
+    public static async ValueTask<AdcDecompressResult> DecompressAsync(
         byte[] input,
         int bufferSize = 262144,
         CancellationToken cancellationToken = default
@@ -117,7 +117,7 @@ public static class ADCBase
     /// <param name="bufferSize">Max size for decompressed data</param>
     /// <param name="cancellationToken">Cancellation token</param>
     /// <returns>Result containing bytes read and decompressed data</returns>
-    public static async Task<AdcDecompressResult> DecompressAsync(
+    public static async ValueTask<AdcDecompressResult> DecompressAsync(
         Stream input,
         int bufferSize = 262144,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs

@@ -400,7 +400,7 @@ internal class ZlibBaseStream : Stream, IStreamStack
         }
     }
 
-    private async Task finishAsync(CancellationToken cancellationToken = default)
+    private async ValueTask finishAsync(CancellationToken cancellationToken = default)
     {
         if (_z is null)
         {
@@ -646,7 +646,9 @@ internal class ZlibBaseStream : Stream, IStreamStack
         return _encoding.GetString(buffer, 0, buffer.Length);
     }
 
-    private async Task<string> ReadZeroTerminatedStringAsync(CancellationToken cancellationToken)
+    private async ValueTask<string> ReadZeroTerminatedStringAsync(
+        CancellationToken cancellationToken
+    )
     {
         var list = new List<byte>();
         var done = false;
@@ -729,7 +731,9 @@ internal class ZlibBaseStream : Stream, IStreamStack
         return totalBytesRead;
     }
 
-    private async Task<int> _ReadAndValidateGzipHeaderAsync(CancellationToken cancellationToken)
+    private async ValueTask<int> _ReadAndValidateGzipHeaderAsync(
+        CancellationToken cancellationToken
+    )
     {
         var totalBytesRead = 0;
 

src/SharpCompress/Compressors/LZMA/LZ/LzOutWindow.cs

@@ -87,7 +87,7 @@ internal class OutWindow : IDisposable
         _stream = null;
     }
 
-    public async Task ReleaseStreamAsync(CancellationToken cancellationToken = default)
+    public async ValueTask ReleaseStreamAsync(CancellationToken cancellationToken = default)
     {
         await FlushAsync(cancellationToken).ConfigureAwait(false);
         _stream = null;
@@ -112,7 +112,7 @@ internal class OutWindow : IDisposable
         _streamPos = _pos;
     }
 
-    private async Task FlushAsync(CancellationToken cancellationToken = default)
+    private async ValueTask FlushAsync(CancellationToken cancellationToken = default)
     {
         if (_stream is null)
         {
@@ -303,7 +303,7 @@ internal class OutWindow : IDisposable
         return len - size;
     }
 
-    public async Task<int> CopyStreamAsync(
+    public async ValueTask<int> CopyStreamAsync(
         Stream stream,
         int len,
         CancellationToken cancellationToken = default

src/SharpCompress/Compressors/LZMA/LzmaStream.cs

@@ -429,7 +429,7 @@ public class LzmaStream : Stream, IStreamStack
     {
         var controlBuffer = new byte[1];
         await _inputStream
-            .ReadExactlyAsync(controlBuffer, 0, 1, cancellationToken)
+            .ReadExactAsync(controlBuffer, 0, 1, cancellationToken)
             .ConfigureAwait(false);
         var control = controlBuffer[0];
         _inputPosition++;
@@ -458,13 +458,13 @@ public class LzmaStream : Stream, IStreamStack
             _availableBytes = (control & 0x1F) << 16;
             var buffer = new byte[2];
             await _inputStream
-                .ReadExactlyAsync(buffer, 0, 2, cancellationToken)
+                .ReadExactAsync(buffer, 0, 2, cancellationToken)
                 .ConfigureAwait(false);
             _availableBytes += (buffer[0] << 8) + buffer[1] + 1;
             _inputPosition += 2;
 
             await _inputStream
-                .ReadExactlyAsync(buffer, 0, 2, cancellationToken)
+                .ReadExactAsync(buffer, 0, 2, cancellationToken)
                 .ConfigureAwait(false);
             _rangeDecoderLimit = (buffer[0] << 8) + buffer[1] + 1;
             _inputPosition += 2;
@@ -473,7 +473,7 @@ public class LzmaStream : Stream, IStreamStack
             {
                 _needProps = false;
                 await _inputStream
-                    .ReadExactlyAsync(controlBuffer, 0, 1, cancellationToken)
+                    .ReadExactAsync(controlBuffer, 0, 1, cancellationToken)
                     .ConfigureAwait(false);
                 Properties[0] = controlBuffer[0];
                 _inputPosition++;
@@ -502,7 +502,7 @@ public class LzmaStream : Stream, IStreamStack
             _uncompressedChunk = true;
             var buffer = new byte[2];
             await _inputStream
-                .ReadExactlyAsync(buffer, 0, 2, cancellationToken)
+                .ReadExactAsync(buffer, 0, 2, cancellationToken)
                 .ConfigureAwait(false);
             _availableBytes = (buffer[0] << 8) + buffer[1] + 1;
             _inputPosition += 2;

