Update error handler

src/view.js

@@ -1210,7 +1210,7 @@ view.ModelFactoryService = class {
                         'object-detection.pbtxt',
                     ]);
                     let skip = knownUnsupportedIdentifiers.has(identifier);
-                    if (!skip && extension === 'pbtxt') {
+                    if (!skip && (extension === 'pbtxt' || extension === 'prototxt')) {
                         if (identifier.includes('label_map') || identifier.includes('labels_map') || identifier.includes('labelmap')) {
                             const tags = context.tags('pbtxt');
                             if (tags.size === 1 && (tags.has('item') || tags.has('entry'))) {
@@ -1218,7 +1218,9 @@ view.ModelFactoryService = class {
                             }
                         }
                     }
-                    throw new ModelError("Unsupported file content for extension '." + extension + "' in '" + identifier + "'.", !skip);
+                    const buffer = context.buffer;
+                    const content = Array.from(buffer.subarray(0, Math.min(8, buffer.length))).map((c) => (c < 16 ? '0' : '') + c.toString(16)).join('');
+                    throw new ModelError("Unsupported file content (" + content + ") for extension '." + extension + "' in '" + identifier + "'.", !skip);
                 }
             };
             return nextModule();

test/models.json

@@ -864,7 +864,7 @@
     "type":   "caffe2",
     "target": "ops/ops.pbtxt",
     "source": "https://raw.githubusercontent.com/tensorflow/tensorflow/master/tensorflow/core/ops/ops.pbtxt",
-    "error":  "Unsupported file content for extension '.pbtxt' in 'ops.pbtxt'.",
+    "error":  "Unsupported file content (6f70207b0a20206e) for extension '.pbtxt' in 'ops.pbtxt'.",
     "link":   "https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/ops/ops.pbtxt"
   },
   {
@@ -1076,7 +1076,7 @@
     "type":   "cntk",
     "target": "v2/mobilenetv2-1.0.dnn",
     "source": "https://s3.amazonaws.com/mxnet-model-server/onnx-mobilenet/mobilenetv2-1.0.model",
-    "error":  "Unsupported file content for extension '.dnn' in 'mobilenetv2-1.0.dnn'.",
+    "error":  "Unsupported file content (504b030414000000) for extension '.dnn' in 'mobilenetv2-1.0.dnn'.",
     "link":   "https://github.com/awslabs/mxnet-model-server/blob/master/docs/model_zoo.md"
   },
   {
@@ -2118,7 +2118,7 @@
     "type":   "keras",
     "target": "keras_invalid_file.h5",
     "source": "https://github.com/lutzroeder/netron/files/3364286/keras_invalid_file.zip[keras_invalid_file.h5]",
-    "error":  "Unsupported file content for extension '.h5' in 'keras_invalid_file.h5'.",
+    "error":  "Unsupported file content (0000000000000000) for extension '.h5' in 'keras_invalid_file.h5'.",
     "link":   "https://github.com/lutzroeder/netron/issues/57"
   },
   {
@@ -3095,7 +3095,7 @@
     "type":   "onnx",
     "target": "input_0.pb",
     "source": "https://s3.amazonaws.com/download.onnx/models/opset_9/shufflenet.tar.gz[shufflenet/test_data_set_0/input_0.pb]",
-    "error":  "Unsupported file content for extension '.pb' in 'input_0.pb'.",
+    "error":  "Unsupported file content (0801080308e00108) for extension '.pb' in 'input_0.pb'.",
     "link":   "https://github.com/onnx/models/tree/master/bvlc_alexnet"
   },
   {