186 lines
4.5 KiB
PHP
186 lines
4.5 KiB
PHP
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<?php
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/*
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A plain text transfer encoder in Swift Mailer.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//@require 'Swift/Mime/ContentEncoder.php';
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//@require 'Swift/InputByteStream.php';
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//@require 'Swift/OutputByteStream.php';
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/**
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* Handles binary/7/8-bit Transfer Encoding in Swift Mailer.
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* @package Swift
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* @subpackage Mime
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* @author Chris Corbyn
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*/
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class Swift_Mime_ContentEncoder_PlainContentEncoder
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implements Swift_Mime_ContentEncoder
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{
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/**
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* The name of this encoding scheme (probably 7bit or 8bit).
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* @var string
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* @access private
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*/
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private $_name;
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/**
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* True if canonical transformations should be done.
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* @var boolean
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* @access private
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*/
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private $_canonical;
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/**
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* Creates a new PlainContentEncoder with $name (probably 7bit or 8bit).
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* @param string $name
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* @param boolean $canonical If canonicalization transformation should be done.
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*/
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public function __construct($name, $canonical = false)
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{
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$this->_name = $name;
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$this->_canonical = $canonical;
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}
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/**
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* Encode a given string to produce an encoded string.
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* @param string $string
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* @param int $firstLineOffset, ignored
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* @param int $maxLineLength - 0 means no wrapping will occur
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* @return string
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*/
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public function encodeString($string, $firstLineOffset = 0,
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$maxLineLength = 0)
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{
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if ($this->_canonical)
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{
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$string = $this->_canonicalize($string);
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}
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return $this->_safeWordWrap($string, $maxLineLength, "\r\n");
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}
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/**
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* Encode stream $in to stream $out.
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* @param Swift_OutputByteStream $in
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* @param Swift_InputByteStream $out
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* @param int $firstLineOffset, ignored
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* @param int $maxLineLength, optional, 0 means no wrapping will occur
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*/
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public function encodeByteStream(
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Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0,
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$maxLineLength = 0)
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{
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$leftOver = '';
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while (false !== $bytes = $os->read(8192))
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{
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$toencode = $leftOver . $bytes;
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if ($this->_canonical)
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{
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$toencode = $this->_canonicalize($toencode);
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}
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$wrapped = $this->_safeWordWrap($toencode, $maxLineLength, "\r\n");
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$lastLinePos = strrpos($wrapped, "\r\n");
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$leftOver = substr($wrapped, $lastLinePos);
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$wrapped = substr($wrapped, 0, $lastLinePos);
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$is->write($wrapped);
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}
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if (strlen($leftOver))
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{
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$is->write($leftOver);
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}
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}
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/**
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* Get the name of this encoding scheme.
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* @return string
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*/
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public function getName()
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{
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return $this->_name;
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}
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/**
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* Not used.
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*/
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public function charsetChanged($charset)
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{
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}
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// -- Private methods
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/**
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* A safer (but weaker) wordwrap for unicode.
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* @param string $string
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* @param int $length
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* @param string $le
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* @return string
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* @access private
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*/
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private function _safeWordwrap($string, $length = 75, $le = "\r\n")
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{
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if (0 >= $length)
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{
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return $string;
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}
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$originalLines = explode($le, $string);
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$lines = array();
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$lineCount = 0;
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foreach ($originalLines as $originalLine)
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{
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$lines[] = '';
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$currentLine =& $lines[$lineCount++];
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//$chunks = preg_split('/(?<=[\ \t,\.!\?\-&\+\/])/', $originalLine);
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$chunks = preg_split('/(?<=\s)/', $originalLine);
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foreach ($chunks as $chunk)
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{
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if (0 != strlen($currentLine)
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&& strlen($currentLine . $chunk) > $length)
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{
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$lines[] = '';
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$currentLine =& $lines[$lineCount++];
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}
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$currentLine .= $chunk;
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}
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}
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return implode("\r\n", $lines);
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}
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/**
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* Canonicalize string input (fix CRLF).
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* @param string $string
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* @return string
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* @access private
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*/
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private function _canonicalize($string)
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{
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return str_replace(
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array("\r\n", "\r", "\n"),
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array("\n", "\n", "\r\n"),
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$string
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);
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}
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}
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