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annotate libs/libpng/pngmem.c @ 0:b2f14e535253

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initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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rev   line source
nuclear@0 1
nuclear@0 2 /* pngmem.c - stub functions for memory allocation
nuclear@0 3 *
nuclear@0 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@0 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@0 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@0 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@0 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@0 9 *
nuclear@0 10 * This file provides a location for all memory allocation. Users who
nuclear@0 11 * need special memory handling are expected to supply replacement
nuclear@0 12 * functions for png_malloc() and png_free(), and to use
nuclear@0 13 * png_create_read_struct_2() and png_create_write_struct_2() to
nuclear@0 14 * identify the replacement functions.
nuclear@0 15 */
nuclear@0 16
nuclear@0 17 #define PNG_INTERNAL
nuclear@0 18 #include "png.h"
nuclear@0 19 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@0 20
nuclear@0 21 /* Borland DOS special memory handler */
nuclear@0 22 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@0 23 /* if you change this, be sure to change the one in png.h also */
nuclear@0 24
nuclear@0 25 /* Allocate memory for a png_struct. The malloc and memset can be replaced
nuclear@0 26 by a single call to calloc() if this is thought to improve performance. */
nuclear@0 27 png_voidp /* PRIVATE */
nuclear@0 28 png_create_struct(int type)
nuclear@0 29 {
nuclear@0 30 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 31 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@0 32 }
nuclear@0 33
nuclear@0 34 /* Alternate version of png_create_struct, for use with user-defined malloc. */
nuclear@0 35 png_voidp /* PRIVATE */
nuclear@0 36 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@0 37 {
nuclear@0 38 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 39 png_size_t size;
nuclear@0 40 png_voidp struct_ptr;
nuclear@0 41
nuclear@0 42 if (type == PNG_STRUCT_INFO)
nuclear@0 43 size = png_sizeof(png_info);
nuclear@0 44 else if (type == PNG_STRUCT_PNG)
nuclear@0 45 size = png_sizeof(png_struct);
nuclear@0 46 else
nuclear@0 47 return (png_get_copyright(NULL));
nuclear@0 48
nuclear@0 49 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 50 if (malloc_fn != NULL)
nuclear@0 51 {
nuclear@0 52 png_struct dummy_struct;
nuclear@0 53 png_structp png_ptr = &dummy_struct;
nuclear@0 54 png_ptr->mem_ptr=mem_ptr;
nuclear@0 55 struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
nuclear@0 56 }
nuclear@0 57 else
nuclear@0 58 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 59 struct_ptr = (png_voidp)farmalloc(size);
nuclear@0 60 if (struct_ptr != NULL)
nuclear@0 61 png_memset(struct_ptr, 0, size);
nuclear@0 62 return (struct_ptr);
nuclear@0 63 }
nuclear@0 64
nuclear@0 65 /* Free memory allocated by a png_create_struct() call */
nuclear@0 66 void /* PRIVATE */
nuclear@0 67 png_destroy_struct(png_voidp struct_ptr)
nuclear@0 68 {
nuclear@0 69 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 70 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@0 71 }
nuclear@0 72
nuclear@0 73 /* Free memory allocated by a png_create_struct() call */
nuclear@0 74 void /* PRIVATE */
nuclear@0 75 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@0 76 png_voidp mem_ptr)
nuclear@0 77 {
nuclear@0 78 #endif
nuclear@0 79 if (struct_ptr != NULL)
nuclear@0 80 {
nuclear@0 81 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 82 if (free_fn != NULL)
nuclear@0 83 {
nuclear@0 84 png_struct dummy_struct;
nuclear@0 85 png_structp png_ptr = &dummy_struct;
nuclear@0 86 png_ptr->mem_ptr=mem_ptr;
nuclear@0 87 (*(free_fn))(png_ptr, struct_ptr);
nuclear@0 88 return;
nuclear@0 89 }
nuclear@0 90 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 91 farfree (struct_ptr);
nuclear@0 92 }
nuclear@0 93 }
nuclear@0 94
nuclear@0 95 /* Allocate memory. For reasonable files, size should never exceed
nuclear@0 96 * 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@0 97 * it not to. See zconf.h and png.h for more information. zlib does
nuclear@0 98 * need to allocate exactly 64K, so whatever you call here must
nuclear@0 99 * have the ability to do that.
