2 package IO::Uncompress::Gunzip ;
12 use IO::Uncompress::RawInflate ;
14 use Compress::Raw::Zlib qw( crc32 ) ;
15 use IO::Compress::Base::Common qw(:Status createSelfTiedObject);
16 use IO::Compress::Gzip::Constants;
17 use IO::Compress::Zlib::Extra;
21 our ($VERSION, @ISA, @EXPORT_OK, %EXPORT_TAGS, $GunzipError);
23 @ISA = qw( Exporter IO::Uncompress::RawInflate );
24 @EXPORT_OK = qw( $GunzipError gunzip );
25 %EXPORT_TAGS = %IO::Uncompress::RawInflate::DEFLATE_CONSTANTS ;
26 push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ;
27 Exporter::export_ok_tags('all');
37 my $obj = createSelfTiedObject($class, \$GunzipError);
39 $obj->_create(undef, 0, @_);
44 my $obj = createSelfTiedObject(undef, \$GunzipError);
45 return $obj->_inf(@_) ;
50 use IO::Compress::Base::Common qw(:Parse);
51 return ( 'ParseExtra' => [1, 1, Parse_boolean, 0] ) ;
59 # gunzip always needs crc32
60 $got->value('CRC32' => 1);
70 $self->smartReadExact(\$magic, GZIP_ID_SIZE);
72 *$self->{HeaderPending} = $magic ;
74 return $self->HeaderError("Minimum header size is " .
75 GZIP_MIN_HEADER_SIZE . " bytes")
76 if length $magic != GZIP_ID_SIZE ;
78 return $self->HeaderError("Bad Magic")
79 if ! isGzipMagic($magic) ;
81 *$self->{Type} = 'rfc1952';
91 return $self->_readGzipHeader($magic);
100 my ($CRC32, $ISIZE) = unpack("V V", $trailer) ;
101 *$self->{Info}{CRC32} = $CRC32;
102 *$self->{Info}{ISIZE} = $ISIZE;
104 if (*$self->{Strict}) {
105 return $self->TrailerError("CRC mismatch")
106 if $CRC32 != *$self->{Uncomp}->crc32() ;
108 my $exp_isize = *$self->{UnCompSize}->get32bit();
109 return $self->TrailerError("ISIZE mismatch. Got $ISIZE"
110 . ", expected $exp_isize")
111 if $ISIZE != $exp_isize ;
120 return 0 if length $buffer < GZIP_ID_SIZE ;
121 my ($id1, $id2) = unpack("C C", $buffer) ;
122 return $id1 == GZIP_ID1 && $id2 == GZIP_ID2 ;
125 sub _readFullGzipHeader($)
130 $self->smartReadExact(\$magic, GZIP_ID_SIZE);
132 *$self->{HeaderPending} = $magic ;
134 return $self->HeaderError("Minimum header size is " .
135 GZIP_MIN_HEADER_SIZE . " bytes")
136 if length $magic != GZIP_ID_SIZE ;
139 return $self->HeaderError("Bad Magic")
140 if ! isGzipMagic($magic) ;
142 my $status = $self->_readGzipHeader($magic);
143 delete *$self->{Transparent} if ! defined $status ;
147 sub _readGzipHeader($)
149 my ($self, $magic) = @_ ;
153 $self->smartReadExact(\$buffer, GZIP_MIN_HEADER_SIZE - GZIP_ID_SIZE)
154 or return $self->HeaderError("Minimum header size is " .
155 GZIP_MIN_HEADER_SIZE . " bytes") ;
157 my $keep = $magic . $buffer ;
158 *$self->{HeaderPending} = $keep ;
160 # now split out the various parts
161 my ($cm, $flag, $mtime, $xfl, $os) = unpack("C C V C C", $buffer) ;
163 $cm == GZIP_CM_DEFLATED
164 or return $self->HeaderError("Not Deflate (CM is $cm)") ;
166 # check for use of reserved bits
167 return $self->HeaderError("Use of Reserved Bits in FLG field.")
