public static byte[] LZSS_ExpandData(byte[] mInput)
{
/** Current window position */
int winPos = 1;
/** Byte to write to output buffer */
byte outByte = 0;
/** Length of the data match found */
int matchLen = 0;
/** Position in the window of the data match */
int matchPos = 0;
/** Indicator of End Of Stream reached */
bool eosReached = false;
//Private Virable
BitQuery BQ = new BitQuery(mInput);
List<byte> Result = new List<byte>();
byte[] LZSS_window = new byte[LZSS_WINDOW_SIZE];
try
{
while (!eosReached)
{
/* If next bit is 1, next byte is uncompressed*/
if (BQ.GetBit() == 1)
{
/* Get uncompressed byte */
outByte = Convert.ToByte(BQ.GetByte());
/* Output byte*/
Result.Add(outByte);
/* Add byte in window */
LZSS_window[winPos] = outByte;
/* Increase window position */
winPos = (winPos + 1) & (LZSS_WINDOW_SIZE - 1);
}
/* If next bit is 0, compressed data follows */
else
{
/* Get compressed data as window position of match*/
matchPos = BQ.GetBit(LZSS_INDEX_BIT_COUNT);
/* If end of stream, exit */
if (matchPos == LZSS_END_OF_STREAM)
{
eosReached = true;
}
else
{
/* Get length of string match */
matchLen = BQ.GetBit(LZSS_LENGTH_BIT_COUNT);
/* Add break even + 1 to get the correct length. Length zero and
* the break even value are subtracted from the length during
* compression to save space. */
matchLen = matchLen + (LZSS_BREAK_EVEN + 1);
/* For every byte in match */
for (int i = 0; i < matchLen; i++)
{
/* Get matching byte from window */
outByte = LZSS_window[(matchPos + i) & (LZSS_WINDOW_SIZE - 1)];
/* Output byte */
Result.Add(outByte);
/* Add matched byte to current window position */
LZSS_window[winPos] = outByte;
/* Increase window position */
winPos = (winPos + 1) & (LZSS_WINDOW_SIZE - 1);
}
}
}
}
}
catch
{
return null;
}
return Result.ToArray<byte>();
}
private void WriteCompressFile(byte[] mInput, string File)
{
StreamWriter SW = new StreamWriter(File);
BitQuery BQ = new BitQuery(mInput);
int Symble = BQ.GetBit();
while (Symble >= 0)
{
if (Symble == 1)
{
SW.Write("1 ");
for (int i = 0; i < 8; i++)
{
SW.Write(BQ.GetBit());
}
SW.Write("\r\n");
}
else
{
SW.Write("0 ");
for (int i = 0; i < 10; i++)
{
SW.Write(BQ.GetBit());
}
SW.Write(" ");
for (int i = 0; i < 4; i++)
{
SW.Write(BQ.GetBit());
}
SW.Write("\r\n");
}
Symble = BQ.GetBit();
}
SW.Close();
}
