int __thiscall sub_39504F96(_DWORD *this, unsigned __int8 *a2, unsigned int a3)
{
  void *v3; // esp
  int result; // eax
  int v5; // ecx
  int v6; // ecx
  int v7; // ecx
  int v8; // esi
  int v9; // ecx
  int v10; // ecx
  int v11; // ecx
  int v12; // ecx
  int v13; // ecx
  _DWORD *v14; // [esp+4h] [ebp-70050h]
  char v15; // [esp+10h] [ebp-70044h]
  int v16; // [esp+10014h] [ebp-60040h]
  char v17; // [esp+10018h] [ebp-6003Ch]
  unsigned __int16 v18; // [esp+1001Ah] [ebp-6003Ah]
  int v19; // [esp+20018h] [ebp-5003Ch]
  int v20; // [esp+2001Ch] [ebp-50038h]
  char v21; // [esp+20020h] [ebp-50034h]
  int v22; // [esp+60020h] [ebp-10034h]
  int v23; // [esp+60024h] [ebp-10030h]
  char v24; // [esp+60028h] [ebp-1002Ch]
  char v25; // [esp+6002Ah] [ebp-1002Ah]
  int v26; // [esp+70028h] [ebp-2Ch]
  int v27; // [esp+7002Ch] [ebp-28h]
  int *v28; // [esp+70030h] [ebp-24h]
  char v29; // [esp+70037h] [ebp-1Dh]
  int v30; // [esp+70038h] [ebp-1Ch]
  char v31; // [esp+7003Ch] [ebp-18h]
  char v32; // [esp+70047h] [ebp-Dh]
  int v33; // [esp+70050h] [ebp-4h]

  v3 = alloca(458824);
  v14 = this;
  result = (int)this;
  if ( this[5] )
  {
    v32 = byte_395CB000[*a2];
    v29 = 0;
    v5 = this[5];
    sub_395804CE(&v30);
    v33 = 0;
    v28 = &v30;
    switch ( v32 )
    {
      case 1:
        v27 = *(unsigned __int16 *)(a2 + 3);
        if ( *(_BYTE *)(*(_DWORD *)off_395C0544 + 172)
          || v27 == 524
          || v27 == 335
          || v27 == 174
          || !(unsigned __int8)sub_39580085(v14[5]) )
        {
          if ( v27 )
          {
            v6 = v14[5];
            sub_39518D8E(a2 + 3, a3 - 3);
          }
          else
          {
            sub_39581A6B(v28, a2 + 3, a3 - 3);
          }
          v29 = 1;
        }
        else
        {
          (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
            v14,
            1,
            "encryption-mv",
            0,
            0,
            0);
        }
        break;
      case 2:
        v7 = v14[5];
        sub_3951296D(a2 + 1, a3 - 1);
        v29 = 1;
        break;
      case 3:
        v26 = 65534;
        v8 = v14[4];
        if ( (unsigned __int8)sub_3957FB31((int)(a2 + 1), &v24, (int)&v26) )
        {
          v9 = v14[5];
          sub_39518D8E(&v25, v26 - 2);
          v29 = 1;
        }
        else
        {
          (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
            v14,
            13,
            "decompress-mv",
            0,
            0,
            0);
        }
        break;
      case 4:
        v22 = 0x40000;
        v23 = 0;
        if ( a3 >= 3 )
        {
          v23 = *(unsigned __int16 *)(a2 + 1);
          if ( (unsigned __int8)sub_3957FC42(a2 + 3, &v21) )
          {
            v10 = v14[5];
            sub_3950D638(v23, &v21, v22);
            v29 = 1;
          }
          else
          {
            (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
              v14,
              13,
              "decompress-mp-body",
              0,
              0,
              0);
          }
        }
        else
        {
          (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
            v14,
            13,
            "decompress-mp-size",
            0,
            0,
            0);
        }
        break;
      case 5:
        v20 = 65534;
        (*(void (__thiscall **)(int))(*(_DWORD *)(v14[5] + 4) + 24))(v14[5] + 4);
        if ( (unsigned __int8)sub_3957FCA7(a2 + 1, &v17) )
        {
          if ( (unsigned __int8)sub_3957FD15() )
          {
            v11 = v14[5];
            if ( (unsigned __int8)sub_3951A1C5(&v17) )
            {
              v19 = v18;
              if ( v18 )
              {
                v12 = v14[5];
                sub_39518D8E(&v18, a3 - 3);
              }
              else
              {
                sub_39581A6B(v28, &v18, a3 - 3);
              }
              v29 = 1;
            }
            else
            {
              (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
                v14,
                13,
                "sequence-mv",
                0,
                0,
                0);
            }
          }
          else
          {
            (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
              v14,
              13,
              "hash-mv",
              0,
              0,
              0);
          }
        }
        else
        {
          (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
            v14,
            13,
            "encryption-mv",
            0,
            0,
            0);
        }
        break;
      case 6:
        v16 = 65534;
        if ( (unsigned __int8)sub_3957FCA7(a2 + 1, &v15) )
        {
          v13 = v14[5];
          sub_3951296D(&v15, a3 - 1);
          v29 = 1;
        }
        else
        {
          (*(void (__thiscall **)(_DWORD *, signed int, const char *, _DWORD, _DWORD, _DWORD))(*v14 + 52))(
            v14,
            13,
            "encryptio-mv",
            0,
            0,
            0);
        }
        break;
    }
    if ( !v29 )
      nullsub_7();
    v33 = -1;
    result = (*(int (__cdecl **)(char *))((v30 & 0xFFFFFFFC) + 4))(&v31);
  }
  return result;
}