Function writeLength

map-chat/javascript/browserMqtt.js:1926–1940

* writeLength - write an MQTT style length field to the buffer * * @param buffer - destination * @param pos - offset * @param length - length (>0) * @returns number of bytes written * * @api private

(buffer, pos, length)

 */

function writeLength(buffer, pos, length) {
  var digit = 0
    , origPos = pos

  do {
    digit = length % 128 | 0
    length = length / 128 | 0
    if (length > 0) {
        digit = digit | 0x80
    }
    buffer.writeUInt8(digit, pos++)
  } while (length > 0)

  return pos - origPos
}

/**
 * writeString - write a utf8 string to the buffer