File Source for OLE.php

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Author: Xavier Noguer <xnoguer@php.net> |
// | Based on OLE::Storage_Lite by Kawai, Takanori |
// +----------------------------------------------------------------------+
//
// $Id: OLE.php,v 1.13 2007/03/07 14:38:25 schmidt Exp $
/**
* Array for storing OLE instances that are accessed from
* OLE_ChainedBlockStream::stream_open().
* @var array
*/
$GLOBALS['_OLE_INSTANCES'] = array();
/**
* OLE package base class.
*
* @author Xavier Noguer <xnoguer@php.net>
* @author Christian Schmidt <schmidt@php.net>
* @category PHPExcel
* @package PHPExcel_Shared_OLE
*/
class PHPExcel_Shared_OLE
{
const OLE_PPS_TYPE_ROOT = 5;
const OLE_PPS_TYPE_DIR = 1;
const OLE_PPS_TYPE_FILE = 2;
const OLE_DATA_SIZE_SMALL = 0x1000;
const OLE_LONG_INT_SIZE = 4;
const OLE_PPS_SIZE = 0x80;
/**
* The file handle for reading an OLE container
* @var resource
*/
public $_file_handle;
/**
* Array of PPS's found on the OLE container
* @var array
*/
public $_list = array();
/**
* Root directory of OLE container
* @var OLE_PPS_Root
*/
public $root;
/**
* Big Block Allocation Table
* @var array (blockId => nextBlockId)
*/
public $bbat;
/**
* Short Block Allocation Table
* @var array (blockId => nextBlockId)
*/
public $sbat;
/**
* Size of big blocks. This is usually 512.
* @var int number of octets per block.
*/
public $bigBlockSize;
/**
* Size of small blocks. This is usually 64.
* @var int number of octets per block
*/
public $smallBlockSize;
/**
* Reads an OLE container from the contents of the file given.
*
* @acces public
* @param string $file
* @return mixed true on success, PEAR_Error on failure
*/
public function read($file)
{
$fh = fopen($file, "r");
if (!$fh) {
throw new Exception("Can't open file $file");
}
$this->_file_handle = $fh;
$signature = fread($fh, 8);
if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) {
throw new Exception("File doesn't seem to be an OLE container.");
}
fseek($fh, 28);
if (fread($fh, 2) != "\xFE\xFF") {
// This shouldn't be a problem in practice
throw new Exception("Only Little-Endian encoding is supported.");
}
// Size of blocks and short blocks in bytes
$this->bigBlockSize = pow(2, self::_readInt2($fh));
$this->smallBlockSize = pow(2, self::_readInt2($fh));
// Skip UID, revision number and version number
fseek($fh, 44);
// Number of blocks in Big Block Allocation Table
$bbatBlockCount = self::_readInt4($fh);
// Root chain 1st block
$directoryFirstBlockId = self::_readInt4($fh);
// Skip unused bytes
fseek($fh, 56);
// Streams shorter than this are stored using small blocks
$this->bigBlockThreshold = self::_readInt4($fh);
// Block id of first sector in Short Block Allocation Table
$sbatFirstBlockId = self::_readInt4($fh);
// Number of blocks in Short Block Allocation Table
$sbbatBlockCount = self::_readInt4($fh);
// Block id of first sector in Master Block Allocation Table
$mbatFirstBlockId = self::_readInt4($fh);
// Number of blocks in Master Block Allocation Table
$mbbatBlockCount = self::_readInt4($fh);
$this->bbat = array();
// Remaining 4 * 109 bytes of current block is beginning of Master
// Block Allocation Table
$mbatBlocks = array();
for ($i = 0; $i < 109; ++$i) {
$mbatBlocks[] = self::_readInt4($fh);
}
// Read rest of Master Block Allocation Table (if any is left)
$pos = $this->_getBlockOffset($mbatFirstBlockId);
for ($i = 0; $i < $mbbatBlockCount; ++$i) {
fseek($fh, $pos);
for ($j = 0; $j < $this->bigBlockSize / 4 - 1; ++$j) {
$mbatBlocks[] = self::_readInt4($fh);
}
// Last block id in each block points to next block
$pos = $this->_getBlockOffset(self::_readInt4($fh));
}
// Read Big Block Allocation Table according to chain specified by
// $mbatBlocks
for ($i = 0; $i < $bbatBlockCount; ++$i) {
$pos = $this->_getBlockOffset($mbatBlocks[$i]);
fseek($fh, $pos);
for ($j = 0 ; $j < $this->bigBlockSize / 4; ++$j) {
$this->bbat[] = self::_readInt4($fh);
}
}
// Read short block allocation table (SBAT)
$this->sbat = array();
$shortBlockCount = $sbbatBlockCount * $this->bigBlockSize / 4;
$sbatFh = $this->getStream($sbatFirstBlockId);
for ($blockId = 0; $blockId < $shortBlockCount; ++$blockId) {
$this->sbat[$blockId] = self::_readInt4($sbatFh);
}
fclose($sbatFh);
$this->_readPpsWks($directoryFirstBlockId);
return true;
}
/**
* @param int block id
* @param int byte offset from beginning of file
* @access public
*/
public function _getBlockOffset($blockId)
{
return 512 + $blockId * $this->bigBlockSize;
}
/**
* Returns a stream for use with fread() etc. External callers should
* use PHPExcel_Shared_OLE_PPS_File::getStream().
