public long DecodeIAID(long codeLen, ArithmeticDecoderStats stats)
{
previous = 1;
for (long i = 0; i < codeLen; i++)
{
int bit = DecodeBit(previous, stats);
previous = BinaryOperation.Bit32ShiftL(previous, 1) | bit;
}
return(previous - (1 << (int)codeLen));
}
public long Get24Bits()
{
while (bufferLength < 24)
{
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | (reader.Readbyte() & 0xff));
bufferLength += 8;
noOfbytesRead++;
}
return((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 24))) & 0xffffff);
}
public void Start()
{
buffer0 = reader.Readbyte();
buffer1 = reader.Readbyte();
c = BinaryOperation.Bit32ShiftL((buffer0 ^ 0xff), 16);
Readbyte();
c = BinaryOperation.Bit32ShiftL(c, 7);
counter -= 7;
a = 0x80000000l;
}
public int Get2DCode()
{
int tuple0, tuple1;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
int lookup = (int)((BinaryOperation.Bit32ShiftR(buffer, 1)) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
}
else if (bufferLength == 8)
{
int lookup = (int)((BinaryOperation.Bit32ShiftR(buffer, 1)) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
}
else
{
int lookup = (int)((BinaryOperation.Bit32ShiftL(buffer, (int)(7 - bufferLength))) & 0x7f);
tuple0 = twoDimensionalTable1[lookup, 0];
tuple1 = twoDimensionalTable1[lookup, 1];
if (tuple0 < 0 || tuple0 > (int)bufferLength)
{
int right = (reader.Readbyte() & 0xff);
long left = (BinaryOperation.Bit32ShiftL(buffer, 8));
buffer = left | right;
bufferLength += 8;
noOfbytesRead++;
int look = (int)(BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 7)) & 0x7f);
tuple0 = twoDimensionalTable1[look, 0];
tuple1 = twoDimensionalTable1[look, 1];
}
}
if (tuple0 < 0)
{
return(0);
}
bufferLength -= tuple0;
return(tuple1);
}
private int DecodeIntBit(ArithmeticDecoderStats stats)
{
int bit = DecodeBit(previous, stats);
if (previous < 0x100)
{
previous = BinaryOperation.Bit32ShiftL(previous, 1) | bit;
}
else
{
previous = (((BinaryOperation.Bit32ShiftL(previous, 1)) | bit) & 0x1ff) | 0x100;
}
return(bit);
}
private void Readbyte()
{
if (buffer0 == 0xff)
{
if (buffer1 > 0x8f)
{
counter = 8;
}
else
{
buffer0 = buffer1;
buffer1 = reader.Readbyte();
c = c + 0xfe00 - (BinaryOperation.Bit32ShiftL(buffer0, 9));
counter = 7;
}
}
else
{
buffer0 = buffer1;
buffer1 = reader.Readbyte();
c = c + 0xff00 - (BinaryOperation.Bit32ShiftL(buffer0, 8));
counter = 8;
}
}
public int GetBlackCode()
{
int tuple0, tuple1;
long code;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
}
while (true)
{
if (bufferLength >= 6 && ((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 6))) & 0x3f) == 0)
{
if (bufferLength <= 13)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(13 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 13));
}
tuple0 = blackTable1[(int)(code & 0x7f), 0];
tuple1 = blackTable1[(int)(code & 0x7f), 1];
}
else if (bufferLength >= 4 && ((buffer >> ((int)bufferLength - 4)) & 0x0f) == 0)
{
if (bufferLength <= 12)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(12 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 12));
}
int lookup = (int)((code & 0xff) - 64);
if (lookup >= 0)
{
tuple0 = blackTable2[lookup, 0];
tuple1 = blackTable2[lookup, 1];
}
else
{
tuple0 = blackTable1[blackTable1.Length + lookup, 0];
tuple1 = blackTable1[blackTable1.Length + lookup, 1];
}
}
else
{
if (bufferLength <= 6)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(6 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 6));
}
int lookup = (int)(code & 0x3f);
if (lookup >= 0)
{
tuple0 = blackTable3[lookup, 0];
tuple1 = blackTable3[lookup, 1];
}
else
{
tuple0 = blackTable2[blackTable2.Length + lookup, 0];
tuple1 = blackTable2[blackTable2.Length + lookup, 1];
}
}
if (tuple0 > 0 && tuple0 <= (int)bufferLength)
{
bufferLength -= tuple0;
return(tuple1);
}
if (bufferLength >= 13)
{
break;
}
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | (reader.Readbyte() & 0xff));
bufferLength += 8;
noOfbytesRead++;
}
bufferLength--;
return(1);
}
public int GetWhiteCode()
{
int tuple0, tuple1;
long code;
if (bufferLength == 0)
{
buffer = (reader.Readbyte() & 0xff);
bufferLength = 8;
noOfbytesRead++;
}
while (true)
{
if (bufferLength >= 7 && ((BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 7))) & 0x7f) == 0)
{
if (bufferLength <= 12)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(12 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 12));
}
tuple0 = whiteTable1[(int)(code & 0x1f), 0];
tuple1 = whiteTable1[(int)(code & 0x1f), 1];
}
else
{
if (bufferLength <= 9)
{
code = BinaryOperation.Bit32ShiftL(buffer, (int)(9 - bufferLength));
}
else
{
code = BinaryOperation.Bit32ShiftR(buffer, (int)(bufferLength - 9));
}
int lookup = (int)(code & 0x1ff);
if (lookup >= 0)
{
tuple0 = whiteTable2[lookup, 0];
tuple1 = whiteTable2[lookup, 1];
}
else
{
tuple0 = whiteTable2[whiteTable2.Length + lookup, 0];
tuple1 = whiteTable2[whiteTable2.Length + lookup, 1];
}
}
if (tuple0 > 0 && tuple0 <= (int)bufferLength)
{
bufferLength -= tuple0;
return(tuple1);
}
if (bufferLength >= 12)
{
break;
}
buffer = ((BinaryOperation.Bit32ShiftL(buffer, 8)) | reader.Readbyte() & 0xff);
bufferLength += 8;
noOfbytesRead++;
}
bufferLength--;
return(1);
}
public int DecodeBit(long context, ArithmeticDecoderStats stats)
{
int iCX = BinaryOperation.Bit8Shift(stats.GetContextCodingTableValue((int)context), 1, BinaryOperation.RIGHT_SHIFT);
int mpsCX = stats.GetContextCodingTableValue((int)context) & 1;
int qe = qeTable[iCX];
a -= qe;
int bit;
if (c < a)
{
if ((a & 0x80000000) != 0)
{
bit = mpsCX;
}
else
{
if (a < qe)
{
bit = 1 - mpsCX;
if (switchTable[iCX] != 0)
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | (1 - mpsCX));
}
else
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | mpsCX);
}
}
else
{
bit = mpsCX;
stats.SetContextCodingTableValue((int)context, (nmpsTable[iCX] << 1) | mpsCX);
}
do
{
if (counter == 0)
{
Readbyte();
}
a = BinaryOperation.Bit32ShiftL(a, 1);
c = BinaryOperation.Bit32ShiftL(c, 1);
counter--;
} while ((a & 0x80000000) == 0);
}
}
else
{
c -= a;
if (a < qe)
{
bit = mpsCX;
stats.SetContextCodingTableValue((int)context, (nmpsTable[iCX] << 1) | mpsCX);
}
else
{
bit = 1 - mpsCX;
if (switchTable[iCX] != 0)
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | (1 - mpsCX));
}
else
{
stats.SetContextCodingTableValue((int)context, (nlpsTable[iCX] << 1) | mpsCX);
}
}
a = qe;
do
{
if (counter == 0)
{
Readbyte();
}
a = BinaryOperation.Bit32ShiftL(a, 1);
c = BinaryOperation.Bit32ShiftL(c, 1);
counter--;
} while ((a & 0x80000000) == 0);
}
return(bit);
}
public DecodeIntResult DecodeInt(ArithmeticDecoderStats stats)
{
long value;
previous = 1;
int s = DecodeIntBit(stats);
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
if (DecodeIntBit(stats) != 0)
{
value = 0;
for (int i = 0; i < 32; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 4436;
}
else
{
value = 0;
for (int i = 0; i < 12; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 340;
}
}
else
{
value = 0;
for (int i = 0; i < 8; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 84;
}
}
else
{
value = 0;
for (int i = 0; i < 6; i++)
{
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
value += 20;
}
}
else
{
value = DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
value += 4;
}
}
else
{
value = DecodeIntBit(stats);
value = BinaryOperation.Bit32ShiftL(value, 1) | DecodeIntBit(stats);
}
int decodedInt;
if (s != 0)
{
if (value == 0)
{
return(new DecodeIntResult((int)value, false));
}
decodedInt = (int)-value;
}
else
{
decodedInt = (int)value;
}
return(new DecodeIntResult(decodedInt, true));
}