public DebugBinaryNumber Read(int bits)
{
if (bits < 0 || position + bits > length)
{
throw new ArgumentOutOfRangeException($"Attempting to read {bits} bits, but there's only {bitsLeft} bits left");
}
DebugBinaryNumber value = 0;
//For every bit we want to read...
for (int i = 0; i < bits; i++)
{
//...first, get the byte we are currently reading from...
DebugBinaryNumber @byte = data[byteIndex];
//...and then get the appropiate bit from that byte
DebugBinaryNumber mask = MaskUtility.MakeShifted(bitIndex);
DebugBinaryNumber bit = @byte & mask;
//Put the bit into the correct position be want to write
int shiftAmount = i - bitIndex;
if (shiftAmount < 0)
{
bit >>= -shiftAmount;
}
else
{
bit <<= shiftAmount;
}
//And write that bit into the final value
value |= bit;
//Update the bit and byte we next have to read from
bitIndex++;
if (bitIndex == 8)
{
byteIndex++;
bitIndex = 0;
}
}
return(value);
}
//Transforms the first "bits" into an array of bytes
public byte[] GetBytes(int bits)
{
if (bits < 0 || bits > 64)
{
throw new ArgumentOutOfRangeException(nameof(bits), $"Must be 0 < {nameof(bits)} < 64");
}
int length = (int)Math.Ceiling((float)bits / bitsPerByte);
byte[] bytes = new byte[length];
//clamp value to the bits we were asked for
DebugBinaryNumber clampedValue = value & MaskUtility.MakeFilled(bits);
//Here we shift packs of 8 bits to the right so that we can get that particular byte value
for (int i = 0; i < length; i++)
{
bytes[i] = clampedValue;
clampedValue >>= bitsPerByte;
}
return(bytes);
}
