Reland of Initial version of file wrapper

webrtc/base/file_unittest.cc

Index: webrtc/base/file_unittest.cc
diff --git a/webrtc/base/file_unittest.cc b/webrtc/base/file_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..458b6da75f2642dfead3d72786579903ca57e84a
--- /dev/null
+++ b/webrtc/base/file_unittest.cc
@@ -0,0 +1,166 @@
+/*
+ *  Copyright 2016 The WebRTC 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <limits>
+#include <memory>
+#include <string>
+
+#include "webrtc/base/gunit.h"
+#include "webrtc/base/file.h"
+#include "webrtc/test/testsupport/fileutils.h"
+
+#if defined(WEBRTC_WIN)
+
+#include "webrtc/base/win32.h"
+
+#else  // if defined(WEBRTC_WIN)
+
+#include <errno.h>
+
+#endif
+
+namespace rtc {
+
+void RemoveFile(const std::string& path) {
+#if defined(WEBRTC_WIN)
+  ::DeleteFile(ToUtf16(path).c_str());
+#else
+  ::unlink(path.c_str());
+#endif
+}
+
+int LastError() {
+#if defined(WEBRTC_WIN)
+  return ::GetLastError();
+#else
+  return errno;
+#endif
+}
+
+bool VerifyBuffer(uint8_t* buffer, size_t length, uint8_t start_value) {
+  for (size_t i = 0; i < length; ++i) {
+    uint8_t val = start_value++;
+    EXPECT_EQ(val, buffer[i]);
+    if (buffer[i] != val)
+      return false;
+  }
+  // Prevent the same buffer from being verified multiple times simply
+  // because some operation that should have written to it failed
+  memset(buffer, 0, length);
+  return true;
+}
+
+class FileTest : public ::testing::Test {
+ protected:
+  std::string path_;
+  void SetUp() {
+    path_ = webrtc::test::TempFilename(webrtc::test::OutputPath(), "test_file");
+    ASSERT_FALSE(path_.empty());
+  }
+  rtc::File OpenTempFile() { return rtc::File::Open(path_); }
+  void TearDown() { RemoveFile(path_); }
+};
+
+TEST_F(FileTest, DoubleClose) {
+  File file = OpenTempFile();
+  ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
+
+  EXPECT_TRUE(file.Close());
+  EXPECT_FALSE(file.Close());
+}
+
+TEST_F(FileTest, SimpleReadWrite) {
+  File file = OpenTempFile();
+  ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
+
+  uint8_t data[100] = {0};
+  uint8_t out[100] = {0};
+  for (int i = 0; i < 100; ++i) {
+    data[i] = i;
+  }
+
+  EXPECT_EQ(10u, file.Write(data, 10));
+
+  EXPECT_TRUE(file.Seek(0));
+  EXPECT_EQ(10u, file.Read(out, 10));
+  EXPECT_TRUE(VerifyBuffer(out, 10, 0));
+
+  EXPECT_TRUE(file.Seek(0));
+  EXPECT_EQ(100u, file.Write(data, 100));
+
+  EXPECT_TRUE(file.Seek(0));
+  EXPECT_EQ(100u, file.Read(out, 100));
+  EXPECT_TRUE(VerifyBuffer(out, 100, 0));
+
+  EXPECT_TRUE(file.Seek(1));
+  EXPECT_EQ(50u, file.Write(data, 50));
+  EXPECT_EQ(50u, file.Write(data + 50, 50));
+
+  EXPECT_TRUE(file.Seek(1));
+  EXPECT_EQ(100u, file.Read(out, 100));
+  EXPECT_TRUE(VerifyBuffer(out, 100, 0));
+}
+
+TEST_F(FileTest, ReadWriteClose) {
+  File file = OpenTempFile();
+  ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
+
+  uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  uint8_t out[10] = {0};
+  EXPECT_EQ(10u, file.Write(data, 10));
+  EXPECT_TRUE(file.Close());
+
+  File file2 = OpenTempFile();
+  ASSERT_TRUE(file2.IsOpen()) << "Error: " << LastError();
+  EXPECT_EQ(10u, file2.Read(out, 10));
+  EXPECT_TRUE(VerifyBuffer(out, 10, 0));
+}
+
+TEST_F(FileTest, RandomAccessRead) {
+  File file = OpenTempFile();
+  ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
+
+  uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  uint8_t out[10] = {0};
+  EXPECT_EQ(10u, file.Write(data, 10));
+
+  EXPECT_EQ(4u, file.ReadAt(out, 4, 0));
+  EXPECT_TRUE(VerifyBuffer(out, 4, 0));
+
+  EXPECT_EQ(4u, file.ReadAt(out, 4, 4));
+  EXPECT_TRUE(VerifyBuffer(out, 4, 4));
+
+  EXPECT_EQ(5u, file.ReadAt(out, 5, 5));
+  EXPECT_TRUE(VerifyBuffer(out, 5, 5));
+}
+
+TEST_F(FileTest, RandomAccessReadWrite) {
+  File file = OpenTempFile();
+  ASSERT_TRUE(file.IsOpen()) << "Error: " << LastError();
+
+  uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+  uint8_t out[10] = {0};
+  EXPECT_EQ(10u, file.Write(data, 10));
+  EXPECT_TRUE(file.Seek(4));
+
+  EXPECT_EQ(4u, file.WriteAt(data, 4, 4));
+  EXPECT_EQ(4u, file.ReadAt(out, 4, 4));
+  EXPECT_TRUE(VerifyBuffer(out, 4, 0));
+
+  EXPECT_EQ(2u, file.WriteAt(data, 2, 8));
+  EXPECT_EQ(2u, file.ReadAt(out, 2, 8));
+  EXPECT_TRUE(VerifyBuffer(out, 2, 0));
+}
+
+}  // namespace rtc