// Create a new state representing this state, but an additional character
// output in Binary Shift mode.
public State AddBinaryShiftChar(int index)
{
IToken tokens = Tokens;
EncodingMode mode = Mode;
int bitCount = BitCount;
if (Mode == EncodingMode.Punct || Mode == EncodingMode.Digit)
{
var latch = LatchTable[Mode][EncodingMode.Upper];
tokens = new SimpleToken(tokens, latch & 0xFFFF, (byte)(latch >> 16));
bitCount += (int)(latch >> 16);
mode = EncodingMode.Upper;
}
int deltaBitCount = 8;
if (ShiftByteCount == 0 || ShiftByteCount == 31)
{
deltaBitCount = 18;
}
else if (ShiftByteCount == 62)
{
deltaBitCount = 9;
}
var result = new State(mode, tokens, ShiftByteCount + 1, bitCount + deltaBitCount);
if (result.ShiftByteCount == 2047 + 31)
{
// The string is as long as it's allowed to be. We should end it.
result = result.EndBinaryShift(index + 1);
}
return(result);
}
// Create a new state representing this state, with a temporary shift
// to a different mode to output a single value.
public State ShiftAndAppend(EncodingMode mode, uint value)
{
IToken tokens = Tokens;
// Shifts exist only to UPPER and PUNCT, both with tokens size 5.
tokens = new SimpleToken(tokens, ShiftTable[Mode][mode], Mode.BitCount());
tokens = new SimpleToken(tokens, value, 5);
return(new State(Mode, tokens, 0, BitCount + Mode.BitCount() + 5));
}
// Create a new state representing this state with a latch to a (not
// necessary different) mode, and then a code.
public State LatchAndAppend(EncodingMode mode, uint value)
{
int bitCount = BitCount;
IToken tokens = Tokens;
if (mode != Mode)
{
uint latch = LatchTable[Mode][mode];
tokens = new SimpleToken(tokens, latch & 0xFFFF, (byte)(latch >> 16));
bitCount += (int)(latch >> 16);
}
tokens = new SimpleToken(tokens, value, mode.BitCount());
return(new State(mode, tokens, 0, bitCount + mode.BitCount()));
}
