IO::Compress::Zip(3) User Contributed Perl Documentation IO::Compress::Zip(3)
NAME
IO::Compress::Zip - Write zip files/buffers
SYNOPSIS
use IO::Compress::Zip qw(zip $ZipError) ;
my $status = zip $input => $output [,OPTS]
or die "zip failed: $ZipError\n";
my $z = new IO::Compress::Zip $output [,OPTS]
or die "zip failed: $ZipError\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->deflateParams();
$z->close() ;
$ZipError ;
# 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 zip compressed data to files or
buffer.
The primary purpose of this module is to provide streaming write access to zip files and
buffers. It is not a general-purpose file archiver. If that is what you want, check out
"Archive::Zip".
At present three compression methods are supported by IO::Compress::Zip, namely Store (no
compression at all), Deflate and Bzip2.
Note that to create Bzip2 content, the module "IO::Compress::Bzip2" must be installed.
For reading zip files/buffers, see the companion module IO::Uncompress::Unzip.
Functional Interface
A top-level function, "zip", 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::Zip qw(zip $ZipError) ;
zip $input => $output [,OPTS]
or die "zip failed: $ZipError\n";
The functional interface needs Perl5.005 or better.
zip $input => $output [, OPTS]
"zip" 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 $$input.
An array reference
If $input is an array reference, each element in the array must be a filename.
The input data will be read from each file in turn.
The complete array will be walked to ensure that it only contains valid filenames
before any data is compressed.
An Input FileGlob string
If $input is a string that is delimited by the characters "<" and ">" "zip" will
assume that it is an input fileglob string. The input is the list of files that match
the fileglob.
If the fileglob does not match any files ...
See File::GlobMapper for more details.
If the $input parameter is any other type, "undef" will be returned.
In addition, if $input is a simple filename, the default values for the "Name", "Time",
"ExtAttr" and "exTime" options will be sourced from that file.
If you do not want to use these defaults they can be overridden by explicitly setting the
"Name", "Time", "ExtAttr" and "exTime" options or by setting the "Minimal" parameter.
The $output parameter
The parameter $output is used to control the destination of the compressed data. This
parameter can take one of these forms.
A filename
If the $output parameter is a simple scalar, it is assumed to be a filename. This
file will be opened for writing and the compressed data will be written to it.
A filehandle
If the $output parameter is a filehandle, the compressed data will be written to it.
The string '-' can be used as an alias for standard output.
A scalar reference
If $output is a scalar reference, the compressed data will be stored in $$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 ">" "zip" 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 each be stored in $output as a distinct entry.
Optional Parameters
Unless specified below, the optional parameters for "zip", "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 "zip" that are filehan-
dles.
If "AutoClose" is specified, and the value is true, it will result in all input
and/or output filehandles being closed once "zip" 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.zip".
use strict ;
use warnings ;
use IO::Compress::Zip qw(zip $ZipError) ;
my $input = "file1.txt";
zip $input => "$input.zip"
or die "zip failed: $ZipError\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::Zip qw(zip $ZipError) ;
use IO::File ;
my $input = new IO::File " \$buffer
or die "zip failed: $ZipError\n";
To compress all files in the directory "/my/home" that match "*.txt" and store the com-
pressed data in the same directory
use strict ;
use warnings ;
use IO::Compress::Zip qw(zip $ZipError) ;
zip '' => '<*.zip>'
or die "zip failed: $ZipError\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::Zip qw(zip $ZipError) ;
for my $input ( glob "/my/home/*.txt" )
{
my $output = "$input.zip" ;
zip $input => $output
or die "Error compressing '$input': $ZipError\n";
}
OO Interface
Constructor
The format of the constructor for "IO::Compress::Zip" is shown below
my $z = new IO::Compress::Zip $output [,OPTS]
or die "IO::Compress::Zip failed: $ZipError\n";
It returns an "IO::Compress::Zip" object on success and undef on failure. The variable
$ZipError will contain an error message on failure.
If you are running Perl 5.005 or better the object, $z, returned from IO::Compress::Zip
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::Zip"::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::Zip" 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.
* 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.
* 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.
* 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. Oth-
erwise the file pointer will not be moved.
This parameter defaults to 0.
"Name => $string"
Stores the contents of $string in the zip filename header field. If "Name" is not
specified, no zip filename field will be created.
"Time => $number"
Sets the last modified time field in the zip header to $number.
This field defaults to the time the "IO::Compress::Zip" object was created if this
option is not specified.
"ExtAttr => $attr"
This option controls the "external file attributes" field in the central header of
the zip file. This is a 4 byte field.
If you are running a Unix derivative this value defaults to
0666 << 16
This should allow read/write access to any files that are extracted from the zip
file/buffer.
For all other systems it defaults to 0.
"exTime => [$atime, $mtime, $ctime]"
This option expects an array reference with exactly three elements: $atime, "mtime"
and $ctime. These correspond to the last access time, last modification time and cre-
ation time respectively.
It uses these values to set the extended timestamp field (ID is "UT") in the local
zip header using the three values, $atime, $mtime, $ctime. In addition it sets the
extended timestamp field in the central zip header using $mtime.
If any of the three values is "undef" that time value will not be used. So, for
example, to set only the $mtime you would use this
exTime => [undef, $mtime, undef]
If the "Minimal" option is set to true, this option will be ignored.
By default no extended time field is created.
"exUnix2 => [$uid, $gid]"
This option expects an array reference with exactly two elements: $uid and $gid.
These values correspond to the numeric user ID and group ID of the owner of the files
respectively.
When the "exUnix2" option is present it will trigger the creation of a Unix2 extra
field (ID is "Ux") in the local zip. This will be populated with $uid and $gid. In
addition an empty Unix2 extra field will also be created in the central zip header
If the "Minimal" option is set to true, this option will be ignored.
By default no Unix2 extra field is created.
"Comment => $comment"
Stores the contents of $comment in the Central File Header of the zip file.
By default, no comment field is written to the zip file.
"ZipComment => $comment"
Stores the contents of $comment in the End of Central Directory record of the zip
file.
By default, no comment field is written to the zip file.
"Method => $method"
Controls which compression method is used. At present three compression methods are
supported, namely Store (no compression at all), Deflate and Bzip2.
The symbols, ZIP_CM_STORE, ZIP_CM_DEFLATE and ZIP_CM_BZIP2 are used to select the
compression method.
These constants are not imported by "IO::Compress::Zip" by default.
use IO::Compress::Zip qw(:zip_method);
use IO::Compress::Zip qw(:constants);
use IO::Compress::Zip qw(:all);
Note that to create Bzip2 content, the module "IO::Compress::Bzip2" must be
installed. A fatal error will be thrown if you attempt to create Bzip2 content when
"IO::Compress::Bzip2" is not available.
The default method is ZIP_CM_DEFLATE.
"Stream => 0|1"
This option controls whether the zip file/buffer output is created in streaming mode.
Note that when outputting to a file with streaming mode disabled ("Stream" is 0), the
output file must be seekable.
The default is 1.
"Zip64 => 0|1"
Create a Zip64 zip file/buffer. This option should only be used if you want to store
files larger than 4 Gig.
If you intend to manipulate the Zip64 zip files created with this module using an
external zip/unzip make sure that it supports streaming Zip64.
In particular, if you are using Info-Zip you need to have zip version 3.x or better
to update a Zip64 archive and unzip version 6.x to read a zip64 archive. At the time
of writing both are beta status.
When the "Zip64" option is enabled, the "Stream" option must be enabled as well.
The default is 0.
"TextFlag => 0|1"
This parameter controls the setting of a bit in the zip central header. It is used to
signal that the data stored in the zip file/buffer is probably text.
The default is 0.
"ExtraFieldLocal => $data" =item "ExtraFieldCentral => $data"
The "ExtraFieldLocal" option is used to store additional metadata in the local header
for the zip file/buffer. The "ExtraFieldCentral" does the same for the matching
central header.
An extra field consists of zero or more subfields. Each subfield consists of a two
byte header followed by the subfield data.
The list of subfields can be supplied in any of the following formats
ExtraFieldLocal => [$id1, $data1,
$id2, $data2,
...
]
ExtraFieldLocal => [ [$id1 => $data1],
[$id2 => $data2],
...
]
ExtraFieldLocal => { $id1 => $data1,
$id2 => $data2,
...
}
Where $id1, $id2 are two byte subfield ID's.
If you use the hash syntax, you have no control over the order in which the ExtraSub-
Fields are stored, plus you cannot have SubFields with duplicate ID.
Alternatively the list of subfields can by supplied as a scalar, thus
ExtraField => $rawdata
The Extended Time field (ID "UT"), set using the "exTime" option, and the Unix2 extra
field (ID "Ux), set using the "exUnix2" option, are examples of extra fields.
If the "Minimal" option is set to true, this option will be ignored.
The maximum size of an extra field 65535 bytes.
"Minimal => 1|0"
If specified, this option will disable the creation of all extra fields in the zip
local and central headers. So the "exTime", "exUnix2", "ExtraFieldLocal" and
"ExtraFieldCentral" options will be ignored.
