Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/pdf/pdf-resources.c @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +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) 2004-2025 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 #include "mupdf/pdf.h"
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26 #include <string.h>
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28 static void pdf_drop_obj_as_void(fz_context *ctx, void *obj)
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29 {
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30 pdf_drop_obj(ctx, obj);
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31 }
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32
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33 /* We do need to come up with an effective way to see what is already in the
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34 * file to avoid adding to what is already there. This is avoided for pdfwrite
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35 * as we check as we add each font. For adding text to an existing file though
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36 * it may be more problematic. */
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38 pdf_obj *
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39 pdf_find_font_resource(fz_context *ctx, pdf_document *doc, int type, int encoding, fz_font *item, pdf_font_resource_key *key)
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40 {
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41 pdf_obj *res;
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42
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43 if (!doc->resources.fonts)
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44 doc->resources.fonts = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
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45
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46 memset(key, 0, sizeof(*key));
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47 fz_font_digest(ctx, item, key->digest);
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48
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49 key->type = type;
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50 key->encoding = encoding;
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51 key->local_xref = doc->local_xref_nesting > 0;
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52
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53 res = fz_hash_find(ctx, doc->resources.fonts, (void *)key);
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54 if (res)
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55 pdf_keep_obj(ctx, res);
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56 return res;
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57 }
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58
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59 pdf_obj *
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60 pdf_find_colorspace_resource(fz_context *ctx, pdf_document *doc, fz_colorspace *item, pdf_colorspace_resource_key *key)
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61 {
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62 pdf_obj *res;
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63
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64 if (!doc->resources.colorspaces)
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65 doc->resources.colorspaces = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
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66
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67 memset(key, 0, sizeof(*key));
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68 fz_colorspace_digest(ctx, item, key->digest);
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69
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70 key->local_xref = doc->local_xref_nesting > 0;
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71
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72 res = fz_hash_find(ctx, doc->resources.colorspaces, (void *)key);
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73 if (res)
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74 pdf_keep_obj(ctx, res);
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75 return res;
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76 }
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78 pdf_obj *
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79 pdf_insert_font_resource(fz_context *ctx, pdf_document *doc, pdf_font_resource_key *key, pdf_obj *obj)
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80 {
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81 pdf_obj *res = fz_hash_insert(ctx, doc->resources.fonts, (void *)key, obj);
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82 if (res)
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83 fz_warn(ctx, "warning: font resource already present");
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84 else
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85 res = pdf_keep_obj(ctx, obj);
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86 return pdf_keep_obj(ctx, res);
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87 }
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88
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89 pdf_obj *
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90 pdf_insert_colorspace_resource(fz_context *ctx, pdf_document *doc, pdf_colorspace_resource_key *key, pdf_obj *obj)
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91 {
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92 pdf_obj *res = fz_hash_insert(ctx, doc->resources.colorspaces, (void *)key, obj);
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93 if (res)
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94 fz_warn(ctx, "warning: colorspace resource already present");
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95 else
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96 res = pdf_keep_obj(ctx, obj);
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97 return pdf_keep_obj(ctx, res);
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98 }
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99
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100 static int purge_local_font_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
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101 {
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102 pdf_font_resource_key *key = key_;
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103 if (key->local_xref)
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104 {
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105 pdf_drop_obj(ctx, val);
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106 return 1;
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107 }
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108 return 0;
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109 }
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110
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111 static int purge_local_colorspace_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
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112 {
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113 pdf_colorspace_resource_key *key = key_;
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114 if (key->local_xref)
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115 {
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116 pdf_drop_obj(ctx, val);
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117 return 1;
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118 }
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119 return 0;
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120 }
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121
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122 void
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123 pdf_purge_local_resources(fz_context *ctx, pdf_document *doc)
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124 {
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125 if (doc->resources.fonts)
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126 fz_hash_filter(ctx, doc->resources.fonts, NULL, purge_local_font_resource);
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127 if (doc->resources.colorspaces)
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128 fz_hash_filter(ctx, doc->resources.colorspaces, NULL, purge_local_colorspace_resource);
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129 }
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130
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131 void
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132 pdf_drop_resource_tables(fz_context *ctx, pdf_document *doc)
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133 {
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134 if (doc)
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135 {
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136 fz_drop_hash_table(ctx, doc->resources.colorspaces);
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137 fz_drop_hash_table(ctx, doc->resources.fonts);
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138 }
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139 }