146 lines
4.2 KiB
C++
146 lines
4.2 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/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 const bool value = sizeof(test<T>(0)) == sizeof(char);
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};
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struct serializer {
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enum Mode : uint { Load, Save, Size };
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auto mode() const -> Mode {
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return _mode;
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}
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auto data() const -> const uint8_t* {
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return _data;
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}
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auto size() const -> uint {
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return _size;
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}
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auto capacity() const -> uint {
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return _capacity;
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}
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template<typename T> auto floatingpoint(T& value) -> serializer& {
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enum { size = sizeof(T) };
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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 FP-values
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auto p = (uint8_t*)&value;
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if(_mode == Save) {
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for(uint n = 0; n < size; n++) _data[_size++] = p[n];
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} else if(_mode == Load) {
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for(uint n = 0; n < size; n++) p[n] = _data[_size++];
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} else {
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_size += size;
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}
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return *this;
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}
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template<typename T> auto integer(T& value) -> serializer& {
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enum { size = std::is_same<bool, T>::value ? 1 : sizeof(T) };
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if(_mode == Save) {
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for(uint n = 0; n < size; n++) _data[_size++] = (uintmax_t)value >> (n << 3);
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} else if(_mode == Load) {
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value = 0;
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for(uint n = 0; n < size; n++) value |= (uintmax_t)_data[_size++] << (n << 3);
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} else if(_mode == Size) {
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_size += size;
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}
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return *this;
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}
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template<typename T, int N> auto array(T (&array)[N]) -> serializer& {
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for(uint n = 0; n < N; n++) operator()(array[n]);
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return *this;
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}
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template<typename T> auto array(T array, uint size) -> serializer& {
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for(uint n = 0; n < size; n++) operator()(array[n]);
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return *this;
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}
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template<typename T> auto operator()(T& value, typename std::enable_if<has_serialize<T>::value>::type* = 0) -> serializer& { value.serialize(*this); return *this; }
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template<typename T> auto operator()(T& value, typename std::enable_if<std::is_integral<T>::value>::type* = 0) -> serializer& { return integer(value); }
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template<typename T> auto operator()(T& value, typename std::enable_if<std::is_floating_point<T>::value>::type* = 0) -> serializer& { return floatingpoint(value); }
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template<typename T> auto operator()(T& value, typename std::enable_if<std::is_array<T>::value>::type* = 0) -> serializer& { return array(value); }
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template<typename T> auto operator()(T& value, uint size, typename std::enable_if<std::is_pointer<T>::value>::type* = 0) -> serializer& { return array(value, size); }
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auto operator=(const serializer& s) -> serializer& {
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if(_data) delete[] _data;
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_mode = s._mode;
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_data = new uint8_t[s._capacity];
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_size = s._size;
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_capacity = s._capacity;
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memcpy(_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(_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() = default;
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serializer(const serializer& s) { operator=(s); }
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serializer(serializer&& s) { operator=(move(s)); }
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serializer(uint capacity) {
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_mode = Save;
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_data = new uint8_t[capacity]();
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_size = 0;
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_capacity = capacity;
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}
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serializer(const uint8_t* data, uint capacity) {
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_mode = Load;
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_data = new uint8_t[capacity];
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_size = 0;
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_capacity = capacity;
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memcpy(_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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Mode _mode = Size;
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uint8_t* _data = nullptr;
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uint _size = 0;
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uint _capacity = 0;
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};
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};
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