AdvSim.Compression

The AdvSim.Compression NuGet contains a set of compression wrapper functions which are reusable, configured with sane defaults and are easy to use. Further details are available under the different subheadings below.

• GZip
• LZMA
• LZNT1
• Direct3D
• Cabinet

NuGet Compatibility

The AdvSim.Compression NuGet supports a wide variety of .Net versions. Due to native API usage, a number of the modules are available only on NETFRAMEWORK, these have been highlighted in the usage documentation below.

NuGet URL: https://www.nuget.org/packages/AdvSim.Compression

Usage

GZip

GZip is a standard wrapper around System.IO.Compression.

// Compression
//====================

// Compress Byte[] to Byte[]
Byte[] bCompressed = GZip.GzipCompress(bUncompressedBuffer);
// Compress File to Byte[]
Byte[] bCompressed = GZip.GzipCompress(sFilePath);
// Compress Byte[] to File
GZip.GzipCompress(bUncompressedBuffer, sFilePath);
// Compress File to File
GZip.GzipCompress(sFilePath, sOutputFilePath);

// Decompression
//====================

// Decompress Byte[] to Byte[]
Byte[] bDecompressed = GZip.GzipDecompress(bCompressedBuffer);
// Decompress File to Byte[]
Byte[] bDecompressed = GZip.GzipDecompress(sFilePath);
// Decompress Byte[] to File
GZip.GzipDecompress(bUncompressedBuffer, sFilePath);
// Decompress File to File
GZip.GzipDecompress(sFilePath, sOutputFilePath);

LZMA

LZMA is a wrapper built on the 7z sdk provided here under public domain licencing.

// Compression
//====================

// Compress Byte[] to Byte[]
Byte[] bCompressed = LZMA.LZMACompress(bUncompressedBuffer);
// Compress File to Byte[]
Byte[] bCompressed = LZMA.LZMACompress(sFilePath);
// Compress Byte[] to File
LZMA.LZMACompress(bUncompressedBuffer, sFilePath);
// Compress File to File
LZMA.LZMACompress(sFilePath, sOutputFilePath);

// Decompression
//====================

// Decompress Byte[] to Byte[]
Byte[] bDecompressed = LZMA.LZMACompress(bCompressedBuffer);
// Decompress File to Byte[]
Byte[] bDecompressed = LZMA.LZMACompress(sFilePath);
// Decompress Byte[] to File
LZMA.LZMACompress(bUncompressedBuffer, sFilePath);
// Decompress File to File
LZMA.LZMACompress(sFilePath, sOutputFilePath);

LZNT1

LZNT is a wrapper around ntdll!RtlCompressBuffer and ntdll!RtlDecompressBuffer. More details about LZNT1 are available here. The compression workspace here is using the Standard Engine.

// Compression
//====================

// Compress Byte[] to Byte[]
Byte[] bCompressed = LZNT.RtlCompressBuffer(bUncompressedBuffer);
// Compress File to Byte[]
Byte[] bCompressed = LZNT.RtlCompressBuffer(sFilePath);
// Compress Byte[] to File
LZNT.RtlCompressBuffer(bUncompressedBuffer, sFilePath);
// Compress File to File
LZNT.RtlCompressBuffer(sFilePath, sOutputFilePath);

// Decompression
//====================

// Decompress Byte[] to Byte[]
Byte[] bDecompressed = LZNT.RtlDecompressBuffer(bCompressedBuffer);
// Decompress File to Byte[]
Byte[] bDecompressed = LZNT.RtlDecompressBuffer(sFilePath);
// Decompress Byte[] to File
LZNT.RtlDecompressBuffer(bUncompressedBuffer, sFilePath);
// Decompress File to File
LZNT.RtlDecompressBuffer(sFilePath, sOutputFilePath);

Direct3D

Direct3D is using shader compression from D3DCompiler_47!D3DCompressShaders and D3DCompiler_47!D3DDecompressShaders. Compression here is really good and I want to give a shout-out to @modexpblog for documenting this here and helping me do some debugging <3!

// Compression
//====================

// Compress Byte[] to Byte[]
Byte[] bCompressed = Direct3D.D3DCompressShaders(bUncompressedBuffer);
// Compress File to Byte[]
Byte[] bCompressed = Direct3D.D3DCompressShaders(sFilePath);
// Compress Byte[] to File
Direct3D.D3DCompressShaders(bUncompressedBuffer, sFilePath);
// Compress File to File
Direct3D.D3DCompressShaders(sFilePath, sOutputFilePath);

// Decompression
//====================

// Decompress Byte[] to Byte[]
Byte[] bDecompressed = Direct3D.D3DDecompressShaders(bCompressedBuffer);
// Decompress File to Byte[]
Byte[] bDecompressed = Direct3D.D3DDecompressShaders(sFilePath);
// Decompress Byte[] to File
Direct3D.D3DDecompressShaders(bUncompressedBuffer, sFilePath);
// Decompress File to File
Direct3D.D3DDecompressShaders(sFilePath, sOutputFilePath);

Cabinet

Cabinet is built mainly around cabinet!Compress and cabinet!Decompress. These functions are actually exposed through managed code as well, within Windows.Storage.Compression, however this namespace is tied to the Universal Windows Platform (UWP) making it not practicable.

The cabinet wrapper functions are able to use various types of compression. The Enum below lists the supported compression types.

public enum CompressionAlgorithm : UInt32  
{  
  COMPRESS_ALGORITHM_MSZIP = 2,  
  COMPRESS_ALGORITHM_XPRESS = 3,  
  COMPRESS_ALGORITHM_XPRESS_HUFF = 4,  
  COMPRESS_ALGORITHM_LZMS = 5  
}

Usage is very similar to the other wrappers in this library.

// Compression
//====================

// Compress Byte[] to Byte[]
Byte[] bCompressed = Cabinet.CompressStorage(bUncompressedBuffer, eAlgorithm);
// Compress File to Byte[]
Byte[] bCompressed = Cabinet.CompressStorage(sFilePath, eAlgorithm);
// Compress Byte[] to File
Cabinet.CompressStorage(bUncompressedBuffer, sFilePath, eAlgorithm);
// Compress File to File
Cabinet.CompressStorage(sFilePath, sOutputFilePath, eAlgorithm);

// Decompression
//====================

// Decompress Byte[] to Byte[]
Byte[] bDecompressed = Cabinet.DecompressStorage(bCompressedBuffer, eAlgorithm);
// Decompress File to Byte[]
Byte[] bDecompressed = Cabinet.DecompressStorage(sFilePath, eAlgorithm);
// Decompress Byte[] to File
Cabinet.DecompressStorage(bUncompressedBuffer, sFilePath, eAlgorithm);
// Decompress File to File
Cabinet.DecompressStorage(sFilePath, sOutputFilePath, eAlgorithm);