168 if $flag & GZIP_FLG_RESERVED ;
172 if ($flag & GZIP_FLG_FEXTRA) {
174 $self->smartReadExact(\$buffer, GZIP_FEXTRA_HEADER_SIZE)
175 or return $self->TruncatedHeader("FEXTRA Length") ;
177 my ($XLEN) = unpack("v", $buffer) ;
178 $self->smartReadExact(\$EXTRA, $XLEN)
179 or return $self->TruncatedHeader("FEXTRA Body");
180 $keep .= $buffer . $EXTRA ;
182 if ($XLEN && *$self->{'ParseExtra'}) {
183 my $bad = IO::Compress::Zlib::Extra::parseRawExtra($EXTRA,
185 return $self->HeaderError($bad)
191 if ($flag & GZIP_FLG_FNAME) {
194 $self->smartReadExact(\$buffer, 1)
195 or return $self->TruncatedHeader("FNAME");
196 last if $buffer eq GZIP_NULL_BYTE ;
199 $keep .= $origname . GZIP_NULL_BYTE ;
201 return $self->HeaderError("Non ISO 8859-1 Character found in Name")
202 if *$self->{Strict} && $origname =~ /$GZIP_FNAME_INVALID_CHAR_RE/o ;
206 if ($flag & GZIP_FLG_FCOMMENT) {
209 $self->smartReadExact(\$buffer, 1)
210 or return $self->TruncatedHeader("FCOMMENT");
211 last if $buffer eq GZIP_NULL_BYTE ;
214 $keep .= $comment . GZIP_NULL_BYTE ;
216 return $self->HeaderError("Non ISO 8859-1 Character found in Comment")
217 if *$self->{Strict} && $comment =~ /$GZIP_FCOMMENT_INVALID_CHAR_RE/o ;
220 if ($flag & GZIP_FLG_FHCRC) {
221 $self->smartReadExact(\$buffer, GZIP_FHCRC_SIZE)
222 or return $self->TruncatedHeader("FHCRC");
224 $HeaderCRC = unpack("v", $buffer) ;
225 my $crc16 = crc32($keep) & 0xFF ;
227 return $self->HeaderError("CRC16 mismatch.")
228 if *$self->{Strict} && $crc16 != $HeaderCRC;
233 # Assume compression method is deflated for xfl tests
237 *$self->{Type} = 'rfc1952';
241 'FingerprintLength' => 2,
242 'HeaderLength' => length $keep,
243 'TrailerLength' => GZIP_TRAILER_SIZE,
245 'isMinimalHeader' => $keep eq GZIP_MINIMUM_HEADER ? 1 : 0,
248 'MethodName' => $cm == GZIP_CM_DEFLATED ? "Deflated" : "Unknown" ,
249 'TextFlag' => $flag & GZIP_FLG_FTEXT ? 1 : 0,
250 'HeaderCRCFlag' => $flag & GZIP_FLG_FHCRC ? 1 : 0,
251 'NameFlag' => $flag & GZIP_FLG_FNAME ? 1 : 0,
252 'CommentFlag' => $flag & GZIP_FLG_FCOMMENT ? 1 : 0,
253 'ExtraFlag' => $flag & GZIP_FLG_FEXTRA ? 1 : 0,
255 'Comment' => $comment,
258 'OsName' => defined $GZIP_OS_Names{$os}
259 ? $GZIP_OS_Names{$os} : "Unknown",
260 'HeaderCRC' => $HeaderCRC,
262 'ExtraFlags' => $xfl,
263 'ExtraFieldRaw' => $EXTRA,
264 'ExtraField' => [ @EXTRA ],
267 #'CompSize'=> $compsize,
269 #'OrigSize'=> $ISIZE,
283 IO::Uncompress::Gunzip - Read RFC 1952 files/buffers
289 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
291 my $status = gunzip $input => $output [,OPTS]
292 or die "gunzip failed: $GunzipError\n";
294 my $z = new IO::Uncompress::Gunzip $input [OPTS]
295 or die "gunzip failed: $GunzipError\n";
297 $status = $z->read($buffer)
298 $status = $z->read($buffer, $length)
299 $status = $z->read($buffer, $length, $offset)
300 $line = $z->getline()
305 $status = $z->inflateSync()
307 $data = $z->trailingData()
308 $status = $z->nextStream()
309 $data = $z->getHeaderInfo()
311 $z->seek($position, $whence)
323 read($z, $buffer, $length);
324 read($z, $buffer, $length, $offset);
326 seek($z, $position, $whence)
337 This module provides a Perl interface that allows the reading of
338 files/buffers that conform to RFC 1952.
