/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/pngmem.c
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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 4 months ago) by william
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committing r3113 initial commit again...
1 william 31
2     /* pngmem.c - stub functions for memory allocation
3     *
4     * Last changed in libpng 1.2.37 [June 4, 2009]
5     * Copyright (c) 1998-2009 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     #define PNG_INTERNAL
21     #include "png.h"
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_voidp /* PRIVATE */
31     png_create_struct(int type)
32     {
33     #ifdef PNG_USER_MEM_SUPPORTED
34     return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
35     }
36    
37     /* Alternate version of png_create_struct, for use with user-defined malloc. */
38     png_voidp /* PRIVATE */
39     png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
40     {
41     #endif /* PNG_USER_MEM_SUPPORTED */
42     png_size_t size;
43     png_voidp struct_ptr;
44    
45     if (type == PNG_STRUCT_INFO)
46     size = png_sizeof(png_info);
47     else if (type == PNG_STRUCT_PNG)
48     size = png_sizeof(png_struct);
49     else
50     return (png_get_copyright(NULL));
51    
52     #ifdef PNG_USER_MEM_SUPPORTED
53     if (malloc_fn != NULL)
54     {
55     png_struct dummy_struct;
56     png_structp png_ptr = &dummy_struct;
57     png_ptr->mem_ptr=mem_ptr;
58     struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
59     }
60     else
61     #endif /* PNG_USER_MEM_SUPPORTED */
62     struct_ptr = (png_voidp)farmalloc(size);
63     if (struct_ptr != NULL)
64     png_memset(struct_ptr, 0, size);
65     return (struct_ptr);
66     }
67    
68     /* Free memory allocated by a png_create_struct() call */
69     void /* PRIVATE */
70     png_destroy_struct(png_voidp struct_ptr)
71     {
72     #ifdef PNG_USER_MEM_SUPPORTED
73     png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
74     }
75    
76     /* Free memory allocated by a png_create_struct() call */
77     void /* PRIVATE */
78     png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
79     png_voidp mem_ptr)
80     {
81     #endif
82     if (struct_ptr != NULL)
83     {
84     #ifdef PNG_USER_MEM_SUPPORTED
85     if (free_fn != NULL)
86     {
87     png_struct dummy_struct;
88     png_structp png_ptr = &dummy_struct;
89     png_ptr->mem_ptr=mem_ptr;
90     (*(free_fn))(png_ptr, struct_ptr);
91     return;
92     }
93     #endif /* PNG_USER_MEM_SUPPORTED */
94     farfree (struct_ptr);
95     }
96     }
97    
98     /* Allocate memory. For reasonable files, size should never exceed
99     * 64K. However, zlib may allocate more then 64K if you don't tell
100     * it not to. See zconf.h and png.h for more information. zlib does
101     * need to allocate exactly 64K, so whatever you call here must
102     * have the ability to do that.
103     *
104     * Borland seems to have a problem in DOS mode for exactly 64K.
105     * It gives you a segment with an offset of 8 (perhaps to store its
106     * memory stuff). zlib doesn't like this at all, so we have to
107     * detect and deal with it. This code should not be needed in
108     * Windows or OS/2 modes, and only in 16 bit mode. This code has
109     * been updated by Alexander Lehmann for version 0.89 to waste less
110     * memory.
111     *
112     * Note that we can't use png_size_t for the "size" declaration,
113     * since on some systems a png_size_t is a 16-bit quantity, and as a
114     * result, we would be truncating potentially larger memory requests
115     * (which should cause a fatal error) and introducing major problems.
