[1] | 1 | <?php |
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| 2 | /* vim: set expandtab tabstop=4 shiftwidth=4: */ |
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| 3 | // +----------------------------------------------------------------------+ |
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| 4 | // | PHP Version 4 | |
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| 5 | // +----------------------------------------------------------------------+ |
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| 6 | // | Copyright (c) 1997-2002 The PHP Group | |
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| 7 | // +----------------------------------------------------------------------+ |
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| 8 | // | This source file is subject to version 2.02 of the PHP license, | |
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| 9 | // | that is bundled with this package in the file LICENSE, and is | |
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| 10 | // | available at through the world-wide-web at | |
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| 11 | // | http://www.php.net/license/2_02.txt. | |
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| 12 | // | If you did not receive a copy of the PHP license and are unable to | |
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| 13 | // | obtain it through the world-wide-web, please send a note to | |
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| 14 | // | license@php.net so we can mail you a copy immediately. | |
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| 15 | // +----------------------------------------------------------------------+ |
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| 16 | // | Author: Xavier Noguer <xnoguer@php.net> | |
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| 17 | // | Based on OLE::Storage_Lite by Kawai, Takanori | |
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| 18 | // +----------------------------------------------------------------------+ |
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| 19 | // |
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| 20 | // $Id: OLE.php,v 1.13 2007/03/07 14:38:25 schmidt Exp $ |
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| 21 | |
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| 22 | |
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| 23 | /** |
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| 24 | * Array for storing OLE instances that are accessed from |
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| 25 | * OLE_ChainedBlockStream::stream_open(). |
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| 26 | * @var array |
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| 27 | */ |
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| 28 | $GLOBALS['_OLE_INSTANCES'] = array(); |
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| 29 | |
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| 30 | /** |
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| 31 | * OLE package base class. |
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| 32 | * |
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| 33 | * @author Xavier Noguer <xnoguer@php.net> |
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| 34 | * @author Christian Schmidt <schmidt@php.net> |
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| 35 | * @category PHPExcel |
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| 36 | * @package PHPExcel_Shared_OLE |
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| 37 | */ |
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| 38 | class PHPExcel_Shared_OLE |
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| 39 | { |
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| 40 | const OLE_PPS_TYPE_ROOT = 5; |
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| 41 | const OLE_PPS_TYPE_DIR = 1; |
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| 42 | const OLE_PPS_TYPE_FILE = 2; |
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| 43 | const OLE_DATA_SIZE_SMALL = 0x1000; |
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| 44 | const OLE_LONG_INT_SIZE = 4; |
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| 45 | const OLE_PPS_SIZE = 0x80; |
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| 46 | |
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| 47 | /** |
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| 48 | * The file handle for reading an OLE container |
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| 49 | * @var resource |
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| 50 | */ |
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| 51 | public $_file_handle; |
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| 52 | |
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| 53 | /** |
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| 54 | * Array of PPS's found on the OLE container |
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| 55 | * @var array |
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| 56 | */ |
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| 57 | public $_list = array(); |
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| 58 | |
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| 59 | /** |
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| 60 | * Root directory of OLE container |
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| 61 | * @var OLE_PPS_Root |
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| 62 | */ |
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| 63 | public $root; |
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| 64 | |
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| 65 | /** |
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| 66 | * Big Block Allocation Table |
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| 67 | * @var array (blockId => nextBlockId) |
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| 68 | */ |
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| 69 | public $bbat; |
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| 70 | |
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| 71 | /** |
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| 72 | * Short Block Allocation Table |
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| 73 | * @var array (blockId => nextBlockId) |
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| 74 | */ |
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| 75 | public $sbat; |
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| 76 | |
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| 77 | /** |
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| 78 | * Size of big blocks. This is usually 512. |
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| 79 | * @var int number of octets per block. |
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| 80 | */ |
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| 81 | public $bigBlockSize; |
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| 82 | |
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| 83 | /** |
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| 84 | * Size of small blocks. This is usually 64. |
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| 85 | * @var int number of octets per block |
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| 86 | */ |
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| 87 | public $smallBlockSize; |
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| 88 | |
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| 89 | /** |
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| 90 | * Reads an OLE container from the contents of the file given. |
