103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
/*
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* Copyright (c) 2023, Alibaba Group Holding Limited;
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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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#pragma once
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#include <cassert>
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#include <cstdint>
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#include <cstring>
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#include <vector>
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#if defined __clang__
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#define STRUCT_PB_INLINE __attribute__((always_inline)) inline
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#elif defined _MSC_VER
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#define STRUCT_PB_INLINE __forceinline
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#else
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#define STRUCT_PB_INLINE __attribute__((always_inline)) inline
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#endif
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#define STRUCT_PB_NODISCARD [[nodiscard]]
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namespace struct_pb {
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struct UnknownFields {
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STRUCT_PB_NODISCARD std::size_t total_size() const {
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std::size_t total = 0;
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for (const auto& f : fields) {
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total += f.len;
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}
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return total;
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}
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void serialize_to(char* data, std::size_t& pos, std::size_t size) const {
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for (const auto& f : fields) {
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assert(pos + f.len <= size);
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std::memcpy(data + pos, f.data, f.len);
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pos += f.len;
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}
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}
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void add_field(const char* data, std::size_t start, std::size_t end) {
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fields.push_back(Field{data + start, end - start});
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}
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struct Field {
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const char* data;
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std::size_t len;
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};
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std::vector<Field> fields;
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};
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/*
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* Low-Level API for struct_pb user
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* the following internal API will be generated by struct_pb protoc plugin
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*/
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namespace internal {
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template <typename T>
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STRUCT_PB_NODISCARD std::size_t get_needed_size(
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const T& t, const UnknownFields& unknown_fields = {});
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template <typename T>
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void serialize_to(char* data, std::size_t size, const T& t,
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const UnknownFields& unknown_fields = {});
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template <typename T>
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STRUCT_PB_NODISCARD bool deserialize_to(T& t, const char* data,
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std::size_t size,
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UnknownFields& unknown_fields);
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template <typename T>
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STRUCT_PB_NODISCARD bool deserialize_to(T& t, const char* data,
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std::size_t size);
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} // namespace internal
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/*
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* High-Level API for struct_pb user
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* If you need more fine-grained operations, encapsulate the internal API
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* yourself.
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*/
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template <typename Buffer = std::vector<char>, typename T>
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STRUCT_PB_NODISCARD Buffer serialize(const T& t,
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const UnknownFields& unknown_fields = {}) {
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Buffer buffer;
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auto size = struct_pb::internal::get_needed_size(t, unknown_fields);
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buffer.resize(size);
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struct_pb::internal::serialize_to(buffer.data(), buffer.size(), t,
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unknown_fields);
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return buffer;
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}
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template <typename T, typename Buffer>
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STRUCT_PB_NODISCARD STRUCT_PB_INLINE bool deserialize_to(
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T& t, UnknownFields& unknown_fields, const Buffer& buffer) {
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return struct_pb::internal::deserialize_to(t, buffer.data(), buffer.size(),
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unknown_fields);
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}
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template <typename T, typename Buffer>
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STRUCT_PB_NODISCARD STRUCT_PB_INLINE bool deserialize_to(T& t,
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const Buffer& buffer) {
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return struct_pb::internal::deserialize_to(t, buffer.data(), buffer.size());
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}
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} // namespace struct_pb
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