1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
|
<?php /** * PHPExcel * * Copyright (c) 2006 - 2014 PHPExcel * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * @category PHPExcel * @package PHPExcel_Shared * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version ##VERSION##, ##DATE## */
defined('IDENTIFIER_OLE') || define('IDENTIFIER_OLE', pack('CCCCCCCC', 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1));
class PHPExcel_Shared_OLERead { private $data = '';
// OLE identifier const IDENTIFIER_OLE = IDENTIFIER_OLE;
// Size of a sector = 512 bytes const BIG_BLOCK_SIZE = 0x200;
// Size of a short sector = 64 bytes const SMALL_BLOCK_SIZE = 0x40;
// Size of a directory entry always = 128 bytes const PROPERTY_STORAGE_BLOCK_SIZE = 0x80;
// Minimum size of a standard stream = 4096 bytes, streams smaller than this are stored as short streams const SMALL_BLOCK_THRESHOLD = 0x1000;
// header offsets const NUM_BIG_BLOCK_DEPOT_BLOCKS_POS = 0x2c; const ROOT_START_BLOCK_POS = 0x30; const SMALL_BLOCK_DEPOT_BLOCK_POS = 0x3c; const EXTENSION_BLOCK_POS = 0x44; const NUM_EXTENSION_BLOCK_POS = 0x48; const BIG_BLOCK_DEPOT_BLOCKS_POS = 0x4c;
// property storage offsets (directory offsets) const SIZE_OF_NAME_POS = 0x40; const TYPE_POS = 0x42; const START_BLOCK_POS = 0x74; const SIZE_POS = 0x78;
public $wrkbook = null; public $summaryInformation = null; public $documentSummaryInformation = null;
/** * Read the file * * @param $sFileName string Filename * @throws PHPExcel_Reader_Exception */ public function read($sFileName) { // Check if file exists and is readable if(!is_readable($sFileName)) { throw new PHPExcel_Reader_Exception("Could not open " . $sFileName . " for reading! File does not exist, or it is not readable."); }
// Get the file identifier // Don't bother reading the whole file until we know it's a valid OLE file $this->data = file_get_contents($sFileName, FALSE, NULL, 0, 8);
// Check OLE identifier if ($this->data != self::IDENTIFIER_OLE) { throw new PHPExcel_Reader_Exception('The filename ' . $sFileName . ' is not recognised as an OLE file'); }
// Get the file data $this->data = file_get_contents($sFileName);
// Total number of sectors used for the SAT $this->numBigBlockDepotBlocks = self::_GetInt4d($this->data, self::NUM_BIG_BLOCK_DEPOT_BLOCKS_POS);
// SecID of the first sector of the directory stream $this->rootStartBlock = self::_GetInt4d($this->data, self::ROOT_START_BLOCK_POS);
// SecID of the first sector of the SSAT (or -2 if not extant) $this->sbdStartBlock = self::_GetInt4d($this->data, self::SMALL_BLOCK_DEPOT_BLOCK_POS);
// SecID of the first sector of the MSAT (or -2 if no additional sectors are used) $this->extensionBlock = self::_GetInt4d($this->data, self::EXTENSION_BLOCK_POS);
// Total number of sectors used by MSAT $this->numExtensionBlocks = self::_GetInt4d($this->data, self::NUM_EXTENSION_BLOCK_POS);
$bigBlockDepotBlocks = array(); $pos = self::BIG_BLOCK_DEPOT_BLOCKS_POS;
$bbdBlocks = $this->numBigBlockDepotBlocks;
if ($this->numExtensionBlocks != 0) { $bbdBlocks = (self::BIG_BLOCK_SIZE - self::BIG_BLOCK_DEPOT_BLOCKS_POS)/4; }
for ($i = 0; $i < $bbdBlocks; ++$i) { $bigBlockDepotBlocks[$i] = self::_GetInt4d($this->data, $pos); $pos += 4; }
for ($j = 0; $j < $this->numExtensionBlocks; ++$j) { $pos = ($this->extensionBlock + 1) * self::BIG_BLOCK_SIZE; $blocksToRead = min($this->numBigBlockDepotBlocks - $bbdBlocks, self::BIG_BLOCK_SIZE / 4 - 1);
for ($i = $bbdBlocks; $i < $bbdBlocks + $blocksToRead; ++$i) { $bigBlockDepotBlocks[$i] = self::_GetInt4d($this->data, $pos); $pos += 4; }
$bbdBlocks += $blocksToRead; if ($bbdBlocks < $this->numBigBlockDepotBlocks) { $this->extensionBlock = self::_GetInt4d($this->data, $pos); } }
$pos = 0; $this->bigBlockChain = ''; $bbs = self::BIG_BLOCK_SIZE / 4; for ($i = 0; $i < $this->numBigBlockDepotBlocks; ++$i) { $pos = ($bigBlockDepotBlocks[$i] + 1) * self::BIG_BLOCK_SIZE;
$this->bigBlockChain .= substr($this->data, $pos, 4*$bbs); $pos += 4*$bbs; }
$pos = 0; $sbdBlock = $this->sbdStartBlock; $this->smallBlockChain = ''; while ($sbdBlock != -2) { $pos = ($sbdBlock + 1) * self::BIG_BLOCK_SIZE;
$this->smallBlockChain .= substr($this->data, $pos, 4*$bbs); $pos += 4*$bbs;
$sbdBlock = self::_GetInt4d($this->bigBlockChain, $sbdBlock*4); }
// read the directory stream $block = $this->rootStartBlock; $this->entry = $this->_readData($block);
$this->_readPropertySets(); }
/** * Extract binary stream data * * @return string */ public function getStream($stream) { if ($stream === NULL) { return null; }
$streamData = '';
if ($this->props[$stream]['size'] < self::SMALL_BLOCK_THRESHOLD) { $rootdata = $this->_readData($this->props[$this->rootentry]['startBlock']);
$block = $this->props[$stream]['startBlock'];
while ($block != -2) { $pos = $block * self::SMALL_BLOCK_SIZE; $streamData .= substr($rootdata, $pos, self::SMALL_BLOCK_SIZE);
$block = self::_GetInt4d($this->smallBlockChain, $block*4); }
return $streamData; } else { $numBlocks = $this->props[$stream]['size'] / self::BIG_BLOCK_SIZE; if ($this->props[$stream]['size'] % self::BIG_BLOCK_SIZE != 0) { ++$numBlocks; }
if ($numBlocks == 0) return '';
$block = $this->props[$stream]['startBlock'];
while ($block != -2) { $pos = ($block + 1) * self::BIG_BLOCK_SIZE; $streamData .= substr($this->data, $pos, self::BIG_BLOCK_SIZE); $block = self::_GetInt4d($this->bigBlockChain, $block*4); }
return $streamData; } }
/** * Read a standard stream (by joining sectors using information from SAT) * * @param int $bl Sector ID where the stream starts * @return string Data for standard stream */ private function _readData($bl) { $block = $bl; $data = '';
while ($block != -2) { $pos = ($block + 1) * self::BIG_BLOCK_SIZE; $data .= substr($this->data, $pos, self::BIG_BLOCK_SIZE); $block = self::_GetInt4d($this->bigBlockChain, $block*4); } return $data; }
/** * Read entries in the directory stream. */ private function _readPropertySets() { $offset = 0;
// loop through entires, each entry is 128 bytes $entryLen = strlen($this->entry); while ($offset < $entryLen) { // entry data (128 bytes) $d = substr($this->entry, $offset, self::PROPERTY_STORAGE_BLOCK_SIZE);
// size in bytes of name $nameSize = ord($d[self::SIZE_OF_NAME_POS]) | (ord($d[self::SIZE_OF_NAME_POS+1]) << 8);
// type of entry $type = ord($d[self::TYPE_POS]);
// sectorID of first sector or short sector, if this entry refers to a stream (the case with workbook) // sectorID of first sector of the short-stream container stream, if this entry is root entry $startBlock = self::_GetInt4d($d, self::START_BLOCK_POS);
$size = self::_GetInt4d($d, self::SIZE_POS);
$name = str_replace("\x00", "", substr($d,0,$nameSize));
$this->props[] = array ( 'name' => $name, 'type' => $type, 'startBlock' => $startBlock, 'size' => $size);
// tmp helper to simplify checks $upName = strtoupper($name);
// Workbook directory entry (BIFF5 uses Book, BIFF8 uses Workbook) if (($upName === 'WORKBOOK') || ($upName === 'BOOK')) { $this->wrkbook = count($this->props) - 1; } else if ( $upName === 'ROOT ENTRY' || $upName === 'R') { // Root entry $this->rootentry = count($this->props) - 1; }
// Summary information if ($name == chr(5) . 'SummaryInformation') { // echo 'Summary Information<br />'; $this->summaryInformation = count($this->props) - 1; }
// Additional Document Summary information if ($name == chr(5) . 'DocumentSummaryInformation') { // echo 'Document Summary Information<br />'; $this->documentSummaryInformation = count($this->props) - 1; }
$offset += self::PROPERTY_STORAGE_BLOCK_SIZE; }
}
/** * Read 4 bytes of data at specified position * * @param string $data * @param int $pos * @return int */ private static function _GetInt4d($data, $pos) { // FIX: represent numbers correctly on 64-bit system // http://sourceforge.net/tracker/index.php?func=detail&aid=1487372&group_id=99160&atid=623334 // Hacked by Andreas Rehm 2006 to ensure correct result of the <<24 block on 32 and 64bit systems $_or_24 = ord($data[$pos + 3]); if ($_or_24 >= 128) { // negative number $_ord_24 = -abs((256 - $_or_24) << 24); } else { $_ord_24 = ($_or_24 & 127) << 24; } return ord($data[$pos]) | (ord($data[$pos + 1]) << 8) | (ord($data[$pos + 2]) << 16) | $_ord_24; }
}
|