* @param int|PPS block id or PPS
* @return resource read-only stream
*/
public function getStream($blockIdOrPps)
{
static $isRegistered = false;
if (!$isRegistered) {
stream_wrapper_register('ole-chainedblockstream',
'PHPExcel_Shared_OLE_ChainedBlockStream');
$isRegistered = true;
}
// Store current instance in global array, so that it can be accessed
// in OLE_ChainedBlockStream::stream_open().
// Object is removed from self::$instances in OLE_Stream::close().
$GLOBALS['_OLE_INSTANCES'][] = $this;
$instanceId = end(array_keys($GLOBALS['_OLE_INSTANCES']));
$path = 'ole-chainedblockstream://oleInstanceId=' . $instanceId;
if ($blockIdOrPps instanceof PHPExcel_Shared_OLE_PPS) {
$path .= '&blockId=' . $blockIdOrPps->_StartBlock;
$path .= '&size=' . $blockIdOrPps->Size;
} else {
$path .= '&blockId=' . $blockIdOrPps;
}
return fopen($path, 'r');
}
/**
* Reads a signed char.
* @param resource file handle
* @return int
* @access public
*/
private static function _readInt1($fh)
{
list(, $tmp) = unpack("c", fread($fh, 1));
return $tmp;
}
/**
* Reads an unsigned short (2 octets).
* @param resource file handle
* @return int
* @access public
*/
private static function _readInt2($fh)
{
list(, $tmp) = unpack("v", fread($fh, 2));
return $tmp;
}
/**
* Reads an unsigned long (4 octets).
* @param resource file handle
* @return int
* @access public
*/
private static function _readInt4($fh)
{
list(, $tmp) = unpack("V", fread($fh, 4));
return $tmp;
}
/**
* Gets information about all PPS's on the OLE container from the PPS WK's
* creates an OLE_PPS object for each one.
*
* @access public
* @param integer the block id of the first block
* @return mixed true on success, PEAR_Error on failure
*/
public function _readPpsWks($blockId)
{
$fh = $this->getStream($blockId);
for ($pos = 0; ; $pos += 128) {
fseek($fh, $pos, SEEK_SET);
$nameUtf16 = fread($fh, 64);
$nameLength = self::_readInt2($fh);
$nameUtf16 = substr($nameUtf16, 0, $nameLength - 2);
// Simple conversion from UTF-16LE to ISO-8859-1
$name = str_replace("\x00", "", $nameUtf16);
$type = self::_readInt1($fh);
switch ($type) {
case self::OLE_PPS_TYPE_ROOT:
$pps = new PHPExcel_Shared_OLE_PPS_Root(null, null, array());
$this->root = $pps;
break;
case self::OLE_PPS_TYPE_DIR:
$pps = new PHPExcel_Shared_OLE_PPS(null, null, null, null, null,
null, null, null, null, array());
break;
case self::OLE_PPS_TYPE_FILE:
$pps = new PHPExcel_Shared_OLE_PPS_File($name);
break;
default:
continue;
}
fseek($fh, 1, SEEK_CUR);
$pps->Type = $type;
$pps->Name = $name;
$pps->PrevPps = self::_readInt4($fh);
$pps->NextPps = self::_readInt4($fh);
$pps->DirPps = self::_readInt4($fh);
fseek($fh, 20, SEEK_CUR);
$pps->Time1st = self::OLE2LocalDate(fread($fh, 8));
$pps->Time2nd = self::OLE2LocalDate(fread($fh, 8));
$pps->_StartBlock = self::_readInt4($fh);
$pps->Size = self::_readInt4($fh);
$pps->No = count($this->_list);
$this->_list[] = $pps;
// check if the PPS tree (starting from root) is complete
if (isset($this->root) &&
$this->_ppsTreeComplete($this->root->No)) {
break;
}
}
fclose($fh);
// Initialize $pps->children on directories
foreach ($this->_list as $pps) {
if ($pps->Type == self::OLE_PPS_TYPE_DIR || $pps->Type == self::OLE_PPS_TYPE_ROOT) {
$nos = array($pps->DirPps);
$pps->children = array();
while ($nos) {
$no = array_pop($nos);
if ($no != -1) {
$childPps = $this->_list[$no];
$nos[] = $childPps->PrevPps;
$nos[] = $childPps->NextPps;
$pps->children[] = $childPps;
}
}
}
}
return true;
}
/**
* It checks whether the PPS tree is complete (all PPS's read)
* starting with the given PPS (not necessarily root)
*
* @access public
* @param integer $index The index of the PPS from which we are checking
* @return boolean Whether the PPS tree for the given PPS is complete
*/
public function _ppsTreeComplete($index)
{
return isset($this->_list[$index]) &&
($pps = $this->_list[$index]) &&
($pps->PrevPps == -1 ||
$this->_ppsTreeComplete($pps->PrevPps)) &&
($pps->NextPps == -1 ||
$this->_ppsTreeComplete($pps->NextPps)) &&
($pps->DirPps == -1 ||
$this->_ppsTreeComplete($pps->DirPps));
}
/**
* Checks whether a PPS is a File PPS or not.
