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<?php
/**
* This file is part of PHPOffice Common
*
* PHPOffice Common is free software distributed under the terms of the GNU Lesser
* General Public License version 3 as published by the Free Software Foundation.
*
* For the full copyright and license information, please read the LICENSE
* file that was distributed with this source code. For the full list of
* contributors, visit https://github.com/PHPOffice/Common/contributors.
*
* @link https://github.com/PHPOffice/Common
* @copyright 2009-2016 PHPOffice Common contributors
* @license http://www.gnu.org/licenses/lgpl.txt LGPL version 3
*/
namespace PhpOffice\Common\Microsoft;
if (!defined('IDENTIFIER_OLE')) {
define('IDENTIFIER_OLE', pack('CCCCCCCC', 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1));
}
class 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 $summaryInformation = null;
public $docSummaryInfos = null;
public $powerpointDocument = null;
public $currentUser = null;
public $pictures = null;
public $rootEntry = null;
public $props = array();
public $smallBlockChain = null;
public $bigBlockChain = null;
public $entry = null;
/**
* Read the file
*
* @param $sFileName string Filename
* @throws \Exception
*/
public function read($sFileName)
{
// Check if file exists and is readable
if (!is_readable($sFileName)) {
throw new \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 \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
$numBigBlkDepotBlks = self::getInt4d($this->data, self::NUM_BIG_BLOCK_DEPOT_BLOCKS_POS);
// SecID of the first sector of the directory stream
$rootStartBlock = self::getInt4d($this->data, self::ROOT_START_BLOCK_POS);
// SecID of the first sector of the SSAT (or -2 if not extant)
$sbdStartBlock = self::getInt4d($this->data, self::SMALL_BLOCK_DEPOT_BLOCK_POS);
// SecID of the first sector of the MSAT (or -2 if no additional sectors are used)
$extensionBlock = self::getInt4d($this->data, self::EXTENSION_BLOCK_POS);
// Total number of sectors used by MSAT
$numExtensionBlocks = self::getInt4d($this->data, self::NUM_EXTENSION_BLOCK_POS);
$bigBlockDepotBlocks = array();
$pos = self::BIG_BLOCK_DEPOT_BLOCKS_POS;
$bbdBlocks = $numBigBlkDepotBlks;
if ($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 < $numExtensionBlocks; ++$j) {
$pos = ($extensionBlock + 1) * self::BIG_BLOCK_SIZE;
$blocksToRead = min($numBigBlkDepotBlks - $bbdBlocks, self::BIG_BLOCK_SIZE / 4 - 1);
for ($i = $bbdBlocks; $i < $bbdBlocks + $blocksToRead; ++$i) {
$bigBlockDepotBlocks[$i] = self::getInt4d($this->data, $pos);
$pos += 4;
}
$bbdBlocks += $blocksToRead;
if ($bbdBlocks < $numBigBlkDepotBlks) {
$extensionBlock = self::getInt4d($this->data, $pos);
}
}
$this->bigBlockChain = '';
$bbs = self::BIG_BLOCK_SIZE / 4;
for ($i = 0; $i < $numBigBlkDepotBlks; ++$i) {
$pos = ($bigBlockDepotBlocks[$i] + 1) * self::BIG_BLOCK_SIZE;
$this->bigBlockChain .= substr($this->data, $pos, 4*$bbs);
$pos += 4*$bbs;
}
$sbdBlock = $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 = $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;
}
$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 $blID Sector ID where the stream starts
* @return string Data for standard stream
*/
private function readData($blID)
{
$block = $blID;
$data = '';
while ($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)
$data = substr($this->entry, $offset, self::PROPERTY_STORAGE_BLOCK_SIZE);
// size in bytes of name
$nameSize = ord($data[self::SIZE_OF_NAME_POS]) | (ord($data[self::SIZE_OF_NAME_POS+1]) << 8);
// type of entry
$type = ord($data[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
$startBlock = self::getInt4d($data, self::START_BLOCK_POS);
$size = self::getInt4d($data, self::SIZE_POS);
$name = str_replace("\x00", "", substr($data, 0, $nameSize));
if ($size > 0) {
$this->props[] = array (
'name' => $name,
'type' => $type,
'startBlock' => $startBlock,
'size' => $size);
// tmp helper to simplify checks
$upName = strtoupper($name);
switch ($upName) {
case 'ROOT ENTRY':
case 'R':
$this->rootEntry = count($this->props) - 1;
break;
case chr(1).'COMPOBJ':
break;
case chr(1).'OLE':
break;
case chr(5).'SUMMARYINFORMATION':
$this->summaryInformation = count($this->props) - 1;
break;
case chr(5).'DOCUMENTSUMMARYINFORMATION':
$this->docSummaryInfos = count($this->props) - 1;
break;
case 'CURRENT USER':
$this->currentUser = count($this->props) - 1;
break;
case 'PICTURES':
$this->pictures = count($this->props) - 1;
break;
case 'POWERPOINT DOCUMENT':
$this->powerpointDocument = count($this->props) - 1;
break;
default:
throw new \Exception('OLE Block Not defined: $upName : '.$upName. ' - $name : "'.$name.'"');
}
}
$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
$or24 = ord($data[$pos + 3]);
if ($or24 >= 128) {
// negative number
$ord24 = -abs((256 - $or24) << 24);
} else {
$ord24 = ($or24 & 127) << 24;
}
return ord($data[$pos]) | (ord($data[$pos + 1]) << 8) | (ord($data[$pos + 2]) << 16) | $ord24;
}
}