IO::Compress::Bzip2(3)User Contributed Perl DocumentatioIO::Compress::Bzip2(3)
NAME
IO::Compress::Bzip2 - Write bzip2 files/buffers
SYNOPSIS
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
my $status = bzip2 $input => $output [,OPTS]
or die "bzip2 failed: $Bzip2Error\n";
my $z = new IO::Compress::Bzip2 $output [,OPTS]
or die "bzip2 failed: $Bzip2Error\n";
$z->print($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 ;
DESCRIPTION
This module provides a Perl interface that allows writing bzip2
compressed data to files or buffer.
For reading bzip2 files/buffers, see the companion module
IO::Uncompress::Bunzip2.
Functional Interface
A top-level function, "bzip2", is provided to carry out "one-shot"
compression between buffers and/or files. For finer control over the
compression process, see the "OO Interface" section.
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
bzip2 $input => $output [,OPTS]
or die "bzip2 failed: $Bzip2Error\n";
The functional interface needs Perl5.005 or better.
bzip2 $input => $output [, OPTS]
"bzip2" expects at least two parameters, $input and $output.
The $input parameter
The parameter, $input, is used to define the source of the uncompressed
data.
It can take one of the following forms:
A filename
If the $input 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.
A filehandle
If the $input parameter is a filehandle, the input data will be
read from it. The string '-' can be used as an alias for standard
input.
A scalar reference
If $input is a scalar reference, the input data will be read from
$$input.
An array reference
If $input is an array reference, each element in the array must be
a filename.
The input data will be read from each file in turn.
The complete array will be walked to ensure that it only contains
valid filenames before any data is compressed.
An Input FileGlob string
If $input is a string that is delimited by the characters "<" and
">" "bzip2" will assume that it is an input fileglob string. The
input is the list of files that match the fileglob.
If the fileglob does not match any files ...
See File::GlobMapper for more details.
If the $input parameter is any other type, "undef" will be returned.
The $output parameter
The parameter $output is used to control the destination of the
compressed data. This parameter can take one of these forms.
A filename
If the $output parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for writing and the compressed
data will be written to it.
A filehandle
If the $output parameter is a filehandle, the compressed data will
be written to it. The string '-' can be used as an alias for
standard output.
A scalar reference
If $output is a scalar reference, the compressed data will be
stored in $$output.
An Array Reference
If $output is an array reference, the compressed data will be
pushed onto the array.
An Output FileGlob
If $output is a string that is delimited by the characters "<" and
">" "bzip2" will assume that it is an output fileglob string. The
output is the list of files that match the fileglob.
When $output is an fileglob string, $input must also be a fileglob
string. Anything else is an error.
If the $output parameter is any other type, "undef" will be returned.
Notes
When $input maps to multiple files/buffers and $output is a single
file/buffer the input files/buffers will be stored in $output as a
concatenated series of compressed data streams.
Optional Parameters
Unless specified below, the optional parameters for "bzip2", "OPTS",
are the same as those used with the OO interface defined in the
"Constructor Options" section below.
"AutoClose => 0|1"
This option applies to any input or output data streams to "bzip2"
that are filehandles.
If "AutoClose" is specified, and the value is true, it will result
in all input and/or output filehandles being closed once "bzip2"
has completed.
This parameter defaults to 0.
"BinModeIn => 0|1"
When reading from a file or filehandle, set "binmode" before
reading.
Defaults to 0.
"Append => 0|1"
TODO
Examples
To read the contents of the file "file1.txt" and write the compressed
data to the file "file1.txt.bz2".
use strict ;
use warnings ;
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
my $input = "file1.txt";
bzip2 $input => "$input.bz2"
or die "bzip2 failed: $Bzip2Error\n";
To read from an existing Perl filehandle, $input, and write the
compressed data to a buffer, $buffer.
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 'file1.txt': $!\n" ;
my $buffer ;
bzip2 $input => \$buffer
or die "bzip2 failed: $Bzip2Error\n";
To compress all files in the directory "/my/home" that match "*.txt"
and store the compressed data in the same directory
use strict ;
use warnings ;
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
bzip2 '</my/home/*.txt>' => '<*.bz2>'
or die "bzip2 failed: $Bzip2Error\n";
and if you want to compress each file one at a time, this will do the
trick
use strict ;
use warnings ;
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
for my $input ( glob "/my/home/*.txt" )
{
my $output = "$input.bz2" ;
bzip2 $input => $output
or die "Error compressing '$input': $Bzip2Error\n";
}
OO Interface
Constructor
The format of the constructor for "IO::Compress::Bzip2" is shown below
my $z = new IO::Compress::Bzip2 $output [,OPTS]
or die "IO::Compress::Bzip2 failed: $Bzip2Error\n";
It returns an "IO::Compress::Bzip2" object on success and undef on
failure. The variable $Bzip2Error will contain an error message on
failure.
If you are running Perl 5.005 or better the object, $z, 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 $z. For example, to write to a compressed file/buffer you can use
either of these forms
$z->print("hello world\n");
print $z "hello world\n";
The mandatory parameter $output is used to control the destination of
the compressed data. This parameter can take one of these forms.
A filename
If the $output 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.
A filehandle
If the $output parameter is a filehandle, the compressed data will
be written to it. The string '-' can be used as an alias for
standard output.
A scalar reference
If $output is a scalar reference, the compressed data will be
stored in $$output.