* If there is no PPS for the index given, it will return false.
*
* @access public
* @param integer $index The index for the PPS
* @return bool true if it's a File PPS, false otherwise
*/
public function isFile($index)
{
if (isset($this->_list[$index])) {
return ($this->_list[$index]->Type == self::OLE_PPS_TYPE_FILE);
}
return false;
}
/**
* Checks whether a PPS is a Root PPS or not.
* If there is no PPS for the index given, it will return false.
*
* @access public
* @param integer $index The index for the PPS.
* @return bool true if it's a Root PPS, false otherwise
*/
public function isRoot($index)
{
if (isset($this->_list[$index])) {
return ($this->_list[$index]->Type == self::OLE_PPS_TYPE_ROOT);
}
return false;
}
/**
* Gives the total number of PPS's found in the OLE container.
*
* @access public
* @return integer The total number of PPS's found in the OLE container
*/
public function ppsTotal()
{
return count($this->_list);
}
/**
* Gets data from a PPS
* If there is no PPS for the index given, it will return an empty string.
*
* @access public
* @param integer $index The index for the PPS
* @param integer $position The position from which to start reading
* (relative to the PPS)
* @param integer $length The amount of bytes to read (at most)
* @return string The binary string containing the data requested
* @see OLE_PPS_File::getStream()
*/
public function getData($index, $position, $length)
{
// if position is not valid return empty string
if (!isset($this->_list[$index]) || ($position >= $this->_list[$index]->Size) || ($position < 0)) {
return '';
}
$fh = $this->getStream($this->_list[$index]);
$data = stream_get_contents($fh, $length, $position);
fclose($fh);
return $data;
}
/**
* Gets the data length from a PPS
* If there is no PPS for the index given, it will return 0.
*
* @access public
* @param integer $index The index for the PPS
* @return integer The amount of bytes in data the PPS has
*/
public function getDataLength($index)
{
if (isset($this->_list[$index])) {
return $this->_list[$index]->Size;
}
return 0;
}
/**
* Utility function to transform ASCII text to Unicode
*
* @access public
* @static
* @param string $ascii The ASCII string to transform
* @return string The string in Unicode
*/
public static function Asc2Ucs($ascii)
{
$rawname = '';
for ($i = 0; $i < strlen($ascii); ++$i) {
$rawname .= $ascii{$i} . "\x00";
}
return $rawname;
}
/**
* Utility function
* Returns a string for the OLE container with the date given
*
* @access public
* @static
* @param integer $date A timestamp
* @return string The string for the OLE container
*/
public static function LocalDate2OLE($date = null)
{
if (!isset($date)) {
return "\x00\x00\x00\x00\x00\x00\x00\x00";
}
// factor used for separating numbers into 4 bytes parts
$factor = pow(2, 32);
// days from 1-1-1601 until the beggining of UNIX era
$days = 134774;
// calculate seconds
$big_date = $days*24*3600 + gmmktime(date("H",$date),date("i",$date),date("s",$date),
date("m",$date),date("d",$date),date("Y",$date));
// multiply just to make MS happy
$big_date *= 10000000;
$high_part = floor($big_date / $factor);
// lower 4 bytes
$low_part = floor((($big_date / $factor) - $high_part) * $factor);
// Make HEX string
$res = '';
for ($i = 0; $i < 4; ++$i) {
$hex = $low_part % 0x100;
$res .= pack('c', $hex);
$low_part /= 0x100;
}
for ($i = 0; $i < 4; ++$i) {
$hex = $high_part % 0x100;
$res .= pack('c', $hex);
$high_part /= 0x100;
}
return $res;
}
/**
* Returns a timestamp from an OLE container's date
*
* @access public
* @static
* @param integer $string A binary string with the encoded date
* @return string The timestamp corresponding to the string
*/
public static function OLE2LocalDate($string)
{
if (strlen($string) != 8) {
return new PEAR_Error("Expecting 8 byte string");
}
// factor used for separating numbers into 4 bytes parts
$factor = pow(2,32);
list(, $high_part) = unpack('V', substr($string, 4, 4));
list(, $low_part) = unpack('V', substr($string, 0, 4));
$big_date = ($high_part * $factor) + $low_part;
// translate to seconds
$big_date /= 10000000;
// days from 1-1-1601 until the beggining of UNIX era
$days = 134774;
// translate to seconds from beggining of UNIX era
$big_date -= $days * 24 * 3600;
return floor($big_date);
}
}

Source for file OLE.php