Update spec utility function for new method signature

Author: javagl

specs/gltfExtensions/validateGltf.ts

@@ -6,6 +6,7 @@ import { ResourceResolvers } from "3d-tiles-tools";
 import { ValidationContext } from "../../src/validation/ValidationContext";
 
 import { GltfExtensionValidators } from "../../src/validation/gltf/GltfExtensionValidators";
+import { GltfDataReader } from "../../src/validation/gltf/GltfDataReader";
 
 export async function validateGltf(gltfFileName: string) {
   fs.readFileSync(gltfFileName);
@@ -17,11 +18,18 @@ export async function validateGltf(gltfFileName: string) {
   const context = new ValidationContext(directory, resourceResolver);
   const gltfFileData = await resourceResolver.resolveData(fileName);
   if (gltfFileData) {
-    await GltfExtensionValidators.validateGltfExtensions(
+    const gltfData = await GltfDataReader.readGltfData(
       gltfFileName,
       gltfFileData,
       context
     );
+    if (gltfData) {
+      await GltfExtensionValidators.validateGltfExtensions(
+        gltfFileName,
+        gltfData,
+        context
+      );
+    }
   }
   const validationResult = context.getResult();
   return validationResult;