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Science Forum Index » Compression Forum » Using zlib to unzip .ZIP files
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| Guest |
 Posted: Mon Apr 14, 2008 9:20 am |
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Can zlib be used to unzip .ZIP files? I tried using untgz_d.exe to
unzip test .ZIP file and get "broken archive" message. Same test file
can be unzipped with pkunzip.exe successfully. |
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| Mark Adler |
| Posted: Mon Apr 14, 2008 9:52 am |
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Guest
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On Apr 14, 12:20 pm, John_...@inbox.ru wrote:
Quote: Can zlib be used to unzip .ZIP files?
In general, yes, but you have to write your own code to parse the zip
file format (or you can use the contributed code in the zlib
distribution in the contrib/minizip directory). The zip format is
documented here: http://www.pkware.com/documents/casestudies/APPNOTE.TXT
The zip format allows several different compression methods. zlib
only provides support for the deflate method (also the deflate64
method, again in the contrib directory). So in theory, you would need
other decompressors to handle any zip file that might come your way.
However in practice, nearly all zip files use deflate exclusively, for
portability.
Mark |
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