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Diffstat (limited to 'vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php')
-rw-r--r-- | vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php new file mode 100644 index 0000000..8f76d70 --- /dev/null +++ b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mime/ContentEncoder/Base64ContentEncoder.php @@ -0,0 +1,104 @@ +<?php + +/* + * This file is part of SwiftMailer. + * (c) 2004-2009 Chris Corbyn + * + * For the full copyright and license information, please view the LICENSE + * file that was distributed with this source code. + */ + +/** + * Handles Base 64 Transfer Encoding in Swift Mailer. + * + * @author Chris Corbyn + */ +class Swift_Mime_ContentEncoder_Base64ContentEncoder extends Swift_Encoder_Base64Encoder implements Swift_Mime_ContentEncoder +{ + /** + * Encode stream $in to stream $out. + * + * @param Swift_OutputByteStream $os + * @param Swift_InputByteStream $is + * @param int $firstLineOffset + * @param int $maxLineLength, optional, 0 indicates the default of 76 bytes + */ + public function encodeByteStream(Swift_OutputByteStream $os, Swift_InputByteStream $is, $firstLineOffset = 0, $maxLineLength = 0) + { + if (0 >= $maxLineLength || 76 < $maxLineLength) { + $maxLineLength = 76; + } + + $remainder = 0; + $base64ReadBufferRemainderBytes = null; + + // To reduce memory usage, the output buffer is streamed to the input buffer like so: + // Output Stream => base64encode => wrap line length => Input Stream + // HOWEVER it's important to note that base64_encode() should only be passed whole triplets of data (except for the final chunk of data) + // otherwise it will assume the input data has *ended* and it will incorrectly pad/terminate the base64 data mid-stream. + // We use $base64ReadBufferRemainderBytes to carry over 1-2 "remainder" bytes from the each chunk from OutputStream and pre-pend those onto the + // chunk of bytes read in the next iteration. + // When the OutputStream is empty, we must flush any remainder bytes. + while (true) { + $readBytes = $os->read(8192); + $atEOF = ($readBytes === false); + + if ($atEOF) { + $streamTheseBytes = $base64ReadBufferRemainderBytes; + } else { + $streamTheseBytes = $base64ReadBufferRemainderBytes.$readBytes; + } + $base64ReadBufferRemainderBytes = null; + $bytesLength = strlen($streamTheseBytes); + + if ($bytesLength === 0) { // no data left to encode + break; + } + + // if we're not on the last block of the ouput stream, make sure $streamTheseBytes ends with a complete triplet of data + // and carry over remainder 1-2 bytes to the next loop iteration + if (!$atEOF) { + $excessBytes = $bytesLength % 3; + if ($excessBytes !== 0) { + $base64ReadBufferRemainderBytes = substr($streamTheseBytes, -$excessBytes); + $streamTheseBytes = substr($streamTheseBytes, 0, $bytesLength - $excessBytes); + } + } + + $encoded = base64_encode($streamTheseBytes); + $encodedTransformed = ''; + $thisMaxLineLength = $maxLineLength - $remainder - $firstLineOffset; + + while ($thisMaxLineLength < strlen($encoded)) { + $encodedTransformed .= substr($encoded, 0, $thisMaxLineLength)."\r\n"; + $firstLineOffset = 0; + $encoded = substr($encoded, $thisMaxLineLength); + $thisMaxLineLength = $maxLineLength; + $remainder = 0; + } + + if (0 < $remainingLength = strlen($encoded)) { + $remainder += $remainingLength; + $encodedTransformed .= $encoded; + $encoded = null; + } + + $is->write($encodedTransformed); + + if ($atEOF) { + break; + } + } + } + + /** + * Get the name of this encoding scheme. + * Returns the string 'base64'. + * + * @return string + */ + public function getName() + { + return 'base64'; + } +} |