.TH ZLIB 3 "18 July 2005"
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.TH ZLIB 3 "18 July 2005"
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.SH NAME
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.SH NAME
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zlib \- compression/decompression library
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zlib \- compression/decompression library
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.SH SYNOPSIS
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.SH SYNOPSIS
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[see
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[see
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.I zlib.h
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.I zlib.h
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for full description]
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for full description]
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.SH DESCRIPTION
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.SH DESCRIPTION
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The
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The
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.I zlib
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.I zlib
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library is a general purpose data compression library.
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library is a general purpose data compression library.
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The code is thread safe.
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The code is thread safe.
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It provides in-memory compression and decompression functions,
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It provides in-memory compression and decompression functions,
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including integrity checks of the uncompressed data.
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including integrity checks of the uncompressed data.
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This version of the library supports only one compression method (deflation)
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This version of the library supports only one compression method (deflation)
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but other algorithms will be added later
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but other algorithms will be added later
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and will have the same stream interface.
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and will have the same stream interface.
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.LP
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.LP
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Compression can be done in a single step if the buffers are large enough
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Compression can be done in a single step if the buffers are large enough
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(for example if an input file is mmap'ed),
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(for example if an input file is mmap'ed),
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or can be done by repeated calls of the compression function.
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or can be done by repeated calls of the compression function.
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In the latter case,
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In the latter case,
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the application must provide more input and/or consume the output
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the application must provide more input and/or consume the output
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(providing more output space) before each call.
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(providing more output space) before each call.
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.LP
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.LP
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The library also supports reading and writing files in
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The library also supports reading and writing files in
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.IR gzip (1)
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.IR gzip (1)
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(.gz) format
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(.gz) format
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with an interface similar to that of stdio.
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with an interface similar to that of stdio.
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.LP
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.LP
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The library does not install any signal handler.
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The library does not install any signal handler.
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The decoder checks the consistency of the compressed data,
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The decoder checks the consistency of the compressed data,
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so the library should never crash even in case of corrupted input.
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so the library should never crash even in case of corrupted input.
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.LP
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.LP
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All functions of the compression library are documented in the file
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All functions of the compression library are documented in the file
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.IR zlib.h .
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.IR zlib.h .
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The distribution source includes examples of use of the library
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The distribution source includes examples of use of the library
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in the files
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in the files
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.I example.c
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.I example.c
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and
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and
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.IR minigzip.c .
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.IR minigzip.c .
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.LP
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.LP
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Changes to this version are documented in the file
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Changes to this version are documented in the file
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.I ChangeLog
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.I ChangeLog
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that accompanies the source,
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that accompanies the source,
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and are concerned primarily with bug fixes and portability enhancements.
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and are concerned primarily with bug fixes and portability enhancements.
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.LP
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.LP
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A Java implementation of
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A Java implementation of
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.I zlib
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.I zlib
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is available in the Java Development Kit 1.1:
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is available in the Java Development Kit 1.1:
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.IP
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.IP
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http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
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http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
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.LP
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.LP
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A Perl interface to
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A Perl interface to
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.IR zlib ,
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.IR zlib ,
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written by Paul Marquess (pmqs@cpan.org),
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written by Paul Marquess (pmqs@cpan.org),
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is available at CPAN (Comprehensive Perl Archive Network) sites,
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is available at CPAN (Comprehensive Perl Archive Network) sites,
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including:
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including:
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.IP
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.IP
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http://www.cpan.org/modules/by-module/Compress/
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http://www.cpan.org/modules/by-module/Compress/
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.LP
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.LP
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A Python interface to
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A Python interface to
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.IR zlib ,
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.IR zlib ,
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written by A.M. Kuchling (amk@magnet.com),
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written by A.M. Kuchling (amk@magnet.com),
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is available in Python 1.5 and later versions:
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is available in Python 1.5 and later versions:
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.IP
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.IP
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http://www.python.org/doc/lib/module-zlib.html
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http://www.python.org/doc/lib/module-zlib.html
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.LP
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.LP
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A
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A
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.I zlib
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.I zlib
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binding for
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binding for
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.IR tcl (1),
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.IR tcl (1),
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written by Andreas Kupries (a.kupries@westend.com),
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written by Andreas Kupries (a.kupries@westend.com),
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is availlable at:
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is availlable at:
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.IP
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.IP
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http://www.westend.com/~kupries/doc/trf/man/man.html
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http://www.westend.com/~kupries/doc/trf/man/man.html
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.LP
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.LP
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An experimental package to read and write files in .zip format,
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An experimental package to read and write files in .zip format,
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written on top of
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written on top of
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.I zlib
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.I zlib
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by Gilles Vollant (info@winimage.com),
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by Gilles Vollant (info@winimage.com),
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is available at:
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is available at:
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.IP
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.IP
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http://www.winimage.com/zLibDll/unzip.html
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http://www.winimage.com/zLibDll/unzip.html
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and also in the
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and also in the
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.I contrib/minizip
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.I contrib/minizip
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directory of the main
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directory of the main
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.I zlib
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.I zlib
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web site.
