package IO::Compress::Zip ;
use strict ;
use warnings;
use bytes;
use IO::Compress::Base::Common qw(:Status createSelfTiedObject);
use IO::Compress::RawDeflate;
use IO::Compress::Adapter::Deflate;
use IO::Compress::Adapter::Identity;
use IO::Compress::Zlib::Extra;
use IO::Compress::Zip::Constants;
use Compress::Raw::Zlib qw(crc32) ;
BEGIN
{
eval { require IO::Compress::Adapter::Bzip2;
import IO::Compress::Adapter::Bzip2;
require IO::Compress::Bzip2;
import IO::Compress::Bzip2;
} ;
}
require Exporter ;
our ($VERSION, @ISA, @EXPORT_OK, %EXPORT_TAGS, $ZipError);
$VERSION = '2.000_13';
$ZipError = '';
@ISA = qw(Exporter IO::Compress::RawDeflate);
@EXPORT_OK = qw( $ZipError zip ) ;
%EXPORT_TAGS = %IO::Compress::RawDeflate::DEFLATE_CONSTANTS ;
push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ;
$EXPORT_TAGS{zip_method} = [qw( ZIP_CM_STORE ZIP_CM_DEFLATE ZIP_CM_BZIP2 )];
push @{ $EXPORT_TAGS{all} }, @{ $EXPORT_TAGS{zip_method} };
Exporter::export_ok_tags('all');
sub new
{
my $class = shift ;
my $obj = createSelfTiedObject($class, \$ZipError);
$obj->_create(undef, @_);
}
sub zip
{
my $obj = createSelfTiedObject(undef, \$ZipError);
return $obj->_def(@_);
}
sub mkComp
{
my $self = shift ;
my $class = shift ;
my $got = shift ;
my ($obj, $errstr, $errno) ;
if (*$self->{ZipData}{Method} == ZIP_CM_STORE) {
($obj, $errstr, $errno) = IO::Compress::Adapter::Identity::mkCompObject(
$got->value('Level'),
$got->value('Strategy')
);
}
elsif (*$self->{ZipData}{Method} == ZIP_CM_DEFLATE) {
($obj, $errstr, $errno) = IO::Compress::Adapter::Deflate::mkCompObject(
$got->value('CRC32'),
$got->value('Adler32'),
$got->value('Level'),
$got->value('Strategy')
);
}
elsif (*$self->{ZipData}{Method} == ZIP_CM_BZIP2) {
($obj, $errstr, $errno) = IO::Compress::Adapter::Bzip2::mkCompObject(
$got->value('BlockSize100K'),
$got->value('WorkFactor'),
$got->value('Verbosity')
);
*$self->{ZipData}{CRC32} = crc32(undef);
}
return $self->saveErrorString(undef, $errstr, $errno)
if ! defined $obj;
if (! defined *$self->{ZipData}{StartOffset}) {
*$self->{ZipData}{StartOffset} = 0;
*$self->{ZipData}{Offset} = new U64 ;
}
return $obj;
}
sub reset
{
my $self = shift ;
*$self->{Compress}->reset();
*$self->{ZipData}{CRC32} = Compress::Raw::Zlib::crc32('');
return STATUS_OK;
}
sub filterUncompressed
{
my $self = shift ;
if (*$self->{ZipData}{Method} == ZIP_CM_DEFLATE) {
*$self->{ZipData}{CRC32} = *$self->{Compress}->crc32();
}
else {
*$self->{ZipData}{CRC32} = crc32(${$_[0]}, *$self->{ZipData}{CRC32});
}
}
sub mkHeader
{
my $self = shift;
my $param = shift ;
*$self->{ZipData}{StartOffset} = *$self->{ZipData}{Offset}->get32bit() ;
my $filename = '';
$filename = $param->value('Name') || '';
my $comment = '';
$comment = $param->value('Comment') || '';
my $hdr = '';
my $time = _unixToDosTime($param->value('Time'));
my $extra = '';
my $ctlExtra = '';
my $empty = 0;
if (*$self->{ZipData}{Zip64}) {
$empty = 0xFFFF;
my $x = '';
$x .= pack "V V", 0, 0 ; # uncompressedLength
$x .= pack "V V", 0, 0 ; # compressedLength
$x .= *$self->{ZipData}{Offset}->getPacked_V64() ; # offset to local hdr
#$x .= pack "V ", 0 ; # disk no
$x = IO::Compress::Zlib::Extra::mkSubField(ZIP_EXTRA_ID_ZIP64, $x);
$extra .= $x;
$ctlExtra .= $x;
}
if (! $param->value('Minimal')) {
if (defined $param->value('exTime'))
{
$extra .= mkExtendedTime($param->value('MTime'),
$param->value('ATime'),
$param->value('CTime'));
$ctlExtra .= mkExtendedTime($param->value('MTime'));
}
# if ( $param->value('UID'))
# {
# $extra .= mkUnixExtra( $param->value('UID'), $param->value('GID'));
# $ctlExtra .= mkUnixExtra();
# }
$extra .= $param->value('ExtraFieldLocal')
if defined $param->value('ExtraFieldLocal');
$ctlExtra .= $param->value('ExtraFieldCentral')
if defined $param->value('ExtraFieldCentral');
}
my $extAttr = 0;
$extAttr = $param->value('Mode') << 16
if defined $param->value('Mode') ;
my $gpFlag = 0 ;
$gpFlag |= ZIP_GP_FLAG_STREAMING_MASK
if *$self->{ZipData}{Stream} ;
my $method = *$self->{ZipData}{Method} ;
my $version = $ZIP_CM_MIN_VERSIONS{$method};
$version = ZIP64_MIN_VERSION
if ZIP64_MIN_VERSION > $version && *$self->{ZipData}{Zip64};
my $madeBy = ($param->value('OS_Code') << 8) + $version;
my $extract = $version;
*$self->{ZipData}{Version} = $version;
*$self->{ZipData}{MadeBy} = $madeBy;
my $ifa = 0;
$ifa |= ZIP_IFA_TEXT_MASK
if $param->value('TextFlag');
$hdr .= pack "V", ZIP_LOCAL_HDR_SIG ; # signature
$hdr .= pack 'v', $extract ; # extract Version & OS
$hdr .= pack 'v', $gpFlag ; # general purpose flag (set streaming mode)
$hdr .= pack 'v', $method ; # compression method (deflate)
$hdr .= pack 'V', $time ; # last mod date/time
$hdr .= pack 'V', 0 ; # crc32 - 0 when streaming
$hdr .= pack 'V', $empty ; # compressed length - 0 when streaming
$hdr .= pack 'V', $empty ; # uncompressed length - 0 when streaming
$hdr .= pack 'v', length $filename ; # filename length
$hdr .= pack 'v', length $extra ; # extra length
$hdr .= $filename ;
$hdr .= $extra ;
my $ctl = '';
$ctl .= pack "V", ZIP_CENTRAL_HDR_SIG ; # signature
$ctl .= pack 'v', $madeBy ; # version made by
$ctl .= pack 'v', $extract ; # extract Version
$ctl .= pack 'v', $gpFlag ; # general purpose flag (streaming mode)
$ctl .= pack 'v', $method ; # compression method (deflate)
$ctl .= pack 'V', $time ; # last mod date/time
$ctl .= pack 'V', 0 ; # crc32
$ctl .= pack 'V', $empty ; # compressed length
$ctl .= pack 'V', $empty ; # uncompressed length
$ctl .= pack 'v', length $filename ; # filename length
$ctl .= pack 'v', length $ctlExtra ; # extra length
$ctl .= pack 'v', length $comment ; # file comment length
$ctl .= pack 'v', 0 ; # disk number start
$ctl .= pack 'v', $ifa ; # internal file attributes
$ctl .= pack 'V', $extAttr ; # external file attributes
if (! *$self->{ZipData}{Zip64}) {
$ctl .= pack 'V', *$self->{ZipData}{Offset}->get32bit() ; # offset to local header
}
else {
$ctl .= pack 'V', $empty ; # offset to local header
}
$ctl .= $filename ;
*$self->{ZipData}{StartOffset64} = 4 + length $ctl;
$ctl .= $ctlExtra ;
$ctl .= $comment ;
*$self->{ZipData}{Offset}->add(length $hdr) ;
*$self->{ZipData}{CentralHeader} = $ctl;
return $hdr;
}
sub mkTrailer
{
my $self = shift ;
my $crc32 ;
if (*$self->{ZipData}{Method} == ZIP_CM_DEFLATE) {
$crc32 = pack "V", *$self->{Compress}->crc32();
}
else {
$crc32 = pack "V", *$self->{ZipData}{CRC32};
}
my $ctl = *$self->{ZipData}{CentralHeader} ;
my $sizes ;
if (! *$self->{ZipData}{Zip64}) {
$sizes .= *$self->{CompSize}->getPacked_V32() ; # Compressed size
$sizes .= *$self->{UnCompSize}->getPacked_V32() ; # Uncompressed size
}
else {
$sizes .= *$self->{CompSize}->getPacked_V64() ; # Compressed size
$sizes .= *$self->{UnCompSize}->getPacked_V64() ; # Uncompressed size
}
my $data = $crc32 . $sizes ;
my $hdr = '';
if (*$self->{ZipData}{Stream}) {
$hdr = pack "V", ZIP_DATA_HDR_SIG ; # signature
$hdr .= $data ;
}
else {
$self->writeAt(*$self->{ZipData}{StartOffset} + 14, $data)
or return undef;
}
if (! *$self->{ZipData}{Zip64})
{ substr($ctl, 16, length $data) = $data }
else {
substr($ctl, 16, length $crc32) = $crc32 ;
my $s = *$self->{UnCompSize}->getPacked_V64() ; # Uncompressed size
$s .= *$self->{CompSize}->getPacked_V64() ; # Compressed size
substr($ctl, *$self->{ZipData}{StartOffset64}, length $s) = $s ;
}
*$self->{ZipData}{Offset}->add(length($hdr));
*$self->{ZipData}{Offset}->add( *$self->{CompSize} );
push @{ *$self->{ZipData}{CentralDir} }, $ctl ;
return $hdr;
}
sub mkFinalTrailer
{
my $self = shift ;
my $comment = '';
$comment = *$self->{ZipData}{ZipComment} ;
my $cd_offset = *$self->{ZipData}{Offset}->get32bit() ; # offset to start central dir
my $entries = @{ *$self->{ZipData}{CentralDir} };
my $cd = join '', @{ *$self->{ZipData}{CentralDir} };
my $cd_len = length $cd ;
my $z64e = '';
if ( *$self->{ZipData}{Zip64} ) {
my $v = *$self->{ZipData}{Version} ;
my $mb = *$self->{ZipData}{MadeBy} ;
$z64e .= pack 'v', $v ; # Version made by
$z64e .= pack 'v', $mb ; # Version to extract
$z64e .= pack 'V', 0 ; # number of disk
$z64e .= pack 'V', 0 ; # number of disk with central dir
$z64e .= U64::pack_V64 $entries ; # entries in central dir on this disk
$z64e .= U64::pack_V64 $entries ; # entries in central dir
$z64e .= U64::pack_V64 $cd_len ; # size of central dir
$z64e .= *$self->{ZipData}{Offset}->getPacked_V64() ; # offset to start central dir
$z64e = pack("V", ZIP64_END_CENTRAL_REC_HDR_SIG) # signature
. U64::pack_V64(length $z64e)
. $z64e ;
*$self->{ZipData}{Offset}->add(length $cd) ;
$z64e .= pack "V", ZIP64_END_CENTRAL_LOC_HDR_SIG; # signature
$z64e .= pack 'V', 0 ; # number of disk with central dir
$z64e .= *$self->{ZipData}{Offset}->getPacked_V64() ; # offset to end zip64 central dir
$z64e .= pack 'V', 1 ; # Total number of disks
# TODO - fix these when info-zip 3 is fixed.
#$cd_len =
#$cd_offset =
$entries = 0xFFFF ;
}
my $ecd = '';
$ecd .= pack "V", ZIP_END_CENTRAL_HDR_SIG ; # signature
$ecd .= pack 'v', 0 ; # number of disk
$ecd .= pack 'v', 0 ; # number of disk with central dir
$ecd .= pack 'v', $entries ; # entries in central dir on this disk
$ecd .= pack 'v', $entries ; # entries in central dir
$ecd .= pack 'V', $cd_len ; # size of central dir
$ecd .= pack 'V', $cd_offset ; # offset to start central dir
$ecd .= pack 'v', length $comment ; # zipfile comment length
$ecd .= $comment;
return $cd . $z64e . $ecd ;
}
sub ckParams
{
my $self = shift ;
my $got = shift;
$got->value('CRC32' => 1);
