[wxWidgets.git] / src / png / pngerror.c


/* pngerror.c - stub functions for i/o and memory allocation
 *
 * Last changed in libpng 1.2.20 September 8, 2007
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998-2007 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * This file provides a location for all error handling.  Users who
 * need special error handling are expected to write replacement functions
 * and use png_set_error_fn() to use those functions.  See the instructions
 * at each function.
 */

#define PNG_INTERNAL
#include "png.h"

#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
static void /* PRIVATE */
png_default_error PNGARG((png_structp png_ptr,
  png_const_charp error_message));
#ifndef PNG_NO_WARNINGS
static void /* PRIVATE */
png_default_warning PNGARG((png_structp png_ptr,
  png_const_charp warning_message));
#endif /* PNG_NO_WARNINGS */

/* This function is called whenever there is a fatal error.  This function
 * should not be changed.  If there is a need to handle errors differently,
 * you should supply a replacement error function and use png_set_error_fn()
 * to replace the error function at run-time.
 */
#ifndef PNG_NO_ERROR_TEXT
void PNGAPI
png_error(png_structp png_ptr, png_const_charp error_message)
{
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
   char msg[16];
   if (png_ptr != NULL)
   {
     if (png_ptr->flags&
       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
     {
       if (*error_message == '#')
       {
           int offset;
           for (offset=1; offset<15; offset++)
              if (*(error_message+offset) == ' ')
                  break;
           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
           {
              int i;
              for (i=0; i<offset-1; i++)
                 msg[i]=error_message[i+1];
              msg[i]='\0';
              error_message=msg;
           }
           else
              error_message+=offset;
       }
       else
       {
           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
           {
              msg[0]='0';
              msg[1]='\0';
              error_message=msg;
           }
       }
     }
   }
#endif
   if (png_ptr != NULL && png_ptr->error_fn != NULL)
      (*(png_ptr->error_fn))(png_ptr, error_message);

   /* If the custom handler doesn't exist, or if it returns,
      use the default handler, which will not return. */
   png_default_error(png_ptr, error_message);
}
#else
void PNGAPI
png_err(png_structp png_ptr)
{
   if (png_ptr != NULL && png_ptr->error_fn != NULL)
      (*(png_ptr->error_fn))(png_ptr, '\0');

   /* If the custom handler doesn't exist, or if it returns,
      use the default handler, which will not return. */
   png_default_error(png_ptr, '\0');
}
#endif /* PNG_NO_ERROR_TEXT */

#ifndef PNG_NO_WARNINGS
/* This function is called whenever there is a non-fatal error.  This function
 * should not be changed.  If there is a need to handle warnings differently,
 * you should supply a replacement warning function and use
 * png_set_error_fn() to replace the warning function at run-time.
 */
void PNGAPI
png_warning(png_structp png_ptr, png_const_charp warning_message)
{
   int offset = 0;
   if (png_ptr != NULL)
   {
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
   if (png_ptr->flags&
     (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
#endif
     {
       if (*warning_message == '#')
       {
           for (offset=1; offset<15; offset++)
              if (*(warning_message+offset) == ' ')
                  break;
       }
     }
     if (png_ptr != NULL && png_ptr->warning_fn != NULL)
        (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
   }
   else
      png_default_warning(png_ptr, warning_message+offset);
}
#endif /* PNG_NO_WARNINGS */


/* These utilities are used internally to build an error message that relates
 * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
 * this is used to prefix the message.  The message is limited in length
 * to 63 bytes, the name characters are output as hex digits wrapped in []
 * if the character is invalid.
 */
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
static PNG_CONST char png_digit[16] = {
   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
   'A', 'B', 'C', 'D', 'E', 'F'
};

