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moodle/lib/excel/Worksheet.php
moodler 8b1fb0c66a Adding a new system for producing Excel documents that are a little 
more compatible with non-Excel spreadsheets.  It also has more features
than the old system that we might take advantage of later.
2003-09-26 04:18:02 +00:00

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<?php
/*
* 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::WriteExcel: A library for generating Excel Spreadsheets
* Copyright (C) 2002 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
*/
require_once('Parser.php');
require_once('BIFFwriter.php');
/**
* Class for generating Excel Spreadsheets
*
* @author Xavier Noguer <xnoguer@rezebra.com>
* @package Spreadsheet_WriteExcel
*/
class Worksheet extends BIFFwriter
{
/**
* Constructor
*
* @param string $name The name of the new worksheet
* @param integer $index The index of the new worksheet
* @param mixed &$activesheet The current activesheet of the workbook we belong to
* @param mixed &$firstsheet The first worksheet in the workbook we belong to
* @param mixed &$url_format The default format for hyperlinks
* @param mixed &$parser The formula parser created for the Workbook
*/
function Worksheet($name,$index,&$activesheet,&$firstsheet,&$url_format,&$parser)
{
$this->BIFFwriter(); // It needs to call its parent's constructor explicitly
$rowmax = 65536; // 16384 in Excel 5
$colmax = 256;
$strmax = 255;
$this->name = $name;
$this->index = $index;
$this->activesheet = &$activesheet;
$this->firstsheet = &$firstsheet;
$this->_url_format = $url_format;
$this->_parser = &$parser;
$this->ext_sheets = array();
$this->_using_tmpfile = 1;
$this->_filehandle = "";
$this->fileclosed = 0;
$this->offset = 0;
$this->xls_rowmax = $rowmax;
$this->xls_colmax = $colmax;
$this->xls_strmax = $strmax;
$this->dim_rowmin = $rowmax +1;
$this->dim_rowmax = 0;
$this->dim_colmin = $colmax +1;
$this->dim_colmax = 0;
$this->colinfo = array();
$this->_selection = array(0,0,0,0);
$this->_panes = array();
$this->_active_pane = 3;
$this->_frozen = 0;
$this->selected = 0;
$this->_paper_size = 0x0;
$this->_orientation = 0x1;
$this->_header = '';
$this->_footer = '';
$this->_hcenter = 0;
$this->_vcenter = 0;
$this->_margin_head = 0.50;
$this->_margin_foot = 0.50;
$this->_margin_left = 0.75;
$this->_margin_right = 0.75;
$this->_margin_top = 1.00;
$this->_margin_bottom = 1.00;
$this->_title_rowmin = NULL;
$this->_title_rowmax = NULL;
$this->_title_colmin = NULL;
$this->_title_colmax = NULL;
$this->_print_rowmin = NULL;
$this->_print_rowmax = NULL;
$this->_print_colmin = NULL;
$this->_print_colmax = NULL;
$this->_print_gridlines = 1;
$this->_print_headers = 0;
$this->_fit_page = 0;
$this->_fit_width = 0;
$this->_fit_height = 0;
$this->_hbreaks = array();
$this->_vbreaks = array();
$this->_protect = 0;
$this->_password = NULL;
$this->col_sizes = array();
$this->row_sizes = array();
$this->_zoom = 100;
$this->_print_scale = 100;
$this->_initialize();
}
/**
* Open a tmp file to store the majority of the Worksheet data. If this fails,
* for example due to write permissions, store the data in memory. This can be
* slow for large files.
*/
function _initialize()
{
// Open tmp file for storing Worksheet data
$fh = tmpfile();
if ( $fh) {
// Store filehandle
$this->_filehandle = $fh;
}
else {
// If tmpfile() fails store data in memory
$this->_using_tmpfile = 0;
}
}
/**
* Add data to the beginning of the workbook (note the reverse order)
* and to the end of the workbook.
*
* @access public
* @see Workbook::store_workbook()
* @param array $sheetnames The array of sheetnames from the Workbook this
* worksheet belongs to
*/
function close($sheetnames)
{
$num_sheets = count($sheetnames);
/***********************************************
* Prepend in reverse order!!
*/
// Prepend the sheet dimensions
$this->_store_dimensions();
// Prepend the sheet password
$this->_store_password();
// Prepend the sheet protection
$this->_store_protect();
// Prepend the page setup
$this->_store_setup();
// Prepend the bottom margin
$this->_store_margin_bottom();
// Prepend the top margin
$this->_store_margin_top();
// Prepend the right margin
$this->_store_margin_right();
// Prepend the left margin
$this->_store_margin_left();
// Prepend the page vertical centering
$this->store_vcenter();
// Prepend the page horizontal centering
$this->store_hcenter();
// Prepend the page footer
$this->store_footer();
// Prepend the page header
$this->store_header();
// Prepend the vertical page breaks
$this->_store_vbreak();
// Prepend the horizontal page breaks
$this->_store_hbreak();
// Prepend WSBOOL
$this->_store_wsbool();
// Prepend GRIDSET
$this->_store_gridset();
// Prepend PRINTGRIDLINES
$this->_store_print_gridlines();
// Prepend PRINTHEADERS
$this->_store_print_headers();
// Prepend EXTERNSHEET references
for ($i = $num_sheets; $i > 0; $i--) {
$sheetname = $sheetnames[$i-1];
$this->_store_externsheet($sheetname);
}
// Prepend the EXTERNCOUNT of external references.
$this->_store_externcount($num_sheets);
// Prepend the COLINFO records if they exist
if (!empty($this->colinfo)){
for($i=0; $i < count($this->colinfo); $i++)
{
$this->_store_colinfo($this->colinfo[$i]);
}
$this->_store_defcol();
}
// Prepend the BOF record
$this->_store_bof(0x0010);
/*
* End of prepend. Read upwards from here.
***********************************************/
// Append
$this->_store_window2();
$this->_store_zoom();
if(!empty($this->_panes))
$this->_store_panes($this->_panes);
$this->_store_selection($this->_selection);
$this->_store_eof();
}
/**
* Retrieve the worksheet name. This is usefull when creating worksheets
* without a name.
*
* @access public
* @return string The worksheet's name
*/
function get_name()
{
return($this->name);
}
/**
* Retrieves data from memory in one chunk, or from disk in $buffer
* sized chunks.
*
* @return string The data
*/
function get_data()
{
$buffer = 4096;
// Return data stored in memory
if (isset($this->_data)) {
$tmp = $this->_data;
unset($this->_data);
$fh = $this->_filehandle;
if ($this->_using_tmpfile) {
fseek($fh, 0);
}
return($tmp);
}
// Return data stored on disk
if ($this->_using_tmpfile) {
if ($tmp = fread($this->_filehandle, $buffer)) {
return($tmp);
}
}
// No data to return
return('');
}
/**
* Set this worksheet as a selected worksheet, i.e. the worksheet has its tab
* highlighted.
*
* @access public
*/
function select()
{
$this->selected = 1;
}
/**
* Set this worksheet as the active worksheet, i.e. the worksheet that is
* displayed when the workbook is opened. Also set it as selected.
*
* @access public
*/
function activate()
{
$this->selected = 1;
$this->activesheet =& $this->index;
}
/**
* Set this worksheet as the first visible sheet. This is necessary
* when there are a large number of worksheets and the activated
* worksheet is not visible on the screen.
*
* @access public
*/
function set_first_sheet()
{
$this->firstsheet = $this->index;
}
/**
* Set the worksheet protection flag to prevent accidental modification and to
* hide formulas if the locked and hidden format properties have been set.
*
* @access public
* @param string $password The password to use for protecting the sheet.
*/
function protect($password)
{
$this->_protect = 1;
$this->_password = $this->_encode_password($password);
}
/**
* Set the width of a single column or a range of columns.
*
* @access public
* @see _store_colinfo()
* @param integer $firstcol first column on the range
* @param integer $lastcol last column on the range
* @param integer $width width to set
* @param mixed $format The optional XF format to apply to the columns
* @param integer $hidden The optional hidden atribute
*/
function set_column($firstcol, $lastcol, $width, $format = 0, $hidden = 0)
{
$this->colinfo[] = array($firstcol, $lastcol, $width, $format, $hidden);
// Set width to zero if column is hidden
$width = ($hidden) ? 0 : $width;
for($col = $firstcol; $col <= $lastcol; $col++) {
$this->col_sizes[$col] = $width;
}
}
/**
* Set which cell or cells are selected in a worksheet
*
* @access public
* @param integer $first_row first row in the selected quadrant
* @param integer $first_column first column in the selected quadrant
* @param integer $last_row last row in the selected quadrant
* @param integer $last_column last column in the selected quadrant
* @see _store_selection()
*/
function set_selection($first_row,$first_column,$last_row,$last_column)
{
$this->_selection = array($first_row,$first_column,$last_row,$last_column);
}
/**
* Set panes and mark them as frozen.
*
* @access public
* @param array $panes This is the only parameter received and is composed of the following:
* 0 => Vertical split position,
* 1 => Horizontal split position
* 2 => Top row visible
* 3 => Leftmost column visible
* 4 => Active pane
*/
function freeze_panes($panes)
{
$this->_frozen = 1;
$this->_panes = $panes;
}
/**
* Set panes and mark them as unfrozen.
