411 Zeilen
13 KiB
PHP
411 Zeilen
13 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4: */
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// +----------------------------------------------------------------------+
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// | PHP Version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2002 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Author: Xavier Noguer <xnoguer@php.net> |
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// | Based on OLE::Storage_Lite by Kawai, Takanori |
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// +----------------------------------------------------------------------+
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//
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// $Id$
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/**
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* Constants for OLE package
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*/
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define('OLE_PPS_TYPE_ROOT', 5);
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define('OLE_PPS_TYPE_DIR', 1);
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define('OLE_PPS_TYPE_FILE', 2);
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define('OLE_DATA_SIZE_SMALL', 0x1000);
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define('OLE_LONG_INT_SIZE', 4);
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define('OLE_PPS_SIZE', 0x80);
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require_once('PEAR.php');
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require_once 'OLE/PPS.php';
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/**
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* OLE package base class.
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*
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* @author Xavier Noguer <xnoguer@php.net>
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* @category Structures
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* @package OLE
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*/
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class OLE extends PEAR
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{
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/**
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* The file handle for reading an OLE container
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* @var resource
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*/
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var $_file_handle;
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/**
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* Array of PPS's found on the OLE container
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* @var array
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*/
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var $_list;
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/**
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* Creates a new OLE object
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* Remember to use ampersand when creating an OLE object ($my_ole =& new OLE();)
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* @access public
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*/
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function OLE()
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{
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$this->_list = array();
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}
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/**
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* Reads an OLE container from the contents of the file given.
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*
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* @acces public
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* @param string $file
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* @return mixed true on success, PEAR_Error on failure
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*/
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function read($file)
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{
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/* consider storing offsets as constants */
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$big_block_size_offset = 30;
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$iBdbCnt_offset = 44;
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$bd_start_offset = 68;
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$fh = @fopen($file, "r");
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if ($fh == false) {
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return $this->raiseError("Can't open file $file");
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}
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$this->_file_handle = $fh;
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/* begin reading OLE attributes */
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fseek($fh, 0);
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$signature = fread($fh, 8);
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if ("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" != $signature) {
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return $this->raiseError("File doesn't seem to be an OLE container.");
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}
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fseek($fh, $big_block_size_offset);
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$packed_array = unpack("v", fread($fh, 2));
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$big_block_size = pow(2, $packed_array['']);
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$packed_array = unpack("v", fread($fh, 2));
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$small_block_size = pow(2, $packed_array['']);
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$i1stBdL = ($big_block_size - 0x4C) / OLE_LONG_INT_SIZE;
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fseek($fh, $iBdbCnt_offset);
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$packed_array = unpack("V", fread($fh, 4));
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$iBdbCnt = $packed_array[''];
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$packed_array = unpack("V", fread($fh, 4));
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$pps_wk_start = $packed_array[''];
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fseek($fh, $bd_start_offset);
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$packed_array = unpack("V", fread($fh, 4));
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$bd_start = $packed_array[''];
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$packed_array = unpack("V", fread($fh, 4));
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$bd_count = $packed_array[''];
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$packed_array = unpack("V", fread($fh, 4));
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$iAll = $packed_array['']; // this may be wrong
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/* create OLE_PPS objects from */
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$ret = $this->_readPpsWks($pps_wk_start, $big_block_size);
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if (PEAR::isError($ret)) {
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return $ret;
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}
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return true;
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}
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/**
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* Destructor (using PEAR)
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* Just closes the file handle on the OLE file.
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*
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* @access private
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*/
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function _OLE()
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{
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fclose($this->_file_handle);
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}
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/**
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* Gets information about all PPS's on the OLE container from the PPS WK's
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* creates an OLE_PPS object for each one.
