mirror of
https://github.com/boostorg/mqtt5.git
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927c1c6e3a
Summary: related to T13767 T13767 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D29686
511 lines
12 KiB
C++
511 lines
12 KiB
C++
//
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// Copyright (c) 2023-2024 Ivica Siladic, Bruno Iljazovic, Korina Simicevic
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASYNC_MQTT5_BASE_ENCODERS_HPP
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#define ASYNC_MQTT5_BASE_ENCODERS_HPP
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#include <cstddef>
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#include <cstdint>
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#include <boost/core/identity.hpp>
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#include <boost/endian/conversion.hpp>
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#include <boost/type_traits/is_detected_exact.hpp>
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#include <boost/type_traits/remove_cv_ref.hpp>
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#include <async_mqtt5/property_types.hpp>
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#include <async_mqtt5/impl/codecs/traits.hpp>
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namespace async_mqtt5::encoders {
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namespace basic {
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using varint_t = int*;
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inline void to_variable_bytes(std::string& s, int32_t val) {
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if (val > 0xfffffff) return;
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while (val > 127) {
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s.push_back(char((val & 0b01111111) | 0b10000000));
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val >>= 7;
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}
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s.push_back(val & 0b01111111);
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}
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inline size_t variable_length(int32_t val) {
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if (val > 0xfffffff) return 0;
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size_t rv = 1;
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for (; val > 127; ++rv) val >>= 7;
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return rv;
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}
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struct encoder {};
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template <size_t bits, typename repr = uint8_t>
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class flag_def : public encoder {
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template <size_t num_bits>
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using least_type = std::conditional_t<
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num_bits <= 8, uint8_t,
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std::conditional_t<
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num_bits <= 16, uint16_t,
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std::conditional_t<
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num_bits <= 32, uint32_t,
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std::conditional_t<num_bits <= 64, uint64_t, void>
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>
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>
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>;
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template <size_t oth_bits, typename oth_repr>
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friend class flag_def;
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repr _val { 0 };
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public:
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flag_def(repr val) : _val(val) {}
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flag_def() = default;
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template <
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typename T,
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typename projection = boost::identity,
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std::enable_if_t<is_optional<T>, bool> = true
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>
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auto operator()(T&& value, projection proj = {}) const {
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if constexpr (std::is_same_v<projection, boost::identity>) {
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repr val = value.has_value();
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return flag_def<bits, repr> { val };
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}
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else {
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repr val = value.has_value() ?
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static_cast<repr>(std::invoke(proj, *value)) : 0;
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return flag_def<bits, repr> { val };
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}
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}
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template <
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typename T,
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typename projection = boost::identity,
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std::enable_if_t<!is_optional<T>, bool> = true
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>
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auto operator()(T&& value, projection proj = {}) const {
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auto val = static_cast<repr>(std::invoke(proj, value));
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return flag_def<bits, repr> { val };
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}
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size_t byte_size() const { return sizeof(repr); }
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template <size_t rhs_bits, typename rhs_repr>
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auto operator|(const flag_def<rhs_bits, rhs_repr>& rhs) const {
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using res_repr = least_type<bits + rhs_bits>;
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auto val = static_cast<res_repr>((_val << rhs_bits) | rhs._val);
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return flag_def<bits + rhs_bits, res_repr> { val };
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}
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std::string& encode(std::string& s) const {
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using namespace boost::endian;
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size_t sz = s.size(); s.resize(sz + sizeof(repr));
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auto p = reinterpret_cast<uint8_t*>(s.data() + sz);
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endian_store<repr, sizeof(repr), order::big>(p, _val);
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return s;
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}
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};
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template <size_t bits, typename repr = uint8_t>
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constexpr auto flag = flag_def<bits, repr>{};
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template <typename T, typename Repr>
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class int_val : public encoder {
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T _val;
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public:
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int_val(T val) : _val(val) {}
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size_t byte_size() const {
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if constexpr (is_optional<T>) {
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if (_val) return val_length(*_val);
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return 0;
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}
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else
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return val_length(_val);
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}
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std::string& encode(std::string& s) const {
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if constexpr (is_optional<T>) {
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if (_val) return encode_val(s, *_val);
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return s;
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}
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else
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return encode_val(s, _val);
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}
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private:
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template <typename U>
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static size_t val_length(U&& val) {
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if constexpr (std::is_same_v<Repr, varint_t>)
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return variable_length(int32_t(val));
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else
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return sizeof(Repr);
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}
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template <typename U>
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static std::string& encode_val(std::string& s, U&& val) {
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using namespace boost::endian;
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if constexpr (std::is_same_v<Repr, varint_t>) {
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to_variable_bytes(s, int32_t(val));
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return s;
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}
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else {
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size_t sz = s.size(); s.resize(sz + sizeof(Repr));
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auto p = reinterpret_cast<uint8_t*>(s.data() + sz);
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endian_store<Repr, sizeof(Repr), order::big>(p, val);
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return s;
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}
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}
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};
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template <typename Repr>
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class int_def {
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public:
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template <typename T>
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auto operator()(T&& val) const {
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return int_val<T, Repr> { std::forward<T>(val) };
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}
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template <typename T, typename projection>
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auto operator()(T&& val, projection proj) const {
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if constexpr (is_optional<T>) {
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using rv_type = std::invoke_result_t<
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projection, typename boost::remove_cv_ref_t<T>::value_type
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>;
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if (val.has_value())
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return (*this)(std::invoke(proj, *val));
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return int_val<rv_type, Repr> { rv_type {} };
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}
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else {
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using rv_type = std::invoke_result_t<projection, T>;
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return int_val<rv_type, Repr> { std::invoke(proj, val) };
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}
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}
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};
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constexpr auto byte_ = int_def<uint8_t> {};
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constexpr auto int16_ = int_def<uint16_t> {};
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constexpr auto int32_ = int_def<uint32_t> {};
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constexpr auto varlen_ = int_def<varint_t> {};
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template <typename T>
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class array_val : public encoder {
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T _val;
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bool _with_length;
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public:
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array_val(T val, bool with_length) :
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_val(val), _with_length(with_length)
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{
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static_assert(
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std::is_reference_v<T> || std::is_same_v<T, std::string_view>
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);
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}
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size_t byte_size() const {
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if constexpr (is_optional<T>)
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return _val ? _with_length * 2 + val_length(*_val) : 0;
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else
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return _with_length * 2 + val_length(_val);
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}
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std::string& encode(std::string& s) const {
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if constexpr (is_optional<T>) {
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if (_val) return encode_val(s, *_val);
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return s;
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}
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else
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return encode_val(s, _val);
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}
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private:
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template <typename V>
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using has_size = decltype(std::declval<V&>().size());
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template <typename U>
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static size_t val_length(U&& val) {
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if constexpr (std::is_same_v<boost::remove_cv_ref_t<U>, const char*>)
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return std::strlen(val);
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if constexpr (boost::is_detected_exact_v<size_t, has_size, U>)
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return val.size();
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else // fallback to type const char (&)[N] (substract 1 for trailing 0)
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return sizeof(val) - 1;
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}
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template <typename U>
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std::string& encode_val(std::string& s, U&& u) const {
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using namespace boost::endian;
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auto byte_len = val_length(std::forward<U>(u));
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if (byte_len == 0 && !_with_length) return s;
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if (_with_length) {
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size_t sz = s.size(); s.resize(sz + 2);
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auto p = reinterpret_cast<uint8_t*>(s.data() + sz);
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endian_store<int16_t, sizeof(int16_t), order::big>(
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p, int16_t(byte_len)
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);
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}
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s.append(std::begin(u), std::begin(u) + byte_len);
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return s;
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}
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};
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template <bool with_length = true>
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class array_def {
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public:
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template <typename T>
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auto operator()(T&& val) const {
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return array_val<T> { std::forward<T>(val), with_length };
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}
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template <typename T, typename projection>
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auto operator()(T&& val, projection proj) const {
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if constexpr (is_optional<T>) {
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using rv_type = std::invoke_result_t<
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projection, typename boost::remove_cv_ref_t<T>::value_type
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>;
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if (val.has_value())
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return (*this)(std::invoke(proj, *val));
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return array_val<rv_type> { rv_type {}, false };
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}
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else {
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const auto& av = std::invoke(proj, val);
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return array_val<T> { av, true };
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}
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}
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};
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using utf8_def = array_def<true>;
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constexpr auto utf8_ = utf8_def {};
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constexpr auto binary_ = array_def<true> {}; // for now
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constexpr auto verbatim_ = array_def<false> {};
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template <typename T, typename U>
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class composed_val : public encoder {
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T _lhs; U _rhs;
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public:
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composed_val(T lhs, U rhs) :
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_lhs(std::forward<T>(lhs)), _rhs(std::forward<U>(rhs))
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{}
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size_t byte_size() const {
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return _lhs.byte_size() + _rhs.byte_size();
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}
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std::string& encode(std::string& s) const {
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_lhs.encode(s);
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return _rhs.encode(s);
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}
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};
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template <
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typename T, typename U,
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std::enable_if_t<
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std::is_base_of_v<encoder, std::decay_t<T>> &&
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std::is_base_of_v<encoder, std::decay_t<U>>,
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bool
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> = true
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>
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inline auto operator&(T&& t, U&& u) {
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return composed_val(std::forward<T>(t), std::forward<U>(u));
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}
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template <
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typename T,
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std::enable_if_t<std::is_base_of_v<encoder, std::decay_t<T>>, bool> = true
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>
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std::string& operator<<(std::string& s, T&& t) {
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return t.encode(s);
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}
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} // end namespace basic
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namespace prop {
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namespace pp = async_mqtt5::prop;
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template <typename T>
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auto encoder_for_prop_value(const T& val) {
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if constexpr (std::is_same_v<T, uint8_t>)
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return basic::int_def<uint8_t>{}(val);
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else if constexpr (std::is_same_v<T, uint16_t>)
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return basic::int_def<uint16_t>{}(val);
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else if constexpr (std::is_same_v<T, int32_t>)
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return basic::int_def<basic::varint_t>{}(val);
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else if constexpr (std::is_same_v<T, uint32_t>)
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return basic::int_def<uint32_t>{}(val);
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else if constexpr (std::is_same_v<T, std::string>)
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return basic::utf8_def{}(val);
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else if constexpr (is_pair<T>)
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return encoder_for_prop_value(val.first) &
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encoder_for_prop_value(val.second);
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}
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template <typename T, pp::property_type p, typename Enable = void>
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class prop_val;
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template <
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typename T, pp::property_type p
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>
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class prop_val<
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T, p,
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std::enable_if_t<!is_vector<T> && is_optional<T>>
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> : public basic::encoder {
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// allows T to be reference type to std::optional
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static inline boost::remove_cv_ref_t<T> nulltype;
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T _val;
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public:
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prop_val(T val) : _val(val) {
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static_assert(std::is_reference_v<T>);
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}
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prop_val() : _val(nulltype) {}
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size_t byte_size() const {
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if (!_val) return 0;
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return 1 + encoder_for_prop_value(*_val).byte_size();
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}
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std::string& encode(std::string& s) const {
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if (!_val)
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return s;
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s.push_back(p);
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return encoder_for_prop_value(*_val).encode(s);
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}
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};
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template <
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typename T, pp::property_type p
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>
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class prop_val<
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T, p,
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std::enable_if_t<is_vector<T> || is_small_vector<T>>
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> : public basic::encoder {
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// allows T to be reference type to std::vector
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static inline boost::remove_cv_ref_t<T> nulltype;
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T _val;
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public:
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prop_val(T val) : _val(val) {
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static_assert(std::is_reference_v<T>);
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}
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prop_val() : _val(nulltype) { }
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size_t byte_size() const {
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if (_val.empty()) return 0;
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size_t total_size = 0;
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for (const auto& elem : _val)
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total_size += 1 + encoder_for_prop_value(elem).byte_size();
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return total_size;
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}
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std::string& encode(std::string& s) const {
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if (_val.empty())
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return s;
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for (const auto& elem: _val) {
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s.push_back(p);
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encoder_for_prop_value(elem).encode(s);
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}
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return s;
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}
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};
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template <typename Props>
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class props_val : public basic::encoder {
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static inline std::decay_t<Props> nulltype;
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template <pp::property_type P, typename T>
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static auto to_prop_val(const T& val) {
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return prop_val<const T&, P>(val);
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}
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template <pp::property_type ...Ps>
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static auto to_prop_vals(const pp::properties<Ps...>& props) {
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return std::make_tuple(
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to_prop_val<Ps>(
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props[std::integral_constant<pp::property_type, Ps> {}]
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)...
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);
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}
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template <typename Func>
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auto apply_each(Func&& func) const {
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return std::apply([&func](const auto&... props) {
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return (std::invoke(func, props), ...);
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}, _prop_vals);
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}
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decltype(to_prop_vals(std::declval<Props>())) _prop_vals;
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bool _may_omit;
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public:
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props_val(Props val, bool may_omit) :
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_prop_vals(to_prop_vals(val)), _may_omit(may_omit)
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{
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static_assert(std::is_reference_v<Props>);
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}
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props_val(bool may_omit) :
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_prop_vals(to_prop_vals(nulltype)), _may_omit(may_omit)
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{}
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size_t byte_size() const {
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size_t psize = props_size();
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if (_may_omit && psize == 0) return 0;
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return psize + basic::varlen_(psize).byte_size();
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}
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std::string& encode(std::string& s) const {
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size_t psize = props_size();
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if (_may_omit && psize == 0) return s;
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basic::varlen_(psize).encode(s);
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apply_each([&s](const auto& pv) { return pv.encode(s); });
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return s;
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}
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private:
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size_t props_size() const {
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size_t retval = 0;
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apply_each([&retval](const auto& pv) {
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return retval += pv.byte_size();
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});
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return retval;
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}
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};
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template <bool may_omit>
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class props_def {
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public:
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template <typename T>
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auto operator()(T&& prop_container) const {
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if constexpr (is_optional<T>) {
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if (prop_container.has_value())
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return (*this)(*prop_container);
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return props_val<
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const typename boost::remove_cv_ref_t<T>::value_type&
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>(true);
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}
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else {
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return props_val<T> { prop_container, may_omit };
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}
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}
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};
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constexpr auto props_ = props_def<false> {};
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constexpr auto props_may_omit_ = props_def<true> {};
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} // end namespace prop
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} // end namespace async_mqtt5::encoders
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#endif // !ASYNC_MQTT5_BASE_ENCODERS_HPP
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