public static byte[] DecompressBytes(byte[] data, int offset, int count)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count + offset > data.Length)
{
throw new ArgumentOutOfRangeException(nameof(count), "offset+count > data.length");
}
var _lzma_stream = new lzma_stream();
var ret = Native.lzma_auto_decoder(_lzma_stream, ulong.MaxValue, Native.LZMA_CONCATENATED);
if (ret == lzma_ret.LZMA_OK)
{
var decompressed = CodeBuffer(_lzma_stream, data, offset, count);
Native.lzma_end(_lzma_stream);
return(decompressed);
}
throw new Exception($"Can not create lzma stream: {ret}");
}
private const int BUFSIZE = 1024 * 512; // for decompress and read operation, a relatively large buffer is reasonable
private void Init()
{
var r = Native.lzma_auto_decoder(_lzma_stream, ulong.MaxValue, Native.LZMA_CONCATENATED);
if (r != lzma_ret.LZMA_OK)
{
throw new Exception($"Can not create lzma stream: {r}");
}
_inbuf = Marshal.AllocHGlobal(BUFSIZE);
_outbuf = Marshal.AllocHGlobal(BUFSIZE);
// init lzma_stream
_lzma_stream.next_in = _inbuf;
_lzma_stream.next_out = _outbuf;
_lzma_stream.avail_in = UIntPtr.Zero;
_lzma_stream.avail_out = (UIntPtr)BUFSIZE;
}
