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annotate libs/libpng/pngmem.c @ 27:fd39c0198935

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author John Tsiombikas <nuclear@mutantstargoat.com>
date Thu, 08 Sep 2011 08:30:00 +0300
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rev   line source
nuclear@26 1
nuclear@26 2 /* pngmem.c - stub functions for memory allocation
nuclear@26 3 *
nuclear@26 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@26 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@26 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26 9 *
nuclear@26 10 * This file provides a location for all memory allocation. Users who
nuclear@26 11 * need special memory handling are expected to supply replacement
nuclear@26 12 * functions for png_malloc() and png_free(), and to use
nuclear@26 13 * png_create_read_struct_2() and png_create_write_struct_2() to
nuclear@26 14 * identify the replacement functions.
nuclear@26 15 */
nuclear@26 16
nuclear@26 17 #define PNG_INTERNAL
nuclear@26 18 #include "png.h"
nuclear@26 19 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26 20
nuclear@26 21 /* Borland DOS special memory handler */
nuclear@26 22 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@26 23 /* if you change this, be sure to change the one in png.h also */
nuclear@26 24
nuclear@26 25 /* Allocate memory for a png_struct. The malloc and memset can be replaced
nuclear@26 26 by a single call to calloc() if this is thought to improve performance. */
nuclear@26 27 png_voidp /* PRIVATE */
nuclear@26 28 png_create_struct(int type)
nuclear@26 29 {
nuclear@26 30 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 31 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@26 32 }
nuclear@26 33
nuclear@26 34 /* Alternate version of png_create_struct, for use with user-defined malloc. */
nuclear@26 35 png_voidp /* PRIVATE */
nuclear@26 36 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@26 37 {
nuclear@26 38 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 39 png_size_t size;
nuclear@26 40 png_voidp struct_ptr;
nuclear@26 41
nuclear@26 42 if (type == PNG_STRUCT_INFO)
nuclear@26 43 size = png_sizeof(png_info);
nuclear@26 44 else if (type == PNG_STRUCT_PNG)
nuclear@26 45 size = png_sizeof(png_struct);
nuclear@26 46 else
nuclear@26 47 return (png_get_copyright(NULL));
nuclear@26 48
nuclear@26 49 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 50 if (malloc_fn != NULL)
nuclear@26 51 {
nuclear@26 52 png_struct dummy_struct;
nuclear@26 53 png_structp png_ptr = &dummy_struct;
nuclear@26 54 png_ptr->mem_ptr=mem_ptr;
nuclear@26 55 struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
nuclear@26 56 }
nuclear@26 57 else
nuclear@26 58 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 59 struct_ptr = (png_voidp)farmalloc(size);
nuclear@26 60 if (struct_ptr != NULL)
nuclear@26 61 png_memset(struct_ptr, 0, size);
nuclear@26 62 return (struct_ptr);
nuclear@26 63 }
nuclear@26 64
nuclear@26 65 /* Free memory allocated by a png_create_struct() call */
nuclear@26 66 void /* PRIVATE */
nuclear@26 67 png_destroy_struct(png_voidp struct_ptr)
nuclear@26 68 {
nuclear@26 69 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 70 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@26 71 }
nuclear@26 72
nuclear@26 73 /* Free memory allocated by a png_create_struct() call */
nuclear@26 74 void /* PRIVATE */
nuclear@26 75 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@26 76 png_voidp mem_ptr)
nuclear@26 77 {
nuclear@26 78 #endif
nuclear@26 79 if (struct_ptr != NULL)
nuclear@26 80 {
nuclear@26 81 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 82 if (free_fn != NULL)
nuclear@26 83 {
nuclear@26 84 png_struct dummy_struct;
nuclear@26 85 png_structp png_ptr = &dummy_struct;
nuclear@26 86 png_ptr->mem_ptr=mem_ptr;
nuclear@26 87 (*(free_fn))(png_ptr, struct_ptr);
nuclear@26 88 return;
nuclear@26 89 }
nuclear@26 90 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 91 farfree (struct_ptr);
nuclear@26 92 }
nuclear@26 93 }
nuclear@26 94
nuclear@26 95 /* Allocate memory. For reasonable files, size should never exceed
nuclear@26 96 * 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@26 97 * it not to. See zconf.h and png.h for more information. zlib does
nuclear@26 98 * need to allocate exactly 64K, so whatever you call here must
nuclear@26 99 * have the ability to do that.
