char __thiscall sub_1030E680(int this, int a2, int a3)
{
  int v3; // ebp@1
  char result; // al@1
  unsigned __int16 v5; // dx@2
  int v6; // ebx@2
  unsigned __int16 v7; // cx@2
  int v8; // ecx@2
  signed int v9; // esi@2
  int v10; // eax@2
  int v11; // edi@3
  int v12; // edx@4
  int v13; // esi@4
  bool v14; // zf@4
  int v15; // esi@6
  signed int v16; // ebx@6
  int v17; // eax@6
  int v18; // esi@6
  signed int v19; // edx@6
  signed int v20; // edx@6
  signed int v21; // edx@6
  int v22; // [sp+4h] [bp-14h]@2
  int v23; // [sp+8h] [bp-10h]@2
  unsigned int v24; // [sp+Ch] [bp-Ch]@2
  unsigned int v25; // [sp+10h] [bp-8h]@2
  int v26; // [sp+1Ch] [bp+4h]@3

  v3 = this;
  result = *(_BYTE *)(this + 4);
  if ( result )
  {
    LOBYTE(v5) = 0;
    HIBYTE(v5) = *(_BYTE *)(a2 + 2);
    v6 = *(_DWORD *)(this + 8) ^ (*(_BYTE *)(a2 + 3) | v5 | (*(_BYTE *)(a2 + 1) << 16) | (*(_BYTE *)a2 << 24));
    LOBYTE(v7) = 0;
    HIBYTE(v7) = *(_BYTE *)(a2 + 6);
    LOBYTE(v5) = 0;
    HIBYTE(v5) = *(_BYTE *)(a2 + 10);
    v22 = *(_DWORD *)(v3 + 12) ^ (*(_BYTE *)(a2 + 7) | v7 | (*(_BYTE *)(a2 + 5) << 16) | (*(_BYTE *)(a2 + 4) << 24));
    v24 = v6;
    v8 = *(_DWORD *)(v3 + 16) ^ (*(_BYTE *)(a2 + 11) | v5 | (*(_BYTE *)(a2 + 9) << 16) | (*(_BYTE *)(a2 + 8) << 24));
    HIBYTE(v5) = *(_BYTE *)(a2 + 14);
    v25 = v8;
    LOBYTE(v5) = *(_BYTE *)(a2 + 15);
    v9 = *(_DWORD *)(v3 + 976);
    v10 = *(_DWORD *)(v3 + 20) ^ ((*(_BYTE *)(a2 + 13) << 16) | (*(_BYTE *)(a2 + 12) << 24) | v5);
    v23 = *(_DWORD *)(v3 + 20) ^ ((*(_BYTE *)(a2 + 13) << 16) | (*(_BYTE *)(a2 + 12) << 24) | v5);
    if ( v9 > 1 )
    {
      v11 = v3 + 48;
      v26 = v9 - 1;
      do
      {
        v10 = *(_DWORD *)(v11 - 4) ^ dword_103B8210[(unsigned __int8)v6] ^ dword_103B7610[BYTE3(v22)] ^ dword_103B7A10[(unsigned __int8)(v25 >> 16)] ^ dword_103B7E10[BYTE1(v10)];
        v12 = dword_103B8210[(unsigned __int8)v22] ^ dword_103B7E10[BYTE1(v6)] ^ dword_103B7610[BYTE3(v25)] ^ dword_103B7A10[(unsigned __int8)((unsigned int)v23 >> 16)];
        v13 = *(_DWORD *)(v11 + 4) ^ dword_103B8210[(unsigned __int8)v8] ^ dword_103B7A10[BYTE2(v24)] ^ dword_103B7E10[BYTE1(v22)] ^ dword_103B7610[BYTE3(v23)];
        v6 = dword_103B8210[(unsigned __int8)v23] ^ dword_103B7610[BYTE3(v24)] ^ dword_103B7A10[BYTE2(v22)] ^ dword_103B7E10[BYTE1(v8)] ^ *(_DWORD *)(v11 - 8);
        v8 = *(_DWORD *)v11 ^ v12;
        v22 = v10;
        v11 += 32;
        BYTE1(v10) = BYTE1(v13);
        v14 = v26 == 1;
        v24 = v6;
        v25 = v8;
        v23 = v13;
        --v26;
      }
      while ( !v14 );
      v9 = *(_DWORD *)(v3 + 976);
    }
    v15 = 32 * v9;
    v16 = *(_DWORD *)(v15 + v3 + 8);
    v17 = *(_DWORD *)(v15 + v3 + 8);
    v18 = v15 + v3 + 8;
    result = a3;
    *(_BYTE *)a3 = byte_103B7510[v24 >> 24] ^ BYTE3(v17);
    *(_BYTE *)(a3 + 1) = byte_103B7510[(unsigned __int8)((unsigned int)v22 >> 16)] ^ (v16 >> 16);
    *(_BYTE *)(a3 + 2) = byte_103B7510[BYTE1(v8)] ^ BYTE1(v16);
    *(_BYTE *)(a3 + 3) = v16 ^ byte_103B7510[(unsigned __int8)v23];
    v19 = *(_DWORD *)(v18 + 4);
    *(_BYTE *)(a3 + 4) = byte_103B7510[BYTE3(v22)] ^ (*(_DWORD *)(v18 + 4) >> 24);
    *(_BYTE *)(a3 + 5) = byte_103B7510[BYTE2(v25)] ^ (v19 >> 16);
    *(_BYTE *)(a3 + 6) = byte_103B7510[BYTE1(v23)] ^ BYTE1(v19);
    *(_BYTE *)(a3 + 7) = v19 ^ byte_103B7510[(unsigned __int8)v24];
    v20 = *(_DWORD *)(v18 + 8);
    *(_BYTE *)(a3 + 8) = byte_103B7510[BYTE3(v25)] ^ (*(_DWORD *)(v18 + 8) >> 24);
    *(_BYTE *)(a3 + 9) = byte_103B7510[BYTE2(v23)] ^ (v20 >> 16);
    *(_BYTE *)(a3 + 10) = byte_103B7510[BYTE1(v24)] ^ BYTE1(v20);
    *(_BYTE *)(a3 + 11) = v20 ^ byte_103B7510[(unsigned __int8)v22];
    v21 = *(_DWORD *)(v18 + 12);
    *(_BYTE *)(a3 + 12) = byte_103B7510[BYTE3(v23)] ^ BYTE3(v21);
    *(_BYTE *)(a3 + 13) = byte_103B7510[BYTE2(v24)] ^ (v21 >> 16);
    *(_BYTE *)(a3 + 14) = byte_103B7510[BYTE1(v22)] ^ BYTE1(v21);
    *(_BYTE *)(a3 + 15) = v21 ^ byte_103B7510[(unsigned __int8)v8];
  }
  return result;
}