Simple decoder/encoder for MNG animations

/*
 * File:	ximabmp.h
 * Purpose:	BMP Image Class Loader and Writer
 */
/* === C R E D I T S  &  D I S C L A I M E R S ==============
 * CxImageBMP (c) 07/Aug/2001 <ing.davide.pizzolato@libero.it>
 * Permission is given by the author to freely redistribute and include
 * this code in any program as long as this credit is given where due.
 *
 * version 1.20 15/Oct/2001
 * See the file history.htm for the complete bugfix and news report.
 *
 * Special thanks to Troels Knakkergaard for new features, enhancements and bugfixes
 *
 * original CImageBMP  and CImageIterator implementation are:
 * Copyright:	(c) 1995, Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
 *
 * COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
 * OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
 * THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
 * CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
 * THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
 * SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
 * PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.
 *
 * Use at your own risk!
 * ==========================================================
 */

#if !defined(__ximaBMP_h)
#define __ximaBMP_h

#include "ximage.h"
#include <stdio.h>

#if CXIMAGE_SUPPORT_BMP

typedef LPBITMAPINFOHEADER PDIB;

class CxImageBMP: public CxImage
{
public:
	CxImageBMP::CxImageBMP() : CxImage(CXIMAGE_FORMAT_BMP) {};
//	bool ReadFile(const char * imageFileName){ return CxImage::ReadFile(imageFileName,CXIMAGE_FORMAT_BMP);}
//	bool SaveFile(const char * imageFileName){ return CxImage::SaveFile(imageFileName,CXIMAGE_FORMAT_BMP);}
	bool Decode(FILE * hFile);
	bool Encode(FILE * hFile);
protected:
	bool DibReadBitmapInfo(FILE* fh,PDIB pdib);
};

#define BFT_ICON   0x4349   /* 'IC' */
#define BFT_BITMAP 0x4d42   /* 'BM' */
#define BFT_CURSOR 0x5450   /* 'PT' */

#define WIDTHBYTES(i)           ((unsigned)((i+31)&(~31))/8)  /* ULONG aligned ! */

#define DibWidth(lpbi)          (UINT)(((LPBITMAPINFOHEADER)(lpbi))->biWidth)
#define DibHeight(lpbi)         (UINT)(((LPBITMAPINFOHEADER)(lpbi))->biHeight)
#define DibBitCount(lpbi)       (UINT)(((LPBITMAPINFOHEADER)(lpbi))->biBitCount)
#define DibCompression(lpbi)    (DWORD)(((LPBITMAPINFOHEADER)(lpbi))->biCompression)

#define DibWidthBytesN(lpbi, n) (UINT)WIDTHBYTES((UINT)(lpbi)->biWidth * (UINT)(n))
#define DibWidthBytes(lpbi)     DibWidthBytesN(lpbi, (lpbi)->biBitCount)

#define DibSizeImage(lpbi)      ((lpbi)->biSizeImage == 0 \
                                    ? ((DWORD)(UINT)DibWidthBytes(lpbi) * (DWORD)(UINT)(lpbi)->biHeight) \
                                    : (lpbi)->biSizeImage)

#define DibSize(lpbi)           ((lpbi)->biSize + (lpbi)->biSizeImage + (int)(lpbi)->biClrUsed * sizeof(RGBQUAD))
//#define DibPaletteSize(lpbi)    (DibNumColors(lpbi) * sizeof(RGBQUAD))

#define DibFlipY(lpbi, y)       ((int)(lpbi)->biHeight-1-(y))

#define DibColors(lpbi)         ((RGBQUAD FAR *)((LPBYTE)(lpbi) + (int)(lpbi)->biSize))
#define DibNumColors(lpbi)      ((lpbi)->biClrUsed == 0 && (lpbi)->biBitCount <= 8 \
                                    ? (int)(1 << (int)(lpbi)->biBitCount)          \
                                    : (int)(lpbi)->biClrUsed)

#define FixBitmapInfo(lpbi)     if ((lpbi)->biSizeImage == 0)                 \
												(lpbi)->biSizeImage = DibSizeImage(lpbi); \
                                if ((lpbi)->biClrUsed == 0)                   \
                                    (lpbi)->biClrUsed = DibNumColors(lpbi);   \
//HACK for NT BI_BITFIELDS DIBs
#ifdef WIN32
    #define DibPtr(lpbi)            ((lpbi)->biCompression == BI_BITFIELDS \
                                       ? (LPVOID)(DibColors(lpbi) + 3) \
                                       : (LPVOID)(DibColors(lpbi) + (UINT)(lpbi)->biClrUsed))
#else
	 #define DibPtr(lpbi)            (LPVOID)(DibColors(lpbi) + (UINT)(lpbi)->biClrUsed)
#endif


#endif

#endif