src/SharpCompress/Compressors/LZMA/Utilites/Utils.cs

@@ -53,39 +53,4 @@ internal static class Utils
             throw new InvalidOperationException("Assertion failed.");
         }
     }
-
-    public static void ReadExact(this Stream stream, byte[] buffer, int offset, int length)
-    {
-        if (stream is null)
-        {
-            throw new ArgumentNullException(nameof(stream));
-        }
-
-        if (buffer is null)
-        {
-            throw new ArgumentNullException(nameof(buffer));
-        }
-
-        if (offset < 0 || offset > buffer.Length)
-        {
-            throw new ArgumentOutOfRangeException(nameof(offset));
-        }
-
-        if (length < 0 || length > buffer.Length - offset)
-        {
-            throw new ArgumentOutOfRangeException(nameof(length));
-        }
-
-        while (length > 0)
-        {
-            var fetched = stream.Read(buffer, offset, length);
-            if (fetched <= 0)
-            {
-                throw new EndOfStreamException();
-            }
-
-            offset += fetched;
-            length -= fetched;
-        }
-    }
 }

src/SharpCompress/Compressors/Rar/RarStream.cs

@@ -68,7 +68,7 @@ internal class RarStream : Stream, IStreamStack
         _position = 0;
     }
 
-    public async Task InitializeAsync(CancellationToken cancellationToken = default)
+    public async ValueTask InitializeAsync(CancellationToken cancellationToken = default)
     {
         fetch = true;
         await unpack.DoUnpackAsync(fileHeader, readStream, this, cancellationToken);

src/SharpCompress/Compressors/Xz/MultiByteIntegers.cs

@@ -58,7 +58,7 @@ internal static class MultiByteIntegers
             MaxBytes = 9;
         }
 
-        var LastByte = await ReadByteAsync(reader, cancellationToken).ConfigureAwait(false);
+        var LastByte = await reader.ReadByteAsync(cancellationToken).ConfigureAwait(false);
         var Output = (ulong)LastByte & 0x7F;
 
         var i = 0;
@@ -69,7 +69,7 @@ internal static class MultiByteIntegers
                 throw new InvalidFormatException();
             }
 
-            LastByte = await ReadByteAsync(reader, cancellationToken).ConfigureAwait(false);
+            LastByte = await reader.ReadByteAsync(cancellationToken).ConfigureAwait(false);
             if (LastByte == 0)
             {
                 throw new InvalidFormatException();
@@ -79,37 +79,4 @@ internal static class MultiByteIntegers
         }
         return Output;
     }
-
-    public static async Task<byte> ReadByteAsync(
-        this BinaryReader reader,
-        CancellationToken cancellationToken = default
-    )
-    {
-        var buffer = new byte[1];
-        var bytesRead = await reader
-            .BaseStream.ReadAsync(buffer, 0, 1, cancellationToken)
-            .ConfigureAwait(false);
-        if (bytesRead != 1)
-        {
-            throw new EndOfStreamException();
-        }
-        return buffer[0];
-    }
-
-    public static async Task<byte[]> ReadBytesAsync(
-        this BinaryReader reader,
-        int count,
-        CancellationToken cancellationToken = default
-    )
-    {
-        var buffer = new byte[count];
-        var bytesRead = await reader
-            .BaseStream.ReadAsync(buffer, 0, count, cancellationToken)
-            .ConfigureAwait(false);
-        if (bytesRead != count)
-        {
-            throw new EndOfStreamException();
-        }
-        return buffer;
-    }
 }

src/SharpCompress/Compressors/Xz/XZBlock.cs

@@ -132,7 +132,7 @@ public sealed class XZBlock : XZReadOnlyStream
         _paddingSkipped = true;
     }
 
-    private async Task SkipPaddingAsync(CancellationToken cancellationToken = default)
+    private async ValueTask SkipPaddingAsync(CancellationToken cancellationToken = default)
     {
         var bytes = (BaseStream.Position - _startPosition) % 4;
         if (bytes > 0)
@@ -158,7 +158,7 @@ public sealed class XZBlock : XZReadOnlyStream
         _crcChecked = true;
     }
 
-    private async Task CheckCrcAsync(CancellationToken cancellationToken = default)
+    private async ValueTask CheckCrcAsync(CancellationToken cancellationToken = default)
     {
         var crc = new byte[_checkSize];
         await BaseStream.ReadAsync(crc, 0, _checkSize, cancellationToken).ConfigureAwait(false);
@@ -194,7 +194,7 @@ public sealed class XZBlock : XZReadOnlyStream
         HeaderIsLoaded = true;
     }
 
