Question

I have a simple code

byte[] buffer = Encoding.UTF8.GetBytes("abracadabra");
MemoryStream ms = new MemoryStream();
DeflateStream ds = new DeflateStream(ms, CompressionMode.Compress, false);
ms.Write(buffer, 0, buffer.Length);

DeflateStream ds2 = new DeflateStream(ms, CompressionMode.Decompress, false);
byte[]  buffer2 = new byte[ms.Length];
ds2.Read(buffer2, 0, (int)ms.Length);
Console.WriteLine(Encoding.UTF8.GetString(buffer2));

And when reading from ds2, i have the following:

Stacktrace:

at (wrapper managed-to-native)
System.IO.Compression.DeflateStream.ReadZStream
(intptr,intptr,int) <0x00004>

at (wrapper managed-to-native)
System.IO.Compression.DeflateStream.ReadZStream
(intptr,intptr,int) <0x00004>

at
System.IO.Compression.DeflateStream.ReadInternal
(byte[],int,int) [0x00031] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.6.3\mcs\class\System\System.IO.Compression\DeflateStream.cs:192

at
System.IO.Compression.DeflateStream.Read
(byte[],int,int) [0x00086] in
C:\cygwin\tmp\monobuild\build\BUILD\mono-2.6.3\mcs\class\System\System.IO.Compression\DeflateStream.cs:214

at testtesttest.MainClass.Main
(string[]) [0x00041] in
C:\Users\ilukyanov\Desktop\Cassini\GZipDemo\Main.cs:27

at (wrapper runtime-invoke)
.runtime_invoke_void_object
(object,intptr,intptr,intptr)

This application has requested the
Runtime to terminate it in an unusual
way. Please contact the application’s
support team for more information.

This problem appears in Mono 2.6.1 & 2.6.3…

Is there any known way to successfully read from DeflateStream in Mono? Or maybe there are some third-party open-source assemblies with the same functionality?

Answer 1

You can call zlib natively using Interop with DllImport.
Only trick is to use the right size in the structures and to include the shared library in the LD_LIBRARY_PATH, if you are on a Unix platform.