<?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 1.7 2003/08/21 15:15:40 xnoguer 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');
require_once dirname ( __FILE__ ) . '/PPS.php';
/**
* OLE package base class.
*
* @author Xavier Noguer <xnoguer@php.net>
* @category Structures
* @package OLE
*/
class OLE
{
/**
* 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 $_list;
/**
* Creates a new OLE object
* Remember to use ampersand when creating an OLE object ($my_ole =& new OLE();)
* @access public
*/
function OLE()
{
$this->_list = array();
}
/**
* Reads an OLE container from the contents of the file given.
*
* @acces public
* @param string $file
* @return mixed true on success, PEAR_Error on failure
*/
function read($file)
{
/* consider storing offsets as constants */
$big_block_size_offset = 30;
$iBdbCnt_offset = 44;
$bd_start_offset = 68;
$fh = @fopen($file, "r");
if ($fh == false) {
return $this->raiseError("Can't open file $file");
}
$this->_file_handle = $fh;
/* begin reading OLE attributes */
fseek($fh, 0);
$signature = fread($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, $big_block_size_offset);
$packed_array = unpack("v", fread($fh, 2));
$big_block_size = pow(2, $packed_array['']);
$packed_array = unpack("v", fread($fh, 2));
$small_block_size = pow(2, $packed_array['']);
$i1stBdL = ($big_block_size - 0x4C) / OLE_LONG_INT_SIZE;
fseek($fh, $iBdbCnt_offset);
$packed_array = unpack("V", fread($fh, 4));
$iBdbCnt = $packed_array[''];
$packed_array = unpack("V", fread($fh, 4));
$pps_wk_start = $packed_array[''];
fseek($fh, $bd_start_offset);
$packed_array = unpack("V", fread($fh, 4));
$bd_start = $packed_array[''];
$packed_array = unpack("V", fread($fh, 4));
$bd_count = $packed_array[''];
$packed_array = unpack("V", fread($fh, 4));
$iAll = $packed_array['']; // this may be wrong
/* create OLE_PPS objects from */
$ret = $this->_readPpsWks($pps_wk_start, $big_block_size);
if (PEAR::isError($ret)) {
return $ret;
}
return true;
}
/**
* Destructor (using PEAR)
* Just closes the file handle on the OLE file.
*
* @access private
*/
function _OLE()
{
fclose($this->_file_handle);
}
/**
* 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 $pps_wk_start Position inside the OLE file where PPS WK's start
* @param integer $big_block_size Size of big blobks in the OLE file
* @return mixed true on success, PEAR_Error on failure
*/
function _readPpsWks($pps_wk_start, $big_block_size)
{
$pointer = ($pps_wk_start + 1) * $big_block_size;
while (1)
{
fseek($this->_file_handle, $pointer);
$pps_wk = fread($this->_file_handle, OLE_PPS_SIZE);
if (strlen($pps_wk) != OLE_PPS_SIZE) {
break; // Excel likes to add a trailing byte sometimes
//return $this->raiseError("PPS at $pointer seems too short: ".strlen($pps_wk));
}
$name_length = unpack("c", substr($pps_wk, 64, 2)); // FIXME (2 bytes??)
$name_length = $name_length[''] - 2;
$name = substr($pps_wk, 0, $name_length);
$type = unpack("c", substr($pps_wk, 66, 1));
if (($type[''] != OLE_PPS_TYPE_ROOT) and
($type[''] != OLE_PPS_TYPE_DIR) and
($type[''] != OLE_PPS_TYPE_FILE))
{
return $this->raiseError("PPS at $pointer has unknown type: {$type['']}");
}
$prev = unpack("V", substr($pps_wk, 68, 4));
$next = unpack("V", substr($pps_wk, 72, 4));
$dir = unpack("V", substr($pps_wk, 76, 4));
// there is no magic number, it can take different values.
//$magic = unpack("V", strrev(substr($pps_wk, 92, 4)));
$time_1st = substr($pps_wk, 100, 8);
$time_2nd = substr($pps_wk, 108, 8);
$start_block = unpack("V", substr($pps_wk, 116, 4));
$size = unpack("V", substr($pps_wk, 120, 4));
// _data member will point to position in file!!
// OLE_PPS object is created with an empty children array!!
$this->_list[] = new OLE_PPS(null, '', $type[''], $prev[''], $next[''],
$dir[''], OLE::OLE2LocalDate($time_1st),
OLE::OLE2LocalDate($time_2nd),
($start_block[''] + 1) * $big_block_size, array());
// give it a size
$this->_list[count($this->_list) - 1]->Size = $size[''];
// check if the PPS tree (starting from root) is complete
if ($this->_ppsTreeComplete(0)) {
break;
}
$pointer += OLE_PPS_SIZE;
}
}
/**
* 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)
{
if ($this->_list[$index]->NextPps != -1) {
if (!isset($this->_list[$this->_list[$index]->NextPps])) {
return false;
}
else {
return $this->_ppsTreeComplete($this->_list[$index]->NextPps);
}
}
if ($this->_list[$index]->DirPps != -1) {
if (!isset($this->_list[$this->_list[$index]->DirPps])) {
return false;
}
else {
return $this->_ppsTreeComplete($this->_list[$index]->DirPps);
}
}
return true;
}
/**
* 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 $index The index for the PPS
* @return bool true if it's a File PPS, false otherwise
*/
function isFile($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.
*
* @access public
* @param integer $index The index for the PPS.
* @return bool true if it's a Root PPS, false otherwise
*/
function isRoot($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.
*
* @access public
* @return integer The total number of PPS's found in the OLE container
*/
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 $length The amount of bytes to read (at most)
* @return string The binary string containing the data requested
*/
function getData($index, $position, $length)
{
// if position is not valid return empty string
if (!isset($this->_list[$index]) or ($position >= $this->_list[$index]->Size) or ($position < 0)) {
return '';
}
// Beware!!! _data member is actually a position
fseek($this->_file_handle, $this->_list[$index]->_data + $position);
return fread($this->_file_handle, $length);
}
/**
* Gets the data length from a PPS
* If there is no PPS for the index given, it will return 0.
*
* @access public
* @param integer $index The index for the PPS
* @return integer The amount of bytes in data the PPS has
*/
function getDataLength($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
*
* @access public
* @static
* @param integer $string A binary string with the encoded date
* @return string The timestamp corresponding to the string
*/
function OLE2LocalDate($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++)
{
$al = unpack('C', $string{(7 - $i)});
$high_part += $al[''];
if ($i < 3) {
$high_part *= 0x100;
}
}
$low_part = 0;
for ($i=4; $i<8; $i++)
{
$al = unpack('C', $string{(7 - $i)});
$low_part += $al[''];
if ($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);
}
}
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