/framework/vendor/zend/Zend/Pdf/Filter/Ascii85.php
http://zoop.googlecode.com/ · PHP · 181 lines · 91 code · 32 blank · 58 comment · 18 complexity · 1f16d049fa2b4df656813b9e493b236e MD5 · raw file
- <?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 20096 2010-01-06 02:05:09Z bkarwin $
- */
- /** 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 .= chr(0);
- }
- $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);
- next;
- }
- $c = substr($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;
- }
- }