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https://github.com/libretro/beetle-psx-libretro.git
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106 lines
2.2 KiB
C++
106 lines
2.2 KiB
C++
/* Copyright (c) 2017-2018 Hans-Kristian Arntzen
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <stdint.h>
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#include <string>
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namespace Util
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{
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using Hash = uint64_t;
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class Hasher
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{
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public:
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Hasher(Hash h)
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: h(h)
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{
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}
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Hasher() = default;
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template <typename T>
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inline void data(const T *data, size_t size)
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{
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size /= sizeof(*data);
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for (size_t i = 0; i < size; i++)
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h = (h * 0x100000001b3ull) ^ data[i];
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}
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inline void u32(uint32_t value)
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{
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h = (h * 0x100000001b3ull) ^ value;
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}
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inline void s32(int32_t value)
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{
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u32(uint32_t(value));
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}
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inline void f32(float value)
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{
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union
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{
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float f32;
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uint32_t u32;
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} u;
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u.f32 = value;
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u32(u.u32);
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}
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inline void u64(uint64_t value)
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{
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u32(value & 0xffffffffu);
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u32(value >> 32);
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}
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template <typename T>
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inline void pointer(T *ptr)
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{
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u64(reinterpret_cast<uintptr_t>(ptr));
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}
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inline void string(const char *str)
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{
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char c;
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u32(0xff);
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while ((c = *str++) != '\0')
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u32(uint8_t(c));
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}
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inline void string(const std::string &str)
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{
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u32(0xff);
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for (auto &c : str)
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u32(uint8_t(c));
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}
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inline Hash get() const
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{
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return h;
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}
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private:
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Hash h = 0xcbf29ce484222325ull;
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};
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}
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