Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/extract/src/alloc.c @ 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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2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 #include "extract/alloc.h"
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2
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3 #include <assert.h>
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4 #include <errno.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7
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8
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9 struct extract_alloc_t
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10 {
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11 extract_realloc_fn_t *realloc_fn;
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12 extract_caller_context_t *realloc_state;
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13 size_t exp_min_alloc_size;
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14 extract_alloc_stats_t stats;
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15 };
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17 int
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18 extract_alloc_create( extract_realloc_fn_t *realloc_fn,
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19 void *realloc_state,
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20 extract_alloc_t **palloc)
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21 {
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22 assert(realloc_fn);
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23 assert(palloc);
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24 *palloc = realloc_fn(realloc_state, NULL /*ptr*/, sizeof(**palloc));
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25 if (!*palloc) {
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26 errno = ENOMEM;
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27 return -1;
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28 }
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29 memset(*palloc, 0, sizeof(**palloc));
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30 (*palloc)->realloc_fn = realloc_fn;
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31 (*palloc)->realloc_state = realloc_state;
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32 (*palloc)->exp_min_alloc_size = 0;
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33 return 0;
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34 }
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36 void extract_alloc_destroy(extract_alloc_t **palloc)
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37 {
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38 if (!*palloc) return;
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39 (*palloc)->realloc_fn((*palloc)->realloc_state, *palloc, 0 /*newsize*/);
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40 *palloc = NULL;
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41 }
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43 extract_alloc_stats_t *extract_alloc_stats(extract_alloc_t *alloc)
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44 {
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45 return &alloc->stats;
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46 }
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47
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48 static size_t round_up(extract_alloc_t *alloc, size_t n)
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49 {
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50 size_t ret;
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51
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52 if (alloc == NULL || alloc->exp_min_alloc_size || n == 0)
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53 return n;
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54
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55 /* Round up to power of two. */
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56 ret = alloc->exp_min_alloc_size;
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57 while (ret < n) {
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58 size_t ret_old = ret;
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59 ret *= 2;
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60 if (ret <= ret_old)
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61 ret = n;
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62 }
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64 return ret;
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65 }
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66
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67 int (extract_malloc)(extract_alloc_t *alloc, void **pptr, size_t size)
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68 {
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69 void *p;
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71 size = round_up(alloc, size);
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72 p = (alloc) ? alloc->realloc_fn(alloc->realloc_state, NULL, size) : malloc(size);
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73 *pptr = p;
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74 if (!p && size)
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75 {
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76 if (alloc) errno = ENOMEM;
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77 return -1;
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78 }
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79 if (alloc) alloc->stats.num_malloc += 1;
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80 return 0;
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81 }
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83 int (extract_realloc)(extract_alloc_t *alloc, void **pptr, size_t newsize)
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84 {
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85 void *p = (alloc) ? alloc->realloc_fn(alloc->realloc_state, *pptr, newsize) : realloc(*pptr, newsize);
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86 if (!p && newsize)
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87 {
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88 if (alloc) errno = ENOMEM;
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89 return -1;
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90 }
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91 *pptr = p;
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92 if (alloc) alloc->stats.num_realloc += 1;
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93 return 0;
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94 }
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95
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96 int (extract_realloc2)(extract_alloc_t *alloc, void **pptr, size_t oldsize, size_t newsize)
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97 {
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98 /* We ignore <oldsize> if <ptr> is NULL - allows callers to not worry
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99 about edge cases e.g. with strlen+1. */
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100 oldsize = (*pptr) ? round_up(alloc, oldsize) : 0;
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101 newsize = round_up(alloc, newsize);
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102 if (newsize == oldsize) return 0;
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103 return (extract_realloc)(alloc, pptr, newsize);
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104 }
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105
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106 void (extract_free)(extract_alloc_t *alloc, void **pptr)
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107 {
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parents:
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108 if (alloc)
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109 (void)alloc->realloc_fn(alloc->realloc_state, *pptr, 0);
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parents:
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110 else
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parents:
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111 free(*pptr);
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parents:
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112 *pptr = NULL;
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parents:
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113 if (alloc) alloc->stats.num_free += 1;
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parents:
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114 }
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115
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parents:
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116 void extract_alloc_exp_min(extract_alloc_t *alloc, size_t size)
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parents:
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117 {
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parents:
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118 alloc->exp_min_alloc_size = size;
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119 }