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xorstr.h
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/*
* Copyright 2017 - 2020 Justas Masiulis
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef JM_XORSTR_HPP
#define JM_XORSTR_HPP
#include <immintrin.h>
#include <cstdint>
#include <cstddef>
#include <utility>
#include <type_traits>
#define xorstr_(str) ::jm::xor_string([]() { return str; }, std::integral_constant<std::size_t, sizeof(str) / sizeof(*str)>{}, std::make_index_sequence<::jm::detail::_buffer_size<sizeof(str)>()>{})
#define xorstr(str) xorstr_(str).crypt_get()
#ifdef _MSC_VER
#define XORSTR_FORCEINLINE __forceinline
#else
#define XORSTR_FORCEINLINE __attribute__((always_inline)) inline
#endif
#if defined(__clang__) || defined(__GNUC__)
#define JM_XORSTR_LOAD_FROM_REG(x) ::jm::detail::load_from_reg(x)
#else
#define JM_XORSTR_LOAD_FROM_REG(x) (x)
#endif
namespace jm {
namespace detail {
template<std::size_t Size>
XORSTR_FORCEINLINE constexpr std::size_t _buffer_size()
{
return ((Size / 16) + (Size % 16 != 0)) * 2;
}
template<std::uint32_t Seed>
XORSTR_FORCEINLINE constexpr std::uint32_t key4() noexcept
{
std::uint32_t value = Seed;
for(char c : __TIME__)
value = static_cast<std::uint32_t>((value ^ c) * 16777619ull);
return value;
}
template<std::size_t S>
XORSTR_FORCEINLINE constexpr std::uint64_t key8()
{
constexpr auto first_part = key4<2166136261 + S>();
constexpr auto second_part = key4<first_part>();
return (static_cast<std::uint64_t>(first_part) << 32) | second_part;
}
// loads up to 8 characters of string into uint64 and xors it with the key
template<std::size_t N, class CharT>
XORSTR_FORCEINLINE constexpr std::uint64_t
load_xored_str8(std::uint64_t key, std::size_t idx, const CharT* str) noexcept
{
using cast_type = typename std::make_unsigned<CharT>::type;
constexpr auto value_size = sizeof(CharT);
constexpr auto idx_offset = 8 / value_size;
std::uint64_t value = key;
for(std::size_t i = 0; i < idx_offset && i + idx * idx_offset < N; ++i)
value ^=
(std::uint64_t{ static_cast<cast_type>(str[i + idx * idx_offset]) }
<< ((i % idx_offset) * 8 * value_size));
return value;
}
// forces compiler to use registers instead of stuffing constants in rdata
XORSTR_FORCEINLINE std::uint64_t load_from_reg(std::uint64_t value) noexcept
{
#if defined(__clang__) || defined(__GNUC__)
asm("" : "=r"(value) : "0"(value) :);
#endif
return value;
}
template<std::uint64_t V>
struct uint64_v {
constexpr static std::uint64_t value = V;
};
} // namespace detail
template<class CharT, std::size_t Size, class Keys, class Indices>
class xor_string;
template<class CharT, std::size_t Size, std::uint64_t... Keys, std::size_t... Indices>
class xor_string<CharT, Size, std::integer_sequence<std::uint64_t, Keys...>, std::index_sequence<Indices...>> {
#ifndef JM_XORSTR_DISABLE_AVX_INTRINSICS
constexpr static inline std::uint64_t alignment = ((Size > 16) ? 32 : 16);
#else
constexpr static inline std::uint64_t alignment = 16;
#endif
alignas(alignment) std::uint64_t _storage[sizeof...(Keys)];
public:
using value_type = CharT;
using size_type = std::size_t;
using pointer = CharT*;
using const_pointer = const CharT*;
template<class L>
XORSTR_FORCEINLINE xor_string(L l, std::integral_constant<std::size_t, Size>, std::index_sequence<Indices...>) noexcept
: _storage{ JM_XORSTR_LOAD_FROM_REG(detail::uint64_v<detail::load_xored_str8<Size>(Keys, Indices, l())>::value)... }
{}
XORSTR_FORCEINLINE constexpr size_type size() const noexcept
{
return Size - 1;
}
XORSTR_FORCEINLINE void crypt() noexcept
{
#if defined(__clang__)
alignas(alignment)
std::uint64_t arr[]{ JM_XORSTR_LOAD_FROM_REG(Keys)... };
std::uint64_t* keys =
(std::uint64_t*)JM_XORSTR_LOAD_FROM_REG((std::uint64_t)arr);
#else
alignas(alignment) std::uint64_t keys[]{ JM_XORSTR_LOAD_FROM_REG(Keys)... };
#endif
#ifndef JM_XORSTR_DISABLE_AVX_INTRINSICS
((Indices >= sizeof(_storage) / 32 ? static_cast<void>(0) : _mm256_store_si256(
reinterpret_cast<__m256i*>(_storage) + Indices,
_mm256_xor_si256(
_mm256_load_si256(reinterpret_cast<const __m256i*>(_storage) + Indices),
_mm256_load_si256(reinterpret_cast<const __m256i*>(keys) + Indices)))), ...);
if constexpr(sizeof(_storage) % 32 != 0)
_mm_store_si128(
reinterpret_cast<__m128i*>(_storage + sizeof...(Keys) - 2),
_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage + sizeof...(Keys) - 2)),
_mm_load_si128(reinterpret_cast<const __m128i*>(keys + sizeof...(Keys) - 2))));
#else
((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : _mm_store_si128(
reinterpret_cast<__m128i*>(_storage) + Indices,
_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage) + Indices),
_mm_load_si128(reinterpret_cast<const __m128i*>(keys) + Indices)))), ...);
#endif
}
XORSTR_FORCEINLINE const_pointer get() const noexcept
{
return reinterpret_cast<const_pointer>(_storage);
}
XORSTR_FORCEINLINE pointer get() noexcept
{
return reinterpret_cast<pointer>(_storage);
}
XORSTR_FORCEINLINE pointer crypt_get() noexcept
{
// crypt() function inlined by hand, because MSVC linker chokes when you have a lot of strings
// on 32 bit builds, so don't blame me for shit code :pepekms:
#if defined(__clang__)
alignas(alignment)
std::uint64_t arr[]{ JM_XORSTR_LOAD_FROM_REG(Keys)... };
std::uint64_t* keys =
(std::uint64_t*)JM_XORSTR_LOAD_FROM_REG((std::uint64_t)arr);
#else
alignas(alignment) std::uint64_t keys[]{ JM_XORSTR_LOAD_FROM_REG(Keys)... };
#endif
#ifndef JM_XORSTR_DISABLE_AVX_INTRINSICS
((Indices >= sizeof(_storage) / 32 ? static_cast<void>(0) : _mm256_store_si256(
reinterpret_cast<__m256i*>(_storage) + Indices,
_mm256_xor_si256(
_mm256_load_si256(reinterpret_cast<const __m256i*>(_storage) + Indices),
_mm256_load_si256(reinterpret_cast<const __m256i*>(keys) + Indices)))), ...);
if constexpr(sizeof(_storage) % 32 != 0)
_mm_store_si128(
reinterpret_cast<__m128i*>(_storage + sizeof...(Keys) - 2),
_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage + sizeof...(Keys) - 2)),
_mm_load_si128(reinterpret_cast<const __m128i*>(keys + sizeof...(Keys) - 2))));
#else
((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : _mm_store_si128(
reinterpret_cast<__m128i*>(_storage) + Indices,
_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage) + Indices),
_mm_load_si128(reinterpret_cast<const __m128i*>(keys) + Indices)))), ...);
#endif
return (pointer)(_storage);
}
};
template<class L, std::size_t Size, std::size_t... Indices>
xor_string(L l, std::integral_constant<std::size_t, Size>, std::index_sequence<Indices...>) -> xor_string<
std::remove_const_t<std::remove_reference_t<decltype(l()[0])>>,
Size,
std::integer_sequence<std::uint64_t, detail::key8<Indices>()...>,
std::index_sequence<Indices...>>;
} // namespace jm
#endif // include guard