private void saveRGB(string fileName, ImageFormat imageformat)
{
Bitmap bmp = new Bitmap(_width, _height, PixelFormat.Format24bppRgb);
BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, bmp.PixelFormat);
byte[] buf = new byte[bmpData.Stride * bmpData.Height];
int nBitsPerDepth = (int)(_dict.Dictionary["BitsPerComponent"] as PDFNumber).GetValue();
_dict.GetStream().Position = 0;
BitsReader br = new BitsReader(_dict.GetStream());
for (int i = 0; i < _height; ++i)
{
for (int j = 0; j < _width; ++j)
{
buf[i * bmpData.Stride + j * 3 + 2] = (byte)br.ReadBits(nBitsPerDepth);
buf[i * bmpData.Stride + j * 3 + 1] = (byte)br.ReadBits(nBitsPerDepth);
buf[i * bmpData.Stride + j * 3] = (byte)br.ReadBits(nBitsPerDepth);
}
}
System.Runtime.InteropServices.Marshal.Copy(buf, 0, bmpData.Scan0, buf.Length);
bmp.UnlockBits(bmpData);
bmp.Save(fileName, imageformat);
bmp.Dispose();
}
public static int Decode(Stream input, int nBitsPerDepth, Stream output)
{
input.Position = 0;
BitsReader reader = new BitsReader(input);
int clearCode = 1 << nBitsPerDepth;
int endOfCode = clearCode + 1;
int nBits = nBitsPerDepth + 1;
initDict(nBitsPerDepth);
int code = reader.ReadBits(nBits);
if (code != (1 << nBitsPerDepth))
{
return(-1);
}
code = reader.ReadBits(nBits);
for (int i = 0; i < _dictionary[code].Length; ++i)
{
output.WriteByte(_dictionary[code][i]);
}
int old = code;
code = reader.ReadBits(nBits);
while (code != endOfCode)
{
if (_dictionaryLen == (1 << nBits) - 1)
{
nBits++;
}
if (nBits > StandartNumOfBits)
{
nBits = 12;
}
if (code < 0 || code > _dictionaryLen)
{
return(-1);
}
if (code == clearCode)
{
reset(nBitsPerDepth);
nBits = nBitsPerDepth + 1;
code = reader.ReadBits(nBits);
for (int i = 0; i < _dictionary[code].Length; ++i)
{
output.WriteByte(_dictionary[code][i]);
}
}
else
{
if (code == _dictionaryLen)
{
Array <byte> str = _dictionary[old];
str += str[0];
for (int i = 0; i < str.Length; ++i)
{
output.WriteByte(str[i]);
}
addInDict(str);
}
else
{
for (int i = 0; i < _dictionary[code].Length; ++i)
{
output.WriteByte(_dictionary[code][i]);
}
addInDict(_dictionary[old] + _dictionary[code][0]);
}
}
old = code;
code = reader.ReadBits(nBits);
}
return(0);
}
