GZip Version Problems

Question

Hello Everyone,
I have the need to decompress an array of bytes that are given to me in gzip format. The problem that I am facing is that I beleive that the version of gzip that the bytes are compressed with, is different than the version of gzip that is built into the java API. Every time I try to unzip the bytes using GZIPInputStream, I get the error "Not in gzip format." Is there any way I can decompress gzip files compressed with an older version of gzip? Does anyone know the version of Gzip java uses?
Thanks for all the help
- Jon
Here is my decompress code:
static byte[] Decompress(byte[] buffer) throws IOException
          ByteArrayInputStream bin = new ByteArrayInputStream(buffer);
          GZIPInputStream zip = null;
          try
               zip = new GZIPInputStream(bin);
               ByteArrayOutputStream bout = new ByteArrayOutputStream();
               while(true)
                    int b = zip.read();
                    if(b == -1)
                         break;
                    bout.write(b);
               return bout.toByteArray();
          finally
               if (zip != null)
                    zip.close();
     }

Answer 1

Jpmon1 wrote:
It is a gzip file, we use a C++ gzip library to compress it. The version of the gzip library in C++ is 1.1. We can decompress it fine through the C++ library.Can't really diagnose the problem if you can't post standalone code. Put your gzip file into a hard-coded byte[] and post that and code that demonstrates the problem.
EDIT: Also, are you aware there is a difference between gzip the file format, and the underlying compression mechanism (DEFLATE)?
Edited by: paul.miner on Jan 30, 2008 10:26 AM