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pngmem.c
Go to the documentation of this file.
1
2 /* pngmem.c - stub functions for memory allocation
3 *
4 * Last changed in libpng 1.5.1 [February 3, 2011]
5 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 *
13 * This file provides a location for all memory allocation. Users who
14 * need special memory handling are expected to supply replacement
15 * functions for png_malloc() and png_free(), and to use
16 * png_create_read_struct_2() and png_create_write_struct_2() to
17 * identify the replacement functions.
18 */
19
20 #include "pngpriv.h"
21
22 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
23
24 /* Borland DOS special memory handler */
25 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
26 /* If you change this, be sure to change the one in png.h also */
27
28 /* Allocate memory for a png_struct. The malloc and memset can be replaced
29 by a single call to calloc() if this is thought to improve performance. */
30 PNG_FUNCTION(png_voidp /* PRIVATE */,
31 png_create_struct,(int type),PNG_ALLOCATED)
32 {
33 # ifdef PNG_USER_MEM_SUPPORTED
34 return (png_create_struct_2(type, NULL, NULL));
35 }
36
37 /* Alternate version of png_create_struct, for use with user-defined malloc. */
38 PNG_FUNCTION(png_voidp /* PRIVATE */,
39 png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
40 PNG_ALLOCATED)
41 {
42 # endif /* PNG_USER_MEM_SUPPORTED */
43 png_size_t size;
44 png_voidp struct_ptr;
45
46 if (type == PNG_STRUCT_INFO)
47 size = png_sizeof(png_info);
48
49 else if (type == PNG_STRUCT_PNG)
50 size = png_sizeof(png_struct);
51
52 else
53 return (png_get_copyright(NULL));
54
55 # ifdef PNG_USER_MEM_SUPPORTED
56 if (malloc_fn != NULL)
57 {
58 png_struct dummy_struct;
59 png_structp png_ptr = &dummy_struct;
60 png_ptr->mem_ptr=mem_ptr;
61 struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
62 }
63
64 else
65 # endif /* PNG_USER_MEM_SUPPORTED */
66 struct_ptr = (png_voidp)farmalloc(size);
67 if (struct_ptr != NULL)
68 png_memset(struct_ptr, 0, size);
69
70 return (struct_ptr);
71 }
72
73 /* Free memory allocated by a png_create_struct() call */
74 void /* PRIVATE */
75 png_destroy_struct(png_voidp struct_ptr)
76 {
77 # ifdef PNG_USER_MEM_SUPPORTED
78 png_destroy_struct_2(struct_ptr, NULL, NULL);
79 }
80
81 /* Free memory allocated by a png_create_struct() call */
82 void /* PRIVATE */
83 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
84 png_voidp mem_ptr)
85 {
86 # endif
87 if (struct_ptr != NULL)
88 {
89 # ifdef PNG_USER_MEM_SUPPORTED
90 if (free_fn != NULL)
91 {
92 png_struct dummy_struct;
93 png_structp png_ptr = &dummy_struct;
94 png_ptr->mem_ptr=mem_ptr;
95 (*(free_fn))(png_ptr, struct_ptr);
96 return;
97 }
98
99 # endif /* PNG_USER_MEM_SUPPORTED */
100 farfree (struct_ptr);
101 }
102 }
103
104 /* Allocate memory. For reasonable files, size should never exceed
105 * 64K. However, zlib may allocate more then 64K if you don't tell
106 * it not to. See zconf.h and png.h for more information. zlib does
107 * need to allocate exactly 64K, so whatever you call here must
108 * have the ability to do that.
109 *
110 * Borland seems to have a problem in DOS mode for exactly 64K.
111 * It gives you a segment with an offset of 8 (perhaps to store its
112 * memory stuff). zlib doesn't like this at all, so we have to
113 * detect and deal with it. This code should not be needed in
114 * Windows or OS/2 modes, and only in 16 bit mode. This code has
115 * been updated by Alexander Lehmann for version 0.89 to waste less
116 * memory.
117 *
118 * Note that we can't use png_size_t for the "size" declaration,
119 * since on some systems a png_size_t is a 16-bit quantity, and as a
120 * result, we would be truncating potentially larger memory requests
121 * (which should cause a fatal error) and introducing major problems.
