nese/src/ines.h

#ifndef NESE_INES_H_
#define NESE_INES_H_

#include <stdint.h>


#define INES_TRAINER_SIZE   (0x0200U)
#define INES_PRG_ROM_SIZE   (0x4000U)
#define INES_CHR_ROM_SIZE   (0x2000U)

#define INES_MAGIC "NES\x1a"

typedef enum __attribute__((packed)) {
    ines_Flag_Vert_Mirror   = 0b00000001,
    ines_Flag_Battery       = 0b00000010,
    ines_Flag_Trainer       = 0b00000100,
    ines_Flag_Alt_Nametable = 0b00001000,
    ines_Mapper_Nibble_Lo   = 0b11110000,
} ines_6_Flag;

typedef enum __attribute__((packed)) {
    ines_Console_Mask       = 0b00000011,
    ines_Console_NES        = 0b00000000,
    ines_Console_VS         = 0b00000001,
    ines_Console_PC10       = 0b00000010,
    ines_Console_Ext        = 0b00000011,
    ines_NES_2_MASK         = 0b00001100,
    ines_NES_2_ID           = 0b00001000,
    ines_Mapper_Nibble_Hi   = 0b11110000,
} ines_7_Flag;

typedef struct __attribute__((packed)) {
    char magic[4];
    uint8_t prg_size_lsb;
    uint8_t chr_size_lsb;
    ines_6_Flag flags_6;
    ines_7_Flag flags_7;
    uint8_t prg_ram_size;
    uint8_t tv_system;
    uint8_t flags_10;
    uint8_t padding[5];
} ines_Header;


#endif // NESE_INES_H_