/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/png.c
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Annotation of /trunk/3rdparty/wxWidgets/src/png/png.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
File MIME type: text/plain
File size: 26746 byte(s)
committing r3113 initial commit again...
1 william 31
2     /* png.c - location for general purpose libpng functions
3     *
4     * Last changed in libpng 1.2.39 [August 13, 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    
14     #define PNG_INTERNAL
15     #define PNG_NO_EXTERN
16     #include "png.h"
17    
18     /* Generate a compiler error if there is an old png.h in the search path. */
19     typedef version_1_2_39 Your_png_h_is_not_version_1_2_39;
20    
21     /* Version information for C files. This had better match the version
22     * string defined in png.h. */
23    
24     #ifdef PNG_USE_GLOBAL_ARRAYS
25     /* png_libpng_ver was changed to a function in version 1.0.5c */
26     PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
27    
28     #ifdef PNG_READ_SUPPORTED
29    
30     /* png_sig was changed to a function in version 1.0.5c */
31     /* Place to hold the signature string for a PNG file. */
32     PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
33     #endif /* PNG_READ_SUPPORTED */
34    
35     /* Invoke global declarations for constant strings for known chunk types */
36     PNG_IHDR;
37     PNG_IDAT;
38     PNG_IEND;
39     PNG_PLTE;
40     PNG_bKGD;
41     PNG_cHRM;
42     PNG_gAMA;
43     PNG_hIST;
44     PNG_iCCP;
45     PNG_iTXt;
46     PNG_oFFs;
47     PNG_pCAL;
48     PNG_sCAL;
49     PNG_pHYs;
50     PNG_sBIT;
51     PNG_sPLT;
52     PNG_sRGB;
53     PNG_tEXt;
54     PNG_tIME;
55     PNG_tRNS;
56     PNG_zTXt;
57    
58     #ifdef PNG_READ_SUPPORTED
59     /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
60    
61     /* Start of interlace block */
62     PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
63    
64     /* Offset to next interlace block */
65     PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
66    
67     /* Start of interlace block in the y direction */
68     PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
69    
70     /* Offset to next interlace block in the y direction */
71     PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
72    
73     /* Height of interlace block. This is not currently used - if you need
74     * it, uncomment it here and in png.h
75     PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
76     */
77    
78     /* Mask to determine which pixels are valid in a pass */
79     PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
80    
81     /* Mask to determine which pixels to overwrite while displaying */
82     PNG_CONST int FARDATA png_pass_dsp_mask[]
83     = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
84    
85     #endif /* PNG_READ_SUPPORTED */
86     #endif /* PNG_USE_GLOBAL_ARRAYS */
87    
88     /* Tells libpng that we have already handled the first "num_bytes" bytes
89     * of the PNG file signature. If the PNG data is embedded into another
90     * stream we can set num_bytes = 8 so that libpng will not attempt to read
91     * or write any of the magic bytes before it starts on the IHDR.
92     */
93    
94     #ifdef PNG_READ_SUPPORTED
95     void PNGAPI
96     png_set_sig_bytes(png_structp png_ptr, int num_bytes)
97     {
98     if (png_ptr == NULL)
99     return;
100     png_debug(1, "in png_set_sig_bytes");
101     if (num_bytes > 8)
102     png_error(png_ptr, "Too many bytes for PNG signature.");
103    
104     png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
105     }
106    
107     /* Checks whether the supplied bytes match the PNG signature. We allow
108     * checking less than the full 8-byte signature so that those apps that
109     * already read the first few bytes of a file to determine the file type
110     * can simply check the remaining bytes for extra assurance. Returns
111     * an integer less than, equal to, or greater than zero if sig is found,
112     * respectively, to be less than, to match, or be greater than the correct
113     * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
114     */
115     int PNGAPI
116     png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
117     {
118     png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
119     if (num_to_check > 8)
120     num_to_check = 8;
121     else if (num_to_check < 1)
122     return (-1);
123    
124     if (start > 7)
125     return (-1);
126    
127     if (start + num_to_check > 8)
128     num_to_check = 8 - start;
129    
130     return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
131     }
132    
133     #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
134     /* (Obsolete) function to check signature bytes. It does not allow one
135     * to check a partial signature. This function might be removed in the
136     * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG.
