[Mono-dev] Status of System.IO.Compression (both Deflate and Gzip)

[Miguel de Icaza]

Hello folks,

    Please file a bug report.

> Hi,
> 
> I noticed the same problem.  There seem to be a problem when reading more
> than once the same compressed stream.  If possible, try reading everything
> in one call (you need to know the actual size of the stream once
> decompressed).  This works for me.
> 
> -----Message d'origine-----
> De : mono-devel-list-bounces at lists.ximian.com
> [mailto:mono-devel-list-bounces at lists.ximian.com] De la part de David
> Wolinsky
> Envoyé : Monday, July 23, 2007 4:14 PM
> À : mono-devel
> Objet : [Mono-dev] Status of System.IO.Compression (both Deflate and Gzip)
> 
> I am not having luck with either class using 1.2.4, they both compile but
> the results never come out right... perhaps they aren't fully implemented
> yet?
> 
> Here's what I'm using...
> 
> using System;
> using System.IO.Compression;
> using System.IO;
> using System.Security.Cryptography;
> 
> namespace poop {
>   public class poopie {
>     public static void Main() {
>       byte [] data = new byte[100000];
>       for (int i = 0; i < 100000; i++) {
>         data[i] = (byte) i;
>       }
>       MemoryStream dataStream = new MemoryStream (data);
>       MemoryStream backing = new MemoryStream ();
>       GZipStream compressing = new GZipStream (backing,
> CompressionMode.Compress, true);
>       CopyStream (dataStream, compressing);
>       dataStream.Close();
> // This next method causes an exception and if uncommented still it doesn't
> work right...
>       compressing.Close();
>       backing.Seek (0, SeekOrigin.Begin);
>       GZipStream decompressing = new GZipStream (backing,
> CompressionMode.Decompress);
>       MemoryStream output = new MemoryStream ();
>       CopyStream (decompressing, output);
>       Console.WriteLine(backing.Length);
>       for (int i = 0; i < backing.Length; i++) {
>         Console.WriteLine(backing.GetBuffer()[i]);
>       }
>       Console.WriteLine(compare_buffers (data, output.GetBuffer(), (int)
> data.Length));
>       decompressing.Close();
>       output.Close();
>     }
> 
>     private static void CopyStream (Stream src, Stream dest)
>     {
>       byte[] array = new byte[1024];
>       int bytes_read;
>       bytes_read = src.Read (array, 0, 1024);
>       while (bytes_read != 0) {
>         dest.Write (array, 0, bytes_read);
>         bytes_read = src.Read (array, 0, 1024);
>       }
>     }
> 
>     private static bool compare_buffers (byte[] first, byte[] second, int
> length)
>     {
>       if (first.Length < length || second.Length < length) {
>         return false;
>       }
>       for (int i = 0; i < length; i++) {
>         if (first[i] != second[i]) {
>           return false;
>         }
>       }
>       return true;
>     }
>   }
> }
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