Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jmemnobs.c @ 42:4621bd954a09

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FIX: Need packaging at runtime to because of the parsing of mupdf_version into a tuple. In the merge it was removed erroneously.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:14:12 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * jmemnobs.c
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3 *
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4 * Copyright (C) 1992-1996, Thomas G. Lane.
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5 * Modified 2019 by Guido Vollbeding.
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6 * This file is part of the Independent JPEG Group's software.
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7 * For conditions of distribution and use, see the accompanying README file.
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8 *
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9 * This file provides a really simple implementation of the system-
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10 * dependent portion of the JPEG memory manager. This implementation
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11 * assumes that no backing-store files are needed: all required space
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12 * can be obtained from malloc().
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13 * This is very portable in the sense that it'll compile on almost anything,
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14 * but you'd better have lots of main memory (or virtual memory) if you want
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15 * to process big images.
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16 * Note that the max_memory_to_use option is respected by this implementation.
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17 */
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19 #define JPEG_INTERNALS
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20 #include "jinclude.h"
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21 #include "jpeglib.h"
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22 #include "jmemsys.h" /* import the system-dependent declarations */
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24 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
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25 extern void * malloc JPP((size_t size));
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26 extern void free JPP((void *ptr));
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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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34
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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 */
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72 GLOBAL(long)
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73 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
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74 long max_bytes_needed, long already_allocated)
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75 {
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76 if (cinfo->mem->max_memory_to_use)
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77 return cinfo->mem->max_memory_to_use - already_allocated;
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79 /* Here we say, "we got all you want bud!" */
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80 return max_bytes_needed;
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81 }
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84 /*
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85 * Backing store (temporary file) management.
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86 * Since jpeg_mem_available always promised the moon,
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87 * this should never be called and we can just error out.
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88 */
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90 GLOBAL(void)
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91 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
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92 long total_bytes_needed)
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93 {
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94 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
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95 }
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98 /*
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99 * These routines take care of any system-dependent initialization and
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100 * cleanup required. Here, there isn't any.
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101 */
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102
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103 GLOBAL(long)
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104 jpeg_mem_init (j_common_ptr cinfo)
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105 {
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106 return 0; /* just set max_memory_to_use to 0 */
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107 }
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108
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109 GLOBAL(void)
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110 jpeg_mem_term (j_common_ptr cinfo)
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111 {
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112 /* no work */
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113 }