1 package IO::Uncompress::RawInflate ;
8 use Compress::Raw::Zlib 2.021 ;
9 use IO::Compress::Base::Common 2.021 qw(:Status createSelfTiedObject);
11 use IO::Uncompress::Base 2.021 ;
12 use IO::Uncompress::Adapter::Inflate 2.021 ;
15 our ($VERSION, @ISA, @EXPORT_OK, %EXPORT_TAGS, %DEFLATE_CONSTANTS, $RawInflateError);
18 $RawInflateError = '';
20 @ISA = qw( Exporter IO::Uncompress::Base );
21 @EXPORT_OK = qw( $RawInflateError rawinflate ) ;
22 %DEFLATE_CONSTANTS = ();
23 %EXPORT_TAGS = %IO::Uncompress::Base::EXPORT_TAGS ;
24 push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ;
25 Exporter::export_ok_tags('all');
28 # # Execute at runtime
30 # for my $module (qw(Compress::Raw::Zlib IO::Compress::Base::Common IO::Uncompress::Base IO::Uncompress::Adapter::Inflate))
32 # my $ver = ${ $module . "::VERSION"} ;
34 # $bad{$module} = $ver
35 # if $ver ne $VERSION;
40 # my $string = join "\n", map { "$_ $bad{$_}" } keys %bad;
41 # die caller(0)[0] . "needs version $VERSION mismatch\n$string\n";
48 my $obj = createSelfTiedObject($class, \$RawInflateError);
49 $obj->_create(undef, 0, @_);
54 my $obj = createSelfTiedObject(undef, \$RawInflateError);
55 return $obj->_inf(@_);
76 my ($obj, $errstr, $errno) = IO::Uncompress::Adapter::Inflate::mkUncompObject(
78 $got->value('ADLER32'),
82 return $self->saveErrorString(undef, $errstr, $errno)
85 *$self->{Uncomp} = $obj;
87 my $magic = $self->ckMagic()
90 *$self->{Info} = $self->readHeader($magic)
102 return $self->_isRaw() ;
112 'FingerprintLength' => 0,
114 'TrailerLength' => 0,
128 my $got = $self->_isRawx(@_);
131 *$self->{Pending} = *$self->{HeaderPending} ;
134 $self->pushBack(*$self->{HeaderPending});
135 *$self->{Uncomp}->reset();
137 *$self->{HeaderPending} = '';
147 $magic = '' unless defined $magic ;
151 $self->smartRead(\$buffer, *$self->{BlockSize}) >= 0
152 or return $self->saveErrorString(undef, "No data to read");
154 my $temp_buf = $magic . $buffer ;
155 *$self->{HeaderPending} = $temp_buf ;
157 my $status = *$self->{Uncomp}->uncompr(\$temp_buf, \$buffer, $self->smartEof()) ;
159 return $self->saveErrorString(undef, *$self->{Uncomp}{Error}, STATUS_ERROR)
160 if $status == STATUS_ERROR;
162 $self->pushBack($temp_buf) ;
164 return $self->saveErrorString(undef, "unexpected end of file", STATUS_ERROR)
165 if $self->smartEof() && $status != STATUS_ENDSTREAM;
167 #my $buf_len = *$self->{Uncomp}->uncompressedBytes();
168 my $buf_len = length $buffer;
170 if ($status == STATUS_ENDSTREAM) {
171 if (*$self->{MultiStream}
172 && (length $temp_buf || ! $self->smartEof())){
173 *$self->{NewStream} = 1 ;
174 *$self->{EndStream} = 0 ;
177 *$self->{EndStream} = 1 ;
180 *$self->{HeaderPending} = $buffer ;
181 *$self->{InflatedBytesRead} = $buf_len ;
182 *$self->{TotalInflatedBytesRead} += $buf_len ;
183 *$self->{Type} = 'rfc1951';
185 $self->saveStatus(STATUS_OK);
190 'TrailerLength' => 0,
200 # inflateSync is a no-op in Plain mode
204 return 0 if *$self->{Closed} ;
205 #return G_EOF if !length *$self->{Pending} && *$self->{EndStream} ;
206 return 0 if ! length *$self->{Pending} && *$self->{EndStream} ;
209 *$self->{Strict} = 0 ;
216 if (length *$self->{Pending} )
218 $temp_buf = *$self->{Pending} ;
219 *$self->{Pending} = '';
223 $status = $self->smartRead(\$temp_buf, *$self->{BlockSize}) ;
224 return $self->saveErrorString(0, "Error Reading Data")
228 *$self->{EndStream} = 1 ;
229 return $self->saveErrorString(0, "unexpected end of file", STATUS_ERROR);
