Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/jmemcust.c @ 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 /*
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2 * Copyright (C) 2001-2017 Artifex Software, Inc.
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3 * All Rights Reserved.
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4 *
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5 * This software is provided AS-IS with no warranty, either express or
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6 * implied.
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7 *
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8 * This software is distributed under license and may not be copied,
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9 * modified or distributed except as expressly authorized under the terms
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10 * of the license contained in the file LICENSE in this distribution.
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11 *
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12 * Refer to licensing information at http://www.artifex.com or contact
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13 * Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, San Rafael,
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14 * CA 94903, U.S.A., +1(415)492-9861, for further information.
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15 */
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17 #if !defined(SHARE_JPEG) || SHARE_JPEG==0
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19 #include "jinclude.h"
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20 #include "jpeglib.h"
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21 #include "jmemsys.h"
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22 #include "jerror.h"
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23 #include "jmemcust.h"
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25 GLOBAL(void *)
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26 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
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27 {
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28 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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30 return (void *) (cmem->j_mem_get_small)(cinfo, sizeofobject);
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31 }
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33 GLOBAL(void)
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34 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
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35 {
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36 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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38 (cmem->j_mem_free_small)(cinfo, object, sizeofobject);
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39 }
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41 /*
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42 * "Large" objects are treated the same as "small" ones.
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43 * NB: although we include FAR keywords in the routine declarations,
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44 * this file won't actually work in 80x86 small/medium model; at least,
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45 * you probably won't be able to process useful-size images in only 64KB.
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46 */
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47
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48 GLOBAL(void FAR *)
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49 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
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50 {
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51 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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52
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53 return (void *) (cmem->j_mem_get_large)(cinfo, sizeofobject);
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54 }
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56 GLOBAL(void)
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57 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
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58 {
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59 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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61 (cmem->j_mem_free_large)(cinfo, object, sizeofobject);
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62 }
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64 /*
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65 * This routine computes the total memory space available for allocation.
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66 * Here we always say, "we got all you want bud!"
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67 */
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69 GLOBAL(long)
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70 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
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71 long max_bytes_needed, long already_allocated)
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72 {
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73 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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74 long ret = max_bytes_needed;
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75
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76 if (cmem->j_mem_avail)
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77 ret = (cmem->j_mem_avail)(cinfo);
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79 return ret;
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80 }
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81
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82 /*
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83 * Backing store (temporary file) management.
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84 * Since jpeg_mem_available always promised the moon,
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85 * this should never be called and we can just error out.
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86 */
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87
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88 GLOBAL(void)
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89 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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90 long total_bytes_needed)
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91 {
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92 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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93
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94 if (cmem->j_mem_open_backing_store) {
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95 (cmem->j_mem_open_backing_store)(cinfo, info, total_bytes_needed);
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96 }
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97 else
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98 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
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99 }
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100
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101 /*
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102 * These routines take care of any system-dependent initialization and
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103 * cleanup required. Here, there isn't any.
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104 */
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105
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106 GLOBAL(long)
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107 jpeg_mem_init (j_common_ptr cinfo)
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108 {
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109 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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110 long ret = 0;
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111
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112 if (cmem->j_mem_init)
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113 ret = (cmem->j_mem_init)(cinfo);
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114
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115 return ret;
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116 }
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117
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118 GLOBAL(void)
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119 jpeg_mem_term (j_common_ptr cinfo)
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120 {
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121 jpeg_cust_mem_data *cmem = GET_CUST_MEM_DATA(cinfo);
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122
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123 if (cmem->j_mem_term)
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124 (cmem->j_mem_term)(cinfo);
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125 }
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126
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127 GLOBAL(jpeg_cust_mem_data *)
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128 jpeg_cust_mem_init(jpeg_cust_mem_data *custm, void *priv,
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129 j_custmem_init_ptr init,
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130 j_custmem_term_ptr term,
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131 j_custmem_avail_ptr avail,
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132 j_custmem_get_small_ptr get_small,
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133 j_custmem_free_small_ptr free_small,
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134 j_cust_mem_get_large_ptr get_large,
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135 j_custmem_free_large_ptr free_large,
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136 j_custmem_open_backing_store_ptr open_backing_store)
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137 {
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138 jpeg_cust_mem_data *lcustm = NULL;
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139
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140 /* We need at least the following for a viable memory manager */
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141 if (get_small && free_small && get_large && free_large)
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142 {
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143 lcustm = custm;
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144
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145 lcustm->priv = priv;
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146 lcustm->j_mem_init = init;
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147 lcustm->j_mem_term = term;
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148 lcustm->j_mem_avail = avail;
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149 lcustm->j_mem_get_small = get_small;
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150 lcustm->j_mem_free_small = free_small;
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151 lcustm->j_mem_get_large = get_large;
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152 lcustm->j_mem_free_large = free_large;
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153 lcustm->j_mem_open_backing_store = open_backing_store;
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154 }
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155 return lcustm;
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156 }
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157
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158 #endif /* !defined(SHARE_JPEG) || SHARE_JPEG==0 */