/// <summary>
/// Creates a <see cref="DeviceFirmware"/> object extracted from the specified ASCII
/// stream in Intel HEX format, the specified metadata string and page size.
/// </summary>
/// <param name="metadata">The firmware metadata encoded in a text string representation.</param>
/// <param name="stream">The ASCII stream in Intel HEX format from which to extract the device firmware.</param>
/// <param name="pageSize">The size of the memory blocks used to upload the device firmware.</param>
/// <returns>
/// A new <see cref="DeviceFirmware"/> object representing the extracted binary firware blob,
/// together with the metadata extracted from the firmware file name.
/// </returns>
public static DeviceFirmware FromStream(string metadata, Stream stream, int pageSize)
{
const char StartCode = ':';
var firmwareMetadata = FirmwareMetadata.Parse(metadata);
using (var reader = new StreamReader(stream))
{
var lineNumber = 0;
var baseAddress = 0;
var hexDigit = new char[4];
var data = new short[0];
Expand(ref data, pageSize);
while (!reader.EndOfStream)
{
if (ReadChar(reader, hexDigit) != StartCode)
{
throw new ArgumentException($"{lineNumber}: Invalid record start code found in hex stream.");
}
var sum = 0;
var count = ReadHexByte(reader, hexDigit);
var address = ReadHexUInt16(reader, hexDigit);
var recordType = (RecordType)ReadHexByte(reader, hexDigit);
switch (recordType)
{
case RecordType.Data:
sum = ReadHexData(reader, hexDigit, ref data, baseAddress + address, count, pageSize);
break;
case RecordType.EndOfFile: break;
case RecordType.ExtendedSegmentAddress:
if (count != 2)
{
throw new ArgumentException($"{lineNumber}: Invalid extended segment address payload found in hex stream.");
}
var segmentAddress = ReadHexUInt16(reader, hexDigit);
baseAddress = segmentAddress * 16;
sum = Checksum(segmentAddress);
break;
case RecordType.ExtendedLinearAddress:
if (count != 2)
{
throw new ArgumentException($"{lineNumber}: Invalid extended linear address payload found in hex stream.");
}
var extendedAddress = ReadHexUInt16(reader, hexDigit);
baseAddress = extendedAddress << 16;
sum = Checksum(extendedAddress);
break;
case RecordType.StartLinearAddress:
case RecordType.StartSegmentAddress: throw new NotSupportedException($"{lineNumber}: Unsupported record type found in hex stream.");
default: throw new ArgumentException($"{lineNumber}: Invalid record type found in hex stream.");
}
sum = (byte)(sum + count + Checksum(address) + (byte)recordType);
var checksum = sum + ReadHexByte(reader, hexDigit);
if ((byte)checksum != 0)
{
throw new ArgumentException($"{lineNumber}: Invalid data checksum found in hex stream.");
}
reader.ReadLine();
lineNumber++;
}
var byteCode = Array.ConvertAll(data, value => (byte)value);
return(new DeviceFirmware(firmwareMetadata, byteCode));
}
}
private DeviceFirmware(FirmwareMetadata metadata, byte[] data)
{
Metadata = metadata;
Data = data;
}