nuclear@0 100 *
nuclear@0 101 * Borland seems to have a problem in DOS mode for exactly 64K.
nuclear@0 102 * It gives you a segment with an offset of 8 (perhaps to store its
nuclear@0 103 * memory stuff). zlib doesn't like this at all, so we have to
nuclear@0 104 * detect and deal with it. This code should not be needed in
nuclear@0 105 * Windows or OS/2 modes, and only in 16 bit mode. This code has
nuclear@0 106 * been updated by Alexander Lehmann for version 0.89 to waste less
nuclear@0 107 * memory.
nuclear@0 108 *
nuclear@0 109 * Note that we can't use png_size_t for the "size" declaration,
nuclear@0 110 * since on some systems a png_size_t is a 16-bit quantity, and as a
nuclear@0 111 * result, we would be truncating potentially larger memory requests
nuclear@0 112 * (which should cause a fatal error) and introducing major problems.
nuclear@0 113 */
nuclear@0 114
nuclear@0 115 png_voidp PNGAPI
nuclear@0 116 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@0 117 {
nuclear@0 118 png_voidp ret;
nuclear@0 119
nuclear@0 120 if (png_ptr == NULL || size == 0)
nuclear@0 121 return (NULL);
nuclear@0 122
nuclear@0 123 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 124 if (png_ptr->malloc_fn != NULL)
nuclear@0 125 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@0 126 else
nuclear@0 127 ret = (png_malloc_default(png_ptr, size));
nuclear@0 128 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 129 png_error(png_ptr, "Out of memory!");
nuclear@0 130 return (ret);
nuclear@0 131 }
nuclear@0 132
nuclear@0 133 png_voidp PNGAPI
nuclear@0 134 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@0 135 {
nuclear@0 136 png_voidp ret;
nuclear@0 137 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 138
nuclear@0 139 if (png_ptr == NULL || size == 0)
nuclear@0 140 return (NULL);
nuclear@0 141
nuclear@0 142 #ifdef PNG_MAX_MALLOC_64K
nuclear@0 143 if (size > (png_uint_32)65536L)
nuclear@0 144 {
nuclear@0 145 png_warning(png_ptr, "Cannot Allocate > 64K");
nuclear@0 146 ret = NULL;
nuclear@0 147 }
nuclear@0 148 else
nuclear@0 149 #endif
nuclear@0 150
nuclear@0 151 if (size != (size_t)size)
nuclear@0 152 ret = NULL;
nuclear@0 153 else if (size == (png_uint_32)65536L)
nuclear@0 154 {
nuclear@0 155 if (png_ptr->offset_table == NULL)
nuclear@0 156 {
nuclear@0 157 /* try to see if we need to do any of this fancy stuff */
nuclear@0 158 ret = farmalloc(size);
nuclear@0 159 if (ret == NULL || ((png_size_t)ret & 0xffff))
nuclear@0 160 {
nuclear@0 161 int num_blocks;
nuclear@0 162 png_uint_32 total_size;
nuclear@0 163 png_bytep table;
nuclear@0 164 int i;
nuclear@0 165 png_byte huge * hptr;
nuclear@0 166
nuclear@0 167 if (ret != NULL)
nuclear@0 168 {
nuclear@0 169 farfree(ret);
nuclear@0 170 ret = NULL;
nuclear@0 171 }
nuclear@0 172
nuclear@0 173 if (png_ptr->zlib_window_bits > 14)
nuclear@0 174 num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
nuclear@0 175 else
nuclear@0 176 num_blocks = 1;
nuclear@0 177 if (png_ptr->zlib_mem_level >= 7)
nuclear@0 178 num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
nuclear@0 179 else
nuclear@0 180 num_blocks++;
nuclear@0 181
nuclear@0 182 total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
nuclear@0 183
nuclear@0 184 table = farmalloc(total_size);
nuclear@0 185
nuclear@0 186 if (table == NULL)
nuclear@0 187 {
nuclear@0 188 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 189 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 190 png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
nuclear@0 191 else
nuclear@0 192 png_warning(png_ptr, "Out Of Memory.");
nuclear@0 193 #endif
nuclear@0 194 return (NULL);
nuclear@0 195 }
nuclear@0 196
nuclear@0 197 if ((png_size_t)table & 0xfff0)
nuclear@0 198 {
nuclear@0 199 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 200 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 201 png_error(png_ptr,
nuclear@0 202 "Farmalloc didn't return normalized pointer");
nuclear@0 203 else
nuclear@0 204 png_warning(png_ptr,
nuclear@0 205 "Farmalloc didn't return normalized pointer");
nuclear@0 206 #endif
nuclear@0 207 return (NULL);
nuclear@0 208 }
nuclear@0 209
nuclear@0 210 png_ptr->offset_table = table;
nuclear@0 211 png_ptr->offset_table_ptr = farmalloc(num_blocks *
nuclear@0 212 png_sizeof(png_bytep));
nuclear@0 213
nuclear@0 214 if (png_ptr->offset_table_ptr == NULL)
nuclear@0 215 {
nuclear@0 216 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 217 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 218 png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
nuclear@0 219 else
nuclear@0 220 png_warning(png_ptr, "Out Of memory.");
nuclear@0 221 #endif
nuclear@0 222 return (NULL);
nuclear@0 223 }
nuclear@0 224
nuclear@0 225 hptr = (png_byte huge *)table;
nuclear@0 226 if ((png_size_t)hptr & 0xf)
nuclear@0 227 {
nuclear@0 228 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
nuclear@0 229 hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
nuclear@0 230 }
nuclear@0 231 for (i = 0; i < num_blocks; i++)
nuclear@0 232 {
nuclear@0 233 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
nuclear@0 234 hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
nuclear@0 235 }
nuclear@0 236
nuclear@0 237 png_ptr->offset_table_number = num_blocks;
nuclear@0 238 png_ptr->offset_table_count = 0;
nuclear@0 239 png_ptr->offset_table_count_free = 0;
nuclear@0 240 }
nuclear@0 241 }
nuclear@0 242
nuclear@0 243 if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
nuclear@0 244 {
nuclear@0 245 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 246 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 247 png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
nuclear@0 248 else
nuclear@0 249 png_warning(png_ptr, "Out of Memory.");
nuclear@0 250 #endif
nuclear@0 251 return (NULL);
nuclear@0 252 }
nuclear@0 253
nuclear@0 254 ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
nuclear@0 255 }
nuclear@0 256 else
nuclear@0 257 ret = farmalloc(size);
nuclear@0 258
nuclear@0 259 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 260 if (ret == NULL)
nuclear@0 261 {
nuclear@0 262 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 263 png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@0 264 else
nuclear@0 265 png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@0 266 }
nuclear@0 267 #endif
nuclear@0 268
nuclear@0 269 return (ret);
nuclear@0 270 }
nuclear@0 271
nuclear@0 272 /* free a pointer allocated by png_malloc(). In the default
nuclear@0 273 configuration, png_ptr is not used, but is passed in case it
nuclear@0 274 is needed. If ptr is NULL, return without taking any action. */
nuclear@0 275
nuclear@0 276 void PNGAPI
nuclear@0 277 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@0 278 {
nuclear@0 279 if (png_ptr == NULL || ptr == NULL)
nuclear@0 280 return;
nuclear@0 281
nuclear@0 282 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 283 if (png_ptr->free_fn != NULL)
nuclear@0 284 {
nuclear@0 285 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@0 286 return;
nuclear@0 287 }
nuclear@0 288 else png_free_default(png_ptr, ptr);
nuclear@0 289 }
nuclear@0 290
nuclear@0 291 void PNGAPI
nuclear@0 292 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@0 293 {
nuclear@0 294 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 295
nuclear@0 296 if (png_ptr == NULL || ptr == NULL) return;
nuclear@0 297
nuclear@0 298 if (png_ptr->offset_table != NULL)
nuclear@0 299 {
nuclear@0 300 int i;
nuclear@0 301
nuclear@0 302 for (i = 0; i < png_ptr->offset_table_count; i++)
nuclear@0 303 {
nuclear@0 304 if (ptr == png_ptr->offset_table_ptr[i])
nuclear@0 305 {
nuclear@0 306 ptr = NULL;
nuclear@0 307 png_ptr->offset_table_count_free++;
nuclear@0 308 break;
nuclear@0 309 }
nuclear@0 310 }
nuclear@0 311 if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
nuclear@0 312 {
nuclear@0 313 farfree(png_ptr->offset_table);
nuclear@0 314 farfree(png_ptr->offset_table_ptr);
nuclear@0 315 png_ptr->offset_table = NULL;
nuclear@0 316 png_ptr->offset_table_ptr = NULL;
nuclear@0 317 }
nuclear@0 318 }
nuclear@0 319
nuclear@0 320 if (ptr != NULL)
nuclear@0 321 {
nuclear@0 322 farfree(ptr);
nuclear@0 323 }
nuclear@0 324 }
nuclear@0 325
nuclear@0 326 #else /* Not the Borland DOS special memory handler */
nuclear@0 327
nuclear@0 328 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@0 329 memset can be replaced by a single call to calloc() if this is thought
nuclear@0 330 to improve performance noticably. */
nuclear@0 331 png_voidp /* PRIVATE */
nuclear@0 332 png_create_struct(int type)
nuclear@0 333 {
nuclear@0 334 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 335 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@0 336 }
nuclear@0 337
nuclear@0 338 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@0 339 memset can be replaced by a single call to calloc() if this is thought
nuclear@0 340 to improve performance noticably. */
nuclear@0 341 png_voidp /* PRIVATE */
nuclear@0 342 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@0 343 {
nuclear@0 344 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 345 png_size_t size;
nuclear@0 346 png_voidp struct_ptr;
nuclear@0 347
nuclear@0 348 if (type == PNG_STRUCT_INFO)
nuclear@0 349 size = png_sizeof(png_info);
nuclear@0 350 else if (type == PNG_STRUCT_PNG)
nuclear@0 351 size = png_sizeof(png_struct);
nuclear@0 352 else
nuclear@0 353 return (NULL);
nuclear@0 354
nuclear@0 355 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 356 if (malloc_fn != NULL)
nuclear@0 357 {
nuclear@0 358 png_struct dummy_struct;
nuclear@0 359 png_structp png_ptr = &dummy_struct;
nuclear@0 360 png_ptr->mem_ptr=mem_ptr;
nuclear@0 361 struct_ptr = (*(malloc_fn))(png_ptr, size);
nuclear@0 362 if (struct_ptr != NULL)
nuclear@0 363 png_memset(struct_ptr, 0, size);
nuclear@0 364 return (struct_ptr);
nuclear@0 365 }
nuclear@0 366 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 367
nuclear@0 368 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@0 369 struct_ptr = (png_voidp)farmalloc(size);
nuclear@0 370 #else
nuclear@0 371 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@0 372 struct_ptr = (png_voidp)halloc(size, 1);
nuclear@0 373 # else
nuclear@0 374 struct_ptr = (png_voidp)malloc(size);
nuclear@0 375 # endif
nuclear@0 376 #endif
nuclear@0 377 if (struct_ptr != NULL)
nuclear@0 378 png_memset(struct_ptr, 0, size);
nuclear@0 379
nuclear@0 380 return (struct_ptr);
nuclear@0 381 }
nuclear@0 382
nuclear@0 383
nuclear@0 384 /* Free memory allocated by a png_create_struct() call */
nuclear@0 385 void /* PRIVATE */
nuclear@0 386 png_destroy_struct(png_voidp struct_ptr)
nuclear@0 387 {
nuclear@0 388 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 389 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@0 390 }
nuclear@0 391
nuclear@0 392 /* Free memory allocated by a png_create_struct() call */
nuclear@0 393 void /* PRIVATE */
nuclear@0 394 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@0 395 png_voidp mem_ptr)
nuclear@0 396 {
nuclear@0 397 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 398 if (struct_ptr != NULL)
nuclear@0 399 {
nuclear@0 400 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 401 if (free_fn != NULL)
nuclear@0 402 {
nuclear@0 403 png_struct dummy_struct;
nuclear@0 404 png_structp png_ptr = &dummy_struct;
nuclear@0 405 png_ptr->mem_ptr=mem_ptr;
nuclear@0 406 (*(free_fn))(png_ptr, struct_ptr);
nuclear@0 407 return;
nuclear@0 408 }
nuclear@0 409 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 410 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@0 411 farfree(struct_ptr);
nuclear@0 412 #else
nuclear@0 413 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@0 414 hfree(struct_ptr);
nuclear@0 415 # else
nuclear@0 416 free(struct_ptr);
nuclear@0 417 # endif
nuclear@0 418 #endif
nuclear@0 419 }
nuclear@0 420 }
nuclear@0 421
nuclear@0 422 /* Allocate memory. For reasonable files, size should never exceed
nuclear@0 423 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@0 424 it not to. See zconf.h and png.h for more information. zlib does
nuclear@0 425 need to allocate exactly 64K, so whatever you call here must
nuclear@0 426 have the ability to do that. */
nuclear@0 427
nuclear@0 428 png_voidp PNGAPI
nuclear@0 429 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@0 430 {
nuclear@0 431 png_voidp ret;
nuclear@0 432
nuclear@0 433 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 434 if (png_ptr == NULL || size == 0)
nuclear@0 435 return (NULL);
nuclear@0 436
nuclear@0 437 if (png_ptr->malloc_fn != NULL)
nuclear@0 438 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@0 439 else
nuclear@0 440 ret = (png_malloc_default(png_ptr, size));
nuclear@0 441 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 442 png_error(png_ptr, "Out of Memory!");
nuclear@0 443 return (ret);
nuclear@0 444 }
nuclear@0 445
nuclear@0 446 png_voidp PNGAPI
nuclear@0 447 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@0 448 {
nuclear@0 449 png_voidp ret;
nuclear@0 450 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 451
nuclear@0 452 if (png_ptr == NULL || size == 0)
nuclear@0 453 return (NULL);
nuclear@0 454
nuclear@0 455 #ifdef PNG_MAX_MALLOC_64K
nuclear@0 456 if (size > (png_uint_32)65536L)
nuclear@0 457 {
nuclear@0 458 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 459 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 460 png_error(png_ptr, "Cannot Allocate > 64K");
nuclear@0 461 else
nuclear@0 462 #endif
nuclear@0 463 return NULL;
nuclear@0 464 }
nuclear@0 465 #endif
nuclear@0 466
nuclear@0 467 /* Check for overflow */
nuclear@0 468 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@0 469 if (size != (unsigned long)size)
nuclear@0 470 ret = NULL;
nuclear@0 471 else
nuclear@0 472 ret = farmalloc(size);
nuclear@0 473 #else
nuclear@0 474 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@0 475 if (size != (unsigned long)size)
nuclear@0 476 ret = NULL;
nuclear@0 477 else
nuclear@0 478 ret = halloc(size, 1);
nuclear@0 479 # else
nuclear@0 480 if (size != (size_t)size)
nuclear@0 481 ret = NULL;
nuclear@0 482 else
nuclear@0 483 ret = malloc((size_t)size);
nuclear@0 484 # endif
nuclear@0 485 #endif
nuclear@0 486
nuclear@0 487 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@0 488 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@0 489 png_error(png_ptr, "Out of Memory");
nuclear@0 490 #endif
nuclear@0 491
nuclear@0 492 return (ret);
nuclear@0 493 }
nuclear@0 494
nuclear@0 495 /* Free a pointer allocated by png_malloc(). If ptr is NULL, return
nuclear@0 496 without taking any action. */
nuclear@0 497 void PNGAPI
nuclear@0 498 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@0 499 {
nuclear@0 500 if (png_ptr == NULL || ptr == NULL)
nuclear@0 501 return;
nuclear@0 502
nuclear@0 503 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 504 if (png_ptr->free_fn != NULL)
nuclear@0 505 {
nuclear@0 506 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@0 507 return;
nuclear@0 508 }
nuclear@0 509 else png_free_default(png_ptr, ptr);
nuclear@0 510 }
nuclear@0 511 void PNGAPI
nuclear@0 512 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@0 513 {
nuclear@0 514 if (png_ptr == NULL || ptr == NULL)
nuclear@0 515 return;
nuclear@0 516
nuclear@0 517 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 518
nuclear@0 519 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@0 520 farfree(ptr);
nuclear@0 521 #else
nuclear@0 522 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@0 523 hfree(ptr);
nuclear@0 524 # else
nuclear@0 525 free(ptr);
nuclear@0 526 # endif
nuclear@0 527 #endif
nuclear@0 528 }
nuclear@0 529
nuclear@0 530 #endif /* Not Borland DOS special memory handler */
nuclear@0 531
nuclear@0 532 #if defined(PNG_1_0_X)
nuclear@0 533 # define png_malloc_warn png_malloc
nuclear@0 534 #else
nuclear@0 535 /* This function was added at libpng version 1.2.3. The png_malloc_warn()
nuclear@0 536 * function will set up png_malloc() to issue a png_warning and return NULL
nuclear@0 537 * instead of issuing a png_error, if it fails to allocate the requested
nuclear@0 538 * memory.
nuclear@0 539 */
nuclear@0 540 png_voidp PNGAPI
nuclear@0 541 png_malloc_warn(png_structp png_ptr, png_uint_32 size)
nuclear@0 542 {
nuclear@0 543 png_voidp ptr;
nuclear@0 544 png_uint_32 save_flags;
nuclear@0 545 if (png_ptr == NULL) return (NULL);
nuclear@0 546
nuclear@0 547 save_flags = png_ptr->flags;
nuclear@0 548 png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
nuclear@0 549 ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
nuclear@0 550 png_ptr->flags=save_flags;
nuclear@0 551 return(ptr);
nuclear@0 552 }
nuclear@0 553 #endif
nuclear@0 554
nuclear@0 555 png_voidp PNGAPI
nuclear@0 556 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
nuclear@0 557 png_uint_32 length)
nuclear@0 558 {
nuclear@0 559 png_size_t size;
nuclear@0 560
nuclear@0 561 size = (png_size_t)length;
nuclear@0 562 if ((png_uint_32)size != length)
nuclear@0 563 png_error(png_ptr, "Overflow in png_memcpy_check.");
nuclear@0 564
nuclear@0 565 return(png_memcpy (s1, s2, size));
nuclear@0 566 }
nuclear@0 567
nuclear@0 568 png_voidp PNGAPI
nuclear@0 569 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
nuclear@0 570 png_uint_32 length)
nuclear@0 571 {
nuclear@0 572 png_size_t size;
nuclear@0 573
nuclear@0 574 size = (png_size_t)length;
nuclear@0 575 if ((png_uint_32)size != length)
nuclear@0 576 png_error(png_ptr, "Overflow in png_memset_check.");
nuclear@0 577
nuclear@0 578 return (png_memset (s1, value, size));
nuclear@0 579
nuclear@0 580 }
nuclear@0 581
nuclear@0 582 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 583 /* This function is called when the application wants to use another method
nuclear@0 584 * of allocating and freeing memory.
nuclear@0 585 */
nuclear@0 586 void PNGAPI
nuclear@0 587 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
nuclear@0 588 malloc_fn, png_free_ptr free_fn)
nuclear@0 589 {
nuclear@0 590 if (png_ptr != NULL)
nuclear@0 591 {
nuclear@0 592 png_ptr->mem_ptr = mem_ptr;
nuclear@0 593 png_ptr->malloc_fn = malloc_fn;
nuclear@0 594 png_ptr->free_fn = free_fn;
nuclear@0 595 }
nuclear@0 596 }
nuclear@0 597
nuclear@0 598 /* This function returns a pointer to the mem_ptr associated with the user
nuclear@0 599 * functions. The application should free any memory associated with this
nuclear@0 600 * pointer before png_write_destroy and png_read_destroy are called.
nuclear@0 601 */
nuclear@0 602 png_voidp PNGAPI
nuclear@0 603 png_get_mem_ptr(png_structp png_ptr)
nuclear@0 604 {
nuclear@0 605 if (png_ptr == NULL) return (NULL);
nuclear@0 606 return ((png_voidp)png_ptr->mem_ptr);
nuclear@0 607 }
nuclear@0 608 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 609 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */