public static int DetermineContextID(this LiteralContextMode mode, byte mostRecentByte, byte secondRecentByte)
{
return(mode switch {
LiteralContextMode.LSB6 => mostRecentByte & 0x3F,
LiteralContextMode.MSB6 => mostRecentByte >> 2,
LiteralContextMode.UTF8 => LUT0[mostRecentByte] | LUT1[secondRecentByte],
LiteralContextMode.Signed => (LUT2[mostRecentByte] << 3) | LUT2[secondRecentByte],
_ => throw new InvalidOperationException("Invalid literal context mode: " + mode)
});
// State helpers
public int NextLiteralContextID(LiteralContextMode mode)
{
return(mode.DetermineContextID(LiteralBuffer.Front, LiteralBuffer.Back));
}