Avoid overflow in ljpeg_start().
void CLASS canon_600_load_raw()
{
  uchar  data[1120], *dp;
  ushort pixel[896], *pix;
  int irow, row, col, val;
  static const short mul[4][2] =
  { { 1141,1145 }, { 1128,1109 }, { 1178,1149 }, { 1128,1109 } };

  for (irow=row=0; irow < height; irow++) {
    if ((int)fread (data, 1, raw_width*5/4, ifp) < raw_width*5/4) derror();
    for (dp=data, pix=pixel; dp < data+1120; dp+=10, pix+=8) {
      pix[0] = (dp[0] << 2) + (dp[1] >> 6    );
      pix[1] = (dp[2] << 2) + (dp[1] >> 4 & 3);
      pix[2] = (dp[3] << 2) + (dp[1] >> 2 & 3);
      pix[3] = (dp[4] << 2) + (dp[1]      & 3);
      pix[4] = (dp[5] << 2) + (dp[9]      & 3);
      pix[5] = (dp[6] << 2) + (dp[9] >> 2 & 3);
      pix[6] = (dp[7] << 2) + (dp[9] >> 4 & 3);
      pix[7] = (dp[8] << 2) + (dp[9] >> 6    );
    }
    for (col=0; col < width; col++)
      BAYER(row,col) = pixel[col];
    for (col=width; col < raw_width; col++)
      black += pixel[col];
    if ((row+=2) > height) row = 1;
  }
  if (raw_width > width)
    black = black / ((raw_width - width) * height) - 4;
  for (row=0; row < height; row++)
    for (col=0; col < width; col++) {
      if ((val = BAYER(row,col) - black) < 0) val = 0;
      val = val * mul[row & 3][col & 1] >> 9;
      BAYER(row,col) = val;
    }
  canon_600_fixed_wb(1311);
  canon_600_auto_wb();
  canon_600_coeff();
  maximum = (0x3ff - black) * 1109 >> 9;
  black = 0;
}

void CLASS canon_600_load_raw()
{
  uchar  data[1120], *dp;
  ushort pixel[896], *pix;
  int irow, row, col, val;
  static const short mul[4][2] =
  { { 1141,1145 }, { 1128,1109 }, { 1178,1149 }, { 1128,1109 } };

  for (irow=row=0; irow < height; irow++) {
    if ((int)fread (data, 1, raw_width*5/4, ifp) < raw_width*5/4) derror();
    for (dp=data, pix=pixel; dp < data+1120; dp+=10, pix+=8) {
      pix[0] = (dp[0] << 2) + (dp[1] >> 6    );
      pix[1] = (dp[2] << 2) + (dp[1] >> 4 & 3);
      pix[2] = (dp[3] << 2) + (dp[1] >> 2 & 3);
      pix[3] = (dp[4] << 2) + (dp[1]      & 3);
      pix[4] = (dp[5] << 2) + (dp[9]      & 3);
      pix[5] = (dp[6] << 2) + (dp[9] >> 2 & 3);
      pix[6] = (dp[7] << 2) + (dp[9] >> 4 & 3);
      pix[7] = (dp[8] << 2) + (dp[9] >> 6    );
    }
    for (col=0; col < width; col++)
      BAYER(row,col) = pixel[col];
    for (col=width; col < raw_width; col++)
      black += pixel[col];
    if ((row+=2) > height) row = 1;
  }
  if (raw_width > width)
    black = black / ((raw_width - width) * height) - 4;
  for (row=0; row < height; row++)
    for (col=0; col < width; col++) {
      if ((val = BAYER(row,col) - black) < 0) val = 0;
      val = val * mul[row & 3][col & 1] >> 9;
      BAYER(row,col) = val;
    }
  canon_600_fixed_wb(1311);
  canon_600_auto_wb();
  canon_600_coeff();
  maximum = (0x3ff - black) * 1109 >> 9;
  black = 0;
}
