Commit | Line | Data |
642e522c |
1 | package IO::Uncompress::AnyInflate ; |
2 | |
3 | # for RFC1950, RFC1951 or RFC1952 |
4 | |
5 | use strict; |
6 | use warnings; |
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7 | use bytes; |
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8 | |
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9 | use IO::Compress::Base::Common qw(createSelfTiedObject); |
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10 | |
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11 | use IO::Uncompress::Adapter::Inflate (); |
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12 | |
13 | |
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14 | use IO::Uncompress::Base ; |
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15 | use IO::Uncompress::Gunzip ; |
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16 | use IO::Uncompress::Inflate ; |
17 | use IO::Uncompress::RawInflate ; |
18 | use IO::Uncompress::Unzip ; |
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19 | |
20 | require Exporter ; |
21 | |
22 | our ($VERSION, @ISA, @EXPORT_OK, %EXPORT_TAGS, $AnyInflateError); |
23 | |
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24 | $VERSION = '2.000_13'; |
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25 | $AnyInflateError = ''; |
26 | |
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27 | @ISA = qw( Exporter IO::Uncompress::Base ); |
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28 | @EXPORT_OK = qw( $AnyInflateError anyinflate ) ; |
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29 | %EXPORT_TAGS = %IO::Uncompress::Base::DEFLATE_CONSTANTS ; |
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30 | push @{ $EXPORT_TAGS{all} }, @EXPORT_OK ; |
31 | Exporter::export_ok_tags('all'); |
32 | |
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33 | # TODO - allow the user to pick a set of the three formats to allow |
34 | # or just assume want to auto-detect any of the three formats. |
35 | |
36 | sub new |
37 | { |
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38 | my $class = shift ; |
39 | my $obj = createSelfTiedObject($class, \$AnyInflateError); |
40 | $obj->_create(undef, 0, @_); |
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41 | } |
42 | |
43 | sub anyinflate |
44 | { |
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45 | my $obj = createSelfTiedObject(undef, \$AnyInflateError); |
46 | return $obj->_inf(@_) ; |
47 | } |
48 | |
49 | sub getExtraParams |
50 | { |
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51 | use IO::Compress::Base::Common qw(:Parse); |
52 | return ( 'RawInflate' => [1, 1, Parse_boolean, 0] ) ; |
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53 | } |
54 | |
55 | sub ckParams |
56 | { |
57 | my $self = shift ; |
58 | my $got = shift ; |
59 | |
60 | # any always needs both crc32 and adler32 |
61 | $got->value('CRC32' => 1); |
62 | $got->value('ADLER32' => 1); |
63 | |
64 | return 1; |
65 | } |
66 | |
67 | sub mkUncomp |
68 | { |
69 | my $self = shift ; |
70 | my $class = shift ; |
71 | my $got = shift ; |
72 | |
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73 | my ($obj, $errstr, $errno) = IO::Uncompress::Adapter::Inflate::mkUncompObject(); |
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74 | |
75 | return $self->saveErrorString(undef, $errstr, $errno) |
76 | if ! defined $obj; |
77 | |
78 | *$self->{Uncomp} = $obj; |
79 | |
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80 | my @possible = qw( Inflate Gunzip Unzip ); |
81 | unshift @possible, 'RawInflate' |
82 | if 1 || $got->value('RawInflate'); |
83 | |
84 | my $magic = $self->ckMagic( @possible ); |
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85 | |
86 | if ($magic) { |
87 | *$self->{Info} = $self->readHeader($magic) |
88 | or return undef ; |
89 | |
90 | return 1; |
91 | } |
92 | |
93 | return 0 ; |
94 | } |
95 | |
96 | |
97 | |
98 | sub ckMagic |
99 | { |
100 | my $self = shift; |
101 | my @names = @_ ; |
102 | |
103 | my $keep = ref $self ; |
104 | for my $class ( map { "IO::Uncompress::$_" } @names) |
105 | { |
106 | bless $self => $class; |
107 | my $magic = $self->ckMagic(); |
108 | |
109 | if ($magic) |
110 | { |
111 | #bless $self => $class; |
112 | return $magic ; |
113 | } |
114 | |
115 | $self->pushBack(*$self->{HeaderPending}) ; |
116 | *$self->{HeaderPending} = '' ; |
117 | } |
118 | |
119 | bless $self => $keep; |
120 | return undef; |
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121 | } |
122 | |
123 | 1 ; |
124 | |
125 | __END__ |
126 | |
