static void
AnnotateInterfaceRegistrationForHive(JSONWriter& aJson, HKEY aHive, REFIID aIid,
                                     const JSONWriter::CollectionStyle aStyle)
{
  nsAutoString interfaceSubKey;
  interfaceSubKey.AppendLiteral(kSoftwareClasses);
  interfaceSubKey.AppendLiteral(kInterface);
  nsAutoString iid;
  GUIDToString(aIid, iid);
  interfaceSubKey.Append(iid);

  nsAutoString interfaceName;
  if (GetStringValue(aHive, interfaceSubKey, kDefaultValue, interfaceName)) {
    aJson.StringProperty("InterfaceName",
                         NS_ConvertUTF16toUTF8(interfaceName).get());
  }

  nsAutoString psSubKey(interfaceSubKey);
  psSubKey.AppendLiteral(kProxyStubClsid32);

  nsAutoString psClsid;
  if (GetStringValue(aHive, psSubKey, kDefaultValue, psClsid)) {
    aJson.StartObjectProperty("ProxyStub", aStyle);
    aJson.StringProperty("CLSID", NS_ConvertUTF16toUTF8(psClsid).get());
    AnnotateClsidRegistrationForHive(aJson, aHive, psClsid, aStyle);
    aJson.EndObject();
  }

  nsAutoString typelibSubKey(interfaceSubKey);
  typelibSubKey.AppendLiteral(kTypeLib);

  nsAutoString typelibId;
  bool haveTypelibId = GetStringValue(aHive, typelibSubKey, kDefaultValue,
                                      typelibId);

  nsAutoString typelibVersion;
  bool haveTypelibVersion = GetStringValue(aHive, typelibSubKey, kVersion,
                                           typelibVersion);

  if (haveTypelibId || haveTypelibVersion) {
    aJson.StartObjectProperty("TypeLib", aStyle);
  }

  if (haveTypelibId) {
    aJson.StringProperty("ID", NS_ConvertUTF16toUTF8(typelibId).get());
  }

  if (haveTypelibVersion) {
    aJson.StringProperty("Version", NS_ConvertUTF16toUTF8(typelibVersion).get());
  }

  if (haveTypelibId && haveTypelibVersion) {
    AnnotateTypelibRegistrationForHive(aJson, aHive, typelibId, typelibVersion,
                                       aStyle);
  }

  if (haveTypelibId || haveTypelibVersion) {
    aJson.EndObject();
  }
}
static void
AnnotateTypelibRegistrationForHive(JSONWriter& aJson, HKEY aHive,
                                   const nsAString& aTypelibId,
                                   const nsAString& aTypelibVersion,
                                   const JSONWriter::CollectionStyle aStyle)
{
  nsAutoString typelibSubKey;
  typelibSubKey.AppendLiteral(kSoftwareClasses);
  typelibSubKey.AppendLiteral(kTypeLib);
  typelibSubKey.AppendLiteral(kBackslash);
  typelibSubKey.Append(aTypelibId);
  typelibSubKey.AppendLiteral(kBackslash);
  typelibSubKey.Append(aTypelibVersion);

  nsAutoString typelibDesc;
  if (GetStringValue(aHive, typelibSubKey, kDefaultValue, typelibDesc)) {
    aJson.StringProperty("Description",
                         NS_ConvertUTF16toUTF8(typelibDesc).get());
  }

  nsAutoString flagsSubKey(typelibSubKey);
  flagsSubKey.AppendLiteral(kBackslash);
  flagsSubKey.AppendLiteral(kFlags);

  nsAutoString typelibFlags;
  if (GetStringValue(aHive, flagsSubKey, kDefaultValue, typelibFlags)) {
    aJson.StringProperty("Flags", NS_ConvertUTF16toUTF8(typelibFlags).get());
  }

  HKEY rawTypelibKey;
  LONG result = RegOpenKeyEx(aHive, typelibSubKey.get(), 0, KEY_READ,
                             &rawTypelibKey);
  if (result != ERROR_SUCCESS) {
    return;
  }
  nsAutoRegKey typelibKey(rawTypelibKey);

  const size_t kMaxLcidCharLen = 9;
  WCHAR keyName[kMaxLcidCharLen];

  for (DWORD index = 0; result == ERROR_SUCCESS; ++index) {
    DWORD keyNameLength = ArrayLength(keyName);
    result = RegEnumKeyEx(typelibKey, index, keyName, &keyNameLength, nullptr,
                          nullptr, nullptr, nullptr);

    unsigned long lcid;
    if (result == ERROR_SUCCESS && ConvertLCID(keyName, WrapNotNull(&lcid))) {
      nsDependentString strLcid(keyName, keyNameLength);
      aJson.StartObjectProperty(NS_ConvertUTF16toUTF8(strLcid).get(), aStyle);
      AnnotateTypelibPlatform(aJson, typelibKey, strLcid, kWin32, aStyle);
#if defined(HAVE_64BIT_BUILD)
      AnnotateTypelibPlatform(aJson, typelibKey, strLcid, kWin64, aStyle);
#endif
      aJson.EndObject();
    }
  }
}
static void
AnnotateTypelibPlatform(JSONWriter& aJson, HKEY aBaseKey,
                        const nsAString& aLcidSubkey,
                        const char16_t (&aPlatform)[N],
                        const JSONWriter::CollectionStyle aStyle)
{
  nsLiteralString platform(aPlatform);

  nsAutoString fullSubkey(aLcidSubkey);
  fullSubkey.AppendLiteral(kBackslash);
  fullSubkey.Append(platform);

  nsAutoString tlbPath;
  if (GetStringValue(aBaseKey, fullSubkey, kDefaultValue, tlbPath)) {
    aJson.StartObjectProperty(NS_ConvertUTF16toUTF8(platform).get(), aStyle);
    aJson.StringProperty("Path", NS_ConvertUTF16toUTF8(tlbPath).get());
    CheckTlbPath(aJson, tlbPath);
    aJson.EndObject();
  }
}