当前路径：Classes/PHPExcel/Shared/OLERead.php
<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Shared
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */

defined('IDENTIFIER_OLE') ||
    define('IDENTIFIER_OLE', pack('CCCCCCCC', 0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1));

class PHPExcel_Shared_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 ...