#if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
static void /* PRIVATE */
png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
   error_message)
{
   int iout = 0, iin = 0;

   while (iin < 4)
   {
      int c = png_ptr->chunk_name[iin++];
      if (isnonalpha(c))
      {
         buffer[iout++] = '[';
         buffer[iout++] = png_digit[(c & 0xf0) >> 4];
         buffer[iout++] = png_digit[c & 0x0f];
         buffer[iout++] = ']';
      }
      else
      {
         buffer[iout++] = (png_byte)c;
      }
   }

   if (error_message == NULL)
      buffer[iout] = 0;
   else
   {
      buffer[iout++] = ':';
      buffer[iout++] = ' ';
      png_strncpy(buffer+iout, error_message, 63);
      buffer[iout+63] = 0;
   }
}

#ifdef PNG_READ_SUPPORTED
void PNGAPI
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
   char msg[18+64];
   if (png_ptr == NULL)
     png_error(png_ptr, error_message);
   else
   {
     png_format_buffer(png_ptr, msg, error_message);
     png_error(png_ptr, msg);
   }
}
#endif /* PNG_READ_SUPPORTED */
#endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */

#ifndef PNG_NO_WARNINGS
void PNGAPI
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
   char msg[18+64];
   if (png_ptr == NULL)
     png_warning(png_ptr, warning_message);
   else
   {
     png_format_buffer(png_ptr, msg, warning_message);
     png_warning(png_ptr, msg);
   }
}
#endif /* PNG_NO_WARNINGS */


/* This is the default error handling function.  Note that replacements for
 * this function MUST NOT RETURN, or the program will likely crash.  This
 * function is used by default, or if the program supplies NULL for the
 * error function pointer in png_set_error_fn().
 */
static void /* PRIVATE */
png_default_error(png_structp png_ptr, png_const_charp error_message)
{
#ifndef PNG_NO_CONSOLE_IO
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
   if (*error_message == '#')
   {
     int offset;
     char error_number[16];
     for (offset=0; offset<15; offset++)
     {
         error_number[offset] = *(error_message+offset+1);
         if (*(error_message+offset) == ' ')
             break;
     }
     if((offset > 1) && (offset < 15))
     {
       error_number[offset-1]='\0';
       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
          error_message+offset);
     }
     else
       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
   }
   else
#endif
   fprintf(stderr, "libpng error: %s\n", error_message);
#endif

#ifdef PNG_SETJMP_SUPPORTED
   if (png_ptr)
   {
#  ifdef USE_FAR_KEYWORD
   {
      jmp_buf jmpbuf;
      png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
      longjmp(jmpbuf, 1);
   }
#  else
   longjmp(png_ptr->jmpbuf, 1);
#  endif
   }
#else
   PNG_ABORT();
#endif
#ifdef PNG_NO_CONSOLE_IO
   error_message = error_message; /* make compiler happy */
#endif
}

#ifndef PNG_NO_WARNINGS
/* This function is called when there is a warning, but the library thinks
 * it can continue anyway.  Replacement functions don't have to do anything
 * here if you don't want them to.  In the default configuration, png_ptr is
 * not used, but it is passed in case it may be useful.
 */
static void /* PRIVATE */
png_default_warning(png_structp png_ptr, png_const_charp warning_message)
{
#ifndef PNG_NO_CONSOLE_IO
#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
   if (*warning_message == '#')
   {
     int offset;
     char warning_number[16];
     for (offset=0; offset<15; offset++)
     {
        warning_number[offset]=*(warning_message+offset+1);
        if (*(warning_message+offset) == ' ')
            break;
     }
     if((offset > 1) && (offset < 15))
     {
       warning_number[offset-1]='\0';
       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
          warning_message+offset);
     }
     else
       fprintf(stderr, "libpng warning: %s\n", warning_message);
   }
   else
#  endif
     fprintf(stderr, "libpng warning: %s\n", warning_message);
#else
   warning_message = warning_message; /* make compiler happy */
#endif
   png_ptr = png_ptr; /* make compiler happy */
}
#endif /* PNG_NO_WARNINGS */