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| 91 | * |
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| 92 | * @acces public |
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| 93 | * @param string $file |
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| 94 | * @return mixed true on success, PEAR_Error on failure |
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| 95 | */ |
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| 96 | public function read($file) |
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| 97 | { |
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| 98 | $fh = fopen($file, "r"); |
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| 99 | if (!$fh) { |
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| 100 | throw new PHPExcel_Reader_Exception("Can't open file $file"); |
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| 101 | } |
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| 102 | $this->_file_handle = $fh; |
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| 103 | |
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| 104 | $signature = fread($fh, 8); |
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| 105 | if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) { |
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| 106 | throw new PHPExcel_Reader_Exception("File doesn't seem to be an OLE container."); |
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| 107 | } |
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| 108 | fseek($fh, 28); |
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| 109 | if (fread($fh, 2) != "\xFE\xFF") { |
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| 110 | // This shouldn't be a problem in practice |
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| 111 | throw new PHPExcel_Reader_Exception("Only Little-Endian encoding is supported."); |
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| 112 | } |
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| 113 | // Size of blocks and short blocks in bytes |
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| 114 | $this->bigBlockSize = pow(2, self::_readInt2($fh)); |
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| 115 | $this->smallBlockSize = pow(2, self::_readInt2($fh)); |
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| 116 | |
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| 117 | // Skip UID, revision number and version number |
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| 118 | fseek($fh, 44); |
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| 119 | // Number of blocks in Big Block Allocation Table |
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| 120 | $bbatBlockCount = self::_readInt4($fh); |
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| 121 | |
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| 122 | // Root chain 1st block |
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| 123 | $directoryFirstBlockId = self::_readInt4($fh); |
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| 124 | |
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| 125 | // Skip unused bytes |
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| 126 | fseek($fh, 56); |
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| 127 | // Streams shorter than this are stored using small blocks |
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| 128 | $this->bigBlockThreshold = self::_readInt4($fh); |
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| 129 | // Block id of first sector in Short Block Allocation Table |
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| 130 | $sbatFirstBlockId = self::_readInt4($fh); |
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| 131 | // Number of blocks in Short Block Allocation Table |
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| 132 | $sbbatBlockCount = self::_readInt4($fh); |
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| 133 | // Block id of first sector in Master Block Allocation Table |
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| 134 | $mbatFirstBlockId = self::_readInt4($fh); |
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| 135 | // Number of blocks in Master Block Allocation Table |
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| 136 | $mbbatBlockCount = self::_readInt4($fh); |
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| 137 | $this->bbat = array(); |
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| 138 | |
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| 139 | // Remaining 4 * 109 bytes of current block is beginning of Master |
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| 140 | // Block Allocation Table |
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| 141 | $mbatBlocks = array(); |
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| 142 | for ($i = 0; $i < 109; ++$i) { |
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| 143 | $mbatBlocks[] = self::_readInt4($fh); |
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| 144 | } |
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| 145 | |
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| 146 | // Read rest of Master Block Allocation Table (if any is left) |
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| 147 | $pos = $this->_getBlockOffset($mbatFirstBlockId); |
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| 148 | for ($i = 0; $i < $mbbatBlockCount; ++$i) { |
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| 149 | fseek($fh, $pos); |
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| 150 | for ($j = 0; $j < $this->bigBlockSize / 4 - 1; ++$j) { |
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| 151 | $mbatBlocks[] = self::_readInt4($fh); |
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| 152 | } |
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| 153 | // Last block id in each block points to next block |
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| 154 | $pos = $this->_getBlockOffset(self::_readInt4($fh)); |
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| 155 | } |
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| 156 | |
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| 157 | // Read Big Block Allocation Table according to chain specified by |
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| 158 | // $mbatBlocks |
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| 159 | for ($i = 0; $i < $bbatBlockCount; ++$i) { |
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| 160 | $pos = $this->_getBlockOffset($mbatBlocks[$i]); |
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| 161 | fseek($fh, $pos); |
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| 162 | for ($j = 0 ; $j < $this->bigBlockSize / 4; ++$j) { |
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| 163 | $this->bbat[] = self::_readInt4($fh); |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | // Read short block allocation table (SBAT) |
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| 168 | $this->sbat = array(); |
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| 169 | $shortBlockCount = $sbbatBlockCount * $this->bigBlockSize / 4; |
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| 170 | $sbatFh = $this->getStream($sbatFirstBlockId); |
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| 171 | for ($blockId = 0; $blockId < $shortBlockCount; ++$blockId) { |
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| 172 | $this->sbat[$blockId] = self::_readInt4($sbatFh); |
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| 173 | } |
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| 174 | fclose($sbatFh); |
