Handle wrongly formatted EXIF string field.

ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js

Index: ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js b/ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js
new file mode 100644
index 0000000000000000000000000000000000000000..eefe242bd222bc8c0ff77acad4f8809e6c745570
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/metadata/exif_parser_unittest.js
@@ -0,0 +1,67 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * Creates a directory with specified tag. This method only supports string
+ * format tag which is longer than 4 characters.
+ * @param {!TypedArray} bytes Bytes to be written.
+ * @param {!ExifEntry} tag An exif entry which will be written.
+ */
+function writeDirectory_(bytes, tag) {
+  assertEquals(2, tag.format);
+  assertTrue(tag.componentCount > 4);
+
+  var byteWriter = new ByteWriter(bytes.buffer, 0);
+  byteWriter.writeScalar(1, 2); // Number of fields.
+
+  byteWriter.writeScalar(tag.id, 2);
+  byteWriter.writeScalar(tag.format, 2);
+  byteWriter.writeScalar(tag.componentCount, 4);
+  byteWriter.forward(tag.id, 4);
+
+  byteWriter.writeScalar(0, 4); // Offset to next IFD.
+
+  byteWriter.resolveOffset(tag.id);
+  byteWriter.writeString(tag.value);
+
+  byteWriter.checkResolved();
+}
+
+/**
+ * Parses exif data and return parsed tags.
+ * @param {!TypedArray} bytes Bytes to be read.
+ * @return {!Object<!Exif.Tag, !ExifEntry>} Tags.
+ */
+function parseExifData_(bytes) {
+  var exifParser = new ExifParser(this);
+  exifParser.log = function(arg) { console.log(arg); };
+  exifParser.vlog = function(arg) { console.log(arg); };
+
+  var tags = {};
+  var byteReader = new ByteReader(bytes.buffer);
+  assertEquals(0, exifParser.readDirectory(byteReader, tags));
+  return tags;
+}
+
+/**
+ * Test case a string doest not end with null character termination.
+ */
+function testWithoutNullCharacterTermination() {
+  // Create a data which doesn't end with null character.
+  var bytes = new Uint8Array(0x10000);
+  writeDirectory_(bytes, {
+    id: 0x10f, // Manufacture.
+    format: 2, // String.
+    componentCount: 11,
+    value: 'Manufacture'
+  });
+
+  // Parse the data.
+  var tags = parseExifData_(bytes);
+
+  // Null character should be added at the end of value.
+  var manufactureTag = tags[0x10f];
+  assertEquals(12, manufactureTag.componentCount);
+  assertEquals('Manufacture\0', manufactureTag.value);
+}