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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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.
*/
#ifndef BASE_UNIX_FILE_RANDOM_ACCESS_FILE_TEST_H_
#define BASE_UNIX_FILE_RANDOM_ACCESS_FILE_TEST_H_
#include <errno.h>
#include <string>
#include "common_test.h"
#include "gtest/gtest.h"
#include "UniquePtr.h"
namespace unix_file {
class RandomAccessFileTest : public testing::Test {
protected:
virtual ~RandomAccessFileTest() {
}
// Override this to return an instance of the subclass under test that's
// backed by a temporary file.
virtual RandomAccessFile* MakeTestFile() = 0;
virtual void SetUp() {
art::CommonTest::SetEnvironmentVariables(android_data_);
}
std::string GetTmpPath(const std::string& name) {
std::string path;
path = android_data_;
path += "/";
path += name;
return path;
}
// TODO(enh): ReadString (and WriteString) might be generally useful.
static bool ReadString(RandomAccessFile* f, std::string* s) {
s->clear();
char buf[256];
int64_t n = 0;
int64_t offset = 0;
while ((n = f->Read(buf, sizeof(buf), offset)) > 0) {
s->append(buf, n);
offset += n;
}
return n != -1;
}
void TestRead() {
char buf[256];
UniquePtr<RandomAccessFile> file(MakeTestFile());
// Reading from the start of an empty file gets you zero bytes, however many
// you ask for.
ASSERT_EQ(0, file->Read(buf, 0, 0));
ASSERT_EQ(0, file->Read(buf, 123, 0));
const std::string content("hello");
ASSERT_EQ(content.size(), file->Write(content.data(), content.size(), 0));
TestReadContent(content, file.get());
}
void TestReadContent(const std::string& content, RandomAccessFile* file) {
const int buf_size = content.size() + 10;
UniquePtr<char> buf(new char[buf_size]);
// Can't read from a negative offset.
ASSERT_EQ(-EINVAL, file->Read(buf.get(), 0, -123));
// Reading too much gets us just what's in the file.
ASSERT_EQ(content.size(), file->Read(buf.get(), buf_size, 0));
ASSERT_EQ(std::string(buf.get(), content.size()), content);
// We only get as much as we ask for.
const size_t short_request = 2;
ASSERT_LT(short_request, content.size());
ASSERT_EQ(short_request, file->Read(buf.get(), short_request, 0));
ASSERT_EQ(std::string(buf.get(), short_request),
content.substr(0, short_request));
// We don't have to start at the beginning.
const int non_zero_offset = 2;
ASSERT_GT(non_zero_offset, 0);
ASSERT_EQ(short_request,
file->Read(buf.get(), short_request, non_zero_offset));
ASSERT_EQ(std::string(buf.get(), short_request),
content.substr(non_zero_offset, short_request));
// Reading past the end gets us nothing.
ASSERT_EQ(0, file->Read(buf.get(), buf_size, file->GetLength()));
ASSERT_EQ(0, file->Read(buf.get(), buf_size, file->GetLength() + 1));
}
void TestSetLength() {
const std::string content("hello");
UniquePtr<RandomAccessFile> file(MakeTestFile());
ASSERT_EQ(content.size(), file->Write(content.data(), content.size(), 0));
ASSERT_EQ(content.size(), file->GetLength());
// Can't give a file a negative length.
ASSERT_EQ(-EINVAL, file->SetLength(-123));
// Can truncate the file.
int64_t new_length = 2;
ASSERT_EQ(0, file->SetLength(new_length));
ASSERT_EQ(new_length, file->GetLength());
std::string new_content;
ASSERT_TRUE(ReadString(file.get(), &new_content));
ASSERT_EQ(content.substr(0, 2), new_content);
// Expanding the file appends zero bytes.
new_length = file->GetLength() + 1;
ASSERT_EQ(0, file->SetLength(new_length));
ASSERT_EQ(new_length, file->GetLength());
ASSERT_TRUE(ReadString(file.get(), &new_content));
ASSERT_EQ('\0', new_content[new_length - 1]);
}
void TestWrite() {
const std::string content("hello");
UniquePtr<RandomAccessFile> file(MakeTestFile());
// Can't write to a negative offset.
ASSERT_EQ(-EINVAL, file->Write(content.data(), 0, -123));
// Writing zero bytes of data is a no-op.
ASSERT_EQ(0, file->Write(content.data(), 0, 0));
ASSERT_EQ(0, file->GetLength());
// We can write data.
ASSERT_EQ(content.size(), file->Write(content.data(), content.size(), 0));
ASSERT_EQ(content.size(), file->GetLength());
std::string new_content;
ASSERT_TRUE(ReadString(file.get(), &new_content));
ASSERT_EQ(new_content, content);
// We can read it back.
char buf[256];
ASSERT_EQ(content.size(), file->Read(buf, sizeof(buf), 0));
ASSERT_EQ(std::string(buf, content.size()), content);
// We can append data past the end.
ASSERT_EQ(content.size(),
file->Write(content.data(), content.size(), file->GetLength() + 1));
int64_t new_length = 2*content.size() + 1;
ASSERT_EQ(file->GetLength(), new_length);
ASSERT_TRUE(ReadString(file.get(), &new_content));
ASSERT_EQ(std::string("hello\0hello", new_length), new_content);
}
protected:
std::string android_data_;
};
} // namespace unix_file
#endif // BASE_UNIX_FILE_RANDOM_ACCESS_FILE_TEST_H_
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