/* This function is called when the application wants to use another method
 * of handling errors and warnings.  Note that the error function MUST NOT
 * return to the calling routine or serious problems will occur.  The return
 * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
 */
void PNGAPI
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
   png_error_ptr error_fn, png_error_ptr warning_fn)
{
   if (png_ptr == NULL)
      return;
   png_ptr->error_ptr = error_ptr;
   png_ptr->error_fn = error_fn;
   png_ptr->warning_fn = warning_fn;
}


/* This function returns a pointer to the error_ptr associated with the user
 * functions.  The application should free any memory associated with this
 * pointer before png_write_destroy and png_read_destroy are called.
 */
png_voidp PNGAPI
png_get_error_ptr(png_structp png_ptr)
{
   if (png_ptr == NULL)
      return NULL;
   return ((png_voidp)png_ptr->error_ptr);
}


#ifdef PNG_ERROR_NUMBERS_SUPPORTED
void PNGAPI
png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
{
   if(png_ptr != NULL)
   {
     png_ptr->flags &=
       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
   }
}
#endif
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
Commit	Line	Data
0272a10d VZ	1
	2	/* pngerror.c - stub functions for i/o and memory allocation
	3	*
	4	* Last changed in libpng 1.2.20 September 8, 2007
	5	* For conditions of distribution and use, see copyright notice in png.h
	6	* Copyright (c) 1998-2007 Glenn Randers-Pehrson
	7	* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
	8	* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
	9	*
	10	* This file provides a location for all error handling. Users who
	11	* need special error handling are expected to write replacement functions
	12	* and use png_set_error_fn() to use those functions. See the instructions
	13	* at each function.
	14	*/
	15
	16	#define PNG_INTERNAL
	17	#include "png.h"
	18
	19	#if defined(PNG_READ_SUPPORTED) \|\| defined(PNG_WRITE_SUPPORTED)
	20	static void /* PRIVATE */
	21	png_default_error PNGARG((png_structp png_ptr,
	22	png_const_charp error_message));
	23	#ifndef PNG_NO_WARNINGS
	24	static void /* PRIVATE */
	25	png_default_warning PNGARG((png_structp png_ptr,
	26	png_const_charp warning_message));
	27	#endif /* PNG_NO_WARNINGS */
	28
	29	/* This function is called whenever there is a fatal error. This function
	30	* should not be changed. If there is a need to handle errors differently,
	31	* you should supply a replacement error function and use png_set_error_fn()
	32	* to replace the error function at run-time.
	33	*/
	34	#ifndef PNG_NO_ERROR_TEXT
	35	void PNGAPI
	36	png_error(png_structp png_ptr, png_const_charp error_message)
	37	{
	38	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	39	char msg[16];
	40	if (png_ptr != NULL)
	41	{
	42	if (png_ptr->flags&
	43	(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))
	44	{
	45	if (*error_message == '#')
	46	{
	47	int offset;
	48	for (offset=1; offset<15; offset++)
	49	if (*(error_message+offset) == ' ')
	50	break;
	51	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
	52	{
	53	int i;
	54	for (i=0; i<offset-1; i++)
	55	msg[i]=error_message[i+1];
	56	msg[i]='\0';
	57	error_message=msg;
	58	}
	59	else
	60	error_message+=offset;
	61	}
	62	else
	63	{
	64	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
65	{
66	msg[0]='0';
67	msg[1]='\0';
68	error_message=msg;
69	}
70	}
71	}
72	}
73	#endif
74	if (png_ptr != NULL && png_ptr->error_fn != NULL)
75	(*(png_ptr->error_fn))(png_ptr, error_message);
76
77	/* If the custom handler doesn't exist, or if it returns,
78	use the default handler, which will not return. */
79	png_default_error(png_ptr, error_message);
80	}
81	#else
82	void PNGAPI
83	png_err(png_structp png_ptr)
