Compress::Zlib Version 1.21 28 April 2003 Copyright (c) 1995-2003 Paul Marquess. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. DESCRIPTION ----------- This module provides a Perl interface to most of the zlib compression library. For more details see the pod documentation embedded in the file Zlib.pm. If you have downloaded this module in the expectation of manipulating the contents of .zip files, you will need to fetch and build the Archive::Zip module below once you have installed this one. http://www.cpan.org/modules/by-module/Archive/Archive-Zip-*.tar.gz PREREQUISITES ------------- Before you can build Compress::Zlib you need to have the following installed on your system: * A C compiler * Perl 5.004 or better. * The zlib compression library, version 1.0.2 or better NOTE that this module is NOT compatible with versions of zlib <= 1.0.1 The zlib compression library is available at http://www.gzip.org/zlib/ When building Compress::Zlib, you can optionally build the zlib library at the same time. If you are running Windows 95/98/NT, this seems to be the most straightforward option. If you don't have access to a C compiler see the Win32 Notes section. If you want Compress::Zlib to build zlib, fetch a copy of the zlib distribution from the site mentioned above and unpack it into the Compress::Zlib source directory. If you have fetched zlib 1.1.4, it will create a directory called zlib-1.1.4. Now, whether you are building zlib or not, edit the file config.in and follow the instructions given in it. BUILDING THE MODULE ------------------- Assuming you have met all the prerequisites, the module can now be built using this sequence of commands: Step 1 : Edit the file config.in to suit you local installation. Instructions are given in the file. Step 2 : Build and test the module using this sequence of commands: perl Makefile.PL make make test INSTALLATION ------------ To install Compress::Zlib, run the command below: make install UPDATES ------- The most recent version of Compress::Zlib is always available at http://www.cpan.org/modules/by-module/Compress/ TROUBLESHOOTING --------------- Undefined Symbol gzsetparams ---------------------------- If you get the error shown below when you run the Compress::Zlib test harness it probably means you are running a copy of zlib that is version 1.0.5 or older. t/01version.........Can't load 'blib/arch/auto/Compress/Zlib/Zlib.so' for module Compress::Zlib: blib/arch/auto/Compress/Zlib/Zlib.so: undefined symbol: gzsetparams at ... There are two ways to fix this problem: 1. Upgrade to the latest version of zlib. 2. Edit config.in and set the OLD_ZLIB variable to True. Test Harness 01version fails ---------------------------- If the 01version test harness fails, and the problem isn't covered by the scenario above, it probably means that you have two versions of zlib installed on your system. Run the command below to see if this is indeed the case make test TEST_VERBOSE=1 TEST_FILES=t/01version.t Try removing the one you don't want to use and rebuild. HP-UX Notes ----------- I've had a report that when building Compress::Zlib under HP-UX that it is necessary to have first built the zlib library with the -fpic option. Linux Notes ----------- Although most Linux distributions already come with zlib, some people report getting this error when they try to build this module: $ make cp Zlib.pm blib/lib/Compress/Zlib.pm AutoSplitting blib/lib/Compress/Zlib.pm (blib/lib/auto/Compress/Zlib) /usr/bin/perl -I/usr/lib/perl5/5.6.1/i386-linux -I/usr/lib/perl5/5.6.1 /usr/lib/perl5/5.6.1/ExtUtils/xsubpp -typemap /usr/lib/perl5/5.6.1/ExtUtils/typemap -typemap typemap Zlib.xs > Zlib.xsc && mv Zlib.xsc Zlib.c gcc -c -I/usr/local/include -fno-strict-aliasing -I/usr/local/include -O2 -march=i386 -mcpu=i686 -DVERSION=\"1.16\" -DXS_VERSION=\"1.16\" -fPIC -I/usr/lib/perl5/5.6.1/i386-linux/CORE Zlib.c Zlib.xs:25:19: zlib.h: No such file or directory make: *** [Zlib.o] Error 1 This usually means that you have not installed the development RPM for zlib. Check for an RPM that start with "zlib-devel" in your Linux distribution. Win32 Notes ----------- If you are running Activestate Perl (from http://www.activestate.com), it ships with a pre-compiled version of Compress::Zlib. To check if a newer version of Compress::Zlib is available run this from the command prompt C:\> ppm verify -upgrade Compress-Zlib If you are not running Activestate Perl and you don't have access to a C compiler, you will not be able to build and install this module. Win32 & Cygwin Notes -------------------- It is not possible to install Compress::Zlib using the CPAN shell. This is because the Compress::Zlib DLL is itself used by the CPAN shell and it is impossible to remove a DLL while it is already loaded under Windows. The workaround is to install Compress::Zlib manually using the instructions given at the start of this file. Mac OX X Notes -------------- Some versions of Mac OS X are failing a number of the tests in the 06gzdopen.t test harness. The functionality being exercised in these tests is checking that it is possible to call gzopen with an existing Perl filenhandle instead of a filename. For some reason it does not seem possible to extract a numeric file descriptor (using fileno) from a FILE* and then make use of it. If you happen to now how to fix for this, I would like to hear from you. In the meantime, a workaround that has been reported to me is to use fink, available at http://fink.sourceforge.net FEEDBACK -------- How to report a problem with Compress::Zlib. To help me help you, I need all of the following information: 1. The *complete* output from running this perl -V Do not edit the output in any way. Note, I want you to run "perl -V" and NOT "perl -v". If your perl does not understand the "-V" option it is too old. This module needs Perl version 5.004 or better. 2. The version of Compress::Zlib you have. If you have successfully installed Compress::Zlib, this one-liner will tell you: perl -MCompress::Zlib -e 'print "ver $Compress::Zlib::VERSION\n"' If you haven't installed Compress::Zlib then search Compress::Zlib.pm for a line like this: $VERSION = "1.05" ; 3. The version of zlib you have installed. If you have successfully installed Compress::Zlib, this one-liner will tell you: perl -MCompress::Zlib -e 'print "zlib ver ". Compress::Zlib::ZLIB_VERSION."\n"' If not, look at the beginning of the file zlib.h. 4. If you are having problems building Compress::Zlib, send me a complete log of what happened. Start by unpacking the Compress:Zlib module into a fresh directory and keep a log of all the steps [edit config.in, if necessary] perl Makefile.PL make make test TEST_VERBOSE=1 Paul Marquess