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<?php |
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|
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namespace PhpOffice\PhpSpreadsheet\Shared; |
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|
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// vim: set expandtab tabstop=4 shiftwidth=4: |
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// +----------------------------------------------------------------------+ |
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// | PHP Version 4 | |
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// +----------------------------------------------------------------------+ |
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// | Copyright (c) 1997-2002 The PHP Group | |
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// +----------------------------------------------------------------------+ |
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// | This source file is subject to version 2.02 of the PHP license, | |
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// | that is bundled with this package in the file LICENSE, and is | |
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// | available at through the world-wide-web at | |
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// | http://www.php.net/license/2_02.txt. | |
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// | If you did not receive a copy of the PHP license and are unable to | |
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// | obtain it through the world-wide-web, please send a note to | |
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// | license@php.net so we can mail you a copy immediately. | |
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// +----------------------------------------------------------------------+ |
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// | Author: Xavier Noguer <xnoguer@php.net> | |
| 20 |
// | Based on OLE::Storage_Lite by Kawai, Takanori | |
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// +----------------------------------------------------------------------+ |
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// |
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|
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use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException; |
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use PhpOffice\PhpSpreadsheet\Shared\OLE\ChainedBlockStream; |
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use PhpOffice\PhpSpreadsheet\Shared\OLE\PPS\Root; |
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|
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/* |
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* Array for storing OLE instances that are accessed from |
| 30 |
* OLE_ChainedBlockStream::stream_open(). |
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* |
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* @var array |
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*/ |
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$GLOBALS['_OLE_INSTANCES'] = []; |
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|
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/** |
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* OLE package base class. |
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* |
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* @author Xavier Noguer <xnoguer@php.net> |
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* @author Christian Schmidt <schmidt@php.net> |
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* |
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* @category PhpSpreadsheet |
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*/ |
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class OLE |
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{ |
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const OLE_PPS_TYPE_ROOT = 5; |
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const OLE_PPS_TYPE_DIR = 1; |
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const OLE_PPS_TYPE_FILE = 2; |
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const OLE_DATA_SIZE_SMALL = 0x1000; |
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const OLE_LONG_INT_SIZE = 4; |
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const OLE_PPS_SIZE = 0x80; |
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|
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/** |
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* The file handle for reading an OLE container. |
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* |
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* @var resource |
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*/ |
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public $_file_handle; |
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|
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/** |
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* Array of PPS's found on the OLE container. |
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* |
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* @var array |
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*/ |
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public $_list = []; |
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|
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/** |
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* Root directory of OLE container. |
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* |
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* @var Root |
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*/ |
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public $root; |
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|
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/** |
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* Big Block Allocation Table. |
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* |
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* @var array (blockId => nextBlockId) |
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*/ |
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public $bbat; |
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|
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/** |
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* Short Block Allocation Table. |
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* |
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* @var array (blockId => nextBlockId) |
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*/ |
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public $sbat; |
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|
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/** |
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* Size of big blocks. This is usually 512. |
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* |
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* @var int number of octets per block |
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*/ |
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public $bigBlockSize; |
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|
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/** |
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* Size of small blocks. This is usually 64. |
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* |
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* @var int number of octets per block |
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*/ |
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public $smallBlockSize; |
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|
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/** |
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* Threshold for big blocks. |
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* |
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* @var int |
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*/ |
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public $bigBlockThreshold; |
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|
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/** |
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* Reads an OLE container from the contents of the file given. |
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* |
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* @acces public |
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* |
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* @param string $file |
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* |
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* @throws ReaderException |
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* |
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* @return bool true on success, PEAR_Error on failure |
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*/ |
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public function read($file) |
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{ |
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$fh = fopen($file, 'r'); |
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if (!$fh) { |
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throw new ReaderException("Can't open file $file"); |
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} |
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$this->_file_handle = $fh; |
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|
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$signature = fread($fh, 8); |
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if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) { |
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throw new ReaderException("File doesn't seem to be an OLE container."); |
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} |
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fseek($fh, 28); |
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if (fread($fh, 2) != "\xFE\xFF") { |
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// This shouldn't be a problem in practice |
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throw new ReaderException('Only Little-Endian encoding is supported.'); |
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} |
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// Size of blocks and short blocks in bytes |
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$this->bigBlockSize = pow(2, self::_readInt2($fh)); |
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$this->smallBlockSize = pow(2, self::_readInt2($fh)); |
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|
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// Skip UID, revision number and version number |
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fseek($fh, 44); |
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// Number of blocks in Big Block Allocation Table |
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$bbatBlockCount = self::_readInt4($fh); |
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|
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// Root chain 1st block |
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$directoryFirstBlockId = self::_readInt4($fh); |
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|
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// Skip unused bytes |
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fseek($fh, 56); |
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// Streams shorter than this are stored using small blocks |
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$this->bigBlockThreshold = self::_readInt4($fh); |
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// Block id of first sector in Short Block Allocation Table |
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$sbatFirstBlockId = self::_readInt4($fh); |
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// Number of blocks in Short Block Allocation Table |
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$sbbatBlockCount = self::_readInt4($fh); |
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// Block id of first sector in Master Block Allocation Table |
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$mbatFirstBlockId = self::_readInt4($fh); |
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// Number of blocks in Master Block Allocation Table |
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$mbbatBlockCount = self::_readInt4($fh); |
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$this->bbat = []; |
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|
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// Remaining 4 * 109 bytes of current block is beginning of Master |
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// Block Allocation Table |
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$mbatBlocks = []; |
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for ($i = 0; $i < 109; ++$i) { |
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$mbatBlocks[] = self::_readInt4($fh); |
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} |
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|
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// Read rest of Master Block Allocation Table (if any is left) |
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$pos = $this->_getBlockOffset($mbatFirstBlockId); |
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for ($i = 0; $i < $mbbatBlockCount; ++$i) { |
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fseek($fh, $pos); |
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for ($j = 0; $j < $this->bigBlockSize / 4 - 1; ++$j) { |
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$mbatBlocks[] = self::_readInt4($fh); |
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} |
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// Last block id in each block points to next block |
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$pos = $this->_getBlockOffset(self::_readInt4($fh)); |
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} |
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|
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// Read Big Block Allocation Table according to chain specified by $mbatBlocks |
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for ($i = 0; $i < $bbatBlockCount; ++$i) { |
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$pos = $this->_getBlockOffset($mbatBlocks[$i]); |
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fseek($fh, $pos); |
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for ($j = 0; $j < $this->bigBlockSize / 4; ++$j) { |
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$this->bbat[] = self::_readInt4($fh); |
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} |
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} |
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|
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// Read short block allocation table (SBAT) |
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$this->sbat = []; |
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$shortBlockCount = $sbbatBlockCount * $this->bigBlockSize / 4; |
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$sbatFh = $this->getStream($sbatFirstBlockId); |
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for ($blockId = 0; $blockId < $shortBlockCount; ++$blockId) { |
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$this->sbat[$blockId] = self::_readInt4($sbatFh); |
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} |
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fclose($sbatFh); |
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|
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$this->_readPpsWks($directoryFirstBlockId); |
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|
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return true; |
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} |
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|
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/** |
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* @param int $blockId byte offset from beginning of file |
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* |
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* @return int |
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*/ |
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public function _getBlockOffset($blockId) |
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{ |
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return 512 + $blockId * $this->bigBlockSize; |
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} |
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|
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/** |
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* Returns a stream for use with fread() etc. External callers should |
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* use \PhpOffice\PhpSpreadsheet\Shared\OLE\PPS\File::getStream(). |
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* |
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* @param int|OLE\PPS $blockIdOrPps block id or PPS |
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* |
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* @return resource read-only stream |
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*/ |
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public function getStream($blockIdOrPps) |
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{ |
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static $isRegistered = false; |
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if (!$isRegistered) { |
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stream_wrapper_register('ole-chainedblockstream', ChainedBlockStream::class); |
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$isRegistered = true; |
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} |
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|
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// Store current instance in global array, so that it can be accessed |
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// in OLE_ChainedBlockStream::stream_open(). |
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// Object is removed from self::$instances in OLE_Stream::close(). |
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$GLOBALS['_OLE_INSTANCES'][] = $this; |
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$instanceId = end(array_keys($GLOBALS['_OLE_INSTANCES'])); |
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|
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$path = 'ole-chainedblockstream://oleInstanceId=' . $instanceId; |
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if ($blockIdOrPps instanceof OLE\PPS) { |
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$path .= '&blockId=' . $blockIdOrPps->startBlock; |
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$path .= '&size=' . $blockIdOrPps->Size; |
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} else { |
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$path .= '&blockId=' . $blockIdOrPps; |
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} |
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|
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return fopen($path, 'r'); |
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} |
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|
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/** |
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* Reads a signed char. |
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* |
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* @param resource $fh file handle |
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* |
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* @return int |
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*/ |
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private static function _readInt1($fh) |
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{ |
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list(, $tmp) = unpack('c', fread($fh, 1)); |
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|
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return $tmp; |
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} |
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|
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/** |
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* Reads an unsigned short (2 octets). |
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* |
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* @param resource $fh file handle |
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* |
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* @return int |
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*/ |
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private static function _readInt2($fh) |
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{ |
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list(, $tmp) = unpack('v', fread($fh, 2)); |
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|
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return $tmp; |
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} |
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|
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/** |
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* Reads an unsigned long (4 octets). |
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* |
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* @param resource $fh file handle |
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* |
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* @return int |
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*/ |
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private static function _readInt4($fh) |
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{ |
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list(, $tmp) = unpack('V', fread($fh, 4)); |
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|
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return $tmp; |
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} |
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|
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/** |
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* Gets information about all PPS's on the OLE container from the PPS WK's |
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* creates an OLE_PPS object for each one. |
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* |
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* @param int $blockId the block id of the first block |
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* |
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* @return bool true on success, PEAR_Error on failure |
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*/ |
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public function _readPpsWks($blockId) |
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{ |
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$fh = $this->getStream($blockId); |
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for ($pos = 0; true; $pos += 128) { |
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fseek($fh, $pos, SEEK_SET); |
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$nameUtf16 = fread($fh, 64); |
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$nameLength = self::_readInt2($fh); |
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$nameUtf16 = substr($nameUtf16, 0, $nameLength - 2); |
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// Simple conversion from UTF-16LE to ISO-8859-1 |
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$name = str_replace("\x00", '', $nameUtf16); |
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$type = self::_readInt1($fh); |
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switch ($type) { |
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case self::OLE_PPS_TYPE_ROOT: |
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$pps = new OLE\PPS\Root(null, null, []); |
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$this->root = $pps; |
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|
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break; |
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case self::OLE_PPS_TYPE_DIR: |
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$pps = new OLE\PPS(null, null, null, null, null, null, null, null, null, []); |
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|
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break; |
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case self::OLE_PPS_TYPE_FILE: |
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$pps = new OLE\PPS\File($name); |
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|
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break; |
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default: |
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break; |
| 324 |
} |
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fseek($fh, 1, SEEK_CUR); |
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$pps->Type = $type; |
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$pps->Name = $name; |
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$pps->PrevPps = self::_readInt4($fh); |
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$pps->NextPps = self::_readInt4($fh); |
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$pps->DirPps = self::_readInt4($fh); |
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fseek($fh, 20, SEEK_CUR); |
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$pps->Time1st = self::OLE2LocalDate(fread($fh, 8)); |
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$pps->Time2nd = self::OLE2LocalDate(fread($fh, 8)); |
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$pps->startBlock = self::_readInt4($fh); |
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$pps->Size = self::_readInt4($fh); |
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$pps->No = count($this->_list); |
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$this->_list[] = $pps; |
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|
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// check if the PPS tree (starting from root) is complete |
| 340 |
if (isset($this->root) && $this->_ppsTreeComplete($this->root->No)) { |
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break; |
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} |
| 343 |
} |
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fclose($fh); |
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|
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// Initialize $pps->children on directories |
| 347 |
foreach ($this->_list as $pps) { |
| 348 |
if ($pps->Type == self::OLE_PPS_TYPE_DIR || $pps->Type == self::OLE_PPS_TYPE_ROOT) { |
| 349 |
$nos = [$pps->DirPps]; |
| 350 |
$pps->children = []; |
| 351 |
while ($nos) { |
| 352 |
$no = array_pop($nos); |
| 353 |
if ($no != -1) { |
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$childPps = $this->_list[$no]; |
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$nos[] = $childPps->PrevPps; |
| 356 |
$nos[] = $childPps->NextPps; |
| 357 |
$pps->children[] = $childPps; |
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} |
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} |
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} |
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} |
| 362 |
|
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return true; |
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} |
| 365 |
|
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/** |
| 367 |
* It checks whether the PPS tree is complete (all PPS's read) |
| 368 |
* starting with the given PPS (not necessarily root). |
| 369 |
* |
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* @param int $index The index of the PPS from which we are checking |
| 371 |
* |
| 372 |
* @return bool Whether the PPS tree for the given PPS is complete |
| 373 |
*/ |
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public function _ppsTreeComplete($index) |
| 375 |
{ |
| 376 |
return isset($this->_list[$index]) && |
| 377 |
($pps = $this->_list[$index]) && |
| 378 |
($pps->PrevPps == -1 || |
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$this->_ppsTreeComplete($pps->PrevPps)) && |
| 380 |
($pps->NextPps == -1 || |
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$this->_ppsTreeComplete($pps->NextPps)) && |
| 382 |
($pps->DirPps == -1 || |
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$this->_ppsTreeComplete($pps->DirPps)); |
| 384 |
} |
| 385 |
|
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/** |
| 387 |
* Checks whether a PPS is a File PPS or not. |
| 388 |
* If there is no PPS for the index given, it will return false. |
| 389 |
* |
| 390 |
* @param int $index The index for the PPS |
| 391 |
* |
| 392 |
* @return bool true if it's a File PPS, false otherwise |
| 393 |
*/ |
| 394 |
public function isFile($index) |
| 395 |
{ |
| 396 |
if (isset($this->_list[$index])) { |
| 397 |
return $this->_list[$index]->Type == self::OLE_PPS_TYPE_FILE; |
| 398 |
} |
| 399 |
|
| 400 |
return false; |
| 401 |
} |
| 402 |
|
| 403 |
/** |
| 404 |
* Checks whether a PPS is a Root PPS or not. |
| 405 |
* If there is no PPS for the index given, it will return false. |
| 406 |
* |
| 407 |
* @param int $index the index for the PPS |
| 408 |
* |
| 409 |
* @return bool true if it's a Root PPS, false otherwise |
| 410 |
*/ |
| 411 |
public function isRoot($index) |
| 412 |
{ |
| 413 |
if (isset($this->_list[$index])) { |
| 414 |
return $this->_list[$index]->Type == self::OLE_PPS_TYPE_ROOT; |
| 415 |
} |
| 416 |
|
| 417 |
return false; |
| 418 |
} |
| 419 |
|
| 420 |
/** |
| 421 |
* Gives the total number of PPS's found in the OLE container. |
| 422 |
* |
| 423 |
* @return int The total number of PPS's found in the OLE container |
| 424 |
*/ |
| 425 |
public function ppsTotal() |
| 426 |
{ |
| 427 |
return count($this->_list); |
| 428 |
} |
| 429 |
|
| 430 |
/** |
| 431 |
* Gets data from a PPS |
| 432 |
* If there is no PPS for the index given, it will return an empty string. |
| 433 |
* |
| 434 |
* @param int $index The index for the PPS |
| 435 |
* @param int $position The position from which to start reading |
| 436 |
* (relative to the PPS) |
| 437 |
* @param int $length The amount of bytes to read (at most) |
| 438 |
* |
| 439 |
* @return string The binary string containing the data requested |
| 440 |
* |
| 441 |
* @see OLE_PPS_File::getStream() |
| 442 |
*/ |
| 443 |
public function getData($index, $position, $length) |
| 444 |
{ |
| 445 |
// if position is not valid return empty string |
| 446 |
if (!isset($this->_list[$index]) || ($position >= $this->_list[$index]->Size) || ($position < 0)) { |
| 447 |
return ''; |
| 448 |
} |
| 449 |
$fh = $this->getStream($this->_list[$index]); |
| 450 |
$data = stream_get_contents($fh, $length, $position); |
| 451 |
fclose($fh); |
| 452 |
|
| 453 |
return $data; |
| 454 |
} |
| 455 |
|
| 456 |
/** |
| 457 |
* Gets the data length from a PPS |
| 458 |
* If there is no PPS for the index given, it will return 0. |
| 459 |
* |
| 460 |
* @param int $index The index for the PPS |
| 461 |
* |
| 462 |
* @return int The amount of bytes in data the PPS has |
| 463 |
*/ |
| 464 |
public function getDataLength($index) |
| 465 |
{ |
| 466 |
if (isset($this->_list[$index])) { |
| 467 |
return $this->_list[$index]->Size; |
| 468 |
} |
| 469 |
|
| 470 |
return 0; |
| 471 |
} |
| 472 |
|
| 473 |
/** |
| 474 |
* Utility function to transform ASCII text to Unicode. |
| 475 |
* |
| 476 |
* @param string $ascii The ASCII string to transform |
| 477 |
* |
| 478 |
* @return string The string in Unicode |
| 479 |
*/ |
| 480 |
public static function ascToUcs($ascii) |
| 481 |
{ |
| 482 |
$rawname = ''; |
| 483 |
$iMax = strlen($ascii); |
| 484 |
for ($i = 0; $i < $iMax; ++$i) { |
| 485 |
$rawname .= $ascii[$i] |
| 486 |
. "\x00"; |
| 487 |
} |
| 488 |
|
| 489 |
return $rawname; |
| 490 |
} |
| 491 |
|
| 492 |
/** |
| 493 |
* Utility function |
| 494 |
* Returns a string for the OLE container with the date given. |
| 495 |
* |
| 496 |
* @param int $date A timestamp |
| 497 |
* |
| 498 |
* @return string The string for the OLE container |
| 499 |
*/ |
| 500 |
public static function localDateToOLE($date) |
| 501 |
{ |
| 502 |
if (!isset($date)) { |
| 503 |
return "\x00\x00\x00\x00\x00\x00\x00\x00"; |
| 504 |
} |
| 505 |
|
| 506 |
// factor used for separating numbers into 4 bytes parts |
| 507 |
$factor = pow(2, 32); |
| 508 |
|
| 509 |
// days from 1-1-1601 until the beggining of UNIX era |
| 510 |
$days = 134774; |
| 511 |
// calculate seconds |
| 512 |
$big_date = $days * 24 * 3600 + gmmktime(date('H', $date), date('i', $date), date('s', $date), date('m', $date), date('d', $date), date('Y', $date)); |
| 513 |
// multiply just to make MS happy |
| 514 |
$big_date *= 10000000; |
| 515 |
|
| 516 |
$high_part = floor($big_date / $factor); |
| 517 |
// lower 4 bytes |
| 518 |
$low_part = floor((($big_date / $factor) - $high_part) * $factor); |
| 519 |
|
| 520 |
// Make HEX string |
| 521 |
$res = ''; |
| 522 |
|
| 523 |
for ($i = 0; $i < 4; ++$i) { |
| 524 |
$hex = $low_part % 0x100; |
| 525 |
$res .= pack('c', $hex); |
| 526 |
$low_part /= 0x100; |
| 527 |
} |
| 528 |
for ($i = 0; $i < 4; ++$i) { |
| 529 |
$hex = $high_part % 0x100; |
| 530 |
$res .= pack('c', $hex); |
| 531 |
$high_part /= 0x100; |
| 532 |
} |
| 533 |
|
| 534 |
return $res; |
| 535 |
} |
| 536 |
|
| 537 |
/** |
| 538 |
* Returns a timestamp from an OLE container's date. |
| 539 |
* |
| 540 |
* @param string $oleTimestamp A binary string with the encoded date |
| 541 |
* |
| 542 |
* @throws ReaderException |
| 543 |
* |
| 544 |
* @return int The Unix timestamp corresponding to the string |
| 545 |
*/ |
| 546 |
public static function OLE2LocalDate($oleTimestamp) |
| 547 |
{ |
| 548 |
if (strlen($oleTimestamp) != 8) { |
| 549 |
throw new ReaderException('Expecting 8 byte string'); |
| 550 |
} |
| 551 |
|
| 552 |
// convert to units of 100 ns since 1601: |
| 553 |
$unpackedTimestamp = unpack('v4', $oleTimestamp); |
| 554 |
$timestampHigh = (float) $unpackedTimestamp[4] * 65536 + (float) $unpackedTimestamp[3]; |
| 555 |
$timestampLow = (float) $unpackedTimestamp[2] * 65536 + (float) $unpackedTimestamp[1]; |
| 556 |
|
| 557 |
// translate to seconds since 1601: |
| 558 |
$timestampHigh /= 10000000; |
| 559 |
$timestampLow /= 10000000; |
| 560 |
|
| 561 |
// days from 1601 to 1970: |
| 562 |
$days = 134774; |
| 563 |
|
| 564 |
// translate to seconds since 1970: |
| 565 |
$unixTimestamp = floor(65536.0 * 65536.0 * $timestampHigh + $timestampLow - $days * 24 * 3600 + 0.5); |
| 566 |
|
| 567 |
if ((int) $unixTimestamp == $unixTimestamp) { |
| 568 |
return (int) $unixTimestamp; |
| 569 |
} |
| 570 |
|
| 571 |
return $unixTimestamp >= 0.0 ? PHP_INT_MAX : PHP_INT_MIN; |
| 572 |
} |
| 573 |
} |
| 574 |
|
