private int Decompress(ArraySegment <byte> src, byte[] dst, int offset, bool bufferSizePrecheck = true)
{
if (offset < 0 || offset >= dst.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (src.Count == 0)
{
return(0);
}
int dstCapacity = dst.Length - offset;
using (var srcPtr = new ArraySegmentPtr(src)) {
if (bufferSizePrecheck)
{
ulong expectedDstSize = ExternMethods.ZSTD_getDecompressedSize(srcPtr, (size_t)src.Count);
if ((int)expectedDstSize > dstCapacity)
#if NETSTANDARD2_0
{ throw new OutOfMemoryException("Buffer size is less than specified decompressed data size"); }
#else
{ throw new InsufficientMemoryException("Buffer size is less than specified decompressed data size"); }
#endif
}
size_t dstSize;
using (var dstPtr = new ArraySegmentPtr(new ArraySegment <byte>(dst, offset, dstCapacity)))
dstSize = ExternMethods.ZSTD_decompressDCtx(dctx, dstPtr, (size_t)dstCapacity, srcPtr, (size_t)src.Count).EnsureZstdSuccess();
return((int)dstSize);
}
}
public static size_t EnsureZstdSuccess(this size_t returnValue)
{
if (ExternMethods.ZSTD_isError(returnValue) != 0)
{
ThrowException(returnValue, Marshal.PtrToStringAnsi(ExternMethods.ZSTD_getErrorName(returnValue)));
}
return(returnValue);
}
private void Dispose(bool disposing)
{
if (disposed)
{
return;
}
ExternMethods.ZSTD_freeDCtx(dctx);
disposed = true;
}
private int Compress(ArraySegment <byte> src, byte[] dst, int offset)
{
if (offset < 0 || offset >= dst.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (src.Count == 0)
{
return(0);
}
int dstCapacity = dst.Length - offset;
size_t dstSize;
using (var srcPtr = new ArraySegmentPtr(src))
using (var dstPtr = new ArraySegmentPtr(new ArraySegment <byte>(dst, offset, dstCapacity)))
dstSize = ExternMethods.ZSTD_compressCCtx(cctx, dstPtr, (size_t)dstCapacity, srcPtr, (size_t)src.Count, compressionLevel).EnsureZstdSuccess();
return((int)dstSize);
}
private static ulong GetDecompressedSize(ArraySegment <byte> src)
{
using (var srcPtr = new ArraySegmentPtr(src))
return(ExternMethods.ZSTD_getDecompressedSize(srcPtr, (size_t)src.Count));
}
public Decompressor()
{
dctx = ExternMethods.ZSTD_createDCtx().EnsureZstdSuccess();
}
private static int GetCompressBound(int size)
{
return((int)ExternMethods.ZSTD_compressBound((size_t)size));
}
public Compressor(int compressionLevel)
{
this.compressionLevel = compressionLevel;
cctx = ExternMethods.ZSTD_createCCtx().EnsureZstdSuccess();
}