base/platform_file_unittest.cc - platform/external/chromium_org - Git at Google

 // Copyright (c) 2012 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.

 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/platform_file.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace base {

 namespace {

 // Reads from a file the given number of bytes, or until EOF is reached.
 // Returns the number of bytes read.
 int ReadFully(PlatformFile file, int64 offset, char* data, int size) {
   return ReadPlatformFile(file, offset, data, size);
 }

 // Writes the given number of bytes to a file.
 // Returns the number of bytes written.
 int WriteFully(PlatformFile file, int64 offset,
                const char* data, int size) {
   return WritePlatformFile(file, offset, data, size);
 }

 } // namespace

 TEST(PlatformFile, CreatePlatformFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("create_file_1");

   // Open a file that doesn't exist.
   PlatformFileError error_code = PLATFORM_FILE_OK;
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN | PLATFORM_FILE_READ,
       NULL,
       &error_code);
   EXPECT_EQ(kInvalidPlatformFileValue, file);
   EXPECT_EQ(PLATFORM_FILE_ERROR_NOT_FOUND, error_code);

   // Open or create a file.
   bool created = false;
   error_code = PLATFORM_FILE_OK;
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN_ALWAYS | PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_TRUE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);
   ClosePlatformFile(file);

   // Open an existing file.
   created = false;
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN | PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_FALSE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);
   ClosePlatformFile(file);

   // Create a file that exists.
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE | PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_EQ(kInvalidPlatformFileValue, file);
   EXPECT_FALSE(created);
   EXPECT_EQ(PLATFORM_FILE_ERROR_EXISTS, error_code);

   // Create or overwrite a file.
   error_code = PLATFORM_FILE_OK;
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE_ALWAYS | PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_TRUE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);
   ClosePlatformFile(file);

   // Create a delete-on-close file.
   created = false;
   file_path = temp_dir.path().AppendASCII("create_file_2");
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN_ALWAYS | PLATFORM_FILE_DELETE_ON_CLOSE |
           PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_TRUE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);

   EXPECT_TRUE(ClosePlatformFile(file));
   EXPECT_FALSE(PathExists(file_path));
 }

 TEST(PlatformFile, DeleteOpenFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("create_file_1");

   // Create a file.
   bool created = false;
   PlatformFileError error_code = PLATFORM_FILE_OK;
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN_ALWAYS | PLATFORM_FILE_READ |
           PLATFORM_FILE_SHARE_DELETE,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_TRUE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);

   // Open an existing file and mark it as delete on close.
   created = false;
   PlatformFile same_file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN | PLATFORM_FILE_DELETE_ON_CLOSE |
           PLATFORM_FILE_READ,
       &created,
       &error_code);
   EXPECT_NE(kInvalidPlatformFileValue, file);
   EXPECT_FALSE(created);
   EXPECT_EQ(PLATFORM_FILE_OK, error_code);

   // Close both handles and check that the file is gone.
   ClosePlatformFile(file);
   ClosePlatformFile(same_file);
   EXPECT_FALSE(PathExists(file_path));
 }

 TEST(PlatformFile, ReadWritePlatformFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("read_write_file");
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE | PLATFORM_FILE_READ |
           PLATFORM_FILE_WRITE,
       NULL,
       NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   char data_to_write[] = "test";
   const int kTestDataSize = 4;

   // Write 0 bytes to the file.
   int bytes_written = WriteFully(file, 0, data_to_write, 0);
   EXPECT_EQ(0, bytes_written);

   // Write "test" to the file.
   bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
   EXPECT_EQ(kTestDataSize, bytes_written);

   // Read from EOF.
   char data_read_1[32];
   int bytes_read = ReadFully(file, kTestDataSize, data_read_1, kTestDataSize);
   EXPECT_EQ(0, bytes_read);

   // Read from somewhere in the middle of the file.
   const int kPartialReadOffset = 1;
   bytes_read = ReadFully(file, kPartialReadOffset, data_read_1, kTestDataSize);
   EXPECT_EQ(kTestDataSize - kPartialReadOffset, bytes_read);
   for (int i = 0; i < bytes_read; i++)
     EXPECT_EQ(data_to_write[i + kPartialReadOffset], data_read_1[i]);