127 | |
128 | =head1 NAME |
129 | |
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130 | |
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131 | IO::Uncompress::AnyInflate - Uncompress zlib-based (zip, gzip) file/buffer |
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132 | |
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133 | |
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134 | =head1 SYNOPSIS |
135 | |
136 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
137 | |
138 | my $status = anyinflate $input => $output [,OPTS] |
139 | or die "anyinflate failed: $AnyInflateError\n"; |
140 | |
141 | my $z = new IO::Uncompress::AnyInflate $input [OPTS] |
142 | or die "anyinflate failed: $AnyInflateError\n"; |
143 | |
144 | $status = $z->read($buffer) |
145 | $status = $z->read($buffer, $length) |
146 | $status = $z->read($buffer, $length, $offset) |
147 | $line = $z->getline() |
148 | $char = $z->getc() |
149 | $char = $z->ungetc() |
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150 | $char = $z->opened() |
151 | |
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152 | $status = $z->inflateSync() |
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153 | |
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154 | $data = $z->trailingData() |
155 | $status = $z->nextStream() |
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156 | $data = $z->getHeaderInfo() |
157 | $z->tell() |
158 | $z->seek($position, $whence) |
159 | $z->binmode() |
160 | $z->fileno() |
161 | $z->eof() |
162 | $z->close() |
163 | |
164 | $AnyInflateError ; |
165 | |
166 | # IO::File mode |
167 | |
168 | <$z> |
169 | read($z, $buffer); |
170 | read($z, $buffer, $length); |
171 | read($z, $buffer, $length, $offset); |
172 | tell($z) |
173 | seek($z, $position, $whence) |
174 | binmode($z) |
175 | fileno($z) |
176 | eof($z) |
177 | close($z) |
178 | |
179 | |
180 | =head1 DESCRIPTION |
181 | |
182 | |
183 | |
184 | B<WARNING -- This is a Beta release>. |
185 | |
186 | =over 5 |
187 | |
188 | =item * DO NOT use in production code. |
189 | |
190 | =item * The documentation is incomplete in places. |
191 | |
192 | =item * Parts of the interface defined here are tentative. |
193 | |
194 | =item * Please report any problems you find. |
195 | |
196 | =back |
197 | |
198 | |
199 | |
200 | |
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201 | This module provides a Perl interface that allows the reading of |
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202 | files/buffers that have been compressed in a number of formats that use the |
203 | zlib compression library. |
204 | |
205 | The formats supported are |
206 | |
207 | =over 5 |
208 | |
209 | =item RFC 1950 |
210 | |
211 | =item RFC 1951 |
212 | |
213 | =item gzip (RFC 1952) |
214 | |
215 | =item zip |
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216 | |
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217 | =back |
218 | |
219 | The module will auto-detect which, if any, of the supported |
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220 | compression formats is being used. |
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221 | |
222 | |
223 | |
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224 | |
225 | |
226 | |
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227 | =head1 Functional Interface |
228 | |
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229 | A top-level function, C<anyinflate>, is provided to carry out |
230 | "one-shot" uncompression between buffers and/or files. For finer |
231 | control over the uncompression process, see the L</"OO Interface"> |
232 | section. |
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233 | |
234 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
235 | |
236 | anyinflate $input => $output [,OPTS] |
237 | or die "anyinflate failed: $AnyInflateError\n"; |
238 | |
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239 | |
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240 | |
241 | The functional interface needs Perl5.005 or better. |
242 | |
243 | |
244 | =head2 anyinflate $input => $output [, OPTS] |
245 | |
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246 | |
247 | C<anyinflate> expects at least two parameters, C<$input> and C<$output>. |
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248 | |
249 | =head3 The C<$input> parameter |
250 | |
251 | The parameter, C<$input>, is used to define the source of |
252 | the compressed data. |
253 | |
254 | It can take one of the following forms: |
255 | |
256 | =over 5 |
257 | |
258 | =item A filename |
259 | |
260 | If the C<$input> parameter is a simple scalar, it is assumed to be a |
261 | filename. This file will be opened for reading and the input data |
262 | will be read from it. |
263 | |
264 | =item A filehandle |
265 | |
266 | If the C<$input> parameter is a filehandle, the input data will be |
267 | read from it. |
268 | The string '-' can be used as an alias for standard input. |
269 | |
270 | =item A scalar reference |
271 | |
272 | If C<$input> is a scalar reference, the input data will be read |
273 | from C<$$input>. |
274 | |
275 | =item An array reference |
276 | |
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277 | If C<$input> is an array reference, each element in the array must be a |
278 | filename. |
279 | |
280 | The input data will be read from each file in turn. |
281 | |
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282 | The complete array will be walked to ensure that it only |
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283 | contains valid filenames before any data is uncompressed. |
284 | |
285 | |
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286 | |
287 | =item An Input FileGlob string |
288 | |
289 | If C<$input> is a string that is delimited by the characters "<" and ">" |
290 | C<anyinflate> will assume that it is an I<input fileglob string>. The |
291 | input is the list of files that match the fileglob. |
292 | |
293 | If the fileglob does not match any files ... |
294 | |
295 | See L<File::GlobMapper|File::GlobMapper> for more details. |
296 | |
297 | |
298 | =back |
299 | |
300 | If the C<$input> parameter is any other type, C<undef> will be returned. |
301 | |
302 | |
303 | |
304 | =head3 The C<$output> parameter |
305 | |
306 | The parameter C<$output> is used to control the destination of the |
307 | uncompressed data. This parameter can take one of these forms. |
308 | |
309 | =over 5 |
310 | |
311 | =item A filename |
312 | |
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313 | If the C<$output> parameter is a simple scalar, it is assumed to be a |
314 | filename. This file will be opened for writing and the uncompressed |
315 | data will be written to it. |
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316 | |
317 | =item A filehandle |
318 | |
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319 | If the C<$output> parameter is a filehandle, the uncompressed data |
320 | will be written to it. |
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321 | The string '-' can be used as an alias for standard output. |
322 | |
323 | |
324 | =item A scalar reference |
325 | |
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326 | If C<$output> is a scalar reference, the uncompressed data will be |
327 | stored in C<$$output>. |
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328 | |
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329 | |
330 | |
331 | =item An Array Reference |
332 | |
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333 | If C<$output> is an array reference, the uncompressed data will be |
334 | pushed onto the array. |
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335 | |
336 | =item An Output FileGlob |
337 | |
338 | If C<$output> is a string that is delimited by the characters "<" and ">" |
339 | C<anyinflate> will assume that it is an I<output fileglob string>. The |
340 | output is the list of files that match the fileglob. |
341 | |
342 | When C<$output> is an fileglob string, C<$input> must also be a fileglob |
343 | string. Anything else is an error. |
344 | |
345 | =back |
346 | |
347 | If the C<$output> parameter is any other type, C<undef> will be returned. |
348 | |
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349 | |
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350 | |
351 | =head2 Notes |
352 | |
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353 | |
354 | When C<$input> maps to multiple compressed files/buffers and C<$output> is |
355 | a single file/buffer, after uncompression C<$output> will contain a |
356 | concatenation of all the uncompressed data from each of the input |
357 | files/buffers. |
358 | |
359 | |
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360 | |
361 | |
362 | |
363 | =head2 Optional Parameters |
364 | |
365 | Unless specified below, the optional parameters for C<anyinflate>, |
366 | C<OPTS>, are the same as those used with the OO interface defined in the |
367 | L</"Constructor Options"> section below. |
368 | |
369 | =over 5 |
370 | |
