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.\" ========================================================================
.\"
.IX Title "IO::Compress::Bzip2 3pm"
.TH IO::Compress::Bzip2 3pm "2017-03-22" "perl v5.10.1" "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::Bzip2 \- Write bzip2 files/buffers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
\&
\&    my $status = bzip2 $input => $output [,OPTS] 
\&        or die "bzip2 failed: $Bzip2Error\en";
\&
\&    my $z = new IO::Compress::Bzip2 $output [,OPTS]
\&        or die "bzip2 failed: $Bzip2Error\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\->close() ;
\&
\&    $Bzip2Error ;
\&
\&    # 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 bzip2 
compressed data to files or buffer.
.PP
For reading bzip2 files/buffers, see the companion module 
IO::Uncompress::Bunzip2.
.SH "Functional Interface"
.IX Header "Functional Interface"
A top-level function, \f(CW\*(C`bzip2\*(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::Bzip2 qw(bzip2 $Bzip2Error) ;
\&
\&    bzip2 $input => $output [,OPTS] 
\&        or die "bzip2 failed: $Bzip2Error\en";
.Ve
.PP
The functional interface needs Perl5.005 or better.
.ie n .SS "bzip2 $input => $output [, \s-1OPTS\s0]"
.el .SS "bzip2 \f(CW$input\fP => \f(CW$output\fP [, \s-1OPTS\s0]"
.IX Subsection "bzip2 $input => $output [, OPTS]"
\&\f(CW\*(C`bzip2\*(C'\fR expects at least two parameters, \f(CW$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$$input\fR.
.IP "An array reference" 5
.IX Item "An array reference"
If \f(CW$input\fR is an array reference, each element in the array must be a
filename.
.Sp
The input data will be read from each file in turn.
.Sp
The complete array will be walked to ensure that it only
contains valid filenames before any data is compressed.
.IP "An Input FileGlob string" 5
.IX Item "An Input FileGlob string"
If \f(CW$input\fR is a string that is delimited by the characters \*(L"<\*(R" and \*(L">\*(R"
\&\f(CW\*(C`bzip2\*(C'\fR will assume that it is an \fIinput fileglob string\fR. The
input is the list of files that match the fileglob.
.Sp
If the fileglob does not match any files ...
.Sp
See File::GlobMapper for more details.
.PP
If the \f(CW$input\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.PP
\fIThe \f(CI$output\fI parameter\fR
.IX Subsection "The $output parameter"
.PP
The parameter \f(CW$output\fR is used to control the destination of the
compressed data. This parameter can take one of these forms.
.IP "A filename" 5
.IX Item "A filename"
If the \f(CW$output\fR parameter is a simple scalar, it is assumed to be a
filename.  This file will be opened for writing and the compressed
data will be written to it.
.IP "A filehandle" 5
.IX Item "A filehandle"
If the \f(CW$output\fR parameter is a filehandle, the compressed data
will be written to it.
The string '\-' can be used as an alias for standard output.
.IP "A scalar reference" 5
.IX Item "A scalar reference"
If \f(CW$output\fR is a scalar reference, the compressed data will be
stored in \f(CW$$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`bzip2\*(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$output\fR parameter is any other type, \f(CW\*(C`undef\*(C'\fR will be returned.
.SS "Notes"
.IX Subsection "Notes"
When \f(CW$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.
.SS "Optional Parameters"
.IX Subsection "Optional Parameters"
Unless specified below, the optional parameters for \f(CW\*(C`bzip2\*(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`bzip2\*(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`bzip2\*(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
.SS "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.bz2\*(C'\fR.
.PP
.Vb 3
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
\&
\&    my $input = "file1.txt";
\&    bzip2 $input => "$input.bz2"
\&        or die "bzip2 failed: $Bzip2Error\en";
.Ve
.PP
To read from an existing Perl filehandle, \f(CW$input\fR, and write the
compressed data to a buffer, \f(CW$buffer\fR.
