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FAQ
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Frequently Asked Questions about zlib
If your question is not there, please check the zlib home page
http://www.cdrom.com/pub/infozip/zlib/ which may have more recent information.
1) I need a Windows DLL
2) I need a Visual Basic interface to zlib
3) compress() returns Z_BUF_ERROR
4) deflate or inflate returns Z_BUF_ERROR
5) Where is the zlib documentation (man pages, etc...)?
6) Why don't you use GNU autoconf, libtool, etc...?
7) There is a bug in zlib.
8) I get "undefined reference to gzputc"
1) I need a Windows DLL
The zlib sources can be compiled without change to produce a DLL.
If you want a precompiled DLL, see http://www.winimage.com/zLibDll
2) I need a Visual Basic interface to zlib
See http://www.tcfb.com/dowseware/cmp-z-it.zip
http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
and contrib/visual-basic.txt
3) compress() returns Z_BUF_ERROR
Make sure that before the call of compress, the length of the
compressed buffer is equal to the total size of the compressed buffer
and not zero. For Visual Basic, check that this parameter is passed
by reference ("as any"), not by value ("as long").
4) deflate or inflate returns Z_BUF_ERROR
Make sure that before the call avail_in and avail_out are not zero.
5) Where is the zlib documentation (man pages, etc...)?
It's in zlib.h for the moment. Volunteers to transform this
to man pages, please contact jloup@gzip.org. Examples of zlib usage
are in the files example.c and minigzip.c.
6) Why don't you use GNU autoconf, libtool, etc...?
Because we would like to keep zlib as a very small and simple package.
zlib is rather portable and doesn't need much configuration.
7) There is a bug in zlib.
Most of the time, such problems are due to an incorrect usage
of zlib. Please try to reproduce the problem with a small
program and send us the corresponding source at zlib@quest.jpl.nasa.gov
Do not send multi-megabyte data files without prior agreement.
8) I get "undefined reference to gzputc"
If "make test" produces something like
example.o(.text+0x174):
check that you don't have old files libz.* in /usr/lib, /usr/local/lib
or /usr/X11R6/lib. Remove old versions then do "make install".