*
* @access public
* @param array $panes This is the only parameter received and is composed of the following:
* 0 => Vertical split position,
* 1 => Horizontal split position
* 2 => Top row visible
* 3 => Leftmost column visible
* 4 => Active pane
*/
function thaw_panes($panes)
{
$this->_frozen = 0;
$this->_panes = $panes;
}
/**
* Set the page orientation as portrait.
*
* @access public
*/
function set_portrait()
{
$this->_orientation = 1;
}
/**
* Set the page orientation as landscape.
*
* @access public
*/
function set_landscape()
{
$this->_orientation = 0;
}
/**
* Set the paper type. Ex. 1 = US Letter, 9 = A4
*
* @access public
* @param integer $size The type of paper size to use
*/
function set_paper($size = 0)
{
$this->_paper_size = $size;
}
/**
* Set the page header caption and optional margin.
*
* @access public
* @param string $string The header text
* @param float $margin optional head margin in inches.
*/
function set_header($string,$margin = 0.50)
{
if (strlen($string) >= 255) {
//carp 'Header string must be less than 255 characters';
return;
}
$this->_header = $string;
$this->_margin_head = $margin;
}
/**
* Set the page footer caption and optional margin.
*
* @access public
* @param string $string The footer text
* @param float $margin optional foot margin in inches.
*/
function set_footer($string,$margin = 0.50)
{
if (strlen($string) >= 255) {
//carp 'Footer string must be less than 255 characters';
return;
}
$this->_footer = $string;
$this->_margin_foot = $margin;
}
/**
* Center the page horinzontally.
*
* @access public
* @param integer $center the optional value for centering. Defaults to 1 (center).
*/
function center_horizontally($center = 1)
{
$this->_hcenter = $center;
}
/**
* Center the page horinzontally.
*
* @access public
* @param integer $center the optional value for centering. Defaults to 1 (center).
*/
function center_vertically($center = 1)
{
$this->_vcenter = $center;
}
/**
* Set all the page margins to the same value in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margins($margin)
{
$this->set_margin_left($margin);
$this->set_margin_right($margin);
$this->set_margin_top($margin);
$this->set_margin_bottom($margin);
}
/**
* Set the left and right margins to the same value in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margins_LR($margin)
{
$this->set_margin_left($margin);
$this->set_margin_right($margin);
}
/**
* Set the top and bottom margins to the same value in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margins_TB($margin)
{
$this->set_margin_top($margin);
$this->set_margin_bottom($margin);
}
/**
* Set the left margin in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margin_left($margin = 0.75)
{
$this->_margin_left = $margin;
}
/**
* Set the right margin in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margin_right($margin = 0.75)
{
$this->_margin_right = $margin;
}
/**
* Set the top margin in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margin_top($margin = 1.00)
{
$this->_margin_top = $margin;
}
/**
* Set the bottom margin in inches.
*
* @access public
* @param float $margin The margin to set in inches
*/
function set_margin_bottom($margin = 1.00)
{
$this->_margin_bottom = $margin;
}
/**
* Set the rows to repeat at the top of each printed page. See also the
* _store_name_xxxx() methods in Workbook.php
*
* @access public
* @param integer $first_row First row to repeat
* @param integer $last_row Last row to repeat. Optional.
*/
function repeat_rows($first_row, $last_row = NULL)
{
$this->_title_rowmin = $first_row;
if(isset($last_row)) { //Second row is optional
$this->_title_rowmax = $last_row;
}
else {
$this->_title_rowmax = $first_row;
}
}
/**
* Set the columns to repeat at the left hand side of each printed page.
* See also the _store_names() methods in Workbook.php
*
* @access public
* @param integer $first_col First column to repeat
* @param integer $last_col Last column to repeat. Optional.
*/
function repeat_columns($first_col, $last_col = NULL)
{
$this->_title_colmin = $first_col;
if(isset($last_col)) { // Second col is optional
$this->_title_colmax = $last_col;
}
else {
$this->_title_colmax = $first_col;
}
}
/**
* Set the area of each worksheet that will be printed.
*
* @access public
* @see Workbook::_store_names()
* @param integer $first_row First row of the area to print
* @param integer $first_col First column of the area to print
* @param integer $last_row Last row of the area to print
* @param integer $last_col Last column of the area to print
*/
function print_area($first_row, $first_col, $last_row, $last_col)
{
$this->_print_rowmin = $first_row;
$this->_print_colmin = $first_col;
$this->_print_rowmax = $last_row;
$this->_print_colmax = $last_col;
}
/**
* Set the option to hide gridlines on the printed page.
*
* @access public
* @see _store_print_gridlines(), _store_gridset()
*/
function hide_gridlines()
{
$this->_print_gridlines = 0;
}
/**
* Set the option to print the row and column headers on the printed page.
* See also the _store_print_headers() method below.
*
* @access public
* @see _store_print_headers()
* @param integer $print Whether to print the headers or not. Defaults to 1 (print).
*/
function print_row_col_headers($print = 1)
{
$this->_print_headers = $print;
}
/**
* Store the vertical and horizontal number of pages that will define the
* maximum area printed. It doesn't seem to work with OpenOffice.
*
* @access public
* @param integer $width Maximun width of printed area in pages
* @param integer $heigth Maximun heigth of printed area in pages
* @see set_print_scale()
*/
function fit_to_pages($width, $height)
{
$this->_fit_page = 1;
$this->_fit_width = $width;
$this->_fit_height = $height;
}
/**
* Store the horizontal page breaks on a worksheet (for printing).
* The breaks represent the row after which the break is inserted.
*
* @access public
* @param array $breaks Array containing the horizontal page breaks
*/
function set_h_pagebreaks($breaks)
{
foreach($breaks as $break) {
array_push($this->_hbreaks,$break);
}
}
/**
* Store the vertical page breaks on a worksheet (for printing).
* The breaks represent the column after which the break is inserted.
*
* @access public
* @param array $breaks Array containing the vertical page breaks
*/
function set_v_pagebreaks($breaks)
{
foreach($breaks as $break) {
array_push($this->_vbreaks,$break);
}
}
/**
* Set the worksheet zoom factor.
*
* @access public
* @param integer $scale The zoom factor
*/
function set_zoom($scale = 100)
{
// Confine the scale to Excel's range
if ($scale < 10 or $scale > 400) {
//carp "Zoom factor $scale outside range: 10 <= zoom <= 400";
$scale = 100;
}
$this->_zoom = floor($scale);
}
/**
* Set the scale factor for the printed page.
* It turns off the "fit to page" option
*
* @access public
* @param integer $scale The optional scale factor. Defaults to 100
*/
function set_print_scale($scale = 100)
{
// Confine the scale to Excel's range
if ($scale < 10 or $scale > 400)
{
// REPLACE THIS FOR A WARNING
die("Print scale $scale outside range: 10 <= zoom <= 400");
$scale = 100;
}
// Turn off "fit to page" option
$this->_fit_page = 0;
$this->_print_scale = floor($scale);
}
/**
* Map to the appropriate write method acording to the token recieved.
*
* @access public
* @param integer $row The row of the cell we are writing to
* @param integer $col The column of the cell we are writing to
* @param mixed $token What we are writing
* @param mixed $format The optional format to apply to the cell
*/
function write($row, $col, $token, $format = 0)
{
// Check for a cell reference in A1 notation and substitute row and column
/*if ($_[0] =~ /^\D/) {
@_ = $this->_substitute_cellref(@_);
}*/
/*
# Match an array ref.
if (ref $token eq "ARRAY") {
return $this->write_row(@_);
}*/
// Match number
if (preg_match("/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/",$token)) {
return $this->write_number($row,$col,$token,$format);
}
// Match http or ftp URL
elseif (preg_match("/^[fh]tt?p:\/\//",$token)) {
return $this->write_url($row, $col, $token, $format);
}
// Match mailto:
elseif (preg_match("/^mailto:/",$token)) {
return $this->write_url($row, $col, $token, $format);
}
// Match internal or external sheet link
elseif (preg_match("/^(?:in|ex)ternal:/",$token)) {
return $this->write_url($row, $col, $token, $format);
}
// Match formula
elseif (preg_match("/^=/",$token)) {
return $this->write_formula($row, $col, $token, $format);
}
// Match formula
elseif (preg_match("/^@/",$token)) {
return $this->write_formula($row, $col, $token, $format);
}
// Match blank
elseif ($token == '') {
return $this->write_blank($row,$col,$format);
}
// Default: match string
else {
return $this->write_string($row,$col,$token,$format);
}
}
/**
* Returns an index to the XF record in the workbook
*
* @param mixed $format The optional XF format
* @return integer The XF record index
*/
function _XF(&$format)
{
if($format != 0)
{
return($format->get_xf_index());
}
else
{
return(0x0F);
}
}
/******************************************************************************
*******************************************************************************
*
* Internal methods
*/
/**
* Store Worksheet data in memory using the parent's class append() or to a
* temporary file, the default.
*
* @param string $data The binary data to append
*/
function _append($data)
{
if ($this->_using_tmpfile)
{
// Add CONTINUE records if necessary
if (strlen($data) > $this->_limit) {
$data = $this->_add_continue($data);
}
fwrite($this->_filehandle,$data);
$this->_datasize += strlen($data);
}
else {
parent::_append($data);
}
}
/**
* Substitute an Excel cell reference in A1 notation for zero based row and
* column values in an argument list.