   // Read 0 bytes.
   bytes_read = ReadFully(file, 0, data_read_1, 0);
   EXPECT_EQ(0, bytes_read);

   // Read the entire file.
   bytes_read = ReadFully(file, 0, data_read_1, kTestDataSize);
   EXPECT_EQ(kTestDataSize, bytes_read);
   for (int i = 0; i < bytes_read; i++)
     EXPECT_EQ(data_to_write[i], data_read_1[i]);

   // Read again, but using the trivial native wrapper.
   bytes_read = ReadPlatformFileNoBestEffort(file, 0, data_read_1,
                                                   kTestDataSize);
   EXPECT_LE(bytes_read, kTestDataSize);
   for (int i = 0; i < bytes_read; i++)
     EXPECT_EQ(data_to_write[i], data_read_1[i]);

   // Write past the end of the file.
   const int kOffsetBeyondEndOfFile = 10;
   const int kPartialWriteLength = 2;
   bytes_written = WriteFully(file, kOffsetBeyondEndOfFile,
                              data_to_write, kPartialWriteLength);
   EXPECT_EQ(kPartialWriteLength, bytes_written);

   // Make sure the file was extended.
   int64 file_size = 0;
   EXPECT_TRUE(GetFileSize(file_path, &file_size));
   EXPECT_EQ(kOffsetBeyondEndOfFile + kPartialWriteLength, file_size);

   // Make sure the file was zero-padded.
   char data_read_2[32];
   bytes_read = ReadFully(file, 0, data_read_2, static_cast<int>(file_size));
   EXPECT_EQ(file_size, bytes_read);
   for (int i = 0; i < kTestDataSize; i++)
     EXPECT_EQ(data_to_write[i], data_read_2[i]);
   for (int i = kTestDataSize; i < kOffsetBeyondEndOfFile; i++)
     EXPECT_EQ(0, data_read_2[i]);
   for (int i = kOffsetBeyondEndOfFile; i < file_size; i++)
     EXPECT_EQ(data_to_write[i - kOffsetBeyondEndOfFile], data_read_2[i]);

   // Close the file handle to allow the temp directory to be deleted.
   ClosePlatformFile(file);
 }

 TEST(PlatformFile, AppendPlatformFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("append_file");
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE | PLATFORM_FILE_APPEND,
       NULL,
       NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   char data_to_write[] = "test";
   const int kTestDataSize = 4;

   // Write 0 bytes to the file.
   int bytes_written = WriteFully(file, 0, data_to_write, 0);
   EXPECT_EQ(0, bytes_written);

   // Write "test" to the file.
   bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
   EXPECT_EQ(kTestDataSize, bytes_written);

   ClosePlatformFile(file);
   file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_OPEN | PLATFORM_FILE_READ |
           PLATFORM_FILE_APPEND,
       NULL,
       NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   char append_data_to_write[] = "78";
   const int kAppendDataSize = 2;

   // Append "78" to the file.
   bytes_written = WriteFully(file, 0, append_data_to_write, kAppendDataSize);
   EXPECT_EQ(kAppendDataSize, bytes_written);

   // Read the entire file.
   char data_read_1[32];
   int bytes_read = ReadFully(file, 0, data_read_1,
                              kTestDataSize + kAppendDataSize);
   EXPECT_EQ(kTestDataSize + kAppendDataSize, bytes_read);
   for (int i = 0; i < kTestDataSize; i++)
     EXPECT_EQ(data_to_write[i], data_read_1[i]);
   for (int i = 0; i < kAppendDataSize; i++)
     EXPECT_EQ(append_data_to_write[i], data_read_1[kTestDataSize + i]);

   // Close the file handle to allow the temp directory to be deleted.
   ClosePlatformFile(file);
 }


 TEST(PlatformFile, TruncatePlatformFile) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path = temp_dir.path().AppendASCII("truncate_file");
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE | PLATFORM_FILE_READ |
           PLATFORM_FILE_WRITE,
       NULL,
       NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   // Write "test" to the file.
   char data_to_write[] = "test";
   int kTestDataSize = 4;
   int bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
   EXPECT_EQ(kTestDataSize, bytes_written);

