started tweaking with stuff

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+/*
+ * Pokemon Gen III Data Extractor by hatkirby 2017.
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ *
+ */
+#include "gamedata.h"
+
+void decryptSaveStructures(
+    pSaveBlock1 SaveBlock1,
+    pSaveBlock2 SaveBlock2,
+    pSaveBlock3 SaveBlock3)
+{
+  if (GAME_RS)
+  {
+    // R/S doesn't have save crypto.
+    return;
+  }
+
+  u8* sb1raw = (u8*)SaveBlock1;
+  u8* sb2raw = (u8*)SaveBlock2;
+  //u8* sb3raw = (u8*)SaveBlock3; // unused
+
+  u32* xor_key_ptr = (u32*)(&sb2raw[( GAME_EM ? 0xA8 : 0xF20 )]);
+
+  u32 xor_key = *xor_key_ptr;
+  u16 xor_key16 = (u16)xor_key;
+  if (!xor_key)
+  {
+    // xor key is zero, nothing needs to be done.
+    return;
+  }
+
+  u32* ptr_to_xor;
+  u32 save_offset;
+  int i;
+  u32* bag_pocket_offsets;
+  u32* bag_pocket_counts;
+  if (GAME_FRLG)
+  {
+    // loop over and decrypt various things
+    save_offset = 0x3D38 + 4;
+    for (i = 3; i >= 0; i--)
+    {
+      ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+      *ptr_to_xor ^= xor_key;
+      save_offset += 12;
+    }
+
+    for (i = 0; i <= 0x3f; i++)
+    {
+      save_offset = 0x1200 + (i*sizeof(u32));
+      ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+      *ptr_to_xor ^= xor_key;
+    }
+
+    // loop over each of the bag pockets and decrypt decrypt decrypt
+    bag_pocket_offsets = (u32[5]) { 0x310, 0x388, 0x430, 0x464, 0x54C };
+    bag_pocket_counts = (u32[5]) { 42, 30, 13, 58, 43 };
+
+    for (i = 0; i < 5; i++)
+    {
+      for (int bag_i = 0; bag_i < bag_pocket_counts[i]; bag_i++)
+      {
+        save_offset = bag_pocket_offsets[i] + (sizeof(u32) * bag_i) + 2;
+        *(u16*)(&sb1raw[save_offset]) ^= xor_key16;
+      }
+    }
+
+    // decrypt some more stuff
+    save_offset = 0xaf8;
+    ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+    *ptr_to_xor ^= xor_key;
+
+    save_offset = 0x290;
+    ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+    *ptr_to_xor ^= xor_key;
+
+    save_offset = 0x294;
+    *(u16*)(&sb1raw[save_offset]) ^= xor_key16;
+  } else {
+    // Emerald
+
+    // loop over and decrypt various things
+    for (i = 0; i <= 0x3f; i++)
+    {
+      save_offset = 0x159c + (i*sizeof(u32));
+      ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+      *ptr_to_xor ^= xor_key;
+    }
+
+    // loop over each of the bag pockets and decrypt decrypt decrypt
+    bag_pocket_offsets = (u32[5]) { 0x560, 0x5D8, 0x650, 0x690, 0x790 };
+    bag_pocket_counts = (u32[5]) { 30, 30, 16, 64, 46 };
+
+    for (i = 0; i < 5; i++)
+    {
+      for (int bag_i = 0; bag_i < bag_pocket_counts[i]; bag_i++)
+      {
+        save_offset = bag_pocket_offsets[i] + (sizeof(u32) * bag_i) + 2;
+        *(u16*)(&sb1raw[save_offset]) ^= xor_key16;
+      }
+    }
+
+    // decrypt some more stuff
+    save_offset = 0x1F4;
+    ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+    *ptr_to_xor ^= xor_key;
+
+    save_offset = 0x490;
+    ptr_to_xor = (u32*)(&sb1raw[save_offset]);
+    *ptr_to_xor ^= xor_key;
+
+    save_offset = 0x494;
+    *(u16*)(&sb1raw[save_offset]) ^= xor_key16;
+  }
+
+  *xor_key_ptr = 0;
+}
+
+bool initSaveData(
+    pSaveBlock1* SaveBlock1,
+    pSaveBlock2* SaveBlock2,
+    pSaveBlock3* SaveBlock3)
+{
+  // check the ROM code, make sure this game is supported.
+  u8* ROM = (u8*) 0x8000000;
+
+  u32 gamecode = (*(u32*)(&ROM[0xAC]));
+
+  void(*loadsave)(char a1);
+  //void(*mainloop)();
+  //void(*load_pokemon)();
+  pSaveBlock1 gSaveBlock1;
+  pSaveBlock2 gSaveBlock2;
+  pSaveBlock3 gSaveBlock3;
+  //u32 titlemid = 0;
+
+  // get the address of the save loading function.
+  switch (gamecode)
+  {
+    // --- R/S ---
+    case 'DVXA': // Ruby German
+    case 'DPXA': // Sapphire German
+    {
+      // TODO: detect debug ROM?
+      gSaveBlock1 = (pSaveBlock1) 0x2025734;
+      gSaveBlock2 = (pSaveBlock2) 0x2024EA4;
+      gSaveBlock3 = (pSaveBlock3) 0x20300A0;
+      loadsave = (void(*)(char)) 0x8126249; // same for v1.0 + v1.1
+      //mainloop = (void(*)()) 0x80003D9;
+      //load_pokemon = (void(*)()) 0x8047da9;
+
+      break;
+    }
+
+    case 'FVXA': // Ruby French
+    case 'FPXA': // Sapphire French
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025734;
+      gSaveBlock2 = (pSaveBlock2) 0x2024EA4;
+      gSaveBlock3 = (pSaveBlock3) 0x20300A0;
+      loadsave = (void(*)(char)) 0x8126351; // same for v1.0 + v1.1
+      //mainloop = (void(*)()) 0x80003D9;
+      //load_pokemon = (void(*)()) 0x8047e95;
+
+      break;
+    }
+
+    case 'IVXA': // Ruby Italian
+    case 'IPXA': // Sapphire Italian
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025734;
+      gSaveBlock2 = (pSaveBlock2) 0x2024EA4;
+      gSaveBlock3 = (pSaveBlock3) 0x20300A0;
+      loadsave = (void(*)(char)) 0x8126249; // same for v1.0 + v1.1
+      //mainloop = (void(*)()) 0x80003D9;
+      //load_pokemon = (void(*)()) 0x8047dbd;
+
+      break;
+    }
+
+    case 'SVXA': // Ruby Spanish
+    case 'SPXA': // Sapphire Spanish
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025734;
+      gSaveBlock2 = (pSaveBlock2) 0x2024EA4;
+      gSaveBlock3 = (pSaveBlock3) 0x20300A0;
+      loadsave = (void(*)(char)) 0x8126349; // same for v1.0 + v1.1
+      //mainloop = (void(*)()) 0x80003D9;
+      //load_pokemon = (void(*)()) 0x8047ea5;
+
+      break;
+    }
+
+    case 'EVXA': // Ruby English
+    case 'EPXA': // Sapphire English
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025734;
+      gSaveBlock2 = (pSaveBlock2) 0x2024EA4;
+      gSaveBlock3 = (pSaveBlock3) 0x20300A0;
+      //mainloop = (void(*)()) 0x80002A5;
+
+      // version number
+      switch (ROM[0xBC])
+      {
+        case 0:
+        {
+          loadsave = (void(*)(char)) 0x8125EC9;
+          //load_pokemon = (void(*)()) 0x8047a85;
+
+          break;
+        }
+
+        case 1:
+        case 2:
+        {
+          loadsave = (void(*)(char)) 0x8125EE9;
+          //load_pokemon = (void(*)()) 0x8047aa5;
+
+          break;
+        }
+
+        default:
+        {
+          return false; // unsupported version
+        }
+      }
+
+      break;
+    }
+
+    case 'JVXA': // Ruby Japanese
+    case 'JPXA': // Sapphire Japanese
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025494;
+      gSaveBlock2 = (pSaveBlock2) 0x2024C04;
+      gSaveBlock3 = (pSaveBlock3) 0x202FDBC;
+      loadsave = (void(*)(char)) 0x8120d05; // same for v1.0 + v1.1
+      //mainloop = (void(*)()) 0x80002A9;
+      //load_pokemon = (void(*)()) 0x8044d55;
+
+      break;
+    }
+
+    /// --- FR/LG ---
+    // In FR/LG, the function that initialises the save-block pointers to default does not set up saveblock3.
+    // Which will need to be set up before loading the save if we want boxed Pokémon to not disappear.
+    // Oh, and loadsave() offset is different between FR and LG...