*
* Ex: ("A4", "Hello") is converted to (3, 0, "Hello").
*
* @param string $cell The cell reference. Or range of cells.
* @return array
*/
function _substitute_cellref($cell)
{
$cell = strtoupper($cell);
// Convert a column range: 'A:A' or 'B:G'
if (preg_match("/([A-I]?[A-Z]):([A-I]?[A-Z])/",$cell,$match)) {
list($no_use, $col1) = $this->_cell_to_rowcol($match[1] .'1'); // Add a dummy row
list($no_use, $col2) = $this->_cell_to_rowcol($match[2] .'1'); // Add a dummy row
return(array($col1, $col2));
}
// Convert a cell range: 'A1:B7'
if (preg_match("/\$?([A-I]?[A-Z]\$?\d+):\$?([A-I]?[A-Z]\$?\d+)/",$cell,$match)) {
list($row1, $col1) = $this->_cell_to_rowcol($match[1]);
list($row2, $col2) = $this->_cell_to_rowcol($match[2]);
return(array($row1, $col1, $row2, $col2));
}
// Convert a cell reference: 'A1' or 'AD2000'
if (preg_match("/\$?([A-I]?[A-Z]\$?\d+)/",$cell)) {
list($row1, $col1) = $this->_cell_to_rowcol($match[1]);
return(array($row1, $col1));
}
die("Unknown cell reference $cell ");
}
/**
* Convert an Excel cell reference in A1 notation to a zero based row and column
* reference; converts C1 to (0, 2).
*
* @param string $cell The cell reference.
* @return array containing (row, column)
*/
function _cell_to_rowcol($cell)
{
preg_match("/\$?([A-I]?[A-Z])\$?(\d+)/",$cell,$match);
$col = $match[1];
$row = $match[2];
// Convert base26 column string to number
$chars = split('', $col);
$expn = 0;
$col = 0;
while ($chars) {
$char = array_pop($chars); // LS char first
$col += (ord($char) -ord('A') +1) * pow(26,$expn);
$expn++;
}
// Convert 1-index to zero-index
$row--;
$col--;
return(array($row, $col));
}
/**
* Based on the algorithm provided by Daniel Rentz of OpenOffice.
*
* @param string $plaintext The password to be encoded in plaintext.
* @return string The encoded password
*/
function _encode_password($plaintext)
{
$password = 0x0000;
$i = 1; // char position
// split the plain text password in its component characters
$chars = preg_split('//', $plaintext, -1, PREG_SPLIT_NO_EMPTY);
foreach($chars as $char)
{
$value = ord($char) << $i; // shifted ASCII value
$bit_16 = $value & 0x8000; // the bit 16
$bit_16 >>= 15; // 0x0000 or 0x0001
//$bit_17 = $value & 0x00010000;
//$bit_17 >>= 15;
$value &= 0x7fff; // first 15 bits
$password ^= ($value | $bit_16);
//$password ^= ($value | $bit_16 | $bit_17);
$i++;
}
$password ^= strlen($plaintext);
$password ^= 0xCE4B;
return($password);
}
/******************************************************************************
*******************************************************************************
*
* BIFF RECORDS
*/
/**
* Write a double to the specified row and column (zero indexed).
* An integer can be written as a double. Excel will display an
* integer. $format is optional.
*
* Returns 0 : normal termination
* -2 : row or column out of range
*
* @access public
* @param integer $row Zero indexed row
* @param integer $col Zero indexed column
* @param float $num The number to write
* @param mixed $format The optional XF format
*/
function write_number($row, $col, $num, $format = 0)
{
$record = 0x0203; // Record identifier
$length = 0x000E; // Number of bytes to follow
$xf = $this->_XF($format); // The cell format
// Check that row and col are valid and store max and min values
if ($row >= $this->xls_rowmax)
{
return(-2);
}
if ($col >= $this->xls_colmax)
{
return(-2);
}
if ($row < $this->dim_rowmin)
{
$this->dim_rowmin = $row;
}
if ($row > $this->dim_rowmax)
{
$this->dim_rowmax = $row;
}
if ($col < $this->dim_colmin)
{
$this->dim_colmin = $col;
}
if ($col > $this->dim_colmax)
{
$this->dim_colmax = $col;
}
$header = pack("vv", $record, $length);
$data = pack("vvv", $row, $col, $xf);
$xl_double = pack("d", $num);
if ($this->_byte_order) // if it's Big Endian
{
$xl_double = strrev($xl_double);
}
$this->_append($header.$data.$xl_double);
return(0);
}
/**
* Write a string to the specified row and column (zero indexed).
* NOTE: there is an Excel 5 defined limit of 255 characters.
* $format is optional.
* Returns 0 : normal termination
* -1 : insufficient number of arguments
* -2 : row or column out of range
* -3 : long string truncated to 255 chars
*
* @access public
* @param integer $row Zero indexed row
* @param integer $col Zero indexed column
* @param string $str The string to write
* @param mixed $format The XF format for the cell
*/
function write_string($row, $col, $str, $format = 0)
{
$strlen = strlen($str);
$record = 0x0204; // Record identifier
$length = 0x0008 + $strlen; // Bytes to follow
$xf = $this->_XF($format); // The cell format
$str_error = 0;
// Check that row and col are valid and store max and min values
if ($row >= $this->xls_rowmax)
{
return(-2);
}
if ($col >= $this->xls_colmax)
{
return(-2);
}
if ($row < $this->dim_rowmin)
{
$this->dim_rowmin = $row;
}
if ($row > $this->dim_rowmax)
{
$this->dim_rowmax = $row;
}
if ($col < $this->dim_colmin)
{
$this->dim_colmin = $col;
}
if ($col > $this->dim_colmax)
{
$this->dim_colmax = $col;
}
if ($strlen > $this->xls_strmax) // LABEL must be < 255 chars
{
$str = substr($str, 0, $this->xls_strmax);
$length = 0x0008 + $this->xls_strmax;
$strlen = $this->xls_strmax;
$str_error = -3;
}
$header = pack("vv", $record, $length);
$data = pack("vvvv", $row, $col, $xf, $strlen);
$this->_append($header.$data.$str);
return($str_error);
}
/**
* Writes a note associated with the cell given by the row and column.
* NOTE records don't have a length limit.
*
* @access public
* @param integer $row Zero indexed row
* @param integer $col Zero indexed column
* @param string $note The note to write
*/
function write_note($row, $col, $note)
{
$note_length = strlen($note);
$record = 0x001C; // Record identifier
$max_length = 2048; // Maximun length for a NOTE record
//$length = 0x0006 + $note_length; // Bytes to follow
// Check that row and col are valid and store max and min values
if ($row >= $this->xls_rowmax)
{
return(-2);
}
if ($col >= $this->xls_colmax)
{
return(-2);
}
if ($row < $this->dim_rowmin)
{
$this->dim_rowmin = $row;
}
if ($row > $this->dim_rowmax)
{
$this->dim_rowmax = $row;
}
if ($col < $this->dim_colmin)
{
$this->dim_colmin = $col;
}
if ($col > $this->dim_colmax)
{
$this->dim_colmax = $col;
}
// Length for this record is no more than 2048 + 6
$length = 0x0006 + min($note_length, 2048);
$header = pack("vv", $record, $length);
$data = pack("vvv", $row, $col, $note_length);
$this->_append($header.$data.substr($note, 0, 2048));
for($i = $max_length; $i < $note_length; $i += $max_length)
{
$chunk = substr($note, $i, $max_length);
$length = 0x0006 + strlen($chunk);
$header = pack("vv", $record, $length);
$data = pack("vvv", -1, 0, strlen($chunk));
$this->_append($header.$data.$chunk);
}
return(0);
}
/**
* Write a blank cell to the specified row and column (zero indexed).
* A blank cell is used to specify formatting without adding a string
* or a number.
*
* A blank cell without a format serves no purpose. Therefore, we don't write
* a BLANK record unless a format is specified. This is mainly an optimisation
* for the write_row() and write_col() methods.
*
* Returns 0 : normal termination (including no format)
* -1 : insufficient number of arguments
* -2 : row or column out of range
*
* @access public
* @param integer $row Zero indexed row
* @param integer $col Zero indexed column
* @param mixed $format The XF format
*/
function write_blank($row, $col, $format = 0)
{
// Don't write a blank cell unless it has a format
if ($format == 0)
{
return(0);
}
$record = 0x0201; // Record identifier
$length = 0x0006; // Number of bytes to follow
$xf = $this->_XF($format); // The cell format
// Check that row and col are valid and store max and min values
if ($row >= $this->xls_rowmax)
{
return(-2);
}
if ($col >= $this->xls_colmax)
{
return(-2);
}
if ($row < $this->dim_rowmin)
{
$this->dim_rowmin = $row;
}
if ($row > $this->dim_rowmax)
{
$this->dim_rowmax = $row;
}
if ($col < $this->dim_colmin)
{
$this->dim_colmin = $col;
}
if ($col > $this->dim_colmax)
{
$this->dim_colmax = $col;
}
$header = pack("vv", $record, $length);
$data = pack("vvv", $row, $col, $xf);
$this->_append($header.$data);
return 0;
}
/**
* Write a formula to the specified row and column (zero indexed).
