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annotate libs/libpng/pngmem.c @ 27:3d082c566b53

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fixed all the bugs, pc version works
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 18 Jun 2015 04:32:25 +0300
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rev   line source
nuclear@14 1
nuclear@14 2 /* pngmem.c - stub functions for memory allocation
nuclear@14 3 *
nuclear@14 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@14 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@14 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14 9 *
nuclear@14 10 * This file provides a location for all memory allocation. Users who
nuclear@14 11 * need special memory handling are expected to supply replacement
nuclear@14 12 * functions for png_malloc() and png_free(), and to use
nuclear@14 13 * png_create_read_struct_2() and png_create_write_struct_2() to
nuclear@14 14 * identify the replacement functions.
nuclear@14 15 */
nuclear@14 16
nuclear@14 17 #define PNG_INTERNAL
nuclear@14 18 #include "png.h"
nuclear@14 19 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@14 20
nuclear@14 21 /* Borland DOS special memory handler */
nuclear@14 22 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@14 23 /* if you change this, be sure to change the one in png.h also */
nuclear@14 24
nuclear@14 25 /* Allocate memory for a png_struct. The malloc and memset can be replaced
nuclear@14 26 by a single call to calloc() if this is thought to improve performance. */
nuclear@14 27 png_voidp /* PRIVATE */
nuclear@14 28 png_create_struct(int type)
nuclear@14 29 {
nuclear@14 30 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 31 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@14 32 }
nuclear@14 33
nuclear@14 34 /* Alternate version of png_create_struct, for use with user-defined malloc. */
nuclear@14 35 png_voidp /* PRIVATE */
nuclear@14 36 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@14 37 {
nuclear@14 38 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 39 png_size_t size;
nuclear@14 40 png_voidp struct_ptr;
nuclear@14 41
nuclear@14 42 if (type == PNG_STRUCT_INFO)
nuclear@14 43 size = png_sizeof(png_info);
nuclear@14 44 else if (type == PNG_STRUCT_PNG)
nuclear@14 45 size = png_sizeof(png_struct);
nuclear@14 46 else
nuclear@14 47 return (png_get_copyright(NULL));
nuclear@14 48
nuclear@14 49 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 50 if (malloc_fn != NULL)
nuclear@14 51 {
nuclear@14 52 png_struct dummy_struct;
nuclear@14 53 png_structp png_ptr = &dummy_struct;
nuclear@14 54 png_ptr->mem_ptr=mem_ptr;
nuclear@14 55 struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
nuclear@14 56 }
nuclear@14 57 else
nuclear@14 58 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 59 struct_ptr = (png_voidp)farmalloc(size);
nuclear@14 60 if (struct_ptr != NULL)
nuclear@14 61 png_memset(struct_ptr, 0, size);
nuclear@14 62 return (struct_ptr);
nuclear@14 63 }
nuclear@14 64
nuclear@14 65 /* Free memory allocated by a png_create_struct() call */
nuclear@14 66 void /* PRIVATE */
nuclear@14 67 png_destroy_struct(png_voidp struct_ptr)
nuclear@14 68 {
nuclear@14 69 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 70 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@14 71 }
nuclear@14 72
nuclear@14 73 /* Free memory allocated by a png_create_struct() call */
nuclear@14 74 void /* PRIVATE */
nuclear@14 75 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@14 76 png_voidp mem_ptr)
nuclear@14 77 {
nuclear@14 78 #endif
nuclear@14 79 if (struct_ptr != NULL)
nuclear@14 80 {
nuclear@14 81 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 82 if (free_fn != NULL)
nuclear@14 83 {
nuclear@14 84 png_struct dummy_struct;
nuclear@14 85 png_structp png_ptr = &dummy_struct;
nuclear@14 86 png_ptr->mem_ptr=mem_ptr;
nuclear@14 87 (*(free_fn))(png_ptr, struct_ptr);
nuclear@14 88 return;
nuclear@14 89 }
nuclear@14 90 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 91 farfree (struct_ptr);
nuclear@14 92 }
nuclear@14 93 }
nuclear@14 94
nuclear@14 95 /* Allocate memory. For reasonable files, size should never exceed
nuclear@14 96 * 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@14 97 * it not to. See zconf.h and png.h for more information. zlib does
nuclear@14 98 * need to allocate exactly 64K, so whatever you call here must
nuclear@14 99 * have the ability to do that.