+
+    case 'DRPB': // FireRed German
+    case 'DGPB': // LeafGreen German
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202552C;
+      gSaveBlock2 = (pSaveBlock2) 0x2024588;
+      gSaveBlock3 = (pSaveBlock3) 0x2029314;
+      *(pSaveBlock3*)(0x3004f60) = gSaveBlock3;
+      loadsave = (void(*)(char)) ( GAME_FR ? 0x80da721 : 0x80da6f5 );
+      //mainloop = (void(*)()) 0x8000425;
+      //titlemid = 0x80791df;
+      //load_pokemon = (void(*)()) 0x804c251;
+
+      break;
+    }
+
+    case 'FRPB': // FireRed French
+    case 'FGPB': // LeafGreen French
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202552C;
+      gSaveBlock2 = (pSaveBlock2) 0x2024588;
+      gSaveBlock3 = (pSaveBlock3) 0x2029314;
+      *(pSaveBlock3*)(0x3004f60) = gSaveBlock3;
+      loadsave = (void(*)(char)) ( GAME_FR ? 0x80da7e1 : 0x80da7b5 );
+      //mainloop = (void(*)()) 0x8000417;
+      //titlemid = 0x807929f;
+      //load_pokemon = (void(*)()) 0x804c311;
+
+      break;
+    }
+
+    case 'IRPB': // FireRed Italian
+    case 'IGPB': // LeafGreen Italian
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202552C;
+      gSaveBlock2 = (pSaveBlock2) 0x2024588;
+      gSaveBlock3 = (pSaveBlock3) 0x2029314;
+      *(pSaveBlock3*)(0x3004f60) = gSaveBlock3;
+      loadsave = (void(*)(char)) ( GAME_FR ? 0x80da721 : 0x80da6f5 );
+      //mainloop = (void(*)()) 0x8000425;
+      //titlemid = 0x80791cb;
+      //load_pokemon = (void(*)()) 0x804c23d;
+
+      break;
+    }
+
+    case 'SRPB': // FireRed Spanish
+    case 'SGPB': // LeafGreen Spanish
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202552C;
+      gSaveBlock2 = (pSaveBlock2) 0x2024588;
+      gSaveBlock3 = (pSaveBlock3) 0x2029314;
+      *(pSaveBlock3*)(0x3004f60) = gSaveBlock3;
+      loadsave = (void(*)(char)) ( GAME_FR ? 0x80da809 : 0x80da7dd );
+      //mainloop = (void(*)()) 0x8000417;
+      //titlemid = 0x80792b3;
+      //load_pokemon = (void(*)()) 0x804c325;
+
+      break;
+    }
+
+    case 'ERPB': // FireRed English
+    case 'EGPB': // LeafGreen English
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202552C;
+      gSaveBlock2 = (pSaveBlock2) 0x2024588;
+      gSaveBlock3 = (pSaveBlock3) 0x2029314;
+      *(pSaveBlock3*)(0x3005010) = gSaveBlock3;
+
+      // version number
+      switch (ROM[0xBC])
+      {
+        case 0:
+        {
+          loadsave = (void(*)(char)) ( GAME_FR ? 0x80da4fd : 0x80da4d1 );
+          //mainloop = (void(*)()) 0x800041b;
+          //titlemid = 0x807927b;
+          //load_pokemon = (void(*)()) 0x804c231;
+
+          break;
+        }
+
+        case 1:
+        {
+          loadsave = (void(*)(char)) ( GAME_FR ? 0x80da511 : 0x80da4e5 );
+          //mainloop = (void(*)()) 0x8000429;
+          //titlemid = 0x807928f;
+          //load_pokemon = (void(*)()) 0x804c245;
+
+          break;
+        }
+
+        default:
+        {
+          return false; // unsupported version
+        }
+      }
+
+      break;
+    }
+
+    case 'JRPB': // FireRed Japanese
+    case 'JGPB': // LeafGreen Japanese
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x202548C;
+      gSaveBlock2 = (pSaveBlock2) 0x20244E8;
+      gSaveBlock3 = (pSaveBlock3) 0x202924C;
+      *(pSaveBlock3*)(0x3005050) = gSaveBlock3;
+
+      // version number
+      switch (ROM[0xBC])
+      {
+        case 0:
+        {
+          loadsave = (void(*)(char)) ( GAME_FR ? 0x80db4e5 : 0x80db4b9 );
+          //mainloop = (void(*)()) 0x800041b;
+          //titlemid = 0x8078a0f;
+          //load_pokemon = (void(*)()) 0x804b9e9;
+
+          break;
+        }
+
+        case 1:
+        {
+          if ((gamecode << 8) == 'GPB\x00')
+          {
+            // LeafGreen v1.1 Japanese is undumped.
+            // Therefore, it is unsupported.
+            // I will make guesses at the offsets in the comments, but I will not actually implement them until LeafGreen v1.1 is dumped.
+
+            return false;
+          }
+
+          loadsave = (void(*)(char)) 0x80db529; // potential LG1.1 address: 0x80db4fd
+          //mainloop = (void(*)()) 0x8000417;
+          //titlemid = 0x8078987;
+          //load_pokemon = (void(*)()) 0x804b9c5;
+
+          break;
+        }
+
+        default:
+        {
+          return false; // unsupported version
+        }
+      }
+
+      break;
+    }
+
+    /// --- Emerald ---
+    // In Emerald, the saveblock pointer that isn't set up is saveblock1 (in FR/LG it was saveblock3).
+    // The initial save loading code after the copyright screen is also updated, now it sets up ASLR/crypto here before loading the save.
+
+    case 'DEPB': // Emerald German
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025A00;
+      gSaveBlock2 = (pSaveBlock2) 0x2024A54;
+      gSaveBlock3 = (pSaveBlock3) 0x2029808;
+      *(pSaveBlock1*)(0x3005d8c) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x8153075;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x816fdb5;
+      //load_pokemon = (void(*)()) 0x8076dd5;
+
+      break;
+    }
+
+    case 'FEPB': // Emerald French
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025A00;
+      gSaveBlock2 = (pSaveBlock2) 0x2024A54;
+      gSaveBlock3 = (pSaveBlock3) 0x2029808;
+      *(pSaveBlock1*)(0x3005d8c) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x815319d;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x816fedd;
+      //load_pokemon = (void(*)()) 0x8076dd1;
+
+      break;
+    }
+
+    case 'IEPB': // Emerald Italian
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025A00;
+      gSaveBlock2 = (pSaveBlock2) 0x2024A54;
+      gSaveBlock3 = (pSaveBlock3) 0x2029808;
+      *(pSaveBlock1*)(0x3005d8c) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x8153065;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x816fda5;
+      //load_pokemon = (void(*)()) 0x8076dd5;
+
+      break;
+    }
+
+    case 'SEPB': // Emerald Spanish
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025A00;
+      gSaveBlock2 = (pSaveBlock2) 0x2024A54;
+      gSaveBlock3 = (pSaveBlock3) 0x2029808;
+      *(pSaveBlock1*)(0x3005d8c) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x8153175;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x816feb5;
+      //load_pokemon = (void(*)()) 0x8076dd1;
+
+      break;
+    }
+
+    case 'EEPB': // Emerald English
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x2025A00;
+      gSaveBlock2 = (pSaveBlock2) 0x2024A54;
+      gSaveBlock3 = (pSaveBlock3) 0x2029808;
+      *(pSaveBlock1*)(0x3005d8c) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x81534d1;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x817014d;
+      //load_pokemon = (void(*)()) 0x8076dd5;
+
+      break;
+    }
+
+    case 'JEPB': // Emerald Japanese
+    {
+      gSaveBlock1 = (pSaveBlock1) 0x20256A4;
+      gSaveBlock2 = (pSaveBlock2) 0x20246F8;
+      gSaveBlock3 = (pSaveBlock3) 0x20294AC;
+      *(pSaveBlock1*)(0x3005aec) = gSaveBlock1;
+      loadsave = (void(*)(char)) 0x815340d;
+      //mainloop = (void(*)()) 0x800042b;
+      //titlemid = 0x816ff45;
+      //load_pokemon = (void(*)()) 0x80767dd;
+
+      break;
+    }
+
+    default:
+    {
+      return false; // this game isn't supported
+    }
+  }
+
+  loadsave(0);
+
+  // now the save is loaded, we can do what we want with the loaded blocks.
+  // first, we're going to want to decrypt the parts that are crypted, if applicable.
+  decryptSaveStructures(gSaveBlock1,gSaveBlock2,gSaveBlock3);
+
+  *SaveBlock1 = gSaveBlock1;
+  *SaveBlock2 = gSaveBlock2;
+  *SaveBlock3 = gSaveBlock3;
+
+  /*
+  // time to call the payload.
+  payload(gSaveBlock1,gSaveBlock2,gSaveBlock3);
+  // Now, we better call the function that sets the pokemon-related stuff from the structure elements of the loaded save again.
+  // Just in case the payload did something with that.
+  load_pokemon();
+  // In FR/LG/Emerald, just returning to the game is unwise.
+  // The game reloads the savefile.
+  // In FR/LG, this is done at the title screen after setting ASLR/saveblock-crypto up. (probably because at initial save-load, SaveBlock3 ptr isn't set up lol)
+  // So, better bypass the title screen and get the game to return directly to the Continue/New Game screen.
+  // In Emerald, the save reload happens after the Continue option was chosen, so we have no choice but to bypass everything and get the game to go straight to the overworld.
+  // Easiest way to do this is to call into the middle of the function we want, using an ASM wrapper to set up the stack.
+  // Here goes...
+  if (titlemid) {
+    // Function reserves an extra 4 bytes of stack space in FireRed/LeafGreen, and none in Emerald.
+    call_into_middle_of_titlescreen_func(titlemid,(GAME_EM ? 0 : 4));
+  }
+  // Now we've done what we want, time to return to the game.
+  // Can't just return, the game will reload the save.
+  // So let's just call the main-loop directly ;)
+  // turn the sound back on before we head back to the game
+  *(vu16 *)(REG_BASE + 0x84) = 0x8f;
+  // re-enable interrupts
+  REG_IME = 1;
+  mainloop();
+  // Anything past here will not be executed.
+  return 0;
+  */
+  return true;
+}