-    private async Task LoadHeaderAsync(CancellationToken cancellationToken = default)
+    private async ValueTask LoadHeaderAsync(CancellationToken cancellationToken = default)
     {
         await ReadHeaderSizeAsync(cancellationToken).ConfigureAwait(false);
         var headerCache = await CacheHeaderAsync(cancellationToken).ConfigureAwait(false);
@@ -218,7 +218,7 @@ public sealed class XZBlock : XZReadOnlyStream
         }
     }
 
-    private async Task ReadHeaderSizeAsync(CancellationToken cancellationToken = default)
+    private async ValueTask ReadHeaderSizeAsync(CancellationToken cancellationToken = default)
     {
         var buffer = new byte[1];
         await BaseStream.ReadAsync(buffer, 0, 1, cancellationToken).ConfigureAwait(false);
@@ -249,7 +249,7 @@ public sealed class XZBlock : XZReadOnlyStream
         return blockHeaderWithoutCrc;
     }
 
-    private async Task<byte[]> CacheHeaderAsync(CancellationToken cancellationToken = default)
+    private async ValueTask<byte[]> CacheHeaderAsync(CancellationToken cancellationToken = default)
     {
         var blockHeaderWithoutCrc = new byte[BlockHeaderSize - 4];
         blockHeaderWithoutCrc[0] = _blockHeaderSizeByte;

src/SharpCompress/Compressors/Xz/XZFooter.cs

@@ -62,7 +62,7 @@ public class XZFooter
         }
     }
 
-    public async Task ProcessAsync(CancellationToken cancellationToken = default)
+    public async ValueTask ProcessAsync(CancellationToken cancellationToken = default)
     {
         var crc = await _reader
             .BaseStream.ReadLittleEndianUInt32Async(cancellationToken)

src/SharpCompress/Compressors/Xz/XZHeader.cs

@@ -41,7 +41,7 @@ public class XZHeader
         ProcessStreamFlags();
     }
 
-    public async Task ProcessAsync(CancellationToken cancellationToken = default)
+    public async ValueTask ProcessAsync(CancellationToken cancellationToken = default)
     {
         CheckMagicBytes(await _reader.ReadBytesAsync(6, cancellationToken).ConfigureAwait(false));
         await ProcessStreamFlagsAsync(cancellationToken).ConfigureAwait(false);
@@ -65,7 +65,7 @@ public class XZHeader
         }
     }
 
-    private async Task ProcessStreamFlagsAsync(CancellationToken cancellationToken = default)
+    private async ValueTask ProcessStreamFlagsAsync(CancellationToken cancellationToken = default)
     {
         var streamFlags = await _reader.ReadBytesAsync(2, cancellationToken).ConfigureAwait(false);
         var crc = await _reader

src/SharpCompress/Compressors/Xz/XZIndex.cs

@@ -41,7 +41,7 @@ public class XZIndex
         return index;
     }
 
-    public static async Task<XZIndex> FromStreamAsync(
+    public static async ValueTask<XZIndex> FromStreamAsync(
         Stream stream,
         bool indexMarkerAlreadyVerified,
         CancellationToken cancellationToken = default
@@ -71,7 +71,7 @@ public class XZIndex
         VerifyCrc32();
     }
 
-    public async Task ProcessAsync(CancellationToken cancellationToken = default)
+    public async ValueTask ProcessAsync(CancellationToken cancellationToken = default)
     {
         if (!_indexMarkerAlreadyVerified)
         {
@@ -100,7 +100,7 @@ public class XZIndex
         }
     }
 
-    private async Task VerifyIndexMarkerAsync(CancellationToken cancellationToken = default)
+    private async ValueTask VerifyIndexMarkerAsync(CancellationToken cancellationToken = default)
     {
         var marker = await _reader.ReadByteAsync(cancellationToken).ConfigureAwait(false);
         if (marker != 0)
@@ -122,7 +122,7 @@ public class XZIndex
         }
     }
 
-    private async Task SkipPaddingAsync(CancellationToken cancellationToken = default)
+    private async ValueTask SkipPaddingAsync(CancellationToken cancellationToken = default)
     {
         var bytes = (int)(_reader.BaseStream.Position - StreamStartPosition) % 4;
         if (bytes > 0)
@@ -143,7 +143,7 @@ public class XZIndex
         // TODO verify this matches
     }
 
-    private async Task VerifyCrc32Async(CancellationToken cancellationToken = default)
+    private async ValueTask VerifyCrc32Async(CancellationToken cancellationToken = default)
     {
         var crc = await _reader
             .BaseStream.ReadLittleEndianUInt32Async(cancellationToken)

src/SharpCompress/Compressors/Xz/XZStream.cs

@@ -142,7 +142,7 @@ public sealed class XZStream : XZReadOnlyStream, IStreamStack
         HeaderIsRead = true;
     }
 
