file_random_access_stream.h
// Copyright 2019 Google Inc.
//
// 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 TINK_UTIL_FILE_RANDOM_ACCESS_STREAM_H_
#define TINK_UTIL_FILE_RANDOM_ACCESS_STREAM_H_
#include <cstdint>
#include <memory>
#include "tink/random_access_stream.h"
#include "tink/util/buffer.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace util {
// An RandomAccessStream that reads from a file descriptor.
//
// NOTE: This class in not available when building on Windows.
class FileRandomAccessStream : public crypto::tink::RandomAccessStream {
public:
// Constructs a FileRandomAccessStream that will read from the file specified
// via 'file_descriptor'.
// Takes the ownership of the file, and will close it upon destruction.
explicit FileRandomAccessStream(int file_descriptor);
~FileRandomAccessStream() override;
crypto::tink::util::Status PRead(int64_t position,
int count,
Buffer* dest_buffer) override;
crypto::tink::util::StatusOr<int64_t> size() override;
private:
int fd_;
};
} // namespace util
} // namespace tink
} // namespace crypto
#endif // TINK_UTIL_FILE_RANDOM_ACCESS_STREAM_H_