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IO-Compress
Version 2.217
1 Feb 2026
Copyright (c) 1995-2026 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 distribution provides a Perl interface to allow reading and writing of
compressed data created with the zlib and bzip2.
IO-Compress supports reading and writing of the following compressed data formats
* bzip2
* RFC 1950
* RFC 1951
* RFC 1952 (i.e. gzip)
* zip
There are a number of companion modules for IO-Compress that extend
the suite of compression formats available.
* IO-Compress-Zstd
Adds support for zstd (Zstandard).
* IO-Compress-Lzma
Adds support for lzma, xz and lzip.
* IO-Compress-Lzf
Adds support for lzf.
* IO-Compress-Lzop
Adds support for lzop.
Note that the following modules used to be distributed separately, but are now
included with the IO-Compress distribution.
Compress-Zlib
IO-Compress-Zlib
IO-Compress-Bzip2
IO-Compress-Base
PREREQUISITES
-------------
Before you can build IO-Compress you need to have the following
installed on your system:
* Perl 5.006 or better.
* Compress::Raw::Zlib
* Compress::Raw::Bzip2
BUILDING THE MODULE
-------------------
Assuming you have met all the prerequisites, the module can now be built
using this sequence of commands:
perl Makefile.PL
make
make test
INSTALLATION
------------
To install IO-Compress, run the command below:
make install
TROUBLESHOOTING
---------------
SUPPORT
-------
General feedback/questions/bug reports should be sent to
https://github.com/pmqs/IO-Compress/issues
FEEDBACK
--------
How to report a problem with IO-Compress.
To help me help you, I need all of the following information:
1. The Versions of everything relevant.
This includes:
a. 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.
b. The version of IO-Compress you have.
If you have successfully installed IO-Compress, this one-liner
will tell you:
perl -MIO::Compress::Gzip -e 'print qq[ver $IO::Compress::Gzip::VERSION\n]'
If you are running windows use this
perl -MIO::Compress::Gzip -e "print qq[ver $IO::Compress::Gzip::VERSION\n]"
If you haven't installed IO-Compress then search IO::Compress::Gzip.pm
for a line like this:
$VERSION = "2.217" ;
2. If you are having problems building IO-Compress, send me a
complete log of what happened. Start by unpacking the IO-Compress
module into a fresh directory and keep a log of all the steps, including
the setting of configuration environment variables (if applicable).
[edit config.in or set environment varialbes, if necessary]
perl Makefile.PL
make
make test TEST_VERBOSE=1
Paul Marquess <pmqs@cpan.org>
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