-    private async Task ReadHeaderAsync(CancellationToken cancellationToken = default)
+    private async ValueTask ReadHeaderAsync(CancellationToken cancellationToken = default)
     {
         Header = await XZHeader
             .FromStreamAsync(BaseStream, cancellationToken)
@@ -153,7 +153,7 @@ public sealed class XZStream : XZReadOnlyStream, IStreamStack
 
     private void ReadIndex() => Index = XZIndex.FromStream(BaseStream, true);
 
-    private async Task ReadIndexAsync(CancellationToken cancellationToken = default) =>
+    private async ValueTask ReadIndexAsync(CancellationToken cancellationToken = default) =>
         Index = await XZIndex
             .FromStreamAsync(BaseStream, true, cancellationToken)
             .ConfigureAwait(false);
@@ -162,7 +162,7 @@ public sealed class XZStream : XZReadOnlyStream, IStreamStack
     private void ReadFooter() => Footer = XZFooter.FromStream(BaseStream);
 
     // TODO verify footer
-    private async Task ReadFooterAsync(CancellationToken cancellationToken = default) =>
+    private async ValueTask ReadFooterAsync(CancellationToken cancellationToken = default) =>
         Footer = await XZFooter
             .FromStreamAsync(BaseStream, cancellationToken)
             .ConfigureAwait(false);
@@ -202,7 +202,7 @@ public sealed class XZStream : XZReadOnlyStream, IStreamStack
         return bytesRead;
     }
 
-    private async Task<int> ReadBlocksAsync(
+    private async ValueTask<int> ReadBlocksAsync(
         byte[] buffer,
         int offset,
         int count,

src/SharpCompress/Compressors/ZStandard/CompressionStream.cs

@@ -77,7 +77,7 @@ public class CompressionStream : Stream
 #if !NETSTANDARD2_0 && !NETFRAMEWORK
     public override async ValueTask DisposeAsync()
 #else
-    public async Task DisposeAsync()
+    public async ValueTask DisposeAsync()
 #endif
     {
         if (compressor == null)
@@ -137,7 +137,7 @@ public class CompressionStream : Stream
 
     private void FlushInternal(ZSTD_EndDirective directive) => WriteInternal(null, directive);
 
-    private async Task FlushInternalAsync(
+    private async ValueTask FlushInternalAsync(
         ZSTD_EndDirective directive,
         CancellationToken cancellationToken = default
     ) => await WriteInternalAsync(null, directive, cancellationToken).ConfigureAwait(false);
@@ -183,7 +183,7 @@ public class CompressionStream : Stream
         CancellationToken cancellationToken = default
     )
 #else
-    private async Task WriteInternalAsync(
+    private async ValueTask WriteInternalAsync(
         ReadOnlyMemory<byte>? buffer,
         ZSTD_EndDirective directive,
         CancellationToken cancellationToken = default
@@ -235,14 +235,16 @@ public class CompressionStream : Stream
             .ConfigureAwait(false);
 #else
 
-    public override Task WriteAsync(
+    public override async Task WriteAsync(
         byte[] buffer,
         int offset,
         int count,
         CancellationToken cancellationToken
-    ) => WriteAsync(new ReadOnlyMemory<byte>(buffer, offset, count), cancellationToken);
+    ) =>
+        await WriteAsync(new ReadOnlyMemory<byte>(buffer, offset, count), cancellationToken)
+            .ConfigureAwait(false);
 
-    public async Task WriteAsync(
+    public async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default
     ) =>

src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs

@@ -177,9 +177,9 @@ public class DecompressionStream : Stream
         int offset,
         int count,
         CancellationToken cancellationToken
-    ) => ReadAsync(new Memory<byte>(buffer, offset, count), cancellationToken);
+    ) => ReadAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask();
 
-    public async Task<int> ReadAsync(
+    public async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
     )

src/SharpCompress/Factories/AceFactory.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Ace.Headers;
@@ -26,12 +27,21 @@ namespace SharpCompress.Factories
             Stream stream,
             string? password = null,
             int bufferSize = ReaderOptions.DefaultBufferSize
-        )
-        {
-            return AceHeader.IsArchive(stream);
-        }
+        ) => AceHeader.IsArchive(stream);
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
             AceReader.Open(stream, options);
+
+        public ValueTask<IAsyncReader> OpenReaderAsync(
+            Stream stream,
+            ReaderOptions? options,
+            CancellationToken cancellationToken = default
+        ) => new(AceReader.Open(stream, options));
+
+        public override ValueTask<bool> IsArchiveAsync(
+            Stream stream,
+            string? password = null,
+            int bufferSize = ReaderOptions.DefaultBufferSize
+        ) => new(IsArchive(stream, password, bufferSize));
     }
 }

src/SharpCompress/Factories/ArcFactory.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Readers;
@@ -42,5 +43,17 @@ namespace SharpCompress.Factories
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
             ArcReader.Open(stream, options);
+
+        public ValueTask<IAsyncReader> OpenReaderAsync(
+            Stream stream,
+            ReaderOptions? options,
+            CancellationToken cancellationToken = default
+        ) => new(ArcReader.Open(stream, options));
+
+        public override ValueTask<bool> IsArchiveAsync(
+            Stream stream,
+            string? password = null,
+            int bufferSize = ReaderOptions.DefaultBufferSize
+        ) => new(IsArchive(stream, password, bufferSize));
     }
 }

src/SharpCompress/Factories/ArjFactory.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.Common.Arj.Headers;
@@ -33,5 +34,17 @@ namespace SharpCompress.Factories
 
         public IReader OpenReader(Stream stream, ReaderOptions? options) =>
             ArjReader.Open(stream, options);
+
+        public ValueTask<IAsyncReader> OpenReaderAsync(
+            Stream stream,
+            ReaderOptions? options,
+            CancellationToken cancellationToken = default
+        ) => new(ArjReader.Open(stream, options));
+
+        public override ValueTask<bool> IsArchiveAsync(
+            Stream stream,
+            string? password = null,
+            int bufferSize = ReaderOptions.DefaultBufferSize
+        ) => new(IsArchive(stream, password, bufferSize));
     }
 }

src/SharpCompress/Factories/Factory.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Common;
 using SharpCompress.IO;
 using SharpCompress.Readers;
@@ -57,6 +59,24 @@ public abstract class Factory : IFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     );
 
+    public abstract ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    );
+
+    /// <inheritdoc/>
+    public virtual ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(IsArchive(stream, password, bufferSize));
+    }
+
     /// <inheritdoc/>
     public virtual FileInfo? GetFilePart(int index, FileInfo part1) => null;
 
@@ -92,4 +112,34 @@ public abstract class Factory : IFactory
 
         return false;
     }
+
+    internal virtual async ValueTask<(bool, IAsyncReader?)> TryOpenReaderAsync(
+        SharpCompressStream stream,
+        ReaderOptions options,
+        CancellationToken cancellationToken
+    )
+    {
+        if (this is IReaderFactory readerFactory)
+        {
+            long pos = ((IStreamStack)stream).GetPosition();
+
+            if (
+                await IsArchiveAsync(
+                    stream,
+                    options.Password,
+                    options.BufferSize,
+                    cancellationToken
+                )
+            )
+            {
+                ((IStreamStack)stream).StackSeek(pos);
+                return (
+                    true,
+                    await readerFactory.OpenReaderAsync(stream, options, cancellationToken)
+                );
+            }
+        }
+
+        return (false, null);
+    }
 }

src/SharpCompress/Factories/GZipFactory.cs

@@ -1,6 +1,8 @@
 using System.Collections.Generic;
 using System.IO;
 using System.IO.Compression;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.GZip;
 using SharpCompress.Archives.Tar;
@@ -46,6 +48,14 @@ public class GZipFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => GZipArchive.IsGZipFile(stream);
 
+    /// <inheritdoc/>
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.IsGZipFileAsync(stream, cancellationToken);
+
     #endregion
 
     #region IArchiveFactory
@@ -54,10 +64,30 @@ public class GZipFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
+
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
+
     /// <inheritdoc/>
     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
+    ) => GZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -66,10 +96,24 @@ public class GZipFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         GZipArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => GZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
+
     #endregion
 
     #region IReaderFactory
@@ -108,6 +152,17 @@ public class GZipFactory
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
         GZipReader.Open(stream, options);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncReader> OpenReaderAsync(
+        Stream stream,
+        ReaderOptions? options,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(GZipReader.Open(stream, options));
+    }
+
     #endregion
 
     #region IWriterFactory
@@ -122,6 +177,17 @@ public class GZipFactory
         return new GZipWriter(stream, new GZipWriterOptions(writerOptions));
     }
 
+    /// <inheritdoc/>
+    public ValueTask<IWriter> OpenAsync(
+        Stream stream,
+        WriterOptions writerOptions,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, writerOptions));
+    }
+
     #endregion
 
     #region IWriteableArchiveFactory

src/SharpCompress/Factories/IFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Readers;
 
 namespace SharpCompress.Factories;
@@ -42,6 +44,20 @@ public interface IFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     );
 
+    /// <summary>
+    /// Returns true if the stream represents an archive of the format defined by this type asynchronously.
+    /// </summary>
+    /// <param name="stream">A stream, pointing to the beginning of the archive.</param>
+    /// <param name="password">optional password</param>
+    /// <param name="bufferSize">buffer size for reading</param>
+    /// <param name="cancellationToken">cancellation token</param>
+    ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    );
+
     /// <summary>
     /// From a passed in archive (zip, rar, 7z, 001), return all parts.
     /// </summary>

src/SharpCompress/Factories/RarFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Rar;
 using SharpCompress.Common;
@@ -47,10 +49,30 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(stream, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
+
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -59,10 +81,24 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(streams, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         RarArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => RarArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
+
     #endregion
 