122 */
123 PNG_FUNCTION(png_voidp,PNGAPI
124 png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
125 {
126 png_voidp ret;
127
128 ret = (png_malloc(png_ptr, size));
129
130 if (ret != NULL)
131 png_memset(ret,0,(png_size_t)size);
132
133 return (ret);
134 }
135
136 PNG_FUNCTION(png_voidp,PNGAPI
137 png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
138 {
139 png_voidp ret;
140
141 if (png_ptr == NULL || size == 0)
142 return (NULL);
143
144 # ifdef PNG_USER_MEM_SUPPORTED
145 if (png_ptr->malloc_fn != NULL)
146 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
147
148 else
149 ret = (png_malloc_default(png_ptr, size));
150
151 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
152 png_error(png_ptr, "Out of memory");
153
154 return (ret);
155 }
156
157 PNG_FUNCTION(png_voidp,PNGAPI
158 png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
159 {
160 png_voidp ret;
161 # endif /* PNG_USER_MEM_SUPPORTED */
162
163 if (png_ptr == NULL || size == 0)
164 return (NULL);
165
166 # ifdef PNG_MAX_MALLOC_64K
167 if (size > (png_uint_32)65536L)
168 {
169 png_warning(png_ptr, "Cannot Allocate > 64K");
170 ret = NULL;
171 }
172
173 else
174 # endif
175
176 if (size != (size_t)size)
177 ret = NULL;
178
179 else if (size == (png_uint_32)65536L)
180 {
181 if (png_ptr->offset_table == NULL)
182 {
183 /* Try to see if we need to do any of this fancy stuff */
184 ret = farmalloc(size);
185 if (ret == NULL || ((png_size_t)ret & 0xffff))
186 {
187 int num_blocks;
188 png_uint_32 total_size;
189 png_bytep table;
190 int i;
191 png_byte huge * hptr;
192
193 if (ret != NULL)
194 {
195 farfree(ret);
196 ret = NULL;
197 }
198
199 if (png_ptr->zlib_window_bits > 14)
200 num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
201
202 else
203 num_blocks = 1;
204
205 if (png_ptr->zlib_mem_level >= 7)
206 num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
207
208 else
209 num_blocks++;
210
211 total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
212
213 table = farmalloc(total_size);
214
215 if (table == NULL)
216 {
217 # ifndef PNG_USER_MEM_SUPPORTED
218 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
219 png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
220
221 else
222 png_warning(png_ptr, "Out Of Memory");
223 # endif
224 return (NULL);
225 }
226
227 if ((png_size_t)table & 0xfff0)
228 {
229 # ifndef PNG_USER_MEM_SUPPORTED
230 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
231 png_error(png_ptr,
232 "Farmalloc didn't return normalized pointer");
233
234 else
235 png_warning(png_ptr,
236 "Farmalloc didn't return normalized pointer");
237 # endif
238 return (NULL);
239 }
240
241 png_ptr->offset_table = table;
242 png_ptr->offset_table_ptr = farmalloc(num_blocks *
243 png_sizeof(png_bytep));
244
245 if (png_ptr->offset_table_ptr == NULL)
246 {
247 # ifndef PNG_USER_MEM_SUPPORTED
248 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
249 png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
250
251 else
252 png_warning(png_ptr, "Out Of memory");
253 # endif
254 return (NULL);
255 }
256
257 hptr = (png_byte huge *)table;
258 if ((png_size_t)hptr & 0xf)
259 {
260 hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
261 hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
262 }
263
264 for (i = 0; i < num_blocks; i++)
265 {
266 png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
267 hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
268 }
269
270 png_ptr->offset_table_number = num_blocks;
271 png_ptr->offset_table_count = 0;
272 png_ptr->offset_table_count_free = 0;
273 }
274 }
275
276 if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
277 {
278 # ifndef PNG_USER_MEM_SUPPORTED
279 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
280 png_error(png_ptr, "Out of Memory"); /* Note "o" and "M" */
281
282 else
283 png_warning(png_ptr, "Out of Memory");
284 # endif
285 return (NULL);
286 }
287
288 ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
289 }
290
291 else
292 ret = farmalloc(size);
293
294 # ifndef PNG_USER_MEM_SUPPORTED
295 if (ret == NULL)
296 {
297 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
298 png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
299
300 else
301 png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
302 }
303 # endif
304
305 return (ret);
306 }
307
308 /* Free a pointer allocated by png_malloc(). In the default
309 * configuration, png_ptr is not used, but is passed in case it
310 * is needed. If ptr is NULL, return without taking any action.