nuclear@14 100 *
nuclear@14 101 * Borland seems to have a problem in DOS mode for exactly 64K.
nuclear@14 102 * It gives you a segment with an offset of 8 (perhaps to store its
nuclear@14 103 * memory stuff). zlib doesn't like this at all, so we have to
nuclear@14 104 * detect and deal with it. This code should not be needed in
nuclear@14 105 * Windows or OS/2 modes, and only in 16 bit mode. This code has
nuclear@14 106 * been updated by Alexander Lehmann for version 0.89 to waste less
nuclear@14 107 * memory.
nuclear@14 108 *
nuclear@14 109 * Note that we can't use png_size_t for the "size" declaration,
nuclear@14 110 * since on some systems a png_size_t is a 16-bit quantity, and as a
nuclear@14 111 * result, we would be truncating potentially larger memory requests
nuclear@14 112 * (which should cause a fatal error) and introducing major problems.
nuclear@14 113 */
nuclear@14 114
nuclear@14 115 png_voidp PNGAPI
nuclear@14 116 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@14 117 {
nuclear@14 118 png_voidp ret;
nuclear@14 119
nuclear@14 120 if (png_ptr == NULL || size == 0)
nuclear@14 121 return (NULL);
nuclear@14 122
nuclear@14 123 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 124 if (png_ptr->malloc_fn != NULL)
nuclear@14 125 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@14 126 else
nuclear@14 127 ret = (png_malloc_default(png_ptr, size));
nuclear@14 128 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 129 png_error(png_ptr, "Out of memory!");
nuclear@14 130 return (ret);
nuclear@14 131 }
nuclear@14 132
nuclear@14 133 png_voidp PNGAPI
nuclear@14 134 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@14 135 {
nuclear@14 136 png_voidp ret;
nuclear@14 137 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 138
nuclear@14 139 if (png_ptr == NULL || size == 0)
nuclear@14 140 return (NULL);
nuclear@14 141
nuclear@14 142 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 143 if (size > (png_uint_32)65536L)
nuclear@14 144 {
nuclear@14 145 png_warning(png_ptr, "Cannot Allocate > 64K");
nuclear@14 146 ret = NULL;
nuclear@14 147 }
nuclear@14 148 else
nuclear@14 149 #endif
nuclear@14 150
nuclear@14 151 if (size != (size_t)size)
nuclear@14 152 ret = NULL;
nuclear@14 153 else if (size == (png_uint_32)65536L)
nuclear@14 154 {
nuclear@14 155 if (png_ptr->offset_table == NULL)
nuclear@14 156 {
nuclear@14 157 /* try to see if we need to do any of this fancy stuff */
nuclear@14 158 ret = farmalloc(size);
nuclear@14 159 if (ret == NULL || ((png_size_t)ret & 0xffff))
nuclear@14 160 {
nuclear@14 161 int num_blocks;
nuclear@14 162 png_uint_32 total_size;
nuclear@14 163 png_bytep table;
nuclear@14 164 int i;
nuclear@14 165 png_byte huge * hptr;
nuclear@14 166
nuclear@14 167 if (ret != NULL)
nuclear@14 168 {
nuclear@14 169 farfree(ret);
nuclear@14 170 ret = NULL;
nuclear@14 171 }
nuclear@14 172
nuclear@14 173 if (png_ptr->zlib_window_bits > 14)
nuclear@14 174 num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
nuclear@14 175 else
nuclear@14 176 num_blocks = 1;
nuclear@14 177 if (png_ptr->zlib_mem_level >= 7)
nuclear@14 178 num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
nuclear@14 179 else
nuclear@14 180 num_blocks++;
nuclear@14 181
nuclear@14 182 total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
nuclear@14 183
nuclear@14 184 table = farmalloc(total_size);
nuclear@14 185
nuclear@14 186 if (table == NULL)
nuclear@14 187 {
nuclear@14 188 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 189 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 190 png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
nuclear@14 191 else
nuclear@14 192 png_warning(png_ptr, "Out Of Memory.");
nuclear@14 193 #endif
nuclear@14 194 return (NULL);
nuclear@14 195 }
nuclear@14 196
nuclear@14 197 if ((png_size_t)table & 0xfff0)
nuclear@14 198 {
nuclear@14 199 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 200 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 201 png_error(png_ptr,
nuclear@14 202 "Farmalloc didn't return normalized pointer");
nuclear@14 203 else
nuclear@14 204 png_warning(png_ptr,
nuclear@14 205 "Farmalloc didn't return normalized pointer");