     #region IReaderFactory
@@ -71,5 +107,16 @@ public class RarFactory : Factory, IArchiveFactory, IMultiArchiveFactory, IReade
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
         RarReader.Open(stream, options);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncReader> OpenReaderAsync(
+        Stream stream,
+        ReaderOptions? options,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(RarReader.Open(stream, options));
+    }
+
     #endregion
 }

src/SharpCompress/Factories/SevenZipFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.SevenZip;
 using SharpCompress.Common;
@@ -42,10 +44,30 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
+
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -54,10 +76,24 @@ public class SevenZipFactory : Factory, IArchiveFactory, IMultiArchiveFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         SevenZipArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => SevenZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
+
     #endregion
 
     #region reader

src/SharpCompress/Factories/TarFactory.cs

@@ -2,6 +2,8 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Tar;
 using SharpCompress.Common;
@@ -59,6 +61,12 @@ public class TarFactory
         int bufferSize = ReaderOptions.DefaultBufferSize
     ) => TarArchive.IsTarFile(stream);
 
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
+
     #endregion
 
     #region IArchiveFactory
@@ -67,10 +75,24 @@ public class TarFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(stream, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -79,10 +101,24 @@ public class TarFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(streams, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         TarArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => TarArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
+
     #endregion
 
     #region IReaderFactory
@@ -234,6 +270,17 @@ public class TarFactory
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
         TarReader.Open(stream, options);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncReader> OpenReaderAsync(
+        Stream stream,
+        ReaderOptions? options,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(TarReader.Open(stream, options));
+    }
+
     #endregion
 
     #region IWriterFactory
@@ -242,6 +289,17 @@ public class TarFactory
     public IWriter Open(Stream stream, WriterOptions writerOptions) =>
         new TarWriter(stream, new TarWriterOptions(writerOptions));
 
+    /// <inheritdoc/>
+    public ValueTask<IWriter> OpenAsync(
+        Stream stream,
+        WriterOptions writerOptions,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, writerOptions));
+    }
+
     #endregion
 
     #region IWriteableArchiveFactory

src/SharpCompress/Factories/ZStandardFactory.cs

@@ -25,4 +25,10 @@ internal class ZStandardFactory : Factory
         string? password = null,
         int bufferSize = 65536
     ) => ZStandardStream.IsZStandard(stream);
+
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
 }

src/SharpCompress/Factories/ZipFactory.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 using SharpCompress.Archives;
 using SharpCompress.Archives.Zip;
 using SharpCompress.Common;
@@ -79,6 +81,55 @@ public class ZipFactory
         return false;
     }
 
+    public override ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize
+    ) => new(IsArchive(stream, password, bufferSize));
+
+    /// <inheritdoc/>
+    public override async ValueTask<bool> IsArchiveAsync(
+        Stream stream,
+        string? password = null,
+        int bufferSize = ReaderOptions.DefaultBufferSize,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        var startPosition = stream.CanSeek ? stream.Position : -1;
+
+        // probe for single volume zip
+
+        if (stream is not SharpCompressStream) // wrap to provide buffer bef
+        {
+            stream = new SharpCompressStream(stream, bufferSize: bufferSize);
+        }
+
+        if (await ZipArchive.IsZipFileAsync(stream, password, bufferSize, cancellationToken))
+        {
+            return true;
+        }
+
+        // probe for a multipart zip
+
+        if (!stream.CanSeek)
+        {
+            return false;
+        }
+
+        stream.Position = startPosition;
+
+        //test the zip (last) file of a multipart zip
+        if (await ZipArchive.IsZipMultiAsync(stream, password, bufferSize, cancellationToken))
+        {
+            return true;
+        }
+
+        stream.Position = startPosition;
+
+        return false;
+    }
+
     /// <inheritdoc/>
     public override FileInfo? GetFilePart(int index, FileInfo part1) =>
         ZipArchiveVolumeFactory.GetFilePart(index, part1);
@@ -91,10 +142,24 @@ public class ZipFactory
     public IArchive Open(Stream stream, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(stream, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        Stream stream,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(stream, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(FileInfo fileInfo, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(fileInfo, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(fileInfo, readerOptions, cancellationToken);
+
     #endregion
 
     #region IMultiArchiveFactory
@@ -103,10 +168,24 @@ public class ZipFactory
     public IArchive Open(IReadOnlyList<Stream> streams, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(streams, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<Stream> streams,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(streams, readerOptions, cancellationToken);
+
     /// <inheritdoc/>
     public IArchive Open(IReadOnlyList<FileInfo> fileInfos, ReaderOptions? readerOptions = null) =>
         ZipArchive.Open(fileInfos, readerOptions);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncArchive> OpenAsync(
+        IReadOnlyList<FileInfo> fileInfos,
+        ReaderOptions? readerOptions = null,
+        CancellationToken cancellationToken = default
+    ) => ZipArchive.OpenAsync(fileInfos, readerOptions, cancellationToken);
+
     #endregion
 
     #region IReaderFactory
@@ -115,6 +194,17 @@ public class ZipFactory
     public IReader OpenReader(Stream stream, ReaderOptions? options) =>
         ZipReader.Open(stream, options);
 
+    /// <inheritdoc/>
+    public ValueTask<IAsyncReader> OpenReaderAsync(
+        Stream stream,
+        ReaderOptions? options,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(ZipReader.Open(stream, options));
+    }
+
     #endregion
 
     #region IWriterFactory
@@ -123,6 +213,17 @@ public class ZipFactory
     public IWriter Open(Stream stream, WriterOptions writerOptions) =>
         new ZipWriter(stream, new ZipWriterOptions(writerOptions));
 
+    /// <inheritdoc/>
+    public ValueTask<IWriter> OpenAsync(
+        Stream stream,
+        WriterOptions writerOptions,
+        CancellationToken cancellationToken = default
+    )
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        return new(Open(stream, writerOptions));
+    }
+
     #endregion
 
     #region IWriteableArchiveFactory

src/SharpCompress/LazyAsyncReadOnlyCollection.cs

@@ -0,0 +1,103 @@
+#nullable disable
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+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 class LazyLoader(
+        LazyAsyncReadOnlyCollection<T> lazyReadOnlyCollection,
+        CancellationToken cancellationToken
+    ) : IAsyncEnumerator<T>
+    {
+        private bool disposed;
+        private int index = -1;
+
+        public ValueTask DisposeAsync()
+        {
+            if (!disposed)
+            {
+                disposed = true;
+            }
+            return default;
+        }
+
+        public async ValueTask<bool> MoveNextAsync()
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            if (index + 1 < lazyReadOnlyCollection.backing.Count)
+            {
+                index++;
+                return true;
+            }
+            if (
+                !lazyReadOnlyCollection.fullyLoaded
+                && await lazyReadOnlyCollection.source.MoveNextAsync()
+            )
+            {
+                lazyReadOnlyCollection.backing.Add(lazyReadOnlyCollection.source.Current);
+                index++;
+                return true;
+            }
+            lazyReadOnlyCollection.fullyLoaded = true;
+            return false;
+        }
+
+        #region IEnumerator<T> Members
+
+        public T Current => lazyReadOnlyCollection.backing[index];
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            if (!disposed)
+            {
+                disposed = true;
+            }
+        }
+
+        #endregion
+    }
+
+    internal async ValueTask EnsureFullyLoaded()
+    {
+        if (!fullyLoaded)
+        {
+            var loader = new LazyLoader(this, CancellationToken.None);
+            while (await loader.MoveNextAsync())
+            {
+                // Intentionally empty
+            }
+            fullyLoaded = true;
+        }
+    }
+
+    internal IEnumerable<T> GetLoaded() => backing;
+
+    #region ICollection<T> Members
+
+    public void Add(T item) => throw new NotSupportedException();
+
+    public void Clear() => throw new NotSupportedException();
+
+    public bool IsReadOnly => true;
+
+    public bool Remove(T item) => throw new NotSupportedException();
+
+    #endregion
+
+    public IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default) =>
+        new LazyLoader(this, cancellationToken);
+}

src/SharpCompress/Polyfills/AsyncEnumerableExtensions.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SharpCompress;
+
+public static class AsyncEnumerableEx
+{
+    public static async IAsyncEnumerable<T> Empty<T>()
+        where T : notnull
+    {
+        await Task.CompletedTask;
+        yield break;
+    }
+}
+
+public static class EnumerableExtensions
+{
+    public static async IAsyncEnumerable<T> ToAsyncEnumerable<T>(this IEnumerable<T> source)
+    {
+        await Task.CompletedTask;
+        foreach (var item in source)
+        {
+            yield return item;
+        }
+    }
+}
+
+public static class AsyncEnumerableExtensions
+{
+    extension<T>(IAsyncEnumerable<T> source)
+        where T : notnull
+    {
+        public async ValueTask<List<T>> ToListAsync()
+        {
+            var list = new List<T>();
+            await foreach (var item in source)
+            {
+                list.Add(item);
+            }
+            return list;
+        }
+
+        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)
+            {
+                if (!predicate(item))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        public async IAsyncEnumerable<T> Where(Func<T, bool> predicate)
+        {
+            await foreach (var item in source)
+            {
+                if (predicate(item))
+                {
+                    yield return item;
+                }
+            }
+        }
+
+        public async ValueTask<T?> FirstOrDefaultAsync()
+        {
+            await foreach (var item in source)
+            {
+                return item; // Returns the very first item found
+            }
+
+            return default; // Returns null/default if the stream is empty
+        }
+
+        public async ValueTask<TAccumulate> Aggregate<TAccumulate>(
+            TAccumulate seed,
+            Func<TAccumulate, T, TAccumulate> func
+        )
+        {
+            TAccumulate result = seed;
+            await foreach (var element in source)
+            {
+                result = func(result, element);
+            }
+            return result;
+        }
+    }
+}

