Commit | Line | Data |
25f0751f |
1 | package IO::Compress::RawDeflate ; |
2 | |
3 | # create RFC1951 |
4 | # |
5 | use strict ; |
6 | use warnings; |
7 | use bytes; |
8 | |
9 | |
10 | use IO::Compress::Base; |
11 | use IO::Compress::Base::Common qw(:Status createSelfTiedObject); |
12 | use IO::Compress::Adapter::Deflate ; |
13 | |
14 | require Exporter ; |
15 | |
16 | |
17 | our ($VERSION, @ISA, @EXPORT_OK, %DEFLATE_CONSTANTS, %EXPORT_TAGS, $RawDeflateError); |
18 | |
63ad731d |
19 | $VERSION = '2.001'; |
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20 | $RawDeflateError = ''; |
21 | |
22 | @ISA = qw(Exporter IO::Compress::Base); |
23 | @EXPORT_OK = qw( $RawDeflateError rawdeflate ) ; |
24 | push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ; |
25 | |
26 | %EXPORT_TAGS = ( flush => [qw{ |
27 | Z_NO_FLUSH |
28 | Z_PARTIAL_FLUSH |
29 | Z_SYNC_FLUSH |
30 | Z_FULL_FLUSH |
31 | Z_FINISH |
32 | Z_BLOCK |
33 | }], |
34 | level => [qw{ |
35 | Z_NO_COMPRESSION |
36 | Z_BEST_SPEED |
37 | Z_BEST_COMPRESSION |
38 | Z_DEFAULT_COMPRESSION |
39 | }], |
40 | strategy => [qw{ |
41 | Z_FILTERED |
42 | Z_HUFFMAN_ONLY |
43 | Z_RLE |
44 | Z_FIXED |
45 | Z_DEFAULT_STRATEGY |
46 | }], |
47 | |
48 | ); |
49 | |
50 | { |
51 | my %seen; |
52 | foreach (keys %EXPORT_TAGS ) |
53 | { |
54 | push @{$EXPORT_TAGS{constants}}, |
55 | grep { !$seen{$_}++ } |
56 | @{ $EXPORT_TAGS{$_} } |
57 | } |
58 | $EXPORT_TAGS{all} = $EXPORT_TAGS{constants} ; |
59 | } |
60 | |
61 | %DEFLATE_CONSTANTS = %EXPORT_TAGS; |
62 | |
63 | Exporter::export_ok_tags('all'); |
64 | |
65 | |
66 | |
67 | sub new |
68 | { |
69 | my $class = shift ; |
70 | |
71 | my $obj = createSelfTiedObject($class, \$RawDeflateError); |
72 | |
73 | return $obj->_create(undef, @_); |
74 | } |
75 | |
76 | sub rawdeflate |
77 | { |
78 | my $obj = createSelfTiedObject(undef, \$RawDeflateError); |
79 | return $obj->_def(@_); |
80 | } |
81 | |
82 | sub ckParams |
83 | { |
84 | my $self = shift ; |
85 | my $got = shift; |
86 | |
87 | return 1 ; |
88 | } |
89 | |
90 | sub mkComp |
91 | { |
92 | my $self = shift ; |
93 | my $class = shift ; |
94 | my $got = shift ; |
95 | |
96 | my ($obj, $errstr, $errno) = IO::Compress::Adapter::Deflate::mkCompObject( |
97 | $got->value('CRC32'), |
98 | $got->value('Adler32'), |
99 | $got->value('Level'), |
100 | $got->value('Strategy') |
101 | ); |
102 | |
103 | return $self->saveErrorString(undef, $errstr, $errno) |
104 | if ! defined $obj; |
105 | |
106 | return $obj; |
107 | } |
108 | |
109 | |
110 | sub mkHeader |
111 | { |
112 | my $self = shift ; |
113 | return ''; |
114 | } |
115 | |
116 | sub mkTrailer |
117 | { |
118 | my $self = shift ; |
119 | return ''; |
120 | } |
121 | |
122 | sub mkFinalTrailer |
123 | { |
124 | return ''; |
125 | } |
126 | |
127 | |
128 | #sub newHeader |
129 | #{ |
130 | # my $self = shift ; |
131 | # return ''; |
132 | #} |
133 | |
134 | sub getExtraParams |
135 | { |
136 | my $self = shift ; |
137 | return $self->getZlibParams(); |
138 | } |
139 | |
140 | sub getZlibParams |
141 | { |
142 | my $self = shift ; |
143 | |
144 | use IO::Compress::Base::Common qw(:Parse); |
145 | use Compress::Raw::Zlib qw(Z_DEFLATED Z_DEFAULT_COMPRESSION Z_DEFAULT_STRATEGY); |
146 | |
147 | |
148 | return ( |
149 | |
150 | # zlib behaviour |
151 | #'Method' => [0, 1, Parse_unsigned, Z_DEFLATED], |
152 | 'Level' => [0, 1, Parse_signed, Z_DEFAULT_COMPRESSION], |
153 | 'Strategy' => [0, 1, Parse_signed, Z_DEFAULT_STRATEGY], |
154 | |
155 | 'CRC32' => [0, 1, Parse_boolean, 0], |
156 | 'ADLER32' => [0, 1, Parse_boolean, 0], |
157 | 'Merge' => [1, 1, Parse_boolean, 0], |
158 | ); |
159 | |
160 | |
161 | } |
162 | |
163 | sub getInverseClass |
164 | { |
165 | return ('IO::Uncompress::RawInflate', |
166 | \$IO::Uncompress::RawInflate::RawInflateError); |
167 | } |
168 | |
169 | sub getFileInfo |
170 | { |
171 | my $self = shift ; |
172 | my $params = shift; |
173 | my $file = shift ; |
