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68 lines
2.1 KiB
68 lines
2.1 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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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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* http://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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*/
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#ifndef NETUTILS_MEMBLOCK_H
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#define NETUTILS_MEMBLOCK_H
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#include <memory>
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#include "netdutils/Slice.h"
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namespace android {
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namespace netdutils {
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// A class to encapsulate self-deleting byte arrays while preserving access
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// to the underlying length (without the length being part of the type, e.g.
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// std::array<>). By design, the only interface to the underlying bytes is
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// via Slice, to encourage safer memory access usage.
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//
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// No thread-safety guarantees whatsoever.
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class MemBlock {
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public:
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MemBlock() : MemBlock(0U) {}
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explicit MemBlock(size_t len)
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: mData((len > 0U) ? new uint8_t[len]{} : nullptr),
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mLen(len) {}
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// Allocate memory of size src.size() and copy src into this MemBlock.
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explicit MemBlock(Slice src) : MemBlock(src.size()) {
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copy(get(), src);
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}
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// No copy construction or assignment.
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MemBlock(const MemBlock&) = delete;
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MemBlock& operator=(const MemBlock&) = delete;
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// Move construction and assignment are okay.
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MemBlock(MemBlock&&) = default;
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MemBlock& operator=(MemBlock&&) = default;
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// Even though this method is const, the memory wrapped by the
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// returned Slice is mutable.
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Slice get() const noexcept { return Slice(mData.get(), mLen); }
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// Implicit cast to Slice.
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// NOLINTNEXTLINE(google-explicit-constructor)
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operator const Slice() const noexcept { return get(); }
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private:
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std::unique_ptr<uint8_t[]> mData;
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size_t mLen;
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};
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} // namespace netdutils
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} // namespace android
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#endif /* NETUTILS_MEMBLOCK_H */
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