87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
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// NES ROM data loaded into memory
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// Nes_Emu 0.5.6. Copyright (C) 2004-2005 Shay Green. GNU LGPL license.
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#ifndef NES_ROM_H
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#define NES_ROM_H
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#include "blargg_common.h"
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#include "abstract_file.h"
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class Nes_Rom {
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typedef BOOST::uint8_t byte;
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public:
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Nes_Rom();
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~Nes_Rom();
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// Load iNES ROM file
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blargg_err_t load_ines_rom( Data_Reader& );
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// Load iNES ROM file and apply IPS patch
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blargg_err_t load_patched_ines_rom( Data_Reader&, Data_Reader& ips_patch );
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// to do: support UNIF?
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// True if a ROM is currently loaded
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bool loaded() const { return prg_ != NULL; }
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// Free any loaded ROM data
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void reset();
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// True if ROM claims to have battery-backed memory
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bool has_battery_ram() const;
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// Size of PRG data
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long prg_size() const { return prg_size_; }
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// Size of CHR data
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long chr_size() const { return chr_size_; }
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// Change size of PRG (code) data
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blargg_err_t resize_prg( long );
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// Change size of CHR (graphics) data
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blargg_err_t resize_chr( long );
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// Set mapper and information bytes. LSB and MSB are the standard iNES header
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// bytes at offsets 6 and 7.
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void set_mapper( int mapper_lsb, int mapper_msb );
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// Initial mirroring setup
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int mirroring() const { return mapper & 0x09; }
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// iNES mapper code
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int mapper_code() const;
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// Pointer to beginning of PRG data
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byte * prg() { return prg_; }
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byte const* prg() const { return prg_; }
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// Pointer to beginning of CHR data
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byte * chr() { return chr_; }
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byte const* chr() const { return chr_; }
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// End of public interface
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private:
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enum { bank_size = 8 * 1024L }; // bank sizes must be a multiple of this
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byte* prg_;
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byte* chr_;
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long prg_size_;
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long chr_size_;
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unsigned mapper;
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long round_to_bank_size( long n );
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};
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inline bool Nes_Rom::has_battery_ram() const { return mapper & 0x02; }
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inline void Nes_Rom::set_mapper( int mapper_lsb, int mapper_msb )
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{
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mapper = mapper_msb * 0x100 + mapper_lsb;
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}
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inline int Nes_Rom::mapper_code() const { return ((mapper >> 8) & 0xf0) | ((mapper >> 4) & 0x0f); }
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#endif
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