182 行
4.4 KiB
C++
182 行
4.4 KiB
C++
#pragma once
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//serializer: a class designed to save and restore the state of classes.
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//
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//benefits:
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//- data() will be portable in size (it is not necessary to specify type sizes.)
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//- data() will be portable in endianness (always stored internally as little-endian.)
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//- one serialize function can both save and restore class states.
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//
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//caveats:
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//- only plain-old-data can be stored. complex classes must provide serialize(serializer&);
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//- floating-point usage is not portable across different implementations
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#include <nall/array.hpp>
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#include <nall/bit.hpp>
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#include <nall/range.hpp>
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#include <nall/stdint.hpp>
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#include <nall/traits.hpp>
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#include <nall/utility.hpp>
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namespace nall {
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struct serializer;
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template<typename T>
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struct has_serialize {
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template<typename C> static auto test(decltype(std::declval<C>().serialize(std::declval<serializer&>()))*) -> char;
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template<typename C> static auto test(...) -> long;
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static constexpr bool value = sizeof(test<T>(0)) == sizeof(char);
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};
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template<typename T> constexpr bool has_serialize_v = has_serialize<T>::value;
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struct serializer {
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explicit operator bool() const {
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return _size;
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}
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auto reading() const -> bool {
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return _mode == 0;
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}
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auto writing() const -> bool {
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return _mode == 1;
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}
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auto setReading() -> void {
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_mode = 0;
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_size = 0;
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}
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auto setWriting() -> void {
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_mode = 1;
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_size = 0;
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}
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auto data() const -> const u8* {
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return _data;
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}
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auto size() const -> u32 {
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return _size;
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}
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auto capacity() const -> u32 {
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return _capacity;
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}
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auto reserve(u32 size) -> void {
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if(size > _capacity) {
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auto data = new u8[bit::round(size)]();
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memory::copy(data, _data, _capacity);
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delete[] _data;
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_data = data;
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_capacity = bit::round(size);
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}
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}
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template<typename T> auto operator()(T& value) -> serializer& {
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static_assert(has_serialize_v<T> || is_integral_v<T> || is_floating_point_v<T>);
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if constexpr(has_serialize_v<T>) {
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value.serialize(*this);
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} else if constexpr(is_integral_v<T>) {
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integer(value);
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} else if constexpr(is_floating_point_v<T>) {
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real(value);
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}
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return *this;
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}
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template<typename T, s32 N> auto operator()(T (&array)[N]) -> serializer& {
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for(auto& value : array) operator()(value);
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return *this;
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}
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template<typename T> auto operator()(array_span<T> array) -> serializer& {
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for(auto& value : array) operator()(value);
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return *this;
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}
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auto operator=(const serializer& s) -> serializer& {
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if(this == &s) return *this;
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if(_data) delete[] _data;
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_mode = s._mode;
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_data = new u8[s._capacity];
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_size = s._size;
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_capacity = s._capacity;
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memory::copy(_data, s._data, s._capacity);
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return *this;
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}
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auto operator=(serializer&& s) -> serializer& {
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if(this == &s) return *this;
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if(_data) delete[] _data;
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_mode = s._mode;
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_data = s._data;
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_size = s._size;
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_capacity = s._capacity;
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s._data = nullptr;
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return *this;
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}
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serializer(const serializer& s) { operator=(s); }
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serializer(serializer&& s) { operator=(std::move(s)); }
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serializer() {
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setWriting();
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_data = new u8[1024 * 1024]();
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_size = 0;
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_capacity = 1024 * 1024;
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}
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serializer(const u8* data, u32 capacity) {
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setReading();
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_data = new u8[capacity]();
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_size = 0;
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_capacity = capacity;
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memory::copy(_data, data, capacity);
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}
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~serializer() {
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if(_data) delete[] _data;
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}
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private:
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template<typename T> auto integer(T& value) -> serializer& {
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enum : u32 { size = std::is_same<bool, T>::value ? 1 : sizeof(T) };
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reserve(_size + size);
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if(writing()) {
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for(u32 n : range(size)) _data[_size++] = value >> (n << 3);
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} else if(reading()) {
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value = 0;
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for(u32 n : range(size)) value |= (T)_data[_size++] << (n << 3);
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}
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return *this;
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}
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template<typename T> auto real(T& value) -> serializer& {
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enum : u32 { size = sizeof(T) };
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reserve(_size + size);
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//this is rather dangerous, and not cross-platform safe;
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//but there is no standardized way to export floating point values
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auto p = (u8*)&value;
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if(writing()) {
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for(u32 n : range(size)) _data[_size++] = p[n];
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} else if(reading()) {
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for(u32 n : range(size)) p[n] = _data[_size++];
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}
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return *this;
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}
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bool _mode = 0;
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u8* _data = nullptr;
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u32 _size = 0;
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u32 _capacity = 0;
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};
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}
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