1: <?php
  2: 
  3: /*
  4:  * This file is part of SwiftMailer.
  5:  * (c) 2004-2009 Chris Corbyn
  6:  *
  7:  * For the full copyright and license information, please view the LICENSE
  8:  * file that was distributed with this source code.
  9:  */
 10: 
 11: /**
 12:  * Handles binary/7/8-bit Transfer Encoding in Swift Mailer.
 13:  * @package Swift
 14:  * @subpackage Mime
 15:  * @author Chris Corbyn
 16:  */
 17: class Swift_Mime_ContentEncoder_PlainContentEncoder implements Swift_Mime_ContentEncoder
 18: {
 19:     /**
 20:      * The name of this encoding scheme (probably 7bit or 8bit).
 21:      * @var string
 22:      * @access private
 23:      */
 24:     private $_name;
 25: 
 26:     /**
 27:      * True if canonical transformations should be done.
 28:      * @var boolean
 29:      * @access private
 30:      */
 31:     private $_canonical;
 32: 
 33:     /**
 34:      * Creates a new PlainContentEncoder with $name (probably 7bit or 8bit).
 35:      * @param string  $name
 36:      * @param boolean $canonical If canonicalization transformation should be done.
 37:      */
 38:     public function __construct($name, $canonical = false)
 39:     {
 40:         $this->_name = $name;
 41:         $this->_canonical = $canonical;
 42:     }
 43: 
 44:     /**
 45:      * Encode a given string to produce an encoded string.
 46:      * @param  string $string
 47:      * @param  int    $firstLineOffset, ignored
 48:      * @param  int    $maxLineLength    - 0 means no wrapping will occur
 49:      * @return string
 50:      */
 51:     public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
 52:     {
 53:         if ($this->_canonical) {
 54:             $string = $this->_canonicalize($string);
 55:         }
 56: 
 57:         return $this->_safeWordWrap($string, $maxLineLength, "\r\n");
 58:     }
 59: 
 60:     /**
 61:      * Encode stream $in to stream $out.
 62:      * @param Swift_OutputByteStream $in
 63:      * @param Swift_InputByteStream  $out
 64:      * @param int                    $firstLineOffset, ignored
 65:      * @param int                    $maxLineLength,   optional, 0 means no wrapping will occur
 66:      */
 67:     public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
 68:     {
 69:         $leftOver = '';
 70:         while (false !== $bytes = $os->read(8192)) {
 71:             $toencode = $leftOver . $bytes;
 72:             if ($this->_canonical) {
 73:                 $toencode = $this->_canonicalize($toencode);
 74:             }
 75:             $wrapped = $this->_safeWordWrap($toencode, $maxLineLength, "\r\n");
 76:             $lastLinePos = strrpos($wrapped, "\r\n");
 77:             $leftOver = substr($wrapped, $lastLinePos);
 78:             $wrapped = substr($wrapped, 0, $lastLinePos);
 79: 
 80:             $is->write($wrapped);
 81:         }
 82:         if (strlen($leftOver)) {
 83:             $is->write($leftOver);
 84:         }
 85:     }
 86: 
 87:     /**
 88:      * Get the name of this encoding scheme.
 89:      * @return string
 90:      */
 91:     public function getName()
 92:     {
 93:         return $this->_name;
 94:     }
 95: 
 96:     /**
 97:      * Not used.
 98:      */
 99:     public function charsetChanged($charset)
100:     {
101:     }
102: 
103:     // -- Private methods
104: 
105:     /**
106:      * A safer (but weaker) wordwrap for unicode.
107:      * @param  string $string
108:      * @param  int    $length
109:      * @param  string $le
110:      * @return string
111:      * @access private
112:      */
113:     private function _safeWordwrap($string, $length = 75, $le = "\r\n")
114:     {
115:         if (0 >= $length) {
116:             return $string;
117:         }
118: 
119:         $originalLines = explode($le, $string);
120: 
121:         $lines = array();
122:         $lineCount = 0;
123: 
124:         foreach ($originalLines as $originalLine) {
125:             $lines[] = '';
126:             $currentLine =& $lines[$lineCount++];
127: 
128:             //$chunks = preg_split('/(?<=[\ \t,\.!\?\-&\+\/])/', $originalLine);
129:             $chunks = preg_split('/(?<=\s)/', $originalLine);
130: 
131:             foreach ($chunks as $chunk) {
132:                 if (0 != strlen($currentLine)
133:                     && strlen($currentLine . $chunk) > $length)
134:                 {
135:                     $lines[] = '';
136:                     $currentLine =& $lines[$lineCount++];
137:                 }
138:                 $currentLine .= $chunk;
139:             }
140:         }
141: 
142:         return implode("\r\n", $lines);
143:     }
144: 
145:     /**
146:      * Canonicalize string input (fix CRLF).
147:      * @param  string $string
148:      * @return string
149:      * @access private
150:      */
151:     private function _canonicalize($string)
152:     {
153:         return str_replace(
154:             array("\r\n", "\r", "\n"),
155:             array("\n", "\n", "\r\n"),
156:             $string
157:             );
158:     }
159: }
160: