function QpEncoder::encodeString

Takes an unencoded string and produces a QP encoded string from it.

QP encoded strings have a maximum line length of 76 characters. If the first line needs to be shorter, indicate the difference with $firstLineOffset.

Overrides EncoderInterface::encodeString

2 calls to QpEncoder::encodeString()

QpMimeHeaderEncoder::encodeString in vendor/symfony/mime/Encoder/QpMimeHeaderEncoder.php

Takes an unencoded string and produces a QP encoded string from it.

QpMimeHeaderEncoder::encodeString in vendor/symfony/mime/Encoder/QpMimeHeaderEncoder.php

Takes an unencoded string and produces a QP encoded string from it.

1 method overrides QpEncoder::encodeString()

QpMimeHeaderEncoder::encodeString in vendor/symfony/mime/Encoder/QpMimeHeaderEncoder.php

Takes an unencoded string and produces a QP encoded string from it.

File

vendor/symfony/mime/Encoder/QpEncoder.php, line 115

Class

QpEncoder

@author Chris Corbyn

Namespace

Symfony\Component\Mime\Encoder

Code

public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0) : string {
    if ($maxLineLength > 76 || $maxLineLength <= 0) {
        $maxLineLength = 76;
    }
    $thisLineLength = $maxLineLength - $firstLineOffset;
    $lines = [];
    $lNo = 0;
    $lines[$lNo] = '';
    $currentLine =& $lines[$lNo++];
    $size = $lineLen = 0;
    $charStream = new CharacterStream($string, $charset);
    // Fetching more than 4 chars at one is slower, as is fetching fewer bytes
    // Conveniently 4 chars is the UTF-8 safe number since UTF-8 has up to 6
    // bytes per char and (6 * 4 * 3 = 72 chars per line) * =NN is 3 bytes
    while (null !== ($bytes = $charStream->readBytes(4))) {
        $enc = $this->encodeByteSequence($bytes, $size);
        $i = strpos($enc, '=0D=0A');
        $newLineLength = $lineLen + (false === $i ? $size : $i);
        if ($currentLine && $newLineLength >= $thisLineLength) {
            $lines[$lNo] = '';
            $currentLine =& $lines[$lNo++];
            $thisLineLength = $maxLineLength;
            $lineLen = 0;
        }
        $currentLine .= $enc;
        if (false === $i) {
            $lineLen += $size;
        }
        else {
            // 6 is the length of '=0D=0A'.
            $lineLen = $size - strrpos($enc, '=0D=0A') - 6;
        }
    }
    return $this->standardize(implode("=\r\n", $lines));
}