116     */
117    
118     png_voidp PNGAPI
119     png_malloc(png_structp png_ptr, png_uint_32 size)
120     {
121     png_voidp ret;
122    
123     if (png_ptr == NULL || size == 0)
124     return (NULL);
125    
126     #ifdef PNG_USER_MEM_SUPPORTED
127     if (png_ptr->malloc_fn != NULL)
128     ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
129     else
130     ret = (png_malloc_default(png_ptr, size));
131     if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
132     png_error(png_ptr, "Out of memory!");
133     return (ret);
134     }
135    
136     png_voidp PNGAPI
137     png_malloc_default(png_structp png_ptr, png_uint_32 size)
138     {
139     png_voidp ret;
140     #endif /* PNG_USER_MEM_SUPPORTED */
141    
142     if (png_ptr == NULL || size == 0)
143     return (NULL);
144    
145     #ifdef PNG_MAX_MALLOC_64K
146     if (size > (png_uint_32)65536L)
147     {
148     png_warning(png_ptr, "Cannot Allocate > 64K");
149     ret = NULL;
150     }
151     else
152     #endif
153    
154     if (size != (size_t)size)
155     ret = NULL;
156     else if (size == (png_uint_32)65536L)
157     {
158     if (png_ptr->offset_table == NULL)
159     {
160     /* Try to see if we need to do any of this fancy stuff */
161     ret = farmalloc(size);
162     if (ret == NULL || ((png_size_t)ret & 0xffff))
163     {
164     int num_blocks;
165     png_uint_32 total_size;
166     png_bytep table;
167     int i;
168     png_byte huge * hptr;
169    
170     if (ret != NULL)
171     {
172     farfree(ret);
173     ret = NULL;
174     }
175    
176     if (png_ptr->zlib_window_bits > 14)
177     num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
178     else
179     num_blocks = 1;
180     if (png_ptr->zlib_mem_level >= 7)
181     num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
182     else
183     num_blocks++;
184    
185     total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
186    
187     table = farmalloc(total_size);
188    
189     if (table == NULL)
190     {
191     #ifndef PNG_USER_MEM_SUPPORTED
192     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
193     png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
194     else
195     png_warning(png_ptr, "Out Of Memory.");
196     #endif
197     return (NULL);
198     }
199    
200     if ((png_size_t)table & 0xfff0)
201     {
202     #ifndef PNG_USER_MEM_SUPPORTED
203     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
204     png_error(png_ptr,
205     "Farmalloc didn't return normalized pointer");
206     else
207     png_warning(png_ptr,
208     "Farmalloc didn't return normalized pointer");
209     #endif
210     return (NULL);
211     }
212    
213     png_ptr->offset_table = table;
214     png_ptr->offset_table_ptr = farmalloc(num_blocks *
215     png_sizeof(png_bytep));
216    
217     if (png_ptr->offset_table_ptr == NULL)
218     {
219     #ifndef PNG_USER_MEM_SUPPORTED
220     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
221     png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
222     else
223     png_warning(png_ptr, "Out Of memory.");
224     #endif
225     return (NULL);
226     }
227    
228     hptr = (png_byte huge *)table;
229     if ((png_size_t)hptr & 0xf)
230     {
231     hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
232     hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
233     }
234     for (i = 0; i < num_blocks; i++)
235     {
236     png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
237     hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
238     }
239    
240     png_ptr->offset_table_number = num_blocks;
241     png_ptr->offset_table_count = 0;
242     png_ptr->offset_table_count_free = 0;
243     }
244     }
245    
246     if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
247     {
248     #ifndef PNG_USER_MEM_SUPPORTED
249     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
250     png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
251     else
252     png_warning(png_ptr, "Out of Memory.");
253     #endif
254     return (NULL);
255     }
256    
257     ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
258     }
259     else
260     ret = farmalloc(size);
261    
262     #ifndef PNG_USER_MEM_SUPPORTED
263     if (ret == NULL)
264     {
265     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
266     png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
267     else
268     png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
269     }
270     #endif
271    
272     return (ret);
273     }
274    
275     /* Free a pointer allocated by png_malloc(). In the default
276     * configuration, png_ptr is not used, but is passed in case it
277     * is needed. If ptr is NULL, return without taking any action.
278     */
279     void PNGAPI
280     png_free(png_structp png_ptr, png_voidp ptr)
281     {
282     if (png_ptr == NULL || ptr == NULL)
283     return;
284    
285     #ifdef PNG_USER_MEM_SUPPORTED
286     if (png_ptr->free_fn != NULL)
287     {
288     (*(png_ptr->free_fn))(png_ptr, ptr);
289     return;
290     }
291     else
292     png_free_default(png_ptr, ptr);
293     }
294    
295     void PNGAPI
296     png_free_default(png_structp png_ptr, png_voidp ptr)
297     {
298     #endif /* PNG_USER_MEM_SUPPORTED */
299    
300     if (png_ptr == NULL || ptr == NULL)
301     return;
302    
303     if (png_ptr->offset_table != NULL)
304     {
305     int i;
306    
307     for (i = 0; i < png_ptr->offset_table_count; i++)
308     {
309     if (ptr == png_ptr->offset_table_ptr[i])
310     {
311     ptr = NULL;
312     png_ptr->offset_table_count_free++;
313     break;
314     }
315     }
