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starboard/nplb/posix_compliance/posix_file_write_test.cc
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// Copyright 2024 The Cobalt Authors. All Rights Reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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// Writing is partially tested by some of the file helpers that create files | ||
// for the tests to operate on. | ||
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#include <fcntl.h> | ||
#include <unistd.h> | ||
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#include <string> | ||
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#include "starboard/common/file.h" | ||
#include "starboard/nplb/file_helpers.h" | ||
#include "testing/gtest/include/gtest/gtest.h" | ||
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namespace starboard { | ||
namespace nplb { | ||
namespace { | ||
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// Sets up an empty test fixture, required for typed tests. | ||
template <class SbFileWriteType> | ||
class PosixFileWriteTest : public testing::Test {}; | ||
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class PosixFileWriter { | ||
public: | ||
static ssize_t Write(int file, char* data, size_t size) { | ||
return write(file, data, size); | ||
} | ||
}; | ||
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class PosixFileWriterAll { | ||
public: | ||
static ssize_t Write(int file, char* data, size_t size) { | ||
return WriteAll(file, data, size); | ||
} | ||
}; | ||
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typedef testing::Types<PosixFileWriter, PosixFileWriterAll> | ||
PosixFileWriteTestTypes; | ||
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TYPED_TEST_CASE(PosixFileWriteTest, PosixFileWriteTestTypes); | ||
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const int kBufferLength = 16 * 1024; | ||
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TYPED_TEST(PosixFileWriteTest, InvalidFileErrors) { | ||
char buffer[kBufferLength] = {0}; | ||
int result = TypeParam::Write(-1, buffer, kBufferLength); | ||
EXPECT_EQ(-1, result); | ||
} | ||
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TYPED_TEST(PosixFileWriteTest, BasicWriting) { | ||
// Choose a file size that is not an even multiple of the buffer size, but | ||
// is over several times the size of the buffer. | ||
const int kFileSize = kBufferLength * 16 / 3; | ||
ScopedRandomFile random_file(0, ScopedRandomFile::kDontCreate); | ||
const std::string& filename = random_file.filename(); | ||
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int file = open(filename.c_str(), O_RDWR | O_CREAT | O_TRUNC); | ||
ASSERT_TRUE(file >= 0); | ||
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// Create a bigger buffer than necessary, so we can test the memory around | ||
// the portion given to SbFileRead. | ||
char buffer[kBufferLength] = {0}; | ||
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// Initialize to some arbitrary pattern so we can verify it later. | ||
for (int i = 0; i < kBufferLength; ++i) { | ||
buffer[i] = static_cast<char>(i & 0xFF); | ||
} | ||
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// Read and check the whole file. | ||
int total = 0; | ||
while (true) { | ||
if (total == kFileSize) { | ||
break; | ||
} | ||
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int remaining = kFileSize - total; | ||
int to_write = remaining < kBufferLength ? remaining : kBufferLength; | ||
int bytes_written = | ||
TypeParam::Write(file, buffer + (total % kBufferLength), to_write); | ||
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// Check that we didn't write more than the buffer size. | ||
EXPECT_GE(to_write, bytes_written); | ||
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// Check that we didn't get an error. | ||
ASSERT_LT(0, bytes_written); | ||
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total += bytes_written; | ||
EXPECT_EQ(total, lseek(file, 0, SEEK_CUR)); | ||
} | ||
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// Tests reading and writing from same opened file. | ||
int result = fsync(file); | ||
ASSERT_TRUE(result == 0); | ||
int position = static_cast<int>(lseek(file, 0, SEEK_SET)); | ||
ASSERT_EQ(0, position); | ||
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// Read and check the whole file. | ||
total = 0; | ||
int previous_total = 0; | ||
while (true) { | ||
int bytes_read = ReadAll(file, buffer, kBufferLength); | ||
if (bytes_read == 0) { | ||
break; | ||
} | ||
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// Check that we didn't read more than the buffer size. | ||
EXPECT_GE(kBufferLength, bytes_read); | ||
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// Check that we didn't get an error. | ||
ASSERT_LT(0, bytes_read); | ||
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// Do some accounting to check later. | ||
previous_total = total; | ||
total += bytes_read; | ||
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ScopedRandomFile::ExpectPattern(previous_total, buffer, bytes_read, | ||
__LINE__); | ||
} | ||
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// Check that we read the whole file. | ||
EXPECT_EQ(kFileSize, total); | ||
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result = close(file); | ||
EXPECT_TRUE(result == 0); | ||
} | ||
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TYPED_TEST(PosixFileWriteTest, WriteZeroBytes) { | ||
ScopedRandomFile random_file(0, ScopedRandomFile::kDontCreate); | ||
const std::string& filename = random_file.filename(); | ||
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int file = open(filename.c_str(), O_CREAT | O_EXCL | O_WRONLY); | ||
ASSERT_TRUE(file >= 0); | ||
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char buffer[kBufferLength] = {0}; | ||
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// Write zero bytes. | ||
for (int i = 0; i < 10; ++i) { | ||
int bytes_written = TypeParam::Write(file, buffer, 0); | ||
EXPECT_EQ(0, bytes_written); | ||
} | ||
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int result = close(file); | ||
EXPECT_TRUE(result == 0); | ||
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file = open(filename.c_str(), O_RDONLY); | ||
ASSERT_TRUE(file >= 0); | ||
struct stat info; | ||
result = fstat(file, &info); | ||
EXPECT_TRUE(result == 0); | ||
EXPECT_EQ(0, info.st_size); | ||
result = close(file); | ||
EXPECT_TRUE(result == 0); | ||
} | ||
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} // namespace | ||
} // namespace nplb | ||
} // namespace starboard |
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