Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/hashmap.h @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 #ifndef LEPTONICA_HASHMAP_H
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28 #define LEPTONICA_HASHMAP_H
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29
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30 /*
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31 * \file hashmap.h
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32 *
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33 * <pre>
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34 * Contains the following structs:
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35 * struct L_Hashmap
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36 * struct L_Hashitem
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37 *
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38 * Goal:
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39 * You have a set of objects (integers, strings, pts, whatever),
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40 * and you want to store them in a data structure (L_Hashmap) that allows
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41 * O(1) to find, insert and count the occurrences of such an object.
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42 * The tool is a hash map. This is not ordered, unlike the O(log n)
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43 * ordered map (L_Amap), which is implemented by an rbtree.
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44 *
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45 * In slightly more detail:
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46 * Store the set of objects in an array, which in general can be
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47 * held in a pointer array (L_Ptra). You need a hash function that
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48 * will generate a unique uint64 key from each object. For our simple
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49 * built-in arrays, such as float, double and Pta (points), these hash
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50 * functions are in utils1.c. Then for each object in the array,
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51 * you store the key and the index to the array of objects (the val)
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52 * in a list of hashitems in the hash table, where the specific
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53 * list is determined by the key (specifically, the mod of the key
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54 * with the size of the hashtable).
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55 *
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56 * In yet more detail:
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57 * (1) The design loosely follows the design of a hashmap in "The Practice
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58 * of Programming by Brian Kernighan and Rob Pike, Addison Wesley, 1999.
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59 * (2) The L_Hashmap contains a hashtable with a prime number of pointers
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60 * to lists of hashitems. The lookup function takes a key and a value,
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61 * which are both 64-bit unsigned integers. The key has been generated
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62 * by hashing the input object in a way that avoids collisions between
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63 * different objects. The value is an integer that identifies the
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64 * object; typically it is the index into an array of objects.
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65 * The hashtable size is a prime number, and an index into the table
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66 * is made from the key by taking its mod with the hashtable size.
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67 * The index points to a list of hashitems, which have all been hashed
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68 * by the mod function into the same index in the table.
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69 * Because the key is expected to be randomly distributed in uint64,
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70 * the table indices should be uniformly distributed, resulting in
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71 * approximately the same number of items being placed in each of
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72 * these lists. The list of hashitems is traversed, comparing the
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73 * input uint64 key in the lookup() function with the key stored in
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74 * each hashitem. If a hashitem is found with a matching key,
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75 * return a pointer to that hashitem. If not found and the op is
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76 * L_HASH_CREATE, make a new hash item, add it to the list, and
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77 * return a pointer to it.
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78 * (3) The count field in the hashitem gives the number of times the
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79 * key has been seen when storing key/value pairs.
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80 * (4) The val field is the index into an array of the objects. When
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81 * the hashmap is initially made, it is the index of the first item
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82 * seen with its key.
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83 * (5) For the hashmap to work efficiently, the lists must not become too
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84 * long. Because in general you do not know the number of objects
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85 * in advance, it is important to be able to dynamically resize
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86 * the hashtable as it grows. The hashmap is initialized with
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87 * room for some number of hashitems and the maximum average list
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88 * size. These two numbers determine the size of the hashtable,
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89 * which is constrained to be a prime number. As the hashtable grows,
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90 * if the average occupancy exceeds the input %maxocc, the hashtable
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91 * size is approximately doubled and the existing items are re-hashed
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92 * into it, mod the new (prime number) table size.
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93 * </pre>
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94 */
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95
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96 /*------------------------------------------------------------------------*
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97 * Hash map structs *
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98 *------------------------------------------------------------------------*/
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99 /*! General hash map */
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100 struct L_Hashmap
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101 {
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102 l_int32 nitems; /*!< number of stored items */
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103 l_int32 ntogo; /*!< number of items to be stored */
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104 /*!< before resizing the hashmap */
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105 l_int32 maxocc; /*!< max average occupancy allowed */
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106 struct L_Hashitem **hashtab; /*!< array of hash item ptrs */
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107 l_int32 tabsize; /*!< size of array of hash item ptrs */
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108 };
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109 typedef struct L_Hashmap L_HASHMAP;
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110
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111 /*! Hash item, containing storage for the key, value and count. The key
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112 is a l_uint64, which is hashed by the mod function to find the index
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113 into the hashtab. */
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114 struct L_Hashitem
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115 {
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116 l_uint64 key; /*!< key is hashed into index into hashtab */
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117 l_uint64 val; /*!< number stored associated with the key */
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118 l_int32 count; /*!< number of elements seen with this key */
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119 struct L_Hashitem *next; /*!< ptr to the next in the list */
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120 };
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121 typedef struct L_Hashitem L_HASHITEM;
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122
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123
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124 /*------------------------------------------------------------------------*
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125 * Hashmap flags *
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126 *------------------------------------------------------------------------*/
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127 /*! Hashmap Lookup */
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128 enum {
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129 L_UNDEFINED = 0, /*!< invalid operation */
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130 L_HMAP_CHECK = 1, /*!< check if this key/val has been stored */
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131 L_HMAP_CREATE = 2 /*!< create and store a hashitem if not found */
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132 };
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133
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134 #endif /* LEPTONICA_HASHMAP_H */