Interop.cs

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using System.IO.Compression;
using System.Runtime.InteropServices;
 
internal static class Interop
{
    internal static class zlib
    {
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_DeflateInit2_")]
        internal unsafe static extern ZLibNative.ErrorCode DeflateInit2_(ZLibNative.ZStream* stream, ZLibNative.CompressionLevel level, ZLibNative.CompressionMethod method, int windowBits, int memLevel, ZLibNative.CompressionStrategy strategy);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_Deflate")]
        internal unsafe static extern ZLibNative.ErrorCode Deflate(ZLibNative.ZStream* stream, ZLibNative.FlushCode flush);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_DeflateEnd")]
        internal unsafe static extern ZLibNative.ErrorCode DeflateEnd(ZLibNative.ZStream* stream);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_InflateInit2_")]
        internal unsafe static extern ZLibNative.ErrorCode InflateInit2_(ZLibNative.ZStream* stream, int windowBits);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_Inflate")]
        internal unsafe static extern ZLibNative.ErrorCode Inflate(ZLibNative.ZStream* stream, ZLibNative.FlushCode flush);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_InflateEnd")]
        internal unsafe static extern ZLibNative.ErrorCode InflateEnd(ZLibNative.ZStream* stream);
 
        [DllImport("System.IO.Compression.Native", EntryPoint = "CompressionNative_Crc32")]
        internal unsafe static extern uint crc32(uint crc, byte* buffer, int len);
    }
}