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371 | =item C<< AutoClose => 0|1 >> |
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372 | |
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373 | This option applies to any input or output data streams to |
374 | C<anyinflate> that are filehandles. |
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375 | |
376 | If C<AutoClose> is specified, and the value is true, it will result in all |
377 | input and/or output filehandles being closed once C<anyinflate> has |
378 | completed. |
379 | |
380 | This parameter defaults to 0. |
381 | |
382 | |
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383 | =item C<< BinModeOut => 0|1 >> |
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384 | |
385 | When writing to a file or filehandle, set C<binmode> before writing to the |
386 | file. |
387 | |
388 | Defaults to 0. |
389 | |
390 | |
391 | |
392 | |
393 | |
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394 | =item C<< Append => 0|1 >> |
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395 | |
396 | TODO |
397 | |
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398 | =item C<< MultiStream => 0|1 >> |
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399 | |
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400 | If the input file/buffer contains multiple compressed data streams, this |
401 | option will uncompress the whole lot as a single data stream. |
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402 | |
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403 | Defaults to 0. |
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404 | |
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405 | |
406 | |
407 | =back |
408 | |
409 | |
410 | |
411 | |
412 | =head2 Examples |
413 | |
414 | To read the contents of the file C<file1.txt.Compressed> and write the |
415 | compressed data to the file C<file1.txt>. |
416 | |
417 | use strict ; |
418 | use warnings ; |
419 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
420 | |
421 | my $input = "file1.txt.Compressed"; |
422 | my $output = "file1.txt"; |
423 | anyinflate $input => $output |
424 | or die "anyinflate failed: $AnyInflateError\n"; |
425 | |
426 | |
427 | To read from an existing Perl filehandle, C<$input>, and write the |
428 | uncompressed data to a buffer, C<$buffer>. |
429 | |
430 | use strict ; |
431 | use warnings ; |
432 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
433 | use IO::File ; |
434 | |
435 | my $input = new IO::File "<file1.txt.Compressed" |
436 | or die "Cannot open 'file1.txt.Compressed': $!\n" ; |
437 | my $buffer ; |
438 | anyinflate $input => \$buffer |
439 | or die "anyinflate failed: $AnyInflateError\n"; |
440 | |
441 | To uncompress all files in the directory "/my/home" that match "*.txt.Compressed" and store the compressed data in the same directory |
442 | |
443 | use strict ; |
444 | use warnings ; |
445 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
446 | |
447 | anyinflate '</my/home/*.txt.Compressed>' => '</my/home/#1.txt>' |
448 | or die "anyinflate failed: $AnyInflateError\n"; |
449 | |
450 | and if you want to compress each file one at a time, this will do the trick |
451 | |
452 | use strict ; |
453 | use warnings ; |
454 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
455 | |
456 | for my $input ( glob "/my/home/*.txt.Compressed" ) |
457 | { |
458 | my $output = $input; |
459 | $output =~ s/.Compressed// ; |
460 | anyinflate $input => $output |
461 | or die "Error compressing '$input': $AnyInflateError\n"; |
462 | } |
463 | |
464 | =head1 OO Interface |
465 | |
466 | =head2 Constructor |
467 | |
468 | The format of the constructor for IO::Uncompress::AnyInflate is shown below |
469 | |
470 | |
471 | my $z = new IO::Uncompress::AnyInflate $input [OPTS] |
472 | or die "IO::Uncompress::AnyInflate failed: $AnyInflateError\n"; |
473 | |
474 | Returns an C<IO::Uncompress::AnyInflate> object on success and undef on failure. |
475 | The variable C<$AnyInflateError> will contain an error message on failure. |
476 | |
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477 | If you are running Perl 5.005 or better the object, C<$z>, returned from |
478 | IO::Uncompress::AnyInflate can be used exactly like an L<IO::File|IO::File> filehandle. |
479 | This means that all normal input file operations can be carried out with |
480 | C<$z>. For example, to read a line from a compressed file/buffer you can |
481 | use either of these forms |
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482 | |
