mirror of
https://github.com/LizardByte/Sunshine.git
synced 2024-11-18 11:10:04 +00:00
596 lines
13 KiB
C++
596 lines
13 KiB
C++
#ifndef UTILITY_H
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#define UTILITY_H
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#include <variant>
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#include <vector>
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#include <memory>
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#include <type_traits>
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#include <algorithm>
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#include <optional>
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#include <mutex>
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#include <condition_variable>
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#include <string_view>
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#define KITTY_WHILE_LOOP(x, y, z) { x;while(y) z }
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#define KITTY_DECL_CONSTR(x)\
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x(x&&) noexcept = default;\
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x&operator=(x&&) noexcept = default;\
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x();
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#define KITTY_DEFAULT_CONSTR(x)\
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x(x&&) noexcept = default;\
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x&operator=(x&&) noexcept = default;\
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x() = default;
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#define KITTY_DEFAULT_CONSTR_THROW(x)\
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x(x&&) = default;\
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x&operator=(x&&) = default;\
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x() = default;
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#define TUPLE_2D(a,b, expr)\
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decltype(expr) a##_##b = expr;\
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auto &a = std::get<0>(a##_##b);\
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auto &b = std::get<1>(a##_##b)
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#define TUPLE_2D_REF(a,b, expr)\
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auto &a##_##b = expr;\
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auto &a = std::get<0>(a##_##b);\
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auto &b = std::get<1>(a##_##b)
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#define TUPLE_3D(a,b,c, expr)\
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decltype(expr) a##_##b##_##c = expr;\
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auto &a = std::get<0>(a##_##b##_##c);\
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auto &b = std::get<1>(a##_##b##_##c);\
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auto &c = std::get<2>(a##_##b##_##c)
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#define TUPLE_3D_REF(a,b,c, expr)\
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auto &a##_##b##_##c = expr;\
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auto &a = std::get<0>(a##_##b##_##c);\
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auto &b = std::get<1>(a##_##b##_##c);\
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auto &c = std::get<2>(a##_##b##_##c)
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namespace util {
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template<template<typename...> class X, class...Y>
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struct __instantiation_of : public std::false_type {};
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template<template<typename...> class X, class... Y>
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struct __instantiation_of<X, X<Y...>> : public std::true_type {};
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template<template<typename...> class X, class T, class...Y>
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static constexpr auto instantiation_of_v = __instantiation_of<X, T, Y...>::value;
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template<bool V, class X, class Y>
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struct __either;
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template<class X, class Y>
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struct __either<true, X, Y> {
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using type = X;
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};
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template<class X, class Y>
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struct __either<false, X, Y> {
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using type = Y;
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};
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template<bool V, class X, class Y>
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using either_t = typename __either<V, X, Y>::type;
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template<class T, class V = void>
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struct __false_v;
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template<class T>
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struct __false_v<T, std::enable_if_t<instantiation_of_v<std::optional, T>>> {
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static constexpr std::nullopt_t value = std::nullopt;
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};
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template<class T>
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struct __false_v<T, std::enable_if_t<
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(std::is_pointer_v<T> || instantiation_of_v<std::unique_ptr, T> || instantiation_of_v<std::shared_ptr, T>)
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>> {
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static constexpr std::nullptr_t value = nullptr;
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};
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template<class T>
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struct __false_v<T, std::enable_if_t<std::is_same_v<T, bool>>> {
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static constexpr bool value = false;
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};
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template<class T>
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static constexpr auto false_v = __false_v<T>::value;
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template<class T>
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using optional_t = either_t<
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(std::is_same_v<T, bool> ||
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instantiation_of_v<std::unique_ptr, T> ||
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instantiation_of_v<std::shared_ptr, T> ||
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std::is_pointer_v<T>),
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T, std::optional<T>>;
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template<class T>
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class FailGuard {
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public:
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FailGuard() = delete;
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FailGuard(T && f) noexcept : _func { std::forward<T>(f) } {}
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FailGuard(FailGuard &&other) noexcept : _func { std::move(other._func) } {
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this->failure = other.failure;
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other.failure = false;
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}
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FailGuard(const FailGuard &) = delete;
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FailGuard &operator=(const FailGuard &) = delete;
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FailGuard &operator=(FailGuard &&other) = delete;
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~FailGuard() noexcept {
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if(failure) {
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_func();
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}
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}
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void disable() { failure = false; }
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bool failure { true };
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private:
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T _func;
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};
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template<class T>
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[[nodiscard]] auto fail_guard(T && f) {
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return FailGuard<T> { std::forward<T>(f) };
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}
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template<class T>
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void append_struct(std::vector<uint8_t> &buf, const T &_struct) {
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constexpr size_t data_len = sizeof(_struct);
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buf.reserve(data_len);
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auto *data = (uint8_t *) & _struct;
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for (size_t x = 0; x < data_len; ++x) {
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buf.push_back(data[x]);
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}
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}
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template<class T>
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class Hex {
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public:
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typedef T elem_type;
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private:
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const char _bits[16] {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
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};
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char _hex[sizeof(elem_type) * 2];
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public:
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Hex(const elem_type &elem, bool rev) {
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if(!rev) {
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const uint8_t *data = reinterpret_cast<const uint8_t *>(&elem) + sizeof(elem_type) - 1;
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for (auto it = begin(); it < cend();) {
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*it++ = _bits[*data / 16];
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*it++ = _bits[*data-- % 16];
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}
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}
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else {
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const uint8_t *data = reinterpret_cast<const uint8_t *>(&elem);
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for (auto it = begin(); it < cend();) {
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*it++ = _bits[*data / 16];
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*it++ = _bits[*data++ % 16];
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}
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}
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}
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char *begin() { return _hex; }
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char *end() { return _hex + sizeof(elem_type) * 2; }
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const char *begin() const { return _hex; }
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const char *end() const { return _hex + sizeof(elem_type) * 2; }
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const char *cbegin() const { return _hex; }
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const char *cend() const { return _hex + sizeof(elem_type) * 2; }
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std::string to_string() const {
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return { begin(), end() };
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}
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std::string_view to_string_view() const {
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return { begin(), sizeof(elem_type) * 2 };
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}
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};
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template<class T>
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Hex<T> hex(const T &elem, bool rev = false) {
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return Hex<T>(elem, rev);
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}
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template<class It>
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std::string hex_vec(It begin, It end, bool rev = false) {
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auto str_size = 2*std::distance(begin, end);
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std::string hex;
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hex.resize(str_size);
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const char _bits[16] {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
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};
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if(rev) {
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for (auto it = std::begin(hex); it < std::end(hex);) {
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*it++ = _bits[((uint8_t)*begin) / 16];
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*it++ = _bits[((uint8_t)*begin++) % 16];
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}
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}
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else {
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--end;
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for (auto it = std::begin(hex); it < std::end(hex);) {
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*it++ = _bits[((uint8_t)*end) / 16];
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*it++ = _bits[((uint8_t)*end--) % 16];
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}
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}
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return hex;
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}
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template<class C>
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std::string hex_vec(C&& c, bool rev = false) {
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return hex_vec(std::begin(c), std::end(c), rev);
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}
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template<class T>
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std::optional<T> from_hex(const std::string_view &hex, bool rev = false) {
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std::uint8_t buf[sizeof(T)];
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static char constexpr shift_bit = 'a' - 'A';
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auto is_convertable = [] (char ch) -> bool {
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if(isdigit(ch)) {
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return true;
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}
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ch |= shift_bit;
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if('a' > ch || ch > 'z') {
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return false;
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}
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return true;
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};
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auto buf_size = std::count_if(std::begin(hex), std::end(hex), is_convertable) / 2;
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if(buf_size != sizeof(T)) {
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return std::nullopt;
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}
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const char *data = hex.data() + hex.size() -1;
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auto convert = [] (char ch) -> std::uint8_t {
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if(ch >= '0' && ch <= '9') {
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return (std::uint8_t)ch - '0';
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}
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return (std::uint8_t)(ch | (char)32) - 'a' + (char)10;
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};
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for(auto &el : buf) {
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while(!is_convertable(*data)) { --data; }
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std::uint8_t ch_r = convert(*data--);
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while(!is_convertable(*data)) { --data; }
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std::uint8_t ch_l = convert(*data--);
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el = (ch_l << 4) | ch_r;
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}
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if(rev) {
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std::reverse(std::begin(buf), std::end(buf));
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}
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return *reinterpret_cast<T *>(buf);
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}
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inline std::string from_hex_vec(const std::string &hex, bool rev = false) {
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std::string buf;
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static char constexpr shift_bit = 'a' - 'A';
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auto is_convertable = [] (char ch) -> bool {
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if(isdigit(ch)) {
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return true;
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}
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ch |= shift_bit;
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if('a' > ch || ch > 'z') {
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return false;
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}
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return true;
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};
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auto buf_size = std::count_if(std::begin(hex), std::end(hex), is_convertable) / 2;
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buf.resize(buf_size);
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const char *data = hex.data() + hex.size() -1;
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auto convert = [] (char ch) -> std::uint8_t {
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if(ch >= '0' && ch <= '9') {
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return (std::uint8_t)ch - '0';
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}
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return (std::uint8_t)(ch | (char)32) - 'a' + (char)10;
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};
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for(auto &el : buf) {
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while(!is_convertable(*data)) { --data; }
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std::uint8_t ch_r = convert(*data--);
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while(!is_convertable(*data)) { --data; }
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std::uint8_t ch_l = convert(*data--);
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el = (ch_l << 4) | ch_r;
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}
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if(rev) {
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std::reverse(std::begin(buf), std::end(buf));
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}
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return buf;
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}
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template<class T>
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class hash {
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public:
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using value_type = T;
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std::size_t operator()(const value_type &value) const {
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const auto *p = reinterpret_cast<const char *>(&value);
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return std::hash<std::string_view>{}(std::string_view { p, sizeof(value_type) });
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}
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};
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template<class T>
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auto enm(const T& val) -> const std::underlying_type_t<T>& {
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return *reinterpret_cast<const std::underlying_type_t<T>*>(&val);
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}
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template<class T>
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auto enm(T& val) -> std::underlying_type_t<T>& {
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return *reinterpret_cast<std::underlying_type_t<T>*>(&val);
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}
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template<class ReturnType, class ...Args>
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struct Function {
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typedef ReturnType (*type)(Args...);
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};
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template<class T, class ReturnType, typename Function<ReturnType, T>::type function>
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struct Destroy {
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typedef T pointer;
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void operator()(pointer p) {
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function(p);
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}
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};
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template<class T, typename Function<void, T*>::type function>
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using safe_ptr = std::unique_ptr<T, Destroy<T*, void, function>>;
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// You cannot specialize an alias
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template<class T, class ReturnType, typename Function<ReturnType, T*>::type function>
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using safe_ptr_v2 = std::unique_ptr<T, Destroy<T*, ReturnType, function>>;
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template<class T>
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void c_free(T *p) {
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free(p);
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}
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template<class T>
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using c_ptr = safe_ptr<T, c_free<T>>;
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inline std::int64_t from_chars(const char *begin, const char *end) {
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std::int64_t res {};
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std::int64_t mul = 1;
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while(begin != --end) {
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res += (std::int64_t)(*end - '0') * mul;
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mul *= 10;
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}
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return *begin != '-' ? res + (std::int64_t)(*begin - '0') * mul : -res;
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}
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inline std::int64_t from_view(const std::string_view &number) {
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return from_chars(std::begin(number), std::end(number));
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}
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template<class X, class Y>
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class Either : public std::variant<X, Y> {
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public:
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using std::variant<X, Y>::variant;
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constexpr bool has_left() const {
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return std::holds_alternative<X>(*this);
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}
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constexpr bool has_right() const {
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return std::holds_alternative<Y>(*this);
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}
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X &left() {
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return std::get<X>(*this);
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}
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Y &right() {
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return std::get<Y>(*this);
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}
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const X &left() const {
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return std::get<X>(*this);
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}
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const Y &right() const {
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return std::get<Y>(*this);
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}
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};
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template<class T>
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class buffer_t {
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public:
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buffer_t() : _els { 0 } {};
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buffer_t(buffer_t&&) noexcept = default;
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buffer_t &operator=(buffer_t&& other) noexcept {
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std::swap(_els, other._els);
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_buf = std::move(other._buf);
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return *this;
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};
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explicit buffer_t(size_t elements) : _els { elements }, _buf { std::make_unique<T[]>(elements) } {}
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explicit buffer_t(size_t elements, const T &t) : _els { elements }, _buf { std::make_unique<T[]>(elements) } {
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std::fill_n(_buf.get(), elements, t);
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}
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T &operator[](size_t el) {
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return _buf[el];
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}
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const T &operator[](size_t el) const {
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return _buf[el];
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}
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size_t size() const {
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return _els;
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}
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void fake_resize(std::size_t els) {
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_els = els;
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}
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T *begin() {
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return _buf.get();
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}
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const T *begin() const {
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return _buf.get();
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}
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T *end() {
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return _buf.get() + _els;
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}
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const T *end() const {
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return _buf.get() + _els;
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}
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private:
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size_t _els;
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std::unique_ptr<T[]> _buf;
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};
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template<class T>
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T either(std::optional<T> &&l, T &&r) {
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if(l) {
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return std::move(*l);
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}
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return std::forward<T>(r);
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}
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namespace endian {
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template<class T = void>
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struct endianness {
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enum : bool {
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#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || \
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defined(__BIG_ENDIAN__) || \
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defined(__ARMEB__) || \
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defined(__THUMBEB__) || \
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defined(__AARCH64EB__) || \
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defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
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// It's a big-endian target architecture
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little = false,
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#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN || \
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defined(__LITTLE_ENDIAN__) || \
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defined(__ARMEL__) || \
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defined(__THUMBEL__) || \
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defined(__AARCH64EL__) || \
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defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) || \
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defined(_WIN32)
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// It's a little-endian target architecture
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little = true,
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#else
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#error "Unknown Endianness"
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#endif
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big = !little
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};
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};
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template<class T, class S = void>
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struct endian_helper { };
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template<class T>
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struct endian_helper<T, std::enable_if_t<
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!(instantiation_of_v<std::optional, T>)
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>> {
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static inline T big(T x) {
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if constexpr (endianness<T>::little) {
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uint8_t *data = reinterpret_cast<uint8_t*>(&x);
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|
|
|
std::reverse(data, data + sizeof(x));
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
static inline T little(T x) {
|
|
if constexpr (endianness<T>::big) {
|
|
uint8_t *data = reinterpret_cast<uint8_t*>(&x);
|
|
|
|
std::reverse(data, data + sizeof(x));
|
|
}
|
|
|
|
return x;
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
struct endian_helper<T, std::enable_if_t<
|
|
instantiation_of_v<std::optional, T>
|
|
>> {
|
|
static inline T little(T x) {
|
|
if(!x) return x;
|
|
|
|
if constexpr (endianness<T>::big) {
|
|
auto *data = reinterpret_cast<uint8_t*>(&*x);
|
|
|
|
std::reverse(data, data + sizeof(*x));
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
|
|
static inline T big(T x) {
|
|
if(!x) return x;
|
|
|
|
if constexpr (endianness<T>::big) {
|
|
auto *data = reinterpret_cast<uint8_t*>(&*x);
|
|
|
|
std::reverse(data, data + sizeof(*x));
|
|
}
|
|
|
|
return x;
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
inline auto little(T x) { return endian_helper<T>::little(x); }
|
|
|
|
template<class T>
|
|
inline auto big(T x) { return endian_helper<T>::big(x); }
|
|
} /* endian */
|
|
|
|
} /* util */
|
|
#endif
|