private void WriteBitAndUnderflowBits(uint value)
{
value &= 0x00000001;
Writer.WriteNBits(value, 1);
uint negatedValue = (~value & 0x00000001);
while (UnderflowBits > 0)
{
Writer.WriteNBits(negatedValue, 1);
UnderflowBits--;
}
}
public static void CompressFile(string inputFile, string outputFile)
{
// Read uncompressed file variables
BitReader reader = new BitReader(inputFile);
var inputSize = NR_BITS_TO_READ * new FileInfo(inputFile).Length;
// Write compressed file variables
BitWriter writer = new BitWriter(outputFile);
Coder coder = new Coder(writer);
for (var i = inputSize - 1; i >= 0; i -= 8)
{
uint symbol = Convert.ToUInt32(reader.ReadNBits(NR_BITS_TO_READ));
// For each symbol and update the model statistics
coder.EncodeSymbol(symbol);
coder.arithmeticModel.UpdateModel(symbol);
}
reader.Dispose();
coder.EncodeSymbol(EOF);
coder.FlushEncoder();
writer.WriteNBits(1, 7);
writer.Dispose();
}
public static void DecompressFile(string inputFile, string outputFile)
{
BitReader reader = new BitReader(inputFile);
BitWriter writer = new BitWriter(outputFile);
Decoder decoder = new Decoder(reader);
// reading loop...
for (; ;)
{
uint symbol = decoder.DecodeSymbol();
if (symbol == EOF)
{
break;
}
writer.WriteNBits(symbol, 8);
decoder.arithmeticModel.UpdateModel(symbol);
}
reader.Dispose();
writer.WriteNBits(1, 7);
writer.Dispose();
}