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// Copyright 2014 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/files/memory_mapped_file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"
namespace base {
namespace {
// Create a temporary buffer and fill it with a watermark sequence.
scoped_ptr<uint8[]> CreateTestBuffer(size_t size, size_t offset) {
scoped_ptr<uint8[]> buf(new uint8[size]);
for (size_t i = 0; i < size; ++i)
buf.get()[i] = static_cast<uint8>((offset + i) % 253);
return buf.Pass();
}
// Check that the watermark sequence is consistent with the |offset| provided.
bool CheckBufferContents(const uint8* data, size_t size, size_t offset) {
scoped_ptr<uint8[]> test_data(CreateTestBuffer(size, offset));
return memcmp(test_data.get(), data, size) == 0;
}
class MemoryMappedFileTest : public PlatformTest {
protected:
void SetUp() override {
PlatformTest::SetUp();
CreateTemporaryFile(&temp_file_path_);
}
void TearDown() override { EXPECT_TRUE(DeleteFile(temp_file_path_, false)); }
void CreateTemporaryTestFile(size_t size) {
File file(temp_file_path_,
File::FLAG_CREATE_ALWAYS | File::FLAG_READ | File::FLAG_WRITE);
EXPECT_TRUE(file.IsValid());
scoped_ptr<uint8[]> test_data(CreateTestBuffer(size, 0));
size_t bytes_written =
file.Write(0, reinterpret_cast<char*>(test_data.get()), size);
EXPECT_EQ(size, bytes_written);
file.Close();
}
const FilePath temp_file_path() const { return temp_file_path_; }
private:
FilePath temp_file_path_;
};
TEST_F(MemoryMappedFileTest, MapWholeFileByPath) {
const size_t kFileSize = 68 * 1024;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
map.Initialize(temp_file_path());
ASSERT_EQ(kFileSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kFileSize, 0));
}
TEST_F(MemoryMappedFileTest, MapWholeFileByFD) {
const size_t kFileSize = 68 * 1024;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
map.Initialize(File(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ));
ASSERT_EQ(kFileSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kFileSize, 0));
}
TEST_F(MemoryMappedFileTest, MapSmallFile) {
const size_t kFileSize = 127;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
map.Initialize(temp_file_path());
ASSERT_EQ(kFileSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kFileSize, 0));
}
TEST_F(MemoryMappedFileTest, MapWholeFileUsingRegion) {
const size_t kFileSize = 157 * 1024;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
File file(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ);
map.Initialize(file.Pass(), MemoryMappedFile::Region::kWholeFile);
ASSERT_EQ(kFileSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kFileSize, 0));
}
TEST_F(MemoryMappedFileTest, MapPartialRegionAtBeginning) {
const size_t kFileSize = 157 * 1024;
const size_t kPartialSize = 4 * 1024 + 32;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
File file(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ);
map.Initialize(file.Pass(), MemoryMappedFile::Region(0, kPartialSize));
ASSERT_EQ(kPartialSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kPartialSize, 0));
}
TEST_F(MemoryMappedFileTest, MapPartialRegionAtEnd) {
const size_t kFileSize = 157 * 1024;
const size_t kPartialSize = 5 * 1024 - 32;
const size_t kOffset = kFileSize - kPartialSize;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
File file(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ);
map.Initialize(file.Pass(), MemoryMappedFile::Region(kOffset, kPartialSize));
ASSERT_EQ(kPartialSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kPartialSize, kOffset));
}
TEST_F(MemoryMappedFileTest, MapSmallPartialRegionInTheMiddle) {
const size_t kFileSize = 157 * 1024;
const size_t kOffset = 1024 * 5 + 32;
const size_t kPartialSize = 8;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
File file(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ);
map.Initialize(file.Pass(), MemoryMappedFile::Region(kOffset, kPartialSize));
ASSERT_EQ(kPartialSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kPartialSize, kOffset));
}
TEST_F(MemoryMappedFileTest, MapLargePartialRegionInTheMiddle) {
const size_t kFileSize = 157 * 1024;
const size_t kOffset = 1024 * 5 + 32;
const size_t kPartialSize = 16 * 1024 - 32;
CreateTemporaryTestFile(kFileSize);
MemoryMappedFile map;
File file(temp_file_path(), File::FLAG_OPEN | File::FLAG_READ);
map.Initialize(file.Pass(), MemoryMappedFile::Region(kOffset, kPartialSize));
ASSERT_EQ(kPartialSize, map.length());
ASSERT_TRUE(map.data() != NULL);
EXPECT_TRUE(map.IsValid());
ASSERT_TRUE(CheckBufferContents(map.data(), kPartialSize, kOffset));
}
} // namespace
} // namespace base
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