/// <summary>
/// Fills or refills the read buffer.
/// </summary>
private void Fill()
{
int headerLength = m_targetStream.Read(m_header, 0, HeaderSize);
// the normal end is here
if (headerLength == 0)
{
m_unpackedBuffer = null;
return;
}
if (headerLength != HeaderSize)
{
throw new InvalidDataException("input buffer corrupted (header)");
}
int sizeCompressed = Lz4.GetCompressedSize(m_header);
if (m_readBuffer == null || m_readBuffer.Length < (sizeCompressed + HeaderSize))
{
m_readBuffer = new byte[sizeCompressed + HeaderSize];
}
Buffer.BlockCopy(m_header, 0, m_readBuffer, 0, HeaderSize);
int bodyLength = m_targetStream.Read(m_readBuffer, HeaderSize, sizeCompressed);
if (bodyLength != sizeCompressed)
{
throw new InvalidDataException("input buffer corrupted (body)");
}
// decompress
m_unpackedLength = Lz4.Decompress(m_readBuffer, 0, ref m_unpackedBuffer);
m_unpackedOffset = 0;
}
/// <summary>
/// Clears all buffers for this stream and causes any buffered data to be written to the underlying device.
/// </summary>
/// <exception cref="T:System.IO.IOException">
/// An I/O error occurs.
/// </exception>
public override void Flush()
{
if (m_writeBufferOffset > 0)
{
int sz = Lz4.Compress(m_writeBuffer, 0, m_writeBufferOffset, ref m_compressedBuffer, m_compressionMode);
m_targetStream.Write(m_compressedBuffer, 0, sz);
m_writeBufferOffset = 0;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ZlibCompressionStream" /> class.
/// </summary>
/// <param name="targetStream">The target.</param>
/// <param name="bufferSize">Size of the buffer.</param>
/// <param name="closeStream">The close stream.</param>
public Lz4CompressionStream(Stream targetStream, int bufferSize, Lz4Mode mode = Lz4Mode.Fast, bool closeStream = false)
: this(targetStream, new byte[bufferSize], new byte[Lz4.LZ4_compressBound(bufferSize)], mode, closeStream)
{
}
