math.cpp

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Alex Alex Commit Client Upload Part 2 19/10/2026 00:06
1/*
2 * Copyright (c) 2010-2017 OTClient <https://github.com/edubart/otclient>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23#include "math.h"
24#include <random>
25
26#ifdef _MSC_VER
27 #pragma warning(disable:4267) // '?' : conversion from 'A' to 'B', possible loss of data
28#endif
29
30namespace stdext {
31
32uint32_t adler32(const uint8_t *buffer, size_t size) {
33 size_t a = 1, b = 0, tlen;
34 while(size > 0) {
35 tlen = size > 5552 ? 5552 : size;
36 size -= tlen;
37 do {
38 a += *buffer++;
39 b += a;
40 } while (--tlen);
41
42 a %= 65521;
43 b %= 65521;
44 }
45 return (b << 16) | a;
46}
47
48long random_range(long min, long max)
49{
50 static std::random_device rd;
51 static std::mt19937 gen(rd());
52 static std::uniform_int_distribution<long> dis(0, 2147483647);
53 return min + (dis(gen) % (max - min + 1));
54}
55
56float random_range(float min, float max)
57{
58 static std::random_device rd;
59 static std::mt19937 gen(rd());
60 static std::uniform_real_distribution<float> dis(0.0, 1.0);
61 return min + (max - min)*dis(gen);
62}
63
64double round(double r)
65{
66 return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
67}
68
69}
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