added mappers (not working)

NES Emulator/mapper.h

@@ -0,0 +1,31 @@
+#ifndef _MAPPER_H_
+#define _MAPPER_H_
+
+#include <stdio.h>
+#include "types.h"
+
+struct PPU;
+
+struct Mapper
+{
+	Byte id;
+	void* mapperStruct;
+
+	Byte(*read_cpu)(void*, Word);
+	Byte(*read_ppu)(void*, Word);
+	void(*write_cpu)(void*, Word, Byte);
+	void(*write_ppu)(void*, Word, Byte);
+
+	void(*get_pattern_table_texture)(void*, void*, int);
+};
+
+#define MapperReadCPU(mapper, addr) mapper->read_cpu(mapper->mapperStruct, addr)
+#define MapperReadPPU(mapper, addr) mapper->read_ppu(mapper->mapperStruct, addr)
+#define MapperWriteCPU(mapper, addr, val) mapper->write_cpu(mapper->mapperStruct, addr, val)
+#define MapperWritePPU(mapper, addr, val) mapper->write_ppu(mapper->mapperStruct, addr, val)
+#define GetPatternTableTexture(mapper, texture, index) mapper->get_pattern_table_texture(mapper->mapperStruct, texture, index)
+
+struct Mapper* createMapper(Byte id, Byte prg_rom_size, Byte chr_rom_size, FILE* fp);
+void destroyMapper(struct Mapper* mapper);
+
+#endif // _MAPPER_H_