public bool TryReadFieldId(out StFieldId field)
{
if (data.Length <= ConsumedBytes)
{
field = new StFieldId(StTypeCode.NotPresent, 0);
return(false);
}
var byte1 = data[ConsumedBytes];
if (byte1 == 0)
{
// low 4 bits == 0 && high 4 bits == 0
if (data.Length <= ConsumedBytes + 2)
{
field = new StFieldId(StTypeCode.NotPresent, 0);
return(false);
}
field = new StFieldId(
(StTypeCode)data[ConsumedBytes + 1],
data[ConsumedBytes + 2]);
ConsumedBytes += 3;
return(true);
}
else if (byte1 < 16)
{
// low 4 bits <> 0 && high 4 bits == 0
if (data.Length <= ConsumedBytes + 1)
{
field = new StFieldId(StTypeCode.NotPresent, 0);
return(false);
}
field = new StFieldId(
(StTypeCode)data[ConsumedBytes + 1],
byte1);
ConsumedBytes += 2;
return(true);
}
else if ((byte1 & 0x0F) == 0 && (byte1 & 0xF0) != 0)
{
// low 4 bits == 0 && high 4 bits <> 0
if (data.Length <= ConsumedBytes + 1)
{
field = new StFieldId(StTypeCode.NotPresent, 0);
return(false);
}
field = new StFieldId(
(StTypeCode)(byte1 >> 4),
data[ConsumedBytes + 1]);
ConsumedBytes += 2;
return(true);
}
else
{
// low 4 bits <> 0 && high 4 bits <> 0
field = new StFieldId(
(StTypeCode)(byte1 >> 4),
(uint)byte1 & 0x0F);
ConsumedBytes += 1;
return(true);
}
}
public bool Equals(StFieldId other)
{
return(this == other);
}
