PHPExcel_Writer_Excel5

# Source for file BIFFwriter.php Documentation is available at BIFFwriter.php <?php /** * PHPExcel * * Copyright (c) 2006 - 2011 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_Writer_Excel5 * @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version 1.7.6, 2011-02-27 */ // Original file header of PEAR::Spreadsheet_Excel_Writer_BIFFwriter (used as the base for this class): // ----------------------------------------------------------------------------------------- // * Module written/ported by Xavier Noguer <xnoguer@rezebra.com> // * // * The majority of this is _NOT_ my code. I simply ported it from the // * PERL Spreadsheet::WriteExcel module. // * // * The author of the Spreadsheet::WriteExcel module is John McNamara // * <jmcnamara@cpan.org> // * // * I _DO_ maintain this code, and John McNamara has nothing to do with the // * porting of this code to PHP. Any questions directly related to this // * class library should be directed to me. // * // * License Information: // * // * Spreadsheet_Excel_Writer: A library for generating Excel Spreadsheets // * Copyright (c) 2002-2003 Xavier Noguer xnoguer@rezebra.com // * // * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // */ /** * PHPExcel_Writer_Excel5_BIFFwriter * * @category PHPExcel * @package PHPExcel_Writer_Excel5 * @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel) */ class PHPExcel_Writer_Excel5_BIFFwriter { /** * The BIFF/Excel version (5). * @var integer */ public $_BIFF_version = 0x0500; /** * The byte order of this architecture. 0 => little endian, 1 => big endian * @var integer */ private static $_byte_order; /** * The string containing the data of the BIFF stream * @var string */ public $_data; /** * The size of the data in bytes. Should be the same as strlen($this->_data) * @var integer */ public $_datasize; /** * The maximum length for a BIFF record (excluding record header and length field). See _addContinue() * @var integer * @see _addContinue() */ public $_limit; /** * Constructor */ public function __construct() { $this->_data = ''; $this->_datasize = 0; $this->_limit = 2080; } /** * Determine the byte order and store it as class data to avoid * recalculating it for each call to new(). * * @return int */ public static function getByteOrder() { if (!isset(self::$_byte_order)) { // Check if "pack" gives the required IEEE 64bit float $teststr = pack("d", 1.2345); $number = pack("C8", 0x8D, 0x97, 0x6E, 0x12, 0x83, 0xC0, 0xF3, 0x3F); if ($number == $teststr) { $byte_order = 0; // Little Endian } elseif ($number == strrev($teststr)){ $byte_order = 1; // Big Endian } else { // Give up. I'll fix this in a later version. throw new Exception("Required floating point format ". "not supported on this platform."); } self::$_byte_order = $byte_order; } return self::$_byte_order; } /** * General storage function * * @param string $data binary data to append * @access private */ function _append($data) { if (strlen($data) - 4 > $this->_limit) { $data = $this->_addContinue($data); } $this->_data .= $data; $this->_datasize += strlen($data); } /** * General storage function like _append, but returns string instead of modifying $this->_data * * @param string $data binary data to write * @return string */ public function writeData($data) { if (strlen($data) - 4 > $this->_limit) { $data = $this->_addContinue($data); } $this->_datasize += strlen($data); return $data; } /** * Writes Excel BOF record to indicate the beginning of a stream or * sub-stream in the BIFF file. * * @param integer $type Type of BIFF file to write: 0x0005 Workbook, * 0x0010 Worksheet. * @access private */ function _storeBof($type) { $record = 0x0809; // Record identifier // According to the SDK $build and $year should be set to zero. // However, this throws a warning in Excel 5. So, use magic numbers. if ($this->_BIFF_version == 0x0500) { $length = 0x0008; $unknown = ''; $build = 0x096C; $year = 0x07C9; } elseif ($this->_BIFF_version == 0x0600) { $length = 0x0010; // by inspection of real files, MS Office Excel 2007 writes the following $unknown = pack("VV", 0x000100D1, 0x00000406); $build = 0x0DBB; $year = 0x07CC; } $version = $this->_BIFF_version; $header = pack("vv", $record, $length); $data = pack("vvvv", $version, $type, $build, $year); $this->_append($header . $data . $unknown); } /** * Writes Excel EOF record to indicate the end of a BIFF stream. * * @access private */ function _storeEof() { $record = 0x000A; // Record identifier $length = 0x0000; // Number of bytes to follow $header = pack("vv", $record, $length); $this->_append($header); } /** * Writes Excel EOF record to indicate the end of a BIFF stream. * * @access private */ public function writeEof() { $record = 0x000A; // Record identifier $length = 0x0000; // Number of bytes to follow $header = pack("vv", $record, $length); return $this->writeData($header); } /** * Excel limits the size of BIFF records. In Excel 5 the limit is 2084 bytes. In * Excel 97 the limit is 8228 bytes. Records that are longer than these limits * must be split up into CONTINUE blocks. * * This function takes a long BIFF record and inserts CONTINUE records as * necessary. * * @param string $data The original binary data to be written * @return string A very convenient string of continue blocks * @access private */ function _addContinue($data) { $limit = $this->_limit; $record = 0x003C; // Record identifier // The first 2080/8224 bytes remain intact. However, we have to change // the length field of the record. $tmp = substr($data, 0, 2) . pack("v", $limit) . substr($data, 4, $limit); $header = pack("vv", $record, $limit); // Headers for continue records // Retrieve chunks of 2080/8224 bytes +4 for the header. $data_length = strlen($data); for ($i = $limit + 4; $i < ($data_length - $limit); $i += $limit) { $tmp .= $header; $tmp .= substr($data, $i, $limit); } // Retrieve the last chunk of data $header = pack("vv", $record, strlen($data) - $i); $tmp .= $header; $tmp .= substr($data, $i, strlen($data) - $i); return $tmp; } } Documentation generated on Sun, 27 Feb 2011 16:28:33 -0800 by phpDocumentor 1.4.3