mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
// Copyright 2019 Google LLC
|
|
//
|
|
// 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
|
|
//
|
|
// https://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 SANDBOXED_API_SANDBOX2_BUFFER_H_
|
|
#define SANDBOXED_API_SANDBOX2_BUFFER_H_
|
|
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
#include <memory>
|
|
|
|
#include "absl/status/statusor.h"
|
|
|
|
namespace sandbox2 {
|
|
|
|
// Buffer provides a way for executor and sandboxee to share data.
|
|
// It is useful to share large buffers instead of communicating and copying.
|
|
// The executor must distrust the content of this buffer, like everything
|
|
// else that comes under control of the sandboxee.
|
|
class Buffer final {
|
|
private:
|
|
struct Tag {};
|
|
|
|
public:
|
|
Buffer(Tag tag = {}) {}
|
|
~Buffer();
|
|
|
|
Buffer(const Buffer&) = delete;
|
|
Buffer& operator=(const Buffer&) = delete;
|
|
|
|
// Creates a new Buffer that is backed by the specified file descriptor.
|
|
// The Buffer takes ownership of the descriptor and will close it when
|
|
// destroyed.
|
|
static absl::StatusOr<std::unique_ptr<Buffer>> CreateFromFd(int fd);
|
|
|
|
// Creates a new Buffer of the specified size, backed by a temporary file that
|
|
// will be immediately deleted.
|
|
static absl::StatusOr<std::unique_ptr<Buffer>> CreateWithSize(size_t size);
|
|
|
|
// Returns a pointer to the buffer, which is read/write.
|
|
uint8_t* data() const { return buf_; }
|
|
|
|
// Gets the size of the buffer in bytes.
|
|
size_t size() const { return size_; }
|
|
|
|
// Gets the file descriptor backing the buffer.
|
|
int fd() const { return fd_; }
|
|
|
|
private:
|
|
uint8_t* buf_ = nullptr;
|
|
int fd_ = -1;
|
|
size_t size_ = 0;
|
|
};
|
|
|
|
} // namespace sandbox2
|
|
|
|
#endif // SANDBOXED_API_SANDBOX2_BUFFER_H_
|