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// Common aspects of emulators which use rom data
// Game_Music_Emu 0.5.2
#ifndef ROM_DATA_H
#define ROM_DATA_H
#include "blargg_common.h"
#include "blargg_source.h"
// ROM data handler, used by several Classic_Emu derivitives. Loads file data
// with padding on both sides, allowing direct use in bank mapping. The main purpose
// is to allow all file data to be loaded with only one read() call (for efficiency).
extern const char gme_wrong_file_type []; // declared in gme.h
enum { pad_extra = 8 };
enum { max_bank_size = 0x4000 };
enum { max_pad_size = max_bank_size + pad_extra };
enum { max_rom_size = 2 * max_pad_size };
struct Rom_Data {
byte* file_data;
unsigned file_size;
int rom_addr;
int bank_size;
int rom_size;
unsigned pad_size;
int mask;
int size; // TODO: eliminate
int rsize_;
// Unmapped space
byte unmapped [max_rom_size];
};
// Initialize rom
static inline void Rom_init( struct Rom_Data* this, int bank_size )
{
this->bank_size = bank_size;
this->pad_size = this->bank_size + pad_extra;
this->rom_size = 2 * this->pad_size;
}
// Load file data, using already-loaded header 'h' if not NULL. Copy header
// from loaded file data into *out and fill unmapped bytes with 'fill'.
blargg_err_t Rom_load( struct Rom_Data* this, const void* data, long size, int header_size, void* header_out, int fill );
// Set address that file data should start at
void Rom_set_addr( struct Rom_Data* this, int addr );
// Mask address to nearest power of two greater than size()
static inline int mask_addr( int addr, int mask )
{
#ifdef check
check( addr <= mask );
#endif
return addr & mask;
}
// Pointer to page starting at addr. Returns unmapped() if outside data.
static inline byte* Rom_at_addr( struct Rom_Data* this, int addr )
{
unsigned offset = mask_addr( addr, this->mask ) - this->rom_addr;
if ( offset > (unsigned) (this->rsize_ - this->pad_size) )
offset = 0; // unmapped
if ( offset < this->pad_size ) return &this->unmapped [offset];
else return &this->file_data [offset - this->pad_size];
}
#ifndef GME_APU_HOOK
#define GME_APU_HOOK( emu, addr, data ) ((void) 0)
#endif
#ifndef GME_FRAME_HOOK
#define GME_FRAME_HOOK( emu ) ((void) 0)
#else
#define GME_FRAME_HOOK_DEFINED 1
#endif
#endif
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