   // Extend the file.
   const int kExtendedFileLength = 10;
   int64 file_size = 0;
   EXPECT_TRUE(TruncatePlatformFile(file, kExtendedFileLength));
   EXPECT_TRUE(GetFileSize(file_path, &file_size));
   EXPECT_EQ(kExtendedFileLength, file_size);

   // Make sure the file was zero-padded.
   char data_read[32];
   int bytes_read = ReadFully(file, 0, data_read, static_cast<int>(file_size));
   EXPECT_EQ(file_size, bytes_read);
   for (int i = 0; i < kTestDataSize; i++)
     EXPECT_EQ(data_to_write[i], data_read[i]);
   for (int i = kTestDataSize; i < file_size; i++)
     EXPECT_EQ(0, data_read[i]);

   // Truncate the file.
   const int kTruncatedFileLength = 2;
   EXPECT_TRUE(TruncatePlatformFile(file, kTruncatedFileLength));
   EXPECT_TRUE(GetFileSize(file_path, &file_size));
   EXPECT_EQ(kTruncatedFileLength, file_size);

   // Make sure the file was truncated.
   bytes_read = ReadFully(file, 0, data_read, kTestDataSize);
   EXPECT_EQ(file_size, bytes_read);
   for (int i = 0; i < file_size; i++)
     EXPECT_EQ(data_to_write[i], data_read[i]);

   // Close the file handle to allow the temp directory to be deleted.
   ClosePlatformFile(file);
 }

 // Flakily fails: http://crbug.com/86494
 #if defined(OS_ANDROID)
 TEST(PlatformFile, TouchGetInfoPlatformFile) {
 #else
 TEST(PlatformFile, DISABLED_TouchGetInfoPlatformFile) {
 #endif
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   PlatformFile file = CreatePlatformFile(
       temp_dir.path().AppendASCII("touch_get_info_file"),
       PLATFORM_FILE_CREATE | PLATFORM_FILE_WRITE |
           PLATFORM_FILE_WRITE_ATTRIBUTES,
       NULL,
       NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   // Get info for a newly created file.
   PlatformFileInfo info;
   EXPECT_TRUE(GetPlatformFileInfo(file, &info));

   // Add 2 seconds to account for possible rounding errors on
   // filesystems that use a 1s or 2s timestamp granularity.
   Time now = Time::Now() + TimeDelta::FromSeconds(2);
   EXPECT_EQ(0, info.size);
   EXPECT_FALSE(info.is_directory);
   EXPECT_FALSE(info.is_symbolic_link);
   EXPECT_LE(info.last_accessed.ToInternalValue(), now.ToInternalValue());
   EXPECT_LE(info.last_modified.ToInternalValue(), now.ToInternalValue());
   EXPECT_LE(info.creation_time.ToInternalValue(), now.ToInternalValue());
   Time creation_time = info.creation_time;

   // Write "test" to the file.
   char data[] = "test";
   const int kTestDataSize = 4;
   int bytes_written = WriteFully(file, 0, data, kTestDataSize);
   EXPECT_EQ(kTestDataSize, bytes_written);

   // Change the last_accessed and last_modified dates.
   // It's best to add values that are multiples of 2 (in seconds)
   // to the current last_accessed and last_modified times, because
   // FATxx uses a 2s timestamp granularity.
   Time new_last_accessed =
       info.last_accessed + TimeDelta::FromSeconds(234);
   Time new_last_modified =
       info.last_modified + TimeDelta::FromMinutes(567);

   EXPECT_TRUE(TouchPlatformFile(file, new_last_accessed, new_last_modified));

   // Make sure the file info was updated accordingly.
   EXPECT_TRUE(GetPlatformFileInfo(file, &info));
   EXPECT_EQ(info.size, kTestDataSize);
   EXPECT_FALSE(info.is_directory);
   EXPECT_FALSE(info.is_symbolic_link);

