Bitmap loading problem

    

int Bitmap::Load(const char *filename)
{
	int file_handle,  // the file handle

		index;        // looping index


	UCHAR   *temp_buffer = NULL; // used to convert 24 bit images to 16 bit

	OFSTRUCT file_data;          // the file data information


	// open the file if it exists

	if ((file_handle = OpenFile(filename,&file_data,OF_READ))==-1)
		return 0;

	// now load the bitmap file header

	_lread(file_handle, &bitmapfileheader,sizeof(BITMAPFILEHEADER));

	// test if this is a bitmap file

	if (bitmapfileheader.bfType!=BITMAP_ID)
	{
		// close the file

		_lclose(file_handle);

	   // return error

		return -1;
	} // end if


	// now we know this is a bitmap, so read in all the sections


	// first the bitmap infoheader


	// now load the bitmap file header

	_lread(file_handle, &bitmapinfoheader,sizeof(BITMAPINFOHEADER));

	// now load the color palette if there is one

	if (bitmapinfoheader.biBitCount == 8)
	{
		_lread(file_handle, &palette,MAX_COLORS_PALETTE*sizeof(PALETTEENTRY));

		// now set all the flags in the palette correctly and fix the reversed 

		// BGR RGBQUAD data format

		for (index=0; index < MAX_COLORS_PALETTE; index++)
		{	
			// reverse the red and green fields

			int temp_color        = palette[index].peRed;
			palette[index].peRed  = palette[index].peBlue;
			palette[index].peBlue = temp_color;
       
			// always set the flags word to this

			palette[index].peFlags = PC_NOCOLLAPSE;
		} // end for index


	} // end if


	// finally the image data itself

	_lseek(file_handle,-(int)(bitmapinfoheader.biSizeImage),SEEK_END);

	// now read in the image, if the image is 8 or 16 bit then simply read it

	// but if its 24 bit then read it into a temporary area and then convert

	// it to a 16 bit image


	if (bitmapinfoheader.biBitCount==8 || bitmapinfoheader.biBitCount==16 || 
		bitmapinfoheader.biBitCount==24)
	{
		// delete the last image if there was one

		if (buffer)
			free(buffer);

		// allocate the memory for the image

		if (!(buffer = (UCHAR *)malloc(bitmapinfoheader.biSizeImage)))
		{
			// close the file

			_lclose(file_handle);

			// return error

			return -3;
		} // end if


		// now read it in

		_lread(file_handle,buffer,bitmapinfoheader.biSizeImage);

	} // end if

	else
	{
		// serious problem

		return -4;
	} // end else


	// close the file

	_lclose(file_handle);

	// flip the bitmap

	Flip(bitmapinfoheader.biWidth*(bitmapinfoheader.biBitCount/8), 
		 bitmapinfoheader.biHeight);

	width = bitmapinfoheader.biWidth;
	height = bitmapinfoheader.biHeight;

		// return success

	return 1;
}