Add WebP content sniffing code.

image/test/gtest/TestLoader.cpp

@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "Common.h"
+#include "imgLoader.h"
+#include "nsMimeTypes.h"
+#include "nsString.h"
+
+using namespace mozilla;
+using namespace mozilla::image;
+
+static void
+CheckMimeType(const char* aContents, size_t aLength, const char* aExpected)
+{
+  nsAutoCString detected;
+  nsresult rv = imgLoader::GetMimeTypeFromContent(aContents, aLength, detected);
+  if (aExpected) {
+    ASSERT_TRUE(NS_SUCCEEDED(rv));
+    EXPECT_TRUE(detected.EqualsASCII(aExpected));
+  } else {
+    ASSERT_TRUE(NS_FAILED(rv));
+    EXPECT_TRUE(detected.IsEmpty());
+  }
+}
+
+class ImageLoader : public ::testing::Test
+{
+protected:
+  AutoInitializeImageLib mInit;
+};
+
+TEST_F(ImageLoader, DetectGIF)
+{
+  const char buffer[] = "GIF87a";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_GIF);
+}
+
+TEST_F(ImageLoader, DetectPNG)
+{
+  const char buffer[] = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_PNG);
+}
+
+TEST_F(ImageLoader, DetectJPEG)
+{
+  const char buffer[] = "\xFF\xD8\xFF";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_JPEG);
+}
+
+TEST_F(ImageLoader, DetectART)
+{
+  const char buffer[] = "\x4A\x47\xFF\xFF\x00";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_ART);
+}
+
+TEST_F(ImageLoader, DetectBMP)
+{
+  const char buffer[] = "BM";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_BMP);
+}
+
+TEST_F(ImageLoader, DetectICO)
+{
+  const char buffer[] = "\x00\x00\x01\x00";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_ICO);
+}
+
+TEST_F(ImageLoader, DetectWebP)
+{
+  const char buffer[] = "RIFF\xFF\xFF\xFF\xFFWEBPVP8L";
+  CheckMimeType(buffer, sizeof(buffer), IMAGE_WEBP);
+}
+
+TEST_F(ImageLoader, DetectNone)
+{
+  const char buffer[] = "abcdefghijklmnop";
+  CheckMimeType(buffer, sizeof(buffer), nullptr);
+}
+