Файл: library/Zend/Pdf/Filter/Ascii85.php
Строк: 140
<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Ascii85.php 22653 2010-07-22 18:41:39Z mabe $
*/
/** Zend_Pdf_Filter_Interface */
require_once 'Zend/Pdf/Filter/Interface.php';
/**
* ASCII85 stream filter
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Filter_Ascii85 implements Zend_Pdf_Filter_Interface
{
/**
* Encode data
*
* @param string $data
* @param array $params
* @return string
* @throws Zend_Pdf_Exception
*/
public static function encode($data, $params = null)
{
$output = '';
$dataLength = strlen($data);
for ($i = 0; $i < $dataLength; $i += 4) {
//convert the 4 characters into a 32-bit number
$chunk = substr($data, $i, 4);
if (strlen($chunk) < 4) {
//partial chunk
break;
}
$b = unpack("N", $chunk);
$b = $b[1];
//special char for all 4 bytes = 0
if ($b == 0) {
$output .= 'z';
continue;
}
//encode into 5 bytes
for ($j = 4; $j >= 0; $j--) {
$foo = (int) (($b / pow(85,$j)) + 33);
$b %= pow(85,$j);
$output .= chr($foo);
}
}
//encode partial chunk
if ($i < $dataLength) {
$n = $dataLength - $i;
$chunk = substr($data, -$n);
//0 pad the rest
for ($j = $n;$j < 4;$j++) {
$chunk .= " ";
}
$b = unpack("N", $chunk);
$b = $b[1];
//encode just $n + 1
for ($j = 4; $j >= (4 - $n); $j--) {
$foo = (int) (($b / pow(85,$j)) + 33);
$b %= pow(85,$j);
$output .= chr($foo);
}
}
//EOD
$output .= '~>';
//make sure lines are split
$output = chunk_split($output, 76, "n");
//get rid of new line at the end
$output = substr($output, 0, -1);
return $output;
}
/**
* Decode data
*
* @param string $data
* @param array $params
* @return string
* @throws Zend_Pdf_Exception
*/
public static function decode($data, $params = null)
{
$output = '';
//get rid of the whitespaces
$whiteSpace = array("x00", "x09", "x0A", "x0C", "x0D", "x20");
$data = str_replace($whiteSpace, '', $data);
if (substr($data, -2) != '~>') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Invalid EOF marker');
return '';
}
$data = substr($data, 0, (strlen($data) - 2));
$dataLength = strlen($data);
for ($i = 0; $i < $dataLength; $i += 5) {
$b = 0;
if (substr($data, $i, 1) == "z") {
$i -= 4;
$output .= pack("N", 0);
continue;
}
$c = substr($data, $i, 5);
if(strlen($c) < 5) {
//partial chunk
break;
}
$c = unpack('C5', $c);
$value = 0;
for ($j = 1; $j <= 5; $j++) {
$value += (($c[$j] - 33) * pow(85, (5 - $j)));
}
$output .= pack("N", $value);
}
//decode partial
if ($i < $dataLength) {
$value = 0;
$chunk = substr($data, $i);
$partialLength = strlen($chunk);
//pad the rest of the chunk with u's
//until the lenght of the chunk is 5
for ($j = 0; $j < (5 - $partialLength); $j++) {
$chunk .= 'u';
}
$c = unpack('C5', $chunk);
for ($j = 1; $j <= 5; $j++) {
$value += (($c[$j] - 33) * pow(85, (5 - $j)));
}
$foo = pack("N", $value);
$output .= substr($foo, 0, ($partialLength - 1));
}
return $output;
}
}