Question

Hey, I’m having problems compressing files with Ionic.zlib, I’m very new to C# so the problem may be easily solvable. If I compress a large file, let’s say 500kb in size then once the compressed file has reached 65536 bytes it will stop, if I then decompress the file theres a lot of data missing :/. I can fix this by setting the buffer to like 4,000,000, but I heard that it’s best to have it set to 0x4000.

        ZlibStream compressor = new ZlibStream(gsc_stream, CompressionMode.Compress, CompressionLevel.BestCompression, true);
        byte[] buffer = new byte[0x4000];
        Int32 n;

        int previous = Convert.ToInt32(zone.Position);

        while ((n = compressor.Read(buffer, 0, buffer.Length)) != 0)
        {
            zone.Write(buffer, 0, n);

        }
        zone.Flush();
        compressor.Flush();

Answer 1

Looks like you have it the other way around.
If you’re trying to compress the file in the stream gsc_stream and write the result into the stream zone then correct code would be:

using (ZlibStream compressor = new ZlibStream(zone, CompressionMode.Compress, CompressionLevel.BestCompression, true))
{
    byte[] buffer = new byte[0x4000];
    int n;
    while ((n = gsc_stream.Read(buffer, 0, buffer.Length)) != 0)
    {
        compressor.Write(buffer, 0, n);
    }
    zone.Flush();
    compressor.Flush();
}