NativeSharpZlib

A simple zlib wrapper with NativeAOT support and transparent C lib build.

Another zlib wrapper for C#, as there wasn't one where you'd be able to set concrete de/compress block sizes, which is crucial for decompressing certain encrypted content.

Current zlib version: 1.2.5.1 (eventually to be updated)

Supported runtimes:

• win-x64
• win-x86
• linux-x64
• linux-arm
• linux-arm64
• browser-wasm

Why not 1.2.7-1.3.1?

WebAssembly build fails to compile there due to CMake issues:

ninja: error: build.ninja:332: multiple rules generate libz.a

Why not 1.2.5.2-1.2.6.1?

Windows build fails to compile there due to:

zlib-1.2.5.3\test\example.c(8,10): error C1083: Cannot open include file: 'zlib.h': No such file or directory [D:\a\NativeSharpZlib\NativeSharpZlib\zlib-1.2.5.3\build\example.vcxproj]

Usage

There are known issues with CopyTo.

var data = Encoding.UTF8.GetBytes("Hello, World!");

using var ms = new MemoryStream();
using (var compressStream = new NativeZlibStream(ms, CompressionMode.Compress, leaveOpen: true))
{
    compressStream.Write(data, 0, data.Length);
}

ms.Position = 0;

using var decompressStream = new NativeZlibStream(ms, CompressionMode.Decompress);
var buffer = new byte[256];
var read = decompressStream.Read(buffer, 0, buffer.Length);

Console.WriteLine(Encoding.UTF8.GetString(buffer, 0, read));

You can also specify block sizes and compression level in NativeZlibOptions.

using var zlibStream = new NativeZlibStream(stream, CompressionMode.Compress, new NativeZlibOptions()
{
    CompressedBlockSize = 512,
    UncompressedBlockSize = 2048,
    CompressionLevel = 9,
});