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 | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 4 | * libpng 1.0.1e - June 6, 1998 |
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 | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 9 | * |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 10 | * This file provides a location for all memory allocation. Users who |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 11 | * need special memory handling are expected to modify the code in this file |
| 12 | * to meet their needs. See the instructions at each function. |
| 13 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 14 | |
| 15 | #define PNG_INTERNAL |
| 16 | #include "png.h" |
| 17 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 18 | /* Borland DOS special memory handler */ |
| 19 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 20 | /* if you change this, be sure to change the one in png.h also */ |
| 21 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 22 | /* 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] | 23 | 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] | 24 | png_voidp |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 25 | png_create_struct(int type) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 26 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 27 | #ifdef PNG_USER_MEM_SUPPORTED |
| 28 | return (png_create_struct_2(type, NULL)); |
| 29 | } |
| 30 | |
| 31 | /* Alternate version of png_create_struct, for use with user-defined malloc. */ |
| 32 | png_voidp |
| 33 | png_create_struct_2(int type, png_malloc_ptr malloc_fn) |
| 34 | { |
| 35 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 36 | png_size_t size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 37 | png_voidp struct_ptr; |
| 38 | |
| 39 | if (type == PNG_STRUCT_INFO) |
| 40 | size = sizeof(png_info); |
| 41 | else if (type == PNG_STRUCT_PNG) |
| 42 | size = sizeof(png_struct); |
| 43 | else |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 44 | return ((png_voidp)NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 45 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 46 | #ifdef PNG_USER_MEM_SUPPORTED |
| 47 | if(malloc_fn != NULL) |
| 48 | { |
| 49 | if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL) |
| 50 | png_memset(struct_ptr, 0, size); |
| 51 | return (struct_ptr); |
| 52 | } |
| 53 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 54 | if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
| 55 | { |
| 56 | png_memset(struct_ptr, 0, size); |
| 57 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 58 | return (struct_ptr); |
| 59 | } |
| 60 | |
| 61 | |
| 62 | /* Free memory allocated by a png_create_struct() call */ |
| 63 | void |
| 64 | png_destroy_struct(png_voidp struct_ptr) |
| 65 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 66 | #ifdef PNG_USER_MEM_SUPPORTED |
| 67 | png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL); |
| 68 | } |
| 69 | |
| 70 | /* Free memory allocated by a png_create_struct() call */ |
| 71 | void |
| 72 | png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn) |
| 73 | { |
| 74 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 75 | if (struct_ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 76 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 77 | #ifdef PNG_USER_MEM_SUPPORTED |
| 78 | if(free_fn != NULL) |
| 79 | { |
| 80 | png_struct dummy_struct; |
| 81 | png_structp png_ptr = &dummy_struct; |
| 82 | (*(free_fn))(png_ptr, struct_ptr); |
| 83 | struct_ptr = NULL; |
| 84 | return; |
| 85 | } |
| 86 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 87 | farfree (struct_ptr); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 88 | struct_ptr = NULL; |
| 89 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 90 | } |
| 91 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 92 | /* Allocate memory. For reasonable files, size should never exceed |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 93 | * 64K. However, zlib may allocate more then 64K if you don't tell |
| 94 | * it not to. See zconf.h and png.h for more information. zlib does |
| 95 | * need to allocate exactly 64K, so whatever you call here must |
| 96 | * have the ability to do that. |
| 97 | * |
| 98 | * Borland seems to have a problem in DOS mode for exactly 64K. |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 99 | * It gives you a segment with an offset of 8 (perhaps to store its |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 100 | * memory stuff). zlib doesn't like this at all, so we have to |
| 101 | * detect and deal with it. This code should not be needed in |
| 102 | * Windows or OS/2 modes, and only in 16 bit mode. This code has |
| 103 | * been updated by Alexander Lehmann for version 0.89 to waste less |
| 104 | * memory. |
| 105 | * |
| 106 | * Note that we can't use png_size_t for the "size" declaration, |
| 107 | * since on some systems a png_size_t is a 16-bit quantity, and as a |
| 108 | * result, we would be truncating potentially larger memory requests |
| 109 | * (which should cause a fatal error) and introducing major problems. |
| 110 | */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 111 | png_voidp |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 112 | png_malloc(png_structp png_ptr, png_uint_32 size) |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 113 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 114 | #ifndef PNG_USER_MEM_SUPPORTED |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 115 | png_voidp ret; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 116 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 117 | if (png_ptr == NULL || size == 0) |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 118 | return ((png_voidp)NULL); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 119 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 120 | #ifdef PNG_USER_MEM_SUPPORTED |
| 121 | if(png_ptr->malloc_fn != NULL) |
| 122 | return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size)); |
| 123 | else |
| 124 | return png_malloc_default(png_ptr, size); |
| 125 | } |
| 126 | |
| 127 | png_voidp |
| 128 | png_malloc_default(png_structp png_ptr, png_uint_32 size) |
| 129 | { |
| 130 | png_voidp ret; |
| 131 | #endif PNG_USER_MEM_SUPPORTED |
| 132 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 133 | #ifdef PNG_MAX_MALLOC_64K |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 134 | if (size > (png_uint_32)65536L) |
| 135 | png_error(png_ptr, "Cannot Allocate > 64K"); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 136 | #endif |
| 137 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 138 | if (size == (png_uint_32)65536L) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 139 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 140 | if (png_ptr->offset_table == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 141 | { |
| 142 | /* try to see if we need to do any of this fancy stuff */ |
| 143 | ret = farmalloc(size); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 144 | if (ret == NULL || ((png_size_t)ret & 0xffff)) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 145 | { |
| 146 | int num_blocks; |
| 147 | png_uint_32 total_size; |
| 148 | png_bytep table; |
| 149 | int i; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 150 | png_byte huge * hptr; |
| 151 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 152 | if (ret != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 153 | { |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 154 | farfree(ret); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 155 | ret = NULL; |
| 156 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 157 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 158 | num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14)); |
| 159 | if (num_blocks < 1) |
| 160 | num_blocks = 1; |
| 161 | if (png_ptr->zlib_mem_level >= 7) |
| 162 | num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7)); |
| 163 | else |
| 164 | num_blocks++; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 165 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 166 | total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 167 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 168 | table = farmalloc(total_size); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 169 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 170 | if (table == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 171 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 172 | png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 173 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 174 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 175 | if ((png_size_t)table & 0xfff0) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 176 | { |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 177 | png_error(png_ptr, "Farmalloc didn't return normalized pointer"); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 178 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 179 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 180 | png_ptr->offset_table = table; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 181 | png_ptr->offset_table_ptr = farmalloc(num_blocks * |
| 182 | sizeof (png_bytep)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 183 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 184 | if (png_ptr->offset_table_ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 185 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 186 | png_error(png_ptr, "Out Of memory."); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | hptr = (png_byte huge *)table; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 190 | if ((png_size_t)hptr & 0xf) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 191 | { |
| 192 | hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); |
| 193 | hptr += 16L; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 194 | } |
| 195 | for (i = 0; i < num_blocks; i++) |
| 196 | { |
| 197 | png_ptr->offset_table_ptr[i] = (png_bytep)hptr; |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 198 | hptr += (png_uint_32)65536L; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 199 | } |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 200 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 201 | png_ptr->offset_table_number = num_blocks; |
| 202 | png_ptr->offset_table_count = 0; |
| 203 | png_ptr->offset_table_count_free = 0; |
| 204 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 205 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 206 | |
| 207 | if (png_ptr->offset_table_count >= png_ptr->offset_table_number) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 208 | png_error(png_ptr, "Out of Memory."); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 209 | |
| 210 | ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 211 | } |
| 212 | else |
| 213 | ret = farmalloc(size); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 214 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 215 | if (ret == NULL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 216 | { |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 217 | png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 218 | } |
| 219 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 220 | return (ret); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 221 | } |
| 222 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 223 | /* free a pointer allocated by png_malloc(). In the default |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 224 | configuration, png_ptr is not used, but is passed in case it |
| 225 | is needed. If ptr is NULL, return without taking any action. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 226 | void |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 227 | png_free(png_structp png_ptr, png_voidp ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 228 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 229 | if (png_ptr == NULL || ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 230 | return; |
| 231 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 232 | #ifdef PNG_USER_MEM_SUPPORTED |
| 233 | if (png_ptr->free_fn != NULL) |
| 234 | { |
| 235 | (*(png_ptr->free_fn))(png_ptr, ptr); |
| 236 | ptr = NULL; |
| 237 | return; |
| 238 | } |
| 239 | else png_free_default(png_ptr, ptr); |
| 240 | } |
| 241 | |
| 242 | void |
| 243 | png_free_default(png_structp png_ptr, png_voidp ptr) |
| 244 | { |
| 245 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 246 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 247 | if (png_ptr->offset_table != NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 248 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 249 | int i; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 250 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 251 | for (i = 0; i < png_ptr->offset_table_count; i++) |
| 252 | { |
| 253 | if (ptr == png_ptr->offset_table_ptr[i]) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 254 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 255 | ptr = NULL; |
| 256 | png_ptr->offset_table_count_free++; |
| 257 | break; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 258 | } |
| 259 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 260 | if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) |
| 261 | { |
| 262 | farfree(png_ptr->offset_table); |
| 263 | farfree(png_ptr->offset_table_ptr); |
| 264 | png_ptr->offset_table = NULL; |
| 265 | png_ptr->offset_table_ptr = NULL; |
| 266 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 267 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 268 | |
| 269 | if (ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 270 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 271 | farfree(ptr); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 272 | ptr = NULL; |
| 273 | } |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | #else /* Not the Borland DOS special memory handler */ |
| 277 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 278 | /* 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] | 279 | memset can be replaced by a single call to calloc() if this is thought |
| 280 | to improve performance noticably.*/ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 281 | png_voidp |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 282 | png_create_struct(int type) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 283 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 284 | #ifdef PNG_USER_MEM_SUPPORTED |
| 285 | return (png_create_struct_2(type, NULL)); |
| 286 | } |
| 287 | |
| 288 | /* Allocate memory for a png_struct or a png_info. The malloc and |
| 289 | memset can be replaced by a single call to calloc() if this is thought |
| 290 | to improve performance noticably.*/ |
| 291 | png_voidp |
| 292 | png_create_struct_2(int type, png_malloc_ptr malloc_fn) |
| 293 | { |
| 294 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 295 | png_size_t size; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 296 | png_voidp struct_ptr; |
| 297 | |
| 298 | if (type == PNG_STRUCT_INFO) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 299 | size = sizeof(png_info); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 300 | else if (type == PNG_STRUCT_PNG) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 301 | size = sizeof(png_struct); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 302 | else |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 303 | return ((png_voidp)NULL); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 304 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 305 | #ifdef PNG_USER_MEM_SUPPORTED |
| 306 | if(malloc_fn != NULL) |
| 307 | { |
| 308 | if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL) |
| 309 | png_memset(struct_ptr, 0, size); |
| 310 | return (struct_ptr); |
| 311 | } |
| 312 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 313 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 314 | #if defined(__TURBOC__) && !defined(__FLAT__) |
| 315 | if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL) |
| 316 | #else |
| 317 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Guy Schalnat | c21f90c | 1996-06-17 16:24:45 -0500 | [diff] [blame] | 318 | if ((struct_ptr = (png_voidp)halloc(size,1)) != NULL) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 319 | # else |
| 320 | if ((struct_ptr = (png_voidp)malloc(size)) != NULL) |
| 321 | # endif |
| 322 | #endif |
| 323 | { |
| 324 | png_memset(struct_ptr, 0, size); |
| 325 | } |
| 326 | |
| 327 | return (struct_ptr); |
| 328 | } |
| 329 | |
| 330 | |
| 331 | /* Free memory allocated by a png_create_struct() call */ |
| 332 | void |
| 333 | png_destroy_struct(png_voidp struct_ptr) |
| 334 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 335 | #ifdef PNG_USER_MEM_SUPPORTED |
| 336 | png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL); |
| 337 | } |
| 338 | |
| 339 | /* Free memory allocated by a png_create_struct() call */ |
| 340 | void |
| 341 | png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn) |
| 342 | { |
| 343 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 344 | if (struct_ptr != NULL) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 345 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 346 | #ifdef PNG_USER_MEM_SUPPORTED |
| 347 | if(free_fn != NULL) |
| 348 | { |
| 349 | png_struct dummy_struct; |
| 350 | png_structp png_ptr = &dummy_struct; |
| 351 | (*(free_fn))(png_ptr, struct_ptr); |
| 352 | struct_ptr = NULL; |
| 353 | return; |
| 354 | } |
| 355 | #endif /* PNG_USER_MEM_SUPPORTED */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 356 | #if defined(__TURBOC__) && !defined(__FLAT__) |
| 357 | farfree(struct_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 358 | struct_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 359 | #else |
| 360 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
| 361 | hfree(struct_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 362 | struct_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 363 | # else |
| 364 | free(struct_ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 365 | struct_ptr = NULL; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 366 | # endif |
| 367 | #endif |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 368 | } |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 372 | /* Allocate memory. For reasonable files, size should never exceed |
| 373 | 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] | 374 | 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] | 375 | need to allocate exactly 64K, so whatever you call here must |
| 376 | have the ability to do that. */ |
| 377 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 378 | png_voidp |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 379 | png_malloc(png_structp png_ptr, png_uint_32 size) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 380 | { |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 381 | #ifndef PNG_USER_MEM_SUPPORTED |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 382 | png_voidp ret; |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 383 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 384 | if (png_ptr == NULL || size == 0) |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 385 | return ((png_voidp)NULL); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 386 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 387 | #ifdef PNG_USER_MEM_SUPPORTED |
| 388 | if(png_ptr->malloc_fn != NULL) |
| 389 | return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size)); |
| 390 | else |
| 391 | return (png_malloc_default(png_ptr, size)); |
| 392 | } |
| 393 | png_voidp |
| 394 | png_malloc_default(png_structp png_ptr, png_uint_32 size) |
| 395 | { |
| 396 | png_voidp ret; |
| 397 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 398 | |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 399 | #ifdef PNG_MAX_MALLOC_64K |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 400 | if (size > (png_uint_32)65536L) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 401 | png_error(png_ptr, "Cannot Allocate > 64K"); |
| 402 | #endif |
| 403 | |
| 404 | #if defined(__TURBOC__) && !defined(__FLAT__) |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 405 | ret = farmalloc(size); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 406 | #else |
| 407 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 408 | ret = halloc(size, 1); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 409 | # else |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 410 | ret = malloc((size_t)size); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 411 | # endif |
| 412 | #endif |
| 413 | |
| 414 | if (ret == NULL) |
| 415 | { |
| 416 | png_error(png_ptr, "Out of Memory"); |
| 417 | } |
| 418 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 419 | return (ret); |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 420 | } |
| 421 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 422 | /* Free a pointer allocated by png_malloc(). If ptr is NULL, return |
| 423 | without taking any action. */ |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 424 | void |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 425 | png_free(png_structp png_ptr, png_voidp ptr) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 426 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 427 | if (png_ptr == NULL || ptr == NULL) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 428 | return; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 429 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 430 | #ifdef PNG_USER_MEM_SUPPORTED |
| 431 | if (png_ptr->free_fn != NULL) |
| 432 | { |
| 433 | (*(png_ptr->free_fn))(png_ptr, ptr); |
| 434 | ptr = NULL; |
| 435 | return; |
| 436 | } |
| 437 | else png_free_default(png_ptr, ptr); |
| 438 | } |
| 439 | void |
| 440 | png_free_default(png_structp png_ptr, png_voidp ptr) |
| 441 | { |
| 442 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 443 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 444 | #if defined(__TURBOC__) && !defined(__FLAT__) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 445 | farfree(ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 446 | ptr = NULL; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 447 | #else |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 448 | # if defined(_MSC_VER) && defined(MAXSEG_64K) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 449 | hfree(ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 450 | ptr = NULL; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 451 | # else |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 452 | free(ptr); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 453 | ptr = NULL; |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 454 | # endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 455 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 456 | } |
| 457 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 458 | #endif /* Not Borland DOS special memory handler */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 459 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 460 | png_voidp |
| 461 | 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] | 462 | png_uint_32 length) |
| 463 | { |
| 464 | png_size_t size; |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 465 | |
| 466 | size = (png_size_t)length; |
| 467 | if ((png_uint_32)size != length) |
| 468 | png_error(png_ptr,"Overflow in png_memcpy_check."); |
| 469 | |
| 470 | return(png_memcpy (s1, s2, size)); |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 471 | } |
| 472 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 473 | png_voidp |
| 474 | 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] | 475 | png_uint_32 length) |
| 476 | { |
| 477 | png_size_t size; |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 478 | |
| 479 | size = (png_size_t)length; |
| 480 | if ((png_uint_32)size != length) |
| 481 | png_error(png_ptr,"Overflow in png_memset_check."); |
| 482 | |
| 483 | return (png_memset (s1, value, size)); |
| 484 | |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 485 | } |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame^] | 486 | |
| 487 | #ifdef PNG_USER_MEM_SUPPORTED |
| 488 | /* This function is called when the application wants to use another method |
| 489 | * of allocating and freeing memory. |
| 490 | */ |
| 491 | void |
| 492 | png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr |
| 493 | malloc_fn, png_free_ptr free_fn) |
| 494 | { |
| 495 | png_ptr->mem_ptr = mem_ptr; |
| 496 | png_ptr->malloc_fn = malloc_fn; |
| 497 | png_ptr->free_fn = free_fn; |
| 498 | } |
| 499 | |
| 500 | /* This function returns a pointer to the mem_ptr associated with the user |
| 501 | * functions. The application should free any memory associated with this |
| 502 | * pointer before png_write_destroy and png_read_destroy are called. |
| 503 | */ |
| 504 | png_voidp |
| 505 | png_get_mem_ptr(png_structp png_ptr) |
| 506 | { |
| 507 | return ((png_voidp)png_ptr->mem_ptr); |
| 508 | } |
| 509 | #endif /* PNG_USER_MEM_SUPPORTED */ |