174 | |
175 | } |
176 | |
177 | use IO::Seekable qw(SEEK_SET); |
178 | |
179 | sub createMerge |
180 | { |
181 | my $self = shift ; |
182 | my $outValue = shift ; |
183 | my $outType = shift ; |
184 | |
185 | my ($invClass, $error_ref) = $self->getInverseClass(); |
186 | eval "require $invClass" |
187 | or die "aaaahhhh" ; |
188 | |
189 | my $inf = $invClass->new( $outValue, |
190 | Transparent => 0, |
191 | #Strict => 1, |
192 | AutoClose => 0, |
193 | Scan => 1) |
194 | or return $self->saveErrorString(undef, "Cannot create InflateScan object: $$error_ref" ) ; |
195 | |
196 | my $end_offset = 0; |
197 | $inf->scan() |
198 | or return $self->saveErrorString(undef, "Error Scanning: $$error_ref", $inf->errorNo) ; |
199 | $inf->zap($end_offset) |
200 | or return $self->saveErrorString(undef, "Error Zapping: $$error_ref", $inf->errorNo) ; |
201 | |
202 | my $def = *$self->{Compress} = $inf->createDeflate(); |
203 | |
204 | *$self->{Header} = *$inf->{Info}{Header}; |
e7d45986 |
205 | *$self->{UnCompSize} = *$inf->{UnCompSize}->clone(); |
206 | *$self->{CompSize} = *$inf->{CompSize}->clone(); |
207 | # TODO -- fix this |
208 | #*$self->{CompSize} = new U64(0, *$self->{UnCompSize_32bit}); |
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209 | |
210 | |
211 | if ( $outType eq 'buffer') |
212 | { substr( ${ *$self->{Buffer} }, $end_offset) = '' } |
213 | elsif ($outType eq 'handle' || $outType eq 'filename') { |
214 | *$self->{FH} = *$inf->{FH} ; |
215 | delete *$inf->{FH}; |
216 | *$self->{FH}->flush() ; |
217 | *$self->{Handle} = 1 if $outType eq 'handle'; |
218 | |
219 | #seek(*$self->{FH}, $end_offset, SEEK_SET) |
220 | *$self->{FH}->seek($end_offset, SEEK_SET) |
221 | or return $self->saveErrorString(undef, $!, $!) ; |
222 | } |
223 | |
224 | return $def ; |
225 | } |
226 | |
227 | #### zlib specific methods |
228 | |
229 | sub deflateParams |
230 | { |
231 | my $self = shift ; |
232 | |
233 | my $level = shift ; |
234 | my $strategy = shift ; |
235 | |
236 | my $status = *$self->{Compress}->deflateParams(Level => $level, Strategy => $strategy) ; |
237 | return $self->saveErrorString(0, *$self->{Compress}{Error}, *$self->{Compress}{ErrorNo}) |
238 | if $status == STATUS_ERROR; |
239 | |
240 | return 1; |
241 | } |
242 | |
243 | |
244 | |
245 | |
246 | 1; |
247 | |
248 | __END__ |
249 | |
250 | =head1 NAME |
251 | |
252 | |
cb7abd7f |
253 | |
254 | IO::Compress::RawDeflate - Write RFC 1951 files/buffers |
255 | |
25f0751f |
256 | |
257 | |
258 | =head1 SYNOPSIS |
259 | |
260 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
261 | |
262 | |
263 | my $status = rawdeflate $input => $output [,OPTS] |
264 | or die "rawdeflate failed: $RawDeflateError\n"; |
265 | |
266 | my $z = new IO::Compress::RawDeflate $output [,OPTS] |
267 | or die "rawdeflate failed: $RawDeflateError\n"; |
268 | |
269 | $z->print($string); |
270 | $z->printf($format, $string); |
271 | $z->write($string); |
272 | $z->syswrite($string [, $length, $offset]); |
273 | $z->flush(); |
274 | $z->tell(); |
275 | $z->eof(); |
276 | $z->seek($position, $whence); |
277 | $z->binmode(); |
278 | $z->fileno(); |
279 | $z->opened(); |
280 | $z->autoflush(); |
281 | $z->input_line_number(); |
282 | $z->newStream( [OPTS] ); |
283 | |
284 | $z->deflateParams(); |
285 | |
286 | $z->close() ; |
287 | |
288 | $RawDeflateError ; |
289 | |
290 | # IO::File mode |
291 | |
292 | print $z $string; |
293 | printf $z $format, $string; |
294 | tell $z |
295 | eof $z |
296 | seek $z, $position, $whence |
297 | binmode $z |
298 | fileno $z |
299 | close $z ; |
300 | |
301 | |
302 | =head1 DESCRIPTION |
303 | |
304 | |
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305 | This module provides a Perl interface that allows writing compressed |
306 | data to files or buffer as defined in RFC 1951. |
307 | |
308 | |
309 | |
310 | |
311 | |
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312 | |
