private byte readImageDescriptor(InputStream is) throws Exception {
int nindex = 0;
byte ides[] = new byte[9];
IOUtils.readFully(is, ides, 0, 9);
image_x = (ides[nindex++] & 0xff) | ((ides[nindex++] & 0xff) << 8);
image_y = (ides[nindex++] & 0xff) | ((ides[nindex++] & 0xff) << 8);
width = (ides[nindex++] & 0xff) | ((ides[nindex++] & 0xff) << 8);
height = (ides[nindex++] & 0xff) | ((ides[nindex++] & 0xff) << 8);
return ides[nindex++];
}
private void readLocalPalette(InputStream is, int num_of_color) throws Exception {
int index1 = 0;
int bytes2read = num_of_color * 3;
byte brgb[] = new byte[bytes2read];
IOUtils.readFully(is, brgb, 0, bytes2read);
rgbColorPalette = new int[num_of_color];
for (int i = 0; i < num_of_color; i++)
rgbColorPalette[i] =
((255 << 24)
| ((brgb[index1++] & 0xff) << 16)
| ((brgb[index1++] & 0xff) << 8)
| (brgb[index1++] & 0xff));
}
void readHeader(InputStream is) throws Exception {
int nindex = 0;
byte bhdr[] = new byte[13];
IOUtils.readFully(is, bhdr, 0, 13);
for (int i = 0; i < 3; i++) signature[i] = bhdr[nindex++];
for (int i = 0; i < 3; i++) version[i] = bhdr[nindex++];
screen_width = ((bhdr[nindex++] & 0xff) | ((bhdr[nindex++] & 0xff) << 8));
screen_height = ((bhdr[nindex++] & 0xff) | ((bhdr[nindex++] & 0xff) << 8));
flags = bhdr[nindex++];
bgcolor = bhdr[nindex++];
aspectRatio = bhdr[nindex++];
// The end
}