//---------------------------------------------------------------
    function send_attachment_and_exit(&$attachment_data)
    {
        if (empty($attachment_data["indicator"])) {
            if (!empty($attachment_data["path"]) && !file_exists($attachment_data["path"])) {
                header("HTTP/1.1 404 Not Found");
                echo_html("404 " . text("ErrAttachmentNotFound"));
                exit();
            }

            if (empty($attachment_data["path"]) || !empty($attachment_data["deleted"])) {
                header('HTTP/1.0 403 Forbidden');
                echo_html("403 " . text("ErrAttachmentDeleted"));
                exit();
            }

            if (!empty($attachment_data["no_access"])) {
                header('HTTP/1.0 403 Forbidden');
                echo_html("403 " . text("ErrAttachmentNoAccess"));
                exit();
            }
        }

        $HTTP_IF_NONE_MATCH = val_or_empty($_SERVER['HTTP_IF_NONE_MATCH']);

        $headers = apache_request_headers();

        foreach ($headers as $header => $value) {
            if (strcasecmp('If-None-Match', $header) == 0 && !empty($value)) {
                $HTTP_IF_NONE_MATCH = $value;
            }
        }

        $modified = filectime($attachment_data["path"]);
        $etag = System::generateHash(str_replace(APPLICATION_ROOT, "", $attachment_data["path"]) . "-" . $modified . "-" . val_or_empty($attachment_data["deleted"]), SALT_KEY);
        if ($HTTP_IF_NONE_MATCH == $etag) {
            header("HTTP/1.1 304 Not Modified");

            exit();
        }

        header("Cache-Control: no-cache");

        $filesize = sprintf("%u", filesize($attachment_data["path"]));

        $range = false;

        if (isset($_SERVER['HTTP_RANGE'])) {
            $range = $_SERVER['HTTP_RANGE'];
        } elseif ($apache = apache_request_headers()) {
            $headers = array();
            foreach ($apache as $header => $val) {
                $headers[strtolower($header)] = $val;
            }
            if (isset($headers['range'])) {
                $range = $headers['range'];
            }
        }

        $length = $filesize;
        $partial = false;
        if ($range) {
            $partial = true;
            list($param, $range) = explode('=', $range);

            // Bad request - range unit is not 'bytes'
            if (strtolower(trim($param)) != 'bytes') {
                header("HTTP/1.1 400 Invalid Request");
                exit;
            }

            // Get range values
            $range = explode(',', $range);
            $range = explode('-', $range[0]);

            // Deal with range values
            if ($range[0] === '') {
                $end = $filesize - 1;
                $start = $end - intval($range[0]);
                $length = $end - $start + 1;
            } elseif ($range[1] === '') {
                $start = intval($range[0]);
                $end = $filesize - 1;
                $length = $end - $start + 1;
            } else {
                // Both numbers present, return specific range
                $start = intval($range[0]);
                $end = intval($range[1]);
                if ($end >= $filesize || (!$start && (!$end || $end == ($filesize - 1)))) {
                    $partial = false; // Invalid range/whole file specified, return whole file
                    $length = $filesize;
                } else {
                    $length = $end - $start + 1;
                }
            }
        }

        if (!$partial) {
            header("Etag: $etag");
        }

        header('Accept-Ranges: bytes');

        if (preg_match("/image.+/", $attachment_data["type"])) {
            header("Content-type: " . $attachment_data["type"]);
            header("Content-Disposition: inline; filename=\"$attachment_data[name]\"");
        } elseif (preg_match("/.*(audio\\/mpeg|audio\\/ogg|video\\/mp4|video\\/webm|video\\/ogg).*/", $attachment_data["type"])) {
            header("Content-type: " . $attachment_data["type"]);
            header("Content-Disposition: inline; filename=\"$attachment_data[name]\"");
        } elseif (preg_match("/.*(application\\/pdf).*/", $attachment_data["type"])) {
            header("Content-type: " . $attachment_data["type"]);
            header("Content-Disposition: inline; filename=\"$attachment_data[name]\"");
        } else {
            header("Content-type: " . $attachment_data["type"]);
            header("Content-Disposition: attachment; filename=\"$attachment_data[name]\"");
        }

        if ($partial) {
            header('HTTP/1.1 206 Partial Content');
            header("Content-Length: $length");
            header("Content-Range: bytes $start-$end/$filesize");
            if (!$fp = fopen($attachment_data["path"], 'rb')) {
                header("HTTP/1.1 500 Internal Server Error");
                exit();
            }

            if ($start) {
                fseek($fp, $start);
            }

            while ($length) {
                set_time_limit(0);
                $read = ($length > 65536) ? 65536 : $length;
                $length -= $read;
                if ($read > 0) {
                    print(fread($fp, $read));
                }
            }

            fclose($fp);
        } else {
            header("Content-Length: $length");
            readfile($attachment_data["path"]);
        }

        exit();
    } // send_attachment_and_exit