Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-blob.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
children
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1 /*
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2 * Copyright © 2009 Red Hat, Inc.
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 * Red Hat Author(s): Behdad Esfahbod
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25 */
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27 #if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
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28 #error "Include <hb.h> instead."
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29 #endif
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31 #ifndef HB_BLOB_H
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32 #define HB_BLOB_H
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34 #include "hb-common.h"
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36 HB_BEGIN_DECLS
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39 /**
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40 * hb_memory_mode_t:
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41 * @HB_MEMORY_MODE_DUPLICATE: HarfBuzz immediately makes a copy of the data.
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42 * @HB_MEMORY_MODE_READONLY: HarfBuzz client will never modify the data,
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43 * and HarfBuzz will never modify the data.
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44 * @HB_MEMORY_MODE_WRITABLE: HarfBuzz client made a copy of the data solely
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45 * for HarfBuzz, so HarfBuzz may modify the data.
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46 * @HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE: See above
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47 *
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48 * Data type holding the memory modes available to
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49 * client programs.
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50 *
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51 * Regarding these various memory-modes:
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52 *
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53 * - In no case shall the HarfBuzz client modify memory
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54 * that is passed to HarfBuzz in a blob. If there is
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55 * any such possibility, @HB_MEMORY_MODE_DUPLICATE should be used
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56 * such that HarfBuzz makes a copy immediately,
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57 *
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58 * - Use @HB_MEMORY_MODE_READONLY otherwise, unless you really really
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59 * really know what you are doing,
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60 *
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61 * - @HB_MEMORY_MODE_WRITABLE is appropriate if you really made a
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62 * copy of data solely for the purpose of passing to
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63 * HarfBuzz and doing that just once (no reuse!),
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64 *
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65 * - If the font is mmap()ed, it's okay to use
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66 * @HB_MEMORY_READONLY_MAY_MAKE_WRITABLE, however, using that mode
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67 * correctly is very tricky. Use @HB_MEMORY_MODE_READONLY instead.
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68 **/
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69 typedef enum {
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70 HB_MEMORY_MODE_DUPLICATE,
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71 HB_MEMORY_MODE_READONLY,
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72 HB_MEMORY_MODE_WRITABLE,
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73 HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE
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74 } hb_memory_mode_t;
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75
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76 /**
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77 * hb_blob_t:
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78 *
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79 * Data type for blobs. A blob wraps a chunk of binary
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80 * data and facilitates its lifecycle management between
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81 * a client program and HarfBuzz.
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82 *
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83 **/
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84 typedef struct hb_blob_t hb_blob_t;
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85
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86 HB_EXTERN hb_blob_t *
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87 hb_blob_create (const char *data,
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88 unsigned int length,
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89 hb_memory_mode_t mode,
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90 void *user_data,
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91 hb_destroy_func_t destroy);
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92
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93 HB_EXTERN hb_blob_t *
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94 hb_blob_create_or_fail (const char *data,
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95 unsigned int length,
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96 hb_memory_mode_t mode,
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97 void *user_data,
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98 hb_destroy_func_t destroy);
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99
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100 HB_EXTERN hb_blob_t *
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101 hb_blob_create_from_file (const char *file_name);
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102
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103 HB_EXTERN hb_blob_t *
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104 hb_blob_create_from_file_or_fail (const char *file_name);
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105
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106 /* Always creates with MEMORY_MODE_READONLY.
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107 * Even if the parent blob is writable, we don't
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108 * want the user of the sub-blob to be able to
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109 * modify the parent data as that data may be
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110 * shared among multiple sub-blobs.
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111 */
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112 HB_EXTERN hb_blob_t *
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113 hb_blob_create_sub_blob (hb_blob_t *parent,
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114 unsigned int offset,
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115 unsigned int length);
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116
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117 HB_EXTERN hb_blob_t *
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118 hb_blob_copy_writable_or_fail (hb_blob_t *blob);
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119
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120 HB_EXTERN hb_blob_t *
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121 hb_blob_get_empty (void);
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122
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123 HB_EXTERN hb_blob_t *
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124 hb_blob_reference (hb_blob_t *blob);
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125
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126 HB_EXTERN void
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127 hb_blob_destroy (hb_blob_t *blob);
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128
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129 HB_EXTERN hb_bool_t
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130 hb_blob_set_user_data (hb_blob_t *blob,
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131 hb_user_data_key_t *key,
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132 void * data,
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133 hb_destroy_func_t destroy,
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134 hb_bool_t replace);
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135
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136
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137 HB_EXTERN void *
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138 hb_blob_get_user_data (const hb_blob_t *blob,
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139 hb_user_data_key_t *key);
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140
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141
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142 HB_EXTERN void
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143 hb_blob_make_immutable (hb_blob_t *blob);
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144
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145 HB_EXTERN hb_bool_t
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146 hb_blob_is_immutable (hb_blob_t *blob);
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147
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148
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149 HB_EXTERN unsigned int
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150 hb_blob_get_length (hb_blob_t *blob);
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151
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152 HB_EXTERN const char *
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153 hb_blob_get_data (hb_blob_t *blob, unsigned int *length);
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154
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diff changeset
155 HB_EXTERN char *
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156 hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);
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157
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158 HB_END_DECLS
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159
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160 #endif /* HB_BLOB_H */