data = file_get_contents($pFilename, false, null, 0, 8); // Check OLE identifier $identifierOle = pack('CCCCCCCC', 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1); if ($this->data != $identifierOle) { throw new ReaderException('The filename ' . $pFilename . ' is not recognised as an OLE file'); } // Get the file data $this->data = file_get_contents($pFilename); // 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 = []; $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. * * @param int $stream * * @return string */ public function getStream($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; } $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(): void { $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[] = [ '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; } elseif ($upName === 'ROOT ENTRY' || $upName === 'R') { // Root entry $this->rootentry = count($this->props) - 1; } // Summary information if ($name == chr(5) . 'SummaryInformation') { $this->summaryInformation = count($this->props) - 1; } // Additional Document Summary information if ($name == chr(5) . 'DocumentSummaryInformation') { $this->documentSummaryInformation = count($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, $pos) { if ($pos < 0) { // Invalid position throw new ReaderException('Parameter pos=' . $pos . ' is invalid.'); } $len = strlen($data); if ($len < $pos + 4) { $data .= str_repeat("\0", $pos + 4 - $len); } // FIX: represent numbers correctly on 64-bit system // http://sourceforge.net/tracker/index.php?func=detail&aid=1487372&group_id=99160&atid=623334 // Changed 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; } }