Function parse

app/rcc/scripts/parser/js/rtcm_corrections.js:187–229

* Parses an RTCM3 message frame into the predefined array structure. * * RTCM3 frame structure: * Byte 0: Preamble (0xD3) * Bytes 1-2: Reserved (6 bits) + Message length (10 bits) * Bytes 3-n: Message payload * Bytes n+1-n+3: CRC-24Q checksum * * Message payload struct

(frame)

 * @returns {array} Array of values mapped according to messageTypeMap
 */
function parse(frame) {
  if (frame.length < 6)
    return parsedValues;

  if (frame[0] !== 0xD3) {
    console.error("Invalid RTCM3 preamble");
    return parsedValues;
  }

  var msgLength = ((frame[1] & 0x03) << 8) | frame[2];

  if (frame.length < 3 + msgLength + 3) {
    console.error("Incomplete RTCM3 frame");
    return parsedValues;
  }

  if (!validateCRC24(frame)) {
    console.error("RTCM3 CRC validation failed");
    return parsedValues;
  }

  var payload = [];
  for (var i = 3; i < 3 + msgLength; i++)
    payload.push(frame[i]);

  var messageType = readBits(payload, 0, 12);

  if (!messageTypeMap.hasOwnProperty(messageType))
    return parsedValues;

  var config = messageTypeMap[messageType];

  try {
    var values = config.parser(payload, 12);
    for (var i = 0; i < values.length && i < config.indices.length; i++)
      parsedValues[config.indices[i]] = values[i];
  }
  catch (e) {
    console.error("RTCM3 parsing error:", e.message);
  }

  return parsedValues;
}