public static int Compress(ReadOnlySpan <byte> src, Span <byte> dst, CompressionDictionary dictionary)
{
if (_threadCompressContext == null)
_threadCompressContext = new CompressContext();
fixed(byte *srcPtr = src)
fixed(byte *dstPtr = dst)
{
UIntPtr result;
if (dictionary == null || dictionary.Compression == null)
{
result = ZSTD_compressCCtx(_threadCompressContext.Compression, dstPtr, (UIntPtr)dst.Length,
srcPtr, (UIntPtr)src.Length, 3);
}
else
{
result = ZSTD_compress_usingCDict(_threadCompressContext.Compression, dstPtr,
(UIntPtr)dst.Length, srcPtr, (UIntPtr)src.Length, dictionary.Compression);
}
AssertSuccess(result, dictionary);
return((int)result);
}
}
private static void AssertSuccess(UIntPtr v, CompressionDictionary dictionary)
{
if (ZSTD_isError(v) == 0)
{
return;
}
string ptrToStringAnsi = Marshal.PtrToStringAnsi(ZSTD_getErrorName(v));
if (dictionary != null)
{
throw new InvalidOperationException(ptrToStringAnsi + " on " + dictionary);
}
throw new InvalidOperationException(ptrToStringAnsi);
}
public static int Compress(byte *src, int srcLen, byte *dst, int dstLen, CompressionDictionary dictionary)
{
_threadCompressContext ??= new CompressContext();
{
UIntPtr result;
if (dictionary == null || dictionary.Compression == null)
{
result = ZSTD_compressCCtx(_threadCompressContext.Compression, dst, (UIntPtr)dstLen,
src, (UIntPtr)srcLen, 3);
}
else
{
result = ZSTD_compress_usingCDict(_threadCompressContext.Compression, dst,
(UIntPtr)dstLen, src, (UIntPtr)srcLen, dictionary.Compression);
}
AssertSuccess(result, dictionary);
return((int)result);
}
}
