decodeRecord static method

Implementation

static IntelHex decodeRecord(String data){
  List<String> value = data.replaceAll('\r\n', '').replaceAll('\n','').split(':');
  IntelHex ihr = IntelHex();
  for(int i = 1; i < value.length;i++){
    List<int> bin = unhexlify(value[i]);
    int length = bin.length;
    int recordLength = bin[0];
    if(length != (5 + recordLength)){
      throw Exception('Record at line $i has invalid length: $length , $recordLength');
    }
    int address = bin[1]*256 + bin[2];
    int recordType = bin[3];
    if(recordType < 0 || recordType > 5){
      throw Exception('Invalid RecordType at line $i recordType: $recordType');
    }

    int crc = bin.fold(0, (p, c) => p + c);
    crc &= 0x0FF;
    if(crc != 0){
      throw Exception('Record at line $i has invalid checksum: $crc');
    }

    if(recordType == 0){
      address += ihr.offset;
      for(int j = 4; j < 4+recordLength;j++){//i in range_g(4, 4+record_length){
        if(ihr.buffer.containsKey(address)){
          throw Exception('Address overlapped at line $i');
        }
        ihr.buffer[address] = bin[j];
        address += 1;
      }
    }
    else if(recordType == 1){
      if(recordLength != 0){
        throw Exception('End of record error at line $i');
      }
    }
    else if(recordType == 2){
      //Extended 8086 Segment Record
      if(recordLength != 2 || address != 0){
        throw Exception('Invalid Extended Segment Address Record at line $i');
      }
      ihr.offset = (bin[4]*256 + bin[5]) * 16;
    }
    else if(recordType == 3){
      //Start Segment Address Record
      if(recordLength != 4 || address != 0){
        throw Exception('Invalid Start Segment Address Record at line $i');
      }
      if(ihr.startAddress != null){
        throw Exception('Start Address Record appears twice at line $i');
      }
      ihr.startAddress = {
        'CS': bin[4]*256 + bin[5],
        'IP': bin[6]*256 + bin[7],
      };
    }
    else if(recordType == 4){
      //Extended Linear Address Record
      if(recordLength != 2 || address != 0){
        throw Exception('Invalid Extended Linear Address Record at line $i');
      }
      ihr.offset = (bin[4]*256 + bin[5]) * 65536;
    }
    else if(recordType == 5){
      //Start Linear Address Record
      if(recordLength != 4 || address != 0){
          throw Exception('Invalid Start Linear Address Record at line $i');
      }
      if(ihr.startAddress != null){
        throw Exception('Start Address Record appears twice at line $i');
      }
      ihr.startAddress = {
        'EIP': (bin[4]*16777216 + bin[5]*65536 + bin[6]*256 + bin[7]),
      };
    }
  }
  return ihr;
}