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gyro/core/lib/helpers/converters/mimeheader.converter.php

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<?php
/**
 * Converts text into mime encoded text
 * 
 * @attention supports encoding only!
 * 
 * @author Gerd Riesselmann
 * @ingroup Lib
 */
class ConverterMimeHeader implements IConverter {
        /**
         * ENcode. Takes optional charset as parameter 
         */
        public function encode($value, $params = false) {
                if (!$params) {
                        $params = GyroLocale::get_charset();
                }
                
                $ret = '';
                $requires_escaping = false;
                $l = strlen($value);
                // First check if there are characters that must be converted
                for ($i = 0; $i < $l; $i++) {
                        $c = ord(substr($value, $i, 1));
                        if ($c < 0x20 || $c > 0x7E) {
                                $requires_escaping = true;
                                break;
                        }
                }
                if ($requires_escaping) {
                        // Convert everything other then 0-9 and A-Z and a-z
                        for ($i = 0; $i < $l; $i++) {
                                $c = ord(substr($value, $i, 1));
                                if ($c == 0x20) {
                                        $c = '_'; // Space to _
                                }
                                elseif ( 
                                        ($c >= 0x30 && $c <= 0x39) || 
                                        ($c >= 0x41 && $c <= 0x5A) ||
                                        ($c >= 0x61 && $c <= 0x7A)
                                ) {
                                        $c = chr($c); // 0-9, a-z and A-Z stay the same
                                }
                                else {
                                        $c = '=' . strtoupper(dechex($c)); // Encode the rest
                                }
                                $ret .= $c;
                        }
                        $ret = '=?' . $params . '?Q?' . $ret . '?=';
                }
                else {
                        $ret = $value;
                }
                return $ret;                    
        }
        
        public function decode($value, $params = false) {
                return $value;          
        }       
} 

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