483 | $line = $z->getline(); |
484 | $line = <$z>; |
485 | |
486 | The mandatory parameter C<$input> is used to determine the source of the |
487 | compressed data. This parameter can take one of three forms. |
488 | |
489 | =over 5 |
490 | |
491 | =item A filename |
492 | |
493 | If the C<$input> parameter is a scalar, it is assumed to be a filename. This |
494 | file will be opened for reading and the compressed data will be read from it. |
495 | |
496 | =item A filehandle |
497 | |
498 | If the C<$input> parameter is a filehandle, the compressed data will be |
499 | read from it. |
500 | The string '-' can be used as an alias for standard input. |
501 | |
502 | |
503 | =item A scalar reference |
504 | |
505 | If C<$input> is a scalar reference, the compressed data will be read from |
506 | C<$$output>. |
507 | |
508 | =back |
509 | |
510 | =head2 Constructor Options |
511 | |
512 | |
513 | The option names defined below are case insensitive and can be optionally |
514 | prefixed by a '-'. So all of the following are valid |
515 | |
516 | -AutoClose |
517 | -autoclose |
518 | AUTOCLOSE |
519 | autoclose |
520 | |
521 | OPTS is a combination of the following options: |
522 | |
523 | =over 5 |
524 | |
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525 | =item C<< AutoClose => 0|1 >> |
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526 | |
527 | This option is only valid when the C<$input> parameter is a filehandle. If |
528 | specified, and the value is true, it will result in the file being closed once |
529 | either the C<close> method is called or the IO::Uncompress::AnyInflate object is |
530 | destroyed. |
531 | |
532 | This parameter defaults to 0. |
533 | |
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534 | =item C<< MultiStream => 0|1 >> |
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535 | |
536 | |
537 | |
538 | Allows multiple concatenated compressed streams to be treated as a single |
539 | compressed stream. Decompression will stop once either the end of the |
540 | file/buffer is reached, an error is encountered (premature eof, corrupt |
541 | compressed data) or the end of a stream is not immediately followed by the |
542 | start of another stream. |
543 | |
544 | This parameter defaults to 0. |
545 | |
546 | |
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547 | =item C<< Prime => $string >> |
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548 | |
549 | This option will uncompress the contents of C<$string> before processing the |
550 | input file/buffer. |
551 | |
552 | This option can be useful when the compressed data is embedded in another |
553 | file/data structure and it is not possible to work out where the compressed |
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554 | data begins without having to read the first few bytes. If this is the |
555 | case, the uncompression can be I<primed> with these bytes using this |
556 | option. |
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557 | |
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558 | =item C<< Transparent => 0|1 >> |
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559 | |
560 | If this option is set and the input file or buffer is not compressed data, |
561 | the module will allow reading of it anyway. |
562 | |
563 | This option defaults to 1. |
564 | |
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565 | =item C<< BlockSize => $num >> |
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566 | |
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567 | When reading the compressed input data, IO::Uncompress::AnyInflate will read it in |
568 | blocks of C<$num> bytes. |
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569 | |
570 | This option defaults to 4096. |
571 | |
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572 | =item C<< InputLength => $size >> |
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573 | |
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574 | When present this option will limit the number of compressed bytes read |
575 | from the input file/buffer to C<$size>. This option can be used in the |
576 | situation where there is useful data directly after the compressed data |
577 | stream and you know beforehand the exact length of the compressed data |
578 | stream. |
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579 | |
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580 | This option is mostly used when reading from a filehandle, in which case |
581 | the file pointer will be left pointing to the first byte directly after the |
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582 | compressed data stream. |
583 | |
584 | |
585 | |
586 | This option defaults to off. |
587 | |
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588 | =item C<< Append => 0|1 >> |
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589 | |
590 | This option controls what the C<read> method does with uncompressed data. |
591 | |
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592 | If set to 1, all uncompressed data will be appended to the output parameter |
593 | of the C<read> method. |
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594 | |
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595 | If set to 0, the contents of the output parameter of the C<read> method |
596 | will be overwritten by the uncompressed data. |
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597 | |
598 | Defaults to 0. |
599 | |
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600 | =item C<< Strict => 0|1 >> |
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601 | |
602 | |
603 | |
604 | This option controls whether the extra checks defined below are used when |
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605 | carrying out the decompression. When Strict is on, the extra tests are |
606 | carried out, when Strict is off they are not. |
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607 | |
608 | The default for this option is off. |
609 | |
610 | |
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611 | If the input is an RFC 1950 data stream, the following will be checked: |
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612 | |
613 | |
614 | |
615 | |
616 | =over 5 |
617 | |
618 | =item 1 |
619 | |
620 | The ADLER32 checksum field must be present. |
621 | |
622 | =item 2 |
623 | |
624 | The value of the ADLER32 field read must match the adler32 value of the |
625 | uncompressed data actually contained in the file. |
626 | |
627 | =back |
628 | |
629 | |
630 | |
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631 | If the input is a gzip (RFC 1952) data stream, the following will be checked: |
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632 | |
633 | |
634 | |
635 | |
636 | =over 5 |
637 | |
638 | =item 1 |
639 | |
640 | If the FHCRC bit is set in the gzip FLG header byte, the CRC16 bytes in the |
641 | header must match the crc16 value of the gzip header actually read. |
642 | |
643 | =item 2 |
644 | |
645 | If the gzip header contains a name field (FNAME) it consists solely of ISO |
646 | 8859-1 characters. |
647 | |
648 | =item 3 |
649 | |
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650 | If the gzip header contains a comment field (FCOMMENT) it consists solely |
651 | of ISO 8859-1 characters plus line-feed. |
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652 | |
653 | =item 4 |
654 | |
655 | If the gzip FEXTRA header field is present it must conform to the sub-field |
a02d0f6f |
656 | structure as defined in RFC 1952. |
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657 | |
658 | =item 5 |
659 | |
660 | The CRC32 and ISIZE trailer fields must be present. |
661 | |
662 | =item 6 |
663 | |
664 | The value of the CRC32 field read must match the crc32 value of the |
665 | uncompressed data actually contained in the gzip file. |
666 | |
667 | =item 7 |
668 | |
1a6a8453 |
669 | The value of the ISIZE fields read must match the length of the |
670 | uncompressed data actually read from the file. |
642e522c |
671 | |
672 | =back |
673 | |
674 | |
675 | |
676 | |
677 | |
678 | |
e7d45986 |
679 | =item C<< ParseExtra => 0|1 >> |
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680 | |
681 | If the gzip FEXTRA header field is present and this option is set, it will |
682 | force the module to check that it conforms to the sub-field structure as |
a02d0f6f |
683 | defined in RFC 1952. |
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684 | |
685 | If the C<Strict> is on it will automatically enable this option. |
686 | |
687 | Defaults to 0. |
688 | |
689 | |
690 | |
a02d0f6f |
691 | |
692 | |
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693 | =back |
694 | |
695 | =head2 Examples |
696 | |
697 | TODO |
698 | |
699 | =head1 Methods |
700 | |
701 | =head2 read |
702 | |
703 | Usage is |
704 | |
705 | $status = $z->read($buffer) |
706 | |
707 | Reads a block of compressed data (the size the the compressed block is |
708 | determined by the C<Buffer> option in the constructor), uncompresses it and |
1a6a8453 |
709 | writes any uncompressed data into C<$buffer>. If the C<Append> parameter is |
710 | set in the constructor, the uncompressed data will be appended to the |
711 | C<$buffer> parameter. Otherwise C<$buffer> will be overwritten. |
642e522c |
712 | |
1a6a8453 |
713 | Returns the number of uncompressed bytes written to C<$buffer>, zero if eof |
714 | or a negative number on error. |
642e522c |
715 | |
716 | =head2 read |
717 | |
718 | Usage is |
719 | |
720 | $status = $z->read($buffer, $length) |
721 | $status = $z->read($buffer, $length, $offset) |
722 | |
723 | $status = read($z, $buffer, $length) |
724 | $status = read($z, $buffer, $length, $offset) |
725 | |
726 | Attempt to read C<$length> bytes of uncompressed data into C<$buffer>. |
727 | |
1a6a8453 |
728 | The main difference between this form of the C<read> method and the |
729 | previous one, is that this one will attempt to return I<exactly> C<$length> |
730 | bytes. The only circumstances that this function will not is if end-of-file |
731 | or an IO error is encountered. |
642e522c |
732 | |
1a6a8453 |
733 | Returns the number of uncompressed bytes written to C<$buffer>, zero if eof |
734 | or a negative number on error. |
642e522c |
735 | |
736 | |
737 | =head2 getline |
738 | |
739 | Usage is |
740 | |
741 | $line = $z->getline() |
742 | $line = <$z> |
743 | |
744 | Reads a single line. |
745 | |
746 | This method fully supports the use of of the variable C<$/> |
747 | (or C<$INPUT_RECORD_SEPARATOR> or C<$RS> when C<English> is in use) to |
748 | determine what constitutes an end of line. Both paragraph mode and file |
749 | slurp mode are supported. |
750 | |
751 | |
752 | =head2 getc |
753 | |
754 | Usage is |
755 | |
756 | $char = $z->getc() |
757 | |
758 | Read a single character. |
759 | |
760 | =head2 ungetc |
761 | |
762 | Usage is |
763 | |
764 | $char = $z->ungetc($string) |
765 | |
766 | |
a02d0f6f |
767 | |
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768 | =head2 inflateSync |
769 | |
770 | Usage is |
771 | |
772 | $status = $z->inflateSync() |
773 | |
774 | TODO |
775 | |
a02d0f6f |
776 | |
642e522c |
777 | =head2 getHeaderInfo |
778 | |
779 | Usage is |
780 | |
1a6a8453 |
781 | $hdr = $z->getHeaderInfo(); |
782 | @hdrs = $z->getHeaderInfo(); |
642e522c |
783 | |
1a6a8453 |
784 | This method returns either a hash reference (in scalar context) or a list |
785 | or hash references (in array context) that contains information about each |
786 | of the header fields in the compressed data stream(s). |
642e522c |
787 | |
788 | |
789 | |
790 | |
791 | =head2 tell |
792 | |
793 | Usage is |
794 | |
795 | $z->tell() |
796 | tell $z |
797 | |
798 | Returns the uncompressed file offset. |
799 | |
800 | =head2 eof |
801 | |
802 | Usage is |
803 | |
804 | $z->eof(); |
805 | eof($z); |
806 | |
807 | |
808 | |
809 | Returns true if the end of the compressed input stream has been reached. |
810 | |
811 | |
812 | |
813 | =head2 seek |
814 | |
815 | $z->seek($position, $whence); |
816 | seek($z, $position, $whence); |
817 | |
818 | |
819 | |
820 | |
821 | Provides a sub-set of the C<seek> functionality, with the restriction |
822 | that it is only legal to seek forward in the input file/buffer. |
823 | It is a fatal error to attempt to seek backward. |
824 | |
825 | |
826 | |
827 | The C<$whence> parameter takes one the usual values, namely SEEK_SET, |
828 | SEEK_CUR or SEEK_END. |
829 | |
830 | Returns 1 on success, 0 on failure. |
831 | |
832 | =head2 binmode |
833 | |
834 | Usage is |
835 | |
836 | $z->binmode |
837 | binmode $z ; |
838 | |
839 | This is a noop provided for completeness. |
840 | |
a02d0f6f |
841 | =head2 opened |
842 | |
843 | $z->opened() |
844 | |
845 | Returns true if the object currently refers to a opened file/buffer. |
846 | |
847 | =head2 autoflush |
848 | |
849 | my $prev = $z->autoflush() |
850 | my $prev = $z->autoflush(EXPR) |
851 | |
852 | If the C<$z> object is associated with a file or a filehandle, this method |
853 | returns the current autoflush setting for the underlying filehandle. If |
854 | C<EXPR> is present, and is non-zero, it will enable flushing after every |
855 | write/print operation. |
856 | |
857 | If C<$z> is associated with a buffer, this method has no effect and always |
858 | returns C<undef>. |
859 | |
860 | B<Note> that the special variable C<$|> B<cannot> be used to set or |
861 | retrieve the autoflush setting. |
862 | |
863 | =head2 input_line_number |
864 | |
865 | $z->input_line_number() |
866 | $z->input_line_number(EXPR) |
867 | |
868 | |
869 | |
870 | Returns the current uncompressed line number. If C<EXPR> is present it has |
871 | the effect of setting the line number. Note that setting the line number |
872 | does not change the current position within the file/buffer being read. |
873 | |
874 | The contents of C<$/> are used to to determine what constitutes a line |
875 | terminator. |
876 | |
877 | |
878 | |
642e522c |
879 | =head2 fileno |
880 | |
881 | $z->fileno() |
882 | fileno($z) |
883 | |
a02d0f6f |
884 | If the C<$z> object is associated with a file or a filehandle, this method |
885 | will return the underlying file descriptor. |
642e522c |
886 | |
887 | If the C<$z> object is is associated with a buffer, this method will |
888 | return undef. |
889 | |
890 | =head2 close |
891 | |
892 | $z->close() ; |
893 | close $z ; |
894 | |
895 | |
896 | |
897 | Closes the output file/buffer. |
898 | |
899 | |
900 | |
901 | For most versions of Perl this method will be automatically invoked if |
902 | the IO::Uncompress::AnyInflate object is destroyed (either explicitly or by the |
903 | variable with the reference to the object going out of scope). The |
904 | exceptions are Perl versions 5.005 through 5.00504 and 5.8.0. In |
905 | these cases, the C<close> method will be called automatically, but |
906 | not until global destruction of all live objects when the program is |
907 | terminating. |
908 | |
909 | Therefore, if you want your scripts to be able to run on all versions |
910 | of Perl, you should call C<close> explicitly and not rely on automatic |
911 | closing. |
912 | |
913 | Returns true on success, otherwise 0. |
914 | |
915 | If the C<AutoClose> option has been enabled when the IO::Uncompress::AnyInflate |
916 | object was created, and the object is associated with a file, the |
917 | underlying file will also be closed. |
918 | |
919 | |
920 | |
921 | |
e7d45986 |
922 | =head2 nextStream |
923 | |
924 | Usage is |
925 | |
926 | my $status = $z->nextStream(); |
927 | |
928 | Skips to the next compressed data stream in the input file/buffer. If a new |
929 | compressed data stream is found, the eof marker will be cleared, C<$.> will |
930 | be reset to 0. |
931 | |
932 | Returns 1 if a new stream was found, 0 if none was found, and -1 if an |
933 | error was encountered. |
934 | |
935 | =head2 trailingData |
936 | |
937 | Usage is |
938 | |
939 | my $data = $z->trailingData(); |
940 | |
941 | Returns any data that |
942 | |
642e522c |
943 | =head1 Importing |
944 | |
945 | No symbolic constants are required by this IO::Uncompress::AnyInflate at present. |
946 | |
947 | =over 5 |
948 | |
949 | =item :all |
950 | |
951 | Imports C<anyinflate> and C<$AnyInflateError>. |
952 | Same as doing this |
953 | |
954 | use IO::Uncompress::AnyInflate qw(anyinflate $AnyInflateError) ; |
955 | |
956 | =back |
957 | |
958 | =head1 EXAMPLES |
959 | |
960 | |
961 | |
962 | |
963 | =head1 SEE ALSO |
964 | |
a02d0f6f |
965 | 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::Uncompress::RawInflate>, L<IO::Compress::Bzip2>, L<IO::Uncompress::Bunzip2>, L<IO::Compress::Lzop>, L<IO::Uncompress::UnLzop>, L<IO::Uncompress::AnyUncompress> |
642e522c |
966 | |
967 | L<Compress::Zlib::FAQ|Compress::Zlib::FAQ> |
968 | |
a02d0f6f |
969 | L<File::GlobMapper|File::GlobMapper>, L<Archive::Zip|Archive::Zip>, |
970 | L<Archive::Tar|Archive::Tar>, |
642e522c |
971 | L<IO::Zlib|IO::Zlib> |
972 | |
a02d0f6f |
973 | |
642e522c |
974 | For RFC 1950, 1951 and 1952 see |
975 | F<http://www.faqs.org/rfcs/rfc1950.html>, |
976 | F<http://www.faqs.org/rfcs/rfc1951.html> and |
977 | F<http://www.faqs.org/rfcs/rfc1952.html> |
978 | |
a02d0f6f |
979 | The I<zlib> compression library was written by Jean-loup Gailly |
980 | F<gzip@prep.ai.mit.edu> and Mark Adler F<madler@alumni.caltech.edu>. |
981 | |
982 | The primary site for the I<zlib> compression library is |
983 | F<http://www.zlib.org>. |
984 | |
985 | The primary site for gzip is F<http://www.gzip.org>. |
986 | |
987 | |
988 | |
989 | |
642e522c |
990 | =head1 AUTHOR |
991 | |
cb7abd7f |
992 | This module was written by Paul Marquess, F<pmqs@cpan.org>. |
642e522c |
993 | |
642e522c |
994 | |
642e522c |
995 | |
996 | =head1 MODIFICATION HISTORY |
997 | |
998 | See the Changes file. |
999 | |
1000 | =head1 COPYRIGHT AND LICENSE |
642e522c |
1001 | |
1a6a8453 |
1002 | Copyright (c) 2005-2006 Paul Marquess. All rights reserved. |
a02d0f6f |
1003 | |
642e522c |
1004 | This program is free software; you can redistribute it and/or |
1005 | modify it under the same terms as Perl itself. |
1006 | |