122 lines
3.3 KiB
PHP
122 lines
3.3 KiB
PHP
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<?php
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/*
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* This file is part of SwiftMailer.
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* (c) 2004-2009 Chris Corbyn
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Handles Quoted Printable (QP) Transfer Encoding in Swift Mailer using the PHP core function.
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*
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* @author Lars Strojny
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*/
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class Swift_Mime_ContentEncoder_NativeQpContentEncoder implements Swift_Mime_ContentEncoder
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{
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/**
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* @var string|null
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*/
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private $charset;
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/**
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* @param string|null $charset
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*/
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public function __construct($charset = null)
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{
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$this->charset = $charset ?: 'utf-8';
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}
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/**
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* Notify this observer that the entity's charset has changed.
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*
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* @param string $charset
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*/
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public function charsetChanged($charset)
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{
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$this->charset = $charset;
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}
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/**
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* Encode $in to $out.
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*
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* @param Swift_OutputByteStream $os to read from
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* @param Swift_InputByteStream $is to write to
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* @param int $firstLineOffset
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* @param int $maxLineLength 0 indicates the default length for this encoding
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*
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* @throws RuntimeException
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*/
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public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0)
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{
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if ('utf-8' !== $this->charset) {
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throw new RuntimeException(sprintf('Charset "%s" not supported. NativeQpContentEncoder only supports "utf-8"', $this->charset));
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}
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$string = '';
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while (false !== $bytes = $os->read(8192)) {
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$string .= $bytes;
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}
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$is->write($this->encodeString($string));
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}
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/**
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* Get the MIME name of this content encoding scheme.
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*
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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 'quoted-printable';
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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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*
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* @param string $string
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* @param int $firstLineOffset if first line needs to be shorter
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* @param int $maxLineLength 0 indicates the default length for this encoding
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*
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* @throws RuntimeException
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*
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* @return string
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*/
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public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
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{
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if ('utf-8' !== $this->charset) {
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throw new RuntimeException(sprintf('Charset "%s" not supported. NativeQpContentEncoder only supports "utf-8"', $this->charset));
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}
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return $this->standardize(quoted_printable_encode($string));
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}
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/**
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* Make sure CRLF is correct and HT/SPACE are in valid places.
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*
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* @param string $string
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*
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* @return string
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*/
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protected function standardize($string)
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{
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// transform CR or LF to CRLF
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$string = preg_replace('~=0D(?!=0A)|(?<!=0D)=0A~', '=0D=0A', $string);
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// transform =0D=0A to CRLF
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$string = str_replace(["\t=0D=0A", ' =0D=0A', '=0D=0A'], ["=09\r\n", "=20\r\n", "\r\n"], $string);
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switch (\ord(substr($string, -1))) {
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case 0x09:
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$string = substr_replace($string, '=09', -1);
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break;
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case 0x20:
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$string = substr_replace($string, '=20', -1);
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break;
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}
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return $string;
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}
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}
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