316     if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
317     {
318     farfree(png_ptr->offset_table);
319     farfree(png_ptr->offset_table_ptr);
320     png_ptr->offset_table = NULL;
321     png_ptr->offset_table_ptr = NULL;
322     }
323     }
324    
325     if (ptr != NULL)
326     {
327     farfree(ptr);
328     }
329     }
330    
331     #else /* Not the Borland DOS special memory handler */
332    
333     /* Allocate memory for a png_struct or a png_info. The malloc and
334     memset can be replaced by a single call to calloc() if this is thought
335     to improve performance noticably. */
336     png_voidp /* PRIVATE */
337     png_create_struct(int type)
338     {
339     #ifdef PNG_USER_MEM_SUPPORTED
340     return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
341     }
342    
343     /* Allocate memory for a png_struct or a png_info. The malloc and
344     memset can be replaced by a single call to calloc() if this is thought
345     to improve performance noticably. */
346     png_voidp /* PRIVATE */
347     png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
348     {
349     #endif /* PNG_USER_MEM_SUPPORTED */
350     png_size_t size;
351     png_voidp struct_ptr;
352    
353     if (type == PNG_STRUCT_INFO)
354     size = png_sizeof(png_info);
355     else if (type == PNG_STRUCT_PNG)
356     size = png_sizeof(png_struct);
357     else
358     return (NULL);
359    
360     #ifdef PNG_USER_MEM_SUPPORTED
361     if (malloc_fn != NULL)
362     {
363     png_struct dummy_struct;
364     png_structp png_ptr = &dummy_struct;
365     png_ptr->mem_ptr=mem_ptr;
366     struct_ptr = (*(malloc_fn))(png_ptr, size);
367     if (struct_ptr != NULL)
368     png_memset(struct_ptr, 0, size);
369     return (struct_ptr);
370     }
371     #endif /* PNG_USER_MEM_SUPPORTED */
372    
373     #if defined(__TURBOC__) && !defined(__FLAT__)
374     struct_ptr = (png_voidp)farmalloc(size);
375     #else
376     # if defined(_MSC_VER) && defined(MAXSEG_64K)
377     struct_ptr = (png_voidp)halloc(size, 1);
378     # else
379     struct_ptr = (png_voidp)malloc(size);
380     # endif
381     #endif
382     if (struct_ptr != NULL)
383     png_memset(struct_ptr, 0, size);
384    
385     return (struct_ptr);
386     }
387    
388    
389     /* Free memory allocated by a png_create_struct() call */
390     void /* PRIVATE */
391     png_destroy_struct(png_voidp struct_ptr)
392     {
393     #ifdef PNG_USER_MEM_SUPPORTED
394     png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
395     }
396    
397     /* Free memory allocated by a png_create_struct() call */
398     void /* PRIVATE */
399     png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
400     png_voidp mem_ptr)
401     {
402     #endif /* PNG_USER_MEM_SUPPORTED */
403     if (struct_ptr != NULL)
404     {
405     #ifdef PNG_USER_MEM_SUPPORTED
406     if (free_fn != NULL)
407     {
408     png_struct dummy_struct;
409     png_structp png_ptr = &dummy_struct;
410     png_ptr->mem_ptr=mem_ptr;
411     (*(free_fn))(png_ptr, struct_ptr);
412     return;
413     }
414     #endif /* PNG_USER_MEM_SUPPORTED */
415     #if defined(__TURBOC__) && !defined(__FLAT__)
416     farfree(struct_ptr);
417     #else
418     # if defined(_MSC_VER) && defined(MAXSEG_64K)
419     hfree(struct_ptr);
420     # else
421     free(struct_ptr);
422     # endif
423     #endif
424     }
425     }
426    
427     /* Allocate memory. For reasonable files, size should never exceed
428     * 64K. However, zlib may allocate more then 64K if you don't tell
429     * it not to. See zconf.h and png.h for more information. zlib does
430     * need to allocate exactly 64K, so whatever you call here must
431     * have the ability to do that.
432     */
433    
434    
435     png_voidp PNGAPI
436     png_malloc(png_structp png_ptr, png_uint_32 size)
437     {
438     png_voidp ret;
439    
440     #ifdef PNG_USER_MEM_SUPPORTED
441     if (png_ptr == NULL || size == 0)
442     return (NULL);
443    
444     if (png_ptr->malloc_fn != NULL)
445     ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
446     else
447     ret = (png_malloc_default(png_ptr, size));
448     if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
449     png_error(png_ptr, "Out of Memory!");
450     return (ret);
451     }
452    
453     png_voidp PNGAPI
454     png_malloc_default(png_structp png_ptr, png_uint_32 size)
455     {
456     png_voidp ret;
457     #endif /* PNG_USER_MEM_SUPPORTED */
458    
459     if (png_ptr == NULL || size == 0)
460     return (NULL);
461    
462     #ifdef PNG_MAX_MALLOC_64K
463     if (size > (png_uint_32)65536L)
464     {
465     #ifndef PNG_USER_MEM_SUPPORTED
466     if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
467     png_error(png_ptr, "Cannot Allocate > 64K");
468     else
469     #endif
470     return NULL;
471     }
472     #endif
473    
474     /* Check for overflow */
475     #if defined(__TURBOC__) && !defined(__FLAT__)
476     if (size != (unsigned long)size)
477     ret = NULL;
478     else
479     ret = farmalloc(size);
480     #else
481     # if defined(_MSC_VER) && defined(MAXSEG_64K)
482     if (size != (unsigned long)size)
483     ret = NULL;
484     else
485     ret = halloc(size, 1);
486     # else
487     if (size != (size_t)size)
488     ret = NULL;
489     else
490     ret = malloc((size_t)size);
491     # endif
492     #endif
493    
494     #ifndef PNG_USER_MEM_SUPPORTED
495     if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
496     png_error(png_ptr, "Out of Memory");
497     #endif
498    
499     return (ret);
500     }
501    
502     /* Free a pointer allocated by png_malloc(). If ptr is NULL, return
503     * without taking any action.
