io::compress::rawdeflate.3

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.\" ========================================================================
.\"
.IX Title "IO::Compress::RawDeflate 3"
.TH IO::Compress::RawDeflate 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"
IO::Compress::RawDeflate \- Write RFC 1951 files/buffers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&
\&
\&    my $status = rawdeflate $input => $output [,OPTS] 
\&        or die "rawdeflate failed: $RawDeflateError\en";
\&
\&    my $z = new IO::Compress::RawDeflate $output [,OPTS]
\&        or die "rawdeflate failed: $RawDeflateError\en";
\&
\&    $z\->print($string);
\&    $z\->printf($format, $string);
\&    $z\->write($string);
\&    $z\->syswrite($string [, $length, $offset]);
\&    $z\->flush();
\&    $z\->tell();
\&    $z\->eof();
\&    $z\->seek($position, $whence);
\&    $z\->binmode();
\&    $z\->fileno();
\&    $z\->opened();
\&    $z\->autoflush();
\&    $z\->input_line_number();
\&    $z\->newStream( [OPTS] );
\&    
\&    $z\->deflateParams();
\&    
\&    $z\->close() ;
\&
\&    $RawDeflateError ;
\&
\&    # IO::File mode
\&
\&    print $z $string;
\&    printf $z $format, $string;
\&    tell $z
\&    eof $z
\&    seek $z, $position, $whence
\&    binmode $z
\&    fileno $z
\&    close $z ;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides a Perl interface that allows writing compressed
data to files or buffer as defined in \s-1RFC\s0 1951.
.PP
Note that \s-1RFC\s0 1951 data is not a good choice of compression format
to use in isolation, especially if you want to auto-detect it.
.PP
For reading \s-1RFC\s0 1951 files/buffers, see the companion module 
IO::Uncompress::RawInflate.
.SH "Functional Interface"
.IX Header "Functional Interface"
A top-level function, \f(CW\*(C`rawdeflate\*(C'\fR, is provided to carry out
\&\*(L"one-shot\*(R" compression between buffers and/or files. For finer
control over the compression process, see the \*(L"\s-1OO\s0 Interface\*(R"
section.
.PP
.Vb 1
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&
\&    rawdeflate $input => $output [,OPTS] 
\&        or die "rawdeflate failed: $RawDeflateError\en";
.Ve
.PP
The functional interface needs Perl5.005 or better.
.ie n .Sh "rawdeflate $input\fP => \f(CW$output [, \s-1OPTS\s0]"
.el .Sh "rawdeflate \f(CW$input\fP => \f(CW$output\fP [, \s-1OPTS\s0]"
.IX Subsection "rawdeflate $input => $output [, OPTS]"
\&\f(CW\*(C`rawdeflate\*(C'\fR expects at least two parameters, \f(CW$input\fR and \f(CW$output\fR.
.PP
\fIThe \f(CI$input\fI parameter\fR
.IX Subsection "The $input parameter"
.PP
The parameter, \f(CW$input\fR, is used to define the source of
the uncompressed data.
.PP
It can take one of the following forms:
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$input\fR parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for reading and the input data
will be read from it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$input\fR parameter is a filehandle, the input data will be
read from it.
The string '\-' can be used as an alias for standard input.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$input\fR is a scalar reference, the input data will be read
from \f(CW$$input\fR.
.IP "An array reference" 5
.IX Item "An array reference"
If \f(CW$input\fR is an array reference, each element in the array must be a
filename.
.Sp
The input data will be read from each file in turn.
.Sp
The complete array will be walked to ensure that it only
contains valid filenames before any data is compressed.
.IP "An Input FileGlob string" 5
.IX Item "An Input FileGlob string"
If \f(CW$input\fR is a string that is delimited by the characters \*(L"<\*(R" and \*(L">\*(R"
\&\f(CW\*(C`rawdeflate\*(C'\fR will assume that it is an \fIinput fileglob string\fR. The
input is the list of files that match the fileglob.
.Sp
If the fileglob does not match any files ...
.Sp
See File::GlobMapper for more details.
.PP
If the \f(CW$input\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.PP
\fIThe \f(CI$output\fI parameter\fR
.IX Subsection "The $output parameter"
.PP
The parameter \f(CW$output\fR is used to control the destination of the
compressed data. This parameter can take one of these forms.
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$output\fR parameter is a simple scalar, it is assumed to be a
filename.  This file will be opened for writing and the compressed
data will be written to it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$output\fR parameter is a filehandle, the compressed data
will be written to it.
The string '\-' can be used as an alias for standard output.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$output\fR is a scalar reference, the compressed data will be
stored in \f(CW$$output\fR.
.IP "An Array Reference" 5
.IX Item "An Array Reference"
If \f(CW$output\fR is an array reference, the compressed data will be
pushed onto the array.
.IP "An Output FileGlob" 5
.IX Item "An Output FileGlob"
If \f(CW$output\fR is a string that is delimited by the characters \*(L"<\*(R" and \*(L">\*(R"
\&\f(CW\*(C`rawdeflate\*(C'\fR will assume that it is an \fIoutput fileglob string\fR. The
output is the list of files that match the fileglob.
