Kenneth Porter wrote: > Any idea why the zlib authors don't want to support it? Is it patented > or not-invented-here? (This is the first I've heard of deflate64.)
I didn't investigate zlib (Dave O'Neill did), and it seems that they had to reverse-engineer deflate64. Apparently, there were comments in the code that it was experimental, unsupported, and unlikely to be supported. >From the zlib FAQ: http://www.zlib.net/zlib_faq.html#faq39 39. Does zlib support the new "Deflate64" format introduced by PKWare? No. PKWare has apparently decided to keep that format proprietary, since they have not documented it as they have previous compression formats. In any case, the compression improvements are so modest compared to other more modern approaches, that it's not worth the effort to implement. Unfortunately, the latest version of Winzip appears to offer the "brand-new spanking cool honkin' nifty super-duper" compression option (which is deflate64). It pops up a warning that such ZIP files might not be widely compatible, but gives you the option of suppressing the warning in the future. Our customers are seeing steady trickles of these undigestible ZIP files. :-( Regards, David. _______________________________________________ Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