nuclear@14 206 #endif
nuclear@14 207 return (NULL);
nuclear@14 208 }
nuclear@14 209
nuclear@14 210 png_ptr->offset_table = table;
nuclear@14 211 png_ptr->offset_table_ptr = farmalloc(num_blocks *
nuclear@14 212 png_sizeof(png_bytep));
nuclear@14 213
nuclear@14 214 if (png_ptr->offset_table_ptr == NULL)
nuclear@14 215 {
nuclear@14 216 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 217 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 218 png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
nuclear@14 219 else
nuclear@14 220 png_warning(png_ptr, "Out Of memory.");
nuclear@14 221 #endif
nuclear@14 222 return (NULL);
nuclear@14 223 }
nuclear@14 224
nuclear@14 225 hptr = (png_byte huge *)table;
nuclear@14 226 if ((png_size_t)hptr & 0xf)
nuclear@14 227 {
nuclear@14 228 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
nuclear@14 229 hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
nuclear@14 230 }
nuclear@14 231 for (i = 0; i < num_blocks; i++)
nuclear@14 232 {
nuclear@14 233 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
nuclear@14 234 hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
nuclear@14 235 }
nuclear@14 236
nuclear@14 237 png_ptr->offset_table_number = num_blocks;
nuclear@14 238 png_ptr->offset_table_count = 0;
nuclear@14 239 png_ptr->offset_table_count_free = 0;
nuclear@14 240 }
nuclear@14 241 }
nuclear@14 242
nuclear@14 243 if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
nuclear@14 244 {
nuclear@14 245 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 246 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 247 png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
nuclear@14 248 else
nuclear@14 249 png_warning(png_ptr, "Out of Memory.");
nuclear@14 250 #endif
nuclear@14 251 return (NULL);
nuclear@14 252 }
nuclear@14 253
nuclear@14 254 ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
nuclear@14 255 }
nuclear@14 256 else
nuclear@14 257 ret = farmalloc(size);
nuclear@14 258
nuclear@14 259 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 260 if (ret == NULL)
nuclear@14 261 {
nuclear@14 262 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 263 png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@14 264 else
nuclear@14 265 png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
nuclear@14 266 }
nuclear@14 267 #endif
nuclear@14 268
nuclear@14 269 return (ret);
nuclear@14 270 }
nuclear@14 271
nuclear@14 272 /* free a pointer allocated by png_malloc(). In the default
nuclear@14 273 configuration, png_ptr is not used, but is passed in case it
nuclear@14 274 is needed. If ptr is NULL, return without taking any action. */
nuclear@14 275
nuclear@14 276 void PNGAPI
nuclear@14 277 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@14 278 {
nuclear@14 279 if (png_ptr == NULL || ptr == NULL)
nuclear@14 280 return;
nuclear@14 281
nuclear@14 282 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 283 if (png_ptr->free_fn != NULL)
nuclear@14 284 {
nuclear@14 285 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@14 286 return;
nuclear@14 287 }
nuclear@14 288 else png_free_default(png_ptr, ptr);
nuclear@14 289 }
nuclear@14 290
nuclear@14 291 void PNGAPI
nuclear@14 292 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@14 293 {
nuclear@14 294 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 295
nuclear@14 296 if (png_ptr == NULL || ptr == NULL) return;
nuclear@14 297
nuclear@14 298 if (png_ptr->offset_table != NULL)
nuclear@14 299 {
nuclear@14 300 int i;
nuclear@14 301
nuclear@14 302 for (i = 0; i < png_ptr->offset_table_count; i++)
nuclear@14 303 {
nuclear@14 304 if (ptr == png_ptr->offset_table_ptr[i])
nuclear@14 305 {
nuclear@14 306 ptr = NULL;
nuclear@14 307 png_ptr->offset_table_count_free++;
nuclear@14 308 break;
nuclear@14 309 }
nuclear@14 310 }
nuclear@14 311 if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
nuclear@14 312 {
nuclear@14 313 farfree(png_ptr->offset_table);
nuclear@14 314 farfree(png_ptr->offset_table_ptr);
nuclear@14 315 png_ptr->offset_table = NULL;
nuclear@14 316 png_ptr->offset_table_ptr = NULL;
nuclear@14 317 }
nuclear@14 318 }
nuclear@14 319
nuclear@14 320 if (ptr != NULL)
