vda-5050-lib
Version:
Universal VDA 5050 library for Node.js and browsers
42 lines (41 loc) • 1.32 kB
JavaScript
;
/*! Copyright (c) 2021 Siemens AG. Licensed under the MIT License. */
Object.defineProperty(exports, "__esModule", { value: true });
exports.getUtf8BytesCount = exports.assertMqttTopicUtf8Count = exports.assertMqttTopicLength = void 0;
const MAX_MQTT_TOPIC_UTF8_COUNT = 65535;
function assertMqttTopicLength(mqttTopic) {
if (mqttTopic.length * 4 > MAX_MQTT_TOPIC_UTF8_COUNT) {
assertMqttTopicUtf8Count(getUtf8BytesCount(mqttTopic));
}
}
exports.assertMqttTopicLength = assertMqttTopicLength;
function assertMqttTopicUtf8Count(utf8Count) {
if (utf8Count > MAX_MQTT_TOPIC_UTF8_COUNT) {
throw new Error(`MQTT topic exceeds maximum allowed UTF-8 byte length`);
}
}
exports.assertMqttTopicUtf8Count = assertMqttTopicUtf8Count;
function getUtf8BytesCount(str) {
let count = 0;
const strLen = str.length;
for (let i = 0; i < strLen; i++) {
const code = str.charCodeAt(i);
if (code <= 0x007F) {
count++;
}
else if (code <= 0x07FF) {
count += 2;
}
else if (code <= 0xD7FF) {
count += 3;
}
else if (code <= 0xDFFF) {
count += 2;
}
else {
count += 3;
}
}
return count;
}
exports.getUtf8BytesCount = getUtf8BytesCount;