public void WriteEncoding(BitOutputStream output, BitArrayWrapper encoding)
{
foreach (bool bit in encoding)
{
output.WriteBit(bit ? 1 : 0);
}
}
public int Encode2ndOrderCodeWord(BitOutputStream output, int n)
{
BitArrayWrapper encoding = new BitArrayWrapper();
int temp = n;
int i = Fibonacci.FibonacciSize - 1;
while (i > -1)
{
if (_fibonacciSequenceOrder2[i] < temp)
{
encoding.Set(i);
temp = temp - _fibonacciSequenceOrder2[i];
}
else if (_fibonacciSequenceOrder2[i] == temp)
{
encoding.Set(i);
i = 0;
}
i--;
}
encoding.Set(encoding.Length());
if (output != null)
{
WriteEncoding(output, encoding);
}
return(encoding.Length());
}
public void PairEncoder(BitOutputStream output, int length, int position)
{
if (length > _maxRepeat)
{
_maxRepeat = length;
}
if (length > 0)
{
long codelength = _encoder.Encode2ndOrderCodeWord(null, length) +
_encoder.Encode3rdOrderCodeWord(null, position);
long code2 = 0;
long i;
for (i = position; i < position + length; i++)
{
if (_buffer[i - 1] < 0)
{
code2 = code2 + _letterLengths[_buffer[i - 1] + 256];
}
else
{
code2 = code2 + _letterLengths[_buffer[i - 1]];
}
}
if (codelength < code2)
{
_encoder.Encode2ndOrderCodeWord(output, length);
_encoder.Encode3rdOrderCodeWord(output, position);
String s = "(" + length + ")(" + position + ")";
Console.WriteLine(s);
}
else
{
for (i = position; i < position + length; i++)
{
_encoder.Encode2ndOrderCodeWord(output, 0);
if (_buffer[i - 1] >= 0)
{
_encoder.Encode3rdOrderCodeWord(output, _buffer[i - 1]);
}
else
{
_encoder.Encode3rdOrderCodeWord(output, _buffer[i - 1] + 256);
}
}
}
}
else
{
_encoder.Encode2ndOrderCodeWord(output, length);
_encoder.Encode3rdOrderCodeWord(output, position);
String s = "(" + length + ")(" + position + ")";
Console.WriteLine(s);
}
}
public void Compress(Stream input, Stream output, int windowSize)
{
Oracle oracle;
int size;
int bsize = (int)input.Length;
int fileLeft = 0;
int a = -1;
int lastPosition = 0;
char s;
BitArrayWrapper Bits = new BitArrayWrapper();
float meter = 0;
float oldm = 0;
long bcounter = 0;
using (BitOutputStream bitOutput = new BitOutputStream(output))
{
//First output the original file size, and the buffer size.
_encoder.Encode3rdOrderCodeWord(bitOutput, bsize);
_encoder.Encode3rdOrderCodeWord(bitOutput, windowSize);
oracle = new Oracle();
while (input.Position < input.Length)
{
oracle.AddState(0);
size = (int)input.Length - (int)input.Position;
if (size <= windowSize)
{
_Sp = new int[size + 2];
_lrs = new int[size + 2];
_buffer = new byte[size + 1];
input.Read(_buffer, 0, (int)size);
fileLeft = size;
}
else
{
_Sp = new int[windowSize + 2];
_lrs = new int[windowSize + 2];
fileLeft = windowSize;
_buffer = new byte[windowSize + 1];
input.Read(_buffer, 0, (int)windowSize);
}
_Sp[0] = -1;
int k = 0;
int j;
int s1;
int pi1;
int endto;
lastPosition = 0;
if (fileLeft == size)
{
endto = fileLeft + 1;
}
else
{
endto = fileLeft;
}
for (int i = 1; i <= endto; i++)
{
bcounter++;
oracle.AddState(i);
s = (char)_buffer[i - 1];
Console.WriteLine(_buffer[i - 1]);
j = _Sp[i - 1];
pi1 = i - 1;
while ((j > -1) & (oracle.FindTransition(oracle.GetState(j), _buffer, s) == -2))
{
//Just keep track of the external transitions
oracle.AddTransition(j, i);
pi1 = j;
j = _Sp[j];
}
if (j == -1)
{
s1 = 0;
}
else
{
s1 = oracle.FindTransition(oracle.GetState(j), _buffer, s);
}
_Sp[i] = s1;
_lrs[i] = LengthRepeatedSuffix(pi1, _Sp[i]);
if ((i == fileLeft) & (lastPosition <= i - 1))
{
long z = 0;
for (z = (lastPosition); z < fileLeft; z++)
{
if (_buffer[z] >= 0)
{
PairEncoder(bitOutput, 0, _buffer[z]);
}
else
{
PairEncoder(bitOutput, 0, _buffer[z] + 256);
}
}
lastPosition = i - 1;
}
else if ((_lrs[i] < (i - lastPosition)))
{
if (_lrs[lastPosition + 1] == 0)
{
if (_buffer[lastPosition] >= 0)
{
PairEncoder(bitOutput, 0, _buffer[lastPosition]);
}
else
{
PairEncoder(bitOutput, 0, _buffer[lastPosition] + 256);
}
lastPosition = lastPosition + 1;
}
else
{
if (_lrs[i - 1] > (i - 1) - lastPosition)
{
k = GetBetterPosition(i - 1, lastPosition);
PairEncoder(bitOutput, (i - 1) - lastPosition, _Sp[k] - (i - 1) + lastPosition + 1);
lastPosition = i - 1;
}
else
{
PairEncoder(bitOutput, (i - 1) - lastPosition, _Sp[i - 1] - (i - 1) + lastPosition + 1);
lastPosition = i - 1;
}
}
}
}
}
}
}