* The textual representation of the formula is passed to the parser in
* Parser.php which returns a packed binary string.
*
* Returns 0 : normal termination
* -2 : row or column out of range
*
* @access public
* @param integer $row Zero indexed row
* @param integer $col Zero indexed column
* @param string $formula The formula text string
* @param mixed $format The optional XF format
*/
function write_formula($row, $col, $formula, $format = 0)
{
$record = 0x0006; // Record identifier
// Excel normally stores the last calculated value of the formula in $num.
// Clearly we are not in a position to calculate this a priori. Instead
// we set $num to zero and set the option flags in $grbit to ensure
// automatic calculation of the formula when the file is opened.
//
$xf = $this->_XF($format); // The cell format
$num = 0x00; // Current value of formula
$grbit = 0x03; // Option flags
$chn = 0x0000; // Must be zero
// Check that row and col are valid and store max and min values
if ($row >= $this->xls_rowmax)
{
return(-2);
}
if ($col >= $this->xls_colmax)
{
return(-2);
}
if ($row < $this->dim_rowmin)
{
$this->dim_rowmin = $row;
}
if ($row > $this->dim_rowmax)
{
$this->dim_rowmax = $row;
}
if ($col < $this->dim_colmin)
{
$this->dim_colmin = $col;
}
if ($col > $this->dim_colmax)
{
$this->dim_colmax = $col;
}
// Strip the '=' or '@' sign at the beginning of the formula string
if (ereg("^=",$formula)) {
$formula = preg_replace("/(^=)/","",$formula);
}
elseif(ereg("^@",$formula)) {
$formula = preg_replace("/(^@)/","",$formula);
}
else {
die("Unrecognised character for formula");
}
// Parse the formula using the parser in Parser.php
//$tree = new Parser($this->_byte_order);
$this->_parser->parse($formula);
//$tree->parse($formula);
$formula = $this->_parser->to_reverse_polish();
$formlen = strlen($formula); // Length of the binary string
$length = 0x16 + $formlen; // Length of the record data
$header = pack("vv", $record, $length);
$data = pack("vvvdvVv", $row, $col, $xf, $num,
$grbit, $chn, $formlen);
$this->_append($header.$data.$formula);
return 0;
}
/**
* Write a hyperlink. This is comprised of two elements: the visible label and
* the invisible link. The visible label is the same as the link unless an
* alternative string is specified. The label is written using the
* write_string() method. Therefore the 255 characters string limit applies.
* $string and $format are optional and their order is interchangeable.
*
* The hyperlink can be to a http, ftp, mail, internal sheet, or external
* directory url.
*
* Returns 0 : normal termination
* -1 : insufficient number of arguments
* -2 : row or column out of range
* -3 : long string truncated to 255 chars
*
* @access public
* @param integer $row Row
* @param integer $col Column
* @param string $url URL string
* @param string $string Alternative label
* @param mixed $format The cell format
*/
function write_url($row, $col, $url, $string = '', $format = 0)
{
// Add start row and col to arg list
return($this->_write_url_range($row, $col, $row, $col, $url, $string, $format));
}
/**
* This is the more general form of write_url(). It allows a hyperlink to be
* written to a range of cells. This function also decides the type of hyperlink
* to be written. These are either, Web (http, ftp, mailto), Internal
* (Sheet1!A1) or external ('c:\temp\foo.xls#Sheet1!A1').
*
* See also write_url() above for a general description and return values.
*
* @param integer $row1 Start row
* @param integer $col1 Start column
* @param integer $row2 End row
* @param integer $col2 End column
* @param string $url URL string
* @param string $string Alternative label
* @param mixed $format The cell format
*/
function _write_url_range($row1, $col1, $row2, $col2, $url, $string = '', $format = 0)
{
// Check for internal/external sheet links or default to web link
if (preg_match('[^internal:]', $url)) {
return($this->_write_url_internal($row1, $col1, $row2, $col2, $url, $string, $format));
}
if (preg_match('[^external:]', $url)) {
return($this->_write_url_external($row1, $col1, $row2, $col2, $url, $string, $format));
}
return($this->_write_url_web($row1, $col1, $row2, $col2, $url, $string, $format));
}
/**
* Used to write http, ftp and mailto hyperlinks.
* The link type ($options) is 0x03 is the same as absolute dir ref without
* sheet. However it is differentiated by the $unknown2 data stream.
*
* @see write_url()
* @param integer $row1 Start row
* @param integer $col1 Start column
* @param integer $row2 End row
* @param integer $col2 End column
* @param string $url URL string
* @param string $str Alternative label
* @param mixed $format The cell format
*/
function _write_url_web($row1, $col1, $row2, $col2, $url, $str, $format = 0)
{
$record = 0x01B8; // Record identifier
$length = 0x00000; // Bytes to follow
if($format == 0) {
$format = $this->_url_format;
}
// Write the visible label using the write_string() method.
if($str == '') {
$str = $url;
}
$str_error = $this->write_string($row1, $col1, $str, $format);
if ($str_error == -2) {
return($str_error);
}
// Pack the undocumented parts of the hyperlink stream
$unknown1 = pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");
$unknown2 = pack("H*", "E0C9EA79F9BACE118C8200AA004BA90B");
// Pack the option flags
$options = pack("V", 0x03);
// Convert URL to a null terminated wchar string
$url = join("\0", preg_split("''", $url, -1, PREG_SPLIT_NO_EMPTY));
$url = $url . "\0\0\0";
// Pack the length of the URL
$url_len = pack("V", strlen($url));
// Calculate the data length
$length = 0x34 + strlen($url);
// Pack the header data
$header = pack("vv", $record, $length);
$data = pack("vvvv", $row1, $row2, $col1, $col2);
// Write the packed data
$this->_append( $header. $data.
$unknown1. $options.
$unknown2. $url_len. $url);
return($str_error);
}
/**
* Used to write internal reference hyperlinks such as "Sheet1!A1".
*
* @see write_url()
* @param integer $row1 Start row
* @param integer $col1 Start column
* @param integer $row2 End row
* @param integer $col2 End column
* @param string $url URL string
* @param string $str Alternative label
* @param mixed $format The cell format
*/
function _write_url_internal($row1, $col1, $row2, $col2, $url, $str, $format = 0)
{
$record = 0x01B8; // Record identifier
$length = 0x00000; // Bytes to follow
if ($format == 0) {
$format = $this->_url_format;
}
// Strip URL type
$url = preg_replace('s[^internal:]', '', $url);
// Write the visible label
if($str == '') {
$str = $url;
}
$str_error = $this->write_string($row1, $col1, $str, $format);
if ($str_error == -2) {
return($str_error);
}
// Pack the undocumented parts of the hyperlink stream
$unknown1 = pack("H*", "D0C9EA79F9BACE118C8200AA004BA90B02000000");
// Pack the option flags
$options = pack("V", 0x08);
// Convert the URL type and to a null terminated wchar string
$url = join("\0", preg_split("''", $url, -1, PREG_SPLIT_NO_EMPTY));
$url = $url . "\0\0\0";
// Pack the length of the URL as chars (not wchars)
$url_len = pack("V", floor(strlen($url)/2));
// Calculate the data length
$length = 0x24 + strlen($url);
// Pack the header data
$header = pack("vv", $record, $length);
$data = pack("vvvv", $row1, $row2, $col1, $col2);
// Write the packed data
$this->_append($header. $data.
$unknown1. $options.
$url_len. $url);
return($str_error);
}
/**
* Write links to external directory names such as 'c:\foo.xls',
* c:\foo.xls#Sheet1!A1', '../../foo.xls'. and '../../foo.xls#Sheet1!A1'.
*
* Note: Excel writes some relative links with the $dir_long string. We ignore
* these cases for the sake of simpler code.
*
* @see write_url()
* @param integer $row1 Start row
* @param integer $col1 Start column
* @param integer $row2 End row
* @param integer $col2 End column
* @param string $url URL string
* @param string $str Alternative label
* @param mixed $format The cell format
*/
function _write_url_external($row1, $col1, $row2, $col2, $url, $str, $format = 0)
{
// Network drives are different. We will handle them separately
// MS/Novell network drives and shares start with \\
if (preg_match('[^external:\\\\]', $url)) {
return($this->_write_url_external_net($row1, $col1, $row2, $col2, $url, $str, $format));
}
$record = 0x01B8; // Record identifier
$length = 0x00000; // Bytes to follow
if ($format == 0) {
$format = $this->_url_format;
}
// Strip URL type and change Unix dir separator to Dos style (if needed)
//
$url = preg_replace('[^external:]', '', $url);
$url = preg_replace('[/]', "\\", $url);
// Write the visible label
if ($str == '') {
$str = preg_replace('[\#]', ' - ', $url);
}
$str_error = $this->write_string($row1, $col1, $str, $format);
if ($str_error == -2) {
return($str_error);
}
// Determine if the link is relative or absolute:
// relative if link contains no dir separator, "somefile.xls"
// relative if link starts with up-dir, "..\..\somefile.xls"
// otherwise, absolute
$absolute = 0x02; // Bit mask
if (!preg_match('[\\]', $url)) {
$absolute = 0x00;
}
if (preg_match('[^\.\.\\]', $url)) {
$absolute = 0x00;
}
// Determine if the link contains a sheet reference and change some of the
// parameters accordingly.
// Split the dir name and sheet name (if it exists)
list($dir_long , $sheet) = split('/\#/', $url);
$link_type = 0x01 | $absolute;
if (isset($sheet)) {
$link_type |= 0x08;
$sheet_len = pack("V", strlen($sheet) + 0x01);
$sheet = join("\0", split('', $sheet));
$sheet .= "\0\0\0";
}
else {
$sheet_len = '';
$sheet = '';
}
// Pack the link type
$link_type = pack("V", $link_type);
// Calculate the up-level dir count e.g.. (..\..\..\ == 3)
$up_count = preg_match_all("/\.\.\\/", $dir_long, $useless);
$up_count = pack("v", $up_count);
// Store the short dos dir name (null terminated)
$dir_short = preg_replace('/\.\.\\/', '', $dir_long) . "\0";
// Store the long dir name as a wchar string (non-null terminated)
$dir_long = join("\0", split('', $dir_long));
$dir_long = $dir_long . "\0";
// Pack the lengths of the dir strings
$dir_short_len = pack("V", strlen($dir_short) );
$dir_long_len = pack("V", strlen($dir_long) );
$stream_len = pack("V", strlen($dir_long) + 0x06);
// Pack the undocumented parts of the hyperlink stream
$unknown1 = pack("H*",'D0C9EA79F9BACE118C8200AA004BA90B02000000' );
$unknown2 = pack("H*",'0303000000000000C000000000000046' );
$unknown3 = pack("H*",'FFFFADDE000000000000000000000000000000000000000');
$unknown4 = pack("v", 0x03 );
// Pack the main data stream
$data = pack("vvvv", $row1, $row2, $col1, $col2) .
$unknown1 .
$link_type .
$unknown2 .
$up_count .
$dir_short_len.
$dir_short .
$unknown3 .
$stream_len .
$dir_long_len .
$unknown4 .
$dir_long .
$sheet_len .
$sheet ;
// Pack the header data
$length = strlen($data);
$header = pack("vv", $record, $length);
// Write the packed data
$this->_append($header. $data);
return($str_error);
}
/*
###############################################################################
#
# write_url_xxx($row1, $col1, $row2, $col2, $url, $string, $format)
#
# Write links to external MS/Novell network drives and shares such as
# '//NETWORK/share/foo.xls' and '//NETWORK/share/foo.xls#Sheet1!A1'.
#
# See also write_url() above for a general description and return values.
#
sub _write_url_external_net {
my $this = shift;
my $record = 0x01B8; # Record identifier
my $length = 0x00000; # Bytes to follow
my $row1 = $_[0]; # Start row
my $col1 = $_[1]; # Start column
my $row2 = $_[2]; # End row
my $col2 = $_[3]; # End column
my $url = $_[4]; # URL string
my $str = $_[5]; # Alternative label
my $xf = $_[6] || $this->{_url_format};# The cell format
# Strip URL type and change Unix dir separator to Dos style (if needed)
#
$url =~ s[^external:][];
$url =~ s[/][\\]g;
# Write the visible label
($str = $url) =~ s[\#][ - ] unless defined $str;
my $str_error = $this->write_string($row1, $col1, $str, $xf);
return $str_error if $str_error == -2;
# Determine if the link contains a sheet reference and change some of the
# parameters accordingly.
# Split the dir name and sheet name (if it exists)
#
my ($dir_long , $sheet) = split /\#/, $url;
my $link_type = 0x0103; # Always absolute
my $sheet_len;
if (defined $sheet) {
$link_type |= 0x08;
$sheet_len = pack("V", length($sheet) + 0x01);
$sheet = join("\0", split('', $sheet));
$sheet .= "\0\0\0";
}
else {
$sheet_len = '';
$sheet = '';
}
# Pack the link type
$link_type = pack("V", $link_type);
# Make the string null terminated
$dir_long = $dir_long . "\0";
# Pack the lengths of the dir string
my $dir_long_len = pack("V", length $dir_long);
# Store the long dir name as a wchar string (non-null terminated)
$dir_long = join("\0", split('', $dir_long));
$dir_long = $dir_long . "\0";
# Pack the undocumented part of the hyperlink stream
my $unknown1 = pack("H*",'D0C9EA79F9BACE118C8200AA004BA90B02000000');
# Pack the main data stream
my $data = pack("vvvv", $row1, $row2, $col1, $col2) .
$unknown1 .
$link_type .
$dir_long_len .
$dir_long .
$sheet_len .
$sheet ;
# Pack the header data
$length = length $data;
my $header = pack("vv", $record, $length);
# Write the packed data
$this->_append( $header, $data);
return $str_error;
}*/
/**
* This method is used to set the height and XF format for a row.
* Writes the BIFF record ROW.
*
* @access public
* @param integer $row The row to set
* @param integer $height Height we are giving to the row.
* Use NULL to set XF without setting height
* @param mixed $format XF format we are giving to the row
*/
function set_row($row, $height, $format = 0)
{
$record = 0x0208; // Record identifier
$length = 0x0010; // Number of bytes to follow
$colMic = 0x0000; // First defined column
$colMac = 0x0000; // Last defined column
$irwMac = 0x0000; // Used by Excel to optimise loading
$reserved = 0x0000; // Reserved
$grbit = 0x01C0; // Option flags. (monkey) see $1 do
$ixfe = $this->_XF($format); // XF index
// Use set_row($row, NULL, $XF) to set XF without setting height
if ($height != NULL) {
$miyRw = $height * 20; // row height
}
else {
$miyRw = 0xff; // default row height is 256
}
$header = pack("vv", $record, $length);
$data = pack("vvvvvvvv", $row, $colMic, $colMac, $miyRw,
$irwMac,$reserved, $grbit, $ixfe);
$this->_append($header.$data);
}
/**
* Writes Excel DIMENSIONS to define the area in which there is data.
*/
function _store_dimensions()
{
$record = 0x0000; // Record identifier
$length = 0x000A; // Number of bytes to follow
$row_min = $this->dim_rowmin; // First row
$row_max = $this->dim_rowmax; // Last row plus 1
$col_min = $this->dim_colmin; // First column
$col_max = $this->dim_colmax; // Last column plus 1
$reserved = 0x0000; // Reserved by Excel
$header = pack("vv", $record, $length);
$data = pack("vvvvv", $row_min, $row_max,
$col_min, $col_max, $reserved);
$this->_prepend($header.$data);
}
/**
* Write BIFF record Window2.
*/
function _store_window2()
{
$record = 0x023E; // Record identifier
$length = 0x000A; // Number of bytes to follow
$grbit = 0x00B6; // Option flags
$rwTop = 0x0000; // Top row visible in window
$colLeft = 0x0000; // Leftmost column visible in window
$rgbHdr = 0x00000000; // Row/column heading and gridline color
// The options flags that comprise $grbit
$fDspFmla = 0; // 0 - bit
$fDspGrid = 1; // 1
$fDspRwCol = 1; // 2
$fFrozen = $this->_frozen; // 3
$fDspZeros = 1; // 4
$fDefaultHdr = 1; // 5
$fArabic = 0; // 6
$fDspGuts = 1; // 7
$fFrozenNoSplit = 0; // 0 - bit
$fSelected = $this->selected; // 1
$fPaged = 1; // 2
$grbit = $fDspFmla;
$grbit |= $fDspGrid << 1;
$grbit |= $fDspRwCol << 2;
$grbit |= $fFrozen << 3;
$grbit |= $fDspZeros << 4;
$grbit |= $fDefaultHdr << 5;
$grbit |= $fArabic << 6;
$grbit |= $fDspGuts << 7;
$grbit |= $fFrozenNoSplit << 8;
$grbit |= $fSelected << 9;
$grbit |= $fPaged << 10;
$header = pack("vv", $record, $length);
$data = pack("vvvV", $grbit, $rwTop, $colLeft, $rgbHdr);
$this->_append($header.$data);
}
/**
* Write BIFF record DEFCOLWIDTH if COLINFO records are in use.
*/
function _store_defcol()
{
$record = 0x0055; // Record identifier
$length = 0x0002; // Number of bytes to follow
$colwidth = 0x0008; // Default column width
$header = pack("vv", $record, $length);
$data = pack("v", $colwidth);
$this->_prepend($header.$data);
}
/**
* Write BIFF record COLINFO to define column widths
*
* Note: The SDK says the record length is 0x0B but Excel writes a 0x0C
* length record.
*
* @param array $col_array This is the only parameter received and is composed of the following:
* 0 => First formatted column,
* 1 => Last formatted column,
* 2 => Col width (8.43 is Excel default),
* 3 => The optional XF format of the column,
* 4 => Option flags.
*/
function _store_colinfo($col_array)
{
if(isset($col_array[0])) {
$colFirst = $col_array[0];
}
if(isset($col_array[1])) {
$colLast = $col_array[1];
}
if(isset($col_array[2])) {
$coldx = $col_array[2];
}
else {
$coldx = 8.43;
}
if(isset($col_array[3])) {
$format = $col_array[3];
}
else {
$format = 0;
}
if(isset($col_array[4])) {
$grbit = $col_array[4];
}
else {
$grbit = 0;
}
$record = 0x007D; // Record identifier
$length = 0x000B; // Number of bytes to follow
$coldx += 0.72; // Fudge. Excel subtracts 0.72 !?
$coldx *= 256; // Convert to units of 1/256 of a char
$ixfe = $this->_XF($format);
$reserved = 0x00; // Reserved
$header = pack("vv", $record, $length);
$data = pack("vvvvvC", $colFirst, $colLast, $coldx,
$ixfe, $grbit, $reserved);
$this->_prepend($header.$data);
}
/**
* Write BIFF record SELECTION.
*
* @param array $array array containing ($rwFirst,$colFirst,$rwLast,$colLast)
* @see set_selection()
*/
function _store_selection($array)
{
list($rwFirst,$colFirst,$rwLast,$colLast) = $array;
$record = 0x001D; // Record identifier
$length = 0x000F; // Number of bytes to follow
$pnn = $this->_active_pane; // Pane position
$rwAct = $rwFirst; // Active row
$colAct = $colFirst; // Active column
$irefAct = 0; // Active cell ref
$cref = 1; // Number of refs
if (!isset($rwLast)) {
$rwLast = $rwFirst; // Last row in reference
}
if (!isset($colLast)) {
$colLast = $colFirst; // Last col in reference
}
// Swap last row/col for first row/col as necessary
if ($rwFirst > $rwLast)
{
list($rwFirst, $rwLast) = array($rwLast, $rwFirst);
}
if ($colFirst > $colLast)
{
list($colFirst, $colLast) = array($colLast, $colFirst);
}
$header = pack("vv", $record, $length);
$data = pack("CvvvvvvCC", $pnn, $rwAct, $colAct,
$irefAct, $cref,
$rwFirst, $rwLast,
$colFirst, $colLast);
$this->_append($header.$data);
}
/**
* Write BIFF record EXTERNCOUNT to indicate the number of external sheet
* references in a worksheet.
*
* Excel only stores references to external sheets that are used in formulas.
* For simplicity we store references to all the sheets in the workbook
* regardless of whether they are used or not. This reduces the overall
* complexity and eliminates the need for a two way dialogue between the formula
* parser the worksheet objects.
*
* @param integer $count The number of external sheet references in this worksheet
*/
function _store_externcount($count)
{
$record = 0x0016; // Record identifier
$length = 0x0002; // Number of bytes to follow
$header = pack("vv", $record, $length);
$data = pack("v", $count);
$this->_prepend($header.$data);
}
/**
* Writes the Excel BIFF EXTERNSHEET record. These references are used by
* formulas. A formula references a sheet name via an index. Since we store a
* reference to all of the external worksheets the EXTERNSHEET index is the same
* as the worksheet index.
*
* @param string $sheetname The name of a external worksheet
*/
function _store_externsheet($sheetname)
{
$record = 0x0017; // Record identifier
// References to the current sheet are encoded differently to references to
// external sheets.
//
if ($this->name == $sheetname) {
$sheetname = '';
$length = 0x02; // The following 2 bytes
$cch = 1; // The following byte
$rgch = 0x02; // Self reference
}
else {
$length = 0x02 + strlen($sheetname);
$cch = strlen($sheetname);
$rgch = 0x03; // Reference to a sheet in the current workbook
}
$header = pack("vv", $record, $length);
$data = pack("CC", $cch, $rgch);
$this->_prepend($header.$data.$sheetname);
}
/**
* Writes the Excel BIFF PANE record.
* The panes can either be frozen or thawed (unfrozen).
* Frozen panes are specified in terms of an integer number of rows and columns.
* Thawed panes are specified in terms of Excel's units for rows and columns.
*
* @param array $panes This is the only parameter received and is composed of the following:
* 0 => Vertical split position,
* 1 => Horizontal split position
* 2 => Top row visible
* 3 => Leftmost column visible
* 4 => Active pane
*/
function _store_panes($panes)
{
$y = $panes[0];
$x = $panes[1];
$rwTop = $panes[2];
$colLeft = $panes[3];
if(count($panes) > 4) { // if Active pane was received
$pnnAct = $panes[4];
}
else {
$pnnAct = NULL;
}
$record = 0x0041; // Record identifier
$length = 0x000A; // Number of bytes to follow
// Code specific to frozen or thawed panes.
if ($this->_frozen) {
// Set default values for $rwTop and $colLeft
if(!isset($rwTop)) {
$rwTop = $y;
}
if(!isset($colLeft)) {
$colLeft = $x;
}
}
else {
// Set default values for $rwTop and $colLeft
if(!isset($rwTop)) {
$rwTop = 0;
}
if(!isset($colLeft)) {
$colLeft = 0;
}
// Convert Excel's row and column units to the internal units.
// The default row height is 12.75
// The default column width is 8.43
// The following slope and intersection values were interpolated.
//
$y = 20*$y + 255;
$x = 113.879*$x + 390;
}
// Determine which pane should be active. There is also the undocumented
// option to override this should it be necessary: may be removed later.
//
if (!isset($pnnAct))
{
if ($x != 0 and $y != 0)
$pnnAct = 0; // Bottom right
if ($x != 0 and $y == 0)
$pnnAct = 1; // Top right
if ($x == 0 and $y != 0)
$pnnAct = 2; // Bottom left
if ($x == 0 and $y == 0)
$pnnAct = 3; // Top left
}
$this->_active_pane = $pnnAct; // Used in _store_selection
$header = pack("vv", $record, $length);
$data = pack("vvvvv", $x, $y, $rwTop, $colLeft, $pnnAct);
$this->_append($header.$data);
}
/**
* Store the page setup SETUP BIFF record.
*/
function _store_setup()
{
$record = 0x00A1; // Record identifier
$length = 0x0022; // Number of bytes to follow
$iPaperSize = $this->_paper_size; // Paper size
$iScale = $this->_print_scale; // Print scaling factor
$iPageStart = 0x01; // Starting page number
$iFitWidth = $this->_fit_width; // Fit to number of pages wide
$iFitHeight = $this->_fit_height; // Fit to number of pages high
$grbit = 0x00; // Option flags
$iRes = 0x0258; // Print resolution
$iVRes = 0x0258; // Vertical print resolution
$numHdr = $this->_margin_head; // Header Margin
$numFtr = $this->_margin_foot; // Footer Margin
$iCopies = 0x01; // Number of copies
$fLeftToRight = 0x0; // Print over then down
$fLandscape = $this->_orientation; // Page orientation
$fNoPls = 0x0; // Setup not read from printer
$fNoColor = 0x0; // Print black and white
$fDraft = 0x0; // Print draft quality
$fNotes = 0x0; // Print notes
$fNoOrient = 0x0; // Orientation not set
$fUsePage = 0x0; // Use custom starting page
$grbit = $fLeftToRight;
$grbit |= $fLandscape << 1;
$grbit |= $fNoPls << 2;
$grbit |= $fNoColor << 3;
$grbit |= $fDraft << 4;
$grbit |= $fNotes << 5;
$grbit |= $fNoOrient << 6;
$grbit |= $fUsePage << 7;
$numHdr = pack("d", $numHdr);
$numFtr = pack("d", $numFtr);
if ($this->_byte_order) // if it's Big Endian
{
$numHdr = strrev($numHdr);
$numFtr = strrev($numFtr);
}
$header = pack("vv", $record, $length);
$data1 = pack("vvvvvvvv", $iPaperSize,
$iScale,
$iPageStart,
$iFitWidth,
$iFitHeight,
$grbit,
$iRes,
$iVRes);
$data2 = $numHdr .$numFtr;
$data3 = pack("v", $iCopies);
$this->_prepend($header.$data1.$data2.$data3);
}
/**
* Store the header caption BIFF record.
*/
function store_header()
{
$record = 0x0014; // Record identifier
$str = $this->_header; // header string
$cch = strlen($str); // Length of header string
$length = 1 + $cch; // Bytes to follow
$header = pack("vv", $record, $length);
$data = pack("C", $cch);
$this->_append($header.$data.$str);
}
/**
* Store the footer caption BIFF record.
*/
function store_footer()
{
$record = 0x0015; // Record identifier
$str = $this->_footer; // Footer string
$cch = strlen($str); // Length of footer string
$length = 1 + $cch; // Bytes to follow
$header = pack("vv", $record, $length);
$data = pack("C", $cch);
$this->_append($header.$data.$str);
}
/**
* Store the horizontal centering HCENTER BIFF record.
*/
function store_hcenter()
{
$record = 0x0083; // Record identifier
$length = 0x0002; // Bytes to follow
$fHCenter = $this->_hcenter; // Horizontal centering
$header = pack("vv", $record, $length);
$data = pack("v", $fHCenter);
$this->_append($header.$data);
}
/**
* Store the vertical centering VCENTER BIFF record.
*/
function store_vcenter()
{
$record = 0x0084; // Record identifier
$length = 0x0002; // Bytes to follow
$fVCenter = $this->_vcenter; // Horizontal centering
$header = pack("vv", $record, $length);
$data = pack("v", $fVCenter);
$this->_append($header.$data);
}
/**
* Store the LEFTMARGIN BIFF record.
*/
function _store_margin_left()
{
$record = 0x0026; // Record identifier
$length = 0x0008; // Bytes to follow
$margin = $this->_margin_left; // Margin in inches
$header = pack("vv", $record, $length);
$data = pack("d", $margin);
if ($this->_byte_order) // if it's Big Endian
{
$data = strrev($data);
}
$this->_append($header.$data);
}
/**
* Store the RIGHTMARGIN BIFF record.
