91 lines
2.3 KiB
PHP
91 lines
2.3 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 RFC 2231 specified Encoding in Swift Mailer.
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*
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* @author Chris Corbyn
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*/
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class Swift_Encoder_Rfc2231Encoder implements Swift_Encoder
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{
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/**
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* A character stream to use when reading a string as characters instead of bytes.
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*
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* @var Swift_CharacterStream
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*/
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private $charStream;
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/**
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* Creates a new Rfc2231Encoder using the given character stream instance.
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*/
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public function __construct(Swift_CharacterStream $charStream)
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{
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$this->charStream = $charStream;
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}
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/**
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* Takes an unencoded string and produces a string encoded according to
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* RFC 2231 from it.
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*
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* @param string $string
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* @param int $firstLineOffset
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* @param int $maxLineLength optional, 0 indicates the default of 75 bytes
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*
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* @return string
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*/
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public function encodeString($string, $firstLineOffset = 0, $maxLineLength = 0)
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{
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$lines = [];
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$lineCount = 0;
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$lines[] = '';
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$currentLine = &$lines[$lineCount++];
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if (0 >= $maxLineLength) {
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$maxLineLength = 75;
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}
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$this->charStream->flushContents();
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$this->charStream->importString($string);
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$thisLineLength = $maxLineLength - $firstLineOffset;
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while (false !== $char = $this->charStream->read(4)) {
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$encodedChar = rawurlencode($char);
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if (0 != \strlen($currentLine)
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&& \strlen($currentLine.$encodedChar) > $thisLineLength) {
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$lines[] = '';
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$currentLine = &$lines[$lineCount++];
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$thisLineLength = $maxLineLength;
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}
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$currentLine .= $encodedChar;
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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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* Updates the charset used.
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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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$this->charStream->setCharacterSet($charset);
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}
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/**
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* Make a deep copy of object.
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*/
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public function __clone()
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{
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$this->charStream = clone $this->charStream;
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}
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}
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