137     */
138     int PNGAPI
139     png_check_sig(png_bytep sig, int num)
140     {
141     return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
142     }
143     #endif
144     #endif /* PNG_READ_SUPPORTED */
145    
146     #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
147     /* Function to allocate memory for zlib and clear it to 0. */
148     #ifdef PNG_1_0_X
149     voidpf PNGAPI
150     #else
151     voidpf /* PRIVATE */
152     #endif
153     png_zalloc(voidpf png_ptr, uInt items, uInt size)
154     {
155     png_voidp ptr;
156     png_structp p=(png_structp)png_ptr;
157     png_uint_32 save_flags=p->flags;
158     png_uint_32 num_bytes;
159    
160     if (png_ptr == NULL)
161     return (NULL);
162     if (items > PNG_UINT_32_MAX/size)
163     {
164     png_warning (p, "Potential overflow in png_zalloc()");
165     return (NULL);
166     }
167     num_bytes = (png_uint_32)items * size;
168    
169     p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
170     ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
171     p->flags=save_flags;
172    
173     #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
174     if (ptr == NULL)
175     return ((voidpf)ptr);
176    
177     if (num_bytes > (png_uint_32)0x8000L)
178     {
179     png_memset(ptr, 0, (png_size_t)0x8000L);
180     png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
181     (png_size_t)(num_bytes - (png_uint_32)0x8000L));
182     }
183     else
184     {
185     png_memset(ptr, 0, (png_size_t)num_bytes);
186     }
187     #endif
188     return ((voidpf)ptr);
189     }
190    
191     /* Function to free memory for zlib */
192     #ifdef PNG_1_0_X
193     void PNGAPI
194     #else
195     void /* PRIVATE */
196     #endif
197     png_zfree(voidpf png_ptr, voidpf ptr)
198     {
199     png_free((png_structp)png_ptr, (png_voidp)ptr);
200     }
201    
202     /* Reset the CRC variable to 32 bits of 1's. Care must be taken
203     * in case CRC is > 32 bits to leave the top bits 0.
204     */
205     void /* PRIVATE */
206     png_reset_crc(png_structp png_ptr)
207     {
208     png_ptr->crc = crc32(0, Z_NULL, 0);
209     }
210    
211     /* Calculate the CRC over a section of data. We can only pass as
212     * much data to this routine as the largest single buffer size. We
213     * also check that this data will actually be used before going to the
214     * trouble of calculating it.
215     */
216     void /* PRIVATE */
217     png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
218     {
219     int need_crc = 1;
220    
221     if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
222     {
223     if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
224     (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
225     need_crc = 0;
226     }
227     else /* critical */
228     {
229     if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
230     need_crc = 0;
231     }
232    
233     if (need_crc)
234     png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
235     }
236    
237     /* Allocate the memory for an info_struct for the application. We don't
238     * really need the png_ptr, but it could potentially be useful in the
239     * future. This should be used in favour of malloc(png_sizeof(png_info))
240     * and png_info_init() so that applications that want to use a shared
241     * libpng don't have to be recompiled if png_info changes size.
242     */
243     png_infop PNGAPI
244     png_create_info_struct(png_structp png_ptr)
245     {
246     png_infop info_ptr;
247    
248     png_debug(1, "in png_create_info_struct");
249     if (png_ptr == NULL)
250     return (NULL);
251     #ifdef PNG_USER_MEM_SUPPORTED
252     info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
253     png_ptr->malloc_fn, png_ptr->mem_ptr);
254     #else
255     info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
256     #endif
257     if (info_ptr != NULL)
258     png_info_init_3(&info_ptr, png_sizeof(png_info));
259    
260     return (info_ptr);
261     }
262    
263     /* This function frees the memory associated with a single info struct.
264     * Normally, one would use either png_destroy_read_struct() or
265     * png_destroy_write_struct() to free an info struct, but this may be
266     * useful for some applications.