*/
function _store_margin_right()
{
$record = 0x0027; // Record identifier
$length = 0x0008; // Bytes to follow
$margin = $this->_margin_right; // Margin in inches
$header = pack("vv", $record, $length);
$data = pack("d", $margin);
if ($this->_byte_order) // if it's Big Endian
{
$data = strrev($data);
}
$this->_append($header.$data);
}
/**
* Store the TOPMARGIN BIFF record.
*/
function _store_margin_top()
{
$record = 0x0028; // Record identifier
$length = 0x0008; // Bytes to follow
$margin = $this->_margin_top; // Margin in inches
$header = pack("vv", $record, $length);
$data = pack("d", $margin);
if ($this->_byte_order) // if it's Big Endian
{
$data = strrev($data);
}
$this->_append($header.$data);
}
/**
* Store the BOTTOMMARGIN BIFF record.
*/
function _store_margin_bottom()
{
$record = 0x0029; // Record identifier
$length = 0x0008; // Bytes to follow
$margin = $this->_margin_bottom; // Margin in inches
$header = pack("vv", $record, $length);
$data = pack("d", $margin);
if ($this->_byte_order) // if it's Big Endian
{
$data = strrev($data);
}
$this->_append($header.$data);
}
/**
* This is an Excel97/2000 method. It is required to perform more complicated
* merging than the normal set_align('merge'). It merges the area given by
* its arguments.
*
* @access public
* @param integer $first_row First row of the area to merge
* @param integer $first_col First column of the area to merge
* @param integer $last_row Last row of the area to merge
* @param integer $last_col Last column of the area to merge
*/
function merge_cells($first_row, $first_col, $last_row, $last_col)
{
$record = 0x00E5; // Record identifier
$length = 0x000A; // Bytes to follow
$cref = 1; // Number of refs
// Swap last row/col for first row/col as necessary
if ($first_row > $last_row) {
list($first_row, $last_row) = array($last_row, $first_row);
}
if ($first_col > $last_col) {
list($first_col, $last_col) = array($last_col, $first_col);
}
$header = pack("vv", $record, $length);
$data = pack("vvvvv", $cref, $first_row, $last_row,
$first_col, $last_col);
$this->_append($header.$data);
}
/**
* Write the PRINTHEADERS BIFF record.
*/
function _store_print_headers()
{
$record = 0x002a; // Record identifier
$length = 0x0002; // Bytes to follow
$fPrintRwCol = $this->_print_headers; // Boolean flag
$header = pack("vv", $record, $length);
$data = pack("v", $fPrintRwCol);
$this->_prepend($header.$data);
}
/**
* Write the PRINTGRIDLINES BIFF record. Must be used in conjunction with the
* GRIDSET record.
*/
function _store_print_gridlines()
{
$record = 0x002b; // Record identifier
$length = 0x0002; // Bytes to follow
$fPrintGrid = $this->_print_gridlines; // Boolean flag
$header = pack("vv", $record, $length);
$data = pack("v", $fPrintGrid);
$this->_prepend($header.$data);
}
/**
* Write the GRIDSET BIFF record. Must be used in conjunction with the
* PRINTGRIDLINES record.
*/
function _store_gridset()
{
$record = 0x0082; // Record identifier
$length = 0x0002; // Bytes to follow
$fGridSet = !($this->_print_gridlines); // Boolean flag
$header = pack("vv", $record, $length);
$data = pack("v", $fGridSet);
$this->_prepend($header.$data);
}
/**
* Write the WSBOOL BIFF record, mainly for fit-to-page. Used in conjunction
* with the SETUP record.
*/
function _store_wsbool()
{
$record = 0x0081; // Record identifier
$length = 0x0002; // Bytes to follow
// The only option that is of interest is the flag for fit to page. So we
// set all the options in one go.
//
if ($this->_fit_page) {
$grbit = 0x05c1;
}
else {
$grbit = 0x04c1;
}
$header = pack("vv", $record, $length);
$data = pack("v", $grbit);
$this->_prepend($header.$data);
}
/**
* Write the HORIZONTALPAGEBREAKS BIFF record.
*/
function _store_hbreak()
{
// Return if the user hasn't specified pagebreaks
if(empty($this->_hbreaks)) {
return;
}
// Sort and filter array of page breaks
$breaks = $this->_hbreaks;
sort($breaks,SORT_NUMERIC);
if($breaks[0] == 0) { // don't use first break if it's 0
array_shift($breaks);
}
$record = 0x001b; // Record identifier
$cbrk = count($breaks); // Number of page breaks
$length = ($cbrk + 1) * 2; // Bytes to follow
$header = pack("vv", $record, $length);
$data = pack("v", $cbrk);
// Append each page break
foreach($breaks as $break) {
$data .= pack("v", $break);
}
$this->_prepend($header.$data);
}
/**
* Write the VERTICALPAGEBREAKS BIFF record.
*/
function _store_vbreak()
{
// Return if the user hasn't specified pagebreaks
if(empty($this->_vbreaks)) {
return;
}
// 1000 vertical pagebreaks appears to be an internal Excel 5 limit.
// It is slightly higher in Excel 97/200, approx. 1026
$breaks = array_slice($this->_vbreaks,0,1000);
// Sort and filter array of page breaks
sort($breaks,SORT_NUMERIC);
if($breaks[0] == 0) { // don't use first break if it's 0
array_shift($breaks);
}
$record = 0x001a; // Record identifier
$cbrk = count($breaks); // Number of page breaks
$length = ($cbrk + 1) * 2; // Bytes to follow
$header = pack("vv", $record, $length);
$data = pack("v", $cbrk);
// Append each page break
foreach ($breaks as $break) {
$data .= pack("v", $break);
}
$this->_prepend($header.$data);
}
/**
* Set the Biff PROTECT record to indicate that the worksheet is protected.
*/
function _store_protect()
{
// Exit unless sheet protection has been specified
if($this->_protect == 0) {
return;
}
$record = 0x0012; // Record identifier
$length = 0x0002; // Bytes to follow
$fLock = $this->_protect; // Worksheet is protected
$header = pack("vv", $record, $length);
$data = pack("v", $fLock);
$this->_prepend($header.$data);
}
/**
* Write the worksheet PASSWORD record.
*/
function _store_password()
{
// Exit unless sheet protection and password have been specified
if(($this->_protect == 0) or (!isset($this->_password))) {
return;
}
$record = 0x0013; // Record identifier
$length = 0x0002; // Bytes to follow
$wPassword = $this->_password; // Encoded password
$header = pack("vv", $record, $length);
$data = pack("v", $wPassword);
$this->_prepend($header.$data);
}
/**
* Insert a 24bit bitmap image in a worksheet. The main record required is
* IMDATA but it must be proceeded by a OBJ record to define its position.
*
* @access public
* @param integer $row The row we are going to insert the bitmap into
* @param integer $col The column we are going to insert the bitmap into
* @param string $bitmap The bitmap filename
* @param integer $x The horizontal position (offset) of the image inside the cell.
* @param integer $y The vertical position (offset) of the image inside the cell.
* @param integer $scale_x The horizontal scale
* @param integer $scale_y The vertical scale
*/
function insert_bitmap($row, $col, $bitmap, $x = 0, $y = 0, $scale_x = 1, $scale_y = 1)
{
list($width, $height, $size, $data) = $this->_process_bitmap($bitmap);
// Scale the frame of the image.
$width *= $scale_x;
$height *= $scale_y;
// Calculate the vertices of the image and write the OBJ record
$this->_position_image($col, $row, $x, $y, $width, $height);
// Write the IMDATA record to store the bitmap data
$record = 0x007f;
$length = 8 + $size;
$cf = 0x09;
$env = 0x01;
$lcb = $size;
$header = pack("vvvvV", $record, $length, $cf, $env, $lcb);
$this->_append($header.$data);
}
/**
* Calculate the vertices that define the position of the image as required by
* the OBJ record.
*
* +------------+------------+
* | A | B |
* +-----+------------+------------+
* | |(x1,y1) | |
* | 1 |(A1)._______|______ |
* | | | | |
* | | | | |
* +-----+----| BITMAP |-----+
* | | | | |
* | 2 | |______________. |
* | | | (B2)|
* | | | (x2,y2)|
* +---- +------------+------------+
*
* Example of a bitmap that covers some of the area from cell A1 to cell B2.
*
* Based on the width and height of the bitmap we need to calculate 8 vars:
* $col_start, $row_start, $col_end, $row_end, $x1, $y1, $x2, $y2.
* The width and height of the cells are also variable and have to be taken into
* account.
* The values of $col_start and $row_start are passed in from the calling
* function. The values of $col_end and $row_end are calculated by subtracting
* the width and height of the bitmap from the width and height of the
* underlying cells.
* The vertices are expressed as a percentage of the underlying cell width as
* follows (rhs values are in pixels):
*
* x1 = X / W *1024
* y1 = Y / H *256
* x2 = (X-1) / W *1024
* y2 = (Y-1) / H *256
*
* Where: X is distance from the left side of the underlying cell
* Y is distance from the top of the underlying cell
* W is the width of the cell
* H is the height of the cell
*
* @note the SDK incorrectly states that the height should be expressed as a
* percentage of 1024.
* @param integer $col_start Col containing upper left corner of object
* @param integer $row_start Row containing top left corner of object
* @param integer $x1 Distance to left side of object
* @param integer $y1 Distance to top of object
* @param integer $width Width of image frame
* @param integer $height Height of image frame
*/
function _position_image($col_start, $row_start, $x1, $y1, $width, $height)
{
// Initialise end cell to the same as the start cell
$col_end = $col_start; // Col containing lower right corner of object
$row_end = $row_start; // Row containing bottom right corner of object
// Zero the specified offset if greater than the cell dimensions
if ($x1 >= $this->size_col($col_start))
{
$x1 = 0;
}
if ($y1 >= $this->size_row($row_start))
{
$y1 = 0;
}
$width = $width + $x1 -1;
$height = $height + $y1 -1;
// Subtract the underlying cell widths to find the end cell of the image
while ($width >= $this->size_col($col_end)) {
$width -= $this->size_col($col_end);
$col_end++;
}
// Subtract the underlying cell heights to find the end cell of the image
while ($height >= $this->size_row($row_end)) {
$height -= $this->size_row($row_end);
$row_end++;
}
// Bitmap isn't allowed to start or finish in a hidden cell, i.e. a cell
// with zero eight or width.
//
if ($this->size_col($col_start) == 0)
return;
if ($this->size_col($col_end) == 0)
return;
if ($this->size_row($row_start) == 0)
return;
if ($this->size_row($row_end) == 0)
return;
// Convert the pixel values to the percentage value expected by Excel
$x1 = $x1 / $this->size_col($col_start) * 1024;
$y1 = $y1 / $this->size_row($row_start) * 256;
$x2 = $width / $this->size_col($col_end) * 1024; // Distance to right side of object
$y2 = $height / $this->size_row($row_end) * 256; // Distance to bottom of object
$this->_store_obj_picture( $col_start, $x1,
$row_start, $y1,
$col_end, $x2,
$row_end, $y2
);
}
/**
* Convert the width of a cell from user's units to pixels. By interpolation
* the relationship is: y = 7x +5. If the width hasn't been set by the user we
* use the default value. If the col is hidden we use a value of zero.
*
* @param integer $col The column
* @return integer The width in pixels
*/
function size_col($col)
{
// Look up the cell value to see if it has been changed
if (isset($this->col_sizes[$col])) {
if ($this->col_sizes[$col] == 0) {
return(0);
}
else {
return(floor(7 * $this->col_sizes[$col] + 5));
}
}
else {
return(64);
}
}
/**
* Convert the height of a cell from user's units to pixels. By interpolation
* the relationship is: y = 4/3x. If the height hasn't been set by the user we
* use the default value. If the row is hidden we use a value of zero. (Not
* possible to hide row yet).
*
* @param integer $row The row
* @return integer The width in pixels
*/
function size_row($row)
{
// Look up the cell value to see if it has been changed
if (isset($this->row_sizes[$row])) {
if ($this->row_sizes[$row] == 0) {
return(0);
}
else {
return(floor(4/3 * $this->row_sizes[$row]));
}
}
else {
return(17);
}
}
/**
* Store the OBJ record that precedes an IMDATA record. This could be generalise
* to support other Excel objects.
*
* @param integer $colL Column containing upper left corner of object
* @param integer $dxL Distance from left side of cell
* @param integer $rwT Row containing top left corner of object
* @param integer $dyT Distance from top of cell
* @param integer $colR Column containing lower right corner of object
* @param integer $dxR Distance from right of cell
* @param integer $rwB Row containing bottom right corner of object
* @param integer $dyB Distance from bottom of cell
*/
function _store_obj_picture($colL,$dxL,$rwT,$dyT,$colR,$dxR,$rwB,$dyB)
{
$record = 0x005d; // Record identifier
$length = 0x003c; // Bytes to follow
$cObj = 0x0001; // Count of objects in file (set to 1)
$OT = 0x0008; // Object type. 8 = Picture
$id = 0x0001; // Object ID
$grbit = 0x0614; // Option flags
$cbMacro = 0x0000; // Length of FMLA structure
$Reserved1 = 0x0000; // Reserved
$Reserved2 = 0x0000; // Reserved
$icvBack = 0x09; // Background colour
$icvFore = 0x09; // Foreground colour
$fls = 0x00; // Fill pattern
$fAuto = 0x00; // Automatic fill
$icv = 0x08; // Line colour
$lns = 0xff; // Line style
$lnw = 0x01; // Line weight
$fAutoB = 0x00; // Automatic border
$frs = 0x0000; // Frame style
$cf = 0x0009; // Image format, 9 = bitmap
$Reserved3 = 0x0000; // Reserved
$cbPictFmla = 0x0000; // Length of FMLA structure
$Reserved4 = 0x0000; // Reserved
$grbit2 = 0x0001; // Option flags
$Reserved5 = 0x0000; // Reserved
$header = pack("vv", $record, $length);
$data = pack("V", $cObj);
$data .= pack("v", $OT);
$data .= pack("v", $id);
$data .= pack("v", $grbit);
$data .= pack("v", $colL);
$data .= pack("v", $dxL);
$data .= pack("v", $rwT);
$data .= pack("v", $dyT);
$data .= pack("v", $colR);
$data .= pack("v", $dxR);
$data .= pack("v", $rwB);
$data .= pack("v", $dyB);
$data .= pack("v", $cbMacro);
$data .= pack("V", $Reserved1);
$data .= pack("v", $Reserved2);
$data .= pack("C", $icvBack);
$data .= pack("C", $icvFore);
$data .= pack("C", $fls);
$data .= pack("C", $fAuto);
$data .= pack("C", $icv);
$data .= pack("C", $lns);
$data .= pack("C", $lnw);
$data .= pack("C", $fAutoB);
$data .= pack("v", $frs);
$data .= pack("V", $cf);
$data .= pack("v", $Reserved3);
$data .= pack("v", $cbPictFmla);
$data .= pack("v", $Reserved4);
$data .= pack("v", $grbit2);
$data .= pack("V", $Reserved5);
$this->_append($header.$data);
}
/**
* Convert a 24 bit bitmap into the modified internal format used by Windows.
* This is described in BITMAPCOREHEADER and BITMAPCOREINFO structures in the
* MSDN library.
*
* @param string $bitmap The bitmap to process
* @return array Array with data and properties of the bitmap
*/
function _process_bitmap($bitmap)
{
// Open file.
$bmp_fd = fopen($bitmap,"rb");
if (!$bmp_fd) {
die("Couldn't import $bitmap");
}
// Slurp the file into a string.
$data = fread($bmp_fd, filesize($bitmap));
// Check that the file is big enough to be a bitmap.
if (strlen($data) <= 0x36) {
die("$bitmap doesn't contain enough data.\n");
}
// The first 2 bytes are used to identify the bitmap.
$identity = unpack("A2", $data);
if ($identity[''] != "BM") {
die("$bitmap doesn't appear to be a valid bitmap image.\n");
}
// Remove bitmap data: ID.
$data = substr($data, 2);
// Read and remove the bitmap size. This is more reliable than reading
// the data size at offset 0x22.
//
$size_array = unpack("V", substr($data, 0, 4));
$size = $size_array[''];
$data = substr($data, 4);
$size -= 0x36; // Subtract size of bitmap header.
$size += 0x0C; // Add size of BIFF header.
// Remove bitmap data: reserved, offset, header length.
$data = substr($data, 12);
// Read and remove the bitmap width and height. Verify the sizes.
$width_and_height = unpack("V2", substr($data, 0, 8));
$width = $width_and_height[1];
$height = $width_and_height[2];
$data = substr($data, 8);
if ($width > 0xFFFF) {
die("$bitmap: largest image width supported is 65k.\n");
}
if ($height > 0xFFFF) {
die("$bitmap: largest image height supported is 65k.\n");
}
// Read and remove the bitmap planes and bpp data. Verify them.
$planes_and_bitcount = unpack("v2", substr($data, 0, 4));
$data = substr($data, 4);
if ($planes_and_bitcount[2] != 24) { // Bitcount
die("$bitmap isn't a 24bit true color bitmap.\n");
}
if ($planes_and_bitcount[1] != 1) {
die("$bitmap: only 1 plane supported in bitmap image.\n");
}
// Read and remove the bitmap compression. Verify compression.
$compression = unpack("V", substr($data, 0, 4));
$data = substr($data, 4);
//$compression = 0;
if ($compression[""] != 0) {
die("$bitmap: compression not supported in bitmap image.\n");
}
// Remove bitmap data: data size, hres, vres, colours, imp. colours.
$data = substr($data, 20);
// Add the BITMAPCOREHEADER data
$header = pack("Vvvvv", 0x000c, $width, $height, 0x01, 0x18);
$data = $header . $data;
return (array($width, $height, $size, $data));
}
/**
* Store the window zoom factor. This should be a reduced fraction but for
* simplicity we will store all fractions with a numerator of 100.
*/
function _store_zoom()
{
// If scale is 100 we don't need to write a record
if ($this->_zoom == 100) {
return;
}
$record = 0x00A0; // Record identifier
$length = 0x0004; // Bytes to follow
$header = pack("vv", $record, $length);
$data = pack("vv", $this->_zoom, 100);
$this->_append($header.$data);
}
}
?>
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