.PP
.Vb 4
\&    use strict ;
\&    use warnings ;
\&    use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
\&    use IO::File ;
\&
\&    my $input = new IO::File "<file1.txt"
\&        or die "Cannot open \*(Aqfile1.txt\*(Aq: $!\en" ;
\&    my $buffer ;
\&    bzip2 $input => \e$buffer 
\&        or die "bzip2 failed: $Bzip2Error\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::Bzip2 qw(bzip2 $Bzip2Error) ;
\&
\&    bzip2 \*(Aq</my/home/*.txt>\*(Aq => \*(Aq<*.bz2>\*(Aq
\&        or die "bzip2 failed: $Bzip2Error\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::Bzip2 qw(bzip2 $Bzip2Error) ;
\&
\&    for my $input ( glob "/my/home/*.txt" )
\&    {
\&        my $output = "$input.bz2" ;
\&        bzip2 $input => $output 
\&            or die "Error compressing \*(Aq$input\*(Aq: $Bzip2Error\en";
\&    }
.Ve
.SH "OO Interface"
.IX Header "OO Interface"
.SS "Constructor"
.IX Subsection "Constructor"
The format of the constructor for \f(CW\*(C`IO::Compress::Bzip2\*(C'\fR is shown below
.PP
.Vb 2
\&    my $z = new IO::Compress::Bzip2 $output [,OPTS]
\&        or die "IO::Compress::Bzip2 failed: $Bzip2Error\en";
.Ve
.PP
It returns an \f(CW\*(C`IO::Compress::Bzip2\*(C'\fR object on success and undef on failure. 
The variable \f(CW$Bzip2Error\fR will contain an error message on failure.
.PP
If you are running Perl 5.005 or better the object, \f(CW$z\fR, returned from 
IO::Compress::Bzip2 can be used exactly like an IO::File filehandle. 
This means that all normal output file operations can be carried out 
with \f(CW$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.
.PP
If the \f(CW$output\fR parameter is any other type, \f(CW\*(C`IO::Compress::Bzip2\*(C'\fR::new will
return undef.
.SS "Constructor Options"
.IX Subsection "Constructor Options"
\&\f(CW\*(C`OPTS\*(C'\fR is any combination of the following options:
.ie n .IP """AutoClose => 0|1""" 5
.el .IP "\f(CWAutoClose => 0|1\fR" 5
.IX Item "AutoClose => 0|1"
This option is only valid when the \f(CW$output\fR parameter is a filehandle. If
specified, and the value is true, it will result in the \f(CW$output\fR being
closed once either the \f(CW\*(C`close\*(C'\fR method is called or the \f(CW\*(C`IO::Compress::Bzip2\*(C'\fR
object is destroyed.
.Sp
This parameter defaults to 0.
.ie n .IP """Append => 0|1""" 5
.el .IP "\f(CWAppend => 0|1\fR" 5
.IX Item "Append => 0|1"
Opens \f(CW$output\fR in append mode.
.Sp
The behaviour of this option is dependent on the type of \f(CW$output\fR.
.RS 5
.IP "\(bu" 5
A Buffer
.Sp
If \f(CW$output\fR is a buffer and \f(CW\*(C`Append\*(C'\fR is enabled, all compressed data
will be append to the end if \f(CW$output\fR. Otherwise \f(CW$output\fR will be
cleared before any data is written to it.
.IP "\(bu" 5
A Filename
.Sp
If \f(CW$output\fR is a filename and \f(CW\*(C`Append\*(C'\fR is enabled, the file will be
opened in append mode. Otherwise the contents of the file, if any, will be
truncated before any compressed data is written to it.
.IP "\(bu" 5
A Filehandle
.Sp
If \f(CW$output\fR is a filehandle, the file pointer will be positioned to the
end of the file via a call to \f(CW\*(C`seek\*(C'\fR before any compressed data is written
to it.  Otherwise the file pointer will not be moved.
.RE
.RS 5
.Sp
This parameter defaults to 0.
.RE
.ie n .IP """BlockSize100K => number""" 5
.el .IP "\f(CWBlockSize100K => number\fR" 5
.IX Item "BlockSize100K => number"
Specify the number of 100K blocks bzip2 uses during compression.
.Sp
Valid values are from 1 to 9, where 9 is best compression.
.Sp
The default is 1.
.ie n .IP """WorkFactor => number""" 5
.el .IP "\f(CWWorkFactor => number\fR" 5
.IX Item "WorkFactor => number"
Specifies how much effort bzip2 should take before resorting to a slower
fallback compression algorithm.
