RLWW bs2 stuff.c

// Updated (far after the fact) for 2019-09-20 #dolphin-emu conversation about me getting regions > 3 wrong
BS2State BS2StateMachine(void) {
  switch (BS2State) {
  // ...
  case BS2 38 Wait game partition, check region: // 8137e4bc in 4.3U
    bVar7 = BS2CacheDatHelper();
    if (bVar7 == false) break;
    tmd_ptr = &tmd_8108c4a0;
    DebugLog(s_TMD_ver_..._0x%02X_8164654a,(uint)tmd_8108c4a0.version);
    DebugLog(s_CA_CRL_ver_..._0x%02X_81646565,(uint)tmd_ptr->ca_crl_version);
    DebugLog(s_Signer_CRL_ver_..._0x%02X_81646580,(uint)tmd_ptr->signer_crl_version);
    DebugLog(s_Req_sys_ver_..._0x%08X%08X_8164659b,*(undefined4 *)&tmd_ptr->system_version,
             *(undefined4 *)&(tmd_ptr->system_version).day);
    DebugLog(s_Title_ID_..._0x%08X%08X_816465ba,tmd_ptr->titleid1,tmd_ptr->titleid2);
    titleid_81698a88.type = *(uint *)&tmd_ptr->system_version;
    titleid_81698a88.code = *(uint *)&(tmd_ptr->system_version).day;
    uVar11 = tmd_ptr->titleid2;
    if ((*(uint *)&(tmd_ptr->system_version).day ^ 0x10 | *(uint *)&tmd_ptr->system_version ^ 1) ==
        0) {
      DAT_81698a84 = uVar11;
      DebugLog(s_This_must_be_a_backup_disk_816466ca);
      BS2State = BS2 57 FatalError;
      break;
    }
    DAT_81698a84 = uVar11;
    memset(gameIDChars,0,4);
    firstIDChar_ = uVar11 >> 0x18;
    gameIDChars[3] = (char)uVar11;
    gameIDChars[0] = (char)(uVar11 >> 0x18);
    if (firstIDChar_ < 'R') {
      if (firstIDChar_ != 'D') goto LAB_8137e5c4;
LAB_8137e5cc:
      if (gameIDChars[3] == 'A') {
        isRegionValid = true;
        goto figuredOutRegionIDValidity;
      }
      GVar6 = LookupGameRegionID();
      gameRegionID = (GameRegionID)GVar6;
      if (gameRegionID == INVALID_3) goto regionIDMismatch;
      if ('\x02' < (char)gameRegionID) {
        if (gameRegionID == CN) { // 8137e6e4
          if (gameIDChars[3] != 'C') goto regionIDMismatch;
                    /* China(!?) gets gameids ending in 'C' */
          isRegionValid = true;
        }
        else {
          if (('\x04' < (char)gameRegionID) || (gameIDChars[3] != 'K')) goto regionIDMismatch;
                    /* Region 4, korea, needs 'K' */
          isRegionValid = true;
        }
        goto figuredOutRegionIDValidity;
      }
      if (gameRegionID == US) {
        if ((byte)gameIDChars[3] < 0x58) {
          if (gameIDChars[3] == 'E') {
regionOKForUS:
                    /* US gets 'E' and also 0x58/0x59/0x5a,
                       i.e. 'X'/'Y'/'Z' */
            isRegionValid = true;
            goto figuredOutRegionIDValidity;
          }
        }
        else {
          if ((byte)gameIDChars[3] < 0x5b) goto regionOKForUS;
        }
regionIDMismatch:
        isRegionValid = false;
      }
      else {
        if ((char)gameRegionID < '\x01') {
          if ((-1 < (char)gameRegionID) &&
             ((gameIDChars[3] == 'W' || (((byte)gameIDChars[3] < 0x57 && (gameIDChars[3] == 'J')))))
             ) {
                    /* Region 0, japan, gets 'W' and 'J' */
            isRegionValid = true;
            goto figuredOutRegionIDValidity;
          }
          goto regionIDMismatch;
        }
        if (false) goto regionIDMismatch;
        switch(gameIDChars[3]) {
        case 'D':
        case 'F':
        case 'H':
        case 'I':
        case 'P':
        case 'R':
        case 'S':
        case 'U':
        case 'V':
        case 'X':
        case 'Y':
        case 'Z':
                    /* Region 2, europe, gets a bunch:
                       DFHIPRSUVXYZ */
          isRegionValid = true;
          break;
        case 'W': // 8137e698
                    /* RLWW seems to have been shoehorned into europe, even though W is normally
                       invalid.
                       
                       https://wiki.dolphin-emu.org/index.php?title=RLWW78 */
          firstIDChar_ = uVar11 >> 0x10 & 0xff;
          uVar11 = uVar11 >> 8 & 0xff;
          gameIDChars[1] = (char)firstIDChar_;
          gameIDChars[2] = (char)uVar11;
          if (((gameIDChars[0] != 'R') || (firstIDChar_ != 'L')) || (uVar11 != 'W'))
          goto regionIDMismatch;
          isRegionValid = true;
          break;
        default:
          goto regionIDMismatch;
        }
      }
    }
    else {
      if (firstIDChar_ < 'U') goto LAB_8137e5cc;
LAB_8137e5c4:
      isRegionValid = true;
    }
figuredOutRegionIDValidity:
    if (!isRegionValid) {
      regionOK = false;
      BS2State = BS2 47 Close game partition;
      break;
    }
    regionOK = true;
    BS2State = BS2 39 Read apploader header from cache; // 8137e728
    // ...
  }
  return BS2State;
}

Table of GameRegions

                             GameRegion_ARRAY_81687440[0].name[0]            XREF[1,2]:   LookupGameRegionID:8156ac78(R), 
                             GameRegion_ARRAY_81687440[1].id                              LookupGameRegionID:8156ac58(*), 
                             GameRegion_ARRAY_81687440                                    LookupGameRegionID:8156ac78(R)  
        81687440 00 4a 50        GameRegi
                 00 01 55 
                 53 00 02 
           81687440 00 4a 50 00     GameRegion                        [0]                               XREF[1,1]:   LookupGameRegionID:8156ac78(R), 
                                                                                                                     LookupGameRegionID:8156ac58(*)  
              81687440 00              GameRegi  JP                      id            Japan               XREF[1]:     LookupGameRegionID:8156ac78(R)  
              81687441 4a 50 00        char[3]   "JP"                    name                              XREF[1]:     LookupGameRegionID:8156ac58(*)  
           81687444 01 55 53 00     GameRegion                        [1]                               XREF[1]:     LookupGameRegionID:8156ac78(R)  
              81687444 01              GameRegi  US                      id            US                  XREF[1]:     LookupGameRegionID:8156ac78(R)  
              81687445 55 53 00        char[3]   "US"                    name
           81687448 02 45 55 00     GameRegion                        [2]
              81687448 02              GameRegi  EU                      id            Europe
              81687449 45 55 00        char[3]   "EU"                    name
           8168744c 04 4b 52 00     GameRegion                        [3]
              8168744c 04              GameRegi  KO                      id            Korea
              8168744d 4b 52 00        char[3]   "KR"                    name
           81687450 05 43 4e 00     GameRegion                        [4]
              81687450 05              GameRegi  CN                      id            China
              81687451 43 4e 00        char[3]   "CN"                    name
           81687454 ff 00 00 00     GameRegion                        [5]
              81687454 ff              GameRegi  END                     id            END
              81687455 00 00 00        char[3]   ""                      name