504     */
505     void PNGAPI
506     png_free(png_structp png_ptr, png_voidp ptr)
507     {
508     if (png_ptr == NULL || ptr == NULL)
509     return;
510    
511     #ifdef PNG_USER_MEM_SUPPORTED
512     if (png_ptr->free_fn != NULL)
513     {
514     (*(png_ptr->free_fn))(png_ptr, ptr);
515     return;
516     }
517     else
518     png_free_default(png_ptr, ptr);
519     }
520     void PNGAPI
521     png_free_default(png_structp png_ptr, png_voidp ptr)
522     {
523     if (png_ptr == NULL || ptr == NULL)
524     return;
525    
526     #endif /* PNG_USER_MEM_SUPPORTED */
527    
528     #if defined(__TURBOC__) && !defined(__FLAT__)
529     farfree(ptr);
530     #else
531     # if defined(_MSC_VER) && defined(MAXSEG_64K)
532     hfree(ptr);
533     # else
534     free(ptr);
535     # endif
536     #endif
537     }
538    
539     #endif /* Not Borland DOS special memory handler */
540    
541     #if defined(PNG_1_0_X)
542     # define png_malloc_warn png_malloc
543     #else
544     /* This function was added at libpng version 1.2.3. The png_malloc_warn()
545     * function will set up png_malloc() to issue a png_warning and return NULL
546     * instead of issuing a png_error, if it fails to allocate the requested
547     * memory.
548     */
549     png_voidp PNGAPI
550     png_malloc_warn(png_structp png_ptr, png_uint_32 size)
551     {
552     png_voidp ptr;
553     png_uint_32 save_flags;
554     if (png_ptr == NULL)
555     return (NULL);
556    
557     save_flags = png_ptr->flags;
558     png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
559     ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
560     png_ptr->flags=save_flags;
561     return(ptr);
562     }
563     #endif
564    
565     png_voidp PNGAPI
566     png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
567     png_uint_32 length)
568     {
569     png_size_t size;
570    
571     size = (png_size_t)length;
572     if ((png_uint_32)size != length)
573     png_error(png_ptr, "Overflow in png_memcpy_check.");
574    
575     return(png_memcpy (s1, s2, size));
576     }
577    
578     png_voidp PNGAPI
579     png_memset_check (png_structp png_ptr, png_voidp s1, int value,
580     png_uint_32 length)
581     {
582     png_size_t size;
583    
584     size = (png_size_t)length;
585     if ((png_uint_32)size != length)
586     png_error(png_ptr, "Overflow in png_memset_check.");
587    
588     return (png_memset (s1, value, size));
589    
590     }
591    
592     #ifdef PNG_USER_MEM_SUPPORTED
593     /* This function is called when the application wants to use another method
594     * of allocating and freeing memory.
595     */
596     void PNGAPI
597     png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
598     malloc_fn, png_free_ptr free_fn)
599     {
600     if (png_ptr != NULL)
601     {
602     png_ptr->mem_ptr = mem_ptr;
603     png_ptr->malloc_fn = malloc_fn;
604     png_ptr->free_fn = free_fn;
605     }
606     }
607    
608     /* This function returns a pointer to the mem_ptr associated with the user
609     * functions. The application should free any memory associated with this
610     * pointer before png_write_destroy and png_read_destroy are called.
611     */
612     png_voidp PNGAPI
613     png_get_mem_ptr(png_structp png_ptr)
614     {
615     if (png_ptr == NULL)
616     return (NULL);
617     return ((png_voidp)png_ptr->mem_ptr);
618     }
619     #endif /* PNG_USER_MEM_SUPPORTED */
620     #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

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