233 $status = *$self->{Uncomp}->sync($temp_buf) ;
235 if ($status == STATUS_OK)
237 *$self->{Pending} .= $temp_buf ;
241 last unless $status == STATUS_ERROR ;
252 # my $end_offset = 0;
254 # $status = $self->scan()
255 # #or return $self->saveErrorString(undef, "Error Scanning: $$error_ref", $self->errorNo) ;
256 # or return $self->saveErrorString(G_ERR, "Error Scanning: $status")
258 # $status = $self->zap($end_offset)
259 # or return $self->saveErrorString(G_ERR, "Error Zapping: $status");
260 # #or return $self->saveErrorString(undef, "Error Zapping: $$error_ref", $self->errorNo) ;
262 # #(*$obj->{Deflate}, $status) = $inf->createDeflate();
264 ## *$obj->{Header} = *$inf->{Info}{Header};
265 ## *$obj->{UnCompSize_32bit} =
266 ## *$obj->{BytesWritten} = *$inf->{UnCompSize_32bit} ;
267 ## *$obj->{CompSize_32bit} = *$inf->{CompSize_32bit} ;
270 ## if ( $outType eq 'buffer')
271 ## { substr( ${ *$self->{Buffer} }, $end_offset) = '' }
272 ## elsif ($outType eq 'handle' || $outType eq 'filename') {
273 ## *$self->{FH} = *$inf->{FH} ;
274 ## delete *$inf->{FH};
275 ## *$obj->{FH}->flush() ;
276 ## *$obj->{Handle} = 1 if $outType eq 'handle';
278 ## #seek(*$obj->{FH}, $end_offset, SEEK_SET)
279 ## *$obj->{FH}->seek($end_offset, SEEK_SET)
280 ## or return $obj->saveErrorString(undef, $!, $!) ;
289 return 1 if *$self->{Closed} ;
290 return 1 if !length *$self->{Pending} && *$self->{EndStream} ;
295 $len = $self->_raw_read(\$buffer, 1)
296 while ! *$self->{EndStream} && $len >= 0 ;
298 #return $len if $len < 0 ? $len : 0 ;
299 return $len < 0 ? 0 : 1 ;
306 my $headerLength = *$self->{Info}{HeaderLength};
307 my $block_offset = $headerLength + *$self->{Uncomp}->getLastBlockOffset();
308 $_[0] = $headerLength + *$self->{Uncomp}->getEndOffset();
309 #printf "# End $_[0], headerlen $headerLength \n";;
310 #printf "# block_offset $block_offset %x\n", $block_offset;
312 ( $self->smartSeek($block_offset) &&
313 $self->smartRead(\$byte, 1) )
314 or return $self->saveErrorString(0, $!, $!);
316 #printf "#byte is %x\n", unpack('C*',$byte);
317 *$self->{Uncomp}->resetLastBlockByte($byte);
318 #printf "#to byte is %x\n", unpack('C*',$byte);
320 ( $self->smartSeek($block_offset) &&
321 $self->smartWrite($byte) )
322 or return $self->saveErrorString(0, $!, $!);
324 #$self->smartSeek($end_offset, 1);
332 my ($def, $status) = *$self->{Uncomp}->createDeflateStream(
334 -WindowBits => - MAX_WBITS,
335 -CRC32 => *$self->{Params}->value('CRC32'),
336 -ADLER32 => *$self->{Params}->value('ADLER32'),
339 return wantarray ? ($status, $def) : $def ;
350 IO::Uncompress::RawInflate - Read RFC 1951 files/buffers
354 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
356 my $status = rawinflate $input => $output [,OPTS]
357 or die "rawinflate failed: $RawInflateError\n";
359 my $z = new IO::Uncompress::RawInflate $input [OPTS]
360 or die "rawinflate failed: $RawInflateError\n";
362 $status = $z->read($buffer)
363 $status = $z->read($buffer, $length)
364 $status = $z->read($buffer, $length, $offset)
365 $line = $z->getline()
370 $status = $z->inflateSync()
372 $data = $z->trailingData()
373 $status = $z->nextStream()
374 $data = $z->getHeaderInfo()
376 $z->seek($position, $whence)
388 read($z, $buffer, $length);
389 read($z, $buffer, $length, $offset);
391 seek($z, $position, $whence)
399 This module provides a Perl interface that allows the reading of
400 files/buffers that conform to RFC 1951.
402 For writing RFC 1951 files/buffers, see the companion module IO::Compress::RawDeflate.
404 =head1 Functional Interface
406 A top-level function, C<rawinflate>, is provided to carry out
407 "one-shot" uncompression between buffers and/or files. For finer
408 control over the uncompression process, see the L</"OO Interface">
411 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
413 rawinflate $input => $output [,OPTS]
414 or die "rawinflate failed: $RawInflateError\n";
416 The functional interface needs Perl5.005 or better.
418 =head2 rawinflate $input => $output [, OPTS]
420 C<rawinflate> expects at least two parameters, C<$input> and C<$output>.
422 =head3 The C<$input> parameter
424 The parameter, C<$input>, is used to define the source of
427 It can take one of the following forms:
433 If the C<$input> parameter is a simple scalar, it is assumed to be a
434 filename. This file will be opened for reading and the input data
435 will be read from it.
439 If the C<$input> parameter is a filehandle, the input data will be
441 The string '-' can be used as an alias for standard input.
443 =item A scalar reference
445 If C<$input> is a scalar reference, the input data will be read
448 =item An array reference
450 If C<$input> is an array reference, each element in the array must be a
453 The input data will be read from each file in turn.
455 The complete array will be walked to ensure that it only
456 contains valid filenames before any data is uncompressed.
458 =item An Input FileGlob string
460 If C<$input> is a string that is delimited by the characters "<" and ">"
461 C<rawinflate> will assume that it is an I<input fileglob string>. The
462 input is the list of files that match the fileglob.
464 If the fileglob does not match any files ...
466 See L<File::GlobMapper|File::GlobMapper> for more details.
470 If the C<$input> parameter is any other type, C<undef> will be returned.
472 =head3 The C<$output> parameter
474 The parameter C<$output> is used to control the destination of the
475 uncompressed data. This parameter can take one of these forms.
481 If the C<$output> parameter is a simple scalar, it is assumed to be a
482 filename. This file will be opened for writing and the uncompressed
483 data will be written to it.
487 If the C<$output> parameter is a filehandle, the uncompressed data
488 will be written to it.
489 The string '-' can be used as an alias for standard output.
491 =item A scalar reference
493 If C<$output> is a scalar reference, the uncompressed data will be
494 stored in C<$$output>.
496 =item An Array Reference
498 If C<$output> is an array reference, the uncompressed data will be
499 pushed onto the array.
501 =item An Output FileGlob
503 If C<$output> is a string that is delimited by the characters "<" and ">"
504 C<rawinflate> will assume that it is an I<output fileglob string>. The
505 output is the list of files that match the fileglob.
507 When C<$output> is an fileglob string, C<$input> must also be a fileglob
508 string. Anything else is an error.
512 If the C<$output> parameter is any other type, C<undef> will be returned.
516 When C<$input> maps to multiple compressed files/buffers and C<$output> is
517 a single file/buffer, after uncompression C<$output> will contain a
518 concatenation of all the uncompressed data from each of the input
521 =head2 Optional Parameters
523 Unless specified below, the optional parameters for C<rawinflate>,
524 C<OPTS>, are the same as those used with the OO interface defined in the
525 L</"Constructor Options"> section below.
529 =item C<< AutoClose => 0|1 >>
531 This option applies to any input or output data streams to
532 C<rawinflate> that are filehandles.
534 If C<AutoClose> is specified, and the value is true, it will result in all
535 input and/or output filehandles being closed once C<rawinflate> has
538 This parameter defaults to 0.
540 =item C<< BinModeOut => 0|1 >>
542 When writing to a file or filehandle, set C<binmode> before writing to the
547 =item C<< Append => 0|1 >>
551 =item C<< MultiStream => 0|1 >>
553 This option is a no-op.
555 =item C<< TrailingData => $scalar >>
557 Returns the data, if any, that is present immediately after the compressed
558 data stream once uncompression is complete.
560 This option can be used when there is useful information immediately
561 following the compressed data stream, and you don't know the length of the
562 compressed data stream.
564 If the input is a buffer, C<trailingData> will return everything from the
565 end of the compressed data stream to the end of the buffer.
567 If the input is a filehandle, C<trailingData> will return the data that is
568 left in the filehandle input buffer once the end of the compressed data
569 stream has been reached. You can then use the filehandle to read the rest
572 Don't bother using C<trailingData> if the input is a filename.
574 If you know the length of the compressed data stream before you start
575 uncompressing, you can avoid having to use C<trailingData> by setting the
576 C<InputLength> option.
582 To read the contents of the file C<file1.txt.1951> and write the
583 uncompressed data to the file C<file1.txt>.
587 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
589 my $input = "file1.txt.1951";
590 my $output = "file1.txt";
591 rawinflate $input => $output
592 or die "rawinflate failed: $RawInflateError\n";
594 To read from an existing Perl filehandle, C<$input>, and write the
595 uncompressed data to a buffer, C<$buffer>.
599 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
602 my $input = new IO::File "<file1.txt.1951"
603 or die "Cannot open 'file1.txt.1951': $!\n" ;
605 rawinflate $input => \$buffer
606 or die "rawinflate failed: $RawInflateError\n";
608 To uncompress all files in the directory "/my/home" that match "*.txt.1951" and store the compressed data in the same directory
612 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
614 rawinflate '</my/home/*.txt.1951>' => '</my/home/#1.txt>'
615 or die "rawinflate failed: $RawInflateError\n";
617 and if you want to compress each file one at a time, this will do the trick
621 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
623 for my $input ( glob "/my/home/*.txt.1951" )
626 $output =~ s/.1951// ;
627 rawinflate $input => $output
628 or die "Error compressing '$input': $RawInflateError\n";
635 The format of the constructor for IO::Uncompress::RawInflate is shown below
637 my $z = new IO::Uncompress::RawInflate $input [OPTS]
638 or die "IO::Uncompress::RawInflate failed: $RawInflateError\n";
640 Returns an C<IO::Uncompress::RawInflate> object on success and undef on failure.
641 The variable C<$RawInflateError> will contain an error message on failure.
643 If you are running Perl 5.005 or better the object, C<$z>, returned from
644 IO::Uncompress::RawInflate can be used exactly like an L<IO::File|IO::File> filehandle.
645 This means that all normal input file operations can be carried out with
646 C<$z>. For example, to read a line from a compressed file/buffer you can
647 use either of these forms
649 $line = $z->getline();
652 The mandatory parameter C<$input> is used to determine the source of the
653 compressed data. This parameter can take one of three forms.
659 If the C<$input> parameter is a scalar, it is assumed to be a filename. This
660 file will be opened for reading and the compressed data will be read from it.
664 If the C<$input> parameter is a filehandle, the compressed data will be
666 The string '-' can be used as an alias for standard input.
668 =item A scalar reference
670 If C<$input> is a scalar reference, the compressed data will be read from
675 =head2 Constructor Options
677 The option names defined below are case insensitive and can be optionally
678 prefixed by a '-'. So all of the following are valid
685 OPTS is a combination of the following options:
689 =item C<< AutoClose => 0|1 >>
691 This option is only valid when the C<$input> parameter is a filehandle. If
692 specified, and the value is true, it will result in the file being closed once
693 either the C<close> method is called or the IO::Uncompress::RawInflate object is
696 This parameter defaults to 0.
698 =item C<< MultiStream => 0|1 >>
700 Allows multiple concatenated compressed streams to be treated as a single
701 compressed stream. Decompression will stop once either the end of the
702 file/buffer is reached, an error is encountered (premature eof, corrupt
703 compressed data) or the end of a stream is not immediately followed by the
704 start of another stream.
706 This parameter defaults to 0.
708 =item C<< Prime => $string >>
710 This option will uncompress the contents of C<$string> before processing the
713 This option can be useful when the compressed data is embedded in another
714 file/data structure and it is not possible to work out where the compressed
715 data begins without having to read the first few bytes. If this is the
716 case, the uncompression can be I<primed> with these bytes using this
719 =item C<< Transparent => 0|1 >>
721 If this option is set and the input file/buffer is not compressed data,
722 the module will allow reading of it anyway.
724 In addition, if the input file/buffer does contain compressed data and
725 there is non-compressed data immediately following it, setting this option
726 will make this module treat the whole file/bufffer as a single data stream.
728 This option defaults to 1.
730 =item C<< BlockSize => $num >>
732 When reading the compressed input data, IO::Uncompress::RawInflate will read it in
733 blocks of C<$num> bytes.
735 This option defaults to 4096.
737 =item C<< InputLength => $size >>
739 When present this option will limit the number of compressed bytes read
740 from the input file/buffer to C<$size>. This option can be used in the
741 situation where there is useful data directly after the compressed data
742 stream and you know beforehand the exact length of the compressed data
745 This option is mostly used when reading from a filehandle, in which case
746 the file pointer will be left pointing to the first byte directly after the
747 compressed data stream.
749 This option defaults to off.
751 =item C<< Append => 0|1 >>
753 This option controls what the C<read> method does with uncompressed data.
755 If set to 1, all uncompressed data will be appended to the output parameter
756 of the C<read> method.
758 If set to 0, the contents of the output parameter of the C<read> method
759 will be overwritten by the uncompressed data.
763 =item C<< Strict => 0|1 >>
765 This option is a no-op.
779 $status = $z->read($buffer)
781 Reads a block of compressed data (the size the the compressed block is
782 determined by the C<Buffer> option in the constructor), uncompresses it and
783 writes any uncompressed data into C<$buffer>. If the C<Append> parameter is
784 set in the constructor, the uncompressed data will be appended to the
785 C<$buffer> parameter. Otherwise C<$buffer> will be overwritten.
787 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
788 or a negative number on error.
794 $status = $z->read($buffer, $length)
795 $status = $z->read($buffer, $length, $offset)
797 $status = read($z, $buffer, $length)
798 $status = read($z, $buffer, $length, $offset)
800 Attempt to read C<$length> bytes of uncompressed data into C<$buffer>.
802 The main difference between this form of the C<read> method and the
803 previous one, is that this one will attempt to return I<exactly> C<$length>
804 bytes. The only circumstances that this function will not is if end-of-file
805 or an IO error is encountered.
807 Returns the number of uncompressed bytes written to C<$buffer>, zero if eof
808 or a negative number on error.
814 $line = $z->getline()
819 This method fully supports the use of of the variable C<$/> (or
820 C<$INPUT_RECORD_SEPARATOR> or C<$RS> when C<English> is in use) to
821 determine what constitutes an end of line. Paragraph mode, record mode and
822 file slurp mode are all supported.
830 Read a single character.
836 $char = $z->ungetc($string)
842 $status = $z->inflateSync()
850 $hdr = $z->getHeaderInfo();
851 @hdrs = $z->getHeaderInfo();
853 This method returns either a hash reference (in scalar context) or a list
854 or hash references (in array context) that contains information about each
855 of the header fields in the compressed data stream(s).
864 Returns the uncompressed file offset.
873 Returns true if the end of the compressed input stream has been reached.
877 $z->seek($position, $whence);
878 seek($z, $position, $whence);
880 Provides a sub-set of the C<seek> functionality, with the restriction
881 that it is only legal to seek forward in the input file/buffer.
882 It is a fatal error to attempt to seek backward.
884 The C<$whence> parameter takes one the usual values, namely SEEK_SET,
885 SEEK_CUR or SEEK_END.
887 Returns 1 on success, 0 on failure.
896 This is a noop provided for completeness.
902 Returns true if the object currently refers to a opened file/buffer.
906 my $prev = $z->autoflush()
907 my $prev = $z->autoflush(EXPR)
909 If the C<$z> object is associated with a file or a filehandle, this method
910 returns the current autoflush setting for the underlying filehandle. If
911 C<EXPR> is present, and is non-zero, it will enable flushing after every
912 write/print operation.
914 If C<$z> is associated with a buffer, this method has no effect and always
917 B<Note> that the special variable C<$|> B<cannot> be used to set or
918 retrieve the autoflush setting.
920 =head2 input_line_number
922 $z->input_line_number()
923 $z->input_line_number(EXPR)
925 Returns the current uncompressed line number. If C<EXPR> is present it has
926 the effect of setting the line number. Note that setting the line number
927 does not change the current position within the file/buffer being read.
929 The contents of C<$/> are used to to determine what constitutes a line
937 If the C<$z> object is associated with a file or a filehandle, C<fileno>
938 will return the underlying file descriptor. Once the C<close> method is
939 called C<fileno> will return C<undef>.
941 If the C<$z> object is is associated with a buffer, this method will return
949 Closes the output file/buffer.
951 For most versions of Perl this method will be automatically invoked if
952 the IO::Uncompress::RawInflate object is destroyed (either explicitly or by the
953 variable with the reference to the object going out of scope). The
954 exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In
955 these cases, the C<close> method will be called automatically, but
956 not until global destruction of all live objects when the program is
959 Therefore, if you want your scripts to be able to run on all versions
960 of Perl, you should call C<close> explicitly and not rely on automatic
963 Returns true on success, otherwise 0.
965 If the C<AutoClose> option has been enabled when the IO::Uncompress::RawInflate
966 object was created, and the object is associated with a file, the
967 underlying file will also be closed.
973 my $status = $z->nextStream();
975 Skips to the next compressed data stream in the input file/buffer. If a new
976 compressed data stream is found, the eof marker will be cleared and C<$.>
979 Returns 1 if a new stream was found, 0 if none was found, and -1 if an
980 error was encountered.
986 my $data = $z->trailingData();
988 Returns the data, if any, that is present immediately after the compressed
989 data stream once uncompression is complete. It only makes sense to call
990 this method once the end of the compressed data stream has been
993 This option can be used when there is useful information immediately
994 following the compressed data stream, and you don't know the length of the
995 compressed data stream.
997 If the input is a buffer, C<trailingData> will return everything from the
998 end of the compressed data stream to the end of the buffer.
1000 If the input is a filehandle, C<trailingData> will return the data that is
1001 left in the filehandle input buffer once the end of the compressed data
1002 stream has been reached. You can then use the filehandle to read the rest
1005 Don't bother using C<trailingData> if the input is a filename.
1007 If you know the length of the compressed data stream before you start
1008 uncompressing, you can avoid having to use C<trailingData> by setting the
1009 C<InputLength> option in the constructor.
1013 No symbolic constants are required by this IO::Uncompress::RawInflate at present.
1019 Imports C<rawinflate> and C<$RawInflateError>.
1022 use IO::Uncompress::RawInflate qw(rawinflate $RawInflateError) ;
1028 =head2 Working with Net::FTP
1030 See L<IO::Uncompress::RawInflate::FAQ|IO::Uncompress::RawInflate::FAQ/"Compressed files and Net::FTP">
1034 L<Compress::Zlib>, L<IO::Compress::Gzip>, L<IO::Uncompress::Gunzip>, L<IO::Compress::Deflate>, L<IO::Uncompress::Inflate>, L<IO::Compress::RawDeflate>, L<IO::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>
1036 L<Compress::Zlib::FAQ|Compress::Zlib::FAQ>
1038 L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>,
1039 L<Archive::Tar|Archive::Tar>,
1040 L<IO::Zlib|IO::Zlib>
1042 For RFC 1950, 1951 and 1952 see
1043 F<http://www.faqs.org/rfcs/rfc1950.html>,
1044 F<http://www.faqs.org/rfcs/rfc1951.html> and
1045 F<http://www.faqs.org/rfcs/rfc1952.html>
1047 The I<zlib> compression library was written by Jean-loup Gailly
1048 F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>.
1050 The primary site for the I<zlib> compression library is
1051 F<http://www.zlib.org>.
1053 The primary site for gzip is F<http://www.gzip.org>.
1057 This module was written by Paul Marquess, F<pmqs@cpan.org>.
1059 =head1 MODIFICATION HISTORY
1061 See the Changes file.
1063 =head1 COPYRIGHT AND LICENSE
1065 Copyright (c) 2005-2009 Paul Marquess. All rights reserved.
1067 This program is free software; you can redistribute it and/or
1068 modify it under the same terms as Perl itself.