src/SharpCompress/Polyfills/BinaryReaderExtensions.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Buffers;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SharpCompress;
+
+public static class BinaryReaderExtensions
+{
+    extension(BinaryReader reader)
+    {
+        public async ValueTask<byte> ReadByteAsync(CancellationToken cancellationToken = default)
+        {
+            var buffer = new byte[1];
+            await reader
+                .BaseStream.ReadExactAsync(buffer, 0, 1, cancellationToken)
+                .ConfigureAwait(false);
+            return buffer[0];
+        }
+
+        public async ValueTask<byte[]> ReadBytesAsync(
+            int count,
+            CancellationToken cancellationToken = default
+        )
+        {
+            if (count < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(count), "Count must be non-negative.");
+            }
+
+            if (count == 0)
+            {
+                return Array.Empty<byte>();
+            }
+
+            // For small allocations, direct allocation is more efficient than pooling
+            // due to ArrayPool overhead and the need to copy data to return array
+            if (count <= 256)
+            {
+                var bytes = new byte[count];
+                await reader
+                    .BaseStream.ReadExactAsync(bytes, 0, count, cancellationToken)
+                    .ConfigureAwait(false);
+                return bytes;
+            }
+
+            // For larger allocations, use ArrayPool to reduce GC pressure
+            var buffer = ArrayPool<byte>.Shared.Rent(count);
+            try
+            {
+                await reader
+                    .BaseStream.ReadExactAsync(buffer, 0, count, cancellationToken)
+                    .ConfigureAwait(false);
+                var bytes = new byte[count];
+                Array.Copy(buffer, 0, bytes, 0, count);
+                return bytes;
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(buffer);
+            }
+        }
+    }
+}

src/SharpCompress/Polyfills/StreamExtensions.cs

@@ -1,5 +1,3 @@
-#if NETFRAMEWORK || NETSTANDARD2_0
-
 using System;
 using System.Buffers;
 using System.IO;
@@ -8,63 +6,62 @@ using System.Threading.Tasks;
 
 namespace SharpCompress;
 
-internal static class StreamExtensions
+public static class StreamExtensions
 {
-    internal static int Read(this Stream stream, Span<byte> buffer)
+    extension(Stream stream)
     {
-        var temp = ArrayPool<byte>.Shared.Rent(buffer.Length);
-
-        try
+        public void Skip(long advanceAmount)
         {
-            var read = stream.Read(temp, 0, buffer.Length);
-
-            temp.AsSpan(0, read).CopyTo(buffer);
-
-            return read;
-        }
-        finally
-        {
-            ArrayPool<byte>.Shared.Return(temp);
-        }
-    }
-
-    internal static void Write(this Stream stream, ReadOnlySpan<byte> buffer)
-    {
-        var temp = ArrayPool<byte>.Shared.Rent(buffer.Length);
-
-        buffer.CopyTo(temp);
-
-        try
-        {
-            stream.Write(temp, 0, buffer.Length);
-        }
-        finally
-        {
-            ArrayPool<byte>.Shared.Return(temp);
-        }
-    }
-
-    internal static async Task ReadExactlyAsync(
-        this Stream stream,
-        byte[] buffer,
-        int offset,
-        int count,
-        CancellationToken cancellationToken
-    )
-    {
-        var totalRead = 0;
-        while (totalRead < count)
-        {
-            var read = await stream
-                .ReadAsync(buffer, offset + totalRead, count - totalRead, cancellationToken)
-                .ConfigureAwait(false);
-            if (read == 0)
+            if (stream.CanSeek)
             {
-                throw new EndOfStreamException();
+                stream.Position += advanceAmount;
+                return;
+            }
+
+            using var readOnlySubStream = new IO.ReadOnlySubStream(stream, advanceAmount);
+            readOnlySubStream.CopyTo(Stream.Null);
+        }
+
+        public void Skip() => stream.CopyTo(Stream.Null);
+
+        public Task SkipAsync(CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            return stream.CopyToAsync(Stream.Null);
+        }
+
+        internal int Read(Span<byte> buffer)
+        {
+            var temp = ArrayPool<byte>.Shared.Rent(buffer.Length);
+
+            try
+            {
+                var read = stream.Read(temp, 0, buffer.Length);
+
+                temp.AsSpan(0, read).CopyTo(buffer);
+
+                return read;
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(temp);
+            }
+        }
+
+        internal void Write(ReadOnlySpan<byte> buffer)
+        {
+            var temp = ArrayPool<byte>.Shared.Rent(buffer.Length);
+
+            buffer.CopyTo(temp);
+
+            try
+            {
+                stream.Write(temp, 0, buffer.Length);
+            }
+            finally
+            {
+                ArrayPool<byte>.Shared.Return(temp);
             }
-            totalRead += read;
         }
     }
 }
-
-#endif