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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.cdrom.com/pub/infozip/zlib/ which may have more recent information. |
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| 7 | |
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| 8 | |
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| 9 | 1) I need a Windows DLL |
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| 10 | 2) I need a Visual Basic interface to zlib |
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| 11 | 3) compress() returns Z_BUF_ERROR |
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| 12 | 4) deflate or inflate returns Z_BUF_ERROR |
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| 13 | 5) Where is the zlib documentation (man pages, etc...)? |
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| 14 | 6) Why don't you use GNU autoconf, libtool, etc...? |
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| 15 | 7) There is a bug in zlib. |
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| 16 | 8) I get "undefined reference to gzputc" |
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| 17 | |
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| 18 | |
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| 19 | |
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| 20 | 1) I need a Windows DLL |
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| 21 | |
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| 22 | The zlib sources can be compiled without change to produce a DLL. |
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| 23 | If you want a precompiled DLL, see http://www.winimage.com/zLibDll |
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| 24 | |
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| 25 | |
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| 26 | 2) I need a Visual Basic interface to zlib |
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| 27 | |
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| 28 | See http://www.tcfb.com/dowseware/cmp-z-it.zip |
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| 29 | http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm |
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| 30 | and contrib/visual-basic.txt |
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| 31 | |
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| 32 | 3) compress() returns Z_BUF_ERROR |
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| 33 | |
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| 34 | Make sure that before the call of compress, the length of the |
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| 35 | compressed buffer is equal to the total size of the compressed buffer |
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| 36 | and not zero. For Visual Basic, check that this parameter is passed |
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| 37 | by reference ("as any"), not by value ("as long"). |
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| 38 | |
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| 39 | |
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| 40 | 4) deflate or inflate returns Z_BUF_ERROR |
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| 41 | |
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| 42 | Make sure that before the call avail_in and avail_out are not zero. |
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| 43 | |
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| 44 | |
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| 45 | 5) Where is the zlib documentation (man pages, etc...)? |
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| 46 | |
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| 47 | It's in zlib.h for the moment. Volunteers to transform this |
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| 48 | to man pages, please contact jloup@gzip.org. Examples of zlib usage |
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| 49 | are in the files example.c and minigzip.c. |
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| 50 | |
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| 51 | |
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| 52 | 6) Why don't you use GNU autoconf, libtool, etc...? |
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| 53 | |
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| 54 | Because we would like to keep zlib as a very small and simple package. |
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| 55 | zlib is rather portable and doesn't need much configuration. |
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| 56 | |
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| 57 | |
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| 58 | 7) There is a bug in zlib. |
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| 59 | |
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| 60 | Most of the time, such problems are due to an incorrect usage |
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| 61 | of zlib. Please try to reproduce the problem with a small |
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| 62 | program and send us the corresponding source at zlib@quest.jpl.nasa.gov |
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| 63 | Do not send multi-megabyte data files without prior agreement. |
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| 64 | |
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| 65 | |
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| 66 | 8) I get "undefined reference to gzputc" |
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| 67 | |
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| 68 | If "make test" produces something like |
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| 69 | example.o(.text+0x174): |
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| 70 | check that you don't have old files libz.* in /usr/lib, /usr/local/lib |
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| 71 | or /usr/X11R6/lib. Remove old versions then do "make install". |
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| 72 | |
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