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<?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) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: AsciiHex.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Zend_Pdf_Filter_Interface */
require_once 'Zend/Pdf/Filter/Interface.php';
/**
* AsciiHex stream filter
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Filter_AsciiHex implements Zend_Pdf_Filter_Interface
{
/**
* Encode data
*
* @param string $data
* @param array $params
* @return string
* @throws Zend_Pdf_Exception
*/
public static function encode($data, $params = null)
{
return bin2hex($data) . '>';
}
/**
* Decode data
*
* @param string $data
* @param array $params
* @return string
* @throws Zend_Pdf_Exception
*/
public static function decode($data, $params = null)
{
$output = '';
$oddCode = true;
$commentMode = false;
for ($count = 0; $count < strlen($data) && $data[$count] != '>'; $count++) {
$charCode = ord($data[$count]);
if ($commentMode) {
if ($charCode == 0x0A || $charCode == 0x0D ) {
$commentMode = false;
}
continue;
}
switch ($charCode) {
//Skip white space
case 0x00: // null character
// fall through to next case
case 0x09: // Tab
// fall through to next case
case 0x0A: // Line feed
// fall through to next case
case 0x0C: // Form Feed
// fall through to next case
case 0x0D: // Carriage return
// fall through to next case
case 0x20: // Space
// Do nothing
break;
case 0x25: // '%'
// Switch to comment mode
$commentMode = true;
break;
default:
if ($charCode >= 0x30 /*'0'*/ && $charCode <= 0x39 /*'9'*/) {
$code = $charCode - 0x30;
} else if ($charCode >= 0x41 /*'A'*/ && $charCode <= 0x46 /*'F'*/) {
$code = $charCode - 0x37/*0x41 - 0x0A*/;
} else if ($charCode >= 0x61 /*'a'*/ && $charCode <= 0x66 /*'f'*/) {
$code = $charCode - 0x57/*0x61 - 0x0A*/;
} else {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Wrong character in a encoded stream');
}
if ($oddCode) {
// Odd pass. Store hex digit for next pass
// Scope of $hexCodeHigh variable is whole function
$hexCodeHigh = $code;
} else {
// Even pass.
// Add decoded character to the output
// ($hexCodeHigh is stored in previous pass)
$output .= chr($hexCodeHigh*16 + $code);
}
$oddCode = !$oddCode;
break;
}
}
/* Check that stream is terminated by End Of Data marker */
if ($data[$count] != '>') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Wrong encoded stream End Of Data marker.');
}
/* Last '0' character is omitted */
if (!$oddCode) {
$output .= chr($hexCodeHigh*16);
}
return $output;
}
}
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