Compress and decompress data using GZip

Hello

I compress and decompress data on Blackberry 8100 device using the GZip algorithm.

I use following code:

try {           GZIPOutputStream gCompress = null;          try {               ByteArrayOutputStream compressByte = new ByteArrayOutputStream();               gCompress = new GZIPOutputStream(compressByte,9);               gCompress.write(inputstring.getBytes());                                                //gCompress.flush();                compressedBytes = compressByte.toByteArray();               System.out.println("compressedBytes : "                     + new String(compressedBytes));             compressedString = new String(compressedBytes);                         } catch (IOException ex) {              ex.printStackTrace();           }       } catch (Exception e) {         e.printStackTrace();        }

The server is unable to decompress data.

Help, please.

Thank you very much.

I think you do a byte to the conversion of the string which you should not do and which may be screwing up your data. The output of compression is not likely to be easily represented by Unicode characters and you want to transmit the bytes, so I think that is not necessary.

This is a reformulated version of the sample in the API, which seems inaccurate, in any case: give it a try and remember that you can send the bytes, not characters.

public static byte[] compress( byte[] data ) {
    try {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        GZIPOutputStream gzipStream = new GZIPOutputStream( baos,
                                                            GZIPOutputStream.COMPRESSION_BEST,
                                                            GZIPOutputStream.MAX_LOG2_WINDOW_LENGTH );
        gzipStream.write( data );
        gzipStream.close();
        return baos.toByteArray();
    }
    catch(IOException ioe) {
        return null;
    }
}

Tags: BlackBerry Developers

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