Context Navigation

← Previous Revision
Latest Revision
Next Revision →
Blame
Revision Log

png.c@ 92

Last change on this file since 92 was 2, checked in by dmik, 20 years ago
Imported xplatform parts of the official release 3.3.1 from Trolltech
Property svn:keywords set to `Id`
File size: 23.1 KB

Line
1
2	/* png.c - location for general purpose libpng functions
3	*
4	* libpng version 1.2.5 - October 3, 2002
5	* Copyright (c) 1998-2002 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	*/
10
11	#define PNG_INTERNAL
12	#define PNG_NO_EXTERN
13	#include "png.h"
14
15	/* Generate a compiler error if there is an old png.h in the search path. */
16	typedef version_1_2_5 Your_png_h_is_not_version_1_2_5;
17
18	/* Version information for C files. This had better match the version
19	* string defined in png.h. */
20
21	#ifdef PNG_USE_GLOBAL_ARRAYS
22	/* png_libpng_ver was changed to a function in version 1.0.5c */
23	const char png_libpng_ver[18] = "1.2.5";
24
25	/* png_sig was changed to a function in version 1.0.5c */
26	/* Place to hold the signature string for a PNG file. */
27	const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
28
29	/* Invoke global declarations for constant strings for known chunk types */
30	PNG_IHDR;
31	PNG_IDAT;
32	PNG_IEND;
33	PNG_PLTE;
34	PNG_bKGD;
35	PNG_cHRM;
36	PNG_gAMA;
37	PNG_hIST;
38	PNG_iCCP;
39	PNG_iTXt;
40	PNG_oFFs;
41	PNG_pCAL;
42	PNG_sCAL;
43	PNG_pHYs;
44	PNG_sBIT;
45	PNG_sPLT;
46	PNG_sRGB;
47	PNG_tEXt;
48	PNG_tIME;
49	PNG_tRNS;
50	PNG_zTXt;
51
52	/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
53
54	/* start of interlace block */
55	const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
56
57	/* offset to next interlace block */
58	const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
59
60	/* start of interlace block in the y direction */
61	const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
62
63	/* offset to next interlace block in the y direction */
64	const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
65
66	/* width of interlace block (used in assembler routines only) */
67	#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
68	const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
69	#endif
70
71	/* Height of interlace block. This is not currently used - if you need
72	* it, uncomment it here and in png.h
73	const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
74	*/
75
76	/* Mask to determine which pixels are valid in a pass */
77	const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
78
79	/* Mask to determine which pixels to overwrite while displaying */
80	const int FARDATA png_pass_dsp_mask[]
81	= {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
82
83	#endif
84
85	/* Tells libpng that we have already handled the first "num_bytes" bytes
86	* of the PNG file signature. If the PNG data is embedded into another
87	* stream we can set num_bytes = 8 so that libpng will not attempt to read
88	* or write any of the magic bytes before it starts on the IHDR.
89	*/
90
91	void PNGAPI
92	png_set_sig_bytes(png_structp png_ptr, int num_bytes)
93	{
94	png_debug(1, "in png_set_sig_bytes\n");
95	if (num_bytes > 8)
96	png_error(png_ptr, "Too many bytes for PNG signature.");
97
98	png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
99	}
100
101	/* Checks whether the supplied bytes match the PNG signature. We allow
102	* checking less than the full 8-byte signature so that those apps that
103	* already read the first few bytes of a file to determine the file type
104	* can simply check the remaining bytes for extra assurance. Returns
105	* an integer less than, equal to, or greater than zero if sig is found,
106	* respectively, to be less than, to match, or be greater than the correct
107	* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
108	*/
109	int PNGAPI
110	png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
111	{
112	png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
113	if (num_to_check > 8)
114	num_to_check = 8;
115	else if (num_to_check < 1)
116	return (0);
117
118	if (start > 7)
119	return (0);
120
121	if (start + num_to_check > 8)
122	num_to_check = 8 - start;
123
124	return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
125	}
126
127	/* (Obsolete) function to check signature bytes. It does not allow one
128	* to check a partial signature. This function might be removed in the
129	* future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
130	*/
131	int PNGAPI
132	png_check_sig(png_bytep sig, int num)
133	{
134	return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
135	}
136
137	/* Function to allocate memory for zlib and clear it to 0. */
138	#ifdef PNG_1_0_X
139	voidpf PNGAPI
140	#else
141	voidpf /* private */
142	#endif
143	png_zalloc(voidpf png_ptr, uInt items, uInt size)
144	{
145	png_uint_32 num_bytes = (png_uint_32)items * size;
146	png_voidp ptr;
147	png_structp p=(png_structp)png_ptr;
148	png_uint_32 save_flags=p->flags;
149
150	p->flags\|=PNG_FLAG_MALLOC_NULL_MEM_OK;
151	ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
152	p->flags=save_flags;
153
154	#ifndef PNG_NO_ZALLOC_ZERO
155	if (ptr == NULL)
156	return ((voidpf)ptr);
157
158	if (num_bytes > (png_uint_32)0x8000L)
159	{
160	png_memset(ptr, 0, (png_size_t)0x8000L);
161	png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
162	(png_size_t)(num_bytes - (png_uint_32)0x8000L));
163	}
164	else
165	{
166	png_memset(ptr, 0, (png_size_t)num_bytes);
167	}
168	#endif
169	return ((voidpf)ptr);
170	}
171
172	/* function to free memory for zlib */
173	#ifdef PNG_1_0_X
174	void PNGAPI
175	#else
176	void /* private */
177	#endif
178	png_zfree(voidpf png_ptr, voidpf ptr)
179	{
180	png_free((png_structp)png_ptr, (png_voidp)ptr);
181	}
182
183	/* Reset the CRC variable to 32 bits of 1's. Care must be taken
184	* in case CRC is > 32 bits to leave the top bits 0.
185	*/
186	void /* PRIVATE */
187	png_reset_crc(png_structp png_ptr)
188	{
189	png_ptr->crc = crc32(0, Z_NULL, 0);
190	}
191
192	/* Calculate the CRC over a section of data. We can only pass as
193	* much data to this routine as the largest single buffer size. We
194	* also check that this data will actually be used before going to the
195	* trouble of calculating it.
196	*/
197	void /* PRIVATE */
198	png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
199	{
200	int need_crc = 1;
201
202	if (png_ptr->chunk_name[0] & 0x20) /* ancillary */
203	{
204	if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) ==
205	(PNG_FLAG_CRC_ANCILLARY_USE \| PNG_FLAG_CRC_ANCILLARY_NOWARN))
206	need_crc = 0;
207	}
208	else /* critical */
209	{
210	if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
211	need_crc = 0;
212	}
213
214	if (need_crc)
215	png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
216	}
217
218	/* Allocate the memory for an info_struct for the application. We don't
219	* really need the png_ptr, but it could potentially be useful in the
220	* future. This should be used in favour of malloc(sizeof(png_info))
221	* and png_info_init() so that applications that want to use a shared
222	* libpng don't have to be recompiled if png_info changes size.
223	*/
224	png_infop PNGAPI
225	png_create_info_struct(png_structp png_ptr)
226	{
227	png_infop info_ptr;
228
229	png_debug(1, "in png_create_info_struct\n");
230	if(png_ptr == NULL) return (NULL);
231	#ifdef PNG_USER_MEM_SUPPORTED
232	info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
233	png_ptr->malloc_fn, png_ptr->mem_ptr);
234	#else
235	info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
236	#endif
237	if (info_ptr != NULL)
238	png_info_init_3(&info_ptr, sizeof(png_info));
239
240	return (info_ptr);
241	}
242
243	/* This function frees the memory associated with a single info struct.
244	* Normally, one would use either png_destroy_read_struct() or
245	* png_destroy_write_struct() to free an info struct, but this may be
246	* useful for some applications.
247	*/
248	void PNGAPI
249	png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
250	{
251	png_infop info_ptr = NULL;
252
253	png_debug(1, "in png_destroy_info_struct\n");
254	if (info_ptr_ptr != NULL)
255	info_ptr = *info_ptr_ptr;
256
257	if (info_ptr != NULL)
258	{
259	png_info_destroy(png_ptr, info_ptr);
260
261	#ifdef PNG_USER_MEM_SUPPORTED
262	png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
263	png_ptr->mem_ptr);
264	#else
265	png_destroy_struct((png_voidp)info_ptr);
266	#endif
267	*info_ptr_ptr = NULL;
268	}
269	}
270
271	/* Initialize the info structure. This is now an internal function (0.89)
272	* and applications using it are urged to use png_create_info_struct()
273	* instead.
