I don't know if WinZip will handle gzip files, but WinRAR certainly does.
You code looks ok, except that the "9" parameter should be passed to Gzip,
not FileSink.
----- Original Message -----
From: "Jeffrey Walton" <[EMAIL PROTECTED]>
To: "Crypto++" <[EMAIL PROTECTED]>
Sent: Sunday, May 27, 2007 3:13 PM
Subject: Embarassing Question: GZip
>
> Hi All,
>
> I hate asking this one, but I'm neck deep in a Memorial Day deadline...
>
> I compressed an image (generic term... not a picture) using Gzip as
> follows below. The archive is created, and image size is showming
> compression (1.5 MB -> 450 KB). When I attempt to view in WinZip, I
> receive the message, "Cannot open file: it does not appear to be a
> valid archive. If you downloaded this file, try downloading the file
> again."
>
> My question[s] is/are:
> 1) Does WinZip not handle a GZip properly?
> 2) If [1], what is a recommended external viewer to validate the
> results of the operation on a Win32 platform
> 3) Am I doing something wrong (most likely)
>
> Jeff
>
>
> try {
> CryptoPP::Gzip zipper(
> // Compression Speed: 1 = fast, 9 = slow
> new CryptoPP::FileSink ( filename.c_str(), 9 )
> );
> zipper.Put( (byte*)pCodeStart, dwCodeSize );
> zipper.MessageEnd( );
> }
>
> catch( CryptoPP::Exception& e )
> {
> std::cerr << e.what() << std:: endl;
> }
>
> catch( ... )
> {
> std::tcerr << _T("Caught Unknown Exception") << std:: endl;
> }
>
> >
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