public BinaryShiftToken(Token previous,
int binaryShiftStart,
int binaryShiftByteCount)
: base(previous)
{
this.binaryShiftStart = (short) binaryShiftStart;
this.binaryShiftByteCount = (short) binaryShiftByteCount;
}
public State(Token token, int mode, int binaryBytes, int bitCount)
{
this.token = token;
this.mode = mode;
this.binaryShiftByteCount = binaryBytes;
this.bitCount = bitCount;
// Make sure we match the token
//int binaryShiftBitCount = (binaryShiftByteCount * 8) +
// (binaryShiftByteCount == 0 ? 0 :
// binaryShiftByteCount <= 31 ? 10 :
// binaryShiftByteCount <= 62 ? 20 : 21);
//assert this.bitCount == token.getTotalBitCount() + binaryShiftBitCount;
}
public SimpleToken(Token previous, int totalBitCount, int value, int bitCount)
: base(previous, totalBitCount)
{
this.value = (short) value;
this.bitCount = (short) bitCount;
}
protected Token(Token previous)
{
this.previous = previous;
}
/// <summary>
/// Create a new state representing this state with a latch to a (not
/// necessary different) mode, and then a code.
/// </summary>
public State latchAndAppend(int mode, int value)
{
//assert binaryShiftByteCount == 0;
int bitCount = this.bitCount;
Token token = this.token;
if (mode != this.mode)
{
int latch = HighLevelEncoder.LATCH_TABLE[this.mode][mode];
token = token.add(latch & 0xFFFF, latch >> 16);
bitCount += latch >> 16;
}
int latchModeBitCount = mode == HighLevelEncoder.MODE_DIGIT ? 4 : 5;
token = token.add(value, latchModeBitCount);
return new State(token, mode, 0, bitCount + latchModeBitCount);
}
public BitArray toBitArray(byte[] text)
{
// Reverse the tokens, so that they are in the order that they should
// be output
var symbols = new LinkedList<Token>();
for (Token token = endBinaryShift(text.Length).token; token != null; token = token.Previous)
{
symbols.AddFirst(token);
}
BitArray bitArray = new BitArray();
// Add each token to the result.
foreach (Token symbol in symbols)
{
symbol.appendTo(bitArray, text);
}
//assert bitArray.getSize() == this.bitCount;
return bitArray;
}
/// <summary>
/// Create the state identical to this one, but we are no longer in
/// Binary Shift mode.
/// </summary>
public State endBinaryShift(int index)
{
if (binaryShiftByteCount == 0)
{
return this;
}
Token token = this.token;
token = token.addBinaryShift(index - binaryShiftByteCount, binaryShiftByteCount);
//assert token.getTotalBitCount() == this.bitCount;
return new State(token, mode, 0, this.bitCount);
}
/// <summary>
/// Create a new state representing this state, but an additional character
/// output in Binary Shift mode.
/// </summary>
public State addBinaryShiftChar(int index)
{
Token token = this.token;
int mode = this.mode;
int bitCount = this.bitCount;
if (this.mode == HighLevelEncoder.MODE_PUNCT || this.mode == HighLevelEncoder.MODE_DIGIT)
{
//assert binaryShiftByteCount == 0;
int latch = HighLevelEncoder.LATCH_TABLE[mode][HighLevelEncoder.MODE_UPPER];
token = token.add(latch & 0xFFFF, latch >> 16);
bitCount += latch >> 16;
mode = HighLevelEncoder.MODE_UPPER;
}
int deltaBitCount =
(binaryShiftByteCount == 0 || binaryShiftByteCount == 31) ? 18 :
(binaryShiftByteCount == 62) ? 9 : 8;
State result = new State(token, mode, binaryShiftByteCount + 1, bitCount + deltaBitCount);
if (result.binaryShiftByteCount == 2047 + 31)
{
// The string is as long as it's allowed to be. We should end it.
result = result.endBinaryShift(index + 1);
}
return result;
}
/// <summary>
/// Create a new state representing this state, with a temporary shift
/// to a different mode to output a single value.
/// </summary>
public State shiftAndAppend(int mode, int value)
{
//assert binaryShiftByteCount == 0 && this.mode != mode;
Token token = this.token;
int thisModeBitCount = this.mode == HighLevelEncoder.MODE_DIGIT ? 4 : 5;
// Shifts exist only to UPPER and PUNCT, both with tokens size 5.
token = token.add(HighLevelEncoder.SHIFT_TABLE[this.mode][mode], thisModeBitCount);
token = token.add(value, 5);
return new State(token, this.mode, 0, this.bitCount + thisModeBitCount + 5);
}
private readonly int totalBitCount; // For debugging purposes, only
protected Token(Token previous, int totalBitCount)
{
this.previous = previous;
this.totalBitCount = totalBitCount;
}