340 For writing RFC 1952 files/buffers, see the companion module IO::Compress::Gzip.
346 =head1 Functional Interface
348 A top-level function, C<gunzip>, is provided to carry out
349 "one-shot" uncompression between buffers and/or files. For finer
350 control over the uncompression process, see the L</"OO Interface">
353 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
355 gunzip $input => $output [,OPTS]
356 or die "gunzip failed: $GunzipError\n";
360 The functional interface needs Perl5.005 or better.
363 =head2 gunzip $input => $output [, OPTS]
366 C<gunzip> expects at least two parameters, C<$input> and C<$output>.
368 =head3 The C<$input> parameter
370 The parameter, C<$input>, is used to define the source of
373 It can take one of the following forms:
379 If the C<$input> parameter is a simple scalar, it is assumed to be a
380 filename. This file will be opened for reading and the input data
381 will be read from it.
385 If the C<$input> parameter is a filehandle, the input data will be
387 The string '-' can be used as an alias for standard input.
389 =item A scalar reference
391 If C<$input> is a scalar reference, the input data will be read
394 =item An array reference
396 If C<$input> is an array reference, each element in the array must be a
399 The input data will be read from each file in turn.
401 The complete array will be walked to ensure that it only
402 contains valid filenames before any data is uncompressed.
406 =item An Input FileGlob string
408 If C<$input> is a string that is delimited by the characters "<" and ">"
409 C<gunzip> will assume that it is an I<input fileglob string>. The
410 input is the list of files that match the fileglob.
412 If the fileglob does not match any files ...
414 See L<File::GlobMapper|File::GlobMapper> for more details.
419 If the C<$input> parameter is any other type, C<undef> will be returned.
423 =head3 The C<$output> parameter
425 The parameter C<$output> is used to control the destination of the
426 uncompressed data. This parameter can take one of these forms.
432 If the C<$output> parameter is a simple scalar, it is assumed to be a
433 filename. This file will be opened for writing and the uncompressed
434 data will be written to it.
438 If the C<$output> parameter is a filehandle, the uncompressed data
439 will be written to it.
440 The string '-' can be used as an alias for standard output.
443 =item A scalar reference
445 If C<$output> is a scalar reference, the uncompressed data will be
446 stored in C<$$output>.
450 =item An Array Reference
452 If C<$output> is an array reference, the uncompressed data will be
453 pushed onto the array.
455 =item An Output FileGlob
457 If C<$output> is a string that is delimited by the characters "<" and ">"
458 C<gunzip> will assume that it is an I<output fileglob string>. The
459 output is the list of files that match the fileglob.
461 When C<$output> is an fileglob string, C<$input> must also be a fileglob
462 string. Anything else is an error.
466 If the C<$output> parameter is any other type, C<undef> will be returned.
473 When C<$input> maps to multiple compressed files/buffers and C<$output> is
474 a single file/buffer, after uncompression C<$output> will contain a
475 concatenation of all the uncompressed data from each of the input
482 =head2 Optional Parameters
484 Unless specified below, the optional parameters for C<gunzip>,
485 C<OPTS>, are the same as those used with the OO interface defined in the
486 L</"Constructor Options"> section below.
490 =item C<< AutoClose => 0|1 >>
492 This option applies to any input or output data streams to
493 C<gunzip> that are filehandles.
495 If C<AutoClose> is specified, and the value is true, it will result in all
496 input and/or output filehandles being closed once C<gunzip> has
499 This parameter defaults to 0.
502 =item C<< BinModeOut => 0|1 >>
504 When writing to a file or filehandle, set C<binmode> before writing to the
513 =item C<< Append => 0|1 >>
517 =item C<< MultiStream => 0|1 >>
520 If the input file/buffer contains multiple compressed data streams, this
521 option will uncompress the whole lot as a single data stream.
529 =item C<< TrailingData => $scalar >>
531 Returns the data, if any, that is present immediately after the compressed
532 data stream once uncompression is complete.
534 This option can be used when there is useful information immediately
535 following the compressed data stream, and you don't know the length of the
536 compressed data stream.
538 If the input is a buffer, C<trailingData> will return everything from the
539 end of the compressed data stream to the end of the buffer.
541 If the input is a filehandle, C<trailingData> will return the data that is
542 left in the filehandle input buffer once the end of the compressed data
543 stream has been reached. You can then use the filehandle to read the rest
546 Don't bother using C<trailingData> if the input is a filename.
550 If you know the length of the compressed data stream before you start
551 uncompressing, you can avoid having to use C<trailingData> by setting the
552 C<InputLength> option.
563 To read the contents of the file C<file1.txt.gz> and write the
564 compressed data to the file C<file1.txt>.
568 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
570 my $input = "file1.txt.gz";
571 my $output = "file1.txt";
572 gunzip $input => $output
573 or die "gunzip failed: $GunzipError\n";
576 To read from an existing Perl filehandle, C<$input>, and write the
577 uncompressed data to a buffer, C<$buffer>.
581 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
584 my $input = new IO::File "<file1.txt.gz"
585 or die "Cannot open 'file1.txt.gz': $!\n" ;
587 gunzip $input => \$buffer
588 or die "gunzip failed: $GunzipError\n";
590 To uncompress all files in the directory "/my/home" that match "*.txt.gz" and store the compressed data in the same directory
594 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
596 gunzip '</my/home/*.txt.gz>' => '</my/home/#1.txt>'
597 or die "gunzip failed: $GunzipError\n";
599 and if you want to compress each file one at a time, this will do the trick
603 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
605 for my $input ( glob "/my/home/*.txt.gz" )
609 gunzip $input => $output
610 or die "Error compressing '$input': $GunzipError\n";
617 The format of the constructor for IO::Uncompress::Gunzip is shown below
620 my $z = new IO::Uncompress::Gunzip $input [OPTS]
621 or die "IO::Uncompress::Gunzip failed: $GunzipError\n";
623 Returns an C<IO::Uncompress::Gunzip> object on success and undef on failure.
624 The variable C<$GunzipError> will contain an error message on failure.
626 If you are running Perl 5.005 or better the object, C<$z>, returned from
627 IO::Uncompress::Gunzip can be used exactly like an L<IO::File|IO::File> filehandle.
628 This means that all normal input file operations can be carried out with
629 C<$z>. For example, to read a line from a compressed file/buffer you can
630 use either of these forms
632 $line = $z->getline();
635 The mandatory parameter C<$input> is used to determine the source of the
636 compressed data. This parameter can take one of three forms.
642 If the C<$input> parameter is a scalar, it is assumed to be a filename. This
643 file will be opened for reading and the compressed data will be read from it.
647 If the C<$input> parameter is a filehandle, the compressed data will be
649 The string '-' can be used as an alias for standard input.
652 =item A scalar reference
654 If C<$input> is a scalar reference, the compressed data will be read from
659 =head2 Constructor Options
662 The option names defined below are case insensitive and can be optionally
663 prefixed by a '-'. So all of the following are valid
670 OPTS is a combination of the following options:
674 =item C<< AutoClose => 0|1 >>
676 This option is only valid when the C<$input> parameter is a filehandle. If
677 specified, and the value is true, it will result in the file being closed once
678 either the C<close> method is called or the IO::Uncompress::Gunzip object is
681 This parameter defaults to 0.
683 =item C<< MultiStream => 0|1 >>
687 Allows multiple concatenated compressed streams to be treated as a single
688 compressed stream. Decompression will stop once either the end of the
689 file/buffer is reached, an error is encountered (premature eof, corrupt
690 compressed data) or the end of a stream is not immediately followed by the
691 start of another stream.
693 This parameter defaults to 0.
696 =item C<< Prime => $string >>
698 This option will uncompress the contents of C<$string> before processing the
701 This option can be useful when the compressed data is embedded in another
702 file/data structure and it is not possible to work out where the compressed
703 data begins without having to read the first few bytes. If this is the
704 case, the uncompression can be I<primed> with these bytes using this
707 =item C<< Transparent => 0|1 >>
709 If this option is set and the input file/buffer is not compressed data,
710 the module will allow reading of it anyway.
712 In addition, if the input file/buffer does contain compressed data and
713 there is non-compressed data immediately following it, setting this option
714 will make this module treat the whole file/bufffer as a single data stream.
716 This option defaults to 1.
718 =item C<< BlockSize => $num >>
720 When reading the compressed input data, IO::Uncompress::Gunzip will read it in
721 blocks of C<$num> bytes.
723 This option defaults to 4096.
725 =item C<< InputLength => $size >>
727 When present this option will limit the number of compressed bytes read
728 from the input file/buffer to C<$size>. This option can be used in the
729 situation where there is useful data directly after the compressed data
730 stream and you know beforehand the exact length of the compressed data
733 This option is mostly used when reading from a filehandle, in which case
734 the file pointer will be left pointing to the first byte directly after the
735 compressed data stream.
739 This option defaults to off.
741 =item C<< Append => 0|1 >>
743 This option controls what the C<read> method does with uncompressed data.
745 If set to 1, all uncompressed data will be appended to the output parameter
746 of the C<read> method.
748 If set to 0, the contents of the output parameter of the C<read> method
749 will be overwritten by the uncompressed data.
753 =item C<< Strict => 0|1 >>
757 This option controls whether the extra checks defined below are used when
758 carrying out the decompression. When Strict is on, the extra tests are
759 carried out, when Strict is off they are not.
761 The default for this option is off.
775 If the FHCRC bit is set in the gzip FLG header byte, the CRC16 bytes in the
776 header must match the crc16 value of the gzip header actually read.
780 If the gzip header contains a name field (FNAME) it consists solely of ISO
785 If the gzip header contains a comment field (FCOMMENT) it consists solely
786 of ISO 8859-1 characters plus line-feed.
790 If the gzip FEXTRA header field is present it must conform to the sub-field
791 structure as defined in RFC 1952.
795 The CRC32 and ISIZE trailer fields must be present.
799 The value of the CRC32 field read must match the crc32 value of the
800 uncompressed data actually contained in the gzip file.
804 The value of the ISIZE fields read must match the length of the
805 uncompressed data actually read from the file.
815 =item C<< ParseExtra => 0|1 >>
816 If the gzip FEXTRA header field is present and this option is set, it will
817 force the module to check that it conforms to the sub-field structure as
820 If the C<Strict> is on it will automatically enable this option.
839 $status = $z->read($buffer)
841 Reads a block of compressed data (the size the the compressed block is
842 determined by the C<Buffer> option in the constructor), uncompresses it and
843 writes any uncompressed data into C<$buffer>. If the C<Append> parameter is
844 set in the constructor, the uncompressed data will be appended to the
845 C<$buffer> parameter. Otherwise C<$buffer> will be overwritten.
847 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
848 or a negative number on error.
854 $status = $z->read($buffer, $length)
855 $status = $z->read($buffer, $length, $offset)
857 $status = read($z, $buffer, $length)
858 $status = read($z, $buffer, $length, $offset)
860 Attempt to read C<$length> bytes of uncompressed data into C<$buffer>.
862 The main difference between this form of the C<read> method and the
863 previous one, is that this one will attempt to return I<exactly> C<$length>
864 bytes. The only circumstances that this function will not is if end-of-file
865 or an IO error is encountered.
867 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
868 or a negative number on error.
875 $line = $z->getline()
880 This method fully supports the use of of the variable C<$/> (or
881 C<$INPUT_RECORD_SEPARATOR> or C<$RS> when C<English> is in use) to
882 determine what constitutes an end of line. Paragraph mode, record mode and
883 file slurp mode are all supported.
892 Read a single character.
898 $char = $z->ungetc($string)
906 $status = $z->inflateSync()
915 $hdr = $z->getHeaderInfo();
916 @hdrs = $z->getHeaderInfo();
918 This method returns either a hash reference (in scalar context) or a list
919 or hash references (in array context) that contains information about each
920 of the header fields in the compressed data stream(s).
928 The contents of the Name header field, if present. If no name is
929 present, the value will be undef. Note this is different from a zero length
930 name, which will return an empty string.
934 The contents of the Comment header field, if present. If no comment is
935 present, the value will be undef. Note this is different from a zero length
936 comment, which will return an empty string.
950 Returns the uncompressed file offset.
961 Returns true if the end of the compressed input stream has been reached.
967 $z->seek($position, $whence);
968 seek($z, $position, $whence);
973 Provides a sub-set of the C<seek> functionality, with the restriction
974 that it is only legal to seek forward in the input file/buffer.
975 It is a fatal error to attempt to seek backward.
979 The C<$whence> parameter takes one the usual values, namely SEEK_SET,
980 SEEK_CUR or SEEK_END.
982 Returns 1 on success, 0 on failure.
991 This is a noop provided for completeness.
997 Returns true if the object currently refers to a opened file/buffer.
1001 my $prev = $z->autoflush()
1002 my $prev = $z->autoflush(EXPR)
1004 If the C<$z> object is associated with a file or a filehandle, this method
1005 returns the current autoflush setting for the underlying filehandle. If
1006 C<EXPR> is present, and is non-zero, it will enable flushing after every
1007 write/print operation.
1009 If C<$z> is associated with a buffer, this method has no effect and always
1012 B<Note> that the special variable C<$|> B<cannot> be used to set or
1013 retrieve the autoflush setting.
1015 =head2 input_line_number
1017 $z->input_line_number()
1018 $z->input_line_number(EXPR)
1022 Returns the current uncompressed line number. If C<EXPR> is present it has
1023 the effect of setting the line number. Note that setting the line number
1024 does not change the current position within the file/buffer being read.
1026 The contents of C<$/> are used to to determine what constitutes a line
1036 If the C<$z> object is associated with a file or a filehandle, this method
1037 will return the underlying file descriptor.
1039 If the C<$z> object is is associated with a buffer, this method will
1049 Closes the output file/buffer.
1053 For most versions of Perl this method will be automatically invoked if
1054 the IO::Uncompress::Gunzip object is destroyed (either explicitly or by the
1055 variable with the reference to the object going out of scope). The
1056 exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
1057 these cases, the C<close> method will be called automatically, but
1058 not until global destruction of all live objects when the program is
1061 Therefore, if you want your scripts to be able to run on all versions
1062 of Perl, you should call C<close> explicitly and not rely on automatic
1065 Returns true on success, otherwise 0.
1067 If the C<AutoClose> option has been enabled when the IO::Uncompress::Gunzip
1068 object was created, and the object is associated with a file, the
1069 underlying file will also be closed.
1078 my $status = $z->nextStream();
1080 Skips to the next compressed data stream in the input file/buffer. If a new
1081 compressed data stream is found, the eof marker will be cleared and C<$.>
1084 Returns 1 if a new stream was found, 0 if none was found, and -1 if an
1085 error was encountered.
1091 my $data = $z->trailingData();
1093 Returns the data, if any, that is present immediately after the compressed
1094 data stream once uncompression is complete. It only makes sense to call
1095 this method once the end of the compressed data stream has been
1098 This option can be used when there is useful information immediately
1099 following the compressed data stream, and you don't know the length of the
1100 compressed data stream.
1102 If the input is a buffer, C<trailingData> will return everything from the
1103 end of the compressed data stream to the end of the buffer.
1105 If the input is a filehandle, C<trailingData> will return the data that is
1106 left in the filehandle input buffer once the end of the compressed data
1107 stream has been reached. You can then use the filehandle to read the rest
1110 Don't bother using C<trailingData> if the input is a filename.
1114 If you know the length of the compressed data stream before you start
1115 uncompressing, you can avoid having to use C<trailingData> by setting the
1116 C<InputLength> option in the constructor.
1120 No symbolic constants are required by this IO::Uncompress::Gunzip at present.
1126 Imports C<gunzip> and C<$GunzipError>.
1129 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
1140 L<Compress::Zlib>, L<IO::Compress::Gzip>, 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::Compress::Lzf>, L<IO::Uncompress::UnLzf>, L<IO::Uncompress::AnyInflate>, L<IO::Uncompress::AnyUncompress>
1142 L<Compress::Zlib::FAQ|Compress::Zlib::FAQ>
1144 L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
1145 L<Archive::Tar|Archive::Tar>,
1146 L<IO::Zlib|IO::Zlib>
1149 For RFC 1950, 1951 and 1952 see
1150 F<http://www.faqs.org/rfcs/rfc1950.html>,
1151 F<http://www.faqs.org/rfcs/rfc1951.html> and
1152 F<http://www.faqs.org/rfcs/rfc1952.html>
1154 The I<zlib> compression library was written by Jean-loup Gailly
1155 F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>.
1157 The primary site for the I<zlib> compression library is
1158 F<http://www.zlib.org>.
1160 The primary site for gzip is F<http://www.gzip.org>.
1167 This module was written by Paul Marquess, F<pmqs@cpan.org>.
1171 =head1 MODIFICATION HISTORY
1173 See the Changes file.
1175 =head1 COPYRIGHT AND LICENSE
1177 Copyright (c) 2005-2006 Paul Marquess. All rights reserved.
1179 This program is free software; you can redistribute it and/or
1180 modify it under the same terms as Perl itself.