| 1 |
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| 2 | Frequently Asked Questions about zlib
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| 3 |
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| 4 |
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| 5 | If your question is not there, please check the zlib home page
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| 6 | http://www.zlib.org which may have more recent information.
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| 7 | The lastest zlib FAQ is at http://www.gzip.org/zlib/zlib_faq.html
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| 8 |
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| 9 |
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| 10 | 1. Is zlib Y2K-compliant?
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| 11 |
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| 12 | Yes. zlib doesn't handle dates.
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| 13 |
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| 14 | 2. Where can I get a Windows DLL version?
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| 15 |
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| 16 | The zlib sources can be compiled without change to produce a DLL. If you
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| 17 | want a precompiled DLL, see http://www.winimage.com/zLibDll/ . Questions
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| 18 | about the zlib DLL should be sent to Gilles Vollant (info@winimage.com).
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| 19 |
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| 20 | 3. Where can I get a Visual Basic interface to zlib?
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| 21 |
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| 22 | See
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| 23 | * http://www.winimage.com/zLibDll/cmp-z-it.zip
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| 24 | * http://www.dogma.net/markn/articles/zlibtool/zlibtool.htm
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| 25 | * contrib/visual-basic.txt in the zlib distribution
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| 26 |
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| 27 | 4. compress() returns Z_BUF_ERROR
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| 28 |
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| 29 | Make sure that before the call of compress, the length of the compressed
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| 30 | buffer is equal to the total size of the compressed buffer and not
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| 31 | zero. For Visual Basic, check that this parameter is passed by reference
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| 32 | ("as any"), not by value ("as long").
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| 33 |
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| 34 | 5. deflate() or inflate() returns Z_BUF_ERROR
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| 35 |
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| 36 | Before making the call, make sure that avail_in and avail_out are not
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| 37 | zero. When setting the parameter flush equal to Z_FINISH, also make sure
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| 38 | that avail_out is big enough to allow processing all pending input.
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| 39 |
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| 40 | 6. Where's the zlib documentation (man pages, etc.)?
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| 41 |
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| 42 | It's in zlib.h for the moment, and Francis S. Lin has converted it to a
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| 43 | web page zlib.html. Volunteers to transform this to Unix-style man pages,
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| 44 | please contact Jean-loup Gailly (jloup@gzip.org). Examples of zlib usage
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| 45 | are in the files example.c and minigzip.c.
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| 46 |
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| 47 | 7. Why don't you use GNU autoconf or libtool or ...?
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| 48 |
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| 49 | Because we would like to keep zlib as a very small and simple
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| 50 | package. zlib is rather portable and doesn't need much configuration.
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| 51 |
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| 52 | 8. I found a bug in zlib.
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| 53 |
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| 54 | Most of the time, such problems are due to an incorrect usage of
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| 55 | zlib. Please try to reproduce the problem with a small program and send
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| 56 | the corresponding source to us at zlib@gzip.org . Do not send
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| 57 | multi-megabyte data files without prior agreement.
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| 58 |
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| 59 | 9. Why do I get "undefined reference to gzputc"?
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| 60 |
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| 61 | If "make test" produces something like
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| 62 |
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| 63 | example.o(.text+0x154): undefined reference to `gzputc'
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| 64 |
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| 65 | check that you don't have old files libz.* in /usr/lib, /usr/local/lib or
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| 66 | /usr/X11R6/lib. Remove any old versions, then do "make install".
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| 67 |
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| 68 | 10. I need a Delphi interface to zlib.
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| 69 |
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| 70 | See the directories contrib/delphi and contrib/delphi2 in the zlib
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| 71 | distribution.
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| 72 |
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| 73 | 11. Can zlib handle .zip archives?
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| 74 |
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| 75 | See the directory contrib/minizip in the zlib distribution.
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| 76 |
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| 77 | 12. Can zlib handle .Z files?
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| 78 |
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| 79 | No, sorry. You have to spawn an uncompress or gunzip subprocess, or adapt
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| 80 | the code of uncompress on your own.
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| 81 |
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| 82 | 13. How can I make a Unix shared library?
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| 83 |
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| 84 | make clean
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| 85 | ./configure -s
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| 86 | make
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| 87 |
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| 88 | 14. Why does "make test" fail on Mac OS X?
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| 89 |
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| 90 | Mac OS X already includes zlib as a shared library, and so -lz links the
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| 91 | shared library instead of the one that the "make" compiled. For zlib
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| 92 | 1.1.3, the two are incompatible due to different compile-time
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| 93 | options. Simply change the -lz in the Makefile to libz.a, and it will use
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| 94 | the compiled library instead of the shared one and the "make test" will
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| 95 | succeed.
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| 96 |
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| 97 | 15. I have a question about OttoPDF
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| 98 |
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| 99 | We are not the authors of OttoPDF. The real author is on the OttoPDF web
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| 100 | site Joel Hainley jhainley@myndkryme.com.
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