84	{
85	if (png_ptr != NULL && png_ptr->error_fn != NULL)
86	(*(png_ptr->error_fn))(png_ptr, '\0');
87
88	/* If the custom handler doesn't exist, or if it returns,
89	use the default handler, which will not return. */
90	png_default_error(png_ptr, '\0');
91	}
92	#endif /* PNG_NO_ERROR_TEXT */
93
94	#ifndef PNG_NO_WARNINGS
95	/* This function is called whenever there is a non-fatal error. This function
96	* should not be changed. If there is a need to handle warnings differently,
97	* you should supply a replacement warning function and use
98	* png_set_error_fn() to replace the warning function at run-time.
99	*/
100	void PNGAPI
101	png_warning(png_structp png_ptr, png_const_charp warning_message)
102	{
103	int offset = 0;
104	if (png_ptr != NULL)
105	{
106	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
107	if (png_ptr->flags&
108	(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))
109	#endif
110	{
111	if (*warning_message == '#')
112	{
113	for (offset=1; offset<15; offset++)
114	if (*(warning_message+offset) == ' ')
115	break;
116	}
117	}
118	if (png_ptr != NULL && png_ptr->warning_fn != NULL)
119	(*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
120	}
121	else
122	png_default_warning(png_ptr, warning_message+offset);
123	}
124	#endif /* PNG_NO_WARNINGS */
125
126
127	/* These utilities are used internally to build an error message that relates
128	* to the current chunk. The chunk name comes from png_ptr->chunk_name,
129	* this is used to prefix the message. The message is limited in length
130	* to 63 bytes, the name characters are output as hex digits wrapped in []
131	* if the character is invalid.
132	*/
133	#define isnonalpha(c) ((c) < 65 \|\| (c) > 122 \|\| ((c) > 90 && (c) < 97))
134	static PNG_CONST char png_digit[16] = {
135	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
136	'A', 'B', 'C', 'D', 'E', 'F'
137	};
138
139	#if !defined(PNG_NO_WARNINGS) \|\| !defined(PNG_NO_ERROR_TEXT)
140	static void /* PRIVATE */
141	png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
142	error_message)
143	{
144	int iout = 0, iin = 0;
145
146	while (iin < 4)
147	{
148	int c = png_ptr->chunk_name[iin++];
149	if (isnonalpha(c))
150	{
151	buffer[iout++] = '[';
152	buffer[iout++] = png_digit[(c & 0xf0) >> 4];
153	buffer[iout++] = png_digit[c & 0x0f];
154	buffer[iout++] = ']';
155	}
156	else
157	{
158	buffer[iout++] = (png_byte)c;
159	}
160	}
161
162	if (error_message == NULL)
163	buffer[iout] = 0;
164	else
165	{
166	buffer[iout++] = ':';
167	buffer[iout++] = ' ';
168	png_strncpy(buffer+iout, error_message, 63);
169	buffer[iout+63] = 0;
170	}
171	}
172
173	#ifdef PNG_READ_SUPPORTED
174	void PNGAPI
175	png_chunk_error(png_structp png_ptr, png_const_charp error_message)
176	{
177	char msg[18+64];
178	if (png_ptr == NULL)
179	png_error(png_ptr, error_message);
180	else
181	{
182	png_format_buffer(png_ptr, msg, error_message);
183	png_error(png_ptr, msg);
184	}
185	}
186	#endif /* PNG_READ_SUPPORTED */
187	#endif /* !defined(PNG_NO_WARNINGS) \|\| !defined(PNG_NO_ERROR_TEXT) */
188
189	#ifndef PNG_NO_WARNINGS
190	void PNGAPI
191	png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
192	{
193	char msg[18+64];
194	if (png_ptr == NULL)
195	png_warning(png_ptr, warning_message);
196	else
197	{
198	png_format_buffer(png_ptr, msg, warning_message);
199	png_warning(png_ptr, msg);
200	}
201	}
202	#endif /* PNG_NO_WARNINGS */
203
204
205	/* This is the default error handling function. Note that replacements for
206	* this function MUST NOT RETURN, or the program will likely crash. This
207	* function is used by default, or if the program supplies NULL for the
208	* error function pointer in png_set_error_fn().
209	*/
210	static void /* PRIVATE */
211	png_default_error(png_structp png_ptr, png_const_charp error_message)
212	{
213	#ifndef PNG_NO_CONSOLE_IO
214	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
215	if (*error_message == '#')
216	{
217	int offset;
218	char error_number[16];
219	for (offset=0; offset<15; offset++)
220	{
221	error_number[offset] = *(error_message+offset+1);
222	if (*(error_message+offset) == ' ')
223	break;
224	}
225	if((offset > 1) && (offset < 15))
226	{
227	error_number[offset-1]='\0';
228	fprintf(stderr, "libpng error no. %s: %s\n", error_number,
229	error_message+offset);
230	}
231	else
232	fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
233	}
234	else
235	#endif
236	fprintf(stderr, "libpng error: %s\n", error_message);
237	#endif
238
239	#ifdef PNG_SETJMP_SUPPORTED
240	if (png_ptr)
241	{
242	# ifdef USE_FAR_KEYWORD
243	{
244	jmp_buf jmpbuf;
245	png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
246	longjmp(jmpbuf, 1);
247	}
248	# else
249	longjmp(png_ptr->jmpbuf, 1);
250	# endif
251	}
252	#else
253	PNG_ABORT();
254	#endif
255	#ifdef PNG_NO_CONSOLE_IO
256	error_message = error_message; /* make compiler happy */
257	#endif
258	}
259
260	#ifndef PNG_NO_WARNINGS
261	/* This function is called when there is a warning, but the library thinks
262	* it can continue anyway. Replacement functions don't have to do anything
263	* here if you don't want them to. In the default configuration, png_ptr is
264	* not used, but it is passed in case it may be useful.
265	*/
266	static void /* PRIVATE */
267	png_default_warning(png_structp png_ptr, png_const_charp warning_message)
268	{
269	#ifndef PNG_NO_CONSOLE_IO
270	# ifdef PNG_ERROR_NUMBERS_SUPPORTED
271	if (*warning_message == '#')
272	{
273	int offset;
274	char warning_number[16];
275	for (offset=0; offset<15; offset++)
276	{
277	warning_number[offset]=*(warning_message+offset+1);
278	if (*(warning_message+offset) == ' ')
279	break;
280	}
281	if((offset > 1) && (offset < 15))
282	{
283	warning_number[offset-1]='\0';
284	fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
285	warning_message+offset);
286	}
287	else
288	fprintf(stderr, "libpng warning: %s\n", warning_message);
289	}
290	else
291	# endif
292	fprintf(stderr, "libpng warning: %s\n", warning_message);
293	#else
294	warning_message = warning_message; /* make compiler happy */
295	#endif
296	png_ptr = png_ptr; /* make compiler happy */
297	}
298	#endif /* PNG_NO_WARNINGS */
299
300	/* This function is called when the application wants to use another method
301	* of handling errors and warnings. Note that the error function MUST NOT
302	* return to the calling routine or serious problems will occur. The return
303	* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
304	*/
305	void PNGAPI
306	png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
307	png_error_ptr error_fn, png_error_ptr warning_fn)
308	{
309	if (png_ptr == NULL)
310	return;
311	png_ptr->error_ptr = error_ptr;
312	png_ptr->error_fn = error_fn;
313	png_ptr->warning_fn = warning_fn;
314	}
315
316
317	/* This function returns a pointer to the error_ptr associated with the user
318	* functions. The application should free any memory associated with this
319	* pointer before png_write_destroy and png_read_destroy are called.
320	*/
321	png_voidp PNGAPI
322	png_get_error_ptr(png_structp png_ptr)
323	{
324	if (png_ptr == NULL)
325	return NULL;
326	return ((png_voidp)png_ptr->error_ptr);
327	}
328
329
330	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
331	void PNGAPI
332	png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
333	{
334	if(png_ptr != NULL)
335	{
336	png_ptr->flags &=
337	((~(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
338	}
339	}
340	#endif
341	#endif /* PNG_READ_SUPPORTED \|\| PNG_WRITE_SUPPORTED */