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90 lines
3.0 KiB
90 lines
3.0 KiB
/*
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* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef STDEXT_MATH_H
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#define STDEXT_MATH_H
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#include "types.h"
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#include <random>
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namespace stdext {
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inline uint32 generate_adler_checksum(uint8 *buffer, uint16 size) {
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register uint32 a = 1, b = 0, tlen;
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while(size > 0) {
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tlen = size > 5552 ? 5552 : size;
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size -= tlen;
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do {
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a += *buffer++;
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b += a;
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} while (--tlen);
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a %= 65521;
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b %= 65521;
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}
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return (b << 16) | a;
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}
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inline bool is_power_of_two(uint32 v) {
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return ((v != 0) && !(v & (v - 1)));
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}
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inline uint32 to_power_of_two(uint32 v) {
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if(v == 0)
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return 0;
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uint32 r = 1;
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while(r < v && r != 0xffffffff)
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r <<= 1;
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return r;
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}
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inline uint16 readLE16(uchar *addr) { return (uint16)addr[1] << 8 | addr[0]; }
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inline uint32 readLE32(uchar *addr) { return (uint32)readLE16(addr + 2) << 16 | readLE16(addr); }
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inline uint64 readLE64(uchar *addr) { return (uint64)readLE32(addr + 4) << 32 | readLE32(addr); }
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inline void writeLE16(uchar *addr, uint16 value) { addr[1] = value >> 8; addr[0] = (uint8)value; }
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inline void writeLE32(uchar *addr, uint32 value) { writeLE16(addr + 2, value >> 16); writeLE16(addr, (uint16)value); }
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inline void writeLE64(uchar *addr, uint64 value) { writeLE16(addr + 4, value >> 32); writeLE32(addr, (uint32)value); }
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template<typename T>
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T random_range(T min, T max);
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template<>
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inline int random_range<int>(int min, int max) {
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static std::random_device rd;
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static std::mt19937 gen(rd());
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static std::uniform_int_distribution<int> dis(0, 2147483647);
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return min + (dis(gen) % (max - min + 1));
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}
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template<>
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inline float random_range<float>(float min, float max) {
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static std::random_device rd;
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static std::mt19937 gen(rd());
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static std::uniform_real_distribution<float> dis(0.0, 1.0);
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return min + (max - min)*dis(gen);
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}
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}
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#endif
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