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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/libsnes/bsnes/gameboy/cheat/cheat.cpp
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#include <gameboy/gameboy.hpp>

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namespace GameBoy {

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Cheat cheat;

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bool Cheat::decode(const string &code_, unsigned &addr, unsigned &data, unsigned &comp) {

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  static bool initialize = false;

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  static uint8 mapProActionReplay[256], mapGameGenie[256];

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  if(initialize == false) {

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    initialize = true;

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    for(auto &n : mapProActionReplay) n = ~0;

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    mapProActionReplay['0'] =  0; mapProActionReplay['1'] =  1; mapProActionReplay['2'] =  2; mapProActionReplay['3'] =  3;

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    mapProActionReplay['4'] =  4; mapProActionReplay['5'] =  5; mapProActionReplay['6'] =  6; mapProActionReplay['7'] =  7;

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    mapProActionReplay['8'] =  8; mapProActionReplay['9'] =  9; mapProActionReplay['A'] = 10; mapProActionReplay['B'] = 11;

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    mapProActionReplay['C'] = 12; mapProActionReplay['D'] = 13; mapProActionReplay['E'] = 14; mapProActionReplay['F'] = 15;

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    for(auto &n : mapGameGenie) n = ~0;

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    mapGameGenie['0'] =  0; mapGameGenie['1'] =  1; mapGameGenie['2'] =  2; mapGameGenie['3'] =  3;

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    mapGameGenie['4'] =  4; mapGameGenie['5'] =  5; mapGameGenie['6'] =  6; mapGameGenie['7'] =  7;

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    mapGameGenie['8'] =  8; mapGameGenie['9'] =  9; mapGameGenie['A'] = 10; mapGameGenie['B'] = 11;

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    mapGameGenie['C'] = 12; mapGameGenie['D'] = 13; mapGameGenie['E'] = 14; mapGameGenie['F'] = 15;

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  }

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  string code = code_;

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  code.upper();

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  unsigned length = code.length(), bits = 0;

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  if(code.wildcard("????:??")) {

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    code = { substr(code, 0, 4), substr(code, 5, 2) };

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    for(unsigned n = 0; n < 6; n++) if(mapProActionReplay[code[n]] > 15) return false;

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    bits = hex(code);

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    addr = (bits >> 8) & 0xffff;

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    data = (bits >> 0) & 0xff;

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    comp = ~0;

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    return true;

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  }

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  if(code.wildcard("????:??:??")) {

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    code = { substr(code, 0, 4), substr(code, 5, 2), substr(code, 8, 2) };

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    for(unsigned n = 0; n < 8; n++) if(mapProActionReplay[code[n]] > 15) return false;

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    bits = hex(code);

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    addr = (bits >> 16) & 0xffff;

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    data = (bits >>  8) & 0xff;

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    comp = (bits >>  0) & 0xff;

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    return true;

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  }

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  if(code.wildcard("???" "-" "???")) {

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    code = { substr(code, 0, 3), substr(code, 4, 3) };

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    for(unsigned n = 0; n < 6; n++) if(mapGameGenie[code[n]] > 15) return false;

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    for(unsigned n = 0; n < 6; n++) bits |= mapGameGenie[code[n]] << (20 - n * 4);

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    addr = (bits >>  0) & 0xffff;

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    data = (bits >> 16) & 0xff;

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    comp = ~0;

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    addr = (((addr >> 4) | (addr << 12)) & 0xffff) ^ 0xf000;

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    return true;

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  }

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  if(code.wildcard("???" "-" "???" "-" "???")) {

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    code = { substr(code, 0, 3), substr(code, 4, 3), substr(code, 8, 1), substr(code, 10, 1) };

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    for(unsigned n = 0; n < 8; n++) if(mapGameGenie[code[n]] > 15) return false;

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    for(unsigned n = 0; n < 8; n++) bits |= mapGameGenie[code[n]] << (28 - n * 4);

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    addr = (bits >>  8) & 0xffff;

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    data = (bits >> 24) & 0xff;

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    comp = (bits >>  0) & 0xff;

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    addr = (((addr >> 4) | (addr << 12)) & 0xffff) ^ 0xf000;

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    comp = (((comp >> 2) | (comp << 6)) & 0xff) ^ 0xba;

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    return true;

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  }

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  return false;

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}

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void Cheat::synchronize() {

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  for(auto &n : override) n = false;

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  for(unsigned n = 0; n < size(); n++) {

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    override[operator[](n).addr] = true;

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  }

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}

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}

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