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ImHex/plugins/libimhex/include/helpers/utils.hpp
2021-01-02 20:49:55 +01:00

183 lines
4.9 KiB
C++

#pragma once
#include <hex.hpp>
#include <array>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#ifdef __MINGW32__
#include <winsock.h>
#else
#include <arpa/inet.h>
#endif
#ifdef __APPLE__
#define off64_t off_t
#define fopen64 fopen
#define fseeko64 fseek
#define ftello64 ftell
#endif
#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION <= 12000
#if __has_include(<concepts>)
// Make sure we break when derived_from is implemented in libc++. Then we can fix a compatibility version above
#include <concepts>
#endif
// libcxx 12 still doesn't have many default concepts implemented, as a result we need to define it ourself using clang built-ins.
// [concept.derived] (patch from https://reviews.llvm.org/D74292)
namespace hex {
template<class _Dp, class _Bp>
concept derived_from =
__is_base_of(_Bp, _Dp) && __is_convertible_to(const volatile _Dp*, const volatile _Bp*);
}
// [concepts.arithmetic]
namespace hex {
template<class _Tp>
concept integral = __is_integral(_Tp);
template<class _Tp>
concept signed_integral = integral<_Tp> && __is_signed(_Tp);
template<class _Tp>
concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>;
template<class _Tp>
concept floating_point = __is_floating_point(_Tp);
}
#else
// Assume supported
#include <concepts>
namespace hex {
using std::derived_from;
using std::integral;
using std::signed_integral;
using std::unsigned_integral;
using std::floating_point;
}
#endif
#define TOKEN_CONCAT_IMPL(x, y) x ## y
#define TOKEN_CONCAT(x, y) TOKEN_CONCAT_IMPL(x, y)
template<>
struct std::is_integral<u128> : public std::true_type { };
template<>
struct std::is_integral<s128> : public std::true_type { };
template<>
struct std::is_signed<s128> : public std::true_type { };
namespace hex {
template<typename ... Args>
inline std::string format(const char *format, Args ... args) {
ssize_t size = snprintf( nullptr, 0, format, args ... );
if (size <= 0)
return "";
std::vector<char> buffer(size + 1, 0x00);
snprintf(buffer.data(), size + 1, format, args ...);
return std::string(buffer.data(), buffer.data() + size);
}
[[nodiscard]] constexpr inline u64 extract(u8 from, u8 to, const hex::unsigned_integral auto &value) {
std::remove_cvref_t<decltype(value)> mask = (std::numeric_limits<std::remove_cvref_t<decltype(value)>>::max() >> (((sizeof(value) * 8) - 1) - (from - to))) << to;
return (value & mask) >> to;
}
template<std::integral T>
[[nodiscard]] constexpr inline T signExtend(T value, u8 currWidth, u8 targetWidth) {
T mask = 1LLU << (currWidth - 1);
return (((value ^ mask) - mask) << ((sizeof(T) * 8) - targetWidth)) >> ((sizeof(T) * 8) - targetWidth);
}
std::string toByteString(u64 bytes);
std::string makePrintable(char c);
template<typename T>
struct always_false : std::false_type {};
template<typename T>
constexpr T changeEndianess(T value, std::endian endian) {
if (endian == std::endian::native)
return value;
if constexpr (sizeof(T) == 1)
return value;
else if constexpr (sizeof(T) == 2)
return __builtin_bswap16(value);
else if constexpr (sizeof(T) == 4)
return __builtin_bswap32(value);
else if constexpr (sizeof(T) == 8)
return __builtin_bswap64(value);
else
static_assert(always_false<T>::value, "Invalid type provided!");
}
template<typename T>
constexpr T changeEndianess(T value, size_t size, std::endian endian) {
if (endian == std::endian::native)
return value;
if (size == 1)
return value;
else if (size == 2)
return __builtin_bswap16(value);
else if (size == 4)
return __builtin_bswap32(value);
else if (size == 8)
return __builtin_bswap64(value);
else
throw std::invalid_argument("Invalid value size!");
}
template< class T >
constexpr T bit_width(T x) noexcept {
return std::numeric_limits<T>::digits - std::countl_zero(x);
}
template<typename T>
constexpr T bit_ceil(T x) noexcept {
if (x <= 1u)
return T(1);
return T(1) << bit_width(T(x - 1));
}
std::vector<u8> readFile(std::string_view path);
#define SCOPE_EXIT(func) ScopeExit TOKEN_CONCAT(scopeGuard, __COUNTER__)([&] { func })
class ScopeExit {
public:
ScopeExit(std::function<void()> func) : m_func(func) {}
~ScopeExit() { if (this->m_func != nullptr) this->m_func(); }
void release() {
this->m_func = nullptr;
}
private:
std::function<void()> m_func;
};
struct Region {
u64 address;
size_t size;
};
struct Bookmark {
Region region;
std::vector<char> name;
std::vector<char> comment;
};
}