313 | |
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314 | Note that RFC 1951 data is not a good choice of compression format |
315 | to use in isolation, especially if you want to auto-detect it. |
316 | |
317 | |
318 | |
319 | |
320 | |
321 | For reading RFC 1951 files/buffers, see the companion module |
322 | L<IO::Uncompress::RawInflate|IO::Uncompress::RawInflate>. |
323 | |
324 | |
325 | =head1 Functional Interface |
326 | |
327 | A top-level function, C<rawdeflate>, is provided to carry out |
328 | "one-shot" compression between buffers and/or files. For finer |
329 | control over the compression process, see the L</"OO Interface"> |
330 | section. |
331 | |
332 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
333 | |
334 | rawdeflate $input => $output [,OPTS] |
335 | or die "rawdeflate failed: $RawDeflateError\n"; |
336 | |
337 | |
338 | |
339 | The functional interface needs Perl5.005 or better. |
340 | |
341 | |
342 | =head2 rawdeflate $input => $output [, OPTS] |
343 | |
344 | |
345 | C<rawdeflate> expects at least two parameters, C<$input> and C<$output>. |
346 | |
347 | =head3 The C<$input> parameter |
348 | |
349 | The parameter, C<$input>, is used to define the source of |
350 | the uncompressed data. |
351 | |
352 | It can take one of the following forms: |
353 | |
354 | =over 5 |
355 | |
356 | =item A filename |
357 | |
358 | If the C<$input> parameter is a simple scalar, it is assumed to be a |
359 | filename. This file will be opened for reading and the input data |
360 | will be read from it. |
361 | |
362 | =item A filehandle |
363 | |
364 | If the C<$input> parameter is a filehandle, the input data will be |
365 | read from it. |
366 | The string '-' can be used as an alias for standard input. |
367 | |
368 | =item A scalar reference |
369 | |
370 | If C<$input> is a scalar reference, the input data will be read |
371 | from C<$$input>. |
372 | |
373 | =item An array reference |
374 | |
375 | If C<$input> is an array reference, each element in the array must be a |
376 | filename. |
377 | |
378 | The input data will be read from each file in turn. |
379 | |
380 | The complete array will be walked to ensure that it only |
381 | contains valid filenames before any data is compressed. |
382 | |
383 | |
384 | |
385 | =item An Input FileGlob string |
386 | |
387 | If C<$input> is a string that is delimited by the characters "<" and ">" |
388 | C<rawdeflate> will assume that it is an I<input fileglob string>. The |
389 | input is the list of files that match the fileglob. |
390 | |
391 | If the fileglob does not match any files ... |
392 | |
393 | See L<File::GlobMapper|File::GlobMapper> for more details. |
394 | |
395 | |
396 | =back |
397 | |
398 | If the C<$input> parameter is any other type, C<undef> will be returned. |
399 | |
400 | |
401 | |
402 | =head3 The C<$output> parameter |
403 | |
404 | The parameter C<$output> is used to control the destination of the |
405 | compressed data. This parameter can take one of these forms. |
406 | |
407 | =over 5 |
408 | |
409 | =item A filename |
410 | |
411 | If the C<$output> parameter is a simple scalar, it is assumed to be a |
412 | filename. This file will be opened for writing and the compressed |
413 | data will be written to it. |
414 | |
415 | =item A filehandle |
416 | |
417 | If the C<$output> parameter is a filehandle, the compressed data |
418 | will be written to it. |
419 | The string '-' can be used as an alias for standard output. |
420 | |
421 | |
422 | =item A scalar reference |
423 | |
424 | If C<$output> is a scalar reference, the compressed data will be |
425 | stored in C<$$output>. |
426 | |
427 | |
428 | |
429 | =item An Array Reference |
430 | |
431 | If C<$output> is an array reference, the compressed data will be |
432 | pushed onto the array. |
433 | |
434 | =item An Output FileGlob |
435 | |
436 | If C<$output> is a string that is delimited by the characters "<" and ">" |
437 | C<rawdeflate> will assume that it is an I<output fileglob string>. The |
438 | output is the list of files that match the fileglob. |
439 | |
440 | When C<$output> is an fileglob string, C<$input> must also be a fileglob |
441 | string. Anything else is an error. |
442 | |
443 | =back |
444 | |
445 | If the C<$output> parameter is any other type, C<undef> will be returned. |
446 | |
447 | |
448 | |
449 | =head2 Notes |
450 | |
c70c1701 |
451 | |
452 | |
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453 | When C<$input> maps to multiple files/buffers and C<$output> is a single |
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454 | file/buffer the input files/buffers will be stored |
455 | in C<$output> as a concatenated series of compressed data streams. |
456 | |
457 | |
458 | |
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459 | |
460 | |
461 | |
462 | =head2 Optional Parameters |
463 | |
464 | Unless specified below, the optional parameters for C<rawdeflate>, |
465 | C<OPTS>, are the same as those used with the OO interface defined in the |
466 | L</"Constructor Options"> section below. |
467 | |
468 | =over 5 |
469 | |
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470 | =item C<< AutoClose => 0|1 >> |
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471 | |
472 | This option applies to any input or output data streams to |
473 | C<rawdeflate> that are filehandles. |
474 | |
475 | If C<AutoClose> is specified, and the value is true, it will result in all |
476 | input and/or output filehandles being closed once C<rawdeflate> has |
477 | completed. |
478 | |
479 | This parameter defaults to 0. |
480 | |
481 | |
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482 | =item C<< BinModeIn => 0|1 >> |
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483 | |
484 | When reading from a file or filehandle, set C<binmode> before reading. |
485 | |
486 | Defaults to 0. |
487 | |
488 | |
489 | |
490 | |
491 | |
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492 | =item C<< Append => 0|1 >> |
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493 | |
494 | TODO |
495 | |
496 | |
258133d1 |
497 | |
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498 | =back |
499 | |
500 | |
501 | |
502 | =head2 Examples |
503 | |
504 | To read the contents of the file C<file1.txt> and write the compressed |
505 | data to the file C<file1.txt.1951>. |
506 | |
507 | use strict ; |
508 | use warnings ; |
509 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
510 | |
511 | my $input = "file1.txt"; |
512 | rawdeflate $input => "$input.1951" |
513 | or die "rawdeflate failed: $RawDeflateError\n"; |
514 | |
515 | |
516 | To read from an existing Perl filehandle, C<$input>, and write the |
517 | compressed data to a buffer, C<$buffer>. |
518 | |
519 | use strict ; |
520 | use warnings ; |
521 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
522 | use IO::File ; |
523 | |
524 | my $input = new IO::File "<file1.txt" |
525 | or die "Cannot open 'file1.txt': $!\n" ; |
526 | my $buffer ; |
527 | rawdeflate $input => \$buffer |
528 | or die "rawdeflate failed: $RawDeflateError\n"; |
529 | |
530 | To compress all files in the directory "/my/home" that match "*.txt" |
531 | and store the compressed data in the same directory |
532 | |
533 | use strict ; |
534 | use warnings ; |
535 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
536 | |
537 | rawdeflate '</my/home/*.txt>' => '<*.1951>' |
538 | or die "rawdeflate failed: $RawDeflateError\n"; |
539 | |
540 | and if you want to compress each file one at a time, this will do the trick |
541 | |
542 | use strict ; |
543 | use warnings ; |
544 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError) ; |
545 | |
546 | for my $input ( glob "/my/home/*.txt" ) |
547 | { |
548 | my $output = "$input.1951" ; |
549 | rawdeflate $input => $output |
550 | or die "Error compressing '$input': $RawDeflateError\n"; |
551 | } |
552 | |
553 | |
554 | =head1 OO Interface |
555 | |
556 | =head2 Constructor |
557 | |
558 | The format of the constructor for C<IO::Compress::RawDeflate> is shown below |
559 | |
560 | my $z = new IO::Compress::RawDeflate $output [,OPTS] |
561 | or die "IO::Compress::RawDeflate failed: $RawDeflateError\n"; |
562 | |
563 | It returns an C<IO::Compress::RawDeflate> object on success and undef on failure. |
564 | The variable C<$RawDeflateError> will contain an error message on failure. |
565 | |
566 | If you are running Perl 5.005 or better the object, C<$z>, returned from |
567 | IO::Compress::RawDeflate can be used exactly like an L<IO::File|IO::File> filehandle. |
568 | This means that all normal output file operations can be carried out |
569 | with C<$z>. |
570 | For example, to write to a compressed file/buffer you can use either of |
571 | these forms |
572 | |
573 | $z->print("hello world\n"); |
574 | print $z "hello world\n"; |
575 | |
576 | The mandatory parameter C<$output> is used to control the destination |
577 | of the compressed data. This parameter can take one of these forms. |
578 | |
579 | =over 5 |
580 | |
581 | =item A filename |
582 | |
583 | If the C<$output> parameter is a simple scalar, it is assumed to be a |
584 | filename. This file will be opened for writing and the compressed data |
585 | will be written to it. |
586 | |
587 | =item A filehandle |
588 | |
589 | If the C<$output> parameter is a filehandle, the compressed data will be |
590 | written to it. |
591 | The string '-' can be used as an alias for standard output. |
592 | |
593 | |
594 | =item A scalar reference |
595 | |
596 | If C<$output> is a scalar reference, the compressed data will be stored |
597 | in C<$$output>. |
598 | |
599 | =back |
600 | |
601 | If the C<$output> parameter is any other type, C<IO::Compress::RawDeflate>::new will |
602 | return undef. |
603 | |
604 | =head2 Constructor Options |
605 | |
606 | C<OPTS> is any combination of the following options: |
607 | |
608 | =over 5 |
609 | |
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610 | =item C<< AutoClose => 0|1 >> |
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611 | |
612 | This option is only valid when the C<$output> parameter is a filehandle. If |
613 | specified, and the value is true, it will result in the C<$output> being |
614 | closed once either the C<close> method is called or the C<IO::Compress::RawDeflate> |
615 | object is destroyed. |
616 | |
617 | This parameter defaults to 0. |
618 | |
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619 | =item C<< Append => 0|1 >> |
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620 | |
621 | Opens C<$output> in append mode. |
622 | |
623 | The behaviour of this option is dependent on the type of C<$output>. |
624 | |
625 | =over 5 |
626 | |
627 | =item * A Buffer |
628 | |
629 | If C<$output> is a buffer and C<Append> is enabled, all compressed data |
630 | will be append to the end if C<$output>. Otherwise C<$output> will be |
631 | cleared before any data is written to it. |
632 | |
633 | =item * A Filename |
634 | |
635 | If C<$output> is a filename and C<Append> is enabled, the file will be |
636 | opened in append mode. Otherwise the contents of the file, if any, will be |
637 | truncated before any compressed data is written to it. |
638 | |
639 | =item * A Filehandle |
640 | |
641 | If C<$output> is a filehandle, the file pointer will be positioned to the |
642 | end of the file via a call to C<seek> before any compressed data is written |
643 | to it. Otherwise the file pointer will not be moved. |
644 | |
645 | =back |
646 | |
647 | This parameter defaults to 0. |
648 | |
649 | |
650 | |
651 | |
652 | |
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653 | =item C<< Merge => 0|1 >> |
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654 | |
655 | This option is used to compress input data and append it to an existing |
656 | compressed data stream in C<$output>. The end result is a single compressed |
657 | data stream stored in C<$output>. |
658 | |
659 | |
660 | |
661 | It is a fatal error to attempt to use this option when C<$output> is not an |
662 | RFC 1951 data stream. |
663 | |
664 | |
665 | |
666 | There are a number of other limitations with the C<Merge> option: |
667 | |
668 | =over 5 |
669 | |
670 | =item 1 |
671 | |
672 | This module needs to have been built with zlib 1.2.1 or better to work. A |
673 | fatal error will be thrown if C<Merge> is used with an older version of |
674 | zlib. |
675 | |
676 | =item 2 |
677 | |
678 | If C<$output> is a file or a filehandle, it must be seekable. |
679 | |
680 | =back |
681 | |
682 | |
683 | This parameter defaults to 0. |
684 | |
685 | |
686 | |
687 | =item -Level |
688 | |
689 | Defines the compression level used by zlib. The value should either be |
690 | a number between 0 and 9 (0 means no compression and 9 is maximum |
691 | compression), or one of the symbolic constants defined below. |
692 | |
693 | Z_NO_COMPRESSION |
694 | Z_BEST_SPEED |
695 | Z_BEST_COMPRESSION |
696 | Z_DEFAULT_COMPRESSION |
697 | |
698 | The default is Z_DEFAULT_COMPRESSION. |
699 | |
700 | Note, these constants are not imported by C<IO::Compress::RawDeflate> by default. |
701 | |
702 | use IO::Compress::RawDeflate qw(:strategy); |
703 | use IO::Compress::RawDeflate qw(:constants); |
704 | use IO::Compress::RawDeflate qw(:all); |
705 | |
706 | =item -Strategy |
707 | |
708 | Defines the strategy used to tune the compression. Use one of the symbolic |
709 | constants defined below. |
710 | |
711 | Z_FILTERED |
712 | Z_HUFFMAN_ONLY |
713 | Z_RLE |
714 | Z_FIXED |
715 | Z_DEFAULT_STRATEGY |
716 | |
717 | The default is Z_DEFAULT_STRATEGY. |
718 | |
719 | |
720 | |
721 | |
722 | |
723 | |
e7d45986 |
724 | =item C<< Strict => 0|1 >> |
25f0751f |
725 | |
726 | |
727 | |
728 | This is a placeholder option. |
729 | |
730 | |
731 | |
732 | =back |
733 | |
734 | =head2 Examples |
735 | |
736 | TODO |
737 | |
738 | =head1 Methods |
739 | |
740 | =head2 print |
741 | |
742 | Usage is |
743 | |
744 | $z->print($data) |
745 | print $z $data |
746 | |
747 | Compresses and outputs the contents of the C<$data> parameter. This |
748 | has the same behaviour as the C<print> built-in. |
749 | |
750 | Returns true if successful. |
751 | |
752 | =head2 printf |
753 | |
754 | Usage is |
755 | |
756 | $z->printf($format, $data) |
757 | printf $z $format, $data |
758 | |
759 | Compresses and outputs the contents of the C<$data> parameter. |
760 | |
761 | Returns true if successful. |
762 | |
763 | =head2 syswrite |
764 | |
765 | Usage is |
766 | |
767 | $z->syswrite $data |
768 | $z->syswrite $data, $length |
769 | $z->syswrite $data, $length, $offset |
770 | |
771 | Compresses and outputs the contents of the C<$data> parameter. |
772 | |
773 | Returns the number of uncompressed bytes written, or C<undef> if |
774 | unsuccessful. |
775 | |
776 | =head2 write |
777 | |
778 | Usage is |
779 | |
780 | $z->write $data |
781 | $z->write $data, $length |
782 | $z->write $data, $length, $offset |
783 | |
784 | Compresses and outputs the contents of the C<$data> parameter. |
785 | |
786 | Returns the number of uncompressed bytes written, or C<undef> if |
787 | unsuccessful. |
788 | |
789 | =head2 flush |
790 | |
791 | Usage is |
792 | |
793 | |
794 | $z->flush; |
795 | $z->flush($flush_type); |
796 | |
797 | |
798 | Flushes any pending compressed data to the output file/buffer. |
799 | |
800 | |
801 | This method takes an optional parameter, C<$flush_type>, that controls |
802 | how the flushing will be carried out. By default the C<$flush_type> |
803 | used is C<Z_FINISH>. Other valid values for C<$flush_type> are |
804 | C<Z_NO_FLUSH>, C<Z_SYNC_FLUSH>, C<Z_FULL_FLUSH> and C<Z_BLOCK>. It is |
805 | strongly recommended that you only set the C<flush_type> parameter if |
806 | you fully understand the implications of what it does - overuse of C<flush> |
807 | can seriously degrade the level of compression achieved. See the C<zlib> |
808 | documentation for details. |
809 | |
810 | |
811 | Returns true on success. |
812 | |
813 | |
814 | =head2 tell |
815 | |
816 | Usage is |
817 | |
818 | $z->tell() |
819 | tell $z |
820 | |
821 | Returns the uncompressed file offset. |
822 | |
823 | =head2 eof |
824 | |
825 | Usage is |
826 | |
827 | $z->eof(); |
828 | eof($z); |
829 | |
830 | |
831 | |
832 | Returns true if the C<close> method has been called. |
833 | |
834 | |
835 | |
836 | =head2 seek |
837 | |
838 | $z->seek($position, $whence); |
839 | seek($z, $position, $whence); |
840 | |
841 | |
842 | |
843 | |
844 | Provides a sub-set of the C<seek> functionality, with the restriction |
845 | that it is only legal to seek forward in the output file/buffer. |
846 | It is a fatal error to attempt to seek backward. |
847 | |
848 | Empty parts of the file/buffer will have NULL (0x00) bytes written to them. |
849 | |
850 | |
851 | |
852 | The C<$whence> parameter takes one the usual values, namely SEEK_SET, |
853 | SEEK_CUR or SEEK_END. |
854 | |
855 | Returns 1 on success, 0 on failure. |
856 | |
857 | =head2 binmode |
858 | |
859 | Usage is |
860 | |
861 | $z->binmode |
862 | binmode $z ; |
863 | |
864 | This is a noop provided for completeness. |
865 | |
866 | =head2 opened |
867 | |
868 | $z->opened() |
869 | |
870 | Returns true if the object currently refers to a opened file/buffer. |
871 | |
872 | =head2 autoflush |
873 | |
874 | my $prev = $z->autoflush() |
875 | my $prev = $z->autoflush(EXPR) |
876 | |
877 | If the C<$z> object is associated with a file or a filehandle, this method |
878 | returns the current autoflush setting for the underlying filehandle. If |
879 | C<EXPR> is present, and is non-zero, it will enable flushing after every |
880 | write/print operation. |
881 | |
882 | If C<$z> is associated with a buffer, this method has no effect and always |
883 | returns C<undef>. |
884 | |
885 | B<Note> that the special variable C<$|> B<cannot> be used to set or |
886 | retrieve the autoflush setting. |
887 | |
888 | =head2 input_line_number |
889 | |
890 | $z->input_line_number() |
891 | $z->input_line_number(EXPR) |
892 | |
893 | |
894 | This method always returns C<undef> when compressing. |
895 | |
896 | |
897 | |
898 | =head2 fileno |
899 | |
900 | $z->fileno() |
901 | fileno($z) |
902 | |
903 | If the C<$z> object is associated with a file or a filehandle, this method |
904 | will return the underlying file descriptor. |
905 | |
906 | If the C<$z> object is is associated with a buffer, this method will |
907 | return undef. |
908 | |
909 | =head2 close |
910 | |
911 | $z->close() ; |
912 | close $z ; |
913 | |
914 | |
915 | |
916 | Flushes any pending compressed data and then closes the output file/buffer. |
917 | |
918 | |
919 | |
920 | For most versions of Perl this method will be automatically invoked if |
921 | the IO::Compress::RawDeflate object is destroyed (either explicitly or by the |
922 | variable with the reference to the object going out of scope). The |
923 | exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In |
924 | these cases, the C<close> method will be called automatically, but |
925 | not until global destruction of all live objects when the program is |
926 | terminating. |
927 | |
928 | Therefore, if you want your scripts to be able to run on all versions |
929 | of Perl, you should call C<close> explicitly and not rely on automatic |
930 | closing. |
931 | |
932 | Returns true on success, otherwise 0. |
933 | |
934 | If the C<AutoClose> option has been enabled when the IO::Compress::RawDeflate |
935 | object was created, and the object is associated with a file, the |
936 | underlying file will also be closed. |
937 | |
938 | |
939 | |
940 | |
941 | =head2 newStream([OPTS]) |
942 | |
943 | Usage is |
944 | |
945 | $z->newStream( [OPTS] ) |
946 | |
947 | Closes the current compressed data stream and starts a new one. |
948 | |
e7d45986 |
949 | OPTS consists of any of the the options that are available when creating |
950 | the C<$z> object. |
25f0751f |
951 | |
e7d45986 |
952 | See the L</"Constructor Options"> section for more details. |
25f0751f |
953 | |
954 | |
955 | =head2 deflateParams |
956 | |
957 | Usage is |
958 | |
959 | $z->deflateParams |
960 | |
961 | TODO |
962 | |
963 | |
964 | =head1 Importing |
965 | |
966 | |
967 | A number of symbolic constants are required by some methods in |
968 | C<IO::Compress::RawDeflate>. None are imported by default. |
969 | |
970 | |
971 | |
972 | =over 5 |
973 | |
974 | =item :all |
975 | |
976 | |
977 | Imports C<rawdeflate>, C<$RawDeflateError> and all symbolic |
978 | constants that can be used by C<IO::Compress::RawDeflate>. Same as doing this |
979 | |
980 | use IO::Compress::RawDeflate qw(rawdeflate $RawDeflateError :constants) ; |
981 | |
982 | =item :constants |
983 | |
984 | Import all symbolic constants. Same as doing this |
985 | |
2b4e0969 |
986 | |
25f0751f |
987 | use IO::Compress::RawDeflate qw(:flush :level :strategy) ; |
988 | |
2b4e0969 |
989 | |
25f0751f |
990 | =item :flush |
991 | |
992 | These symbolic constants are used by the C<flush> method. |
993 | |
994 | Z_NO_FLUSH |
995 | Z_PARTIAL_FLUSH |
996 | Z_SYNC_FLUSH |
997 | Z_FULL_FLUSH |
998 | Z_FINISH |
999 | Z_BLOCK |
1000 | |
1001 | =item :level |
1002 | |
1003 | These symbolic constants are used by the C<Level> option in the constructor. |
1004 | |
1005 | Z_NO_COMPRESSION |
1006 | Z_BEST_SPEED |
1007 | Z_BEST_COMPRESSION |
1008 | Z_DEFAULT_COMPRESSION |
1009 | |
1010 | |
1011 | =item :strategy |
1012 | |
1013 | These symbolic constants are used by the C<Strategy> option in the constructor. |
1014 | |
1015 | Z_FILTERED |
1016 | Z_HUFFMAN_ONLY |
1017 | Z_RLE |
1018 | Z_FIXED |
1019 | Z_DEFAULT_STRATEGY |
2b4e0969 |
1020 | |
1021 | |
25f0751f |
1022 | |
1023 | |
1024 | =back |
1025 | |
1026 | For |
1027 | |
1028 | =head1 EXAMPLES |
1029 | |
1030 | TODO |
1031 | |
1032 | |
1033 | |
1034 | |
1035 | |
1036 | |
e7d45986 |
1037 | |
1038 | |
1039 | |
1040 | |
1041 | |
25f0751f |
1042 | =head1 SEE ALSO |
1043 | |
258133d1 |
1044 | 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::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Compress::Lzf>, L<IO::Uncompress::UnLzf>, L<IO::Uncompress::AnyInflate>, L<IO::Uncompress::AnyUncompress> |
25f0751f |
1045 | |
1046 | L<Compress::Zlib::FAQ|Compress::Zlib::FAQ> |
1047 | |
1048 | L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>, |
1049 | L<Archive::Tar|Archive::Tar>, |
1050 | L<IO::Zlib|IO::Zlib> |
1051 | |
1052 | |
1053 | For RFC 1950, 1951 and 1952 see |
1054 | F<http://www.faqs.org/rfcs/rfc1950.html>, |
1055 | F<http://www.faqs.org/rfcs/rfc1951.html> and |
1056 | F<http://www.faqs.org/rfcs/rfc1952.html> |
1057 | |
1058 | The I<zlib> compression library was written by Jean-loup Gailly |
1059 | F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>. |
1060 | |
1061 | The primary site for the I<zlib> compression library is |
1062 | F<http://www.zlib.org>. |
1063 | |
1064 | The primary site for gzip is F<http://www.gzip.org>. |
1065 | |
1066 | |
1067 | |
1068 | |
25f0751f |
1069 | =head1 AUTHOR |
1070 | |
cb7abd7f |
1071 | This module was written by Paul Marquess, F<pmqs@cpan.org>. |
25f0751f |
1072 | |
1073 | |
1074 | |
1075 | =head1 MODIFICATION HISTORY |
1076 | |
1077 | See the Changes file. |
1078 | |
1079 | =head1 COPYRIGHT AND LICENSE |
25f0751f |
1080 | |
1081 | Copyright (c) 2005-2006 Paul Marquess. All rights reserved. |
1082 | |
1083 | This program is free software; you can redistribute it and/or |
1084 | modify it under the same terms as Perl itself. |
1085 | |
1086 | |