compress::raw::zlib.3

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.\" ========================================================================
.\"
.IX Title "Compress::Raw::Zlib 3"
.TH Compress::Raw::Zlib 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Compress::Raw::Zlib \- Low\-Level Interface to zlib compression library
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Compress::Raw::Zlib ;
\&
\&    ($d, $status) = new Compress::Raw::Zlib::Deflate( [OPT] ) ;
\&    $status = $d\->deflate($input, $output) ;
\&    $status = $d\->flush($output [, $flush_type]) ;
\&    $d\->deflateParams(OPTS) ;
\&    $d\->deflateTune(OPTS) ;
\&    $d\->dict_adler() ;
\&    $d\->crc32() ;
\&    $d\->adler32() ;
\&    $d\->total_in() ;
\&    $d\->total_out() ;
\&    $d\->msg() ;
\&    $d\->get_Strategy();
\&    $d\->get_Level();
\&    $d\->get_BufSize();
\&
\&    ($i, $status) = new Compress::Raw::Zlib::Inflate( [OPT] ) ;
\&    $status = $i\->inflate($input, $output [, $eof]) ;
\&    $status = $i\->inflateSync($input) ;
\&    $i\->dict_adler() ;
\&    $d\->crc32() ;
\&    $d\->adler32() ;
\&    $i\->total_in() ;
\&    $i\->total_out() ;
\&    $i\->msg() ;
\&    $d\->get_BufSize();
\&
\&    $crc = adler32($buffer [,$crc]) ;
\&    $crc = crc32($buffer [,$crc]) ;
\&
\&    $crc = adler32_combine($crc1, $crc2, $len2)l
\&    $crc = crc32_combine($adler1, $adler2, $len2)
\&
\&    ZLIB_VERSION
\&    ZLIB_VERNUM
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fICompress::Raw::Zlib\fR module provides a Perl interface to the \fIzlib\fR
compression library (see \*(L"\s-1AUTHOR\s0\*(R" for details about where to get
\&\fIzlib\fR).
.SH "Compress::Raw::Zlib::Deflate"
.IX Header "Compress::Raw::Zlib::Deflate"
This section defines an interface that allows in-memory compression using
the \fIdeflate\fR interface provided by zlib.
.PP
Here is a definition of the interface available:
.ie n .Sh "\fB($d, \fP\fB$status\fP\fB) = new Compress::Raw::Zlib::Deflate( [\s-1OPT\s0] ) \fP"
.el .Sh "\fB($d, \fP\f(CB$status\fP\fB) = new Compress::Raw::Zlib::Deflate( [\s-1OPT\s0] ) \fP"
.IX Subsection "($d, $status) = new Compress::Raw::Zlib::Deflate( [OPT] ) "
Initialises a deflation object.
.PP
If you are familiar with the \fIzlib\fR library, it combines the
features of the \fIzlib\fR functions \f(CW\*(C`deflateInit\*(C'\fR, \f(CW\*(C`deflateInit2\*(C'\fR
and \f(CW\*(C`deflateSetDictionary\*(C'\fR.
.PP
If successful, it will return the initialised deflation object, \f(CW$d\fR
and a \f(CW$status\fR of \f(CW\*(C`Z_OK\*(C'\fR in a list context. In scalar context it
returns the deflation object, \f(CW$d\fR, only.
.PP
If not successful, the returned deflation object, \f(CW$d\fR, will be
\&\fIundef\fR and \f(CW$status\fR will hold the a \fIzlib\fR error code.
.PP
The function optionally takes a number of named options specified as
\&\f(CW\*(C`Name => value\*(C'\fR pairs. This allows individual options to be
tailored without having to specify them all in the parameter list.
.PP
For backward compatibility, it is also possible to pass the parameters
as a reference to a hash containing the name=>value pairs.
.PP
Below is a list of the valid options:
.IP "\fB\-Level\fR" 5
.IX Item "-Level"
Defines the compression level. Valid values are 0 through 9,
\&\f(CW\*(C`Z_NO_COMPRESSION\*(C'\fR, \f(CW\*(C`Z_BEST_SPEED\*(C'\fR, \f(CW\*(C`Z_BEST_COMPRESSION\*(C'\fR, and
\&\f(CW\*(C`Z_DEFAULT_COMPRESSION\*(C'\fR.
.Sp
The default is Z_DEFAULT_COMPRESSION.
.IP "\fB\-Method\fR" 5
.IX Item "-Method"
Defines the compression method. The only valid value at present (and
the default) is Z_DEFLATED.
.IP "\fB\-WindowBits\fR" 5
.IX Item "-WindowBits"
For a definition of the meaning and valid values for \f(CW\*(C`WindowBits\*(C'\fR
refer to the \fIzlib\fR documentation for \fIdeflateInit2\fR.
.Sp
Defaults to \s-1MAX_WBITS\s0.
.IP "\fB\-MemLevel\fR" 5
.IX Item "-MemLevel"
For a definition of the meaning and valid values for \f(CW\*(C`MemLevel\*(C'\fR
refer to the \fIzlib\fR documentation for \fIdeflateInit2\fR.
.Sp
Defaults to \s-1MAX_MEM_LEVEL\s0.
.IP "\fB\-Strategy\fR" 5
.IX Item "-Strategy"
Defines the strategy used to tune the compression. The valid values are
\&\f(CW\*(C`Z_DEFAULT_STRATEGY\*(C'\fR, \f(CW\*(C`Z_FILTERED\*(C'\fR, \f(CW\*(C`Z_RLE\*(C'\fR, \f(CW\*(C`Z_FIXED\*(C'\fR and
\&\f(CW\*(C`Z_HUFFMAN_ONLY\*(C'\fR.
.Sp
The default is Z_DEFAULT_STRATEGY.
.IP "\fB\-Dictionary\fR" 5
.IX Item "-Dictionary"
When a dictionary is specified \fICompress::Raw::Zlib\fR will automatically
call \f(CW\*(C`deflateSetDictionary\*(C'\fR directly after calling \f(CW\*(C`deflateInit\*(C'\fR. The
Adler32 value for the dictionary can be obtained by calling the method