267     */
268     void PNGAPI
269     png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
270     {
271     png_infop info_ptr = NULL;
272     if (png_ptr == NULL)
273     return;
274    
275     png_debug(1, "in png_destroy_info_struct");
276     if (info_ptr_ptr != NULL)
277     info_ptr = *info_ptr_ptr;
278    
279     if (info_ptr != NULL)
280     {
281     png_info_destroy(png_ptr, info_ptr);
282    
283     #ifdef PNG_USER_MEM_SUPPORTED
284     png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
285     png_ptr->mem_ptr);
286     #else
287     png_destroy_struct((png_voidp)info_ptr);
288     #endif
289     *info_ptr_ptr = NULL;
290     }
291     }
292    
293     /* Initialize the info structure. This is now an internal function (0.89)
294     * and applications using it are urged to use png_create_info_struct()
295     * instead.
296     */
297     #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
298     #undef png_info_init
299     void PNGAPI
300     png_info_init(png_infop info_ptr)
301     {
302     /* We only come here via pre-1.0.12-compiled applications */
303     png_info_init_3(&info_ptr, 0);
304     }
305     #endif
306    
307     void PNGAPI
308     png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
309     {
310     png_infop info_ptr = *ptr_ptr;
311    
312     if (info_ptr == NULL)
313     return;
314    
315     png_debug(1, "in png_info_init_3");
316    
317     if (png_sizeof(png_info) > png_info_struct_size)
318     {
319     png_destroy_struct(info_ptr);
320     info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
321     *ptr_ptr = info_ptr;
322     }
323    
324     /* Set everything to 0 */
325     png_memset(info_ptr, 0, png_sizeof(png_info));
326     }
327    
328     #ifdef PNG_FREE_ME_SUPPORTED
329     void PNGAPI
330     png_data_freer(png_structp png_ptr, png_infop info_ptr,
331     int freer, png_uint_32 mask)
332     {
333     png_debug(1, "in png_data_freer");
334     if (png_ptr == NULL || info_ptr == NULL)
335     return;
336     if (freer == PNG_DESTROY_WILL_FREE_DATA)
337     info_ptr->free_me |= mask;
338     else if (freer == PNG_USER_WILL_FREE_DATA)
339     info_ptr->free_me &= ~mask;
340     else
341     png_warning(png_ptr,
342     "Unknown freer parameter in png_data_freer.");
343     }
344     #endif
345    
346     void PNGAPI
347     png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
348     int num)
349     {
350     png_debug(1, "in png_free_data");
351     if (png_ptr == NULL || info_ptr == NULL)
352     return;
353    
354     #if defined(PNG_TEXT_SUPPORTED)
355     /* Free text item num or (if num == -1) all text items */
356     #ifdef PNG_FREE_ME_SUPPORTED
357     if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
358     #else
359     if (mask & PNG_FREE_TEXT)
360     #endif
361     {
362     if (num != -1)
363     {
364     if (info_ptr->text && info_ptr->text[num].key)
365     {
366     png_free(png_ptr, info_ptr->text[num].key);
367     info_ptr->text[num].key = NULL;
368     }
369     }
370     else
371     {
372     int i;
373     for (i = 0; i < info_ptr->num_text; i++)
374     png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
375     png_free(png_ptr, info_ptr->text);
376     info_ptr->text = NULL;
377     info_ptr->num_text=0;
378     }
379     }
380     #endif
381    
382     #if defined(PNG_tRNS_SUPPORTED)
383     /* Free any tRNS entry */
384     #ifdef PNG_FREE_ME_SUPPORTED
385     if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
386     #else
387     if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
388     #endif
389     {
390     png_free(png_ptr, info_ptr->trans);
391     info_ptr->trans = NULL;
392     info_ptr->valid &= ~PNG_INFO_tRNS;
393     #ifndef PNG_FREE_ME_SUPPORTED
394     png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
395     #endif
396     }
397     #endif
398    
399     #if defined(PNG_sCAL_SUPPORTED)
400     /* Free any sCAL entry */
401     #ifdef PNG_FREE_ME_SUPPORTED
402     if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
403     #else
404     if (mask & PNG_FREE_SCAL)
405     #endif
406     {
407     #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
408     png_free(png_ptr, info_ptr->scal_s_width);
409     png_free(png_ptr, info_ptr->scal_s_height);
410     info_ptr->scal_s_width = NULL;
411     info_ptr->scal_s_height = NULL;
412     #endif
413     info_ptr->valid &= ~PNG_INFO_sCAL;
414     }
415     #endif
416    
417     #if defined(PNG_pCAL_SUPPORTED)
418     /* Free any pCAL entry */
419     #ifdef PNG_FREE_ME_SUPPORTED
420     if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
421     #else
422     if (mask & PNG_FREE_PCAL)
423     #endif
424     {
425     png_free(png_ptr, info_ptr->pcal_purpose);
426     png_free(png_ptr, info_ptr->pcal_units);
427     info_ptr->pcal_purpose = NULL;
428     info_ptr->pcal_units = NULL;
429     if (info_ptr->pcal_params != NULL)
430     {
431     int i;
432     for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
433     {
434     png_free(png_ptr, info_ptr->pcal_params[i]);
435     info_ptr->pcal_params[i]=NULL;
436     }
437     png_free(png_ptr, info_ptr->pcal_params);
438     info_ptr->pcal_params = NULL;
439     }
440     info_ptr->valid &= ~PNG_INFO_pCAL;
441     }
442     #endif
443    
444     #if defined(PNG_iCCP_SUPPORTED)
445     /* Free any iCCP entry */
446     #ifdef PNG_FREE_ME_SUPPORTED
447     if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
448     #else
449     if (mask & PNG_FREE_ICCP)
450     #endif
451     {
452     png_free(png_ptr, info_ptr->iccp_name);
453     png_free(png_ptr, info_ptr->iccp_profile);
454     info_ptr->iccp_name = NULL;
455     info_ptr->iccp_profile = NULL;
456     info_ptr->valid &= ~PNG_INFO_iCCP;
457     }
458     #endif
459    
460     #if defined(PNG_sPLT_SUPPORTED)
461     /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
462     #ifdef PNG_FREE_ME_SUPPORTED
463     if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
464     #else
465     if (mask & PNG_FREE_SPLT)
466     #endif
467     {
468     if (num != -1)
469     {
470     if (info_ptr->splt_palettes)
471     {
472     png_free(png_ptr, info_ptr->splt_palettes[num].name);
473     png_free(png_ptr, info_ptr->splt_palettes[num].entries);
474     info_ptr->splt_palettes[num].name = NULL;
475     info_ptr->splt_palettes[num].entries = NULL;
476     }
477     }
478     else
479     {
480     if (info_ptr->splt_palettes_num)
481     {
482     int i;
483     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
484     png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
485    
486     png_free(png_ptr, info_ptr->splt_palettes);
487     info_ptr->splt_palettes = NULL;
488     info_ptr->splt_palettes_num = 0;
489     }
490     info_ptr->valid &= ~PNG_INFO_sPLT;
491     }
492     }
493     #endif
494    
495     #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
496     if (png_ptr->unknown_chunk.data)
497     {
498     png_free(png_ptr, png_ptr->unknown_chunk.data);
499     png_ptr->unknown_chunk.data = NULL;
500     }
501    
502     #ifdef PNG_FREE_ME_SUPPORTED
503     if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
504     #else
505     if (mask & PNG_FREE_UNKN)
506     #endif
507     {
508     if (num != -1)
509     {
510     if (info_ptr->unknown_chunks)
511     {
512     png_free(png_ptr, info_ptr->unknown_chunks[num].data);
513     info_ptr->unknown_chunks[num].data = NULL;
514     }
515     }
516     else
517     {
518     int i;
519    
520     if (info_ptr->unknown_chunks_num)
521     {
522     for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
523     png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
524    
525     png_free(png_ptr, info_ptr->unknown_chunks);
526     info_ptr->unknown_chunks = NULL;
527     info_ptr->unknown_chunks_num = 0;
528     }
529     }
530     }
531     #endif
532    
533     #if defined(PNG_hIST_SUPPORTED)
534     /* Free any hIST entry */
535     #ifdef PNG_FREE_ME_SUPPORTED
536     if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
537     #else
538     if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
539     #endif
540     {
541     png_free(png_ptr, info_ptr->hist);
542     info_ptr->hist = NULL;
543     info_ptr->valid &= ~PNG_INFO_hIST;
544     #ifndef PNG_FREE_ME_SUPPORTED
545     png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
546     #endif
547     }
548     #endif
549    
550     /* Free any PLTE entry that was internally allocated */
551     #ifdef PNG_FREE_ME_SUPPORTED
552     if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
553     #else
554     if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
555     #endif
556     {
557     png_zfree(png_ptr, info_ptr->palette);
558     info_ptr->palette = NULL;
559     info_ptr->valid &= ~PNG_INFO_PLTE;
560     #ifndef PNG_FREE_ME_SUPPORTED
561     png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
562     #endif
563     info_ptr->num_palette = 0;
564     }
565    
566     #if defined(PNG_INFO_IMAGE_SUPPORTED)
567     /* Free any image bits attached to the info structure */
568     #ifdef PNG_FREE_ME_SUPPORTED
569     if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
570     #else
571     if (mask & PNG_FREE_ROWS)
572     #endif
573     {
574     if (info_ptr->row_pointers)
575     {
576     int row;
577     for (row = 0; row < (int)info_ptr->height; row++)
578     {
579     png_free(png_ptr, info_ptr->row_pointers[row]);
580     info_ptr->row_pointers[row]=NULL;
581     }
582     png_free(png_ptr, info_ptr->row_pointers);
583     info_ptr->row_pointers=NULL;
584     }
585     info_ptr->valid &= ~PNG_INFO_IDAT;
586     }
587     #endif
588    
589     #ifdef PNG_FREE_ME_SUPPORTED
590     if (num == -1)
591     info_ptr->free_me &= ~mask;
592     else
593     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
594     #endif
595     }
596    
597     /* This is an internal routine to free any memory that the info struct is
598     * pointing to before re-using it or freeing the struct itself. Recall
599     * that png_free() checks for NULL pointers for us.
600     */
601     void /* PRIVATE */
602     png_info_destroy(png_structp png_ptr, png_infop info_ptr)
603     {
604     png_debug(1, "in png_info_destroy");
605    
606     png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
607    
608     #if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
609     if (png_ptr->num_chunk_list)
610     {
611     png_free(png_ptr, png_ptr->chunk_list);
612     png_ptr->chunk_list=NULL;
613     png_ptr->num_chunk_list = 0;
614     }
615     #endif
616    
617     png_info_init_3(&info_ptr, png_sizeof(png_info));
618     }
619     #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
620    
621     /* This function returns a pointer to the io_ptr associated with the user
622     * functions. The application should free any memory associated with this
623     * pointer before png_write_destroy() or png_read_destroy() are called.
624     */
625     png_voidp PNGAPI
626     png_get_io_ptr(png_structp png_ptr)
627     {
628     if (png_ptr == NULL)
629     return (NULL);
630     return (png_ptr->io_ptr);
631     }
632    
633     #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
634     #if !defined(PNG_NO_STDIO)
635     /* Initialize the default input/output functions for the PNG file. If you
636     * use your own read or write routines, you can call either png_set_read_fn()
637     * or png_set_write_fn() instead of png_init_io(). If you have defined
638     * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
639     * necessarily available.
640     */
641     void PNGAPI
642     png_init_io(png_structp png_ptr, png_FILE_p fp)
643     {
644     png_debug(1, "in png_init_io");
645     if (png_ptr == NULL)
646     return;
647     png_ptr->io_ptr = (png_voidp)fp;
648     }
649     #endif
650    
651     #if defined(PNG_TIME_RFC1123_SUPPORTED)
652     /* Convert the supplied time into an RFC 1123 string suitable for use in
653     * a "Creation Time" or other text-based time string.
654     */
655     png_charp PNGAPI
656     png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
657     {
658     static PNG_CONST char short_months[12][4] =
659     {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
660     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
661    
662     if (png_ptr == NULL)
663     return (NULL);
664     if (png_ptr->time_buffer == NULL)
665     {
666     png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
667     png_sizeof(char)));
668     }
669    
670     #if defined(_WIN32_WCE)
671     {
672     wchar_t time_buf[29];
673     wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
674     ptime->day % 32, short_months[(ptime->month - 1) % 12],
675     ptime->year, ptime->hour % 24, ptime->minute % 60,
676     ptime->second % 61);
677     WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
678     NULL, NULL);
679     }
680     #else
681     #ifdef USE_FAR_KEYWORD
682     {
683     char near_time_buf[29];
684     png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
685     ptime->day % 32, short_months[(ptime->month - 1) % 12],
686     ptime->year, ptime->hour % 24, ptime->minute % 60,
687     ptime->second % 61);
688     png_memcpy(png_ptr->time_buffer, near_time_buf,
689     29*png_sizeof(char));
690     }
691     #else
692     png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
693     ptime->day % 32, short_months[(ptime->month - 1) % 12],
694     ptime->year, ptime->hour % 24, ptime->minute % 60,
695     ptime->second % 61);
696     #endif
697     #endif /* _WIN32_WCE */
698     return ((png_charp)png_ptr->time_buffer);
699     }
700     #endif /* PNG_TIME_RFC1123_SUPPORTED */
701    
702     #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
703    
704     png_charp PNGAPI
705     png_get_copyright(png_structp png_ptr)
706     {
707     png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
708     return ((png_charp) "\n libpng version 1.2.39 - August 13, 2009\n\
709     Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
710     Copyright (c) 1996-1997 Andreas Dilger\n\
711     Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
712     }
713    
714     /* The following return the library version as a short string in the
715     * format 1.0.0 through 99.99.99zz. To get the version of *.h files
716     * used with your application, print out PNG_LIBPNG_VER_STRING, which
717     * is defined in png.h.
718     * Note: now there is no difference between png_get_libpng_ver() and
719     * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
720     * it is guaranteed that png.c uses the correct version of png.h.
721     */
722     png_charp PNGAPI
723     png_get_libpng_ver(png_structp png_ptr)
724     {
725     /* Version of *.c files used when building libpng */
726     png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
727     return ((png_charp) PNG_LIBPNG_VER_STRING);
728     }
729    
730     png_charp PNGAPI
731     png_get_header_ver(png_structp png_ptr)
732     {
733     /* Version of *.h files used when building libpng */
734     png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
735     return ((png_charp) PNG_LIBPNG_VER_STRING);
736     }
737    
738     png_charp PNGAPI
739     png_get_header_version(png_structp png_ptr)
740     {
741     /* Returns longer string containing both version and date */
742     png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
743     return ((png_charp) PNG_HEADER_VERSION_STRING
744     #ifndef PNG_READ_SUPPORTED
745     " (NO READ SUPPORT)"
746     #endif
747     "\n");
748     }
749    
750     #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
751     #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
752     int PNGAPI
753     png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
754     {
755     /* Check chunk_name and return "keep" value if it's on the list, else 0 */
756     int i;
757     png_bytep p;
758     if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
759     return 0;
760     p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
761     for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
762     if (!png_memcmp(chunk_name, p, 4))
763     return ((int)*(p + 4));
764     return 0;
765     }
766     #endif
767    
768     /* This function, added to libpng-1.0.6g, is untested. */
769     int PNGAPI
770     png_reset_zstream(png_structp png_ptr)
771     {
772     if (png_ptr == NULL)
773     return Z_STREAM_ERROR;
774     return (inflateReset(&png_ptr->zstream));
775     }
776     #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
777    
778     /* This function was added to libpng-1.0.7 */
779     png_uint_32 PNGAPI
780     png_access_version_number(void)
781     {
782     /* Version of *.c files used when building libpng */
783     return((png_uint_32) PNG_LIBPNG_VER);
784     }
785    
786    
787     #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
788     #if !defined(PNG_1_0_X)
789     /* This function was added to libpng 1.2.0 */
790     int PNGAPI
791     png_mmx_support(void)
792     {
793     /* Obsolete, to be removed from libpng-1.4.0 */
794     return -1;
795     }
796     #endif /* PNG_1_0_X */
797     #endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
798    
799     #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
800     #ifdef PNG_SIZE_T
801     /* Added at libpng version 1.2.6 */
802     PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
803     png_size_t PNGAPI
804     png_convert_size(size_t size)
805     {
806     if (size > (png_size_t)-1)
807     PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
808     return ((png_size_t)size);
809     }
810     #endif /* PNG_SIZE_T */
811    
812     /* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
813     #if defined(PNG_cHRM_SUPPORTED)
814     #if !defined(PNG_NO_CHECK_cHRM)
815    
816     /*
817     * Multiply two 32-bit numbers, V1 and V2, using 32-bit
818     * arithmetic, to produce a 64 bit result in the HI/LO words.
819     *
820     * A B
821     * x C D
822     * ------
823     * AD || BD
824     * AC || CB || 0
825     *
826     * where A and B are the high and low 16-bit words of V1,
827     * C and D are the 16-bit words of V2, AD is the product of
828     * A and D, and X || Y is (X << 16) + Y.
829     */
830    
831     void /* PRIVATE */
832     png_64bit_product (long v1, long v2, unsigned long *hi_product,
833     unsigned long *lo_product)
834     {
835     int a, b, c, d;
836     long lo, hi, x, y;
837    
838     a = (v1 >> 16) & 0xffff;
839     b = v1 & 0xffff;
840     c = (v2 >> 16) & 0xffff;
841     d = v2 & 0xffff;
842    
843     lo = b * d; /* BD */
844     x = a * d + c * b; /* AD + CB */
845     y = ((lo >> 16) & 0xffff) + x;
846    
847     lo = (lo & 0xffff) | ((y & 0xffff) << 16);
848     hi = (y >> 16) & 0xffff;
849    
850     hi += a * c; /* AC */
851    
852     *hi_product = (unsigned long)hi;
853     *lo_product = (unsigned long)lo;
854     }
855    
856     int /* PRIVATE */
857     png_check_cHRM_fixed(png_structp png_ptr,
858     png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
859     png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
860     png_fixed_point blue_x, png_fixed_point blue_y)
861     {
862     int ret = 1;
863     unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
864    
865     png_debug(1, "in function png_check_cHRM_fixed");
866     if (png_ptr == NULL)
867     return 0;
868    
869     if (white_x < 0 || white_y <= 0 ||
870     red_x < 0 || red_y < 0 ||
871     green_x < 0 || green_y < 0 ||
872     blue_x < 0 || blue_y < 0)
873     {
874     png_warning(png_ptr,
875     "Ignoring attempt to set negative chromaticity value");
876     ret = 0;
877     }
878     if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
879     white_y > (png_fixed_point) PNG_UINT_31_MAX ||
880     red_x > (png_fixed_point) PNG_UINT_31_MAX ||
881     red_y > (png_fixed_point) PNG_UINT_31_MAX ||
882     green_x > (png_fixed_point) PNG_UINT_31_MAX ||
883     green_y > (png_fixed_point) PNG_UINT_31_MAX ||
884     blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
885     blue_y > (png_fixed_point) PNG_UINT_31_MAX )
886     {
887     png_warning(png_ptr,
888     "Ignoring attempt to set chromaticity value exceeding 21474.83");
889     ret = 0;
890     }
891     if (white_x > 100000L - white_y)
892     {
893     png_warning(png_ptr, "Invalid cHRM white point");
894     ret = 0;
895     }
896     if (red_x > 100000L - red_y)
897     {
898     png_warning(png_ptr, "Invalid cHRM red point");
899     ret = 0;
900     }
901     if (green_x > 100000L - green_y)
902     {
903     png_warning(png_ptr, "Invalid cHRM green point");
904     ret = 0;
905     }
906     if (blue_x > 100000L - blue_y)
907     {
908     png_warning(png_ptr, "Invalid cHRM blue point");
909     ret = 0;
910     }
911    
912     png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
913     png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
914    
915     if (xy_hi == yx_hi && xy_lo == yx_lo)
916     {
917     png_warning(png_ptr,
918     "Ignoring attempt to set cHRM RGB triangle with zero area");
919     ret = 0;
920     }
921    
922     return ret;
923     }
924     #endif /* NO_PNG_CHECK_cHRM */
925     #endif /* PNG_cHRM_SUPPORTED */
926     #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */

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