66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SANDBOXED_API_SANDBOX2_BUFFER_H_
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#define SANDBOXED_API_SANDBOX2_BUFFER_H_
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#include <cstddef>
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#include <cstdint>
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#include <memory>
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#include "absl/status/statusor.h"
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namespace sandbox2 {
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// Buffer provides a way for executor and sandboxee to share data.
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// It is useful to share large buffers instead of communicating and copying.
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// The executor must distrust the content of this buffer, like everything
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// else that comes under control of the sandboxee.
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class Buffer final {
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public:
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~Buffer();
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Buffer(const Buffer&) = delete;
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Buffer& operator=(const Buffer&) = delete;
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// Creates a new Buffer that is backed by the specified file descriptor.
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// The Buffer takes ownership of the descriptor and will close it when
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// destroyed.
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static absl::StatusOr<std::unique_ptr<Buffer>> CreateFromFd(int fd);
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// Creates a new Buffer of the specified size, backed by a temporary file that
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// will be immediately deleted.
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static absl::StatusOr<std::unique_ptr<Buffer>> CreateWithSize(size_t size);
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// Returns a pointer to the buffer, which is read/write.
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uint8_t* data() const { return buf_; }
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// Gets the size of the buffer in bytes.
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size_t size() const { return size_; }
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// Gets the file descriptor backing the buffer.
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int fd() const { return fd_; }
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private:
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Buffer() = default;
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uint8_t* buf_ = nullptr;
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int fd_ = -1;
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size_t size_ = 0;
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};
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_BUFFER_H_
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