nuclear@14 321 {
nuclear@14 322 farfree(ptr);
nuclear@14 323 }
nuclear@14 324 }
nuclear@14 325
nuclear@14 326 #else /* Not the Borland DOS special memory handler */
nuclear@14 327
nuclear@14 328 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@14 329 memset can be replaced by a single call to calloc() if this is thought
nuclear@14 330 to improve performance noticably. */
nuclear@14 331 png_voidp /* PRIVATE */
nuclear@14 332 png_create_struct(int type)
nuclear@14 333 {
nuclear@14 334 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 335 return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
nuclear@14 336 }
nuclear@14 337
nuclear@14 338 /* Allocate memory for a png_struct or a png_info. The malloc and
nuclear@14 339 memset can be replaced by a single call to calloc() if this is thought
nuclear@14 340 to improve performance noticably. */
nuclear@14 341 png_voidp /* PRIVATE */
nuclear@14 342 png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
nuclear@14 343 {
nuclear@14 344 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 345 png_size_t size;
nuclear@14 346 png_voidp struct_ptr;
nuclear@14 347
nuclear@14 348 if (type == PNG_STRUCT_INFO)
nuclear@14 349 size = png_sizeof(png_info);
nuclear@14 350 else if (type == PNG_STRUCT_PNG)
nuclear@14 351 size = png_sizeof(png_struct);
nuclear@14 352 else
nuclear@14 353 return (NULL);
nuclear@14 354
nuclear@14 355 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 356 if (malloc_fn != NULL)
nuclear@14 357 {
nuclear@14 358 png_struct dummy_struct;
nuclear@14 359 png_structp png_ptr = &dummy_struct;
nuclear@14 360 png_ptr->mem_ptr=mem_ptr;
nuclear@14 361 struct_ptr = (*(malloc_fn))(png_ptr, size);
nuclear@14 362 if (struct_ptr != NULL)
nuclear@14 363 png_memset(struct_ptr, 0, size);
nuclear@14 364 return (struct_ptr);
nuclear@14 365 }
nuclear@14 366 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 367
nuclear@14 368 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@14 369 struct_ptr = (png_voidp)farmalloc(size);
nuclear@14 370 #else
nuclear@14 371 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@14 372 struct_ptr = (png_voidp)halloc(size, 1);
nuclear@14 373 # else
nuclear@14 374 struct_ptr = (png_voidp)malloc(size);
nuclear@14 375 # endif
nuclear@14 376 #endif
nuclear@14 377 if (struct_ptr != NULL)
nuclear@14 378 png_memset(struct_ptr, 0, size);
nuclear@14 379
nuclear@14 380 return (struct_ptr);
nuclear@14 381 }
nuclear@14 382
nuclear@14 383
nuclear@14 384 /* Free memory allocated by a png_create_struct() call */
nuclear@14 385 void /* PRIVATE */
nuclear@14 386 png_destroy_struct(png_voidp struct_ptr)
nuclear@14 387 {
nuclear@14 388 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 389 png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
nuclear@14 390 }
nuclear@14 391
nuclear@14 392 /* Free memory allocated by a png_create_struct() call */
nuclear@14 393 void /* PRIVATE */
nuclear@14 394 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
nuclear@14 395 png_voidp mem_ptr)
nuclear@14 396 {
nuclear@14 397 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 398 if (struct_ptr != NULL)
nuclear@14 399 {
nuclear@14 400 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 401 if (free_fn != NULL)
nuclear@14 402 {
nuclear@14 403 png_struct dummy_struct;
nuclear@14 404 png_structp png_ptr = &dummy_struct;
nuclear@14 405 png_ptr->mem_ptr=mem_ptr;
nuclear@14 406 (*(free_fn))(png_ptr, struct_ptr);
nuclear@14 407 return;
nuclear@14 408 }
nuclear@14 409 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 410 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@14 411 farfree(struct_ptr);
nuclear@14 412 #else
nuclear@14 413 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@14 414 hfree(struct_ptr);
nuclear@14 415 # else
nuclear@14 416 free(struct_ptr);
nuclear@14 417 # endif
nuclear@14 418 #endif
nuclear@14 419 }
nuclear@14 420 }
nuclear@14 421
nuclear@14 422 /* Allocate memory. For reasonable files, size should never exceed
nuclear@14 423 64K. However, zlib may allocate more then 64K if you don't tell
nuclear@14 424 it not to. See zconf.h and png.h for more information. zlib does
