Arcaea Ayu Random Frag

0_Arcaea_Ayu_Random_Frag

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彩梦随机算法ida导出及美化版源码
代码版权 ©lowiro 2018

Fragments random algorithm ida export and prettified source code
Source copyright ©lowiro 2018

formed_CharacterAbilityModifyFragmentRNG::modifyPlayAward.cpp

void CharacterAbilityModifyFragmentRNG::modifyPlayAward(PlayAward *award, GameResult *result)
{
  if ( ArcUtil::calculateScore(/*score calculate parameters*/) >= 5500001 ) {
    int isClearType2Or3 = 0;
    if ( GameResult::getCalculatedClearType(v3) == 2 || GameResult::getCalculatedClearType(v3) == 3) 
      isClearType2Or3 = 1;
    /*
    lran48 generates int from 0 to 2^31
    lran48() * 4.6566e-10 generates float from 0 to 0.99999723552768,
    which is roughly 0 to 1
    */
    float randomVal = (float)((float)lrand48() * 4.6566e-10);
    int modifiedFrag;
    if ( randomVal < 0.0000005 ) {
      modifiedFrag = 9999;
    } else if ( randomVal < 0.00001 ) {
      modifiedFrag = 616;
    } else if ( randomVal < 0.9 ) {
      modifiedFrag = std::uniform_int_distribution(-10, 20);
    } else {
      modifiedFrag = std::uniform_int_distribution(1, 10) * 10;
    }
    if (isClearType2Or3 && modifiedFrag <= 0) {
      modifiedFrag = std::uniform_int_distribution(1, 20);
    }
    award->partner = modifiedFrag;
  }
}

ida_CharacterAbilityModifyFragmentRNG::modifyPlayAward.cpp

int __fastcall CharacterAbilityModifyFragmentRNG::modifyPlayAward(int a1, int playAward, GameResult *gameResult)
{
  GameResult *gameResult_; // r5
  int playAward_; // r6
  signed int isClearType2Or3; // r5
  int clearType; // r0
  double v7; // d0
  int modifiedFrag; // r0
  signed int modifiedFragLessThan1; // r1
  int v11; // [sp+8h] [bp-18h]
  int v12; // [sp+Ch] [bp-14h]
  int v13; // [sp+10h] [bp-10h]

  gameResult_ = gameResult;
  playAward_ = playAward;
  if ( ArcUtil::calculateScore(
         (ArcUtil *)(*((_QWORD *)gameResult_ + 3) >> 32),
         *((_QWORD *)gameResult_ + 3),
         *((_QWORD *)gameResult + 2) >> 32,
         *((_QWORD *)gameResult + 2),
         *((_QWORD *)gameResult_ + 3) + (*((_QWORD *)gameResult_ + 3) >> 32) + (*((_QWORD *)gameResult + 2) >> 32)) >= 5500001 )
  {
    if ( GameResult::getCalculatedClearType(gameResult_) == 2 )
    {
      isClearType2Or3 = 1;
    }
    else
    {
      clearType = GameResult::getCalculatedClearType(gameResult_);
      isClearType2Or3 = 0;
      if ( clearType == 3 )
        isClearType2Or3 = 1;
    }
    v7 = (float)((float)lrand48() * 4.6566e-10);
    if ( v7 >= 0.0000005 )
    {
      if ( v7 >= 0.00001 )
      {
        if ( v7 >= 0.9 )
        {
          v11 = 1;
          v12 = 10;
          cocos2d::RandomHelper::getEngine((cocos2d::RandomHelper *)&byte_9[1]);
          modifiedFrag = 10
                       * std::__ndk1::uniform_int_distribution<int>::operator()<std::__ndk1::mersenne_twister_engine<unsigned int,32u,624u,397u,31u,2567483615u,11u,4294967295u,7u,2636928640u,15u,4022730752u,18u,1812433253u>>();
        }
        else
        {
          v11 = -10;
          v12 = 20;
          cocos2d::RandomHelper::getEngine((cocos2d::RandomHelper *)&dword_14);
          modifiedFrag = std::__ndk1::uniform_int_distribution<int>::operator()<std::__ndk1::mersenne_twister_engine<unsigned int,32u,624u,397u,31u,2567483615u,11u,4294967295u,7u,2636928640u,15u,4022730752u,18u,1812433253u>>();
        }
        modifiedFragLessThan1 = 0;
        if ( modifiedFrag < 1 )
          modifiedFragLessThan1 = 1;
        if ( (modifiedFragLessThan1 & isClearType2Or3) == 1 )
        {
          v11 = 1;
          v12 = 20;
          cocos2d::RandomHelper::getEngine((cocos2d::RandomHelper *)&dword_14);
          modifiedFrag = std::__ndk1::uniform_int_distribution<int>::operator()<std::__ndk1::mersenne_twister_engine<unsigned int,32u,624u,397u,31u,2567483615u,11u,4294967295u,7u,2636928640u,15u,4022730752u,18u,1812433253u>>();
        }
      }
      else
      {
        modifiedFrag = 616;
      }
    }
    else
    {
      modifiedFrag = 9999;
    }
    *(_DWORD *)(playAward_ + 16) = modifiedFrag;
  }
  return _stack_chk_guard - v13;
}