Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/tree.c @ 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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 // Copyright (C) 2004-2021 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 #include "mupdf/fitz.h"
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24
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25 #include <string.h>
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27 /* AA-tree */
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29 struct fz_tree
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30 {
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31 char *key;
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32 void *value;
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33 fz_tree *left, *right;
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34 int level;
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35 };
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36
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37 static fz_tree tree_sentinel = { "", NULL, &tree_sentinel, &tree_sentinel, 0 };
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38
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39 static fz_tree *fz_tree_new_node(fz_context *ctx, const char *key, void *value)
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40 {
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41 fz_tree *node = fz_malloc_struct(ctx, fz_tree);
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42 fz_try(ctx)
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43 {
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44 node->key = fz_strdup(ctx, key);
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45 node->value = value;
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46 node->left = node->right = &tree_sentinel;
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47 node->level = 1;
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48 }
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49 fz_catch(ctx)
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50 {
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51 fz_free(ctx, node);
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52 fz_rethrow(ctx);
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53 }
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54 return node;
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55 }
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56
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57 void *fz_tree_lookup(fz_context *ctx, fz_tree *node, const char *key)
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58 {
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59 if (node)
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60 {
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61 while (node != &tree_sentinel)
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62 {
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63 int c = strcmp(key, node->key);
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64 if (c == 0)
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65 return node->value;
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66 else if (c < 0)
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67 node = node->left;
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68 else
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69 node = node->right;
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70 }
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71 }
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72 return NULL;
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73 }
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74
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75 static fz_tree *fz_tree_skew(fz_tree *node)
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76 {
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77 if (node->level != 0)
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78 {
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79 if (node->left->level == node->level)
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80 {
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81 fz_tree *save = node;
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82 node = node->left;
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83 save->left = node->right;
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84 node->right = save;
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85 }
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86 node->right = fz_tree_skew(node->right);
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87 }
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88 return node;
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89 }
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90
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91 static fz_tree *fz_tree_split(fz_tree *node)
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92 {
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93 if (node->level != 0 && node->right->right->level == node->level)
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94 {
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95 fz_tree *save = node;
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96 node = node->right;
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97 save->right = node->left;
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98 node->left = save;
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99 node->level++;
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100 node->right = fz_tree_split(node->right);
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101 }
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102 return node;
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103 }
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104
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105 fz_tree *fz_tree_insert(fz_context *ctx, fz_tree *node, const char *key, void *value)
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106 {
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107 if (node && node != &tree_sentinel)
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108 {
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109 int c = strcmp(key, node->key);
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110 if (c < 0)
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111 node->left = fz_tree_insert(ctx, node->left, key, value);
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112 else
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113 node->right = fz_tree_insert(ctx, node->right, key, value);
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114 node = fz_tree_skew(node);
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115 node = fz_tree_split(node);
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116 return node;
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117 }
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118 else
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119 {
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120 return fz_tree_new_node(ctx, key, value);
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121 }
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122 }
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123
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124 void fz_drop_tree(fz_context *ctx, fz_tree *node, void (*dropfunc)(fz_context *ctx, void *value))
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125 {
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126 if (node)
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127 {
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128 if (node->left != &tree_sentinel)
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129 fz_drop_tree(ctx, node->left, dropfunc);
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130 if (node->right != &tree_sentinel)
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131 fz_drop_tree(ctx, node->right, dropfunc);
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132 fz_free(ctx, node->key);
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133 if (dropfunc)
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134 dropfunc(ctx, node->value);
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135 fz_free(ctx, node);
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136 }
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137 }