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