src/hash_key.c

Sat, 03 Sep 2022 15:11:23 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 03 Sep 2022 15:11:23 +0200
changeset 582
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parent 563
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child 603
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permissions
-rw-r--r--

implement strupper and strlower

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cx/hash_key.h"
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30 #include <string.h>
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31
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32 void cx_hash_murmur(CxHashKey *key) {
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33 size_t len = key->len;
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34 unsigned char const *data = key->data.cbytes;
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35
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36 unsigned m = 0x5bd1e995;
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37 unsigned r = 24;
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38 unsigned h = 25 ^ len;
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39 unsigned i = 0;
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40 while (len >= 4) {
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41 unsigned k = data[i + 0] & 0xFF;
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42 k |= (data[i + 1] & 0xFF) << 8;
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43 k |= (data[i + 2] & 0xFF) << 16;
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44 k |= (data[i + 3] & 0xFF) << 24;
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45
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46 k *= m;
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47 k ^= k >> r;
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48 k *= m;
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49
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50 h *= m;
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51 h ^= k;
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52
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53 i += 4;
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54 len -= 4;
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55 }
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56
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57 switch (len) {
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58 case 3:
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59 h ^= (data[i + 2] & 0xFF) << 16;
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60 __attribute__((__fallthrough__));
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61 case 2:
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62 h ^= (data[i + 1] & 0xFF) << 8;
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63 __attribute__((__fallthrough__));
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64 case 1:
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65 h ^= (data[i + 0] & 0xFF);
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66 h *= m;
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67 __attribute__((__fallthrough__));
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68 default:
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69 /* do nothing */;
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70 }
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71
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72 h ^= h >> 13;
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73 h *= m;
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74 h ^= h >> 15;
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75
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76 key->hash = h;
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77 }
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78
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79 CxHashKey cx_hash_key_str(char const *str) {
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80 CxHashKey key;
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81 key.data.cstr = str;
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82 key.len = str == NULL ? 0 : (1 + strlen(str));
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83 cx_hash_murmur(&key);
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84 return key;
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85 }
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86
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87 CxHashKey cx_hash_key_bytes(
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88 unsigned char const *bytes,
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89 size_t len
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90 ) {
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91 CxHashKey key;
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92 key.data.cbytes = bytes;
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93 key.len = len;
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94 cx_hash_murmur(&key);
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95 return key;
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96 }
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97
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98 CxHashKey cx_hash_key(
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99 void *obj,
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100 size_t len
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101 ) {
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102 CxHashKey key;
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103 key.data.obj = obj;
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104 key.len = len;
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105 cx_hash_murmur(&key);
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106 return key;
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107 }

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