311 */
312 void PNGAPI
313 png_free(png_structp png_ptr, png_voidp ptr)
314 {
315 if (png_ptr == NULL || ptr == NULL)
316 return;
317
318 # ifdef PNG_USER_MEM_SUPPORTED
319 if (png_ptr->free_fn != NULL)
320 {
321 (*(png_ptr->free_fn))(png_ptr, ptr);
322 return;
323 }
324
325 else
326 png_free_default(png_ptr, ptr);
327 }
328
329 void PNGAPI
330 png_free_default(png_structp png_ptr, png_voidp ptr)
331 {
332 # endif /* PNG_USER_MEM_SUPPORTED */
333
334 if (png_ptr == NULL || ptr == NULL)
335 return;
336
337 if (png_ptr->offset_table != NULL)
338 {
339 int i;
340
341 for (i = 0; i < png_ptr->offset_table_count; i++)
342 {
343 if (ptr == png_ptr->offset_table_ptr[i])
344 {
345 ptr = NULL;
346 png_ptr->offset_table_count_free++;
347 break;
348 }
349 }
350 if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
351 {
352 farfree(png_ptr->offset_table);
353 farfree(png_ptr->offset_table_ptr);
354 png_ptr->offset_table = NULL;
355 png_ptr->offset_table_ptr = NULL;
356 }
357 }
358
359 if (ptr != NULL)
360 farfree(ptr);
361 }
362
363 #else /* Not the Borland DOS special memory handler */
364
365 /* Allocate memory for a png_struct or a png_info. The malloc and
366 memset can be replaced by a single call to calloc() if this is thought
367 to improve performance noticably. */
368 PNG_FUNCTION(png_voidp /* PRIVATE */,
369 png_create_struct,(int type),PNG_ALLOCATED)
370 {
371 # ifdef PNG_USER_MEM_SUPPORTED
372 return (png_create_struct_2(type, NULL, NULL));
373 }
374
375 /* Allocate memory for a png_struct or a png_info. The malloc and
376 memset can be replaced by a single call to calloc() if this is thought
377 to improve performance noticably. */
378 PNG_FUNCTION(png_voidp /* PRIVATE */,
379 png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
380 PNG_ALLOCATED)
381 {
382 # endif /* PNG_USER_MEM_SUPPORTED */
383 png_size_t size;
384 png_voidp struct_ptr;
385
386 if (type == PNG_STRUCT_INFO)
387 size = png_sizeof(png_info);
388
389 else if (type == PNG_STRUCT_PNG)
390 size = png_sizeof(png_struct);
391
392 else
393 return (NULL);
394
395 # ifdef PNG_USER_MEM_SUPPORTED
396 if (malloc_fn != NULL)
397 {
398 png_struct dummy_struct;
399 png_structp png_ptr = &dummy_struct;
400 png_ptr->mem_ptr=mem_ptr;
401 struct_ptr = (*(malloc_fn))(png_ptr, size);
402
403 if (struct_ptr != NULL)
404 png_memset(struct_ptr, 0, size);
405
406 return (struct_ptr);
407 }
408 # endif /* PNG_USER_MEM_SUPPORTED */
409
410 # if defined(__TURBOC__) && !defined(__FLAT__)
411 struct_ptr = (png_voidp)farmalloc(size);
412 # else
413 # if defined(_MSC_VER) && defined(MAXSEG_64K)
414 struct_ptr = (png_voidp)halloc(size, 1);
415 # else
416 struct_ptr = (png_voidp)malloc(size);
417 # endif
418 # endif
419
420 if (struct_ptr != NULL)
421 png_memset(struct_ptr, 0, size);
422
423 return (struct_ptr);
424 }
425
426
427 /* Free memory allocated by a png_create_struct() call */
428 void /* PRIVATE */
429 png_destroy_struct(png_voidp struct_ptr)
430 {
431 # ifdef PNG_USER_MEM_SUPPORTED
432 png_destroy_struct_2(struct_ptr, NULL, NULL);
433 }
434
435 /* Free memory allocated by a png_create_struct() call */
436 void /* PRIVATE */
437 png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
438 png_voidp mem_ptr)
439 {
440 # endif /* PNG_USER_MEM_SUPPORTED */
441 if (struct_ptr != NULL)
442 {
443 # ifdef PNG_USER_MEM_SUPPORTED
444 if (free_fn != NULL)
445 {
446 png_struct dummy_struct;
447 png_structp png_ptr = &dummy_struct;
448 png_ptr->mem_ptr=mem_ptr;
449 (*(free_fn))(png_ptr, struct_ptr);
450 return;
451 }
452 # endif /* PNG_USER_MEM_SUPPORTED */
453 # if defined(__TURBOC__) && !defined(__FLAT__)
454 farfree(struct_ptr);
455
456 # else
457 # if defined(_MSC_VER) && defined(MAXSEG_64K)
458 hfree(struct_ptr);
459
460 # else
461 free(struct_ptr);
462
463 # endif
464 # endif
465 }
466 }
467
468 /* Allocate memory. For reasonable files, size should never exceed
469 * 64K. However, zlib may allocate more then 64K if you don't tell
470 * it not to. See zconf.h and png.h for more information. zlib does
471 * need to allocate exactly 64K, so whatever you call here must
472 * have the ability to do that.
473 */
474
475 PNG_FUNCTION(png_voidp,PNGAPI
476 png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
477 {
478 png_voidp ret;
479
480 ret = (png_malloc(png_ptr, size));
481
482 if (ret != NULL)
483 png_memset(ret,0,(png_size_t)size);
484
485 return (ret);
486 }
487
488 PNG_FUNCTION(png_voidp,PNGAPI
489 png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
490 {
491 png_voidp ret;
492
493 # ifdef PNG_USER_MEM_SUPPORTED
494 if (png_ptr == NULL || size == 0)
495 return (NULL);
496
497 if (png_ptr->malloc_fn != NULL)
498 ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
499
500 else
501 ret = (png_malloc_default(png_ptr, size));
502
503 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
504 png_error(png_ptr, "Out of Memory");
505
506 return (ret);
507 }
508
509 PNG_FUNCTION(png_voidp,PNGAPI
510 png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
511 {
512 png_voidp ret;
513 # endif /* PNG_USER_MEM_SUPPORTED */
514
515 if (png_ptr == NULL || size == 0)
516 return (NULL);
517
518 # ifdef PNG_MAX_MALLOC_64K
519 if (size > (png_uint_32)65536L)
520 {
521 # ifndef PNG_USER_MEM_SUPPORTED
522 if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
523 png_error(png_ptr, "Cannot Allocate > 64K");
524
525 else
526 # endif
527 return NULL;
528 }
529 # endif
530
531 /* Check for overflow */
532 # if defined(__TURBOC__) && !defined(__FLAT__)
533
534 if (size != (unsigned long)size)
535 ret = NULL;
536
537 else
538 ret = farmalloc(size);
539
540 # else
541 # if defined(_MSC_VER) && defined(MAXSEG_64K)
542 if (size != (unsigned long)size)
543 ret = NULL;
544
545 else
546 ret = halloc(size, 1);
547
548 # else
549 if (size != (size_t)size)
550 ret = NULL;
551
552 else
553 ret = malloc((size_t)size);
554 # endif
555 # endif
556
557 # ifndef PNG_USER_MEM_SUPPORTED
558 if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
559 png_error(png_ptr, "Out of Memory");
560 # endif
561
562 return (ret);
563 }
564
565 /* Free a pointer allocated by png_malloc(). If ptr is NULL, return
566 * without taking any action.
567 */
568 void PNGAPI
569 png_free(png_structp png_ptr, png_voidp ptr)
570 {
571 if (png_ptr == NULL || ptr == NULL)
572 return;
573
574 # ifdef PNG_USER_MEM_SUPPORTED
575 if (png_ptr->free_fn != NULL)
576 {
577 (*(png_ptr->free_fn))(png_ptr, ptr);
578 return;
579 }
580
581 else
582 png_free_default(png_ptr, ptr);
583 }
584
585 void PNGAPI
586 png_free_default(png_structp png_ptr, png_voidp ptr)
587 {
588 if (png_ptr == NULL || ptr == NULL)
589 return;
590
591 # endif /* PNG_USER_MEM_SUPPORTED */
592
593 # if defined(__TURBOC__) && !defined(__FLAT__)
594 farfree(ptr);
595
596 # else
597 # if defined(_MSC_VER) && defined(MAXSEG_64K)
598 hfree(ptr);
599
600 # else
601 free(ptr);
602
603 # endif
604 # endif
605 }
606 #endif /* Not Borland DOS special memory handler */
607
608 /* This function was added at libpng version 1.2.3. The png_malloc_warn()
609 * function will set up png_malloc() to issue a png_warning and return NULL
610 * instead of issuing a png_error, if it fails to allocate the requested
611 * memory.
