Handle the situation where the recorded component type does not match

the required type for the actual number of stored points

This situation arises when decoding certain malformed files, most
notably it's seen in glb tiles from Google Earth's 3d tileset.

It's a port of the workaround used by Cesium native here:

https://github.com/CesiumGS/cesium-native/blob/d9172461e2d53f19d050ebc39f24a4f4ef5b9224/CesiumGltfReader/src/decodeDraco.cpp#L101

tiny_gltf.h

@@ -4890,6 +4890,25 @@ static bool ParseDracoExtension(Primitive *primitive, Model *model,
 
   // create new bufferView for indices
   if (primitive->indices >= 0) {
+    const draco::PointIndex::ValueType numPoint = mesh->num_points();
+    // handle the situation where the stored component type does not match the
+    // required type for the actual number of stored points
+    int supposedComponentType = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;
+    if (numPoint < static_cast<draco::PointIndex::ValueType>(
+                       std::numeric_limits<uint8_t>::max())) {
+      supposedComponentType = TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE;
+    } else if (
+        numPoint < static_cast<draco::PointIndex::ValueType>(
+                       std::numeric_limits<uint16_t>::max())) {
+      supposedComponentType = TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT;
+    } else {
+      supposedComponentType = TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT;
+    }
+
+    if (supposedComponentType > model->accessors[primitive->indices].componentType) {
+      model->accessors[primitive->indices].componentType = supposedComponentType;
+    }
+
     int32_t componentSize = GetComponentSizeInBytes(
         model->accessors[primitive->indices].componentType);
     Buffer decodedIndexBuffer;