PnpGetDeviceDependencyList

__int64 __fastcall PnpGetDeviceDependencyList(__int64 a1, int a2, __int64 a3, unsigned int a4, _DWORD *a5){
  _DEVICE_OBJECT *v5; 
  int v6; 
  int v7; 
  int v8; 
  UINT64 v9; 
  __int64 v10; 
  WCHAR *v11; 
  _LIST_ENTRY *DependentList; 
  __int16 v13; 
  _LIST_ENTRY *Flink; 
  _PNP_DEPENDENCY_EDGE *v15; 
  __int64 v16; 
  __int64 v17; 
  __int64 v18; 
  WCHAR *v19; 
  __int64 v20; 
  _QWORD *v21; 
  _QWORD *v22; 
  __int64 v23; 
  WCHAR *v24; 
  UINT64 dwFlags; 
  _NTSTRSAFE_PWSTR ppszDestEnd[2]; 
  size_t pcchLength[2]; 
  _LIST_ENTRY *v29; 
  STRSAFE_PCNZWCH psz; 
  __int64 v31; 
  _LIST_ENTRY *v32; 
  __int64 v33; 
  UINT64 pcchRemaining; 
  int v35; 
  __int64 v36; 
  unsigned int v37; 

  v37 = a4;
  v36 = a3;
  v35 = a2;
  v5 = *(_DEVICE_OBJECT **)(a1 + 32);
  v6 = a2;
  *(_QWORD *)pcchLength = 0i64;
  psz = 0i64;
  v7 = 0;
  v8 = 0;
  v9 = a4;
  v10 = a3;
  pcchRemaining = a4;
  v11 = (WCHAR *)a3;
  *(_QWORD *)ppszDestEnd = a3;
  PnpAcquireDependencyRelationsLock(0);
  if( v6 )
  {
    if( v6 != 1 )
    {
      v8 = -1073741811;
      goto LABEL_39;
    }
    DependentList = PiGetDependentList(v5);
  }
  else
  {
    DependentList = PiGetProviderList(v5);
  }
  Flink = DependentList->Flink;
  v32 = DependentList;
  if( Flink == DependentList )
    goto LABEL_35;
  do
  {
    v15 = PiListEntryToDependencyEdge(Flink, (PNP_DEPENDENCY_EDGE_LIST_TYPE)v6);
    Flink = Flink->Flink;
    v29 = Flink;
    if( v6 )
      v16 = *((_QWORD *)v15 + 5);
    else
      v16 = *((_QWORD *)v15 + 4);
    v17 = *(_QWORD *)(v16 + 48);
    if( v17 )
      v18 = *(_QWORD *)(*(_QWORD *)(v17 + 312) + 40i64);
    else
      v18 = 0i64;
    if( v17 && v18 && (v19 = *(WCHAR **)(v18 + 48)) != 0i64 )
    {
      v8 = RtlStringCchLengthW(v19, 0xC8ui64, (UINT64 *)pcchLength);
      if( v8 < 0 )
        goto LABEL_39;
      v7 += pcchLength[0] + 1;
      if( ++*(_QWORD *)pcchLength <= v9 )
      {
        LODWORD(dwFlags) = 2048;
        v8 = RtlStringCchCopyExW(v11, v9, *(WCHAR **)(v20 + 48), (WCHAR **)ppszDestEnd, &pcchRemaining, dwFlags);
        if( v8 < 0 )
          goto LABEL_39;
        v11 = (WCHAR *)(*(_QWORD *)ppszDestEnd + 2i64);
        v9 = pcchRemaining - 1;
        *(_QWORD *)ppszDestEnd += 2i64;
        --pcchRemaining;
      }
    }
    else
    {
      v21 = (_QWORD *)(v16 + 56);
      v22 = *(_QWORD **)(v16 + 56);
      if( v22 != (_QWORD *)(v16 + 56) )
      {
        while( 1 )
        {
          v23 = (__int64)v22;
          v22 = (_QWORD *)*v22;
          v31 = v23;
          v33 = v23 + 16;
          v8 = PnpUnicodeStringToWstr((__int16 **)&psz, 0i64, (unsigned __int16 *)(v23 + 16));
          if( v8 < 0 )
            goto LABEL_39;
          v24 = (WCHAR *)psz;
          v8 = RtlStringCchLengthW((WCHAR *)psz, 0x7FFFui64, (UINT64 *)pcchLength);
          if( v8 < 0 )
            break;
          v7 += pcchLength[0] + 1;
          if( ++*(_QWORD *)pcchLength <= v9 )
          {
            LODWORD(dwFlags) = 2048;
            v8 = RtlStringCchCopyExW(v11, v9, v24, (WCHAR **)ppszDestEnd, &pcchRemaining, dwFlags);
            if( v8 < 0 )
            {
              PnpUnicodeStringToWstrFree(v24, v31 + 16);
              v9 = pcchRemaining;
              v11 = *(WCHAR **)ppszDestEnd;
LABEL_29:
              Flink = v29;
              goto LABEL_30;
            }
            v11 = (WCHAR *)(*(_QWORD *)ppszDestEnd + 2i64);
            v9 = pcchRemaining - 1;
            *(_QWORD *)ppszDestEnd += 2i64;
            --pcchRemaining;
          }
          PnpUnicodeStringToWstrFree(v24, v33);
          if( v22 == v21 )
            goto LABEL_29;
        }
        PnpUnicodeStringToWstrFree(v24, v31 + 16);
        goto LABEL_29;
      }
LABEL_30:
      if( v8 < 0 )
        goto LABEL_39;
      v6 = v35;
    }
  }
  while( Flink != v32 );
  if( v8 >= 0 )
  {
    v10 = v36;
    v13 = 0;
LABEL_35:
    if( ++v7 <= v37 )
      *(_WORD *)(v10 + 2i64 * (unsigned int)(v7 - 1)) = v13;
    else
      v8 = -1073741789;
  }
LABEL_39:
  ExReleaseResourceLite((PERESOURCE)((char *)&stru_140C452E0 + 384));
  PpDevNodeUnlockTree(PPL_SIMPLE_READ);
  if( (int)(v8 + 0x80000000) < 0 || v8 == -1073741789 )
  {
    if( a5 )
      *a5 = v7;
  }
  return(unsigned int)v8;
}

Referenced by: