Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1 | |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 2 | /* pngmem.c - stub functions for memory allocation |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | f9f2fe0 | 1998-03-15 18:20:23 -0600 | [diff] [blame^] | 4 | * libpng 1.0.1 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 7 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | 2687fcc | 1998-01-07 20:54:20 -0600 | [diff] [blame] | 8 | * Copyright (c) 1998, Glenn Randers-Pehrson |
Glenn Randers-Pehrson | f9f2fe0 | 1998-03-15 18:20:23 -0600 | [diff] [blame^] | 9 | * March 15, 1998 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 10 | * |
| 11 | * This file provides a location for all memory allocation. Users which |
| 12 | * need special memory handling are expected to modify the code in this file |
| 13 | * to meet their needs. See the instructions at each function. |
| 14 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 15 | |
| 16 | #define PNG_INTERNAL |
| 17 | #include "png.h" |
| 18 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 19 | /* The following "hides" PNG_MALLOC and PNG_FREE thus allowing the pngtest |
| 20 | application to put a wrapper on top of them. */ |
| 21 | #ifdef PNGTEST_MEMORY_DEBUG |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 22 | #define PNG_MALLOC png_debug_malloc |
| 23 | #define PNG_FREE png_debug_free |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 24 | #else |
Glenn Randers-Pehrson | ea3bcd7 | 1998-03-07 14:33:00 -0600 | [diff] [blame] | 25 | #define PNG_MALLOC png_malloc |
| 26 | #define PNG_FREE png_free |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 27 | #endif |
| 28 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 29 | /* Borland DOS special memory handler */ |
| 30 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 31 | /* if you change this, be sure to change the one in png.h also */ |
| 32 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 33 | /* Allocate memory for a png_struct. The malloc and memset can be replaced |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 34 | by a single call to calloc() if this is thought to improve performance. */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 35 | png_voidp |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 36 | png_create_struct(int type) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 37 | { |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 38 | png_size_t size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 39 | png_voidp struct_ptr; |
| 40 | |
| 41 | if (type == PNG_STRUCT_INFO) |
| 42 | size = sizeof(png_info); |
| 43 | else if (type == PNG_STRUCT_PNG) |
| 44 | size = sizeof(png_struct); |
| 45 | else |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 46 | return ((png_voidp)NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 47 | |
| 48 | if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
| 49 | { |
| 50 | png_memset(struct_ptr, 0, size); |
| 51 | } |
| 52 | |
| 53 | return (struct_ptr); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | /* Free memory allocated by a png_create_struct() call */ |
| 58 | void |
| 59 | png_destroy_struct(png_voidp struct_ptr) |
| 60 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 61 | if (struct_ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 62 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 63 | farfree (struct_ptr); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 64 | struct_ptr = NULL; |
| 65 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 66 | } |
| 67 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 68 | /* Allocate memory. For reasonable files, size should never exceed |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 69 | * 64K. However, zlib may allocate more then 64K if you don't tell |
| 70 | * it not to. See zconf.h and png.h for more information. zlib does |
| 71 | * need to allocate exactly 64K, so whatever you call here must |
| 72 | * have the ability to do that. |
| 73 | * |
| 74 | * Borland seems to have a problem in DOS mode for exactly 64K. |
| 75 | * It gives you a segment with an offset of 8 (perhaps to store it's |
| 76 | * memory stuff). zlib doesn't like this at all, so we have to |
| 77 | * detect and deal with it. This code should not be needed in |
| 78 | * Windows or OS/2 modes, and only in 16 bit mode. This code has |
| 79 | * been updated by Alexander Lehmann for version 0.89 to waste less |
| 80 | * memory. |
| 81 | * |
| 82 | * Note that we can't use png_size_t for the "size" declaration, |
| 83 | * since on some systems a png_size_t is a 16-bit quantity, and as a |
| 84 | * result, we would be truncating potentially larger memory requests |
| 85 | * (which should cause a fatal error) and introducing major problems. |
| 86 | */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 87 | png_voidp |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 88 | PNG_MALLOC(png_structp png_ptr, png_uint_32 size) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 89 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 90 | png_voidp ret; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 91 | if (png_ptr == NULL || size == 0) |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 92 | return ((png_voidp)NULL); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 93 | |
| 94 | #ifdef PNG_MAX_MALLOC_64K |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 95 | if (size > (png_uint_32)65536L) |
| 96 | png_error(png_ptr, "Cannot Allocate > 64K"); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 97 | #endif |
| 98 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 99 | if (size == (png_uint_32)65536L) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 100 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 101 | if (png_ptr->offset_table == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 102 | { |
| 103 | /* try to see if we need to do any of this fancy stuff */ |
| 104 | ret = farmalloc(size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 105 | if (ret == NULL || ((png_size_t)ret & 0xffff)) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 106 | { |
| 107 | int num_blocks; |
| 108 | png_uint_32 total_size; |
| 109 | png_bytep table; |
| 110 | int i; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 111 | png_byte huge * hptr; |
| 112 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 113 | if (ret != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 114 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 115 | farfree(ret); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 116 | ret = NULL; |
| 117 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 118 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 119 | num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); |
| 120 | if (num_blocks < 1) |
| 121 | num_blocks = 1; |
| 122 | if (png_ptr->zlib_mem_level >= 7) |
| 123 | num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7)); |
| 124 | else |
| 125 | num_blocks++; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 126 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 127 | total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 128 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 129 | table = farmalloc(total_size); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 130 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 131 | if (table == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 132 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 133 | png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 134 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 135 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 136 | if ((png_size_t)table & 0xfff0) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 137 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 138 | png_error(png_ptr, "Farmalloc didn't return normalized pointer"); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 139 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 140 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 141 | png_ptr->offset_table = table; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 142 | png_ptr->offset_table_ptr = farmalloc(num_blocks * |
| 143 | sizeof (png_bytep)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 144 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 145 | if (png_ptr->offset_table_ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 146 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 147 | png_error(png_ptr, "Out Of memory."); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | hptr = (png_byte huge *)table; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 151 | if ((png_size_t)hptr & 0xf) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 152 | { |
| 153 | hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); |
| 154 | hptr += 16L; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 155 | } |
| 156 | for (i = 0; i < num_blocks; i++) |
| 157 | { |
| 158 | png_ptr->offset_table_ptr[i] = (png_bytep)hptr; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 159 | hptr += (png_uint_32)65536L; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 160 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 161 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 162 | png_ptr->offset_table_number = num_blocks; |
| 163 | png_ptr->offset_table_count = 0; |
| 164 | png_ptr->offset_table_count_free = 0; |
| 165 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 166 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 167 | |
| 168 | if (png_ptr->offset_table_count >= png_ptr->offset_table_number) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 169 | png_error(png_ptr, "Out of Memory."); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 170 | |
| 171 | ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 172 | } |
| 173 | else |
| 174 | ret = farmalloc(size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 175 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 176 | if (ret == NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 177 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 178 | png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 179 | } |
| 180 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 181 | return (ret); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 182 | } |
| 183 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 184 | /* free a pointer allocated by PNG_MALLOC(). In the default |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 185 | configuration, png_ptr is not used, but is passed in case it |
| 186 | is needed. If ptr is NULL, return without taking any action. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 187 | void |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 188 | PNG_FREE(png_structp png_ptr, png_voidp ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 189 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 190 | if (png_ptr == NULL || ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 191 | return; |
| 192 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 193 | if (png_ptr->offset_table != NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 194 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 195 | int i; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 196 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 197 | for (i = 0; i < png_ptr->offset_table_count; i++) |
| 198 | { |
| 199 | if (ptr == png_ptr->offset_table_ptr[i]) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 200 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 201 | ptr = NULL; |
| 202 | png_ptr->offset_table_count_free++; |
| 203 | break; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 204 | } |
| 205 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 206 | if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) |
| 207 | { |
| 208 | farfree(png_ptr->offset_table); |
| 209 | farfree(png_ptr->offset_table_ptr); |
| 210 | png_ptr->offset_table = NULL; |
| 211 | png_ptr->offset_table_ptr = NULL; |
| 212 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 213 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 214 | |
| 215 | if (ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 216 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 217 | farfree(ptr); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 218 | ptr = NULL; |
| 219 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | #else /* Not the Borland DOS special memory handler */ |
| 223 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 224 | /* Allocate memory for a png_struct or a png_info. The malloc and |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 225 | memset can be replaced by a single call to calloc() if this is thought |
| 226 | to improve performance noticably.*/ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 227 | png_voidp |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 228 | png_create_struct(int type) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 229 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 230 | png_size_t size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 231 | png_voidp struct_ptr; |
| 232 | |
| 233 | if (type == PNG_STRUCT_INFO) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 234 | size = sizeof(png_info); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 235 | else if (type == PNG_STRUCT_PNG) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 236 | size = sizeof(png_struct); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 237 | else |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 238 | return ((png_voidp)NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 239 | |
| 240 | #if defined(__TURBOC__) && !defined(__FLAT__) |
| 241 | if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
| 242 | #else |
| 243 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 244 | if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 245 | # else |
| 246 | if ((struct_ptr = (png_voidp)malloc(size)) != NULL) |
| 247 | # endif |
| 248 | #endif |
| 249 | { |
| 250 | png_memset(struct_ptr, 0, size); |
| 251 | } |
| 252 | |
| 253 | return (struct_ptr); |
| 254 | } |
| 255 | |
| 256 | |
| 257 | /* Free memory allocated by a png_create_struct() call */ |
| 258 | void |
| 259 | png_destroy_struct(png_voidp struct_ptr) |
| 260 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 261 | if (struct_ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 262 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 263 | #if defined(__TURBOC__) && !defined(__FLAT__) |
| 264 | farfree(struct_ptr); |
| 265 | #else |
| 266 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 267 | hfree(struct_ptr); |
| 268 | # else |
| 269 | free(struct_ptr); |
| 270 | # endif |
| 271 | #endif |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 272 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 276 | /* Allocate memory. For reasonable files, size should never exceed |
| 277 | 64K. However, zlib may allocate more then 64K if you don't tell |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 278 | it not to. See zconf.h and png.h for more information. zlib does |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 279 | need to allocate exactly 64K, so whatever you call here must |
| 280 | have the ability to do that. */ |
| 281 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 282 | png_voidp |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 283 | PNG_MALLOC(png_structp png_ptr, png_uint_32 size) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 284 | { |
| 285 | png_voidp ret; |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 286 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 287 | if (png_ptr == NULL || size == 0) |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 288 | return ((png_voidp)NULL); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 289 | |
| 290 | #ifdef PNG_MAX_MALLOC_64K |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 291 | if (size > (png_uint_32)65536L) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 292 | png_error(png_ptr, "Cannot Allocate > 64K"); |
| 293 | #endif |
| 294 | |
| 295 | #if defined(__TURBOC__) && !defined(__FLAT__) |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 296 | ret = farmalloc(size); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 297 | #else |
| 298 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 299 | ret = halloc(size, 1); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 300 | # else |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 301 | ret = malloc((size_t)size); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 302 | # endif |
| 303 | #endif |
| 304 | |
| 305 | if (ret == NULL) |
| 306 | { |
| 307 | png_error(png_ptr, "Out of Memory"); |
| 308 | } |
| 309 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 310 | return (ret); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 311 | } |
| 312 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 313 | /* Free a pointer allocated by PNG_MALLOC(). In the default |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 314 | configuration, png_ptr is not used, but is passed in case it |
| 315 | is needed. If ptr is NULL, return without taking any action. */ |
| 316 | void |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 317 | PNG_FREE(png_structp png_ptr, png_voidp ptr) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 318 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 319 | if (png_ptr == NULL || ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 320 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 321 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 322 | #if defined(__TURBOC__) && !defined(__FLAT__) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 323 | farfree(ptr); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 324 | #else |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 325 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 326 | hfree(ptr); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 327 | # else |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 328 | free(ptr); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 329 | # endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 330 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 331 | } |
| 332 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 333 | #endif /* Not Borland DOS special memory handler */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 334 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 335 | png_voidp |
| 336 | png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 337 | png_uint_32 length) |
| 338 | { |
| 339 | png_size_t size; |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 340 | |
| 341 | size = (png_size_t)length; |
| 342 | if ((png_uint_32)size != length) |
| 343 | png_error(png_ptr,"Overflow in png_memcpy_check."); |
| 344 | |
| 345 | return(png_memcpy (s1, s2, size)); |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 346 | } |
| 347 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 348 | png_voidp |
| 349 | png_memset_check (png_structp png_ptr, png_voidp s1, int value, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 350 | png_uint_32 length) |
| 351 | { |
| 352 | png_size_t size; |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 353 | |
| 354 | size = (png_size_t)length; |
| 355 | if ((png_uint_32)size != length) |
| 356 | png_error(png_ptr,"Overflow in png_memset_check."); |
| 357 | |
| 358 | return (png_memset (s1, value, size)); |
| 359 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 360 | } |