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 1.15 2007/12/18 20:59:11 schmidt Exp $
/**
* Constants for OLE package
*/
define('OLE_PPS_TYPE_ROOT', 5);
define('OLE_PPS_TYPE_DIR', 1);
define('OLE_PPS_TYPE_FILE', 2);
define('OLE_DATA_SIZE_SMALL', 0x1000);
define('OLE_LONG_INT_SIZE', 4);
define('OLE_PPS_SIZE', 0x80);
require_once 'PEAR.php';
/**
* Array for storing OLE instances that are accessed from
* OLE_ChainedBlockStream::stream_open().
* @var array
*/
$GLOBALS['_OLE_INSTANCES'] = array();
/**
* OLE package base class.
*
* @category Structures
* @package OLE
* @author Xavier Noguer <xnoguer@php.net>
* @author Christian Schmidt <schmidt@php.net>
*/
class OLE extends PEAR
{
/**
* The file handle for reading an OLE container
* @var resource
*/
var $_file_handle;
/**
* Array of PPS's found on the OLE container
* @var array
*/
var $_list;
/**
* Root directory of OLE container
* @var OLE_PPS_Root
*/
var $root;
/**
* Big Block Allocation Table
* @var array (blockId => nextBlockId)
*/
var $bbat;
/**
* Short Block Allocation Table
* @var array (blockId => nextBlockId)
*/
var $sbat;
/**
* Size of big blocks. This is usually 512.
* @var int number of octets per block.
*/
var $bigBlockSize;
/**
* Size of small blocks. This is usually 64.
* @var int number of octets per block
*/
var $smallBlockSize;
/**
* Creates a new OLE object
* @access public
*/
function OLE()
{
$this->_list = array();
}
/**
* Destructor (using PEAR)
* Just closes the file handle on the OLE file.
*
* @access private
*/
function _OLE()
{
fclose($this->_file_handle);
}
/**
* Reads an OLE container from the contents of the file given.
*
* @access public
* @param string $file
* @return mixed true on success, PEAR_Error on failure
*/
function read($file)
{
$fh = @fopen($file, "r");
if (!$fh) {
return $this->raiseError("Can't open file $file");
}
$this->_file_handle = $fh;
$signature = fread($fh, 8);
if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) {
return $this->raiseError("File doesn't seem to be an OLE container.");
}
fseek($fh, 28);
if (fread($fh, 2) != "\xFE\xFF") {
// This shouldn't be a problem in practice
return $this->raiseError("Only Little-Endian encoding is supported.");
}
// Size of blocks and short blocks in bytes
$this->bigBlockSize = pow(2, $this->_readInt2($fh));
$this->smallBlockSize = pow(2, $this->_readInt2($fh));
// Skip UID, revision number and version number
fseek($fh, 44);
// Number of blocks in Big Block Allocation Table
$bbatBlockCount = $this->_readInt4($fh);
// Root chain 1st block
$directoryFirstBlockId = $this->_readInt4($fh);
// Skip unused bytes
fseek($fh, 56);
// Streams shorter than this are stored using small blocks
$this->bigBlockThreshold = $this->_readInt4($fh);
// Block id of first sector in Short Block Allocation Table
$sbatFirstBlockId = $this->_readInt4($fh);
// Number of blocks in Short Block Allocation Table
$sbbatBlockCount = $this->_readInt4($fh);
// Block id of first sector in Master Block Allocation Table
$mbatFirstBlockId = $this->_readInt4($fh);
// Number of blocks in Master Block Allocation Table
$mbbatBlockCount = $this->_readInt4($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[] = $this->_readInt4($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[] = $this->_readInt4($fh);
}
// Last block id in each block points to next block
$pos = $this->_getBlockOffset($this->_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[] = $this->_readInt4($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] = $this->_readInt4($sbatFh);
}
fclose($sbatFh);
$this->_readPpsWks($directoryFirstBlockId);
return true;
}
/**
* @param int $blockId block id
* @return int byte offset from beginning of file
* @access private
*/
function _getBlockOffset($blockId)
{
return 512 + $blockId * $this->bigBlockSize;
}
/**
* Returns a stream for use with fread() etc. External callers should
* use OLE_PPS_File::getStream().
* @param int|PPS$blockIdOrPps block id or PPS
* @return resource read-only stream
*/
function getStream($blockIdOrPps)
{
include_once 'OLE/ChainedBlockStream.php';
static $isRegistered = false;
if (!$isRegistered) {
stream_wrapper_register('ole-chainedblockstream',
'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=' . $instanceId;
if (is_a($blockIdOrPps, 'OLE_PPS')) {
$path .= '&blockId=' . $blockIdOrPps->_StartBlock;
$path .= '&size=' . $blockIdOrPps->Size;
} else {
$path .= '&blockId=' . $blockIdOrPps;
}
return fopen($path, 'r');
}
/**
* Reads a signed char.
* @param resource $fh file handle
* @return int
* @access private
*/
function _readInt1($fh)
{
list(, $tmp) = unpack("c", fread($fh, 1));
return $tmp;
}
/**
* Reads an unsigned short (2 octets).
* @param resource $fh file handle
* @return int
* @access private
*/
function _readInt2($fh)
{
list(, $tmp) = unpack("v", fread($fh, 2));
return $tmp;
}
/**
* Reads an unsigned long (4 octets).
* @param resource file handle
* @return int
* @access private
*/
function _readInt4($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 private
* @param integer $blockId the block id of the first block
* @return mixed true on success, PEAR_Error on failure
*/
function _readPpsWks($blockId)
{
$fh = $this->getStream($blockId);
for ($pos = 0; ; $pos += 128) {
fseek($fh, $pos, SEEK_SET);
$nameUtf16 = fread($fh, 64);
$nameLength = $this->_readInt2($fh);
$nameUtf16 = substr($nameUtf16, 0, $nameLength - 2);
// Simple conversion from UTF-16LE to ISO-8859-1
$name = str_replace("\x00", "", $nameUtf16);
$type = $this->_readInt1($fh);
switch ($type) {
case OLE_PPS_TYPE_ROOT:
require_once 'OLE/PPS/Root.php';
$pps = new OLE_PPS_Root(null, null, array());
$this->root = $pps;
break;
case OLE_PPS_TYPE_DIR:
$pps = new OLE_PPS(null, null, null, null, null,
null, null, null, null, array());
break;
case OLE_PPS_TYPE_FILE:
require_once 'OLE/PPS/File.php';
$pps = new OLE_PPS_File($name);
break;
default:
continue;
}
fseek($fh, 1, SEEK_CUR);
$pps->Type = $type;
$pps->Name = $name;
$pps->PrevPps = $this->_readInt4($fh);
$pps->NextPps = $this->_readInt4($fh);
$pps->DirPps = $this->_readInt4($fh);
fseek($fh, 20, SEEK_CUR);
$pps->Time1st = OLE::OLE2LocalDate(fread($fh, 8));
$pps->Time2nd = OLE::OLE2LocalDate(fread($fh, 8));
$pps->_StartBlock = $this->_readInt4($fh);
$pps->Size = $this->_readInt4($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 == OLE_PPS_TYPE_DIR || $pps->Type == 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 private
* @param integer $index The index of the PPS from which we are checking
* @return boolean Whether the PPS tree for the given PPS is complete
*/
function _ppsTreeComplete($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.
* @param integer $index The index for the PPS
* @return bool true if it's a File PPS, false otherwise
* @access public
*/
function isFile($index)
{
if (isset($this->_list[$index])) {
return ($this->_list[$index]->Type == 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.
* @param integer $index The index for the PPS.
* @return bool true if it's a Root PPS, false otherwise
* @access public
*/
function isRoot($index)
{
if (isset($this->_list[$index])) {
return ($this->_list[$index]->Type == OLE_PPS_TYPE_ROOT);
}
return false;
}
/**
* Gives the total number of PPS's found in the OLE container.
* @return integer The total number of PPS's found in the OLE container
* @access 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.
* @param integer $index The index for the PPS
* @param integer $position The position from which to start reading
* (relative to the PPS)
* @param integer $length The amount of bytes to read (at most)
* @return string The binary string containing the data requested
* @access public
* @see OLE_PPS_File::getStream()
*/
function getData($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.
* @param integer $index The index for the PPS
* @return integer The amount of bytes in data the PPS has
* @access public
*/
function getDataLength($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 $ascii The ASCII string to transform
* @return string The string in Unicode
*/
function Asc2Ucs($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 $date A timestamp
* @return string The string for the OLE container
*/
function LocalDate2OLE($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
* @param integer $string A binary string with the encoded date
* @return string The timestamp corresponding to the string
* @access public
* @static
*/
function OLE2LocalDate($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);
$high_part = 0;
for ($i = 0; $i < 4; $i++) {
list(, $high_part) = unpack('C', $string{(7 - $i)});
if ($i < 3) {
$high_part *= 0x100;
}
}
$low_part = 0;
for ($i = 4; $i < 8; $i++) {
list(, $low_part) = unpack('C', $string{(7 - $i)});
if ($i < 7) {
$low_part *= 0x100;
}
}
$big_date = ($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