.Sp
Valid values range from 0 to 250, where 0 means use the default value 30.
.Sp
The default is 0.
.ie n .IP """Strict => 0|1""" 5
.el .IP "\f(CWStrict => 0|1\fR" 5
.IX Item "Strict => 0|1"
This is a placeholder option.
.SS "Examples"
.IX Subsection "Examples"
\&\s-1TODO\s0
.SH "Methods"
.IX Header "Methods"
.SS "print"
.IX Subsection "print"
Usage is
.PP
.Vb 2
\&    $z\->print($data)
\&    print $z $data
.Ve
.PP
Compresses and outputs the contents of the \f(CW$data\fR parameter. This
has the same behaviour as the \f(CW\*(C`print\*(C'\fR built-in.
.PP
Returns true if successful.
.SS "printf"
.IX Subsection "printf"
Usage is
.PP
.Vb 2
\&    $z\->printf($format, $data)
\&    printf $z $format, $data
.Ve
.PP
Compresses and outputs the contents of the \f(CW$data\fR parameter.
.PP
Returns true if successful.
.SS "syswrite"
.IX Subsection "syswrite"
Usage is
.PP
.Vb 3
\&    $z\->syswrite $data
\&    $z\->syswrite $data, $length
\&    $z\->syswrite $data, $length, $offset
.Ve
.PP
Compresses and outputs the contents of the \f(CW$data\fR parameter.
.PP
Returns the number of uncompressed bytes written, or \f(CW\*(C`undef\*(C'\fR if
unsuccessful.
.SS "write"
.IX Subsection "write"
Usage is
.PP
.Vb 3
\&    $z\->write $data
\&    $z\->write $data, $length
\&    $z\->write $data, $length, $offset
.Ve
.PP
Compresses and outputs the contents of the \f(CW$data\fR parameter.
.PP
Returns the number of uncompressed bytes written, or \f(CW\*(C`undef\*(C'\fR if
unsuccessful.
.SS "flush"
.IX Subsection "flush"
Usage is
.PP
.Vb 1
\&    $z\->flush;
.Ve
.PP
Flushes any pending compressed data to the output file/buffer.
.PP
\&\s-1TODO\s0
.PP
Returns true on success.
.SS "tell"
.IX Subsection "tell"
Usage is
.PP
.Vb 2
\&    $z\->tell()
\&    tell $z
.Ve
.PP
Returns the uncompressed file offset.
.SS "eof"
.IX Subsection "eof"
Usage is
.PP
.Vb 2
\&    $z\->eof();
\&    eof($z);
.Ve
.PP
Returns true if the \f(CW\*(C`close\*(C'\fR method has been called.
.SS "seek"
.IX Subsection "seek"
.Vb 2
\&    $z\->seek($position, $whence);
\&    seek($z, $position, $whence);
.Ve
.PP
Provides a sub-set of the \f(CW\*(C`seek\*(C'\fR functionality, with the restriction
that it is only legal to seek forward in the output file/buffer.
It is a fatal error to attempt to seek backward.
.PP
Empty parts of the file/buffer will have \s-1NULL\s0 (0x00) bytes written to them.
.PP
The \f(CW$whence\fR parameter takes one the usual values, namely \s-1SEEK_SET\s0,
\&\s-1SEEK_CUR\s0 or \s-1SEEK_END\s0.
.PP
Returns 1 on success, 0 on failure.
.SS "binmode"
.IX Subsection "binmode"
Usage is
.PP
.Vb 2
\&    $z\->binmode
\&    binmode $z ;
.Ve
.PP
This is a noop provided for completeness.
.SS "opened"
.IX Subsection "opened"
.Vb 1
\&    $z\->opened()
.Ve
.PP
Returns true if the object currently refers to a opened file/buffer.
.SS "autoflush"
.IX Subsection "autoflush"
.Vb 2
\&    my $prev = $z\->autoflush()
\&    my $prev = $z\->autoflush(EXPR)
.Ve
.PP
If the \f(CW$z\fR object is associated with a file or a filehandle, this method
returns the current autoflush setting for the underlying filehandle. If
\&\f(CW\*(C`EXPR\*(C'\fR is present, and is non-zero, it will enable flushing after every
write/print operation.