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*
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* @access private
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* @param integer $pps_wk_start Position inside the OLE file where PPS WK's start
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* @param integer $big_block_size Size of big blobks in the OLE file
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* @return mixed true on success, PEAR_Error on failure
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*/
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function _readPpsWks($pps_wk_start, $big_block_size)
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{
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$pointer = ($pps_wk_start + 1) * $big_block_size;
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while (1)
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{
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fseek($this->_file_handle, $pointer);
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$pps_wk = fread($this->_file_handle, OLE_PPS_SIZE);
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if (strlen($pps_wk) != OLE_PPS_SIZE) {
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break; // Excel likes to add a trailing byte sometimes
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//return $this->raiseError("PPS at $pointer seems too short: ".strlen($pps_wk));
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}
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$name_length = unpack("c", substr($pps_wk, 64, 2)); // FIXME (2 bytes??)
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$name_length = $name_length[''] - 2;
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$name = substr($pps_wk, 0, $name_length);
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$type = unpack("c", substr($pps_wk, 66, 1));
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if (($type[''] != OLE_PPS_TYPE_ROOT) and
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($type[''] != OLE_PPS_TYPE_DIR) and
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($type[''] != OLE_PPS_TYPE_FILE))
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{
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return $this->raiseError("PPS at $pointer has unknown type: {$type['']}");
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}
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$prev = unpack("V", substr($pps_wk, 68, 4));
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$next = unpack("V", substr($pps_wk, 72, 4));
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$dir = unpack("V", substr($pps_wk, 76, 4));
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// there is no magic number, it can take different values.
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//$magic = unpack("V", strrev(substr($pps_wk, 92, 4)));
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$time_1st = substr($pps_wk, 100, 8);
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$time_2nd = substr($pps_wk, 108, 8);
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$start_block = unpack("V", substr($pps_wk, 116, 4));
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$size = unpack("V", substr($pps_wk, 120, 4));
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// _data member will point to position in file!!
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// OLE_PPS object is created with an empty children array!!
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$this->_list[] = new OLE_PPS(null, '', $type[''], $prev[''], $next[''],
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$dir[''], OLE::OLE2LocalDate($time_1st),
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OLE::OLE2LocalDate($time_2nd),
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($start_block[''] + 1) * $big_block_size, array());
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// give it a size
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$this->_list[count($this->_list) - 1]->Size = $size[''];
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// check if the PPS tree (starting from root) is complete
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if ($this->_ppsTreeComplete(0)) {
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break;
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}
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$pointer += OLE_PPS_SIZE;
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}
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}
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/**
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* It checks whether the PPS tree is complete (all PPS's read)
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* starting with the given PPS (not necessarily root)
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*
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* @access private
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* @param integer $index The index of the PPS from which we are checking
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* @return boolean Whether the PPS tree for the given PPS is complete
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*/
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function _ppsTreeComplete($index)
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{
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if ($this->_list[$index]->NextPps != -1) {
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if (!isset($this->_list[$this->_list[$index]->NextPps])) {
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return false;
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}
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else {
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return $this->_ppsTreeComplete($this->_list[$index]->NextPps);
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}
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}
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if ($this->_list[$index]->DirPps != -1) {
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if (!isset($this->_list[$this->_list[$index]->DirPps])) {
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return false;
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}
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else {
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return $this->_ppsTreeComplete($this->_list[$index]->DirPps);
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}
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}
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return true;
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}
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/**
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* Checks whether a PPS is a File PPS or not.
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* If there is no PPS for the index given, it will return false.
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*
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* @access public
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* @param integer $index The index for the PPS
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* @return bool true if it's a File PPS, false otherwise
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*/
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function isFile($index)
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{
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if (isset($this->_list[$index])) {
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return ($this->_list[$index]->Type == OLE_PPS_TYPE_FILE);
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}
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return false;
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}
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/**
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* Checks whether a PPS is a Root PPS or not.
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* If there is no PPS for the index given, it will return false.
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*
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* @access public
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* @param integer $index The index for the PPS.
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* @return bool true if it's a Root PPS, false otherwise
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*/
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function isRoot($index)
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{
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if (isset($this->_list[$index])) {
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return ($this->_list[$index]->Type == OLE_PPS_TYPE_ROOT);
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}
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return false;
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}
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/**
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* Gives the total number of PPS's found in the OLE container.
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*
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* @access public
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* @return integer The total number of PPS's found in the OLE container
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*/
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function ppsTotal()
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{
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return count($this->_list);
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}
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/**
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* Gets data from a PPS
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* If there is no PPS for the index given, it will return an empty string.
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*
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* @access public
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* @param integer $index The index for the PPS
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* @param integer $position The position from which to start reading
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* (relative to the PPS)
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* @param integer $length The amount of bytes to read (at most)
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* @return string The binary string containing the data requested
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*/
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function getData($index, $position, $length)
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{
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// if position is not valid return empty string
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if (!isset($this->_list[$index]) or ($position >= $this->_list[$index]->Size) or ($position < 0)) {
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return '';
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}
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// Beware!!! _data member is actually a position
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fseek($this->_file_handle, $this->_list[$index]->_data + $position);
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return fread($this->_file_handle, $length);
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}
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/**
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* Gets the data length from a PPS
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* If there is no PPS for the index given, it will return 0.
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*
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* @access public
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* @param integer $index The index for the PPS
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* @return integer The amount of bytes in data the PPS has
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*/
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function getDataLength($index)
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{
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if (isset($this->_list[$index])) {
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return $this->_list[$index]->Size;
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}
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return 0;
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}
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/**
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* Utility function to transform ASCII text to Unicode
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*
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* @access public
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* @static
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* @param string $ascii The ASCII string to transform
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* @return string The string in Unicode
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*/
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function Asc2Ucs($ascii)
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{
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$rawname = '';
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for ($i = 0; $i < strlen($ascii); $i++) {
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$rawname .= $ascii{$i}."\x00";
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}
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return $rawname;
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}
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/**
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* Utility function
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* Returns a string for the OLE container with the date given
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*
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* @access public
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* @static
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* @param integer $date A timestamp
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* @return string The string for the OLE container
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*/
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function LocalDate2OLE($date = null)
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{
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if (!isset($date)) {
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return "\x00\x00\x00\x00\x00\x00\x00\x00";
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}
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// factor used for separating numbers into 4 bytes parts
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$factor = pow(2,32);
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// days from 1-1-1601 until the beggining of UNIX era
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$days = 134774;
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// calculate seconds
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$big_date = $days*24*3600 + gmmktime(date("H",$date),date("i",$date),date("s",$date),
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date("m",$date),date("d",$date),date("Y",$date));
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// multiply just to make MS happy
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$big_date *= 10000000;
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$high_part = floor($big_date/$factor);
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// lower 4 bytes
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$low_part = floor((($big_date/$factor) - $high_part)*$factor);
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// Make HEX string
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$res = '';
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for ($i=0; $i<4; $i++)
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{
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$hex = $low_part % 0x100;
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$res .= pack('c', $hex);
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$low_part /= 0x100;
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}
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for ($i=0; $i<4; $i++)
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{
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$hex = $high_part % 0x100;
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$res .= pack('c', $hex);
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$high_part /= 0x100;
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}
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return $res;
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}
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/**
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* Returns a timestamp from an OLE container's date
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*
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* @access public
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* @static
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* @param integer $string A binary string with the encoded date
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* @return string The timestamp corresponding to the string
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*/
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function OLE2LocalDate($string)
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{
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if (strlen($string) != 8) {
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return new PEAR_Error("Expecting 8 byte string");
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}
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// factor used for separating numbers into 4 bytes parts
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$factor = pow(2,32);
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$high_part = 0;
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for ($i=0; $i<4; $i++)
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{
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$al = unpack('C', $string{(7 - $i)});
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$high_part += $al[''];
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if ($i < 3) {
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$high_part *= 0x100;
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}
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}
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$low_part = 0;
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for ($i=4; $i<8; $i++)
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{
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$al = unpack('C', $string{(7 - $i)});
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$low_part += $al[''];
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if ($i < 7) {
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$low_part *= 0x100;
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}
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}
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$big_date = ($high_part*$factor) + $low_part;
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// translate to seconds
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$big_date /= 10000000;
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// days from 1-1-1601 until the beggining of UNIX era
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$days = 134774;
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// translate to seconds from beggining of UNIX era
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$big_date -= $days*24*3600;
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return floor($big_date);
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}
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}
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?>
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