Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/hash.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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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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23 #ifndef MUPDF_FITZ_HASH_H
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24 #define MUPDF_FITZ_HASH_H
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26 #include "mupdf/fitz/system.h"
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27 #include "mupdf/fitz/context.h"
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28 #include "mupdf/fitz/output.h"
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30 #define FZ_HASH_TABLE_KEY_LENGTH 48
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32 /**
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33 Generic hash-table with fixed-length keys.
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35 The keys and values are NOT reference counted by the hash table.
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36 Callers are responsible for taking care the reference counts are
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37 correct. Inserting a duplicate entry will NOT overwrite the old
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38 value, and will return the old value.
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40 The drop_val callback function is only used to release values
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41 when the hash table is destroyed.
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42 */
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44 typedef struct fz_hash_table fz_hash_table;
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46 /**
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47 Function type called when a hash table entry is dropped.
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49 Only used when the entire hash table is dropped.
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50 */
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51 typedef void (fz_hash_table_drop_fn)(fz_context *ctx, void *val);
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53 /**
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54 Create a new hash table.
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56 initialsize: The initial size of the hashtable. The hashtable
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57 may grow (double in size) if it starts to get crowded (80%
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58 full).
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60 keylen: byte length for each key.
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62 lock: -1 for no lock, otherwise the FZ_LOCK to use to protect
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63 this table.
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65 drop_val: Function to use to destroy values on table drop.
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66 */
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67 fz_hash_table *fz_new_hash_table(fz_context *ctx, int initialsize, int keylen, int lock, fz_hash_table_drop_fn *drop_val);
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69 /**
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70 Destroy the hash table.
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72 Values are dropped using the drop function.
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73 */
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74 void fz_drop_hash_table(fz_context *ctx, fz_hash_table *table);
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76 /**
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77 Search for a matching hash within the table, and return the
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78 associated value.
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79 */
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80 void *fz_hash_find(fz_context *ctx, fz_hash_table *table, const void *key);
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82 /**
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83 Insert a new key/value pair into the hash table.
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85 If an existing entry with the same key is found, no change is
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86 made to the hash table, and a pointer to the existing value is
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87 returned.
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89 If no existing entry with the same key is found, ownership of
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90 val passes in, key is copied, and NULL is returned.
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91 */
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92 void *fz_hash_insert(fz_context *ctx, fz_hash_table *table, const void *key, void *val);
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94 /**
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95 Remove the entry for a given key.
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97 The value is NOT freed, so the caller is expected to take care
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98 of this.
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99 */
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100 void fz_hash_remove(fz_context *ctx, fz_hash_table *table, const void *key);
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101
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102 /**
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103 Callback function called on each key/value pair in the hash
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104 table, when fz_hash_for_each is run.
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105 */
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106 typedef void (fz_hash_table_for_each_fn)(fz_context *ctx, void *state, void *key, int keylen, void *val);
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107
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108 /**
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109 Iterate over the entries in a hash table.
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110 */
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111 void fz_hash_for_each(fz_context *ctx, fz_hash_table *table, void *state, fz_hash_table_for_each_fn *callback);
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112
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113 /**
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114 Callback function called on each key/value pair in the hash
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115 table, when fz_hash_filter is run to remove entries where the
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116 callback returns true.
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117 */
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118 typedef int (fz_hash_table_filter_fn)(fz_context *ctx, void *state, void *key, int keylen, void *val);
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119
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120 /**
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121 Iterate over the entries in a hash table, removing all the ones where callback returns true.
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122 Does NOT free the value of the entry, so the caller is expected to take care of this.
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123 */
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124 void fz_hash_filter(fz_context *ctx, fz_hash_table *table, void *state, fz_hash_table_filter_fn *callback);
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125
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126 #endif