private Span <byte> DecompressNative(ReadOnlySpan <byte> src, int decompressBound)
{
fixed(byte *srcPtr = src)
{
var buffer = new byte[decompressBound];
fixed(byte *decompressedBufferNativePtr = buffer)
{
var dctx = ExternMethods.ZSTD_createDCtx();
try
{
var length = ExternMethods.ZSTD_decompressDCtx(dctx,
(IntPtr)decompressedBufferNativePtr,
(nuint)buffer.Length,
(IntPtr)srcPtr, (nuint)src.Length);
return(new Span <byte>(buffer, 0, (int)length));
}
finally
{
ExternMethods.ZSTD_freeDCtx(dctx);
}
}
}
}
static unsafe void Test2()
{
var cctx = ExternMethods.ZSTD_createCCtx();
var dctx = ExternMethods.ZSTD_createDCtx();
var src = File.ReadAllBytes("dickens");
var dest = new byte[ExternMethods.ZSTD_compressBound((nuint)src.Length)];
var uncompressed = new byte[src.Length];
fixed(byte *dstPtr = dest)
fixed(byte *srcPtr = src)
fixed(byte *uncompressedPtr = uncompressed)
{
var compressedLength = ExternMethods.ZSTD_compressCCtx(cctx, (IntPtr)dstPtr, (nuint)dest.Length, (IntPtr)srcPtr, (nuint)src.Length,
level);
var decompressedLength = ExternMethods.ZSTD_decompressDCtx(dctx, (IntPtr)uncompressedPtr, (nuint)uncompressed.Length, (IntPtr)dstPtr, compressedLength);
Console.WriteLine($"{compressedLength} {decompressedLength} {src.Length}");
}
ExternMethods.ZSTD_freeCCtx(cctx);
ExternMethods.ZSTD_freeDCtx(dctx);
}