If the $output parameter is any other type, "IO::Compress::Bzip2"::new
will return undef.
Constructor Options
"OPTS" is any combination of the following options:
"AutoClose => 0|1"
This option is only valid when the $output parameter is a
filehandle. If specified, and the value is true, it will result in
the $output being closed once either the "close" method is called
or the "IO::Compress::Bzip2" object is destroyed.
This parameter defaults to 0.
"Append => 0|1"
Opens $output in append mode.
The behaviour of this option is dependent on the type of $output.
o A Buffer
If $output is a buffer and "Append" is enabled, all
compressed data will be append to the end if $output.
Otherwise $output will be cleared before any data is written
to it.
o A Filename
If $output is a filename and "Append" 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.
o A Filehandle
If $output is a filehandle, the file pointer will be
positioned to the end of the file via a call to "seek" before
any compressed data is written to it. Otherwise the file
pointer will not be moved.
This parameter defaults to 0.
"BlockSize100K => number"
Specify the number of 100K blocks bzip2 uses during compression.
Valid values are from 1 to 9, where 9 is best compression.
The default is 1.
"WorkFactor => number"
Specifies how much effort bzip2 should take before resorting to a
slower fallback compression algorithm.
Valid values range from 0 to 250, where 0 means use the default
value 30.
The default is 0.
"Strict => 0|1"
This is a placeholder option.
Examples
TODO
Methods
print
Usage is
$z->print($data)
print $z $data
Compresses and outputs the contents of the $data parameter. This has
the same behaviour as the "print" built-in.
Returns true if successful.
printf
Usage is
$z->printf($format, $data)
printf $z $format, $data
Compresses and outputs the contents of the $data parameter.
Returns true if successful.
syswrite
Usage is
$z->syswrite $data
$z->syswrite $data, $length
$z->syswrite $data, $length, $offset
Compresses and outputs the contents of the $data parameter.
Returns the number of uncompressed bytes written, or "undef" if
unsuccessful.
write
Usage is
$z->write $data
$z->write $data, $length
$z->write $data, $length, $offset
Compresses and outputs the contents of the $data parameter.
Returns the number of uncompressed bytes written, or "undef" if
unsuccessful.
flush
Usage is
$z->flush;
Flushes any pending compressed data to the output file/buffer.
TODO
Returns true on success.
tell
Usage is
$z->tell()
tell $z
Returns the uncompressed file offset.
eof
Usage is
$z->eof();
eof($z);
Returns true if the "close" method has been called.
seek
$z->seek($position, $whence);
seek($z, $position, $whence);
Provides a sub-set of the "seek" 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.
Empty parts of the file/buffer will have NULL (0x00) bytes written to
them.
The $whence parameter takes one the usual values, namely SEEK_SET,
SEEK_CUR or SEEK_END.
Returns 1 on success, 0 on failure.
binmode
Usage is
$z->binmode
binmode $z ;
This is a noop provided for completeness.
opened
$z->opened()
Returns true if the object currently refers to a opened file/buffer.
autoflush
my $prev = $z->autoflush()
my $prev = $z->autoflush(EXPR)
If the $z object is associated with a file or a filehandle, this method
returns the current autoflush setting for the underlying filehandle. If
"EXPR" is present, and is non-zero, it will enable flushing after every
write/print operation.
If $z is associated with a buffer, this method has no effect and always
returns "undef".
Note that the special variable $| cannot be used to set or retrieve the
autoflush setting.
input_line_number
$z->input_line_number()
$z->input_line_number(EXPR)
This method always returns "undef" when compressing.
fileno
$z->fileno()
fileno($z)
If the $z object is associated with a file or a filehandle, "fileno"
will return the underlying file descriptor. Once the "close" method is
called "fileno" will return "undef".
If the $z object is is associated with a buffer, this method will
return "undef".
close
$z->close() ;
close $z ;
Flushes any pending compressed data and then closes the output
file/buffer.
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 "close" method will be called automatically, but not until
global destruction of all live objects when the program is terminating.
Therefore, if you want your scripts to be able to run on all versions
of Perl, you should call "close" explicitly and not rely on automatic
closing.
Returns true on success, otherwise 0.
If the "AutoClose" 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.
newStream([OPTS])
Usage is
$z->newStream( [OPTS] )
Closes the current compressed data stream and starts a new one.
OPTS consists of any of the the options that are available when
creating the $z object.
See the "Constructor Options" section for more details.
Importing
No symbolic constants are required by this IO::Compress::Bzip2 at
present.
:all Imports "bzip2" and $Bzip2Error. Same as doing this
use IO::Compress::Bzip2 qw(bzip2 $Bzip2Error) ;
EXAMPLES
Apache::GZip Revisited
See IO::Compress::Bzip2::FAQ
Working with Net::FTP
See IO::Compress::Bzip2::FAQ
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
Compress::Zlib::FAQ
File::GlobMapper, Archive::Zip, Archive::Tar, IO::Zlib
The primary site for the bzip2 program is http://www.bzip.org.
See the module Compress::Bzip2
AUTHOR
This module was written by Paul Marquess, pmqs AT cpan.org.
MODIFICATION HISTORY
See the Changes file.
COPYRIGHT AND LICENSE
Copyright (c) 2005-2008 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.
perl v5.16.3 2013-05-19 IO::Compress::Bzip2(3)
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