Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/rbtree.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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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 /*
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28 * Modified from the excellent code here:
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29 * http://en.literateprograms.org/Red-black_tree_(C)?oldid=19567
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30 * which has been placed in the public domain under the Creative Commons
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31 * CC0 1.0 waiver (http://creativecommons.org/publicdomain/zero/1.0/).
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32 *
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33 * When the key is generated from a hash (e.g., string --> uint64),
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34 * there is always the possibility of having collisions, but to make
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35 * the collision probability very low requires using a large hash.
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36 * For that reason, the key types are 64 bit quantities, which will result
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37 * in a negligible probabililty of collisions for millions of hashed values.
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38 * Using 8 byte keys instead of 4 byte keys requires a little more
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39 * storage, but the simplification in being able to ignore collisions
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40 * with the red-black trees for most applications is worth it.
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41 */
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42
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43 #ifndef LEPTONICA_RBTREE_H
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44 #define LEPTONICA_RBTREE_H
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45
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46 /*! The three valid key types for red-black trees, maps and sets. */
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47 /*! RBTree Key Type */
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48 enum {
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49 L_INT_TYPE = 1,
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50 L_UINT_TYPE = 2,
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51 L_FLOAT_TYPE = 3
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52 };
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53
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54 /*!
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55 * Storage for keys and values for red-black trees, maps and sets.
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56 * <pre>
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57 * Note:
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58 * (1) Keys and values of the valid key types are all 64-bit
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59 * (2) (void *) can be used for values but not for keys.
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60 * </pre>
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61 */
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62 union Rb_Type {
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63 l_int64 itype;
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64 l_uint64 utype;
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65 l_float64 ftype;
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66 void *ptype;
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67 };
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68 typedef union Rb_Type RB_TYPE;
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69
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70 struct L_Rbtree {
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71 struct L_Rbtree_Node *root;
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72 l_int32 keytype;
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73 };
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74 typedef struct L_Rbtree L_RBTREE;
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75 typedef struct L_Rbtree L_AMAP; /* hide underlying implementation for map */
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76 typedef struct L_Rbtree L_ASET; /* hide underlying implementation for set */
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77
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78 struct L_Rbtree_Node {
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79 union Rb_Type key;
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80 union Rb_Type value;
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81 struct L_Rbtree_Node *left;
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82 struct L_Rbtree_Node *right;
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83 struct L_Rbtree_Node *parent;
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84 l_int32 color;
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85 };
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86 typedef struct L_Rbtree_Node L_RBTREE_NODE;
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87 typedef struct L_Rbtree_Node L_AMAP_NODE; /* hide tree implementation */
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88 typedef struct L_Rbtree_Node L_ASET_NODE; /* hide tree implementation */
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89
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90
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91 #endif /* LEPTONICA_RBTREE_H */