274	*/
275	#undef png_info_init
276	void PNGAPI
277	png_info_init(png_infop info_ptr)
278	{
279	/* We only come here via pre-1.0.12-compiled applications */
280	png_info_init_3(&info_ptr, 0);
281	}
282
283	void PNGAPI
284	png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
285	{
286	png_infop info_ptr = *ptr_ptr;
287
288	png_debug(1, "in png_info_init_3\n");
289
290	if(sizeof(png_info) > png_info_struct_size)
291	{
292	png_destroy_struct(info_ptr);
293	info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
294	*ptr_ptr = info_ptr;
295	}
296
297	/* set everything to 0 */
298	png_memset(info_ptr, 0, sizeof (png_info));
299	}
300
301	#ifdef PNG_FREE_ME_SUPPORTED
302	void PNGAPI
303	png_data_freer(png_structp png_ptr, png_infop info_ptr,
304	int freer, png_uint_32 mask)
305	{
306	png_debug(1, "in png_data_freer\n");
307	if (png_ptr == NULL \|\| info_ptr == NULL)
308	return;
309	if(freer == PNG_DESTROY_WILL_FREE_DATA)
310	info_ptr->free_me \|= mask;
311	else if(freer == PNG_USER_WILL_FREE_DATA)
312	info_ptr->free_me &= ~mask;
313	else
314	png_warning(png_ptr,
315	"Unknown freer parameter in png_data_freer.");
316	}
317	#endif
318
319	void PNGAPI
320	png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
321	int num)
322	{
323	png_debug(1, "in png_free_data\n");
324	if (png_ptr == NULL \|\| info_ptr == NULL)
325	return;
326
327	#if defined(PNG_TEXT_SUPPORTED)
328	/* free text item num or (if num == -1) all text items */
329	#ifdef PNG_FREE_ME_SUPPORTED
330	if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
331	#else
332	if (mask & PNG_FREE_TEXT)
333	#endif
334	{
335	if (num != -1)
336	{
337	if (info_ptr->text && info_ptr->text[num].key)
338	{
339	png_free(png_ptr, info_ptr->text[num].key);
340	info_ptr->text[num].key = NULL;
341	}
342	}
343	else
344	{
345	int i;
346	for (i = 0; i < info_ptr->num_text; i++)
347	png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
348	png_free(png_ptr, info_ptr->text);
349	info_ptr->text = NULL;
350	info_ptr->num_text=0;
351	}
352	}
353	#endif
354
355	#if defined(PNG_tRNS_SUPPORTED)
356	/* free any tRNS entry */
357	#ifdef PNG_FREE_ME_SUPPORTED
358	if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
359	#else
360	if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
361	#endif
362	{
363	png_free(png_ptr, info_ptr->trans);
364	info_ptr->valid &= ~PNG_INFO_tRNS;
365	#ifndef PNG_FREE_ME_SUPPORTED
366	png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
367	#endif
368	info_ptr->trans = NULL;
369	}
370	#endif
371
372	#if defined(PNG_sCAL_SUPPORTED)
373	/* free any sCAL entry */
374	#ifdef PNG_FREE_ME_SUPPORTED
375	if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
376	#else
377	if (mask & PNG_FREE_SCAL)
378	#endif
379	{
380	#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
381	png_free(png_ptr, info_ptr->scal_s_width);
382	png_free(png_ptr, info_ptr->scal_s_height);
383	info_ptr->scal_s_width = NULL;
384	info_ptr->scal_s_height = NULL;
385	#endif
386	info_ptr->valid &= ~PNG_INFO_sCAL;
387	}
388	#endif
389
390	#if defined(PNG_pCAL_SUPPORTED)
391	/* free any pCAL entry */
392	#ifdef PNG_FREE_ME_SUPPORTED
393	if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
394	#else
395	if (mask & PNG_FREE_PCAL)
396	#endif
397	{
398	png_free(png_ptr, info_ptr->pcal_purpose);
399	png_free(png_ptr, info_ptr->pcal_units);
400	info_ptr->pcal_purpose = NULL;
401	info_ptr->pcal_units = NULL;
402	if (info_ptr->pcal_params != NULL)
403	{
404	int i;
405	for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
406	{
407	png_free(png_ptr, info_ptr->pcal_params[i]);
408	info_ptr->pcal_params[i]=NULL;
409	}
410	png_free(png_ptr, info_ptr->pcal_params);
411	info_ptr->pcal_params = NULL;
412	}
413	info_ptr->valid &= ~PNG_INFO_pCAL;
414	}
415	#endif
416
417	#if defined(PNG_iCCP_SUPPORTED)
418	/* free any iCCP entry */
419	#ifdef PNG_FREE_ME_SUPPORTED
420	if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
