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|
<?php
/**
* @version 1.4.0
* @package RSform!Pro 1.4.0
* @copyright (C) 2007-2013 www.rsjoomla.com
* @license GPL, http://www.gnu.org/copyleft/gpl.html
*/
defined('_JEXEC') or die('Restricted access');
class RSFormProXLS
{
/* private */
var $position = 0; // stream pointer
var $mode = "rb"; // default stream open mode
var $xlsfilename = null; // stream name
var $fp = null; // internal stream pointer to physical file
var $buffer = null; // internal write buffer
var $endian = "unknown"; // little | unknown | big endian mode
var $bin = array(
"big" => "v",
"little" => "s",
"unknown" => "s",
);
var $start_row = 0;
var $end_row = 0;
var $use_headers = 0;
/**
* detect server endian mode
* thanks to Charles Turner for picking this one up
* @access private
* @params void
* @returns void
* @see http://www.phpdig.net/ref/rn45re877.html
*/
function _detect()
{
// A hex number that may represent 'abyz'
$abyz = 0x6162797A;
// Convert $abyz to a binary string containing 32 bits
// Do the conversion the way that the system architecture wants to
switch (pack ('L', $abyz))
{
// Compare the value to the same value converted in a Little-Endian fashion
case pack ('V', $abyz):
$this->endian = "little";
break;
// Compare the value to the same value converted in a Big-Endian fashion
case pack ('N', $abyz):
$this->endian = "big";
break;
default:
$this->endian = "unknown";
break;
}
}
/**
* called by fopen() to the stream
* @param (string) $path file path
* @param (string) $mode stream open mode
* @param (int) $options stream options (STREAM_USE_PATH |
* STREAM_REPORT_ERRORS)
* @param (string) $opened_path stream opened path
*/
function open($path, $mode, $start_row=0)
{
$this->xlsfilename = $path;
$this->position = 0;
$this->mode = $mode;
$this->_detect(); // detect endian mode
//@TODO: test for invalid mode and trigger error if required
// open underlying resource
$this->fp = @fopen($this->xlsfilename, $this->mode);
if (is_resource($this->fp))
{
// empty the buffer
$this->buffer = "";
if (preg_match("/^w|x/", $this->mode))
{
// write an Excel stream header
$str = pack(str_repeat($this->bin[$this->endian], 6), 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);
fwrite($this->fp, $str);
$this->position = strlen($str);
}
if (preg_match("/a/", $this->mode))
{
$this->position = filesize($this->xlsfilename);
$this->start_row = (int) $start_row;
}
if ($this->use_headers)
$this->start_row += 1;
}
return is_resource($this->fp);
}
/**
* read the underlying stream resource (automatically called by fread/fgets)
* @todo modify this to convert an excel stream to an array
* @param (int) $byte_count number of bytes to read (in 8192 byte blocks)
*/
function read($byte_count)
{
if (is_resource($this->fp) && !feof($this->fp))
{
$data .= fread($this->fp, $byte_count);
$this->position = strlen($data);
}
return $data;
}
/**
* called automatically by an fwrite() to the stream
* @param (string) $data serialized array data string
* representing a tabular worksheet
*/
function write($data)
{
if (is_array($data))
$data = serialize($data);
// buffer the data
$this->buffer .= $data;
$bufsize = strlen($data);
return $bufsize;
}
function write_headers($_data)
{
$row = 0;
// write the column headers only if we are not appending
if (preg_match("/^w|x/", $this->mode))
{
// write the column headers
foreach (array_values($_data) as $col => $val)
{
// next line intentionally commented out
// since we don't want a warning about the
// extra bytes written
// $size += $this->write($row, $col, $val);
$this->_xlsWriteCell($row, $col, $val);
}
return true;
}
return false;
}
/**
* pseudo write function to manipulate the data
* stream before writing it
* modify this to suit your data array
* @access private
* @param (array) $data associative array representing
* a tabular worksheet
*/
function _xls_stream_write($data)
{
$size = 0;
if (is_array($data) && !empty($data))
{
$row = $this->start_row;
foreach (array_values($data) as $_data)
{
if (is_array($_data) && !empty($_data))
{
foreach (array_values($_data) as $col => $val)
{
$size += $this->_xlsWriteCell($row, $col, $val);
}
$row++;
}
}
$this->end_row = $row;
}
return $size;
}
/**
* Excel worksheet cell insertion
* (single-worksheet supported only)
* @access private
* @param (int) $row worksheet row number (0...65536)
* @param (int) $col worksheet column number (0..255)
* @param (mixed) $val worksheet row number
*/
function _xlsWriteCell($row, $col, $val)
{
if (is_float($val) || is_int($val))
{
// doubles, floats, integers
$str = pack(str_repeat($this->bin[$this->endian], 5), 0x203, 14, $row, $col, 0x0);
$str .= pack("d", $val);
}
else
{
$val = utf8_decode($val);
// everything else is treated as a string
$l = strlen($val);
$str = pack(str_repeat($this->bin[$this->endian], 6), 0x204, 8 + $l, $row, $col, 0x0, $l);
$str .= $val;
}
fwrite($this->fp, $str);
$this->position += strlen($str);
return strlen($str);
}
/**
* called by an fclose() on the stream
*/
function close()
{
$was_empty = empty($this->buffer);
// flush the buffer
$bufsize = $this->_xls_stream_write(unserialize($this->buffer));
// ...and empty it
$this->buffer = null;
// write the buffer when we are appending and the buffer is empty
// this should be the last step
if (preg_match("/a/", $this->mode) && $was_empty)
{
// write the xls EOF
$str = pack(str_repeat($this->bin[$this->endian], 2), 0x0A, 0x00);
$this->position += strlen($str);
fwrite($this->fp, $str);
}
// ...and close the internal stream
return fclose($this->fp);
}
function eof()
{
$eof = true;
if (is_resource($this->fp))
{
$eof = feof($this->fp);
}
return $eof;
}
}
?> |
