Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/pool.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 // 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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23 #include "mupdf/fitz.h"
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25 #include <string.h>
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26 #include <stdio.h>
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28 typedef struct fz_pool_node
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29 {
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30 struct fz_pool_node *next;
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31 char mem[FZ_FLEXIBLE_ARRAY];
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32 } fz_pool_node;
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33
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34 #define POOL_SIZE (4<<10) /* default size of pool blocks */
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35 #define POOL_SELF (1<<10) /* size where allocs are put into their own blocks */
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36
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37 struct fz_pool
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38 {
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39 size_t size;
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40 fz_pool_node *head, *tail;
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41 char *pos, *end;
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42 };
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43
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45 fz_pool *fz_new_pool(fz_context *ctx)
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46 {
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47 fz_pool *pool;
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48 fz_pool_node *node = NULL;
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49
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50 pool = fz_malloc_struct(ctx, fz_pool);
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51 fz_try(ctx)
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52 {
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53 node = Memento_label(fz_calloc(ctx, offsetof(fz_pool_node, mem) + POOL_SIZE, 1), "fz_pool_block");
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54 pool->head = pool->tail = node;
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55 pool->pos = node->mem;
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56 pool->end = node->mem + POOL_SIZE;
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57 }
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58 fz_catch(ctx)
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59 {
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60 fz_free(ctx, pool);
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61 fz_rethrow(ctx);
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62 }
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63
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64 return pool;
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65 }
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66
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67 static void *fz_pool_alloc_oversize(fz_context *ctx, fz_pool *pool, size_t size)
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68 {
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69 fz_pool_node *node;
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70
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71 /* link in memory at the head of the list */
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72 node = Memento_label(fz_calloc(ctx, offsetof(fz_pool_node, mem) + size, 1), "fz_pool_oversize");
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73 node->next = pool->head;
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74 pool->head = node;
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75 pool->size += offsetof(fz_pool_node, mem) + size;
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76
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77 return node->mem;
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78 }
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79
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80 void *fz_pool_alloc(fz_context *ctx, fz_pool *pool, size_t size)
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81 {
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82 char *ptr;
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83
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84 if (size >= POOL_SELF)
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85 return fz_pool_alloc_oversize(ctx, pool, size);
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86
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87 /* round size to pointer alignment (we don't expect to use doubles) */
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88 size = (size + FZ_POINTER_ALIGN_MOD - 1) & ~(FZ_POINTER_ALIGN_MOD-1);
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89
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90 if (pool->pos + size > pool->end)
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91 {
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92 fz_pool_node *node = Memento_label(fz_calloc(ctx, offsetof(fz_pool_node, mem) + POOL_SIZE, 1), "fz_pool_block");
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93 pool->tail = pool->tail->next = node;
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94 pool->pos = node->mem;
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95 pool->end = node->mem + POOL_SIZE;
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96 pool->size += offsetof(fz_pool_node, mem) + POOL_SIZE;
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97 }
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98 ptr = pool->pos;
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99 pool->pos += size;
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100 return ptr;
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101 }
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102
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103 char *fz_pool_strdup(fz_context *ctx, fz_pool *pool, const char *s)
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104 {
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105 size_t n = strlen(s) + 1;
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parents:
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106 char *p = fz_pool_alloc(ctx, pool, n);
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parents:
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107 memcpy(p, s, n);
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parents:
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108 return p;
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parents:
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109 }
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parents:
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110
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parents:
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111 size_t fz_pool_size(fz_context *ctx, fz_pool *pool)
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parents:
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112 {
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113 return pool ? pool->size : 0;
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114 }
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parents:
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115
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parents:
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116 void fz_drop_pool(fz_context *ctx, fz_pool *pool)
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parents:
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117 {
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parents:
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118 fz_pool_node *node;
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parents:
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119
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parents:
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120 if (!pool)
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parents:
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121 return;
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parents:
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122
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parents:
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123 node = pool->head;
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parents:
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124 while (node)
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parents:
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125 {
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parents:
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126 fz_pool_node *next = node->next;
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parents:
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127 fz_free(ctx, node);
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parents:
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128 node = next;
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129 }
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parents:
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130 fz_free(ctx, pool);
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parents:
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131 }