.PP
If \f(CW$z\fR is associated with a buffer, this method has no effect and always
returns \f(CW\*(C`undef\*(C'\fR.
.PP
\&\fBNote\fR that the special variable \f(CW$|\fR \fBcannot\fR be used to set or
retrieve the autoflush setting.
.SS "input_line_number"
.IX Subsection "input_line_number"
.Vb 2
\&    $z\->input_line_number()
\&    $z\->input_line_number(EXPR)
.Ve
.PP
This method always returns \f(CW\*(C`undef\*(C'\fR when compressing.
.SS "fileno"
.IX Subsection "fileno"
.Vb 2
\&    $z\->fileno()
\&    fileno($z)
.Ve
.PP
If the \f(CW$z\fR object is associated with a file or a filehandle, \f(CW\*(C`fileno\*(C'\fR
will return the underlying file descriptor. Once the \f(CW\*(C`close\*(C'\fR method is
called \f(CW\*(C`fileno\*(C'\fR will return \f(CW\*(C`undef\*(C'\fR.
.PP
If the \f(CW$z\fR object is is associated with a buffer, this method will return
\&\f(CW\*(C`undef\*(C'\fR.
.SS "close"
.IX Subsection "close"
.Vb 2
\&    $z\->close() ;
\&    close $z ;
.Ve
.PP
Flushes any pending compressed data and then closes the output file/buffer.
.PP
For most versions of Perl this method will be automatically invoked if
the IO::Compress::Bzip2 object is destroyed (either explicitly or by the
variable with the reference to the object going out of scope). The
exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
these cases, the \f(CW\*(C`close\*(C'\fR method will be called automatically, but
not until global destruction of all live objects when the program is
terminating.
.PP
Therefore, if you want your scripts to be able to run on all versions
of Perl, you should call \f(CW\*(C`close\*(C'\fR explicitly and not rely on automatic
closing.
.PP
Returns true on success, otherwise 0.
.PP
If the \f(CW\*(C`AutoClose\*(C'\fR option has been enabled when the IO::Compress::Bzip2
object was created, and the object is associated with a file, the
underlying file will also be closed.
.SS "newStream([\s-1OPTS\s0])"
.IX Subsection "newStream([OPTS])"
Usage is
.PP
.Vb 1
\&    $z\->newStream( [OPTS] )
.Ve
.PP
Closes the current compressed data stream and starts a new one.
.PP
\&\s-1OPTS\s0 consists of any of the the options that are available when creating
the \f(CW$z\fR object.
.PP
See the \*(L"Constructor Options\*(R" section for more details.
.SH "Importing"
.IX Header "Importing"
No symbolic constants are required by this IO::Compress::Bzip2 at present.
.IP ":all" 5
.IX Item ":all"
Imports \f(CW\*(C`bzip2\*(C'\fR and \f(CW$Bzip2Error\fR.
Same as doing this
.Sp
.Vb 1
\&    use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
.Ve
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.SS "Apache::GZip Revisited"
.IX Subsection "Apache::GZip Revisited"
See IO::Compress::Bzip2::FAQ
.SS "Working with Net::FTP"
.IX Subsection "Working with Net::FTP"
See IO::Compress::Bzip2::FAQ
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Compress::Zlib, IO::Compress::Gzip, IO::Uncompress::Gunzip, IO::Compress::Deflate, IO::Uncompress::Inflate, IO::Compress::RawDeflate, IO::Uncompress::RawInflate, IO::Uncompress::Bunzip2, IO::Compress::Lzop, IO::Uncompress::UnLzop, IO::Compress::Lzf, IO::Uncompress::UnLzf, IO::Uncompress::AnyInflate, IO::Uncompress::AnyUncompress
.PP
Compress::Zlib::FAQ
.PP
File::GlobMapper, Archive::Zip,
Archive::Tar,
IO::Zlib
.PP
The primary site for the bzip2 program is \fIhttp://www.bzip.org\fR.
.PP
See the module Compress::Bzip2
.SH "AUTHOR"
.IX Header "AUTHOR"
This module was written by Paul Marquess, \fIpmqs@cpan.org\fR.
.SH "MODIFICATION HISTORY"
.IX Header "MODIFICATION HISTORY"
See the Changes file.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2005\-2008 Paul Marquess. All rights reserved.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
