public static List <int> DecompressData(BitReader reader)
{
ArithmeticDecoder decoder = new ArithmeticDecoder(reader);
var decompressedData = new List <int>();
// reading loop...
for (; ;)
{
uint symbol = decoder.DecodeSymbol();
if (symbol == EOF)
{
break;
}
int reconstructSymbolFromRange = (int)symbol - 255;
decompressedData.Add(reconstructSymbolFromRange);
decoder.arithmeticModel.UpdateModel(symbol);
}
return(decompressedData);
}
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();
}