public BitArrayWrapper Read2ndOrderCodeWord(BitInputStream input)
{
bool done = false;
int prevbit = 0;
int curbit = 0;
int bcounter = -1;
BitArrayWrapper tempSet = new BitArrayWrapper();
while (done == false)
{
curbit = input.ReadBit();
bcounter++;
if ((curbit == 1) & (prevbit == 1))
{
done = true;
}
else if ((curbit == 1) & (prevbit == 0))
{
tempSet.Set(bcounter);
prevbit = curbit;
}
else
{
prevbit = curbit;
}
}
return(tempSet);
}
public void Decompress(BitInputStream input, Stream output, long bufferSize)
{
long pairLength = -1000;
long pairPosition = -1000;
long currentBufferPosition = 0;
long fileSize;
long adj = 0;
BitArray tempArray = new BitArray(1);
fileSize = Decode3rdOrderCodeWord(Read3rdOrderCodeWord(input));
bufferSize = Decode3rdOrderCodeWord(Read3rdOrderCodeWord(input));
byte[] buffer = new byte[fileSize];
while (currentBufferPosition < fileSize)
{
if (fileSize != bufferSize)
{
adj = currentBufferPosition;
}
pairLength = Decode2ndOrderCodeWord(Read2ndOrderCodeWord(input));
pairPosition = Decode3rdOrderCodeWord(Read3rdOrderCodeWord(input));
if ((pairLength > -1) & (pairPosition > -1))
{
if (pairLength == 0)
{
buffer[currentBufferPosition] = (byte)pairPosition;
currentBufferPosition++;
}
else
{
for (long i = 0; i < pairLength; i++)
{
buffer[currentBufferPosition + i] = buffer[adj + pairPosition + i - 1];
}
currentBufferPosition += pairLength;
}
}
}
WriteDecoding(output, buffer);
}
private static void DecompressFile(string inputFileName, string outputFileName)
{
var timeSpan = TimedAction(() =>
{
OracleDecoder _decoder = new OracleDecoder();
using (var inputStream = new FileStream(inputFileName, FileMode.Open))
{
using (var outputStream = new FileStream(outputFileName, FileMode.CreateNew))
{
using (var bitInputStream = new BitInputStream(inputStream))
{
_decoder.Decompress(bitInputStream, outputStream, BufferSize);
}
}
}
});
Console.WriteLine("Decompression Time : {0}", timeSpan.ToString("g"));
}
