How to achieve minimum size when compressing small amount of data lossless?

  1. I don’t understand the answer to ”Why does gzip/deflate compressing a small file result in many trailing zeroes?” (Why does gzip/deflate compressing a small file result in many trailing zeroes?)
  2. How would you go about compressing small amount of data ½-2 Kbyte to minimum size in a .NET-environment? (Runtime is not an issue for me. Can I trade speed for size? Should I use 3rd party products? Developer license fees are OK, but runtime license not.)
  3. Any suggestions about how I can improve the code below for:
    (a) Higher compression ratio?
    (b) More proper use of streams?

Here is the C#-code that needs to be improved:

private static byte[] SerializeAndCompress(MyClass myObject) { using (var inStream = new System.IO.MemoryStream()) { Serializer.Serialize< MyClass >(inStream, myObject); // PROTO-buffer serialization. (Code not included here.) byte[] gZipBytearray = GZipCompress(inStream); return gZipBytearray; } } private static Byte[] GZipCompress(MemoryStream inStream) { inStream.Position = 0; byte[] byteArray; { using (MemoryStream outStream = new MemoryStream()) { bool LeaveOutStreamOpen = true; using (GZipStream compressStream = new GZipStream(outStream, CompressionMode.Compress, LeaveOutStreamOpen)) { // Copy the input stream into the compression stream. // inStream.CopyTo(Compress); TODO: "Uncomment" this line and remove the next one after upgrade to .NET 4 or later. CopyFromStreamToStream(inStream, compressStream); } byteArray = CreateByteArrayFromStream(outStream); // outStream is complete first after compressStream have been closed. } } return byteArray; } private static void CopyFromStreamToStream(Stream sourceStream, Stream destinationStream) { byte[] buffer = new byte[4096]; int numRead; while ((numRead = sourceStream.Read(buffer, 0, buffer.Length)) != 0) { destinationStream.Write(buffer, 0, numRead); } } private static byte[] CreateByteArrayFromStream(MemoryStream outStream) { byte[] byteArray = new byte[outStream.Length]; outStream.Position = 0; outStream.Read(byteArray, 0, (int)outStream.Length); return byteArray; }

Category:stream Time:2011-03-03 Views:1

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