private uint DecodeSymbol()
{
Range = (ulong)(High - Low) + 1;
uint code_sum = (uint)(((ulong)(Code - Low + 1) * arithmeticModel.GetSymbolTotalSum() - 1) / Range);
uint symbol = arithmeticModel.GetSymbolForSpecifiedSum(code_sum);
High = Low + (uint)((Range * arithmeticModel.GetSymbolSumLimitH(symbol)) / arithmeticModel.GetSymbolTotalSum() - 1);
Low = Low + (uint)((Range * arithmeticModel.GetSymbolSumLimitL(symbol)) / arithmeticModel.GetSymbolTotalSum());
for (; ;)
{
if ((High & firstShiftingMask) == (Low & firstShiftingMask))
{
Low <<= 1;
High <<= 1;
High |= 1;
Code = (Code << 1) | reader.ReadNBits(1);
}
else if ((Low & secondShiftingMask) == 0x40000000 && (High & secondShiftingMask) == 0x80000000)
{
Code = ((Code ^ 0x40000000) << 1) | reader.ReadNBits(1);
High = ((High | 0x40000000) << 1) | 1;
Low = (Low & 0x3FFFFFFF) << 1;
}
else
{
break;
}
}
return(symbol);
}
public BmpFileObject(string filePath)
{
_image = new Bitmap(256, 256);
_dataContainer = new byte[256, 256];
BitReader reader = new BitReader(filePath);
for (int i = 0; i < _headerContainer.Length; i++)
{
_headerContainer[i] = (byte)reader.ReadNBits(8);
}
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
_dataContainer[i, j] = (byte)reader.ReadNBits(8);
_image.SetPixel(j, 255 - i, Color.FromArgb(_dataContainer[i, j], _dataContainer[i, j], _dataContainer[i, j]));
}
}
reader.Dispose();
}
public ArithmeticDecoder(BitReader reader)
{
this.reader = reader;
Code = reader.ReadNBits(32);
arithmeticModel = new ArithmeticModel(TOTAL_SYMBOLS);
}
public BmpFileObject(string filePath, ref int kReconstructError, ref int selectedPredictor)
{
_dataContainerEncoded = new int[256, 256];
BitReader reader = new BitReader(filePath);
for (int i = 0; i < _headerContainer.Length; i++)
{
_headerContainer[i] = (byte)reader.ReadNBits(8);
}
selectedPredictor = (int)reader.ReadNBits(4);
kReconstructError = (int)reader.ReadNBits(4);
var saveMode = (int)reader.ReadNBits(2);
switch (saveMode)
{
case 0:
{
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
_dataContainerEncoded[i, j] = (int)reader.ReadNBits(9) - 255;
}
}
break;
}
case 1:
{
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
var index = 0;
var lineNumber = 0;
while (reader.ReadNBits(1) == 1)
{
lineNumber++;
}
if (lineNumber == 0)
{
_dataContainerEncoded[i, j] = 0;
}
else
{
index = (int)reader.ReadNBits(lineNumber);
if (index >= (1 << (lineNumber - 1)))
{
_dataContainerEncoded[i, j] = index;
}
else
{
_dataContainerEncoded[i, j] = index - (1 << lineNumber) + 1;
}
}
}
}
break;
}
case 2:
{
var intDecodedValuesList = ArithmeticDecoder.DecompressData(reader);
_dataContainerEncoded = Helpers.BuildMatrixFromListArithmetic(intDecodedValuesList);
break;
}
default: break;
}
reader.Dispose();
}