nuclear@26 100 *
nuclear@26 101 * Borland seems to have a problem in DOS mode for exactly 64K.
nuclear@26 102 * It gives you a segment with an offset of 8 (perhaps to store its
nuclear@26 103 * memory stuff). zlib doesn't like this at all, so we have to
nuclear@26 104 * detect and deal with it. This code should not be needed in
nuclear@26 105 * Windows or OS/2 modes, and only in 16 bit mode. This code has
nuclear@26 106 * been updated by Alexander Lehmann for version 0.89 to waste less
nuclear@26 107 * memory.
nuclear@26 108 *
nuclear@26 109 * Note that we can't use png_size_t for the "size" declaration,
nuclear@26 110 * since on some systems a png_size_t is a 16-bit quantity, and as a
nuclear@26 111 * result, we would be truncating potentially larger memory requests
nuclear@26 112 * (which should cause a fatal error) and introducing major problems.
nuclear@26 113 */
nuclear@26 114
nuclear@26 115 png_voidp PNGAPI
nuclear@26 116 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@26 117 {
nuclear@26 118 png_voidp ret;
nuclear@26 119
nuclear@26 120 if (png_ptr == NULL || size == 0)
nuclear@26 121 return (NULL);
nuclear@26 122
nuclear@26 123 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 124 if (png_ptr->malloc_fn != NULL)
nuclear@26 125 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@26 126 else
nuclear@26 127 ret = (png_malloc_default(png_ptr, size));
nuclear@26 128 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 129 png_error(png_ptr, "Out of memory!");
nuclear@26 130 return (ret);
nuclear@26 131 }
nuclear@26 132
nuclear@26 133 png_voidp PNGAPI
nuclear@26 134 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@26 135 {
nuclear@26 136 png_voidp ret;
nuclear@26 137 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 138
nuclear@26 139 if (png_ptr == NULL || size == 0)
nuclear@26 140 return (NULL);
nuclear@26 141
nuclear@26 142 #ifdef PNG_MAX_MALLOC_64K
nuclear@26 143 if (size > (png_uint_32)65536L)
nuclear@26 144 {
nuclear@26 145 png_warning(png_ptr, "Cannot Allocate > 64K");
nuclear@26 146 ret = NULL;
nuclear@26 147 }
nuclear@26 148 else
nuclear@26 149 #endif
nuclear@26 150
nuclear@26 151 if (size != (size_t)size)
nuclear@26 152 ret = NULL;
nuclear@26 153 else if (size == (png_uint_32)65536L)
nuclear@26 154 {
nuclear@26 155 if (png_ptr->offset_table == NULL)
nuclear@26 156 {
nuclear@26 157 /* try to see if we need to do any of this fancy stuff */
nuclear@26 158 ret = farmalloc(size);
nuclear@26 159 if (ret == NULL || ((png_size_t)ret & 0xffff))
nuclear@26 160 {
nuclear@26 161 int num_blocks;
nuclear@26 162 png_uint_32 total_size;
nuclear@26 163 png_bytep table;
nuclear@26 164 int i;
nuclear@26 165 png_byte huge * hptr;
nuclear@26 166
nuclear@26 167 if (ret != NULL)
nuclear@26 168 {
nuclear@26 169 farfree(ret);
nuclear@26 170 ret = NULL;
nuclear@26 171 }
nuclear@26 172
nuclear@26 173 if (png_ptr->zlib_window_bits > 14)
nuclear@26 174 num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
nuclear@26 175 else
nuclear@26 176 num_blocks = 1;
nuclear@26 177 if (png_ptr->zlib_mem_level >= 7)
nuclear@26 178 num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
nuclear@26 179 else
nuclear@26 180 num_blocks++;
nuclear@26 181
nuclear@26 182 total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
nuclear@26 183
nuclear@26 184 table = farmalloc(total_size);
nuclear@26 185
nuclear@26 186 if (table == NULL)
nuclear@26 187 {
nuclear@26 188 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 189 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 190 png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
nuclear@26 191 else
nuclear@26 192 png_warning(png_ptr, "Out Of Memory.");
nuclear@26 193 #endif
nuclear@26 194 return (NULL);
nuclear@26 195 }
nuclear@26 196
nuclear@26 197 if ((png_size_t)table & 0xfff0)
nuclear@26 198 {
nuclear@26 199 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 200 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 201 png_error(png_ptr,
nuclear@26 202 "Farmalloc didn't return normalized pointer");
nuclear@26 203 else
nuclear@26 204 png_warning(png_ptr,
nuclear@26 205 "Farmalloc didn't return normalized pointer");
nuclear@26 206 #endif
nuclear@26 207 return (NULL);
nuclear@26 208 }
nuclear@26 209
nuclear@26 210 png_ptr->offset_table = table;
nuclear@26 211 png_ptr->offset_table_ptr = farmalloc(num_blocks *
nuclear@26 212 png_sizeof(png_bytep));
nuclear@26 213
nuclear@26 214 if (png_ptr->offset_table_ptr == NULL)
nuclear@26 215 {
nuclear@26 216 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 217 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 218 png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
nuclear@26 219 else
nuclear@26 220 png_warning(png_ptr, "Out Of memory.");
nuclear@26 221 #endif
nuclear@26 222 return (NULL);
nuclear@26 223 }
nuclear@26 224
nuclear@26 225 hptr = (png_byte huge *)table;
nuclear@26 226 if ((png_size_t)hptr & 0xf)
nuclear@26 227 {
nuclear@26 228 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
nuclear@26 229 hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
nuclear@26 230 }
nuclear@26 231 for (i = 0; i < num_blocks; i++)
nuclear@26 232 {
nuclear@26 233 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
nuclear@26 234 hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
nuclear@26 235 }
nuclear@26 236
nuclear@26 237 png_ptr->offset_table_number = num_blocks;
nuclear@26 238 png_ptr->offset_table_count = 0;
nuclear@26 239 png_ptr->offset_table_count_free = 0;
nuclear@26 240 }
nuclear@26 241 }
nuclear@26 242
nuclear@26 243 if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
nuclear@26 244 {
nuclear@26 245 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 246 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 247 png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
nuclear@26 248 else
nuclear@26 249 png_warning(png_ptr, "Out of Memory.");
nuclear@26 250 #endif
nuclear@26 251 return (NULL);
nuclear@26 252 }
nuclear@26 253
nuclear@26 254 ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
nuclear@26 255 }
nuclear@26 256 else
nuclear@26 257 ret = farmalloc(size);
nuclear@26 258
nuclear@26 259 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 260 if (ret == NULL)
nuclear@26 261 {
nuclear@26 262 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 263 png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@26 264 else
nuclear@26 265 png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@26 266 }
nuclear@26 267 #endif
nuclear@26 268
nuclear@26 269 return (ret);
nuclear@26 270 }
nuclear@26 271
nuclear@26 272 /* free a pointer allocated by png_malloc(). In the default
nuclear@26 273 configuration, png_ptr is not used, but is passed in case it
nuclear@26 274 is needed. If ptr is NULL, return without taking any action. */
nuclear@26 275
nuclear@26 276 void PNGAPI
nuclear@26 277 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@26 278 {
nuclear@26 279 if (png_ptr == NULL || ptr == NULL)
nuclear@26 280 return;
nuclear@26 281
nuclear@26 282 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 283 if (png_ptr->free_fn != NULL)
nuclear@26 284 {
nuclear@26 285 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@26 286 return;
nuclear@26 287 }
nuclear@26 288 else png_free_default(png_ptr, ptr);
nuclear@26 289 }
nuclear@26 290
nuclear@26 291 void PNGAPI
nuclear@26 292 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@26 293 {
nuclear@26 294 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 295
nuclear@26 296 if (png_ptr == NULL || ptr == NULL) return;
nuclear@26 297
nuclear@26 298 if (png_ptr->offset_table != NULL)
nuclear@26 299 {
nuclear@26 300 int i;
nuclear@26 301
nuclear@26 302 for (i = 0; i < png_ptr->offset_table_count; i++)
nuclear@26 303 {
nuclear@26 304 if (ptr == png_ptr->offset_table_ptr[i])
nuclear@26 305 {
nuclear@26 306 ptr = NULL;
nuclear@26 307 png_ptr->offset_table_count_free++;
nuclear@26 308 break;
nuclear@26 309 }
nuclear@26 310 }
nuclear@26 311 if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
nuclear@26 312 {
nuclear@26 313 farfree(png_ptr->offset_table);
nuclear@26 314 farfree(png_ptr->offset_table_ptr);
nuclear@26 315 png_ptr->offset_table = NULL;
nuclear@26 316 png_ptr->offset_table_ptr = NULL;
nuclear@26 317 }
nuclear@26 318 }
nuclear@26 319
nuclear@26 320 if (ptr != NULL)
nuclear@26 321 {
nuclear@26 322 farfree(ptr);
nuclear@26 323 }
nuclear@26 324 }
nuclear@26 325
nuclear@26 326 #else /* Not the Borland DOS special memory handler */
nuclear@26 327
nuclear@26 328 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@26 329 memset can be replaced by a single call to calloc() if this is thought
nuclear@26 330 to improve performance noticably. */
nuclear@26 331 png_voidp /* PRIVATE */
nuclear@26 332 png_create_struct(int type)
nuclear@26 333 {
nuclear@26 334 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 335 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@26 336 }
nuclear@26 337
nuclear@26 338 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@26 339 memset can be replaced by a single call to calloc() if this is thought
nuclear@26 340 to improve performance noticably. */
nuclear@26 341 png_voidp /* PRIVATE */
nuclear@26 342 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@26 343 {
nuclear@26 344 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 345 png_size_t size;
nuclear@26 346 png_voidp struct_ptr;
nuclear@26 347
nuclear@26 348 if (type == PNG_STRUCT_INFO)
nuclear@26 349 size = png_sizeof(png_info);
nuclear@26 350 else if (type == PNG_STRUCT_PNG)
nuclear@26 351 size = png_sizeof(png_struct);
nuclear@26 352 else
nuclear@26 353 return (NULL);
nuclear@26 354
nuclear@26 355 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 356 if (malloc_fn != NULL)
nuclear@26 357 {
nuclear@26 358 png_struct dummy_struct;
nuclear@26 359 png_structp png_ptr = &dummy_struct;
nuclear@26 360 png_ptr->mem_ptr=mem_ptr;
nuclear@26 361 struct_ptr = (*(malloc_fn))(png_ptr, size);
nuclear@26 362 if (struct_ptr != NULL)
nuclear@26 363 png_memset(struct_ptr, 0, size);
nuclear@26 364 return (struct_ptr);
nuclear@26 365 }
nuclear@26 366 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 367
nuclear@26 368 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@26 369 struct_ptr = (png_voidp)farmalloc(size);
nuclear@26 370 #else
nuclear@26 371 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@26 372 struct_ptr = (png_voidp)halloc(size, 1);
nuclear@26 373 # else
nuclear@26 374 struct_ptr = (png_voidp)malloc(size);
nuclear@26 375 # endif
nuclear@26 376 #endif
nuclear@26 377 if (struct_ptr != NULL)
nuclear@26 378 png_memset(struct_ptr, 0, size);
nuclear@26 379
nuclear@26 380 return (struct_ptr);
nuclear@26 381 }
nuclear@26 382
nuclear@26 383
nuclear@26 384 /* Free memory allocated by a png_create_struct() call */
nuclear@26 385 void /* PRIVATE */
nuclear@26 386 png_destroy_struct(png_voidp struct_ptr)
nuclear@26 387 {
nuclear@26 388 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 389 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@26 390 }
nuclear@26 391
nuclear@26 392 /* Free memory allocated by a png_create_struct() call */
nuclear@26 393 void /* PRIVATE */
nuclear@26 394 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@26 395 png_voidp mem_ptr)
nuclear@26 396 {
nuclear@26 397 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 398 if (struct_ptr != NULL)
nuclear@26 399 {
nuclear@26 400 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 401 if (free_fn != NULL)
nuclear@26 402 {
nuclear@26 403 png_struct dummy_struct;
nuclear@26 404 png_structp png_ptr = &dummy_struct;
nuclear@26 405 png_ptr->mem_ptr=mem_ptr;
nuclear@26 406 (*(free_fn))(png_ptr, struct_ptr);
nuclear@26 407 return;
nuclear@26 408 }
nuclear@26 409 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 410 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@26 411 farfree(struct_ptr);
nuclear@26 412 #else
nuclear@26 413 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@26 414 hfree(struct_ptr);
nuclear@26 415 # else
nuclear@26 416 free(struct_ptr);
nuclear@26 417 # endif
nuclear@26 418 #endif
nuclear@26 419 }
nuclear@26 420 }
nuclear@26 421
nuclear@26 422 /* Allocate memory. For reasonable files, size should never exceed
nuclear@26 423 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@26 424 it not to. See zconf.h and png.h for more information. zlib does
nuclear@26 425 need to allocate exactly 64K, so whatever you call here must
nuclear@26 426 have the ability to do that. */
nuclear@26 427
nuclear@26 428 png_voidp PNGAPI
nuclear@26 429 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@26 430 {
nuclear@26 431 png_voidp ret;
nuclear@26 432
nuclear@26 433 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 434 if (png_ptr == NULL || size == 0)
nuclear@26 435 return (NULL);
nuclear@26 436
nuclear@26 437 if (png_ptr->malloc_fn != NULL)
nuclear@26 438 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@26 439 else
nuclear@26 440 ret = (png_malloc_default(png_ptr, size));
nuclear@26 441 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 442 png_error(png_ptr, "Out of Memory!");
nuclear@26 443 return (ret);
nuclear@26 444 }
nuclear@26 445
nuclear@26 446 png_voidp PNGAPI
nuclear@26 447 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@26 448 {
nuclear@26 449 png_voidp ret;
nuclear@26 450 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 451
nuclear@26 452 if (png_ptr == NULL || size == 0)
nuclear@26 453 return (NULL);
nuclear@26 454
nuclear@26 455 #ifdef PNG_MAX_MALLOC_64K
nuclear@26 456 if (size > (png_uint_32)65536L)
nuclear@26 457 {
nuclear@26 458 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 459 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 460 png_error(png_ptr, "Cannot Allocate > 64K");
nuclear@26 461 else
nuclear@26 462 #endif
nuclear@26 463 return NULL;
nuclear@26 464 }
nuclear@26 465 #endif
nuclear@26 466
nuclear@26 467 /* Check for overflow */
nuclear@26 468 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@26 469 if (size != (unsigned long)size)
nuclear@26 470 ret = NULL;
nuclear@26 471 else
nuclear@26 472 ret = farmalloc(size);
nuclear@26 473 #else
nuclear@26 474 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@26 475 if (size != (unsigned long)size)
nuclear@26 476 ret = NULL;
nuclear@26 477 else
nuclear@26 478 ret = halloc(size, 1);
nuclear@26 479 # else
nuclear@26 480 if (size != (size_t)size)
nuclear@26 481 ret = NULL;
nuclear@26 482 else
nuclear@26 483 ret = malloc((size_t)size);
nuclear@26 484 # endif
nuclear@26 485 #endif
nuclear@26 486
nuclear@26 487 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@26 488 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@26 489 png_error(png_ptr, "Out of Memory");
nuclear@26 490 #endif
nuclear@26 491
nuclear@26 492 return (ret);
nuclear@26 493 }
nuclear@26 494
nuclear@26 495 /* Free a pointer allocated by png_malloc(). If ptr is NULL, return
nuclear@26 496 without taking any action. */
nuclear@26 497 void PNGAPI
nuclear@26 498 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@26 499 {
nuclear@26 500 if (png_ptr == NULL || ptr == NULL)
nuclear@26 501 return;
nuclear@26 502
nuclear@26 503 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 504 if (png_ptr->free_fn != NULL)
nuclear@26 505 {
nuclear@26 506 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@26 507 return;
nuclear@26 508 }
nuclear@26 509 else png_free_default(png_ptr, ptr);
nuclear@26 510 }
nuclear@26 511 void PNGAPI
nuclear@26 512 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@26 513 {
nuclear@26 514 if (png_ptr == NULL || ptr == NULL)
nuclear@26 515 return;
nuclear@26 516
nuclear@26 517 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 518
nuclear@26 519 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@26 520 farfree(ptr);
nuclear@26 521 #else
nuclear@26 522 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@26 523 hfree(ptr);
nuclear@26 524 # else
nuclear@26 525 free(ptr);
nuclear@26 526 # endif
nuclear@26 527 #endif
nuclear@26 528 }
nuclear@26 529
nuclear@26 530 #endif /* Not Borland DOS special memory handler */
nuclear@26 531
nuclear@26 532 #if defined(PNG_1_0_X)
nuclear@26 533 # define png_malloc_warn png_malloc
nuclear@26 534 #else
nuclear@26 535 /* This function was added at libpng version 1.2.3. The png_malloc_warn()
nuclear@26 536 * function will set up png_malloc() to issue a png_warning and return NULL
nuclear@26 537 * instead of issuing a png_error, if it fails to allocate the requested
nuclear@26 538 * memory.
nuclear@26 539 */
nuclear@26 540 png_voidp PNGAPI
nuclear@26 541 png_malloc_warn(png_structp png_ptr, png_uint_32 size)
nuclear@26 542 {
nuclear@26 543 png_voidp ptr;
nuclear@26 544 png_uint_32 save_flags;
nuclear@26 545 if (png_ptr == NULL) return (NULL);
nuclear@26 546
nuclear@26 547 save_flags = png_ptr->flags;
nuclear@26 548 png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
nuclear@26 549 ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
nuclear@26 550 png_ptr->flags=save_flags;
nuclear@26 551 return(ptr);
nuclear@26 552 }
nuclear@26 553 #endif
nuclear@26 554
nuclear@26 555 png_voidp PNGAPI
nuclear@26 556 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
nuclear@26 557 png_uint_32 length)
nuclear@26 558 {
nuclear@26 559 png_size_t size;
nuclear@26 560
nuclear@26 561 size = (png_size_t)length;
nuclear@26 562 if ((png_uint_32)size != length)
nuclear@26 563 png_error(png_ptr, "Overflow in png_memcpy_check.");
nuclear@26 564
nuclear@26 565 return(png_memcpy (s1, s2, size));
nuclear@26 566 }
nuclear@26 567
nuclear@26 568 png_voidp PNGAPI
nuclear@26 569 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
nuclear@26 570 png_uint_32 length)
nuclear@26 571 {
nuclear@26 572 png_size_t size;
nuclear@26 573
nuclear@26 574 size = (png_size_t)length;
nuclear@26 575 if ((png_uint_32)size != length)
nuclear@26 576 png_error(png_ptr, "Overflow in png_memset_check.");
nuclear@26 577
nuclear@26 578 return (png_memset (s1, value, size));
nuclear@26 579
nuclear@26 580 }
nuclear@26 581
nuclear@26 582 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 583 /* This function is called when the application wants to use another method
nuclear@26 584 * of allocating and freeing memory.
nuclear@26 585 */
nuclear@26 586 void PNGAPI
nuclear@26 587 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
nuclear@26 588 malloc_fn, png_free_ptr free_fn)
nuclear@26 589 {
nuclear@26 590 if (png_ptr != NULL)
nuclear@26 591 {
nuclear@26 592 png_ptr->mem_ptr = mem_ptr;
nuclear@26 593 png_ptr->malloc_fn = malloc_fn;
nuclear@26 594 png_ptr->free_fn = free_fn;
nuclear@26 595 }
nuclear@26 596 }
nuclear@26 597
nuclear@26 598 /* This function returns a pointer to the mem_ptr associated with the user
nuclear@26 599 * functions. The application should free any memory associated with this
nuclear@26 600 * pointer before png_write_destroy and png_read_destroy are called.
nuclear@26 601 */
nuclear@26 602 png_voidp PNGAPI
nuclear@26 603 png_get_mem_ptr(png_structp png_ptr)
nuclear@26 604 {
nuclear@26 605 if (png_ptr == NULL) return (NULL);
nuclear@26 606 return ((png_voidp)png_ptr->mem_ptr);
nuclear@26 607 }
nuclear@26 608 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 609 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */