/// <summary>
/// Parses a
/// </summary>
/// <param name="hexRecord">The </param>
/// <returns></returns>
public static IntelHexRecord ParseHexRecord(this string hexRecord)
{
if (hexRecord == null)
{
throw new IOException("Hex record line can not be null");
}
if (hexRecord.Length < 11)
{
throw new IOException($"Hex record line length [{hexRecord}] is less than 11");
}
if (!hexRecord.StartsWith(":"))
{
throw new IOException($"Illegal line start character [{hexRecord}]");
}
var hexData = TryParseData(hexRecord.Substring(1));
if (hexData.Count != hexData[0] + 5)
{
throw new IOException($"Line [{hexRecord}] does not have required record length of [{hexData[0] + 5}]");
}
if (!Enum.IsDefined(typeof(IntelHexRecordType), (int)hexData[3]))
{
throw new IOException($"Invalid record type value: [{hexData[3]}]");
}
var checkSum = hexData[hexData[0] + 4];
hexData.RemoveAt(hexData[0] + 4);
if (!VerifyChecksum(hexData, checkSum))
{
throw new IOException($"Checksum for line [{hexRecord}] is incorrect");
}
var dataSize = hexData[0];
var newRecord = new IntelHexRecord
{
ByteCount = dataSize,
Address = (uint)((hexData[1] << 8) | hexData[2]),
RecordType = (IntelHexRecordType)hexData[3],
Data = hexData,
CheckSum = checkSum
};
hexData.RemoveRange(0, 4);
return(newRecord);
}
private uint HandleAddress(IntelHexRecord hexRecord)
{
uint result = 0;
switch (hexRecord.RecordType)
{
case IntelHexRecordType.Data:
result = _addressBase + hexRecord.Address;
break;
case IntelHexRecordType.ExtendedSegmentAddress:
_addressBase = (uint)((hexRecord.Data[0] << 8) | hexRecord.Data[1]) << 4;
result = _addressBase;
break;
case IntelHexRecordType.StartSegmentAddress:
result = _addressBase;
break;
case IntelHexRecordType.ExtendedLinearAddress:
_addressBase = (uint)((hexRecord.Data[0] << 8) | hexRecord.Data[1]) << 16;
result = _addressBase;
break;
case IntelHexRecordType.StartLinearAddress:
_addressBase = (uint)((hexRecord.Data[0] << 24) | (hexRecord.Data[1] << 16) |
(hexRecord.Data[2] << 8) | hexRecord.Data[3]);
result = _addressBase;
break;
default:
throw new ArgumentOutOfRangeException($"Unknown value read for [{nameof(hexRecord.RecordType)}]");
}
return(result);
}
