#define MS_CLS 0x00000600 // Mask for typing #define FF_CODE 0x00000600 // Code ? #define FF_DATA 0x00000400 // Data ? #define FF_TAIL 0x00000200 // Tail ? #define FF_UNK 0x00000000 // Unknown ?#define is_code(F) ((F & MS_CLS) == FF_CODE) // is code byte? #define is_data(F) ((F & MS_CLS) == FF_DATA) // is data byte? #define is_tail(F) ((F & MS_CLS) == FF_TAIL) // is tail byte? #define is_unknown(F) ((F & MS_CLS) == FF_UNK) // is unexplored byte? #define is_head(F) ((F & FF_DATA) != 0) // is start of code/data?