612 */
613 PNG_FUNCTION(png_voidp,PNGAPI
614 png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
615 {
616 png_voidp ptr;
617 png_uint_32 save_flags;
618 if (png_ptr == NULL)
619 return (NULL);
620
621 save_flags = png_ptr->flags;
622 png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
623 ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
624 png_ptr->flags=save_flags;
625 return(ptr);
626 }
627
628
629 #ifdef PNG_USER_MEM_SUPPORTED
630 /* This function is called when the application wants to use another method
631 * of allocating and freeing memory.
632 */
633 void PNGAPI
634 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
635 malloc_fn, png_free_ptr free_fn)
636 {
637 if (png_ptr != NULL)
638 {
639 png_ptr->mem_ptr = mem_ptr;
640 png_ptr->malloc_fn = malloc_fn;
641 png_ptr->free_fn = free_fn;
642 }
643 }
644
645 /* This function returns a pointer to the mem_ptr associated with the user
646 * functions. The application should free any memory associated with this
647 * pointer before png_write_destroy and png_read_destroy are called.
648 */
649 png_voidp PNGAPI
650 png_get_mem_ptr(png_const_structp png_ptr)
651 {
652 if (png_ptr == NULL)
653 return (NULL);
654
655 return ((png_voidp)png_ptr->mem_ptr);
656 }
657 #endif /* PNG_USER_MEM_SUPPORTED */
658 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
PNG_FUNCTION
PNG_FUNCTION(png_voidp, png_create_struct,(int type), PNG_ALLOCATED)
Definition: pngmem.c:368
PNG_STRUCT_INFO
#define PNG_STRUCT_INFO
Definition: pngpriv.h:315
png_const_structp
PNG_CONST png_struct FAR * png_const_structp
Definition: png.h:796
png_set_mem_fn
void PNGAPI png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Definition: pngmem.c:634
PNG_FLAG_MALLOC_NULL_MEM_OK
#define PNG_FLAG_MALLOC_NULL_MEM_OK
Definition: pngpriv.h:342
png_struct_def
Definition: pngstruct.h:29
png_memset
#define png_memset
Definition: pngpriv.h:227
PNG_STRUCT_PNG
#define PNG_STRUCT_PNG
Definition: pngpriv.h:314
PNG_ALLOCATED
#define PNG_ALLOCATED
Definition: pngconf.h:428
png_info_def
Definition: pnginfo.h:56
png_alloc_size_t
png_size_t png_alloc_size_t
Definition: pngconf.h:627
png_uint_32
unsigned long png_uint_32
Definition: pngconf.h:480
PNGAPI
#define PNGAPI
Definition: pngconf.h:256
png_structp
png_struct FAR * png_structp
Definition: png.h:797
num_blocks
JBLOCKROW JDIMENSION num_blocks
Definition: jpegint.h:376
png_destroy_struct
void png_destroy_struct(png_voidp struct_ptr)
Definition: pngmem.c:429
png_byte
unsigned char png_byte
Definition: pngconf.h:485
png_warning
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
Definition: pngerror.c:108
png_get_mem_ptr
png_voidp PNGAPI png_get_mem_ptr(png_const_structp png_ptr)
Definition: pngmem.c:650
png_bytep
png_byte FAR * png_bytep
Definition: pngconf.h:562
pngpriv.h
png_free_default
void PNGAPI png_free_default(png_structp png_ptr, png_voidp ptr)
Definition: pngmem.c:586
png_get_copyright
png_const_charp PNGAPI png_get_copyright(png_const_structp png_ptr)
Definition: png.c:550
png_voidp
void FAR * png_voidp
Definition: pngconf.h:560
png_destroy_struct_2
void png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, png_voidp mem_ptr)
Definition: pngmem.c:437
png_size_t
size_t png_size_t
Definition: pngconf.h:490
png_free
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
Definition: pngmem.c:569
png_sizeof
#define png_sizeof(x)
Definition: pngconf.h:492