2 package IO::Uncompress::Gunzip ;
12 use IO::Uncompress::RawInflate 2.012 ;
14 use Compress::Raw::Zlib 2.012 qw( crc32 ) ;
15 use IO::Compress::Base::Common 2.012 qw(:Status createSelfTiedObject);
16 use IO::Compress::Gzip::Constants 2.012 ;
17 use IO::Compress::Zlib::Extra 2.012 ;
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 2.012 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,
281 IO::Uncompress::Gunzip - Read RFC 1952 files/buffers
285 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
287 my $status = gunzip $input => $output [,OPTS]
288 or die "gunzip failed: $GunzipError\n";
290 my $z = new IO::Uncompress::Gunzip $input [OPTS]
291 or die "gunzip failed: $GunzipError\n";
293 $status = $z->read($buffer)
294 $status = $z->read($buffer, $length)
295 $status = $z->read($buffer, $length, $offset)
296 $line = $z->getline()
301 $status = $z->inflateSync()
303 $data = $z->trailingData()
304 $status = $z->nextStream()
305 $data = $z->getHeaderInfo()
307 $z->seek($position, $whence)
319 read($z, $buffer, $length);
320 read($z, $buffer, $length, $offset);
322 seek($z, $position, $whence)
330 This module provides a Perl interface that allows the reading of
331 files/buffers that conform to RFC 1952.
333 For writing RFC 1952 files/buffers, see the companion module IO::Compress::Gzip.
335 =head1 Functional Interface
337 A top-level function, C<gunzip>, is provided to carry out
338 "one-shot" uncompression between buffers and/or files. For finer
339 control over the uncompression process, see the L</"OO Interface">
342 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
344 gunzip $input => $output [,OPTS]
345 or die "gunzip failed: $GunzipError\n";
347 The functional interface needs Perl5.005 or better.
349 =head2 gunzip $input => $output [, OPTS]
351 C<gunzip> expects at least two parameters, C<$input> and C<$output>.
353 =head3 The C<$input> parameter
355 The parameter, C<$input>, is used to define the source of
358 It can take one of the following forms:
364 If the C<$input> parameter is a simple scalar, it is assumed to be a
365 filename. This file will be opened for reading and the input data
366 will be read from it.
370 If the C<$input> parameter is a filehandle, the input data will be
372 The string '-' can be used as an alias for standard input.
374 =item A scalar reference
376 If C<$input> is a scalar reference, the input data will be read
379 =item An array reference
381 If C<$input> is an array reference, each element in the array must be a
384 The input data will be read from each file in turn.
386 The complete array will be walked to ensure that it only
387 contains valid filenames before any data is uncompressed.
389 =item An Input FileGlob string
391 If C<$input> is a string that is delimited by the characters "<" and ">"
392 C<gunzip> will assume that it is an I<input fileglob string>. The
393 input is the list of files that match the fileglob.
395 If the fileglob does not match any files ...
397 See L<File::GlobMapper|File::GlobMapper> for more details.
401 If the C<$input> parameter is any other type, C<undef> will be returned.
403 =head3 The C<$output> parameter
405 The parameter C<$output> is used to control the destination of the
406 uncompressed data. This parameter can take one of these forms.
412 If the C<$output> parameter is a simple scalar, it is assumed to be a
413 filename. This file will be opened for writing and the uncompressed
414 data will be written to it.
418 If the C<$output> parameter is a filehandle, the uncompressed data
419 will be written to it.
420 The string '-' can be used as an alias for standard output.
422 =item A scalar reference
424 If C<$output> is a scalar reference, the uncompressed data will be
425 stored in C<$$output>.
427 =item An Array Reference
429 If C<$output> is an array reference, the uncompressed data will be
430 pushed onto the array.
432 =item An Output FileGlob
434 If C<$output> is a string that is delimited by the characters "<" and ">"
435 C<gunzip> will assume that it is an I<output fileglob string>. The
436 output is the list of files that match the fileglob.
438 When C<$output> is an fileglob string, C<$input> must also be a fileglob
439 string. Anything else is an error.
443 If the C<$output> parameter is any other type, C<undef> will be returned.
447 When C<$input> maps to multiple compressed files/buffers and C<$output> is
448 a single file/buffer, after uncompression C<$output> will contain a
449 concatenation of all the uncompressed data from each of the input
452 =head2 Optional Parameters
454 Unless specified below, the optional parameters for C<gunzip>,
455 C<OPTS>, are the same as those used with the OO interface defined in the
456 L</"Constructor Options"> section below.
460 =item C<< AutoClose => 0|1 >>
462 This option applies to any input or output data streams to
463 C<gunzip> that are filehandles.
465 If C<AutoClose> is specified, and the value is true, it will result in all
466 input and/or output filehandles being closed once C<gunzip> has
469 This parameter defaults to 0.
471 =item C<< BinModeOut => 0|1 >>
473 When writing to a file or filehandle, set C<binmode> before writing to the
478 =item C<< Append => 0|1 >>
482 =item C<< MultiStream => 0|1 >>
484 If the input file/buffer contains multiple compressed data streams, this
485 option will uncompress the whole lot as a single data stream.
489 =item C<< TrailingData => $scalar >>
491 Returns the data, if any, that is present immediately after the compressed
492 data stream once uncompression is complete.
494 This option can be used when there is useful information immediately
495 following the compressed data stream, and you don't know the length of the
496 compressed data stream.
498 If the input is a buffer, C<trailingData> will return everything from the
499 end of the compressed data stream to the end of the buffer.
501 If the input is a filehandle, C<trailingData> will return the data that is
502 left in the filehandle input buffer once the end of the compressed data
503 stream has been reached. You can then use the filehandle to read the rest
506 Don't bother using C<trailingData> if the input is a filename.
508 If you know the length of the compressed data stream before you start
509 uncompressing, you can avoid having to use C<trailingData> by setting the
510 C<InputLength> option.
516 To read the contents of the file C<file1.txt.gz> and write the
517 compressed data to the file C<file1.txt>.
521 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
523 my $input = "file1.txt.gz";
524 my $output = "file1.txt";
525 gunzip $input => $output
526 or die "gunzip failed: $GunzipError\n";
528 To read from an existing Perl filehandle, C<$input>, and write the
529 uncompressed data to a buffer, C<$buffer>.
533 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
536 my $input = new IO::File "<file1.txt.gz"
537 or die "Cannot open 'file1.txt.gz': $!\n" ;
539 gunzip $input => \$buffer
540 or die "gunzip failed: $GunzipError\n";
542 To uncompress all files in the directory "/my/home" that match "*.txt.gz" and store the compressed data in the same directory
546 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
548 gunzip '</my/home/*.txt.gz>' => '</my/home/#1.txt>'
549 or die "gunzip failed: $GunzipError\n";
551 and if you want to compress each file one at a time, this will do the trick
555 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
557 for my $input ( glob "/my/home/*.txt.gz" )
561 gunzip $input => $output
562 or die "Error compressing '$input': $GunzipError\n";
569 The format of the constructor for IO::Uncompress::Gunzip is shown below
571 my $z = new IO::Uncompress::Gunzip $input [OPTS]
572 or die "IO::Uncompress::Gunzip failed: $GunzipError\n";
574 Returns an C<IO::Uncompress::Gunzip> object on success and undef on failure.
575 The variable C<$GunzipError> will contain an error message on failure.
577 If you are running Perl 5.005 or better the object, C<$z>, returned from
578 IO::Uncompress::Gunzip can be used exactly like an L<IO::File|IO::File> filehandle.
579 This means that all normal input file operations can be carried out with
580 C<$z>. For example, to read a line from a compressed file/buffer you can
581 use either of these forms
583 $line = $z->getline();
586 The mandatory parameter C<$input> is used to determine the source of the
587 compressed data. This parameter can take one of three forms.
593 If the C<$input> parameter is a scalar, it is assumed to be a filename. This
594 file will be opened for reading and the compressed data will be read from it.
598 If the C<$input> parameter is a filehandle, the compressed data will be
600 The string '-' can be used as an alias for standard input.
602 =item A scalar reference
604 If C<$input> is a scalar reference, the compressed data will be read from
609 =head2 Constructor Options
611 The option names defined below are case insensitive and can be optionally
612 prefixed by a '-'. So all of the following are valid
619 OPTS is a combination of the following options:
623 =item C<< AutoClose => 0|1 >>
625 This option is only valid when the C<$input> parameter is a filehandle. If
626 specified, and the value is true, it will result in the file being closed once
627 either the C<close> method is called or the IO::Uncompress::Gunzip object is
630 This parameter defaults to 0.
632 =item C<< MultiStream => 0|1 >>
634 Allows multiple concatenated compressed streams to be treated as a single
635 compressed stream. Decompression will stop once either the end of the
636 file/buffer is reached, an error is encountered (premature eof, corrupt
637 compressed data) or the end of a stream is not immediately followed by the
638 start of another stream.
640 This parameter defaults to 0.
642 =item C<< Prime => $string >>
644 This option will uncompress the contents of C<$string> before processing the
647 This option can be useful when the compressed data is embedded in another
648 file/data structure and it is not possible to work out where the compressed
649 data begins without having to read the first few bytes. If this is the
650 case, the uncompression can be I<primed> with these bytes using this
653 =item C<< Transparent => 0|1 >>
655 If this option is set and the input file/buffer is not compressed data,
656 the module will allow reading of it anyway.
658 In addition, if the input file/buffer does contain compressed data and
659 there is non-compressed data immediately following it, setting this option
660 will make this module treat the whole file/bufffer as a single data stream.
662 This option defaults to 1.
664 =item C<< BlockSize => $num >>
666 When reading the compressed input data, IO::Uncompress::Gunzip will read it in
667 blocks of C<$num> bytes.
669 This option defaults to 4096.
671 =item C<< InputLength => $size >>
673 When present this option will limit the number of compressed bytes read
674 from the input file/buffer to C<$size>. This option can be used in the
675 situation where there is useful data directly after the compressed data
676 stream and you know beforehand the exact length of the compressed data
679 This option is mostly used when reading from a filehandle, in which case
680 the file pointer will be left pointing to the first byte directly after the
681 compressed data stream.
683 This option defaults to off.
685 =item C<< Append => 0|1 >>
687 This option controls what the C<read> method does with uncompressed data.
689 If set to 1, all uncompressed data will be appended to the output parameter
690 of the C<read> method.
692 If set to 0, the contents of the output parameter of the C<read> method
693 will be overwritten by the uncompressed data.
697 =item C<< Strict => 0|1 >>
699 This option controls whether the extra checks defined below are used when
700 carrying out the decompression. When Strict is on, the extra tests are
701 carried out, when Strict is off they are not.
703 The default for this option is off.
709 If the FHCRC bit is set in the gzip FLG header byte, the CRC16 bytes in the
710 header must match the crc16 value of the gzip header actually read.
714 If the gzip header contains a name field (FNAME) it consists solely of ISO
719 If the gzip header contains a comment field (FCOMMENT) it consists solely
720 of ISO 8859-1 characters plus line-feed.
724 If the gzip FEXTRA header field is present it must conform to the sub-field
725 structure as defined in RFC 1952.
729 The CRC32 and ISIZE trailer fields must be present.
733 The value of the CRC32 field read must match the crc32 value of the
734 uncompressed data actually contained in the gzip file.
738 The value of the ISIZE fields read must match the length of the
739 uncompressed data actually read from the file.
743 =item C<< ParseExtra => 0|1 >>
744 If the gzip FEXTRA header field is present and this option is set, it will
745 force the module to check that it conforms to the sub-field structure as
748 If the C<Strict> is on it will automatically enable this option.
764 $status = $z->read($buffer)
766 Reads a block of compressed data (the size the the compressed block is
767 determined by the C<Buffer> option in the constructor), uncompresses it and
768 writes any uncompressed data into C<$buffer>. If the C<Append> parameter is
769 set in the constructor, the uncompressed data will be appended to the
770 C<$buffer> parameter. Otherwise C<$buffer> will be overwritten.
772 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
773 or a negative number on error.
779 $status = $z->read($buffer, $length)
780 $status = $z->read($buffer, $length, $offset)
782 $status = read($z, $buffer, $length)
783 $status = read($z, $buffer, $length, $offset)
785 Attempt to read C<$length> bytes of uncompressed data into C<$buffer>.
787 The main difference between this form of the C<read> method and the
788 previous one, is that this one will attempt to return I<exactly> C<$length>
789 bytes. The only circumstances that this function will not is if end-of-file
790 or an IO error is encountered.
792 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
793 or a negative number on error.
799 $line = $z->getline()
804 This method fully supports the use of of the variable C<$/> (or
805 C<$INPUT_RECORD_SEPARATOR> or C<$RS> when C<English> is in use) to
806 determine what constitutes an end of line. Paragraph mode, record mode and
807 file slurp mode are all supported.
815 Read a single character.
821 $char = $z->ungetc($string)
827 $status = $z->inflateSync()
835 $hdr = $z->getHeaderInfo();
836 @hdrs = $z->getHeaderInfo();
838 This method returns either a hash reference (in scalar context) or a list
839 or hash references (in array context) that contains information about each
840 of the header fields in the compressed data stream(s).
846 The contents of the Name header field, if present. If no name is
847 present, the value will be undef. Note this is different from a zero length
848 name, which will return an empty string.
852 The contents of the Comment header field, if present. If no comment is
853 present, the value will be undef. Note this is different from a zero length
854 comment, which will return an empty string.
865 Returns the uncompressed file offset.
874 Returns true if the end of the compressed input stream has been reached.
878 $z->seek($position, $whence);
879 seek($z, $position, $whence);
881 Provides a sub-set of the C<seek> functionality, with the restriction
882 that it is only legal to seek forward in the input file/buffer.
883 It is a fatal error to attempt to seek backward.
885 The C<$whence> parameter takes one the usual values, namely SEEK_SET,
886 SEEK_CUR or SEEK_END.
888 Returns 1 on success, 0 on failure.
897 This is a noop provided for completeness.
903 Returns true if the object currently refers to a opened file/buffer.
907 my $prev = $z->autoflush()
908 my $prev = $z->autoflush(EXPR)
910 If the C<$z> object is associated with a file or a filehandle, this method
911 returns the current autoflush setting for the underlying filehandle. If
912 C<EXPR> is present, and is non-zero, it will enable flushing after every
913 write/print operation.
915 If C<$z> is associated with a buffer, this method has no effect and always
918 B<Note> that the special variable C<$|> B<cannot> be used to set or
919 retrieve the autoflush setting.
921 =head2 input_line_number
923 $z->input_line_number()
924 $z->input_line_number(EXPR)
926 Returns the current uncompressed line number. If C<EXPR> is present it has
927 the effect of setting the line number. Note that setting the line number
928 does not change the current position within the file/buffer being read.
930 The contents of C<$/> are used to to determine what constitutes a line
938 If the C<$z> object is associated with a file or a filehandle, C<fileno>
939 will return the underlying file descriptor. Once the C<close> method is
940 called C<fileno> will return C<undef>.
942 If the C<$z> object is is associated with a buffer, this method will return
950 Closes the output file/buffer.
952 For most versions of Perl this method will be automatically invoked if
953 the IO::Uncompress::Gunzip object is destroyed (either explicitly or by the
954 variable with the reference to the object going out of scope). The
955 exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
956 these cases, the C<close> method will be called automatically, but
957 not until global destruction of all live objects when the program is
960 Therefore, if you want your scripts to be able to run on all versions
961 of Perl, you should call C<close> explicitly and not rely on automatic
964 Returns true on success, otherwise 0.
966 If the C<AutoClose> option has been enabled when the IO::Uncompress::Gunzip
967 object was created, and the object is associated with a file, the
968 underlying file will also be closed.
974 my $status = $z->nextStream();
976 Skips to the next compressed data stream in the input file/buffer. If a new
977 compressed data stream is found, the eof marker will be cleared and C<$.>
980 Returns 1 if a new stream was found, 0 if none was found, and -1 if an
981 error was encountered.
987 my $data = $z->trailingData();
989 Returns the data, if any, that is present immediately after the compressed
990 data stream once uncompression is complete. It only makes sense to call
991 this method once the end of the compressed data stream has been
994 This option can be used when there is useful information immediately
995 following the compressed data stream, and you don't know the length of the
996 compressed data stream.
998 If the input is a buffer, C<trailingData> will return everything from the
999 end of the compressed data stream to the end of the buffer.
1001 If the input is a filehandle, C<trailingData> will return the data that is
1002 left in the filehandle input buffer once the end of the compressed data
1003 stream has been reached. You can then use the filehandle to read the rest
1006 Don't bother using C<trailingData> if the input is a filename.
1008 If you know the length of the compressed data stream before you start
1009 uncompressing, you can avoid having to use C<trailingData> by setting the
1010 C<InputLength> option in the constructor.
1014 No symbolic constants are required by this IO::Uncompress::Gunzip at present.
1020 Imports C<gunzip> and C<$GunzipError>.
1023 use IO::Uncompress::Gunzip qw(gunzip $GunzipError) ;
1029 =head2 Working with Net::FTP
1031 See L<IO::Uncompress::Gunzip::FAQ|IO::Uncompress::Gunzip::FAQ/"Compressed files and Net::FTP">
1035 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>
1037 L<Compress::Zlib::FAQ|Compress::Zlib::FAQ>
1039 L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
1040 L<Archive::Tar|Archive::Tar>,
1041 L<IO::Zlib|IO::Zlib>
1043 For RFC 1950, 1951 and 1952 see
1044 F<http://www.faqs.org/rfcs/rfc1950.html>,
1045 F<http://www.faqs.org/rfcs/rfc1951.html> and
1046 F<http://www.faqs.org/rfcs/rfc1952.html>
1048 The I<zlib> compression library was written by Jean-loup Gailly
1049 F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>.
1051 The primary site for the I<zlib> compression library is
1052 F<http://www.zlib.org>.
1054 The primary site for gzip is F<http://www.gzip.org>.
1058 This module was written by Paul Marquess, F<pmqs@cpan.org>.
1060 =head1 MODIFICATION HISTORY
1062 See the Changes file.
1064 =head1 COPYRIGHT AND LICENSE
1066 Copyright (c) 2005-2008 Paul Marquess. All rights reserved.
1068 This program is free software; you can redistribute it and/or
1069 modify it under the same terms as Perl itself.