struct block1 {
    char version[64];
    char comments[128];
    char dummy[8];            
    long img_param_flag;      
    long img_data_type;       
    float invalid_point;      
    long  arr_width;           
    long  arr_height;          
    long  db_length;           
    long scale;               
    float iscale;             
    float jscale;
    long trns_matrix_f;       
    double trns_matrix[16];   
    long img_color;           
    long clr_blk_length;      
    long cam_pos_f;           
    float cam_x;
    float cam_y;
    float cam_z;
} *blk1;