HeaderValue.php

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<?php
final class Zend_Mail_Header_HeaderValue
{
    private function __construct()
    {
    }

    public static function filter($value)
    {
        $result = '';
        $tot    = strlen($value);

        // Filter for CR and LF characters, leaving CRLF + WSP sequences for
        // Long Header Fields (section 2.2.3 of RFC 2822)
        for ($i = 0; $i < $tot; $i += 1) {
            $ord = ord($value[$i]);
            if (($ord < 32 || $ord > 126)
                && $ord !== 13
            ) {
                continue;
            }

            if ($ord === 13) {
                if ($i + 2 >= $tot) {
                    continue;
                }

                $lf = ord($value[$i + 1]);
                $sp = ord($value[$i + 2]);

                if ($lf !== 10 || $sp !== 32) {
                    continue;
                }

                $result .= "\r\n ";
                $i += 2;
                continue;
            }

            $result .= $value[$i];
        }

        return $result;
    }

    public static function isValid($value)
    {
        $tot = strlen($value);
        for ($i = 0; $i < $tot; $i += 1) {
            $ord = ord($value[$i]);
            if (($ord < 32 || $ord > 126)
                && $ord !== 13
            ) {
                return false;
            }

            if ($ord === 13) {
                if ($i + 2 >= $tot) {
                    return false;
                }

                $lf = ord($value[$i + 1]);
                $sp = ord($value[$i + 2]);

                if ($lf !== 10 || $sp !== 32) {
                    return false;
                }

                $i += 2;
            }
        }

        return true;
    }

    public static function assertValid($value)
    {
        if (! self::isValid($value)) {
            #require_once 'Zend/Mail/Exception.php';
            throw new Zend_Mail_Exception('Invalid header value detected');
        }
    }
}