class PHPExcel_Writer_Excel5_BIFFwriter in Loft Data Grids 7.2

PHPExcel_Writer_Excel5_BIFFwriter

@category PHPExcel @package PHPExcel_Writer_Excel5 @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)

Hierarchy

• class \PHPExcel_Writer_Excel5_BIFFwriter

File

vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel5/BIFFwriter.php, line 70

class PHPExcel_Writer_Excel5_BIFFwriter {

  /**
   * 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 = 8224;

  /**
   * Constructor
   */
  public function __construct() {
    $this->_data = '';
    $this->_datasize = 0;

    //		$this->_limit      = 8224;
  }

  /**
   * 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 PHPExcel_Writer_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 = 0x809;

    // Record identifier	(BIFF5-BIFF8)
    $length = 0x10;

    // by inspection of real files, MS Office Excel 2007 writes the following
    $unknown = pack("VV", 0x100d1, 0x406);
    $build = 0xdbb;

    //	Excel 97
    $year = 0x7cc;

    //	Excel 97
    $version = 0x600;

    //	BIFF8
    $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 = 0xa;

    // Record identifier
    $length = 0x0;

    // 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 = 0xa;

    // Record identifier
    $length = 0x0;

    // 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 = 0x3c;

    // 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;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
PHPExcel_Writer_Excel5_BIFFwriter::$_byte_order	private static	property	* The byte order of this architecture. 0 => little endian, 1 => big endian *
PHPExcel_Writer_Excel5_BIFFwriter::$_data	public	property	* The string containing the data of the BIFF stream *
PHPExcel_Writer_Excel5_BIFFwriter::$_datasize	public	property	* The size of the data in bytes. Should be the same as strlen($this->_data) *
PHPExcel_Writer_Excel5_BIFFwriter::$_limit	public	property	* The maximum length for a BIFF record (excluding record header and length field). See _addContinue() * *
PHPExcel_Writer_Excel5_BIFFwriter::getByteOrder	public static	function	* Determine the byte order and store it as class data to avoid * recalculating it for each call to new(). * *
PHPExcel_Writer_Excel5_BIFFwriter::writeData	public	function	* General storage function like _append, but returns string instead of modifying $this->_data * *
PHPExcel_Writer_Excel5_BIFFwriter::writeEof	public	function	* Writes Excel EOF record to indicate the end of a BIFF stream. * * @access private
PHPExcel_Writer_Excel5_BIFFwriter::_addContinue		function	* 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…
PHPExcel_Writer_Excel5_BIFFwriter::_append		function	* General storage function * *
PHPExcel_Writer_Excel5_BIFFwriter::_storeBof		function	* Writes Excel BOF record to indicate the beginning of a stream or * sub-stream in the BIFF file. * *
PHPExcel_Writer_Excel5_BIFFwriter::_storeEof		function	* Writes Excel EOF record to indicate the end of a BIFF stream. * * @access private
PHPExcel_Writer_Excel5_BIFFwriter::__construct	public	function	* Constructor	2