Frame decompression with LZ4Stream.Decode seems to ignore all blocks after the first one about k4os.compression.lz4 HOT 3 CLOSED

It is not obvious, but this stream uses "interactive" reading.

If you look at documentation for Stream.Read you will find that it may read less than requested: "Returns: The total number of bytes read into the buffer. This can be less than the number of bytes requested if that many bytes are not currently available, or zero (0) if the end of the stream has been reached."

LZ4InputStream tries to return to you as quickly as possible and not block. In practice, it means that is will return some data on block boundary, and you need another read to read the rest.

If you don't want to handle it yourself, you can use this helper method:

public int FullBlockRead(Stream stream, byte[] buffer, int offset, int length)
{
	var total = 0;
	while (length > 0)
	{
		var read = stream.Read(buffer, offset, length);
		if (read == 0) break;

		offset += read;
		length -= read;
		total += read;
	}

	return total;
}

from k4os.compression.lz4.

Thank you for the clarification- it wasn’t obvious, you’re right. I’ll give that a try and report back.

Thanks-

from k4os.compression.lz4.

That does indeed cure it. Thank you so much for the tip, it was driving me crazy. :-)

from k4os.compression.lz4.