// BMP.h
// extracts/inserts data from/into .bmp file
// Adapted by Josh Holtrop from the original access_bmp.c by gw
// Supports reading and creating 24-bit color BMP images

#include <stdio.h>

#define BMP_RED 2
#define BMP_GREEN 1
#define BMP_BLUE 0

class BMP
{
public:
    typedef struct
    {
        char id[2]; 
        int file_size;
        int reserved;
        int offset;
    } __attribute__ ((packed)) header_t;

    typedef struct
    {
        int header_size;
        int width;
        int height; 
        unsigned short int color_planes; 
        unsigned short int color_depth; 
        unsigned int compression; 
        int image_size;
        int xresolution;
        int yresolution; 
        int num_colors;
        int num_important_colors;
    } __attribute__ ((packed)) info_t;

    BMP(const char * fileName);
    BMP(const char * fileName, int width, int height, unsigned char * data);
    ~BMP();
    void    read(unsigned char * buf);
    int     getWidth() { return m_info.width; }
    int     getHeight() { return m_info.height; }

protected:
    FILE *      m_fp;
    header_t    m_header;
    info_t      m_info;

    bool    open(const char * fileName);
    bool    create(const char * fileName, int width, int height,
                   unsigned char * data);
    void    close();
};