Add test file for glTF mesh loading

source/Irrlicht/tests/inMemoryFile.h

@@ -0,0 +1,32 @@
+#include <irrlicht.h>
+
+#include <cstddef>
+#include <sstream>
+#include <string>
+
+namespace irr
+{
+
+namespace io
+{
+
+class InMemoryFile: public IReadFile
+{
+public:
+	InMemoryFile(const io::path& filename, const std::string& s);
+
+	std::size_t read(void* buffer, std::size_t sizeToRead) override;
+	bool seek(long finalPos, bool relativeMovement=false) override;
+	long getSize() const override;
+	long getPos() const override;
+	const io::path& getFileName() const override;
+
+private:
+	io::path m_filename;
+	mutable std::stringstream m_sstream;
+};
+
+} // namespace io
+
+} // namespace irr
+