Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jmemansi.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:
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1 /*
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2 * jmemansi.c
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3 *
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4 * Copyright (C) 1992-1996, Thomas G. Lane.
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5 * This file is part of the Independent JPEG Group's software.
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6 * For conditions of distribution and use, see the accompanying README file.
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7 *
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8 * This file provides a simple generic implementation of the system-
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9 * dependent portion of the JPEG memory manager. This implementation
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10 * assumes that you have the ANSI-standard library routine tmpfile().
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11 * Also, the problem of determining the amount of memory available
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12 * is shoved onto the user.
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13 */
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15 #define JPEG_INTERNALS
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16 #include "jinclude.h"
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17 #include "jpeglib.h"
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18 #include "jmemsys.h" /* import the system-dependent declarations */
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20 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
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21 extern void * malloc JPP((size_t size));
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22 extern void free JPP((void *ptr));
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23 #endif
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25 #ifndef SEEK_SET /* pre-ANSI systems may not define this; */
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26 #define SEEK_SET 0 /* if not, assume 0 is correct */
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27 #endif
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30 /*
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31 * Memory allocation and freeing are controlled by the regular library
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32 * routines malloc() and free().
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33 */
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35 GLOBAL(void *)
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36 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
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37 {
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38 return (void *) malloc(sizeofobject);
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39 }
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41 GLOBAL(void)
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42 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
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43 {
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44 free(object);
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45 }
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48 /*
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49 * "Large" objects are treated the same as "small" ones.
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50 * NB: although we include FAR keywords in the routine declarations,
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51 * this file won't actually work in 80x86 small/medium model; at least,
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52 * you probably won't be able to process useful-size images in only 64KB.
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53 */
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55 GLOBAL(void FAR *)
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56 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
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57 {
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58 return (void FAR *) malloc(sizeofobject);
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59 }
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61 GLOBAL(void)
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62 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
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63 {
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64 free(object);
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65 }
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68 /*
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69 * This routine computes the total memory space available for allocation.
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70 * It's impossible to do this in a portable way; our current solution is
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71 * to make the user tell us (with a default value set at compile time).
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72 * If you can actually get the available space, it's a good idea to subtract
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73 * a slop factor of 5% or so.
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74 */
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76 #ifndef DEFAULT_MAX_MEM /* so can override from makefile */
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77 #define DEFAULT_MAX_MEM 1000000L /* default: one megabyte */
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78 #endif
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80 GLOBAL(long)
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81 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
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82 long max_bytes_needed, long already_allocated)
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83 {
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84 return cinfo->mem->max_memory_to_use - already_allocated;
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85 }
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88 /*
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89 * Backing store (temporary file) management.
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90 * Backing store objects are only used when the value returned by
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91 * jpeg_mem_available is less than the total space needed. You can dispense
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92 * with these routines if you have plenty of virtual memory; see jmemnobs.c.
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93 */
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96 METHODDEF(void)
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97 read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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98 void FAR * buffer_address,
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99 long file_offset, long byte_count)
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100 {
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101 if (fseek(info->temp_file, file_offset, SEEK_SET))
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102 ERREXIT(cinfo, JERR_TFILE_SEEK);
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103 if (JFREAD(info->temp_file, buffer_address, byte_count)
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104 != (size_t) byte_count)
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105 ERREXIT(cinfo, JERR_TFILE_READ);
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106 }
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107
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108
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109 METHODDEF(void)
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110 write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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111 void FAR * buffer_address,
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112 long file_offset, long byte_count)
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113 {
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114 if (fseek(info->temp_file, file_offset, SEEK_SET))
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115 ERREXIT(cinfo, JERR_TFILE_SEEK);
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116 if (JFWRITE(info->temp_file, buffer_address, byte_count)
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117 != (size_t) byte_count)
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118 ERREXIT(cinfo, JERR_TFILE_WRITE);
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119 }
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120
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121
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122 METHODDEF(void)
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123 close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
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124 {
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125 fclose(info->temp_file);
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126 /* Since this implementation uses tmpfile() to create the file,
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127 * no explicit file deletion is needed.
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128 */
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129 }
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130
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131
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132 /*
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133 * Initial opening of a backing-store object.
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134 *
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135 * This version uses tmpfile(), which constructs a suitable file name
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136 * behind the scenes. We don't have to use info->temp_name[] at all;
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137 * indeed, we can't even find out the actual name of the temp file.
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138 */
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139
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diff changeset
140 GLOBAL(void)
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diff changeset
141 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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diff changeset
142 long total_bytes_needed)
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diff changeset
143 {
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144 if ((info->temp_file = tmpfile()) == NULL)
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diff changeset
145 ERREXITS(cinfo, JERR_TFILE_CREATE, "");
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diff changeset
146 info->read_backing_store = read_backing_store;
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diff changeset
147 info->write_backing_store = write_backing_store;
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148 info->close_backing_store = close_backing_store;
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149 }
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diff changeset
150
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parents:
diff changeset
151
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parents:
diff changeset
152 /*
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parents:
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153 * These routines take care of any system-dependent initialization and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
154 * cleanup required.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
155 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
156
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
157 GLOBAL(long)
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parents:
diff changeset
158 jpeg_mem_init (j_common_ptr cinfo)
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parents:
diff changeset
159 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 return DEFAULT_MAX_MEM; /* default for max_memory_to_use */
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parents:
diff changeset
161 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
162
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parents:
diff changeset
163 GLOBAL(void)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 jpeg_mem_term (j_common_ptr cinfo)
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parents:
diff changeset
165 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
166 /* no work */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 }