libwebm: Googletest integration.

Add basic mux/parse tests and test data.

Change-Id: I3bef014f32ad4898d23bca792fb3fe275fe4e7c9

testing/test_util.cc

@@ -0,0 +1,54 @@
+// Copyright (c) 2016 The WebM project authors. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS.  All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+#include "testing/test_util.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <memory>
+#include <string>
+
+#include "common/libwebm_utils.h"
+
+namespace libwebm {
+namespace test {
+
+std::string GetTestDataDir() { return std::getenv("LIBWEBM_TEST_DATA_PATH"); }
+
+std::string GetTestFilePath(const std::string& name) {
+  const std::string libwebm_testdata_dir = GetTestDataDir();
+  return libwebm_testdata_dir + "/" + name;
+}
+
+bool CompareFiles(const std::string& file1, const std::string& file2) {
+  const std::size_t kBlockSize = 4096;
+  std::uint8_t buf1[kBlockSize] = {0};
+  std::uint8_t buf2[kBlockSize] = {0};
+
+  FilePtr f1 = FilePtr(std::fopen(file1.c_str(), "rb"), FILEDeleter());
+  FilePtr f2 = FilePtr(std::fopen(file2.c_str(), "rb"), FILEDeleter());
+
+  if (!f1.get() || !f2.get()) {
+    // Files cannot match if one or both couldn't be opened.
+    return false;
+  }
+
+  do {
+    const std::size_t r1 = std::fread(buf1, 1, kBlockSize, f1.get());
+    const std::size_t r2 = std::fread(buf2, 1, kBlockSize, f2.get());
+
+    if (r1 != r2 || memcmp(buf1, buf2, r1)) {
+      return 0;  // Files are not equal
+    }
+  } while (!std::feof(f1.get()) && !std::feof(f2.get()));
+
+  return std::feof(f1.get()) && std::feof(f2.get());
+}
+
+}  // namespace test
+}  // namespace libwebm