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Zlib.pm 0000644 00000125564 15051126444 0006021 0 ustar 00
package Compress::Zlib;
require 5.006 ;
require Exporter;
use Carp ;
use IO::Handle ;
use Scalar::Util qw(dualvar);
use IO::Compress::Base::Common 2.081 ;
use Compress::Raw::Zlib 2.081 ;
use IO::Compress::Gzip 2.081 ;
use IO::Uncompress::Gunzip 2.081 ;
use strict ;
use warnings ;
use bytes ;
our ($VERSION, $XS_VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
$VERSION = '2.081';
$XS_VERSION = $VERSION;
$VERSION = eval $VERSION;
@ISA = qw(Exporter);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
@EXPORT = qw(
deflateInit inflateInit
compress uncompress
gzopen $gzerrno
);
push @EXPORT, @Compress::Raw::Zlib::EXPORT ;
@EXPORT_OK = qw(memGunzip memGzip zlib_version);
%EXPORT_TAGS = (
ALL => \@EXPORT
);
BEGIN
{
*zlib_version = \&Compress::Raw::Zlib::zlib_version;
}
use constant FLAG_APPEND => 1 ;
use constant FLAG_CRC => 2 ;
use constant FLAG_ADLER => 4 ;
use constant FLAG_CONSUME_INPUT => 8 ;
our (@my_z_errmsg);
@my_z_errmsg = (
"need dictionary", # Z_NEED_DICT 2
"stream end", # Z_STREAM_END 1
"", # Z_OK 0
"file error", # Z_ERRNO (-1)
"stream error", # Z_STREAM_ERROR (-2)
"data error", # Z_DATA_ERROR (-3)
"insufficient memory", # Z_MEM_ERROR (-4)
"buffer error", # Z_BUF_ERROR (-5)
"incompatible version",# Z_VERSION_ERROR(-6)
);
sub _set_gzerr
{
my $value = shift ;
if ($value == 0) {
$Compress::Zlib::gzerrno = 0 ;
}
elsif ($value == Z_ERRNO() || $value > 2) {
$Compress::Zlib::gzerrno = $! ;
}
else {
$Compress::Zlib::gzerrno = dualvar($value+0, $my_z_errmsg[2 - $value]);
}
return $value ;
}
sub _set_gzerr_undef
{
_set_gzerr(@_);
return undef;
}
sub _save_gzerr
{
my $gz = shift ;
my $test_eof = shift ;
my $value = $gz->errorNo() || 0 ;
my $eof = $gz->eof() ;
if ($test_eof) {
# gzread uses Z_STREAM_END to denote a successful end
$value = Z_STREAM_END() if $gz->eof() && $value == 0 ;
}
_set_gzerr($value) ;
}
sub gzopen($$)
{
my ($file, $mode) = @_ ;
my $gz ;
my %defOpts = (Level => Z_DEFAULT_COMPRESSION(),
Strategy => Z_DEFAULT_STRATEGY(),
);
my $writing ;
$writing = ! ($mode =~ /r/i) ;
$writing = ($mode =~ /[wa]/i) ;
$defOpts{Level} = $1 if $mode =~ /(\d)/;
$defOpts{Strategy} = Z_FILTERED() if $mode =~ /f/i;
$defOpts{Strategy} = Z_HUFFMAN_ONLY() if $mode =~ /h/i;
$defOpts{Append} = 1 if $mode =~ /a/i;
my $infDef = $writing ? 'deflate' : 'inflate';
my @params = () ;
croak "gzopen: file parameter is not a filehandle or filename"
unless isaFilehandle $file || isaFilename $file ||
(ref $file && ref $file eq 'SCALAR');
return undef unless $mode =~ /[rwa]/i ;
_set_gzerr(0) ;
if ($writing) {
$gz = new IO::Compress::Gzip($file, Minimal => 1, AutoClose => 1,
%defOpts)
or $Compress::Zlib::gzerrno = $IO::Compress::Gzip::GzipError;
}
else {
$gz = new IO::Uncompress::Gunzip($file,
Transparent => 1,
Append => 0,
AutoClose => 1,
MultiStream => 1,
Strict => 0)
or $Compress::Zlib::gzerrno = $IO::Uncompress::Gunzip::GunzipError;
}
return undef
if ! defined $gz ;
bless [$gz, $infDef], 'Compress::Zlib::gzFile';
}
sub Compress::Zlib::gzFile::gzread
{
my $self = shift ;
return _set_gzerr(Z_STREAM_ERROR())
if $self->[1] ne 'inflate';
my $len = defined $_[1] ? $_[1] : 4096 ;
my $gz = $self->[0] ;
if ($self->gzeof() || $len == 0) {
# Zap the output buffer to match ver 1 behaviour.
$_[0] = "" ;
_save_gzerr($gz, 1);
return 0 ;
}
my $status = $gz->read($_[0], $len) ;
_save_gzerr($gz, 1);
return $status ;
}
sub Compress::Zlib::gzFile::gzreadline
{
my $self = shift ;
my $gz = $self->[0] ;
{
# Maintain backward compatibility with 1.x behaviour
# It didn't support $/, so this can't either.
local $/ = "\n" ;
$_[0] = $gz->getline() ;
}
_save_gzerr($gz, 1);
return defined $_[0] ? length $_[0] : 0 ;
}
sub Compress::Zlib::gzFile::gzwrite
{
my $self = shift ;
my $gz = $self->[0] ;
return _set_gzerr(Z_STREAM_ERROR())
if $self->[1] ne 'deflate';
$] >= 5.008 and (utf8::downgrade($_[0], 1)
or croak "Wide character in gzwrite");
my $status = $gz->write($_[0]) ;
_save_gzerr($gz);
return $status ;
}
sub Compress::Zlib::gzFile::gztell
{
my $self = shift ;
my $gz = $self->[0] ;
my $status = $gz->tell() ;
_save_gzerr($gz);
return $status ;
}
sub Compress::Zlib::gzFile::gzseek
{
my $self = shift ;
my $offset = shift ;
my $whence = shift ;
my $gz = $self->[0] ;
my $status ;
eval { $status = $gz->seek($offset, $whence) ; };
if ($@)
{
my $error = $@;
$error =~ s/^.*: /gzseek: /;
$error =~ s/ at .* line \d+\s*$//;
croak $error;
}
_save_gzerr($gz);
return $status ;
}
sub Compress::Zlib::gzFile::gzflush
{
my $self = shift ;
my $f = shift ;
my $gz = $self->[0] ;
my $status = $gz->flush($f) ;
my $err = _save_gzerr($gz);
return $status ? 0 : $err;
}
sub Compress::Zlib::gzFile::gzclose
{
my $self = shift ;
my $gz = $self->[0] ;
my $status = $gz->close() ;
my $err = _save_gzerr($gz);
return $status ? 0 : $err;
}
sub Compress::Zlib::gzFile::gzeof
{
my $self = shift ;
my $gz = $self->[0] ;
return 0
if $self->[1] ne 'inflate';
my $status = $gz->eof() ;
_save_gzerr($gz);
return $status ;
}
sub Compress::Zlib::gzFile::gzsetparams
{
my $self = shift ;
croak "Usage: Compress::Zlib::gzFile::gzsetparams(file, level, strategy)"
unless @_ eq 2 ;
my $gz = $self->[0] ;
my $level = shift ;
my $strategy = shift;
return _set_gzerr(Z_STREAM_ERROR())
if $self->[1] ne 'deflate';
my $status = *$gz->{Compress}->deflateParams(-Level => $level,
-Strategy => $strategy);
_save_gzerr($gz);
return $status ;
}
sub Compress::Zlib::gzFile::gzerror
{
my $self = shift ;
my $gz = $self->[0] ;
return $Compress::Zlib::gzerrno ;
}
sub compress($;$)
{
my ($x, $output, $err, $in) =('', '', '', '') ;
if (ref $_[0] ) {
$in = $_[0] ;
croak "not a scalar reference" unless ref $in eq 'SCALAR' ;
}
else {
$in = \$_[0] ;
}
$] >= 5.008 and (utf8::downgrade($$in, 1)
or croak "Wide character in compress");
my $level = (@_ == 2 ? $_[1] : Z_DEFAULT_COMPRESSION() );
$x = Compress::Raw::Zlib::_deflateInit(FLAG_APPEND,
$level,
Z_DEFLATED,
MAX_WBITS,
MAX_MEM_LEVEL,
Z_DEFAULT_STRATEGY,
4096,
'')
or return undef ;
$err = $x->deflate($in, $output) ;
return undef unless $err == Z_OK() ;
$err = $x->flush($output) ;
return undef unless $err == Z_OK() ;
return $output ;
}
sub uncompress($)
{
my ($output, $in) =('', '') ;
if (ref $_[0] ) {
$in = $_[0] ;
croak "not a scalar reference" unless ref $in eq 'SCALAR' ;
}
else {
$in = \$_[0] ;
}
$] >= 5.008 and (utf8::downgrade($$in, 1)
or croak "Wide character in uncompress");
my ($obj, $status) = Compress::Raw::Zlib::_inflateInit(0,
MAX_WBITS, 4096, "") ;
$status == Z_OK
or return undef;
$obj->inflate($in, $output) == Z_STREAM_END
or return undef;
return $output;
}
sub deflateInit(@)
{
my ($got) = ParseParameters(0,
{
'bufsize' => [IO::Compress::Base::Common::Parse_unsigned, 4096],
'level' => [IO::Compress::Base::Common::Parse_signed, Z_DEFAULT_COMPRESSION()],
'method' => [IO::Compress::Base::Common::Parse_unsigned, Z_DEFLATED()],
'windowbits' => [IO::Compress::Base::Common::Parse_signed, MAX_WBITS()],
'memlevel' => [IO::Compress::Base::Common::Parse_unsigned, MAX_MEM_LEVEL()],
'strategy' => [IO::Compress::Base::Common::Parse_unsigned, Z_DEFAULT_STRATEGY()],
'dictionary' => [IO::Compress::Base::Common::Parse_any, ""],
}, @_ ) ;
croak "Compress::Zlib::deflateInit: Bufsize must be >= 1, you specified " .
$got->getValue('bufsize')
unless $got->getValue('bufsize') >= 1;
my $obj ;
my $status = 0 ;
($obj, $status) =
Compress::Raw::Zlib::_deflateInit(0,
$got->getValue('level'),
$got->getValue('method'),
$got->getValue('windowbits'),
$got->getValue('memlevel'),
$got->getValue('strategy'),
$got->getValue('bufsize'),
$got->getValue('dictionary')) ;
my $x = ($status == Z_OK() ? bless $obj, "Zlib::OldDeflate" : undef) ;
return wantarray ? ($x, $status) : $x ;
}
sub inflateInit(@)
{
my ($got) = ParseParameters(0,
{
'bufsize' => [IO::Compress::Base::Common::Parse_unsigned, 4096],
'windowbits' => [IO::Compress::Base::Common::Parse_signed, MAX_WBITS()],
'dictionary' => [IO::Compress::Base::Common::Parse_any, ""],
}, @_) ;
croak "Compress::Zlib::inflateInit: Bufsize must be >= 1, you specified " .
$got->getValue('bufsize')
unless $got->getValue('bufsize') >= 1;
my $status = 0 ;
my $obj ;
($obj, $status) = Compress::Raw::Zlib::_inflateInit(FLAG_CONSUME_INPUT,
$got->getValue('windowbits'),
$got->getValue('bufsize'),
$got->getValue('dictionary')) ;
my $x = ($status == Z_OK() ? bless $obj, "Zlib::OldInflate" : undef) ;
wantarray ? ($x, $status) : $x ;
}
package Zlib::OldDeflate ;
our (@ISA);
@ISA = qw(Compress::Raw::Zlib::deflateStream);
sub deflate
{
my $self = shift ;
my $output ;
my $status = $self->SUPER::deflate($_[0], $output) ;
wantarray ? ($output, $status) : $output ;
}
sub flush
{
my $self = shift ;
my $output ;
my $flag = shift || Compress::Zlib::Z_FINISH();
my $status = $self->SUPER::flush($output, $flag) ;
wantarray ? ($output, $status) : $output ;
}
package Zlib::OldInflate ;
our (@ISA);
@ISA = qw(Compress::Raw::Zlib::inflateStream);
sub inflate
{
my $self = shift ;
my $output ;
my $status = $self->SUPER::inflate($_[0], $output) ;
wantarray ? ($output, $status) : $output ;
}
package Compress::Zlib ;
use IO::Compress::Gzip::Constants 2.081 ;
sub memGzip($)
{
_set_gzerr(0);
my $x = Compress::Raw::Zlib::_deflateInit(FLAG_APPEND|FLAG_CRC,
Z_BEST_COMPRESSION,
Z_DEFLATED,
-MAX_WBITS(),
MAX_MEM_LEVEL,
Z_DEFAULT_STRATEGY,
4096,
'')
or return undef ;
# if the deflation buffer isn't a reference, make it one
my $string = (ref $_[0] ? $_[0] : \$_[0]) ;
$] >= 5.008 and (utf8::downgrade($$string, 1)
or croak "Wide character in memGzip");
my $out;
my $status ;
$x->deflate($string, $out) == Z_OK
or return undef ;
$x->flush($out) == Z_OK
or return undef ;
return IO::Compress::Gzip::Constants::GZIP_MINIMUM_HEADER .
$out .
pack("V V", $x->crc32(), $x->total_in());
}
sub _removeGzipHeader($)
{
my $string = shift ;
return Z_DATA_ERROR()
if length($$string) < GZIP_MIN_HEADER_SIZE ;
my ($magic1, $magic2, $method, $flags, $time, $xflags, $oscode) =
unpack ('CCCCVCC', $$string);
return Z_DATA_ERROR()
unless $magic1 == GZIP_ID1 and $magic2 == GZIP_ID2 and
$method == Z_DEFLATED() and !($flags & GZIP_FLG_RESERVED) ;
substr($$string, 0, GZIP_MIN_HEADER_SIZE) = '' ;
# skip extra field
if ($flags & GZIP_FLG_FEXTRA)
{
return Z_DATA_ERROR()
if length($$string) < GZIP_FEXTRA_HEADER_SIZE ;
my ($extra_len) = unpack ('v', $$string);
$extra_len += GZIP_FEXTRA_HEADER_SIZE;
return Z_DATA_ERROR()
if length($$string) < $extra_len ;
substr($$string, 0, $extra_len) = '';
}
# skip orig name
if ($flags & GZIP_FLG_FNAME)
{
my $name_end = index ($$string, GZIP_NULL_BYTE);
return Z_DATA_ERROR()
if $name_end == -1 ;
substr($$string, 0, $name_end + 1) = '';
}
# skip comment
if ($flags & GZIP_FLG_FCOMMENT)
{
my $comment_end = index ($$string, GZIP_NULL_BYTE);
return Z_DATA_ERROR()
if $comment_end == -1 ;
substr($$string, 0, $comment_end + 1) = '';
}
# skip header crc
if ($flags & GZIP_FLG_FHCRC)
{
return Z_DATA_ERROR()
if length ($$string) < GZIP_FHCRC_SIZE ;
substr($$string, 0, GZIP_FHCRC_SIZE) = '';
}
return Z_OK();
}
sub _ret_gun_error
{
$Compress::Zlib::gzerrno = $IO::Uncompress::Gunzip::GunzipError;
return undef;
}
sub memGunzip($)
{
# if the buffer isn't a reference, make it one
my $string = (ref $_[0] ? $_[0] : \$_[0]);
$] >= 5.008 and (utf8::downgrade($$string, 1)
or croak "Wide character in memGunzip");
_set_gzerr(0);
my $status = _removeGzipHeader($string) ;
$status == Z_OK()
or return _set_gzerr_undef($status);
my $bufsize = length $$string > 4096 ? length $$string : 4096 ;
my $x = Compress::Raw::Zlib::_inflateInit(FLAG_CRC | FLAG_CONSUME_INPUT,
-MAX_WBITS(), $bufsize, '')
or return _ret_gun_error();
my $output = '' ;
$status = $x->inflate($string, $output);
if ( $status == Z_OK() )
{
_set_gzerr(Z_DATA_ERROR());
return undef;
}
return _ret_gun_error()
if ($status != Z_STREAM_END());
if (length $$string >= 8)
{
my ($crc, $len) = unpack ("VV", substr($$string, 0, 8));
substr($$string, 0, 8) = '';
return _set_gzerr_undef(Z_DATA_ERROR())
unless $len == length($output) and
$crc == Compress::Raw::Zlib::crc32($output);
}
else
{
$$string = '';
}
return $output;
}
# Autoload methods go after __END__, and are processed by the autosplit program.
1;
__END__
=head1 NAME
Compress::Zlib - Interface to zlib compression library
=head1 SYNOPSIS
use Compress::Zlib ;
($d, $status) = deflateInit( [OPT] ) ;
$status = $d->deflate($input, $output) ;
$status = $d->flush([$flush_type]) ;
$d->deflateParams(OPTS) ;
$d->deflateTune(OPTS) ;
$d->dict_adler() ;
$d->crc32() ;
$d->adler32() ;
$d->total_in() ;
$d->total_out() ;
$d->msg() ;
$d->get_Strategy();
$d->get_Level();
$d->get_BufSize();
($i, $status) = inflateInit( [OPT] ) ;
$status = $i->inflate($input, $output [, $eof]) ;
$status = $i->inflateSync($input) ;
$i->dict_adler() ;
$d->crc32() ;
$d->adler32() ;
$i->total_in() ;
$i->total_out() ;
$i->msg() ;
$d->get_BufSize();
$dest = compress($source) ;
$dest = uncompress($source) ;
$gz = gzopen($filename or filehandle, $mode) ;
$bytesread = $gz->gzread($buffer [,$size]) ;
$bytesread = $gz->gzreadline($line) ;
$byteswritten = $gz->gzwrite($buffer) ;
$status = $gz->gzflush($flush) ;
$offset = $gz->gztell() ;
$status = $gz->gzseek($offset, $whence) ;
$status = $gz->gzclose() ;
$status = $gz->gzeof() ;
$status = $gz->gzsetparams($level, $strategy) ;
$errstring = $gz->gzerror() ;
$gzerrno
$dest = Compress::Zlib::memGzip($buffer) ;
$dest = Compress::Zlib::memGunzip($buffer) ;
$crc = adler32($buffer [,$crc]) ;
$crc = crc32($buffer [,$crc]) ;
$crc = crc32_combine($crc1, $crc2, $len2);
$adler = adler32_combine($adler1, $adler2, $len2);
my $version = Compress::Raw::Zlib::zlib_version();
=head1 DESCRIPTION
The I<Compress::Zlib> module provides a Perl interface to the I<zlib>
compression library (see L</AUTHOR> for details about where to get
I<zlib>).
The C<Compress::Zlib> module can be split into two general areas of
functionality, namely a simple read/write interface to I<gzip> files
and a low-level in-memory compression/decompression interface.
Each of these areas will be discussed in the following sections.
=head2 Notes for users of Compress::Zlib version 1
The main change in C<Compress::Zlib> version 2.x is that it does not now
interface directly to the zlib library. Instead it uses the
C<IO::Compress::Gzip> and C<IO::Uncompress::Gunzip> modules for
reading/writing gzip files, and the C<Compress::Raw::Zlib> module for some
low-level zlib access.
The interface provided by version 2 of this module should be 100% backward
compatible with version 1. If you find a difference in the expected
behaviour please contact the author (See L</AUTHOR>). See L<GZIP INTERFACE>
With the creation of the C<IO::Compress> and C<IO::Uncompress> modules no
new features are planned for C<Compress::Zlib> - the new modules do
everything that C<Compress::Zlib> does and then some. Development on
C<Compress::Zlib> will be limited to bug fixes only.
If you are writing new code, your first port of call should be one of the
new C<IO::Compress> or C<IO::Uncompress> modules.
=head1 GZIP INTERFACE
A number of functions are supplied in I<zlib> for reading and writing
I<gzip> files that conform to RFC 1952. This module provides an interface
to most of them.
If you have previously used C<Compress::Zlib> 1.x, the following
enhancements/changes have been made to the C<gzopen> interface:
=over 5
=item 1
If you want to open either STDIN or STDOUT with C<gzopen>, you can now
optionally use the special filename "C<->" as a synonym for C<\*STDIN> and
C<\*STDOUT>.
=item 2
In C<Compress::Zlib> version 1.x, C<gzopen> used the zlib library to open
the underlying file. This made things especially tricky when a Perl
filehandle was passed to C<gzopen>. Behind the scenes the numeric C file
descriptor had to be extracted from the Perl filehandle and this passed to
the zlib library.
Apart from being non-portable to some operating systems, this made it
difficult to use C<gzopen> in situations where you wanted to extract/create
a gzip data stream that is embedded in a larger file, without having to
resort to opening and closing the file multiple times.
It also made it impossible to pass a perl filehandle that wasn't associated
with a real filesystem file, like, say, an C<IO::String>.
In C<Compress::Zlib> version 2.x, the C<gzopen> interface has been
completely rewritten to use the L<IO::Compress::Gzip|IO::Compress::Gzip>
for writing gzip files and L<IO::Uncompress::Gunzip|IO::Uncompress::Gunzip>
for reading gzip files. None of the limitations mentioned above apply.
=item 3
Addition of C<gzseek> to provide a restricted C<seek> interface.
=item 4.
Added C<gztell>.
=back
A more complete and flexible interface for reading/writing gzip
files/buffers is included with the module C<IO-Compress-Zlib>. See
L<IO::Compress::Gzip|IO::Compress::Gzip> and
L<IO::Uncompress::Gunzip|IO::Uncompress::Gunzip> for more details.
=over 5
=item B<$gz = gzopen($filename, $mode)>
=item B<$gz = gzopen($filehandle, $mode)>
This function opens either the I<gzip> file C<$filename> for reading or
writing or attaches to the opened filehandle, C<$filehandle>.
It returns an object on success and C<undef> on failure.
When writing a gzip file this interface will I<always> create the smallest
possible gzip header (exactly 10 bytes). If you want greater control over
what gets stored in the gzip header (like the original filename or a
comment) use L<IO::Compress::Gzip|IO::Compress::Gzip> instead. Similarly if
you want to read the contents of the gzip header use
L<IO::Uncompress::Gunzip|IO::Uncompress::Gunzip>.
The second parameter, C<$mode>, is used to specify whether the file is
opened for reading or writing and to optionally specify a compression
level and compression strategy when writing. The format of the C<$mode>
parameter is similar to the mode parameter to the 'C' function C<fopen>,
so "rb" is used to open for reading, "wb" for writing and "ab" for
appending (writing at the end of the file).
To specify a compression level when writing, append a digit between 0
and 9 to the mode string -- 0 means no compression and 9 means maximum
compression.
If no compression level is specified Z_DEFAULT_COMPRESSION is used.
To specify the compression strategy when writing, append 'f' for filtered
data, 'h' for Huffman only compression, or 'R' for run-length encoding.
If no strategy is specified Z_DEFAULT_STRATEGY is used.
So, for example, "wb9" means open for writing with the maximum compression
using the default strategy and "wb4R" means open for writing with compression
level 4 and run-length encoding.
Refer to the I<zlib> documentation for the exact format of the C<$mode>
parameter.
=item B<$bytesread = $gz-E<gt>gzread($buffer [, $size]) ;>
Reads C<$size> bytes from the compressed file into C<$buffer>. If
C<$size> is not specified, it will default to 4096. If the scalar
C<$buffer> is not large enough, it will be extended automatically.
Returns the number of bytes actually read. On EOF it returns 0 and in
the case of an error, -1.
=item B<$bytesread = $gz-E<gt>gzreadline($line) ;>
Reads the next line from the compressed file into C<$line>.
Returns the number of bytes actually read. On EOF it returns 0 and in
the case of an error, -1.
It is legal to intermix calls to C<gzread> and C<gzreadline>.
To maintain backward compatibility with version 1.x of this module
C<gzreadline> ignores the C<$/> variable - it I<always> uses the string
C<"\n"> as the line delimiter.
If you want to read a gzip file a line at a time and have it respect the
C<$/> variable (or C<$INPUT_RECORD_SEPARATOR>, or C<$RS> when C<English> is
in use) see L<IO::Uncompress::Gunzip|IO::Uncompress::Gunzip>.
=item B<$byteswritten = $gz-E<gt>gzwrite($buffer) ;>
Writes the contents of C<$buffer> to the compressed file. Returns the
number of bytes actually written, or 0 on error.
=item B<$status = $gz-E<gt>gzflush($flush_type) ;>
Flushes all pending output into the compressed file.
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<$flush_type> are
C<Z_NO_FLUSH>, C<Z_SYNC_FLUSH>, C<Z_FULL_FLUSH> and C<Z_BLOCK>. It is
strongly recommended that you only set the C<flush_type> parameter if
you fully understand the implications of what it does - overuse of C<flush>
can seriously degrade the level of compression achieved. See the C<zlib>
documentation for details.
Returns 0 on success.
=item B<$offset = $gz-E<gt>gztell() ;>
Returns the uncompressed file offset.
=item B<$status = $gz-E<gt>gzseek($offset, $whence) ;>
Provides a sub-set of the C<seek> functionality, with the restriction
that it is only legal to seek forward in the compressed file.
It is a fatal error to attempt to seek backward.
When opened for writing, empty parts of the file will have NULL (0x00)
bytes written to them.
The C<$whence> parameter should be one of SEEK_SET, SEEK_CUR or SEEK_END.
Returns 1 on success, 0 on failure.
=item B<$gz-E<gt>gzclose>
Closes the compressed file. Any pending data is flushed to the file
before it is closed.
Returns 0 on success.
=item B<$gz-E<gt>gzsetparams($level, $strategy>
Change settings for the deflate stream C<$gz>.
The list of the valid options is shown below. Options not specified
will remain unchanged.
Note: This method is only available if you are running zlib 1.0.6 or better.
=over 5
=item B<$level>
Defines the compression level. Valid values are 0 through 9,
C<Z_NO_COMPRESSION>, C<Z_BEST_SPEED>, C<Z_BEST_COMPRESSION>, and
C<Z_DEFAULT_COMPRESSION>.
=item B<$strategy>
Defines the strategy used to tune the compression. The valid values are
C<Z_DEFAULT_STRATEGY>, C<Z_FILTERED> and C<Z_HUFFMAN_ONLY>.
=back
=item B<$gz-E<gt>gzerror>
Returns the I<zlib> error message or number for the last operation
associated with C<$gz>. The return value will be the I<zlib> error
number when used in a numeric context and the I<zlib> error message
when used in a string context. The I<zlib> error number constants,
shown below, are available for use.
Z_OK
Z_STREAM_END
Z_ERRNO
Z_STREAM_ERROR
Z_DATA_ERROR
Z_MEM_ERROR
Z_BUF_ERROR
=item B<$gzerrno>
The C<$gzerrno> scalar holds the error code associated with the most
recent I<gzip> routine. Note that unlike C<gzerror()>, the error is
I<not> associated with a particular file.
As with C<gzerror()> it returns an error number in numeric context and
an error message in string context. Unlike C<gzerror()> though, the
error message will correspond to the I<zlib> message when the error is
associated with I<zlib> itself, or the UNIX error message when it is
not (i.e. I<zlib> returned C<Z_ERRORNO>).
As there is an overlap between the error numbers used by I<zlib> and
UNIX, C<$gzerrno> should only be used to check for the presence of
I<an> error in numeric context. Use C<gzerror()> to check for specific
I<zlib> errors. The I<gzcat> example below shows how the variable can
be used safely.
=back
=head2 Examples
Here is an example script which uses the interface. It implements a
I<gzcat> function.
use strict ;
use warnings ;
use Compress::Zlib ;
# use stdin if no files supplied
@ARGV = '-' unless @ARGV ;
foreach my $file (@ARGV) {
my $buffer ;
my $gz = gzopen($file, "rb")
or die "Cannot open $file: $gzerrno\n" ;
print $buffer while $gz->gzread($buffer) > 0 ;
die "Error reading from $file: $gzerrno" . ($gzerrno+0) . "\n"
if $gzerrno != Z_STREAM_END ;
$gz->gzclose() ;
}
Below is a script which makes use of C<gzreadline>. It implements a
very simple I<grep> like script.
use strict ;
use warnings ;
use Compress::Zlib ;
die "Usage: gzgrep pattern [file...]\n"
unless @ARGV >= 1;
my $pattern = shift ;
# use stdin if no files supplied
@ARGV = '-' unless @ARGV ;
foreach my $file (@ARGV) {
my $gz = gzopen($file, "rb")
or die "Cannot open $file: $gzerrno\n" ;
while ($gz->gzreadline($_) > 0) {
print if /$pattern/ ;
}
die "Error reading from $file: $gzerrno\n"
if $gzerrno != Z_STREAM_END ;
$gz->gzclose() ;
}
This script, I<gzstream>, does the opposite of the I<gzcat> script
above. It reads from standard input and writes a gzip data stream to
standard output.
use strict ;
use warnings ;
use Compress::Zlib ;
binmode STDOUT; # gzopen only sets it on the fd
my $gz = gzopen(\*STDOUT, "wb")
or die "Cannot open stdout: $gzerrno\n" ;
while (<>) {
$gz->gzwrite($_)
or die "error writing: $gzerrno\n" ;
}
$gz->gzclose ;
=head2 Compress::Zlib::memGzip
This function is used to create an in-memory gzip file with the minimum
possible gzip header (exactly 10 bytes).
$dest = Compress::Zlib::memGzip($buffer)
or die "Cannot compress: $gzerrno\n";
If successful, it returns the in-memory gzip file. Otherwise it returns
C<undef> and the C<$gzerrno> variable will store the zlib error code.
The C<$buffer> parameter can either be a scalar or a scalar reference.
See L<IO::Compress::Gzip|IO::Compress::Gzip> for an alternative way to
carry out in-memory gzip compression.
=head2 Compress::Zlib::memGunzip
This function is used to uncompress an in-memory gzip file.
$dest = Compress::Zlib::memGunzip($buffer)
or die "Cannot uncompress: $gzerrno\n";
If successful, it returns the uncompressed gzip file. Otherwise it
returns C<undef> and the C<$gzerrno> variable will store the zlib error
code.
The C<$buffer> parameter can either be a scalar or a scalar reference. The
contents of the C<$buffer> parameter are destroyed after calling this function.
If C<$buffer> consists of multiple concatenated gzip data streams only the
first will be uncompressed. Use C<gunzip> with the C<MultiStream> option in
the C<IO::Uncompress::Gunzip> module if you need to deal with concatenated
data streams.
See L<IO::Uncompress::Gunzip|IO::Uncompress::Gunzip> for an alternative way
to carry out in-memory gzip uncompression.
=head1 COMPRESS/UNCOMPRESS
Two functions are provided to perform in-memory compression/uncompression of
RFC 1950 data streams. They are called C<compress> and C<uncompress>.
=over 5
=item B<$dest = compress($source [, $level] ) ;>
Compresses C<$source>. If successful it returns the compressed
data. Otherwise it returns I<undef>.
The source buffer, C<$source>, can either be a scalar or a scalar
reference.
The C<$level> parameter defines the compression level. Valid values are
0 through 9, C<Z_NO_COMPRESSION>, C<Z_BEST_SPEED>,
C<Z_BEST_COMPRESSION>, and C<Z_DEFAULT_COMPRESSION>.
If C<$level> is not specified C<Z_DEFAULT_COMPRESSION> will be used.
=item B<$dest = uncompress($source) ;>
Uncompresses C<$source>. If successful it returns the uncompressed
data. Otherwise it returns I<undef>.
The source buffer can either be a scalar or a scalar reference.
=back
Please note: the two functions defined above are I<not> compatible with
the Unix commands of the same name.
See L<IO::Deflate|IO::Deflate> and L<IO::Inflate|IO::Inflate> included with
this distribution for an alternative interface for reading/writing RFC 1950
files/buffers.
=head1 Deflate Interface
This section defines an interface that allows in-memory compression using
the I<deflate> interface provided by zlib.
Here is a definition of the interface available:
=head2 B<($d, $status) = deflateInit( [OPT] )>
Initialises a deflation stream.
It combines the features of the I<zlib> functions C<deflateInit>,
C<deflateInit2> and C<deflateSetDictionary>.
If successful, it will return the initialised deflation stream, C<$d>
and C<$status> of C<Z_OK> in a list context. In scalar context it
returns the deflation stream, C<$d>, only.
If not successful, the returned deflation stream (C<$d>) will be
I<undef> and C<$status> will hold the exact I<zlib> error code.
The function optionally takes a number of named options specified as
C<< -Name=>value >> pairs. This allows individual options to be
tailored without having to specify them all in the parameter list.
For backward compatibility, it is also possible to pass the parameters
as a reference to a hash containing the name=>value pairs.
The function takes one optional parameter, a reference to a hash. The
contents of the hash allow the deflation interface to be tailored.
Here is a list of the valid options:
=over 5
=item B<-Level>
Defines the compression level. Valid values are 0 through 9,
C<Z_NO_COMPRESSION>, C<Z_BEST_SPEED>, C<Z_BEST_COMPRESSION>, and
C<Z_DEFAULT_COMPRESSION>.
The default is Z_DEFAULT_COMPRESSION.
=item B<-Method>
Defines the compression method. The only valid value at present (and
the default) is Z_DEFLATED.
=item B<-WindowBits>
To create an RFC 1950 data stream, set C<WindowBits> to a positive number.
To create an RFC 1951 data stream, set C<WindowBits> to C<-MAX_WBITS>.
For a full definition of the meaning and valid values for C<WindowBits> refer
to the I<zlib> documentation for I<deflateInit2>.
Defaults to MAX_WBITS.
=item B<-MemLevel>
For a definition of the meaning and valid values for C<MemLevel>
refer to the I<zlib> documentation for I<deflateInit2>.
Defaults to MAX_MEM_LEVEL.
=item B<-Strategy>
Defines the strategy used to tune the compression. The valid values are
C<Z_DEFAULT_STRATEGY>, C<Z_FILTERED> and C<Z_HUFFMAN_ONLY>.
The default is Z_DEFAULT_STRATEGY.
=item B<-Dictionary>
When a dictionary is specified I<Compress::Zlib> will automatically
call C<deflateSetDictionary> directly after calling C<deflateInit>. The
Adler32 value for the dictionary can be obtained by calling the method
C<$d->dict_adler()>.
The default is no dictionary.
=item B<-Bufsize>
Sets the initial size for the deflation buffer. If the buffer has to be
reallocated to increase the size, it will grow in increments of
C<Bufsize>.
The default is 4096.
=back
Here is an example of using the C<deflateInit> optional parameter list
to override the default buffer size and compression level. All other
options will take their default values.
deflateInit( -Bufsize => 300,
-Level => Z_BEST_SPEED ) ;
=head2 B<($out, $status) = $d-E<gt>deflate($buffer)>
Deflates the contents of C<$buffer>. The buffer can either be a scalar
or a scalar reference. When finished, C<$buffer> will be
completely processed (assuming there were no errors). If the deflation
was successful it returns the deflated output, C<$out>, and a status
value, C<$status>, of C<Z_OK>.
On error, C<$out> will be I<undef> and C<$status> will contain the
I<zlib> error code.
In a scalar context C<deflate> will return C<$out> only.
As with the I<deflate> function in I<zlib>, it is not necessarily the
case that any output will be produced by this method. So don't rely on
the fact that C<$out> is empty for an error test.
=head2 B<($out, $status) = $d-E<gt>flush()>
=head2 B<($out, $status) = $d-E<gt>flush($flush_type)>
Typically used to finish the deflation. Any pending output will be
returned via C<$out>.
C<$status> will have a value C<Z_OK> if successful.
In a scalar context C<flush> will return C<$out> only.
Note that flushing can seriously degrade the compression ratio, so it
should only be used to terminate a decompression (using C<Z_FINISH>) or
when you want to create a I<full flush point> (using C<Z_FULL_FLUSH>).
By default the C<flush_type> used is C<Z_FINISH>. Other valid values
for C<flush_type> are C<Z_NO_FLUSH>, C<Z_PARTIAL_FLUSH>, C<Z_SYNC_FLUSH>
and C<Z_FULL_FLUSH>. It is strongly recommended that you only set the
C<flush_type> parameter if you fully understand the implications of
what it does. See the C<zlib> documentation for details.
=head2 B<$status = $d-E<gt>deflateParams([OPT])>
Change settings for the deflate stream C<$d>.
The list of the valid options is shown below. Options not specified
will remain unchanged.
=over 5
=item B<-Level>
Defines the compression level. Valid values are 0 through 9,
C<Z_NO_COMPRESSION>, C<Z_BEST_SPEED>, C<Z_BEST_COMPRESSION>, and
C<Z_DEFAULT_COMPRESSION>.
=item B<-Strategy>
Defines the strategy used to tune the compression. The valid values are
C<Z_DEFAULT_STRATEGY>, C<Z_FILTERED> and C<Z_HUFFMAN_ONLY>.
=back
=head2 B<$d-E<gt>dict_adler()>
Returns the adler32 value for the dictionary.
=head2 B<$d-E<gt>msg()>
Returns the last error message generated by zlib.
=head2 B<$d-E<gt>total_in()>
Returns the total number of bytes uncompressed bytes input to deflate.
=head2 B<$d-E<gt>total_out()>
Returns the total number of compressed bytes output from deflate.
=head2 Example
Here is a trivial example of using C<deflate>. It simply reads standard
input, deflates it and writes it to standard output.
use strict ;
use warnings ;
use Compress::Zlib ;
binmode STDIN;
binmode STDOUT;
my $x = deflateInit()
or die "Cannot create a deflation stream\n" ;
my ($output, $status) ;
while (<>)
{
($output, $status) = $x->deflate($_) ;
$status == Z_OK
or die "deflation failed\n" ;
print $output ;
}
($output, $status) = $x->flush() ;
$status == Z_OK
or die "deflation failed\n" ;
print $output ;
=head1 Inflate Interface
This section defines the interface available that allows in-memory
uncompression using the I<deflate> interface provided by zlib.
Here is a definition of the interface:
=head2 B<($i, $status) = inflateInit()>
Initialises an inflation stream.
In a list context it returns the inflation stream, C<$i>, and the
I<zlib> status code in C<$status>. In a scalar context it returns the
inflation stream only.
If successful, C<$i> will hold the inflation stream and C<$status> will
be C<Z_OK>.
If not successful, C<$i> will be I<undef> and C<$status> will hold the
I<zlib> error code.
The function optionally takes a number of named options specified as
C<< -Name=>value >> pairs. This allows individual options to be
tailored without having to specify them all in the parameter list.
For backward compatibility, it is also possible to pass the parameters
as a reference to a hash containing the name=>value pairs.
The function takes one optional parameter, a reference to a hash. The
contents of the hash allow the deflation interface to be tailored.
Here is a list of the valid options:
=over 5
=item B<-WindowBits>
To uncompress an RFC 1950 data stream, set C<WindowBits> to a positive number.
To uncompress an RFC 1951 data stream, set C<WindowBits> to C<-MAX_WBITS>.
For a full definition of the meaning and valid values for C<WindowBits> refer
to the I<zlib> documentation for I<inflateInit2>.
Defaults to MAX_WBITS.
=item B<-Bufsize>
Sets the initial size for the inflation buffer. If the buffer has to be
reallocated to increase the size, it will grow in increments of
C<Bufsize>.
Default is 4096.
=item B<-Dictionary>
The default is no dictionary.
=back
Here is an example of using the C<inflateInit> optional parameter to
override the default buffer size.
inflateInit( -Bufsize => 300 ) ;
=head2 B<($out, $status) = $i-E<gt>inflate($buffer)>
Inflates the complete contents of C<$buffer>. The buffer can either be
a scalar or a scalar reference.
Returns C<Z_OK> if successful and C<Z_STREAM_END> if the end of the
compressed data has been successfully reached.
If not successful, C<$out> will be I<undef> and C<$status> will hold
the I<zlib> error code.
The C<$buffer> parameter is modified by C<inflate>. On completion it
will contain what remains of the input buffer after inflation. This
means that C<$buffer> will be an empty string when the return status is
C<Z_OK>. When the return status is C<Z_STREAM_END> the C<$buffer>
parameter will contains what (if anything) was stored in the input
buffer after the deflated data stream.
This feature is useful when processing a file format that encapsulates
a compressed data stream (e.g. gzip, zip).
=head2 B<$status = $i-E<gt>inflateSync($buffer)>
Scans C<$buffer> until it reaches either a I<full flush point> or the
end of the buffer.
If a I<full flush point> is found, C<Z_OK> is returned and C<$buffer>
will be have all data up to the flush point removed. This can then be
passed to the C<deflate> method.
Any other return code means that a flush point was not found. If more
data is available, C<inflateSync> can be called repeatedly with more
compressed data until the flush point is found.
=head2 B<$i-E<gt>dict_adler()>
Returns the adler32 value for the dictionary.
=head2 B<$i-E<gt>msg()>
Returns the last error message generated by zlib.
=head2 B<$i-E<gt>total_in()>
Returns the total number of bytes compressed bytes input to inflate.
=head2 B<$i-E<gt>total_out()>
Returns the total number of uncompressed bytes output from inflate.
=head2 Example
Here is an example of using C<inflate>.
use strict ;
use warnings ;
use Compress::Zlib ;
my $x = inflateInit()
or die "Cannot create a inflation stream\n" ;
my $input = '' ;
binmode STDIN;
binmode STDOUT;
my ($output, $status) ;
while (read(STDIN, $input, 4096))
{
($output, $status) = $x->inflate(\$input) ;
print $output
if $status == Z_OK or $status == Z_STREAM_END ;
last if $status != Z_OK ;
}
die "inflation failed\n"
unless $status == Z_STREAM_END ;
=head1 CHECKSUM FUNCTIONS
Two functions are provided by I<zlib> to calculate checksums. For the
Perl interface, the order of the two parameters in both functions has
been reversed. This allows both running checksums and one off
calculations to be done.
$crc = adler32($buffer [,$crc]) ;
$crc = crc32($buffer [,$crc]) ;
The buffer parameters can either be a scalar or a scalar reference.
If the $crc parameters is C<undef>, the crc value will be reset.
If you have built this module with zlib 1.2.3 or better, two more
CRC-related functions are available.
$crc = crc32_combine($crc1, $crc2, $len2);
$adler = adler32_combine($adler1, $adler2, $len2);
These functions allow checksums to be merged.
Refer to the I<zlib> documentation for more details.
=head1 Misc
=head2 my $version = Compress::Zlib::zlib_version();
Returns the version of the zlib library.
=head1 CONSTANTS
All the I<zlib> constants are automatically imported when you make use
of I<Compress::Zlib>.
=head1 SEE ALSO
L<IO::Compress::Gzip>, L<IO::Uncompress::Gunzip>, L<IO::Compress::Deflate>, L<IO::Uncompress::Inflate>, L<IO::Compress::RawDeflate>, L<IO::Uncompress::RawInflate>, L<IO::Compress::Bzip2>, L<IO::Uncompress::Bunzip2>, L<IO::Compress::Lzma>, L<IO::Uncompress::UnLzma>, L<IO::Compress::Xz>, L<IO::Uncompress::UnXz>, L<IO::Compress::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Compress::Lzf>, L<IO::Uncompress::UnLzf>, L<IO::Uncompress::AnyInflate>, L<IO::Uncompress::AnyUncompress>
L<IO::Compress::FAQ|IO::Compress::FAQ>
L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
L<Archive::Tar|Archive::Tar>,
L<IO::Zlib|IO::Zlib>
For RFC 1950, 1951 and 1952 see
L<http://www.faqs.org/rfcs/rfc1950.html>,
L<http://www.faqs.org/rfcs/rfc1951.html> and
L<http://www.faqs.org/rfcs/rfc1952.html>
The I<zlib> compression library was written by Jean-loup Gailly
C<gzip@prep.ai.mit.edu> and Mark Adler C<madler@alumni.caltech.edu>.
The primary site for the I<zlib> compression library is
L<http://www.zlib.org>.
The primary site for gzip is L<http://www.gzip.org>.
=head1 AUTHOR
This module was written by Paul Marquess, C<pmqs@cpan.org>.
=head1 MODIFICATION HISTORY
See the Changes file.
=head1 COPYRIGHT AND LICENSE
Copyright (c) 1995-2018 Paul Marquess. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
RawDeflate.pm 0000644 00000062314 15051134574 0007133 0 ustar 00 package IO::Compress::RawDeflate ;
# create RFC1951
#
use strict ;
use warnings;
use bytes;
use IO::Compress::Base 2.081 ;
use IO::Compress::Base::Common 2.081 qw(:Status );
use IO::Compress::Adapter::Deflate 2.081 ;
require Exporter ;
our ($VERSION, @ISA, @EXPORT_OK, %DEFLATE_CONSTANTS, %EXPORT_TAGS, $RawDeflateError);
$VERSION = '2.081';
$RawDeflateError = '';
@ISA = qw(IO::Compress::Base Exporter);
@EXPORT_OK = qw( $RawDeflateError rawdeflate ) ;
push @EXPORT_OK, @IO::Compress::Adapter::Deflate::EXPORT_OK ;
%EXPORT_TAGS = %IO::Compress::Adapter::Deflate::DEFLATE_CONSTANTS;
{
my %seen;
foreach (keys %EXPORT_TAGS )
{
push @{$EXPORT_TAGS{constants}},
grep { !$seen{$_}++ }
@{ $EXPORT_TAGS{$_} }
}
$EXPORT_TAGS{all} = $EXPORT_TAGS{constants} ;
}
%DEFLATE_CONSTANTS = %EXPORT_TAGS;
#push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ;
Exporter::export_ok_tags('all');
sub new
{
my $class = shift ;
my $obj = IO::Compress::Base::Common::createSelfTiedObject($class, \$RawDeflateError);
return $obj->_create(undef, @_);
}
sub rawdeflate
{
my $obj = IO::Compress::Base::Common::createSelfTiedObject(undef, \$RawDeflateError);
return $obj->_def(@_);
}
sub ckParams
{
my $self = shift ;
my $got = shift;
return 1 ;
}
sub mkComp
{
my $self = shift ;
my $got = shift ;
my ($obj, $errstr, $errno) = IO::Compress::Adapter::Deflate::mkCompObject(
$got->getValue('crc32'),
$got->getValue('adler32'),
$got->getValue('level'),
$got->getValue('strategy')
);
return $self->saveErrorString(undef, $errstr, $errno)
if ! defined $obj;
return $obj;
}
sub mkHeader
{
my $self = shift ;
return '';
}
sub mkTrailer
{
my $self = shift ;
return '';
}
sub mkFinalTrailer
{
return '';
}
#sub newHeader
#{
# my $self = shift ;
# return '';
#}
sub getExtraParams
{
my $self = shift ;
return getZlibParams();
}
use IO::Compress::Base::Common 2.081 qw(:Parse);
use Compress::Raw::Zlib 2.081 qw(Z_DEFLATED Z_DEFAULT_COMPRESSION Z_DEFAULT_STRATEGY);
our %PARAMS = (
#'method' => [IO::Compress::Base::Common::Parse_unsigned, Z_DEFLATED],
'level' => [IO::Compress::Base::Common::Parse_signed, Z_DEFAULT_COMPRESSION],
'strategy' => [IO::Compress::Base::Common::Parse_signed, Z_DEFAULT_STRATEGY],
'crc32' => [IO::Compress::Base::Common::Parse_boolean, 0],
'adler32' => [IO::Compress::Base::Common::Parse_boolean, 0],
'merge' => [IO::Compress::Base::Common::Parse_boolean, 0],
);
sub getZlibParams
{
return %PARAMS;
}
sub getInverseClass
{
return ('IO::Uncompress::RawInflate',
\$IO::Uncompress::RawInflate::RawInflateError);
}
sub getFileInfo
{
my $self = shift ;
my $params = shift;
my $file = shift ;
}
use Fcntl qw(SEEK_SET);
sub createMerge
{
my $self = shift ;
my $outValue = shift ;
my $outType = shift ;
my ($invClass, $error_ref) = $self->getInverseClass();
eval "require $invClass"
or die "aaaahhhh" ;
my $inf = $invClass->new( $outValue,
Transparent => 0,
#Strict => 1,
AutoClose => 0,
Scan => 1)
or return $self->saveErrorString(undef, "Cannot create InflateScan object: $$error_ref" ) ;
my $end_offset = 0;
$inf->scan()
or return $self->saveErrorString(undef, "Error Scanning: $$error_ref", $inf->errorNo) ;
$inf->zap($end_offset)
or return $self->saveErrorString(undef, "Error Zapping: $$error_ref", $inf->errorNo) ;
my $def = *$self->{Compress} = $inf->createDeflate();
*$self->{Header} = *$inf->{Info}{Header};
*$self->{UnCompSize} = *$inf->{UnCompSize}->clone();
*$self->{CompSize} = *$inf->{CompSize}->clone();
# TODO -- fix this
#*$self->{CompSize} = new U64(0, *$self->{UnCompSize_32bit});
if ( $outType eq 'buffer')
{ substr( ${ *$self->{Buffer} }, $end_offset) = '' }
elsif ($outType eq 'handle' || $outType eq 'filename') {
*$self->{FH} = *$inf->{FH} ;
delete *$inf->{FH};
*$self->{FH}->flush() ;
*$self->{Handle} = 1 if $outType eq 'handle';
#seek(*$self->{FH}, $end_offset, SEEK_SET)
*$self->{FH}->seek($end_offset, SEEK_SET)
or return $self->saveErrorString(undef, $!, $!) ;
}
return $def ;
}
#### zlib specific methods
sub deflateParams
{
my $self = shift ;
my $level = shift ;
my $strategy = shift ;
my $status = *$self->{Compress}->deflateParams(Level => $level, Strategy => $strategy) ;
return $self->saveErrorString(0, *$self->{Compress}{Error}, *$self->{Compress}{ErrorNo})
if $status == STATUS_ERROR;
return 1;
}
1;
__END__
=head1 NAME
IO::Compress::RawDeflate - Write RFC 1951 files/buffers
=head1 SYNOPSIS
use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
my $status = rawdeflate $input => $output [,OPTS]
or die "rawdeflate failed: $RawDeflateError\n";
my $z = new IO::Compress::RawDeflate $output [,OPTS]
or die "rawdeflate failed: $RawDeflateError\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() ;
$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 ;
=head1 DESCRIPTION
This module provides a Perl interface that allows writing compressed
data to files or buffer as defined in RFC 1951.
Note that RFC 1951 data is not a good choice of compression format
to use in isolation, especially if you want to auto-detect it.
For reading RFC 1951 files/buffers, see the companion module
L<IO::Uncompress::RawInflate|IO::Uncompress::RawInflate>.
=head1 Functional Interface
A top-level function, C<rawdeflate>, 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::RawDeflate qw(rawdeflate $RawDeflateError) ;
rawdeflate $input_filename_or_reference => $output_filename_or_reference [,OPTS]
or die "rawdeflate failed: $RawDeflateError\n";
The functional interface needs Perl5.005 or better.
=head2 rawdeflate $input_filename_or_reference => $output_filename_or_reference [, OPTS]
C<rawdeflate> expects at least two parameters,
C<$input_filename_or_reference> and C<$output_filename_or_reference>.
=head3 The C<$input_filename_or_reference> parameter
The parameter, C<$input_filename_or_reference>, 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 <$input_filename_or_reference> 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_filename_or_reference> 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_filename_or_reference> is a scalar reference, the input data
will be read from C<$$input_filename_or_reference>.
=item An array reference
If C<$input_filename_or_reference> is an array reference, each element in
the array must be a filename.
The input data will be read from each file in turn.
The complete array will be walked to ensure that it only
contains valid filenames before any data is compressed.
=item An Input FileGlob string
If C<$input_filename_or_reference> is a string that is delimited by the
characters "<" and ">" C<rawdeflate> will assume that it is an
I<input fileglob string>. The input is the list of files that match the
fileglob.
See L<File::GlobMapper|File::GlobMapper> for more details.
=back
If the C<$input_filename_or_reference> parameter is any other type,
C<undef> will be returned.
=head3 The C<$output_filename_or_reference> parameter
The parameter C<$output_filename_or_reference> is used to control the
destination of the compressed data. This parameter can take one of
these forms.
=over 5
=item A filename
If the C<$output_filename_or_reference> 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<$output_filename_or_reference> parameter is a filehandle, the
compressed data will be written to it. The string '-' can be used as
an alias for standard output.
=item A scalar reference
If C<$output_filename_or_reference> is a scalar reference, the
compressed data will be stored in C<$$output_filename_or_reference>.
=item An Array Reference
If C<$output_filename_or_reference> is an array reference,
the compressed data will be pushed onto the array.
=item An Output FileGlob
If C<$output_filename_or_reference> is a string that is delimited by the
characters "<" and ">" C<rawdeflate> will assume that it is an
I<output fileglob string>. The output is the list of files that match the
fileglob.
When C<$output_filename_or_reference> is an fileglob string,
C<$input_filename_or_reference> must also be a fileglob string. Anything
else is an error.
See L<File::GlobMapper|File::GlobMapper> for more details.
=back
If the C<$output_filename_or_reference> parameter is any other type,
C<undef> will be returned.
=head2 Notes
When C<$input_filename_or_reference> maps to multiple files/buffers and
C<$output_filename_or_reference> is a single
file/buffer the input files/buffers will be stored
in C<$output_filename_or_reference> as a concatenated series of compressed data streams.
=head2 Optional Parameters
Unless specified below, the optional parameters for C<rawdeflate>,
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<rawdeflate> 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<rawdeflate> 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 >>
The behaviour of this option is dependent on the type of output data
stream.
=over 5
=item * A Buffer
If C<Append> is enabled, all compressed data will be append to the end of
the output buffer. Otherwise the output buffer will be cleared before any
compressed data is written to it.
=item * A Filename
If 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<Append> is enabled, the filehandle 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
When C<Append> is specified, and set to true, it will I<append> all compressed
data to the output data stream.
So when the output is a filehandle it will carry out a seek to the eof
before writing any compressed data. If the output is a filename, it will be opened for
appending. If the output is a buffer, all compressed data will be
appended to the existing buffer.
Conversely when C<Append> is not specified, or it is present and is set to
false, it will operate as follows.
When the output is a filename, it will truncate the contents of the file
before writing any compressed data. If the output is a filehandle
its position will not be changed. If the output is a buffer, it will be
wiped before any compressed data is output.
Defaults to 0.
=back
=head2 Examples
To read the contents of the file C<file1.txt> and write the compressed
data to the file C<file1.txt.1951>.
use strict ;
use warnings ;
use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ;
my $input = "file1.txt";
rawdeflate $input => "$input.1951"
or die "rawdeflate failed: $RawDeflateError\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::RawDeflate qw(rawdeflate $RawDeflateError) ;
use IO::File ;
my $input = new IO::File "<file1.txt"
or die "Cannot open 'file1.txt': $!\n" ;
my $buffer ;
rawdeflate $input => \$buffer
or die "rawdeflate failed: $RawDeflateError\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::RawDeflate qw(rawdeflate $RawDeflateError) ;
rawdeflate '</my/home/*.txt>' => '<*.1951>'
or die "rawdeflate failed: $RawDeflateError\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::RawDeflate qw(rawdeflate $RawDeflateError) ;
for my $input ( glob "/my/home/*.txt" )
{
my $output = "$input.1951" ;
rawdeflate $input => $output
or die "Error compressing '$input': $RawDeflateError\n";
}
=head1 OO Interface
=head2 Constructor
The format of the constructor for C<IO::Compress::RawDeflate> is shown below
my $z = new IO::Compress::RawDeflate $output [,OPTS]
or die "IO::Compress::RawDeflate failed: $RawDeflateError\n";
It returns an C<IO::Compress::RawDeflate> object on success and undef on failure.
The variable C<$RawDeflateError> will contain an error message on failure.
If you are running Perl 5.005 or better the object, C<$z>, returned from
IO::Compress::RawDeflate 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<$output> parameter is any other type, C<IO::Compress::RawDeflate>::new will
return undef.
=head2 Constructor Options
C<OPTS> is any combination of the following options:
=over 5
=item C<< AutoClose => 0|1 >>
This option is only valid when the C<$output> parameter is a filehandle. If
specified, and the value is true, it will result in the C<$output> being
closed once either the C<close> method is called or the C<IO::Compress::RawDeflate>
object is destroyed.
This parameter defaults to 0.
=item C<< Append => 0|1 >>
Opens C<$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 of 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<< Merge => 0|1 >>
This option is used to compress input data and append it to an existing
compressed data stream in C<$output>. The end result is a single compressed
data stream stored in C<$output>.
It is a fatal error to attempt to use this option when C<$output> is not an
RFC 1951 data stream.
There are a number of other limitations with the C<Merge> option:
=over 5
=item 1
This module needs to have been built with zlib 1.2.1 or better to work. A
fatal error will be thrown if C<Merge> is used with an older version of
zlib.
=item 2
If C<$output> is a file or a filehandle, it must be seekable.
=back
This parameter defaults to 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::RawDeflate> by default.
use IO::Compress::RawDeflate qw(:strategy);
use IO::Compress::RawDeflate qw(:constants);
use IO::Compress::RawDeflate 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<$z> object is associated with a file or a filehandle, C<fileno>
will return the underlying file descriptor. Once the C<close> method is
called C<fileno> will return C<undef>.
If the C<$z> object is associated with a buffer, this method will return
C<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::RawDeflate 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::RawDeflate
object was created, and the object is associated with a file, the
underlying file will also be closed.
=head2 newStream([OPTS])
Usage is
$z->newStream( [OPTS] )
Closes the current compressed data stream and starts a new one.
OPTS consists of any of the options that are available when creating
the C<$z> object.
See the L</"Constructor Options"> section for more details.
=head2 deflateParams
Usage is
$z->deflateParams
TODO
=head1 Importing
A number of symbolic constants are required by some methods in
C<IO::Compress::RawDeflate>. None are imported by default.
=over 5
=item :all
Imports C<rawdeflate>, C<$RawDeflateError> and all symbolic
constants that can be used by C<IO::Compress::RawDeflate>. Same as doing this
use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError :constants) ;
=item :constants
Import all symbolic constants. Same as doing this
use IO::Compress::RawDeflate qw(:flush :level :strategy) ;
=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
=back
=head1 EXAMPLES
=head2 Apache::GZip Revisited
See L<IO::Compress::FAQ|IO::Compress::FAQ/"Apache::GZip Revisited">
=head2 Working with Net::FTP
See L<IO::Compress::FAQ|IO::Compress::FAQ/"Compressed files and Net::FTP">
=head1 SEE ALSO
L<Compress::Zlib>, L<IO::Compress::Gzip>, L<IO::Uncompress::Gunzip>, L<IO::Compress::Deflate>, L<IO::Uncompress::Inflate>, L<IO::Uncompress::RawInflate>, L<IO::Compress::Bzip2>, L<IO::Uncompress::Bunzip2>, L<IO::Compress::Lzma>, L<IO::Uncompress::UnLzma>, L<IO::Compress::Xz>, L<IO::Uncompress::UnXz>, L<IO::Compress::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Compress::Lzf>, L<IO::Uncompress::UnLzf>, L<IO::Uncompress::AnyInflate>, L<IO::Uncompress::AnyUncompress>
L<IO::Compress::FAQ|IO::Compress::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
L<http://www.faqs.org/rfcs/rfc1950.html>,
L<http://www.faqs.org/rfcs/rfc1951.html> and
L<http://www.faqs.org/rfcs/rfc1952.html>
The I<zlib> compression library was written by Jean-loup Gailly
C<gzip@prep.ai.mit.edu> and Mark Adler C<madler@alumni.caltech.edu>.
The primary site for the I<zlib> compression library is
L<http://www.zlib.org>.
The primary site for gzip is L<http://www.gzip.org>.
=head1 AUTHOR
This module was written by Paul Marquess, C<pmqs@cpan.org>.
=head1 MODIFICATION HISTORY
See the Changes file.
=head1 COPYRIGHT AND LICENSE
Copyright (c) 2005-2018 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.