421	#else
422	if (mask & PNG_FREE_ICCP)
423	#endif
424	{
425	png_free(png_ptr, info_ptr->iccp_name);
426	png_free(png_ptr, info_ptr->iccp_profile);
427	info_ptr->iccp_name = NULL;
428	info_ptr->iccp_profile = NULL;
429	info_ptr->valid &= ~PNG_INFO_iCCP;
430	}
431	#endif
432
433	#if defined(PNG_sPLT_SUPPORTED)
434	/* free a given sPLT entry, or (if num == -1) all sPLT entries */
435	#ifdef PNG_FREE_ME_SUPPORTED
436	if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
437	#else
438	if (mask & PNG_FREE_SPLT)
439	#endif
440	{
441	if (num != -1)
442	{
443	if(info_ptr->splt_palettes)
444	{
445	png_free(png_ptr, info_ptr->splt_palettes[num].name);
446	png_free(png_ptr, info_ptr->splt_palettes[num].entries);
447	info_ptr->splt_palettes[num].name = NULL;
448	info_ptr->splt_palettes[num].entries = NULL;
449	}
450	}
451	else
452	{
453	if(info_ptr->splt_palettes_num)
454	{
455	int i;
456	for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
457	png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
458
459	png_free(png_ptr, info_ptr->splt_palettes);
460	info_ptr->splt_palettes = NULL;
461	info_ptr->splt_palettes_num = 0;
462	}
463	info_ptr->valid &= ~PNG_INFO_sPLT;
464	}
465	}
466	#endif
467
468	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
469	#ifdef PNG_FREE_ME_SUPPORTED
470	if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
471	#else
472	if (mask & PNG_FREE_UNKN)
473	#endif
474	{
475	if (num != -1)
476	{
477	if(info_ptr->unknown_chunks)
478	{
479	png_free(png_ptr, info_ptr->unknown_chunks[num].data);
480	info_ptr->unknown_chunks[num].data = NULL;
481	}
482	}
483	else
484	{
485	int i;
486
487	if(info_ptr->unknown_chunks_num)
488	{
489	for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
490	png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
491
492	png_free(png_ptr, info_ptr->unknown_chunks);
493	info_ptr->unknown_chunks = NULL;
494	info_ptr->unknown_chunks_num = 0;
495	}
496	}
497	}
498	#endif
499
500	#if defined(PNG_hIST_SUPPORTED)
501	/* free any hIST entry */
502	#ifdef PNG_FREE_ME_SUPPORTED
503	if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
504	#else
505	if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
506	#endif
507	{
508	png_free(png_ptr, info_ptr->hist);
509	info_ptr->hist = NULL;
510	info_ptr->valid &= ~PNG_INFO_hIST;
511	#ifndef PNG_FREE_ME_SUPPORTED
512	png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
513	#endif
514	}
515	#endif
516
517	/* free any PLTE entry that was internally allocated */
518	#ifdef PNG_FREE_ME_SUPPORTED
519	if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
520	#else
521	if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
522	#endif
523	{
524	png_zfree(png_ptr, info_ptr->palette);
525	info_ptr->palette = NULL;
526	info_ptr->valid &= ~PNG_INFO_PLTE;
527	#ifndef PNG_FREE_ME_SUPPORTED
528	png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
529	#endif
530	info_ptr->num_palette = 0;
531	}
532
533	#if defined(PNG_INFO_IMAGE_SUPPORTED)
534	/* free any image bits attached to the info structure */
535	#ifdef PNG_FREE_ME_SUPPORTED
536	if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
537	#else
538	if (mask & PNG_FREE_ROWS)
539	#endif
540	{
541	if(info_ptr->row_pointers)
542	{
543	int row;
544	for (row = 0; row < (int)info_ptr->height; row++)
545	{
546	png_free(png_ptr, info_ptr->row_pointers[row]);
547	info_ptr->row_pointers[row]=NULL;
548	}
549	png_free(png_ptr, info_ptr->row_pointers);
550	info_ptr->row_pointers=NULL;
551	}
552	info_ptr->valid &= ~PNG_INFO_IDAT;
553	}
554	#endif
555
556	#ifdef PNG_FREE_ME_SUPPORTED
557	if(num == -1)
558	info_ptr->free_me &= ~mask;
559	else
560	info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
561	#endif
562	}
563
564	/* This is an internal routine to free any memory that the info struct is
565	* pointing to before re-using it or freeing the struct itself. Recall
566	* that png_free() checks for NULL pointers for us.
567	*/
568	void /* PRIVATE */
569	png_info_destroy(png_structp png_ptr, png_infop info_ptr)
570	{
571	png_debug(1, "in png_info_destroy\n");
572
573	png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
574
575	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
576	if (png_ptr->num_chunk_list)
577	{
578	png_free(png_ptr, png_ptr->chunk_list);
579	png_ptr->chunk_list=NULL;
580	png_ptr->num_chunk_list=0;
581	}
582	#endif
583
584	png_info_init_3(&info_ptr, sizeof(png_info));
585	}
586
587	/* This function returns a pointer to the io_ptr associated with the user
588	* functions. The application should free any memory associated with this
589	* pointer before png_write_destroy() or png_read_destroy() are called.
590	*/
591	png_voidp PNGAPI
592	png_get_io_ptr(png_structp png_ptr)
593	{
594	return (png_ptr->io_ptr);
595	}
596
597	#if !defined(PNG_NO_STDIO)
598	/* Initialize the default input/output functions for the PNG file. If you
599	* use your own read or write routines, you can call either png_set_read_fn()
600	* or png_set_write_fn() instead of png_init_io(). If you have defined
601	* PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
602	* necessarily available.
603	*/
604	void PNGAPI
605	png_init_io(png_structp png_ptr, png_FILE_p fp)
606	{
607	png_debug(1, "in png_init_io\n");
608	png_ptr->io_ptr = (png_voidp)fp;
609	}
610	#endif
611
612	#if defined(PNG_TIME_RFC1123_SUPPORTED)
613	/* Convert the supplied time into an RFC 1123 string suitable for use in
614	* a "Creation Time" or other text-based time string.
615	*/
616	png_charp PNGAPI
617	png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
618	{
619	static PNG_CONST char short_months[12][4] =
620	{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
621	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
622
623	if (png_ptr->time_buffer == NULL)
624	{
625	png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
626	sizeof(char)));
627	}
628
629	#if defined(_WIN32_WCE)
630	{
631	wchar_t time_buf[29];
632	wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
633	ptime->day % 32, short_months[(ptime->month - 1) % 12],
634	ptime->year, ptime->hour % 24, ptime->minute % 60,
635	ptime->second % 61);
636	WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
637	NULL, NULL);
638	}
639	#else
640	#ifdef USE_FAR_KEYWORD
641	{
642	char near_time_buf[29];
643	sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
644	ptime->day % 32, short_months[(ptime->month - 1) % 12],
645	ptime->year, ptime->hour % 24, ptime->minute % 60,
646	ptime->second % 61);
647	png_memcpy(png_ptr->time_buffer, near_time_buf,
648	29*sizeof(char));
649	}
650	#else
651	sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
652	ptime->day % 32, short_months[(ptime->month - 1) % 12],
653	ptime->year, ptime->hour % 24, ptime->minute % 60,
654	ptime->second % 61);
655	#endif
656	#endif /* _WIN32_WCE */
657	return ((png_charp)png_ptr->time_buffer);
658	}
659	#endif /* PNG_TIME_RFC1123_SUPPORTED */
660
661	#if 0
662	/* Signature string for a PNG file. */
663	png_bytep PNGAPI
664	png_sig_bytes(void)
665	{
666	return ((png_bytep)"\211\120\116\107\015\012\032\012");
667	}
668	#endif
669
670	png_charp PNGAPI
671	png_get_copyright(png_structp png_ptr)
672	{
673	if (png_ptr != NULL \|\| png_ptr == NULL) /* silence compiler warning */
674	return ((png_charp) "\n libpng version 1.2.5 - October 3, 2002\n\
675	Copyright (c) 1998-2002 Glenn Randers-Pehrson\n\
676	Copyright (c) 1996-1997 Andreas Dilger\n\
677	Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
678	return ((png_charp) "");
679	}
680
681	/* The following return the library version as a short string in the
682	* format 1.0.0 through 99.99.99zz. To get the version of *.h files used
683	* with your application, print out PNG_LIBPNG_VER_STRING, which is defined
684	* in png.h.
685	*/
686
687	png_charp PNGAPI
688	png_get_libpng_ver(png_structp png_ptr)
689	{
690	/* Version of .c files used when building libpng /
691	if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
692	return((png_charp) "1.2.5");
693	return((png_charp) "1.2.5");
694	}
695
696	png_charp PNGAPI
697	png_get_header_ver(png_structp png_ptr)
698	{
699	/* Version of .h files used when building libpng /
700	if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
701	return((png_charp) PNG_LIBPNG_VER_STRING);
702	return((png_charp) PNG_LIBPNG_VER_STRING);
703	}
704
705	png_charp PNGAPI
706	png_get_header_version(png_structp png_ptr)
707	{
708	/* Returns longer string containing both version and date */
709	if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
710	return((png_charp) PNG_HEADER_VERSION_STRING);
711	return((png_charp) PNG_HEADER_VERSION_STRING);
712	}
713
714	#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
715	int PNGAPI
716	png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
717	{
718	/* check chunk_name and return "keep" value if it's on the list, else 0 */
719	int i;
720	png_bytep p;
721	if((png_ptr == NULL && chunk_name == NULL) \|\| png_ptr->num_chunk_list<=0)
722	return 0;
723	p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
724	for (i = png_ptr->num_chunk_list; i; i--, p-=5)
725	if (!png_memcmp(chunk_name, p, 4))
726	return ((int)*(p+4));
727	return 0;
728	}
729	#endif
730
731	/* This function, added to libpng-1.0.6g, is untested. */
732	int PNGAPI
733	png_reset_zstream(png_structp png_ptr)
734	{
735	return (inflateReset(&png_ptr->zstream));
736	}
737
738	/* This function was added to libpng-1.0.7 */
739	png_uint_32 PNGAPI
740	png_access_version_number(void)
741	{
742	/* Version of .c files used when building libpng /
743	return((png_uint_32) 10205L);
744	}
745
746
747	#if !defined(PNG_1_0_X)
748	#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
749	/* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
750	/* this INTERNAL function was added to libpng 1.2.0 */
751	void /* PRIVATE */
752	png_init_mmx_flags (png_structp png_ptr)
753	{
754	png_ptr->mmx_rowbytes_threshold = 0;
755	png_ptr->mmx_bitdepth_threshold = 0;
756
757	# if (defined(PNG_USE_PNGVCRD) \|\| defined(PNG_USE_PNGGCCRD))
758
759	png_ptr->asm_flags \|= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
760
761	if (png_mmx_support() > 0) {
762	png_ptr->asm_flags \|= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
763	# ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
764	\| PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
765	# endif
766	# ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
767	\| PNG_ASM_FLAG_MMX_READ_INTERLACE
768	# endif
769	# ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
770	;
771	# else
772	\| PNG_ASM_FLAG_MMX_READ_FILTER_SUB
773	\| PNG_ASM_FLAG_MMX_READ_FILTER_UP
774	\| PNG_ASM_FLAG_MMX_READ_FILTER_AVG
775	\| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
776
777	png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
778	png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
779	# endif
780	} else {
781	png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
782	\| PNG_MMX_READ_FLAGS
783	\| PNG_MMX_WRITE_FLAGS );
784	}
785
786	# else /* !((PNGVCRD \|\| PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
787
788	/* clear all MMX flags; no support is compiled in */
789	png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
790
791	# endif /* ?(PNGVCRD \|\| PNGGCCRD) */
792	}
793
794	#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
795
796	/* this function was added to libpng 1.2.0 */
797	#if !defined(PNG_USE_PNGGCCRD) && \
798	!(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
799	int PNGAPI
800	png_mmx_support(void)
801	{
802	return -1;
803	}
804	#endif
805	#endif /* PNG_1_0_X */

Note: See TracBrowser for help on using the repository browser.

Context Navigation

source: trunk/src/3rdparty/libpng/png.c@ 92

Download in other formats: