ILIAS  release_5-2 Revision v5.2.25-18-g3f80b828510
Gzip.php
Go to the documentation of this file.
1<?php
2
3namespace GetId3\Module\Archive;
4
5use GetId3\Lib\Helper;
6use GetId3\GetId3Core;
7
10// available at http://getid3.sourceforge.net //
11// or http://www.getid3.org //
13// See readme.txt for more details //
15// //
16// module.archive.gzip.php //
17// module for analyzing GZIP files //
18// dependencies: NONE //
19// ///
21// //
22// Module originally written by //
23// Mike Mozolin <teddybearØmail*ru> //
24// //
26
35class Gzip
36{
43 public $option_gzip_parse_contents = false;
44
49 public function analyze()
50 {
51 $info = &$this->getid3->info;
52
53 $info['fileformat'] = 'gzip';
54
55 $start_length = 10;
56 $unpack_header = 'a1id1/a1id2/a1cmethod/a1flags/a4mtime/a1xflags/a1os';
57 //+---+---+---+---+---+---+---+---+---+---+
58 //|ID1|ID2|CM |FLG| MTIME |XFL|OS |
59 //+---+---+---+---+---+---+---+---+---+---+
60
61 if ($info['filesize'] > $info['php_memory_limit']) {
62 $info['error'][] = 'File is too large (' . number_format($info['filesize']) . ' bytes) to read into memory (limit: ' . number_format($info['php_memory_limit'] / 1048576) . 'MB)';
63
64 return false;
65 }
66 fseek($this->getid3->fp, 0);
67 $buffer = fread($this->getid3->fp, $info['filesize']);
68
69 $arr_members = explode("\x1F\x8B\x08", $buffer);
70 while (true) {
71 $is_wrong_members = false;
72 $num_members = intval(count($arr_members));
73 for ($i = 0; $i < $num_members; $i++) {
74 if (strlen($arr_members[$i]) == 0) {
75 continue;
76 }
77 $buf = "\x1F\x8B\x08" . $arr_members[$i];
78
79 $attr = unpack($unpack_header, substr($buf, 0, $start_length));
80 if (!$this->get_os_type(ord($attr['os']))) {
81 // Merge member with previous if wrong OS type
82 $arr_members[$i - 1] .= $buf;
83 $arr_members[$i] = '';
84 $is_wrong_members = true;
85 continue;
86 }
87 }
88 if (!$is_wrong_members) {
89 break;
90 }
91 }
92
93 $info['gzip']['files'] = array();
94
95 $fpointer = 0;
96 $idx = 0;
97 for ($i = 0; $i < $num_members; $i++) {
98 if (strlen($arr_members[$i]) == 0) {
99 continue;
100 }
101 $thisInfo = &$info['gzip']['member_header'][++$idx];
102
103 $buff = "\x1F\x8B\x08" . $arr_members[$i];
104
105 $attr = unpack($unpack_header, substr($buff, 0, $start_length));
106 $thisInfo['filemtime'] = Helper::LittleEndian2Int($attr['mtime']);
107 $thisInfo['raw']['id1'] = ord($attr['cmethod']);
108 $thisInfo['raw']['id2'] = ord($attr['cmethod']);
109 $thisInfo['raw']['cmethod'] = ord($attr['cmethod']);
110 $thisInfo['raw']['os'] = ord($attr['os']);
111 $thisInfo['raw']['xflags'] = ord($attr['xflags']);
112 $thisInfo['raw']['flags'] = ord($attr['flags']);
113
114 $thisInfo['flags']['crc16'] = (bool) ($thisInfo['raw']['flags'] & 0x02);
115 $thisInfo['flags']['extra'] = (bool) ($thisInfo['raw']['flags'] & 0x04);
116 $thisInfo['flags']['filename'] = (bool) ($thisInfo['raw']['flags'] & 0x08);
117 $thisInfo['flags']['comment'] = (bool) ($thisInfo['raw']['flags'] & 0x10);
118
119 $thisInfo['compression'] = $this->get_xflag_type($thisInfo['raw']['xflags']);
120
121 $thisInfo['os'] = $this->get_os_type($thisInfo['raw']['os']);
122 if (!$thisInfo['os']) {
123 $info['error'][] = 'Read error on gzip file';
124
125 return false;
126 }
127
128 $fpointer = 10;
129 $arr_xsubfield = array();
130 // bit 2 - FLG.FEXTRA
131 //+---+---+=================================+
132 //| XLEN |...XLEN bytes of "extra field"...|
133 //+---+---+=================================+
134 if ($thisInfo['flags']['extra']) {
135 $w_xlen = substr($buff, $fpointer, 2);
136 $xlen = Helper::LittleEndian2Int($w_xlen);
137 $fpointer += 2;
138
139 $thisInfo['raw']['xfield'] = substr($buff, $fpointer, $xlen);
140 // Extra SubFields
141 //+---+---+---+---+==================================+
142 //|SI1|SI2| LEN |... LEN bytes of subfield data ...|
143 //+---+---+---+---+==================================+
144 $idx = 0;
145 while (true) {
146 if ($idx >= $xlen) {
147 break;
148 }
149 $si1 = ord(substr($buff, $fpointer + $idx++, 1));
150 $si2 = ord(substr($buff, $fpointer + $idx++, 1));
151 if (($si1 == 0x41) && ($si2 == 0x70)) {
152 $w_xsublen = substr($buff, $fpointer + $idx, 2);
153 $xsublen = Helper::LittleEndian2Int($w_xsublen);
154 $idx += 2;
155 $arr_xsubfield[] = substr($buff, $fpointer + $idx,
156 $xsublen);
157 $idx += $xsublen;
158 } else {
159 break;
160 }
161 }
162 $fpointer += $xlen;
163 }
164 // bit 3 - FLG.FNAME
165 //+=========================================+
166 //|...original file name, zero-terminated...|
167 //+=========================================+
168 // GZIP files may have only one file, with no filename, so assume original filename is current filename without .gz
169 $thisInfo['filename'] = preg_replace('#\.gz$#i', '',
170 $info['filename']);
171 if ($thisInfo['flags']['filename']) {
172 while (true) {
173 if (ord($buff[$fpointer]) == 0) {
174 $fpointer++;
175 break;
176 }
177 $thisInfo['filename'] .= $buff[$fpointer];
178 $fpointer++;
179 }
180 }
181 // bit 4 - FLG.FCOMMENT
182 //+===================================+
183 //|...file comment, zero-terminated...|
184 //+===================================+
185 if ($thisInfo['flags']['comment']) {
186 while (true) {
187 if (ord($buff[$fpointer]) == 0) {
188 $fpointer++;
189 break;
190 }
191 $thisInfo['comment'] .= $buff[$fpointer];
192 $fpointer++;
193 }
194 }
195 // bit 1 - FLG.FHCRC
196 //+---+---+
197 //| CRC16 |
198 //+---+---+
199 if ($thisInfo['flags']['crc16']) {
200 $w_crc = substr($buff, $fpointer, 2);
201 $thisInfo['crc16'] = Helper::LittleEndian2Int($w_crc);
202 $fpointer += 2;
203 }
204 // bit 0 - FLG.FTEXT
205 //if ($thisInfo['raw']['flags'] & 0x01) {
206 // Ignored...
207 //}
208 // bits 5, 6, 7 - reserved
209
210 $thisInfo['crc32'] = Helper::LittleEndian2Int(substr($buff,
211 strlen($buff) - 8,
212 4));
213 $thisInfo['filesize'] = Helper::LittleEndian2Int(substr($buff,
214 strlen($buff) - 4));
215
216 $info['gzip']['files'] = Helper::array_merge_clobber($info['gzip']['files'],
217 Helper::CreateDeepArray($thisInfo['filename'],
218 '/',
219 $thisInfo['filesize']));
220
221 if ($this->option_gzip_parse_contents) {
222 // Try to inflate GZip
223 $csize = 0;
224 $inflated = '';
225 $chkcrc32 = '';
226 if (function_exists('gzinflate')) {
227 $cdata = substr($buff, $fpointer);
228 $cdata = substr($cdata, 0, strlen($cdata) - 8);
229 $csize = strlen($cdata);
230 $inflated = gzinflate($cdata);
231
232 // Calculate CRC32 for inflated content
233 $thisInfo['crc32_valid'] = (bool) (sprintf('%u',
234 crc32($inflated)) == $thisInfo['crc32']);
235
236 // determine format
237 $formattest = substr($inflated, 0, 32774);
238 $getid3_temp = new GetId3Core();
239 $determined_format = $getid3_temp->GetFileFormat($formattest);
240 unset($getid3_temp);
241
242 // file format is determined
243 $determined_format['module'] = (isset($determined_format['module']) ? $determined_format['module'] : '');
244 switch ($determined_format['module']) {
245 case 'tar':
246 // view TAR-file info
247 if (class_exists($determined_format['class'])) {
248 if (($temp_tar_filename = tempnam(GetId3Core::getTempDir(),
249 'getID3')) === false) {
250 // can't find anywhere to create a temp file, abort
251 $info['error'][] = 'Unable to create temp file to parse TAR inside GZIP file';
252 break;
253 }
254 if ($fp_temp_tar = fopen($temp_tar_filename,
255 'w+b')) {
256 fwrite($fp_temp_tar, $inflated);
257 fclose($fp_temp_tar);
258 $getid3_temp = new GetId3Core();
259 $getid3_temp->openfile($temp_tar_filename);
260 $getid3_tar = new Tar($getid3_temp);
261 $getid3_tar->analyze();
262 $info['gzip']['member_header'][$idx]['tar'] = $getid3_temp->info['tar'];
263 unset($getid3_temp, $getid3_tar);
264 unlink($temp_tar_filename);
265 } else {
266 $info['error'][] = 'Unable to fopen() temp file to parse TAR inside GZIP file';
267 break;
268 }
269 }
270 break;
271
272 case '':
273 default:
274 // unknown or unhandled format
275 break;
276 }
277 }
278 }
279 }
280
281 return true;
282 }
283
291 public function get_os_type($key)
292 {
293 static $os_type = array(
294 '0' => 'FAT filesystem (MS-DOS, OS/2, NT/Win32)',
295 '1' => 'Amiga',
296 '2' => 'VMS (or OpenVMS)',
297 '3' => 'Unix',
298 '4' => 'VM/CMS',
299 '5' => 'Atari TOS',
300 '6' => 'HPFS filesystem (OS/2, NT)',
301 '7' => 'Macintosh',
302 '8' => 'Z-System',
303 '9' => 'CP/M',
304 '10' => 'TOPS-20',
305 '11' => 'NTFS filesystem (NT)',
306 '12' => 'QDOS',
307 '13' => 'Acorn RISCOS',
308 '255' => 'unknown'
309 );
310
311 return (isset($os_type[$key]) ? $os_type[$key] : '');
312 }
313
321 public function get_xflag_type($key)
322 {
323 static $xflag_type = array(
324 '0' => 'unknown',
325 '2' => 'maximum compression',
326 '4' => 'fastest algorithm'
327 );
328
329 return (isset($xflag_type[$key]) ? $xflag_type[$key] : '');
330 }
331}
sprintf
sprintf('%.4f', $callTime)
Definition: 01pharSimple.php:87
php
An exception for terminatinating execution or to throw for unit testing.
GetId3\GetId3Core
GetId3() by James Heinrich info@getid3.org //.
Definition: GetId3Core.php:26
GetId3\Lib\Helper
GetId3() by James Heinrich info@getid3.org //.
Definition: Helper.php:27
GetId3\Lib\Helper\array_merge_clobber
static array_merge_clobber($array1, $array2)
Definition: Helper.php:561
GetId3\Lib\Helper\LittleEndian2Int
static LittleEndian2Int($byteword, $signed=false)
Definition: Helper.php:413
GetId3\Lib\Helper\CreateDeepArray
static CreateDeepArray($ArrayPath, $Separator, $Value)
Definition: Helper.php:726
GetId3\Module\Archive\Gzip
GetId3() by James Heinrich info@getid3.org //.
Definition: Gzip.php:36
GetId3\Module\Archive\Gzip\get_xflag_type
get_xflag_type($key)
Converts the eXtra FLags.
Definition: Gzip.php:321
GetId3\Module\Archive\Gzip\get_os_type
get_os_type($key)
Converts the OS type.
Definition: Gzip.php:291
GetId3\Module\Archive\Tar
GetId3() by James Heinrich info@getid3.org //.
Definition: Tar.php:36
$info
$info
Definition: example_052.php:80