   // ext2/ext3 and HPS/HPS+ seem to have a timestamp granularity of 1s.
 #if defined(OS_POSIX)
   EXPECT_EQ(info.last_accessed.ToTimeVal().tv_sec,
             new_last_accessed.ToTimeVal().tv_sec);
   EXPECT_EQ(info.last_modified.ToTimeVal().tv_sec,
             new_last_modified.ToTimeVal().tv_sec);
 #else
   EXPECT_EQ(info.last_accessed.ToInternalValue(),
             new_last_accessed.ToInternalValue());
   EXPECT_EQ(info.last_modified.ToInternalValue(),
             new_last_modified.ToInternalValue());
 #endif

   EXPECT_EQ(info.creation_time.ToInternalValue(),
             creation_time.ToInternalValue());

   // Close the file handle to allow the temp directory to be deleted.
   ClosePlatformFile(file);
 }

 TEST(PlatformFile, ReadFileAtCurrentPosition) {
   ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath file_path =
       temp_dir.path().AppendASCII("read_file_at_current_position");
   PlatformFile file = CreatePlatformFile(
       file_path,
       PLATFORM_FILE_CREATE | PLATFORM_FILE_READ |
           PLATFORM_FILE_WRITE,
       NULL, NULL);
   EXPECT_NE(kInvalidPlatformFileValue, file);

   const char kData[] = "test";
   const int kDataSize = arraysize(kData) - 1;
   EXPECT_EQ(kDataSize, WriteFully(file, 0, kData, kDataSize));

   EXPECT_EQ(0, SeekPlatformFile(file, PLATFORM_FILE_FROM_BEGIN, 0));

   char buffer[kDataSize];
   int first_chunk_size = kDataSize / 2;
   EXPECT_EQ(first_chunk_size,
             ReadPlatformFileAtCurrentPos(
                 file, buffer, first_chunk_size));
   EXPECT_EQ(kDataSize - first_chunk_size,
             ReadPlatformFileAtCurrentPos(
                 file, buffer + first_chunk_size,
                 kDataSize - first_chunk_size));
   EXPECT_EQ(std::string(buffer, buffer + kDataSize),
             std::string(kData));

   ClosePlatformFile(file);
 }

 }  // namespace base
	// Copyright (c) 2012 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.

	#include "base/file_util.h"
	#include "base/files/scoped_temp_dir.h"
	#include "base/platform_file.h"
	#include "base/time/time.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace base {

	namespace {

	// Reads from a file the given number of bytes, or until EOF is reached.
	// Returns the number of bytes read.
	int ReadFully(PlatformFile file, int64 offset, char* data, int size) {
	return ReadPlatformFile(file, offset, data, size);
	}

	// Writes the given number of bytes to a file.
	// Returns the number of bytes written.
	int WriteFully(PlatformFile file, int64 offset,
	const char* data, int size) {
	return WritePlatformFile(file, offset, data, size);
	}

	} // namespace

	TEST(PlatformFile, CreatePlatformFile) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path = temp_dir.path().AppendASCII("create_file_1");

	// Open a file that doesn't exist.
	PlatformFileError error_code = PLATFORM_FILE_OK;
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN \| PLATFORM_FILE_READ,
	NULL,
	&error_code);
	EXPECT_EQ(kInvalidPlatformFileValue, file);
	EXPECT_EQ(PLATFORM_FILE_ERROR_NOT_FOUND, error_code);

	// Open or create a file.
	bool created = false;
	error_code = PLATFORM_FILE_OK;
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN_ALWAYS \| PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_TRUE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);
	ClosePlatformFile(file);

	// Open an existing file.
	created = false;
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN \| PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_FALSE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);
	ClosePlatformFile(file);

	// Create a file that exists.
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_EQ(kInvalidPlatformFileValue, file);
	EXPECT_FALSE(created);
	EXPECT_EQ(PLATFORM_FILE_ERROR_EXISTS, error_code);

	// Create or overwrite a file.
	error_code = PLATFORM_FILE_OK;
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE_ALWAYS \| PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_TRUE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);
	ClosePlatformFile(file);

	// Create a delete-on-close file.
	created = false;
	file_path = temp_dir.path().AppendASCII("create_file_2");
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN_ALWAYS \| PLATFORM_FILE_DELETE_ON_CLOSE \|
	PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_TRUE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);

	EXPECT_TRUE(ClosePlatformFile(file));
	EXPECT_FALSE(PathExists(file_path));
	}

	TEST(PlatformFile, DeleteOpenFile) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path = temp_dir.path().AppendASCII("create_file_1");

	// Create a file.
	bool created = false;
	PlatformFileError error_code = PLATFORM_FILE_OK;
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN_ALWAYS \| PLATFORM_FILE_READ \|
	PLATFORM_FILE_SHARE_DELETE,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_TRUE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);

	// Open an existing file and mark it as delete on close.
	created = false;
	PlatformFile same_file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN \| PLATFORM_FILE_DELETE_ON_CLOSE \|
	PLATFORM_FILE_READ,
	&created,
	&error_code);
	EXPECT_NE(kInvalidPlatformFileValue, file);
	EXPECT_FALSE(created);
	EXPECT_EQ(PLATFORM_FILE_OK, error_code);

	// Close both handles and check that the file is gone.
	ClosePlatformFile(file);
	ClosePlatformFile(same_file);
	EXPECT_FALSE(PathExists(file_path));
	}

	TEST(PlatformFile, ReadWritePlatformFile) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path = temp_dir.path().AppendASCII("read_write_file");
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_READ \|
	PLATFORM_FILE_WRITE,
	NULL,
	NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	char data_to_write[] = "test";
	const int kTestDataSize = 4;

	// Write 0 bytes to the file.
	int bytes_written = WriteFully(file, 0, data_to_write, 0);
	EXPECT_EQ(0, bytes_written);

	// Write "test" to the file.
	bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
	EXPECT_EQ(kTestDataSize, bytes_written);

	// Read from EOF.
	char data_read_1[32];
	int bytes_read = ReadFully(file, kTestDataSize, data_read_1, kTestDataSize);
	EXPECT_EQ(0, bytes_read);

	// Read from somewhere in the middle of the file.
	const int kPartialReadOffset = 1;
	bytes_read = ReadFully(file, kPartialReadOffset, data_read_1, kTestDataSize);
	EXPECT_EQ(kTestDataSize - kPartialReadOffset, bytes_read);
	for (int i = 0; i < bytes_read; i++)
	EXPECT_EQ(data_to_write[i + kPartialReadOffset], data_read_1[i]);

	// Read 0 bytes.
	bytes_read = ReadFully(file, 0, data_read_1, 0);
	EXPECT_EQ(0, bytes_read);

	// Read the entire file.
	bytes_read = ReadFully(file, 0, data_read_1, kTestDataSize);
	EXPECT_EQ(kTestDataSize, bytes_read);
	for (int i = 0; i < bytes_read; i++)
	EXPECT_EQ(data_to_write[i], data_read_1[i]);

	// Read again, but using the trivial native wrapper.
	bytes_read = ReadPlatformFileNoBestEffort(file, 0, data_read_1,
	kTestDataSize);
	EXPECT_LE(bytes_read, kTestDataSize);
	for (int i = 0; i < bytes_read; i++)
	EXPECT_EQ(data_to_write[i], data_read_1[i]);

	// Write past the end of the file.
	const int kOffsetBeyondEndOfFile = 10;
	const int kPartialWriteLength = 2;
	bytes_written = WriteFully(file, kOffsetBeyondEndOfFile,
	data_to_write, kPartialWriteLength);
	EXPECT_EQ(kPartialWriteLength, bytes_written);

	// Make sure the file was extended.
	int64 file_size = 0;
	EXPECT_TRUE(GetFileSize(file_path, &file_size));
	EXPECT_EQ(kOffsetBeyondEndOfFile + kPartialWriteLength, file_size);

	// Make sure the file was zero-padded.
	char data_read_2[32];
	bytes_read = ReadFully(file, 0, data_read_2, static_cast<int>(file_size));
	EXPECT_EQ(file_size, bytes_read);
	for (int i = 0; i < kTestDataSize; i++)
	EXPECT_EQ(data_to_write[i], data_read_2[i]);
	for (int i = kTestDataSize; i < kOffsetBeyondEndOfFile; i++)
	EXPECT_EQ(0, data_read_2[i]);
	for (int i = kOffsetBeyondEndOfFile; i < file_size; i++)
	EXPECT_EQ(data_to_write[i - kOffsetBeyondEndOfFile], data_read_2[i]);

	// Close the file handle to allow the temp directory to be deleted.
	ClosePlatformFile(file);
	}

	TEST(PlatformFile, AppendPlatformFile) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path = temp_dir.path().AppendASCII("append_file");
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_APPEND,
	NULL,
	NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	char data_to_write[] = "test";
	const int kTestDataSize = 4;

	// Write 0 bytes to the file.
	int bytes_written = WriteFully(file, 0, data_to_write, 0);
	EXPECT_EQ(0, bytes_written);

	// Write "test" to the file.
	bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
	EXPECT_EQ(kTestDataSize, bytes_written);

	ClosePlatformFile(file);
	file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_OPEN \| PLATFORM_FILE_READ \|
	PLATFORM_FILE_APPEND,
	NULL,
	NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	char append_data_to_write[] = "78";
	const int kAppendDataSize = 2;

	// Append "78" to the file.
	bytes_written = WriteFully(file, 0, append_data_to_write, kAppendDataSize);
	EXPECT_EQ(kAppendDataSize, bytes_written);

	// Read the entire file.
	char data_read_1[32];
	int bytes_read = ReadFully(file, 0, data_read_1,
	kTestDataSize + kAppendDataSize);
	EXPECT_EQ(kTestDataSize + kAppendDataSize, bytes_read);
	for (int i = 0; i < kTestDataSize; i++)
	EXPECT_EQ(data_to_write[i], data_read_1[i]);
	for (int i = 0; i < kAppendDataSize; i++)
	EXPECT_EQ(append_data_to_write[i], data_read_1[kTestDataSize + i]);

	// Close the file handle to allow the temp directory to be deleted.
	ClosePlatformFile(file);
	}


	TEST(PlatformFile, TruncatePlatformFile) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path = temp_dir.path().AppendASCII("truncate_file");
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_READ \|
	PLATFORM_FILE_WRITE,
	NULL,
	NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	// Write "test" to the file.
	char data_to_write[] = "test";
	int kTestDataSize = 4;
	int bytes_written = WriteFully(file, 0, data_to_write, kTestDataSize);
	EXPECT_EQ(kTestDataSize, bytes_written);

	// Extend the file.
	const int kExtendedFileLength = 10;
	int64 file_size = 0;
	EXPECT_TRUE(TruncatePlatformFile(file, kExtendedFileLength));
	EXPECT_TRUE(GetFileSize(file_path, &file_size));
	EXPECT_EQ(kExtendedFileLength, file_size);

	// Make sure the file was zero-padded.
	char data_read[32];
	int bytes_read = ReadFully(file, 0, data_read, static_cast<int>(file_size));
	EXPECT_EQ(file_size, bytes_read);
	for (int i = 0; i < kTestDataSize; i++)
	EXPECT_EQ(data_to_write[i], data_read[i]);
	for (int i = kTestDataSize; i < file_size; i++)
	EXPECT_EQ(0, data_read[i]);

	// Truncate the file.
	const int kTruncatedFileLength = 2;
	EXPECT_TRUE(TruncatePlatformFile(file, kTruncatedFileLength));
	EXPECT_TRUE(GetFileSize(file_path, &file_size));
	EXPECT_EQ(kTruncatedFileLength, file_size);

	// Make sure the file was truncated.
	bytes_read = ReadFully(file, 0, data_read, kTestDataSize);
	EXPECT_EQ(file_size, bytes_read);
	for (int i = 0; i < file_size; i++)
	EXPECT_EQ(data_to_write[i], data_read[i]);

	// Close the file handle to allow the temp directory to be deleted.
	ClosePlatformFile(file);
	}

	// Flakily fails: http://crbug.com/86494
	#if defined(OS_ANDROID)
	TEST(PlatformFile, TouchGetInfoPlatformFile) {
	#else
	TEST(PlatformFile, DISABLED_TouchGetInfoPlatformFile) {
	#endif
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	PlatformFile file = CreatePlatformFile(
	temp_dir.path().AppendASCII("touch_get_info_file"),
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_WRITE \|
	PLATFORM_FILE_WRITE_ATTRIBUTES,
	NULL,
	NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	// Get info for a newly created file.
	PlatformFileInfo info;
	EXPECT_TRUE(GetPlatformFileInfo(file, &info));

