vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/OLERead.php

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<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 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 - 2014 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							= 0x42;
	const START_BLOCK_POS					= 0x74;