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/*
* Copyright (C) 2017 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 AAPT_IO_FILESTREAM_H
#define AAPT_IO_FILESTREAM_H
#include "io/Io.h"
#include <memory>
#include <string>
#include "android-base/macros.h"
#include "android-base/unique_fd.h"
namespace aapt {
namespace io {
constexpr size_t kDefaultBufferCapacity = 4096u;
class FileInputStream : public InputStream {
public:
explicit FileInputStream(const std::string& path,
size_t buffer_capacity = kDefaultBufferCapacity);
// Take ownership of `fd`.
explicit FileInputStream(int fd, size_t buffer_capacity = kDefaultBufferCapacity);
bool Next(const void** data, size_t* size) override;
void BackUp(size_t count) override;
size_t ByteCount() const override;
bool HadError() const override;
std::string GetError() const override;
private:
DISALLOW_COPY_AND_ASSIGN(FileInputStream);
android::base::unique_fd fd_;
std::string error_;
std::unique_ptr<uint8_t[]> buffer_;
size_t buffer_capacity_ = 0u;
size_t buffer_offset_ = 0u;
size_t buffer_size_ = 0u;
size_t total_byte_count_ = 0u;
};
class FileOutputStream : public OutputStream {
public:
explicit FileOutputStream(const std::string& path,
size_t buffer_capacity = kDefaultBufferCapacity);
// Does not take ownership of `fd`.
explicit FileOutputStream(int fd, size_t buffer_capacity = kDefaultBufferCapacity);
// Takes ownership of `fd`.
explicit FileOutputStream(android::base::unique_fd fd,
size_t buffer_capacity = kDefaultBufferCapacity);
~FileOutputStream();
bool Next(void** data, size_t* size) override;
// Immediately flushes out the contents of the buffer to disk.
bool Flush();
void BackUp(size_t count) override;
size_t ByteCount() const override;
bool HadError() const override;
std::string GetError() const override;
private:
DISALLOW_COPY_AND_ASSIGN(FileOutputStream);
bool FlushImpl();
android::base::unique_fd owned_fd_;
int fd_;
std::string error_;
std::unique_ptr<uint8_t[]> buffer_;
size_t buffer_capacity_ = 0u;
size_t buffer_offset_ = 0u;
size_t total_byte_count_ = 0u;
};
} // namespace io
} // namespace aapt
#endif // AAPT_IO_FILESTREAM_H
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