public LzhamStream(Stream stream, CompressionParameters mode, bool leaveOpen)
{
if (stream == null)
throw new ArgumentNullException(nameof(stream));
if (!stream.CanWrite)
throw new ArgumentException("The base stream is not writeable", nameof(stream));
_stream = stream;
_leaveOpen = leaveOpen;
_buffer = new byte[DefaultBufferSize];
_compressionHandle = LzhamInterop.CompressInit(mode);
if (_compressionHandle.IsInvalid)
{
throw new ApplicationException("Could not initialize compression stream with specified parameters");
}
}
private static extern unsafe int lzham_compress2(CompressionHandle state, byte* inBuf, ref IntPtr inBufSize, byte* outBuf,
ref IntPtr outBufSize, Flush flushType);
private static extern unsafe int lzham_compress(CompressionHandle state, byte* inBuf, ref IntPtr inBufSize, byte* outBuf,
ref IntPtr outBufSize, int noMoreInputBytesFlag);
public static unsafe CompressStatus Compress2(CompressionHandle state, byte[] inBuf, ref int inBufSize, int inBufOffset, byte[] outBuf, ref int outBufSize, int outBufOffset, Flush flushType)
{
if (inBufOffset + inBufSize > inBuf.Length)
{
throw new ArgumentException("Offset plus count is larger than the length of array", nameof(inBuf));
}
if (outBufOffset + outBufSize > outBuf.Length)
{
throw new ArgumentException("Offset plus count is larger than the length of array", nameof(outBuf));
}
fixed (byte* inBytes = inBuf)
fixed (byte* outBytes = outBuf)
{
IntPtr inSize = new IntPtr(inBufSize);
IntPtr outSize = new IntPtr(outBufSize);
CompressStatus result = (CompressStatus)lzham_compress2(state, inBytes+inBufOffset, ref inSize, outBytes+outBufOffset, ref outSize, flushType);
inBufSize = inSize.ToInt32();
outBufSize = outSize.ToInt32();
return result;
}
}
public static CompressionHandle CompressReinit(CompressionHandle state)
{
return lzham_compress_reinit(state);
}
private static extern CompressionHandle lzham_compress_reinit(CompressionHandle state);