.Sp
When \f(CW$output\fR is an fileglob string, \f(CW$input\fR must also be a fileglob
string. Anything else is an error.
.PP
If the \f(CW$output\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.Sh "Notes"
.IX Subsection "Notes"
When \f(CW$input\fR maps to multiple files/buffers and \f(CW$output\fR is a single
file/buffer the input files/buffers will be stored
in \f(CW$output\fR as a concatenated series of compressed data streams.
.Sh "Optional Parameters"
.IX Subsection "Optional Parameters"
Unless specified below, the optional parameters for \f(CW\*(C`rawdeflate\*(C'\fR,
\&\f(CW\*(C`OPTS\*(C'\fR, are the same as those used with the \s-1OO\s0 interface defined in the
\&\*(L"Constructor Options\*(R" section below.
.ie n .IP """AutoClose => 0|1""" 5
.el .IP "\f(CWAutoClose => 0|1\fR" 5
.IX Item "AutoClose => 0|1"
This option applies to any input or output data streams to 
\&\f(CW\*(C`rawdeflate\*(C'\fR that are filehandles.
.Sp
If \f(CW\*(C`AutoClose\*(C'\fR is specified, and the value is true, it will result in all
input and/or output filehandles being closed once \f(CW\*(C`rawdeflate\*(C'\fR has
completed.
.Sp
This parameter defaults to 0.
.ie n .IP """BinModeIn => 0|1""" 5
.el .IP "\f(CWBinModeIn => 0|1\fR" 5
.IX Item "BinModeIn => 0|1"
When reading from a file or filehandle, set \f(CW\*(C`binmode\*(C'\fR before reading.
.Sp
Defaults to 0.
.ie n .IP """Append => 0|1""" 5
.el .IP "\f(CWAppend => 0|1\fR" 5
.IX Item "Append => 0|1"
\&\s-1TODO\s0
.Sh "Examples"
.IX Subsection "Examples"
To read the contents of the file \f(CW\*(C`file1.txt\*(C'\fR and write the compressed
data to the file \f(CW\*(C`file1.txt.1951\*(C'\fR.
.PP
.Vb 3
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&
\&    my $input = "file1.txt";
\&    rawdeflate $input => "$input.1951"
\&        or die "rawdeflate failed: $RawDeflateError\en";
.Ve
.PP
To read from an existing Perl filehandle, \f(CW$input\fR, and write the
compressed data to a buffer, \f(CW$buffer\fR.
.PP
.Vb 4
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&    use IO::File ;
\&
\&    my $input = new IO::File "<file1.txt"
\&        or die "Cannot open \*(Aqfile1.txt\*(Aq: $!\en" ;
\&    my $buffer ;
\&    rawdeflate $input => \e$buffer 
\&        or die "rawdeflate failed: $RawDeflateError\en";
.Ve
.PP
To compress all files in the directory \*(L"/my/home\*(R" that match \*(L"*.txt\*(R"
and store the compressed data in the same directory
.PP
.Vb 3
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&
\&    rawdeflate \*(Aq</my/home/*.txt>\*(Aq => \*(Aq<*.1951>\*(Aq
\&        or die "rawdeflate failed: $RawDeflateError\en";
.Ve
.PP
and if you want to compress each file one at a time, this will do the trick
.PP
.Vb 3
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
\&
\&    for my $input ( glob "/my/home/*.txt" )
\&    {
\&        my $output = "$input.1951" ;
\&        rawdeflate $input => $output 
\&            or die "Error compressing \*(Aq$input\*(Aq: $RawDeflateError\en";
\&    }
.Ve
.SH "OO Interface"
.IX Header "OO Interface"
.Sh "Constructor"
.IX Subsection "Constructor"
The format of the constructor for \f(CW\*(C`IO::Compress::RawDeflate\*(C'\fR is shown below
.PP
.Vb 2
\&    my $z = new IO::Compress::RawDeflate $output [,OPTS]
\&        or die "IO::Compress::RawDeflate failed: $RawDeflateError\en";
.Ve
.PP
It returns an \f(CW\*(C`IO::Compress::RawDeflate\*(C'\fR object on success and undef on failure. 
The variable \f(CW$RawDeflateError\fR will contain an error message on failure.
.PP
If you are running Perl 5.005 or better the object, \f(CW$z\fR, returned from 
IO::Compress::RawDeflate can be used exactly like an IO::File filehandle. 
This means that all normal output file operations can be carried out 
with \f(CW$z\fR. 
For example, to write to a compressed file/buffer you can use either of 
these forms
.PP
.Vb 2
\&    $z\->print("hello world\en");
\&    print $z "hello world\en";
.Ve
.PP
The mandatory parameter \f(CW$output\fR is used to control the destination
of the compressed data. This parameter can take one of these forms.
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$output\fR parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for writing and the compressed data
will be written to it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$output\fR parameter is a filehandle, the compressed data will be
written to it.
The string '\-' can be used as an alias for standard output.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$output\fR is a scalar reference, the compressed data will be stored
in \f(CW$$output\fR.