xml proto converter: Fix ossfuzz issue 19507 (no return value). (#3167)

projects/xerces-c/xmlProtoConverter.cpp

@@ -56,6 +56,9 @@ void ProtoConverter::visit(Prolog const& _x)
 
 void ProtoConverter::visit(KeyValue const& _x)
 {
+	if (!KeyValue::XmlNamespace_IsValid(_x.type()))
+		return;
+
 	switch (_x.type())
 	{
 	case KeyValue::ATTRIBUTES:
@@ -127,6 +130,9 @@ void ProtoConverter::visit(Content const& _x)
 
 void ProtoConverter::visit(ElementDecl const& _x)
 {
+	if (!ElementDecl::ContentSpec_IsValid(_x.spec()))
+		return;
+
 	m_output << "<!ELEMENT " << _x.name() << " ";
 	switch (_x.spec())
 	{
@@ -167,6 +173,9 @@ void ProtoConverter::visit(ElementDecl const& _x)
 
 void ProtoConverter::visit(AttValue const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	m_output << "\"";
 	string prefix;
 	switch (_x.type())
@@ -196,6 +205,9 @@ void ProtoConverter::visit(AttValue const& _x)
 
 void ProtoConverter::visit(DefaultDecl const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	switch (_x.type())
 	{
 	case DefaultDecl::REQUIRED:
@@ -219,6 +231,9 @@ void ProtoConverter::visit(DefaultDecl const& _x)
 
 void ProtoConverter::visit(AttDef const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	m_output << " " << removeNonAscii(_x.name()) << " ";
 	switch (_x.type())
 	{
@@ -323,6 +338,9 @@ void ProtoConverter::visit(PEDef const& _x)
 
 void ProtoConverter::visit(EntityValue const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	m_output << "\"";
 	string prefix;
 	switch (_x.type())
@@ -353,6 +371,9 @@ void ProtoConverter::visit(EntityValue const& _x)
 
 void ProtoConverter::visit(EntityDecl const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	m_output << "<!ENTITY ";
 	switch (_x.type())
 	{
@@ -373,6 +394,9 @@ void ProtoConverter::visit(EntityDecl const& _x)
 
 void ProtoConverter::visit(ConditionalSect const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	switch (_x.type())
 	{
 	case ConditionalSect::INCLUDE:
@@ -486,6 +510,9 @@ string ProtoConverter::getPredefined(Element_Id _x, string const& _prop)
 /// Returns uri string for a given Element_Id type
 string ProtoConverter::getUri(Element_Id _x)
 {
+	if (!Element::Id_IsValid(_x))
+		return s_XInclude;
+
 	switch (_x)
 	{
 	case Element::XIINCLUDE:
@@ -504,6 +531,9 @@ string ProtoConverter::getUri(Element_Id _x)
 
 void ProtoConverter::visit(Element const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	// Predefined child node
 	string child = {};
 	// Predefined uri for child node
@@ -550,6 +580,9 @@ void ProtoConverter::visit(Element const& _x)
 
 void ProtoConverter::visit(ExternalId const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	switch (_x.type())
 	{
 	case ExternalId::SYSTEM:
@@ -581,6 +614,9 @@ void ProtoConverter::visit(DocTypeDecl const& _x)
 
 void ProtoConverter::visit(VersionNum const& _x)
 {
+	if (!isValid(_x))
+		return;
+
 	switch (_x.type())
 	{
 	case VersionNum::STANDARD:
@@ -596,6 +632,9 @@ void ProtoConverter::visit(VersionNum const& _x)
 
 void ProtoConverter::visit(Encodings const& _x)
 {
+	if (!Encodings::Enc_IsValid(_x.name()))
+		return;
+
 	m_output << " encoding=\"";
 	switch (_x.name())
 	{
@@ -699,6 +738,7 @@ void ProtoConverter::visit(XmlDeclaration const& _x)
 		break;
 	case XmlDeclaration_Standalone_XmlDeclaration_Standalone_INT_MIN_SENTINEL_DO_NOT_USE_:
 	case XmlDeclaration_Standalone_XmlDeclaration_Standalone_INT_MAX_SENTINEL_DO_NOT_USE_:
+	default:
 		break;
 	}
 	m_output << "?>\n";
@@ -715,4 +755,4 @@ string ProtoConverter::protoToString(XmlDocument const& _x)
 {
 	visit(_x);
 	return m_output.str();
-}
+}

projects/xerces-c/xmlProtoConverter.h

@@ -89,6 +89,11 @@ private:
 
 	void visit(XmlDocument const&);
 
+	template <typename T>
+	bool isValid(T const& messageType) {
+		return T::Type_IsValid(messageType.type());
+	}
+
 	std::string removeNonAscii(std::string const&);
 	std::string getUri(Element_Id _x);
 	std::string getPredefined(Element_Id _x, std::string const&);