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| 175 | |
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| 176 | $this->_readPpsWks($directoryFirstBlockId); |
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| 177 | |
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| 178 | return true; |
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| 179 | } |
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| 180 | |
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| 181 | /** |
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| 182 | * @param int block id |
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| 183 | * @param int byte offset from beginning of file |
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| 184 | * @access public |
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| 185 | */ |
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| 186 | public function _getBlockOffset($blockId) |
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| 187 | { |
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| 188 | return 512 + $blockId * $this->bigBlockSize; |
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| 189 | } |
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| 190 | |
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| 191 | /** |
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| 192 | * Returns a stream for use with fread() etc. External callers should |
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| 193 | * use PHPExcel_Shared_OLE_PPS_File::getStream(). |
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| 194 | * @param int|PPS block id or PPS |
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| 195 | * @return resource read-only stream |
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| 196 | */ |
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| 197 | public function getStream($blockIdOrPps) |
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| 198 | { |
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| 199 | static $isRegistered = false; |
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| 200 | if (!$isRegistered) { |
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| 201 | stream_wrapper_register('ole-chainedblockstream', |
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| 202 | 'PHPExcel_Shared_OLE_ChainedBlockStream'); |
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| 203 | $isRegistered = true; |
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| 204 | } |
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| 205 | |
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| 206 | // Store current instance in global array, so that it can be accessed |
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| 207 | // in OLE_ChainedBlockStream::stream_open(). |
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| 208 | // Object is removed from self::$instances in OLE_Stream::close(). |
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| 209 | $GLOBALS['_OLE_INSTANCES'][] = $this; |
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| 210 | $instanceId = end(array_keys($GLOBALS['_OLE_INSTANCES'])); |
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| 211 | |
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| 212 | $path = 'ole-chainedblockstream://oleInstanceId=' . $instanceId; |
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| 213 | if ($blockIdOrPps instanceof PHPExcel_Shared_OLE_PPS) { |
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| 214 | $path .= '&blockId=' . $blockIdOrPps->_StartBlock; |
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| 215 | $path .= '&size=' . $blockIdOrPps->Size; |
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| 216 | } else { |
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| 217 | $path .= '&blockId=' . $blockIdOrPps; |
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| 218 | } |
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| 219 | return fopen($path, 'r'); |
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| 220 | } |
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| 221 | |
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| 222 | /** |
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| 223 | * Reads a signed char. |
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| 224 | * @param resource file handle |
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| 225 | * @return int |
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| 226 | * @access public |
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| 227 | */ |
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| 228 | private static function _readInt1($fh) |
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| 229 | { |
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| 230 | list(, $tmp) = unpack("c", fread($fh, 1)); |
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| 231 | return $tmp; |
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| 232 | } |
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| 233 | |
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| 234 | /** |
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| 235 | * Reads an unsigned short (2 octets). |
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| 236 | * @param resource file handle |
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| 237 | * @return int |
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| 238 | * @access public |
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| 239 | */ |
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| 240 | private static function _readInt2($fh) |
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| 241 | { |
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| 242 | list(, $tmp) = unpack("v", fread($fh, 2)); |
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| 243 | return $tmp; |
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| 244 | } |
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| 245 | |
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| 246 | /** |
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| 247 | * Reads an unsigned long (4 octets). |
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| 248 | * @param resource file handle |
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| 249 | * @return int |
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| 250 | * @access public |
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| 251 | */ |
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| 252 | private static function _readInt4($fh) |
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| 253 | { |
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| 254 | list(, $tmp) = unpack("V", fread($fh, 4)); |
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| 255 | return $tmp; |
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| 256 | } |
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| 257 | |
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| 258 | /** |
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| 259 | * Gets information about all PPS's on the OLE container from the PPS WK's |
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| 260 | * creates an OLE_PPS object for each one. |
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| 261 | * |
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| 262 | * @access public |
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| 263 | * @param integer the block id of the first block |
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| 264 | * @return mixed true on success, PEAR_Error on failure |
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| 265 | */ |
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| 266 | public function _readPpsWks($blockId) |
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| 267 | { |
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| 268 | $fh = $this->getStream($blockId); |
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| 269 | for ($pos = 0; ; $pos += 128) { |
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| 270 | fseek($fh, $pos, SEEK_SET); |
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| 271 | $nameUtf16 = fread($fh, 64); |
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| 272 | $nameLength = self::_readInt2($fh); |
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| 273 | $nameUtf16 = substr($nameUtf16, 0, $nameLength - 2); |
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| 274 | // Simple conversion from UTF-16LE to ISO-8859-1 |
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| 275 | $name = str_replace("\x00", "", $nameUtf16); |
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| 276 | $type = self::_readInt1($fh); |
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| 277 | switch ($type) { |
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| 278 | case self::OLE_PPS_TYPE_ROOT: |
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| 279 | $pps = new PHPExcel_Shared_OLE_PPS_Root(null, null, array()); |
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| 280 | $this->root = $pps; |
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| 281 | break; |
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| 282 | case self::OLE_PPS_TYPE_DIR: |
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| 283 | $pps = new PHPExcel_Shared_OLE_PPS(null, null, null, null, null, |
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| 284 | null, null, null, null, array()); |
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| 285 | break; |
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| 286 | case self::OLE_PPS_TYPE_FILE: |
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| 287 | $pps = new PHPExcel_Shared_OLE_PPS_File($name); |
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| 288 | break; |
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| 289 | default: |
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| 290 | continue; |
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| 291 | } |
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| 292 | fseek($fh, 1, SEEK_CUR); |
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| 293 | $pps->Type = $type; |
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| 294 | $pps->Name = $name; |
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| 295 | $pps->PrevPps = self::_readInt4($fh); |
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| 296 | $pps->NextPps = self::_readInt4($fh); |
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| 297 | $pps->DirPps = self::_readInt4($fh); |
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| 298 | fseek($fh, 20, SEEK_CUR); |
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| 299 | $pps->Time1st = self::OLE2LocalDate(fread($fh, 8)); |
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| 300 | $pps->Time2nd = self::OLE2LocalDate(fread($fh, 8)); |
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| 301 | $pps->_StartBlock = self::_readInt4($fh); |
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| 302 | $pps->Size = self::_readInt4($fh); |
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| 303 | $pps->No = count($this->_list); |
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| 304 | $this->_list[] = $pps; |
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| 305 | |
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| 306 | // check if the PPS tree (starting from root) is complete |
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| 307 | if (isset($this->root) && |
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| 308 | $this->_ppsTreeComplete($this->root->No)) { |
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| 309 | |
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| 310 | break; |
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| 311 | } |
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| 312 | } |
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| 313 | fclose($fh); |
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| 314 | |
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| 315 | // Initialize $pps->children on directories |
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| 316 | foreach ($this->_list as $pps) { |
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| 317 | if ($pps->Type == self::OLE_PPS_TYPE_DIR || $pps->Type == self::OLE_PPS_TYPE_ROOT) { |
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| 318 | $nos = array($pps->DirPps); |
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| 319 | $pps->children = array(); |
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| 320 | while ($nos) { |
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| 321 | $no = array_pop($nos); |
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| 322 | if ($no != -1) { |
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| 323 | $childPps = $this->_list[$no]; |
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| 324 | $nos[] = $childPps->PrevPps; |
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| 325 | $nos[] = $childPps->NextPps; |
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| 326 | $pps->children[] = $childPps; |
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| 327 | } |
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| 328 | } |
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| 329 | } |
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| 330 | } |
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| 331 | |
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| 332 | return true; |
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| 333 | } |
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| 334 | |
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| 335 | /** |
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| 336 | * It checks whether the PPS tree is complete (all PPS's read) |
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| 337 | * starting with the given PPS (not necessarily root) |
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| 338 | * |
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| 339 | * @access public |
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| 340 | * @param integer $index The index of the PPS from which we are checking |
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| 341 | * @return boolean Whether the PPS tree for the given PPS is complete |
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| 342 | */ |
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| 343 | public function _ppsTreeComplete($index) |
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| 344 | { |
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| 345 | return isset($this->_list[$index]) && |
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| 346 | ($pps = $this->_list[$index]) && |
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| 347 | ($pps->PrevPps == -1 || |
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| 348 | $this->_ppsTreeComplete($pps->PrevPps)) && |
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| 349 | ($pps->NextPps == -1 || |
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| 350 | $this->_ppsTreeComplete($pps->NextPps)) && |
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| 351 | ($pps->DirPps == -1 || |
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| 352 | $this->_ppsTreeComplete($pps->DirPps)); |
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| 353 | } |
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| 354 | |
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| 355 | /** |
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| 356 | * Checks whether a PPS is a File PPS or not. |
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| 357 | * If there is no PPS for the index given, it will return false. |
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| 358 | * |
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| 359 | * @access public |
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| 360 | * @param integer $index The index for the PPS |
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| 361 | * @return bool true if it's a File PPS, false otherwise |
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| 362 | */ |
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| 363 | public function isFile($index) |
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| 364 | { |
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| 365 | if (isset($this->_list[$index])) { |
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| 366 | return ($this->_list[$index]->Type == self::OLE_PPS_TYPE_FILE); |
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| 367 | } |
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| 368 | return false; |
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| 369 | } |
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| 370 | |
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| 371 | /** |
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| 372 | * Checks whether a PPS is a Root PPS or not. |
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| 373 | * If there is no PPS for the index given, it will return false. |
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| 374 | * |
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| 375 | * @access public |
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| 376 | * @param integer $index The index for the PPS. |
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| 377 | * @return bool true if it's a Root PPS, false otherwise |
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| 378 | */ |
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| 379 | public function isRoot($index) |
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| 380 | { |
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| 381 | if (isset($this->_list[$index])) { |
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| 382 | return ($this->_list[$index]->Type == self::OLE_PPS_TYPE_ROOT); |
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| 383 | } |
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| 384 | return false; |
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| 385 | } |
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| 386 | |
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| 387 | /** |
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| 388 | * Gives the total number of PPS's found in the OLE container. |
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| 389 | * |
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| 390 | * @access public |
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| 391 | * @return integer The total number of PPS's found in the OLE container |
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| 392 | */ |
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| 393 | public function ppsTotal() |
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| 394 | { |
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| 395 | return count($this->_list); |
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| 396 | } |
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| 397 | |
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| 398 | /** |
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| 399 | * Gets data from a PPS |
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| 400 | * If there is no PPS for the index given, it will return an empty string. |
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| 401 | * |
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| 402 | * @access public |
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| 403 | * @param integer $index The index for the PPS |
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| 404 | * @param integer $position The position from which to start reading |
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| 405 | * (relative to the PPS) |
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| 406 | * @param integer $length The amount of bytes to read (at most) |
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| 407 | * @return string The binary string containing the data requested |
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| 408 | * @see OLE_PPS_File::getStream() |
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| 409 | */ |
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| 410 | public function getData($index, $position, $length) |
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| 411 | { |
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| 412 | // if position is not valid return empty string |
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| 413 | if (!isset($this->_list[$index]) || ($position >= $this->_list[$index]->Size) || ($position < 0)) { |
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| 414 | return ''; |
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| 415 | } |
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| 416 | $fh = $this->getStream($this->_list[$index]); |
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| 417 | $data = stream_get_contents($fh, $length, $position); |
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| 418 | fclose($fh); |
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| 419 | return $data; |
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| 420 | } |
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| 421 | |
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| 422 | /** |
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| 423 | * Gets the data length from a PPS |
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| 424 | * If there is no PPS for the index given, it will return 0. |
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| 425 | * |
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| 426 | * @access public |
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| 427 | * @param integer $index The index for the PPS |
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| 428 | * @return integer The amount of bytes in data the PPS has |
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| 429 | */ |
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| 430 | public function getDataLength($index) |
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| 431 | { |
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| 432 | if (isset($this->_list[$index])) { |
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| 433 | return $this->_list[$index]->Size; |
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| 434 | } |
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| 435 | return 0; |
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| 436 | } |
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| 437 | |
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| 438 | /** |
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| 439 | * Utility function to transform ASCII text to Unicode |
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| 440 | * |
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| 441 | * @access public |
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| 442 | * @static |
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| 443 | * @param string $ascii The ASCII string to transform |
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| 444 | * @return string The string in Unicode |
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| 445 | */ |
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| 446 | public static function Asc2Ucs($ascii) |
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| 447 | { |
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| 448 | $rawname = ''; |
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| 449 | for ($i = 0; $i < strlen($ascii); ++$i) { |
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| 450 | $rawname .= $ascii{$i} . "\x00"; |
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| 451 | } |
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| 452 | return $rawname; |
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| 453 | } |
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| 454 | |
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| 455 | /** |
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| 456 | * Utility function |
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| 457 | * Returns a string for the OLE container with the date given |
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| 458 | * |
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| 459 | * @access public |
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| 460 | * @static |
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| 461 | * @param integer $date A timestamp |
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| 462 | * @return string The string for the OLE container |
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| 463 | */ |
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| 464 | public static function LocalDate2OLE($date = null) |
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| 465 | { |
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| 466 | if (!isset($date)) { |
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| 467 | return "\x00\x00\x00\x00\x00\x00\x00\x00"; |
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| 468 | } |
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| 469 | |
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| 470 | // factor used for separating numbers into 4 bytes parts |
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| 471 | $factor = pow(2, 32); |
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| 472 | |
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| 473 | // days from 1-1-1601 until the beggining of UNIX era |
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| 474 | $days = 134774; |
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| 475 | // calculate seconds |
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| 476 | $big_date = $days*24*3600 + gmmktime(date("H",$date),date("i",$date),date("s",$date), |
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| 477 | date("m",$date),date("d",$date),date("Y",$date)); |
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| 478 | // multiply just to make MS happy |
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| 479 | $big_date *= 10000000; |
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| 480 | |
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| 481 | $high_part = floor($big_date / $factor); |
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| 482 | // lower 4 bytes |
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| 483 | $low_part = floor((($big_date / $factor) - $high_part) * $factor); |
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| 484 | |
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| 485 | // Make HEX string |
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| 486 | $res = ''; |
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| 487 | |
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| 488 | for ($i = 0; $i < 4; ++$i) { |
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| 489 | $hex = $low_part % 0x100; |
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| 490 | $res .= pack('c', $hex); |
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| 491 | $low_part /= 0x100; |
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| 492 | } |
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| 493 | for ($i = 0; $i < 4; ++$i) { |
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| 494 | $hex = $high_part % 0x100; |
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| 495 | $res .= pack('c', $hex); |
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| 496 | $high_part /= 0x100; |
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| 497 | } |
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| 498 | return $res; |
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| 499 | } |
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| 500 | |
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| 501 | /** |
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| 502 | * Returns a timestamp from an OLE container's date |
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| 503 | * |
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| 504 | * @access public |
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| 505 | * @static |
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| 506 | * @param integer $string A binary string with the encoded date |
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| 507 | * @return string The timestamp corresponding to the string |
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| 508 | */ |
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| 509 | public static function OLE2LocalDate($string) |
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| 510 | { |
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| 511 | if (strlen($string) != 8) { |
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| 512 | return new PEAR_Error("Expecting 8 byte string"); |
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| 513 | } |
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| 514 | |
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| 515 | // factor used for separating numbers into 4 bytes parts |
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| 516 | $factor = pow(2,32); |
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| 517 | list(, $high_part) = unpack('V', substr($string, 4, 4)); |
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| 518 | list(, $low_part) = unpack('V', substr($string, 0, 4)); |
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| 519 | |
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| 520 | $big_date = ($high_part * $factor) + $low_part; |
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| 521 | // translate to seconds |
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| 522 | $big_date /= 10000000; |
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| 523 | |
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| 524 | // days from 1-1-1601 until the beggining of UNIX era |
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| 525 | $days = 134774; |
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| 526 | |
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| 527 | // translate to seconds from beggining of UNIX era |
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| 528 | $big_date -= $days * 24 * 3600; |
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| 529 | return floor($big_date); |
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| 530 | } |
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| 531 | } |
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