	// Add 2 seconds to account for possible rounding errors on
	// filesystems that use a 1s or 2s timestamp granularity.
	Time now = Time::Now() + TimeDelta::FromSeconds(2);
	EXPECT_EQ(0, info.size);
	EXPECT_FALSE(info.is_directory);
	EXPECT_FALSE(info.is_symbolic_link);
	EXPECT_LE(info.last_accessed.ToInternalValue(), now.ToInternalValue());
	EXPECT_LE(info.last_modified.ToInternalValue(), now.ToInternalValue());
	EXPECT_LE(info.creation_time.ToInternalValue(), now.ToInternalValue());
	Time creation_time = info.creation_time;

	// Write "test" to the file.
	char data[] = "test";
	const int kTestDataSize = 4;
	int bytes_written = WriteFully(file, 0, data, kTestDataSize);
	EXPECT_EQ(kTestDataSize, bytes_written);

	// Change the last_accessed and last_modified dates.
	// It's best to add values that are multiples of 2 (in seconds)
	// to the current last_accessed and last_modified times, because
	// FATxx uses a 2s timestamp granularity.
	Time new_last_accessed =
	info.last_accessed + TimeDelta::FromSeconds(234);
	Time new_last_modified =
	info.last_modified + TimeDelta::FromMinutes(567);

	EXPECT_TRUE(TouchPlatformFile(file, new_last_accessed, new_last_modified));

	// Make sure the file info was updated accordingly.
	EXPECT_TRUE(GetPlatformFileInfo(file, &info));
	EXPECT_EQ(info.size, kTestDataSize);
	EXPECT_FALSE(info.is_directory);
	EXPECT_FALSE(info.is_symbolic_link);

	// ext2/ext3 and HPS/HPS+ seem to have a timestamp granularity of 1s.
	#if defined(OS_POSIX)
	EXPECT_EQ(info.last_accessed.ToTimeVal().tv_sec,
	new_last_accessed.ToTimeVal().tv_sec);
	EXPECT_EQ(info.last_modified.ToTimeVal().tv_sec,
	new_last_modified.ToTimeVal().tv_sec);
	#else
	EXPECT_EQ(info.last_accessed.ToInternalValue(),
	new_last_accessed.ToInternalValue());
	EXPECT_EQ(info.last_modified.ToInternalValue(),
	new_last_modified.ToInternalValue());
	#endif

	EXPECT_EQ(info.creation_time.ToInternalValue(),
	creation_time.ToInternalValue());

	// Close the file handle to allow the temp directory to be deleted.
	ClosePlatformFile(file);
	}

	TEST(PlatformFile, ReadFileAtCurrentPosition) {
	ScopedTempDir temp_dir;
	ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
	FilePath file_path =
	temp_dir.path().AppendASCII("read_file_at_current_position");
	PlatformFile file = CreatePlatformFile(
	file_path,
	PLATFORM_FILE_CREATE \| PLATFORM_FILE_READ \|
	PLATFORM_FILE_WRITE,
	NULL, NULL);
	EXPECT_NE(kInvalidPlatformFileValue, file);

	const char kData[] = "test";
	const int kDataSize = arraysize(kData) - 1;
	EXPECT_EQ(kDataSize, WriteFully(file, 0, kData, kDataSize));

	EXPECT_EQ(0, SeekPlatformFile(file, PLATFORM_FILE_FROM_BEGIN, 0));

	char buffer[kDataSize];
	int first_chunk_size = kDataSize / 2;
	EXPECT_EQ(first_chunk_size,
	ReadPlatformFileAtCurrentPos(
	file, buffer, first_chunk_size));
	EXPECT_EQ(kDataSize - first_chunk_size,
	ReadPlatformFileAtCurrentPos(
	file, buffer + first_chunk_size,
	kDataSize - first_chunk_size));
	EXPECT_EQ(std::string(buffer, buffer + kDataSize),
	std::string(kData));

	ClosePlatformFile(file);
	}

	} // namespace base