if (! $got->parsed('Time') ) {
# Modification time defaults to now.
$got->value('Time' => time) ;
}
if (! $got->parsed('exTime') ) {
my $timeRef = $got->value('exTime');
if ( defined $timeRef) {
return $self->saveErrorString(undef, "exTime not a 3-element array ref")
if ref $timeRef ne 'ARRAY' || @$timeRef != 3;
}
$got->value("MTime", $timeRef->[1]);
$got->value("ATime", $timeRef->[0]);
$got->value("CTime", $timeRef->[2]);
}
*$self->{ZipData}{Zip64} = $got->value('Zip64');
*$self->{ZipData}{Stream} = $got->value('Stream');
return $self->saveErrorString(undef, "Zip64 only supported if Stream enabled")
if *$self->{ZipData}{Zip64} && ! *$self->{ZipData}{Stream} ;
my $method = $got->value('Method');
return $self->saveErrorString(undef, "Unknown Method '$method'")
if ! defined $ZIP_CM_MIN_VERSIONS{$method};
return $self->saveErrorString(undef, "Bzip2 not available")
if $method == ZIP_CM_BZIP2 and
! defined $IO::Compress::Adapter::Bzip2::VERSION;
*$self->{ZipData}{Method} = $method;
*$self->{ZipData}{ZipComment} = $got->value('ZipComment') ;
for my $name (qw( ExtraFieldLocal ExtraFieldCentral ))
{
my $data = $got->value($name) ;
if (defined $data) {
my $bad = IO::Compress::Zlib::Extra::parseExtraField($data, 1, 0) ;
return $self->saveErrorString(undef, "Error with $name Parameter: $bad")
if $bad ;
$got->value($name, $data) ;
}
}
return undef
if defined $IO::Compress::Bzip2::VERSION
and ! IO::Compress::Bzip2::ckParams($self, $got);
return 1 ;
}
#sub newHeader
#{
# my $self = shift ;
#
# return $self->mkHeader(*$self->{Got});
#}
sub getExtraParams
{
my $self = shift ;
use IO::Compress::Base::Common qw(:Parse);
use Compress::Raw::Zlib qw(Z_DEFLATED Z_DEFAULT_COMPRESSION Z_DEFAULT_STRATEGY);
my @Bzip2 = ();
@Bzip2 = IO::Compress::Bzip2::getExtraParams($self)
if defined $IO::Compress::Bzip2::VERSION;
return (
# zlib behaviour
$self->getZlibParams(),
'Stream' => [1, 1, Parse_boolean, 1],
#'Store' => [0, 1, Parse_boolean, 0],
'Method' => [0, 1, Parse_unsigned, ZIP_CM_DEFLATE],
# # Zip header fields
'Minimal' => [0, 1, Parse_boolean, 0],
'Zip64' => [0, 1, Parse_boolean, 0],
'Comment' => [0, 1, Parse_any, ''],
'ZipComment'=> [0, 1, Parse_any, ''],
'Name' => [0, 1, Parse_any, ''],
'Time' => [0, 1, Parse_any, undef],
'exTime' => [0, 1, Parse_any, undef],
'OS_Code' => [0, 1, Parse_unsigned, $Compress::Raw::Zlib::gzip_os_code],
'TextFlag' => [0, 1, Parse_boolean, 0],
'ExtraFieldLocal' => [0, 1, Parse_any, undef],
'ExtraFieldCentral'=> [0, 1, Parse_any, undef],
@Bzip2,
);
}
sub getInverseClass
{
return ('IO::Uncompress::Unzip',
\$IO::Uncompress::Unzip::UnzipError);
}
sub getFileInfo
{
my $self = shift ;
my $params = shift;
my $filename = shift ;
my ($mode, $uid, $gid, $atime, $mtime, $ctime)
= (stat($filename))[2, 4,5, 8,9,10] ;
$params->value('Name' => $filename)
if ! $params->parsed('Name') ;
$params->value('Time' => $mtime)
if ! $params->parsed('Time') ;
if ( ! $params->parsed('exTime'))
{
$params->value('MTime' => $mtime) ;
$params->value('ATime' => $atime) ;
$params->value('CTime' => $ctime) ;
}
$params->value('Mode' => $mode) ;
$params->value('UID' => $uid) ;
$params->value('GID' => $gid) ;
}
sub mkExtendedTime
{
# order expected is m, a, c
my $times = '';
my $bit = 1 ;
my $flags = 0;
for my $time (@_)
{
if (defined $time)
{
$flags |= $bit;
$times .= pack("V", $time);
}
$bit <<= 1 ;
}
#return "UT" . pack("v C", length($times) + 1, $flags) . $times;
return IO::Compress::Zlib::Extra::mkSubField(ZIP_EXTRA_ID_EXT_TIMESTAMP,
pack("C", $flags) . $times);
}
sub mkUnixExtra
{
my $ids = '';
for my $id (@_)
{
$ids .= pack("v", $id);
}
#return "Ux" . pack("v", length $ids) . $ids;
return IO::Compress::Zlib::Extra::mkSubField(ZIP_EXTRA_ID_INFO_ZIP_UNIX, $ids);
}
# from Archive::Zip
sub _unixToDosTime # Archive::Zip::Member
{
my $time_t = shift;
# TODO - add something to cope with unix time < 1980
my ( $sec, $min, $hour, $mday, $mon, $year ) = localtime($time_t);
my $dt = 0;
$dt += ( $sec >> 1 );
$dt += ( $min << 5 );
$dt += ( $hour << 11 );
$dt += ( $mday << 16 );
$dt += ( ( $mon + 1 ) << 21 );
$dt += ( ( $year - 80 ) << 25 );
return $dt;
}
1;
__END__
=head1 NAME
IO::Compress::Zip - Write zip files/buffers
=head1 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 ;
=head1 DESCRIPTION
B<WARNING -- This is a Beta release>.
=over 5
=item * DO NOT use in production code.
=item * The documentation is incomplete in places.
=item * Parts of the interface defined here are tentative.
=item * Please report any problems you find.
=back
This module provides a Perl interface that allows writing zip
compressed data to files or buffer.
Note that IO::Compress::Zip is not intended to be a replacement for the module
C<Archive::Zip>.
The primary aim of this module is not as an archiver, but to provide
streaming write access to zip file files and buffers.
For reading zip files/buffers, see the companion module
L<IO::Uncompress::Unzip|IO::Uncompress::Unzip>.
=head1 Functional Interface
A top-level function, C<zip>, is provided to carry out
"one-shot" compression between buffers and/or files. For finer
control over the compression process, see the L</"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.
=head2 zip $input => $output [, OPTS]
C<zip> expects at least two parameters, C<$input> and C<$output>.
=head3 The C<$input> parameter
The parameter, C<$input>, is used to define the source of
the uncompressed data.
It can take one of the following forms:
=over 5
=item A filename
If the C<$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.
=item A filehandle
If the C<$input> parameter is a filehandle, the input data will be
read from it.
The string '-' can be used as an alias for standard input.
=item A scalar reference
If C<$input> is a scalar reference, the input data will be read
from C<$$input>.
=item An array reference
If C<$input> is an array reference, each element in the array must be a
filename.
The input data will be read from each file in turn.
The complete array will be walked to ensure that it only
contains valid filenames before any data is compressed.
=item An Input FileGlob string
If C<$input> is a string that is delimited by the characters "<" and ">"
C<zip> will assume that it is an I<input fileglob string>. The
input is the list of files that match the fileglob.
If the fileglob does not match any files ...
See L<File::GlobMapper|File::GlobMapper> for more details.
=back
If the C<$input> parameter is any other type, C<undef> will be returned.
In addition, if C<$input> is a simple filename, the default values for
the C<Name>, C<Time> and C<exTime> options will be sourced from that file.
If you do not want to use these defaults they can be overridden by
explicitly setting the C<Name>, C<Time> and C<exTime> options or by setting the
C<Minimal> parameter.
=head3 The C<$output> parameter
The parameter C<$output> is used to control the destination of the
compressed data. This parameter can take one of these forms.
=over 5
=item A filename
If the C<$output> parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for writing and the compressed
data will be written to it.
=item A filehandle
If the C<$output> parameter is a filehandle, the compressed data
will be written to it.
The string '-' can be used as an alias for standard output.
=item A scalar reference
If C<$output> is a scalar reference, the compressed data will be
stored in C<$$output>.
=item An Array Reference
If C<$output> is an array reference, the compressed data will be
pushed onto the array.
=item An Output FileGlob
If C<$output> is a string that is delimited by the characters "<" and ">"
C<zip> will assume that it is an I<output fileglob string>. The
output is the list of files that match the fileglob.
When C<$output> is an fileglob string, C<$input> must also be a fileglob
string. Anything else is an error.
=back
If the C<$output> parameter is any other type, C<undef> will be returned.
=head2 Notes
When C<$input> maps to multiple files/buffers and C<$output> is a single
file/buffer the input files/buffers will each be stored
in C<$output> as a distinct entry.
=head2 Optional Parameters
Unless specified below, the optional parameters for C<zip>,
C<OPTS>, are the same as those used with the OO interface defined in the
L</"Constructor Options"> section below.
=over 5
=item C<< AutoClose => 0|1 >>
This option applies to any input or output data streams to
C<zip> that are filehandles.
If C<AutoClose> is specified, and the value is true, it will result in all
input and/or output filehandles being closed once C<zip> has
completed.
This parameter defaults to 0.
=item C<< BinModeIn => 0|1 >>
When reading from a file or filehandle, set C<binmode> before reading.
Defaults to 0.
=item C<< Append => 0|1 >>
TODO
=back
=head2 Examples
To read the contents of the file C<file1.txt> and write the compressed
data to the file C<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: $ZipError\n";
To read from an existing Perl filehandle, C<$input>, and write the
compressed data to a buffer, C<$buffer>.
use strict ;
use warnings ;
use IO::Compress::Zip qw(zip $ZipError) ;
use IO::File ;
my $input = new IO::File "<file1.txt"
or die "Cannot open 'file1.txt': $!\n" ;
my $buffer ;
zip $input => \$buffer
or die "zip failed: $ZipError\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::Zip qw(zip $ZipError) ;
zip '</my/home/*.txt>' => '<*.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";
}
=head1 OO Interface
=head2 Constructor
The format of the constructor for C<IO::Compress::Zip> is shown below
my $z = new IO::Compress::Zip $output [,OPTS]
or die "IO::Compress::Zip failed: $ZipError\n";
It returns an C<IO::Compress::Zip> object on success and undef on failure.
The variable C<$ZipError> will contain an error message on failure.
If you are running Perl 5.005 or better the object, C<$z>, returned from
IO::Compress::Zip can be used exactly like an L<IO::File|IO::File> filehandle.
This means that all normal output file operations can be carried out
with C<$z>.
For example, to write to a compressed file/buffer you can use either of
these forms
$z->print("hello world\n");
print $z "hello world\n";
The mandatory parameter C<$output> is used to control the destination
of the compressed data. This parameter can take one of these forms.
=over 5
=item A filename
If the C<$output> parameter is a simple scalar, it is assumed to be a
filename. This file will be opened for writing and the compressed data
will be written to it.
=item A filehandle
If the C<$output> parameter is a filehandle, the compressed data will be
written to it.
The string '-' can be used as an alias for standard output.
=item A scalar reference
If C<$output> is a scalar reference, the compressed data will be stored
in C<$$output>.
=back
If the C<$output> parameter is any other type, C<IO::Compress::Zip>::new will
return undef.
=head2 Constructor Options
C<OPTS> is any combination of the following options:
=over 5
=item C<< AutoClose => 0|1 >>
This option is only valid when the C<$output> parameter is a filehandle. If
specified, and the value is true, it will result in the C<$output> being
closed once either the C<close> method is called or the C<IO::Compress::Zip>
object is destroyed.
This parameter defaults to 0.
=item C<< Append => 0|1 >>
Opens C<$output> in append mode.
The behaviour of this option is dependent on the type of C<$output>.
=over 5
=item * A Buffer
If C<$output> is a buffer and C<Append> is enabled, all compressed data
will be append to the end if C<$output>. Otherwise C<$output> will be
cleared before any data is written to it.
=item * A Filename
If C<$output> is a filename and C<Append> is enabled, the file will be
opened in append mode. Otherwise the contents of the file, if any, will be
truncated before any compressed data is written to it.
=item * A Filehandle
If C<$output> is a filehandle, the file pointer will be positioned to the
end of the file via a call to C<seek> before any compressed data is written
to it. Otherwise the file pointer will not be moved.
=back
This parameter defaults to 0.
=item C<< Name => $string >>
Stores the contents of C<$string> in the zip filename header field. If
C<Name> is not specified, no zip filename field will be created.
=item C<< Time => $number >>
Sets the last modified time field in the zip header to $number.
This field defaults to the time the C<IO::Compress::Zip> object was created
if this option is not specified.
=item C<< exTime => [$atime, $mtime, $ctime] >>
This option expects an array reference with exactly three elements:
C<$atime>, C<mtime> and C<$ctime>. These correspond to the last access
time, last modification time and creation time respectively.
It uses these values to set the extended timestamp field in the local zip
header to the three values, $atime, $mtime, $ctime and sets the extended
timestamp field in the central zip header to C<$mtime>.
If the C<Minimal> option is set to true, this option will be ignored.
By default no extended time field is created.
=item C<< Comment => $comment >>
Stores the contents of C<$comment> in the Central File Header of
the zip file.
By default, no comment field is written to the zip file.
=item C<< ZipComment => $comment >>
Stores the contents of C<$comment> in the End of Central Directory record
of the zip file.
By default, no comment field is written to the zip file.
=item C<< 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 C<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 C<IO::Compress::Bzip2> must
be installed. A fatal error will be thrown if you attempt to create Bzip2
content when C<IO::Compress::Bzip2> is not available.
The default method is ZIP_CM_DEFLATE.
=item C<< 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 (C<Stream>
is 0), the output file must be seekable.
The default is 1.
=item C<< 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.
=item C<< ExtraFieldLocal => $data >>
=item C<< ExtraFieldCentral => $data >>
These options allows additional metadata to be stored in the local and
central headers in the zip file/buffer.
An extra field consists of zero or more subfields. Each subfield consists
of a two byte header followed by the subfield data.
The list of subfields can be supplied in any of the following formats
ExtraFieldLocal => [$id1, $data1,
$id2, $data2,
...
]
ExtraFieldLocal => [ [$id1 => $data1],
[$id2 => $data2],
...
]
ExtraFieldLocal => { $id1 => $data1,
$id2 => $data2,
...
}
Where C<$id1>, C<$id2> are two byte subfield ID's.
If you use the hash syntax, you have no control over the order in which
the ExtraSubFields are stored, plus you cannot have SubFields with
duplicate ID.
Alternatively the list of subfields can by supplied as a scalar, thus
ExtraField => $rawdata
If the C<Minimal> option is set to true, this option will be ignored.
The maximum size of an extra field 65535 bytes.
=item C<< Minimal => 1|0 >>
If specified, this option will disable the creation of all extended fields
in the zip local and central headers.
This parameter defaults to 0.
=item C<< 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 C<Method> is ZIP_CM_BZIP2. It is ignored
otherwise.
The default is 1.
=item C<< 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 C<Method> is ZIP_CM_BZIP2. It is ignored
otherwise.
The default is 0.
=item -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 C<IO::Compress::Zip> by default.
use IO::Compress::Zip qw(:strategy);
use IO::Compress::Zip qw(:constants);
use IO::Compress::Zip qw(:all);
=item -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.
=item C<< Strict => 0|1 >>
This is a placeholder option.
=back
=head2 Examples
TODO
=head1 Methods
=head2 print
Usage is
$z->print($data)
print $z $data
Compresses and outputs the contents of the C<$data> parameter. This
has the same behaviour as the C<print> built-in.
Returns true if successful.
=head2 printf
Usage is
$z->printf($format, $data)
printf $z $format, $data
Compresses and outputs the contents of the C<$data> parameter.
Returns true if successful.
=head2 syswrite
Usage is
$z->syswrite $data
$z->syswrite $data, $length
$z->syswrite $data, $length, $offset
Compresses and outputs the contents of the C<$data> parameter.
Returns the number of uncompressed bytes written, or C<undef> if
unsuccessful.
=head2 write
Usage is
$z->write $data
$z->write $data, $length
$z->write $data, $length, $offset
Compresses and outputs the contents of the C<$data> parameter.
Returns the number of uncompressed bytes written, or C<undef> if
unsuccessful.
=head2 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, C<$flush_type>, that controls
how the flushing will be carried out. By default the C<$flush_type>
used is C<Z_FINISH>. Other valid values for C<$flush_type> are
C<Z_NO_FLUSH>, C<Z_SYNC_FLUSH>, C<Z_FULL_FLUSH> and C<Z_BLOCK>. It is
strongly recommended that you only set the C<flush_type> parameter if
you fully understand the implications of what it does - overuse of C<flush>
can seriously degrade the level of compression achieved. See the C<zlib>
documentation for details.
Returns true on success.
=head2 tell
Usage is
$z->tell()
tell $z
Returns the uncompressed file offset.
=head2 eof
Usage is
$z->eof();
eof($z);
Returns true if the C<close> method has been called.
=head2 seek
$z->seek($position, $whence);
seek($z, $position, $whence);
Provides a sub-set of the C<seek> functionality, with the restriction
that it is only legal to seek forward in the output file/buffer.
It is a fatal error to attempt to seek backward.
Empty parts of the file/buffer will have NULL (0x00) bytes written to them.
The C<$whence> parameter takes one the usual values, namely SEEK_SET,
SEEK_CUR or SEEK_END.
Returns 1 on success, 0 on failure.
=head2 binmode
Usage is
$z->binmode
binmode $z ;
This is a noop provided for completeness.
=head2 opened
$z->opened()
Returns true if the object currently refers to a opened file/buffer.
=head2 autoflush
my $prev = $z->autoflush()
my $prev = $z->autoflush(EXPR)
If the C<$z> object is associated with a file or a filehandle, this method
returns the current autoflush setting for the underlying filehandle. If
C<EXPR> is present, and is non-zero, it will enable flushing after every
write/print operation.
If C<$z> is associated with a buffer, this method has no effect and always
returns C<undef>.
B<Note> that the special variable C<$|> B<cannot> be used to set or
retrieve the autoflush setting.
=head2 input_line_number
$z->input_line_number()
$z->input_line_number(EXPR)
This method always returns C<undef> when compressing.
=head2 fileno
$z->fileno()
fileno($z)
If the C<$z> object is associated with a file or a filehandle, this method
will return the underlying file descriptor.
If the C<$z> object is is associated with a buffer, this method will
return undef.
=head2 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::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 C<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 C<close> explicitly and not rely on automatic
closing.
Returns true on success, otherwise 0.
If the C<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.
=head2 newStream([OPTS])
Usage is
$z->newStream( [OPTS] )
Closes the current compressed data stream and starts a new one.
OPTS consists of any of the the options that are available when creating
the C<$z> object.
See the L</"Constructor Options"> section for more details.
=head2 deflateParams
Usage is
$z->deflateParams
TODO
=head1 Importing
A number of symbolic constants are required by some methods in
C<IO::Compress::Zip>. None are imported by default.
=over 5
=item :all
Imports C<zip>, C<$ZipError> and all symbolic
constants that can be used by C<IO::Compress::Zip>. Same as doing this
use IO::Compress::Zip qw(zip $ZipError :constants) ;
=item :constants
Import all symbolic constants. Same as doing this
use IO::Compress::Zip qw(:flush :level :strategy :zip_method) ;
=item :flush
These symbolic constants are used by the C<flush> method.
Z_NO_FLUSH
Z_PARTIAL_FLUSH
Z_SYNC_FLUSH
Z_FULL_FLUSH
Z_FINISH
Z_BLOCK
=item :level
These symbolic constants are used by the C<Level> option in the constructor.
Z_NO_COMPRESSION
Z_BEST_SPEED
Z_BEST_COMPRESSION
Z_DEFAULT_COMPRESSION
=item :strategy
These symbolic constants are used by the C<Strategy> option in the constructor.
Z_FILTERED
Z_HUFFMAN_ONLY
Z_RLE
Z_FIXED
Z_DEFAULT_STRATEGY
=item :zip_method
These symbolic constants are used by the C<Method> option in the
constructor.
ZIP_CM_STORE
ZIP_CM_DEFLATE
ZIP_CM_BZIP2
=back
For
=head1 EXAMPLES
TODO
=head1 SEE ALSO
L<Compress::Zlib>, L<IO::Compress::Gzip>, L<IO::Uncompress::Gunzip>, L<IO::Compress::Deflate>, L<IO::Uncompress::Inflate>, L<IO::Compress::RawDeflate>, L<IO::Uncompress::RawInflate>, L<IO::Compress::Bzip2>, L<IO::Uncompress::Bunzip2>, L<IO::Compress::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Uncompress::AnyInflate>, L<IO::Uncompress::AnyUncompress>
L<Compress::Zlib::FAQ|Compress::Zlib::FAQ>
L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
L<Archive::Tar|Archive::Tar>,
L<IO::Zlib|IO::Zlib>
For RFC 1950, 1951 and 1952 see
F<http://www.faqs.org/rfcs/rfc1950.html>,
F<http://www.faqs.org/rfcs/rfc1951.html> and
F<http://www.faqs.org/rfcs/rfc1952.html>
The I<zlib> compression library was written by Jean-loup Gailly
F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>.
The primary site for the I<zlib> compression library is
F<http://www.zlib.org>.
The primary site for gzip is F<http://www.gzip.org>.
=head1 AUTHOR
This module was written by Paul Marquess, F<pmqs@cpan.org>.
=head1 MODIFICATION HISTORY
See the Changes file.
=head1 COPYRIGHT AND LICENSE
Copyright (c) 2005-2006 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.