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.
This option is only valid if the "Method" is ZIP_CM_BZIP2. It is ignored otherwise.
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.
This option is only valid if the "Method" is ZIP_CM_BZIP2. It is ignored otherwise.
The default is 0.
-Level
Defines the compression level used by zlib. The value should either be a number
between 0 and 9 (0 means no compression and 9 is maximum compression), or one of the
symbolic constants defined below.
Z_NO_COMPRESSION
Z_BEST_SPEED
Z_BEST_COMPRESSION
Z_DEFAULT_COMPRESSION
The default is Z_DEFAULT_COMPRESSION.
Note, these constants are not imported by "IO::Compress::Zip" by default.
use IO::Compress::Zip qw(:strategy);
use IO::Compress::Zip qw(:constants);
use IO::Compress::Zip qw(:all);
-Strategy
Defines the strategy used to tune the compression. Use one of the symbolic constants
defined below.
Z_FILTERED
Z_HUFFMAN_ONLY
Z_RLE
Z_FIXED
Z_DEFAULT_STRATEGY
The default is Z_DEFAULT_STRATEGY.
"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;
$z->flush($flush_type);
Flushes any pending compressed data to the output file/buffer.
This method takes an optional parameter, $flush_type, that controls how the flushing will
be carried out. By default the $flush_type used is "Z_FINISH". Other valid values for
$flush_type are "Z_NO_FLUSH", "Z_SYNC_FLUSH", "Z_FULL_FLUSH" and "Z_BLOCK". It is strongly
recommended that you only set the "flush_type" parameter if you fully understand the
implications of what it does - overuse of "flush" can seriously degrade the level of com-
pression achieved. See the "zlib" documentation for details.
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 back-
ward.
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 cur-
rent 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::Com-
press::Zip 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::Zip 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.
deflateParams
Usage is
$z->deflateParams
TODO
Importing
A number of symbolic constants are required by some methods in "IO::Compress::Zip". None
are imported by default.
:all Imports "zip", $ZipError and all symbolic constants that can be used by "IO::Com-
press::Zip". Same as doing this
use IO::Compress::Zip qw(zip $ZipError :constants) ;
:constants
Import all symbolic constants. Same as doing this
use IO::Compress::Zip qw(:flush :level :strategy :zip_method) ;
:flush
These symbolic constants are used by the "flush" method.
Z_NO_FLUSH
Z_PARTIAL_FLUSH
Z_SYNC_FLUSH
Z_FULL_FLUSH
Z_FINISH
Z_BLOCK
:level
These symbolic constants are used by the "Level" option in the constructor.
Z_NO_COMPRESSION
Z_BEST_SPEED
Z_BEST_COMPRESSION
Z_DEFAULT_COMPRESSION
:strategy
These symbolic constants are used by the "Strategy" option in the constructor.
Z_FILTERED
Z_HUFFMAN_ONLY
Z_RLE
Z_FIXED
Z_DEFAULT_STRATEGY
:zip_method
These symbolic constants are used by the "Method" option in the constructor.
ZIP_CM_STORE
ZIP_CM_DEFLATE
ZIP_CM_BZIP2
EXAMPLES
Apache::GZip Revisited
See IO::Compress::FAQ
Working with Net::FTP
See IO::Compress::FAQ
SEE ALSO
Compress::Zlib, IO::Compress::Gzip, IO::Uncompress::Gunzip, IO::Compress::Deflate,
IO::Uncompress::Inflate, IO::Compress::RawDeflate, IO::Uncompress::RawInflate, IO::Com-
press::Bzip2, IO::Uncompress::Bunzip2, IO::Compress::Lzop, IO::Uncompress::UnLzop,
IO::Compress::Lzf, IO::Uncompress::UnLzf, IO::Uncompress::AnyInflate, IO::Uncom-
press::AnyUncompress
Compress::Zlib::FAQ
File::GlobMapper, Archive::Zip, Archive::Tar, IO::Zlib
For RFC 1950, 1951 and 1952 see http://www.faqs.org/rfcs/rfc1950.html,
http://www.faqs.org/rfcs/rfc1951.html and http://www.faqs.org/rfcs/rfc1952.html
The zlib compression library was written by Jean-loup Gailly and Mark
Adler .
The primary site for the zlib compression library is http://www.zlib.org.
The primary site for gzip is http://www.gzip.org.
AUTHOR
This module was written by Paul Marquess, .
MODIFICATION HISTORY
See the Changes file.
COPYRIGHT AND LICENSE
Copyright (c) 2005-2009 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 v5.8.8 2009-03-28 IO::Compress::Zip(3)
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