Zlib decompression - Any ideas?
briany at qldlearning.com
Mon Dec 29 19:09:22 EST 2008
Unfortunately it sounds like you are dealing with a Windows "zip"
archive which is different from a "gzip" encoded archive. See this
post for a nutshell explanation:
In short, they are related but not interoperable. You will probably
have to tap into an actual "zip" library if these files have been
compressed using a different algorithm than gzip.
With that said, there should be command-line "zip" utilities for every
OS, so you might still be able to include those and use shell() calls.
>> Can you compress a copy of the original file with Rev, and compare it
>> to the zlib compressed copy? Does the data look totally different, or
>> maybe just off by a few bytes / headers?
> Unfortunately, I don't have the original file... the files I'm
> receiving are
> from another program on Windows that only decompresses the data in
> the files on disk are always in a compressed state, so the files I
> can look
> at are always compressed.
>> If you have a MacOS X machine (or Linux) handy, you can use gzip and
>> gunzip as command-line equivalents of compress() and decompress() and
>> see how those results compare as well...
> Yeah, I've tried that already and keep getting errors that the data
> is "not
> Ken Ray
> Sons of Thunder Software, Inc.
> Email: kray at sonsothunder.com
> Web Site: http://www.sonsothunder.com/
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