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web site.
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.SH "SEE ALSO"
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.SH "SEE ALSO"
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The
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The
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.I zlib
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.I zlib
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web site can be found at either of these locations:
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web site can be found at either of these locations:
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.IP
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.IP
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http://www.zlib.org
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http://www.zlib.org
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.br
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.br
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http://www.gzip.org/zlib/
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http://www.gzip.org/zlib/
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.LP
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.LP
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The data format used by the zlib library is described by RFC
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The data format used by the zlib library is described by RFC
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(Request for Comments) 1950 to 1952 in the files:
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(Request for Comments) 1950 to 1952 in the files:
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.IP
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.IP
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http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)
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http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)
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.br
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.br
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http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)
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http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)
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.br
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.br
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http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)
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http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)
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.LP
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.LP
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These documents are also available in other formats from:
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These documents are also available in other formats from:
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.IP
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.IP
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ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
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ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
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.LP
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.LP
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Mark Nelson (markn@ieee.org) wrote an article about
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Mark Nelson (markn@ieee.org) wrote an article about
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.I zlib
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.I zlib
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for the Jan. 1997 issue of Dr. Dobb's Journal;
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for the Jan. 1997 issue of Dr. Dobb's Journal;
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a copy of the article is available at:
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a copy of the article is available at:
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.IP
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.IP
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http://dogma.net/markn/articles/zlibtool/zlibtool.htm
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http://dogma.net/markn/articles/zlibtool/zlibtool.htm
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.SH "REPORTING PROBLEMS"
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.SH "REPORTING PROBLEMS"
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Before reporting a problem,
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Before reporting a problem,
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please check the
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please check the
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.I zlib
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.I zlib
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web site to verify that you have the latest version of
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web site to verify that you have the latest version of
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.IR zlib ;
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.IR zlib ;
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otherwise,
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otherwise,
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obtain the latest version and see if the problem still exists.
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obtain the latest version and see if the problem still exists.
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Please read the
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Please read the
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.I zlib
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.I zlib
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FAQ at:
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FAQ at:
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.IP
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.IP
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http://www.gzip.org/zlib/zlib_faq.html
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http://www.gzip.org/zlib/zlib_faq.html
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.LP
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.LP
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before asking for help.
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before asking for help.
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Send questions and/or comments to zlib@gzip.org,
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Send questions and/or comments to zlib@gzip.org,
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or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
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or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
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.SH AUTHORS
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.SH AUTHORS
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Version 1.2.3
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Version 1.2.3
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Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org)
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Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org)
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and Mark Adler (madler@alumni.caltech.edu).
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and Mark Adler (madler@alumni.caltech.edu).
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.LP
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.LP
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This software is provided "as-is,"
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This software is provided "as-is,"
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without any express or implied warranty.
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without any express or implied warranty.
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In no event will the authors be held liable for any damages
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In no event will the authors be held liable for any damages
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arising from the use of this software.
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arising from the use of this software.
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See the distribution directory with respect to requirements
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See the distribution directory with respect to requirements
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governing redistribution.
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governing redistribution.
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The deflate format used by
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The deflate format used by
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.I zlib
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.I zlib
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was defined by Phil Katz.
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was defined by Phil Katz.
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The deflate and
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The deflate and
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.I zlib
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.I zlib
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specifications were written by L. Peter Deutsch.
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specifications were written by L. Peter Deutsch.
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Thanks to all the people who reported problems and suggested various
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Thanks to all the people who reported problems and suggested various
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improvements in
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improvements in
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.IR zlib ;
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.IR zlib ;
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who are too numerous to cite here.
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who are too numerous to cite here.
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.LP
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.LP
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UNIX manual page by R. P. C. Rodgers,
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UNIX manual page by R. P. C. Rodgers,
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U.S. National Library of Medicine (rodgers@nlm.nih.gov).
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U.S. National Library of Medicine (rodgers@nlm.nih.gov).
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.\" end of man page
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.\" end of man page
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