nuclear@14 425 need to allocate exactly 64K, so whatever you call here must
nuclear@14 426 have the ability to do that. */
nuclear@14 427
nuclear@14 428 png_voidp PNGAPI
nuclear@14 429 png_malloc(png_structp png_ptr, png_uint_32 size)
nuclear@14 430 {
nuclear@14 431 png_voidp ret;
nuclear@14 432
nuclear@14 433 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 434 if (png_ptr == NULL || size == 0)
nuclear@14 435 return (NULL);
nuclear@14 436
nuclear@14 437 if (png_ptr->malloc_fn != NULL)
nuclear@14 438 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
nuclear@14 439 else
nuclear@14 440 ret = (png_malloc_default(png_ptr, size));
nuclear@14 441 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 442 png_error(png_ptr, "Out of Memory!");
nuclear@14 443 return (ret);
nuclear@14 444 }
nuclear@14 445
nuclear@14 446 png_voidp PNGAPI
nuclear@14 447 png_malloc_default(png_structp png_ptr, png_uint_32 size)
nuclear@14 448 {
nuclear@14 449 png_voidp ret;
nuclear@14 450 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 451
nuclear@14 452 if (png_ptr == NULL || size == 0)
nuclear@14 453 return (NULL);
nuclear@14 454
nuclear@14 455 #ifdef PNG_MAX_MALLOC_64K
nuclear@14 456 if (size > (png_uint_32)65536L)
nuclear@14 457 {
nuclear@14 458 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 459 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 460 png_error(png_ptr, "Cannot Allocate > 64K");
nuclear@14 461 else
nuclear@14 462 #endif
nuclear@14 463 return NULL;
nuclear@14 464 }
nuclear@14 465 #endif
nuclear@14 466
nuclear@14 467 /* Check for overflow */
nuclear@14 468 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@14 469 if (size != (unsigned long)size)
nuclear@14 470 ret = NULL;
nuclear@14 471 else
nuclear@14 472 ret = farmalloc(size);
nuclear@14 473 #else
nuclear@14 474 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@14 475 if (size != (unsigned long)size)
nuclear@14 476 ret = NULL;
nuclear@14 477 else
nuclear@14 478 ret = halloc(size, 1);
nuclear@14 479 # else
nuclear@14 480 if (size != (size_t)size)
nuclear@14 481 ret = NULL;
nuclear@14 482 else
nuclear@14 483 ret = malloc((size_t)size);
nuclear@14 484 # endif
nuclear@14 485 #endif
nuclear@14 486
nuclear@14 487 #ifndef PNG_USER_MEM_SUPPORTED
nuclear@14 488 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
nuclear@14 489 png_error(png_ptr, "Out of Memory");
nuclear@14 490 #endif
nuclear@14 491
nuclear@14 492 return (ret);
nuclear@14 493 }
nuclear@14 494
nuclear@14 495 /* Free a pointer allocated by png_malloc(). If ptr is NULL, return
nuclear@14 496 without taking any action. */
nuclear@14 497 void PNGAPI
nuclear@14 498 png_free(png_structp png_ptr, png_voidp ptr)
nuclear@14 499 {
nuclear@14 500 if (png_ptr == NULL || ptr == NULL)
nuclear@14 501 return;
nuclear@14 502
nuclear@14 503 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 504 if (png_ptr->free_fn != NULL)
nuclear@14 505 {
nuclear@14 506 (*(png_ptr->free_fn))(png_ptr, ptr);
nuclear@14 507 return;
nuclear@14 508 }
nuclear@14 509 else png_free_default(png_ptr, ptr);
nuclear@14 510 }
nuclear@14 511 void PNGAPI
nuclear@14 512 png_free_default(png_structp png_ptr, png_voidp ptr)
nuclear@14 513 {
nuclear@14 514 if (png_ptr == NULL || ptr == NULL)
nuclear@14 515 return;
nuclear@14 516
nuclear@14 517 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 518
nuclear@14 519 #if defined(__TURBOC__) && !defined(__FLAT__)
nuclear@14 520 farfree(ptr);
nuclear@14 521 #else
nuclear@14 522 # if defined(_MSC_VER) && defined(MAXSEG_64K)
nuclear@14 523 hfree(ptr);
nuclear@14 524 # else
nuclear@14 525 free(ptr);
nuclear@14 526 # endif
nuclear@14 527 #endif
nuclear@14 528 }
nuclear@14 529
nuclear@14 530 #endif /* Not Borland DOS special memory handler */
nuclear@14 531
nuclear@14 532 #if defined(PNG_1_0_X)
nuclear@14 533 # define png_malloc_warn png_malloc
nuclear@14 534 #else
nuclear@14 535 /* This function was added at libpng version 1.2.3. The png_malloc_warn()
nuclear@14 536 * function will set up png_malloc() to issue a png_warning and return NULL
nuclear@14 537 * instead of issuing a png_error, if it fails to allocate the requested
nuclear@14 538 * memory.
nuclear@14 539 */
nuclear@14 540 png_voidp PNGAPI
nuclear@14 541 png_malloc_warn(png_structp png_ptr, png_uint_32 size)
nuclear@14 542 {
nuclear@14 543 png_voidp ptr;
nuclear@14 544 png_uint_32 save_flags;
nuclear@14 545 if (png_ptr == NULL) return (NULL);
nuclear@14 546
nuclear@14 547 save_flags = png_ptr->flags;
nuclear@14 548 png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
nuclear@14 549 ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
nuclear@14 550 png_ptr->flags=save_flags;
nuclear@14 551 return(ptr);
nuclear@14 552 }
nuclear@14 553 #endif
nuclear@14 554
nuclear@14 555 png_voidp PNGAPI
nuclear@14 556 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
nuclear@14 557 png_uint_32 length)
nuclear@14 558 {
nuclear@14 559 png_size_t size;
nuclear@14 560
nuclear@14 561 size = (png_size_t)length;
nuclear@14 562 if ((png_uint_32)size != length)
nuclear@14 563 png_error(png_ptr, "Overflow in png_memcpy_check.");
nuclear@14 564
nuclear@14 565 return(png_memcpy (s1, s2, size));
nuclear@14 566 }
nuclear@14 567
nuclear@14 568 png_voidp PNGAPI
nuclear@14 569 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
nuclear@14 570 png_uint_32 length)
nuclear@14 571 {
nuclear@14 572 png_size_t size;
nuclear@14 573
nuclear@14 574 size = (png_size_t)length;
nuclear@14 575 if ((png_uint_32)size != length)
nuclear@14 576 png_error(png_ptr, "Overflow in png_memset_check.");
nuclear@14 577
nuclear@14 578 return (png_memset (s1, value, size));
nuclear@14 579
nuclear@14 580 }
nuclear@14 581
nuclear@14 582 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14 583 /* This function is called when the application wants to use another method
nuclear@14 584 * of allocating and freeing memory.
nuclear@14 585 */
nuclear@14 586 void PNGAPI
nuclear@14 587 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
nuclear@14 588 malloc_fn, png_free_ptr free_fn)
nuclear@14 589 {
nuclear@14 590 if (png_ptr != NULL)
nuclear@14 591 {
nuclear@14 592 png_ptr->mem_ptr = mem_ptr;
nuclear@14 593 png_ptr->malloc_fn = malloc_fn;
nuclear@14 594 png_ptr->free_fn = free_fn;
nuclear@14 595 }
nuclear@14 596 }
nuclear@14 597
nuclear@14 598 /* This function returns a pointer to the mem_ptr associated with the user
nuclear@14 599 * functions. The application should free any memory associated with this
nuclear@14 600 * pointer before png_write_destroy and png_read_destroy are called.
nuclear@14 601 */
nuclear@14 602 png_voidp PNGAPI
nuclear@14 603 png_get_mem_ptr(png_structp png_ptr)
nuclear@14 604 {
nuclear@14 605 if (png_ptr == NULL) return (NULL);
nuclear@14 606 return ((png_voidp)png_ptr->mem_ptr);
nuclear@14 607 }
nuclear@14 608 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14 609 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */