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


/* pngerror.c - stub functions for i/o and memory allocation
 *
 * Last changed in libpng 1.2.34 [December 18, 2008]
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998-2008 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 == '#')
       {
         /* Strip "#nnnn " from beginning of 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 - 1] = '\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'
};

#define PNG_MAX_ERROR_TEXT 64

#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_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
      buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
   }
}

#ifdef PNG_READ_SUPPORTED
void PNGAPI
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
   char msg[18+PNG_MAX_ERROR_TEXT];
   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+PNG_MAX_ERROR_TEXT];
   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 == '#')
   {
     /* Strip "#nnnn " from beginning of warning 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 + 1);
     }
     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	*
970f6abe	4	* Last changed in libpng 1.2.34 [December 18, 2008]
0272a10d	5	* For conditions of distribution and use, see copyright notice in png.h
970f6abe	6	* Copyright (c) 1998-2008 Glenn Randers-Pehrson
0272a10d VZ	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"
0272a10d	18	#if defined(PNG_READ_SUPPORTED) \|\| defined(PNG_WRITE_SUPPORTED)
970f6abe	19
0272a10d VZ	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	{
970f6abe	47	/* Strip "#nnnn " from beginning of error message. */
0272a10d	48	int offset;
970f6abe VZ	49	for (offset = 1; offset<15; offset++)
970f6abe VZ	50	if (error_message[offset] == ' ')
0272a10d VZ	51	break;
	52	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
	53	{
	54	int i;
970f6abe VZ	55	for (i = 0; i < offset - 1; i++)
	56	msg[i] = error_message[i + 1];
	57	msg[i - 1] = '\0';
	58	error_message = msg;
0272a10d VZ	59	}
0272a10d VZ	60	else
970f6abe	61	error_message += offset;
0272a10d VZ	62	}
	63	else
	64	{
	65	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
	66	{
970f6abe VZ	67	msg[0] = '0';
	68	msg[1] = '\0';
	69	error_message = msg;
0272a10d VZ	70	}
	71	}
	72	}
	73	}
	74	#endif
	75	if (png_ptr != NULL && png_ptr->error_fn != NULL)
	76	(*(png_ptr->error_fn))(png_ptr, error_message);
	77
	78	/* If the custom handler doesn't exist, or if it returns,
	79	use the default handler, which will not return. */
	80	png_default_error(png_ptr, error_message);
	81	}
	82	#else
	83	void PNGAPI
	84	png_err(png_structp png_ptr)
	85	{
	86	if (png_ptr != NULL && png_ptr->error_fn != NULL)
	87	(*(png_ptr->error_fn))(png_ptr, '\0');
	88
	89	/* If the custom handler doesn't exist, or if it returns,
	90	use the default handler, which will not return. */
	91	png_default_error(png_ptr, '\0');
	92	}
	93	#endif /* PNG_NO_ERROR_TEXT */
	94
	95	#ifndef PNG_NO_WARNINGS
	96	/* This function is called whenever there is a non-fatal error. This function
	97	* should not be changed. If there is a need to handle warnings differently,
	98	* you should supply a replacement warning function and use
	99	* png_set_error_fn() to replace the warning function at run-time.
	100	*/
	101	void PNGAPI
	102	png_warning(png_structp png_ptr, png_const_charp warning_message)
	103	{
	104	int offset = 0;
	105	if (png_ptr != NULL)
	106	{
	107	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	108	if (png_ptr->flags&
	109	(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))
	110	#endif
	111	{
	112	if (*warning_message == '#')
	113	{
970f6abe VZ	114	for (offset = 1; offset < 15; offset++)
970f6abe VZ	115	if (warning_message[offset] == ' ')
0272a10d VZ	116	break;
	117	}
	118	}
0272a10d	119	}
970f6abe VZ	120	if (png_ptr != NULL && png_ptr->warning_fn != NULL)
970f6abe VZ	121	(*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
0272a10d	122	else
970f6abe	123	png_default_warning(png_ptr, warning_message + offset);
0272a10d VZ	124	}
	125	#endif /* PNG_NO_WARNINGS */
	126
	127
	128	/* These utilities are used internally to build an error message that relates
	129	* to the current chunk. The chunk name comes from png_ptr->chunk_name,
	130	* this is used to prefix the message. The message is limited in length
	131	* to 63 bytes, the name characters are output as hex digits wrapped in []
	132	* if the character is invalid.
	133	*/
	134	#define isnonalpha(c) ((c) < 65 \|\| (c) > 122 \|\| ((c) > 90 && (c) < 97))
	135	static PNG_CONST char png_digit[16] = {
	136	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
	137	'A', 'B', 'C', 'D', 'E', 'F'
	138	};
	139
970f6abe VZ	140	#define PNG_MAX_ERROR_TEXT 64
970f6abe VZ	141
0272a10d VZ	142	#if !defined(PNG_NO_WARNINGS) \|\| !defined(PNG_NO_ERROR_TEXT)
	143	static void /* PRIVATE */
	144	png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
	145	error_message)
	146	{
	147	int iout = 0, iin = 0;
	148
	149	while (iin < 4)
	150	{
	151	int c = png_ptr->chunk_name[iin++];
	152	if (isnonalpha(c))
	153	{
	154	buffer[iout++] = '[';
	155	buffer[iout++] = png_digit[(c & 0xf0) >> 4];
	156	buffer[iout++] = png_digit[c & 0x0f];
	157	buffer[iout++] = ']';
	158	}
	159	else
	160	{
	161	buffer[iout++] = (png_byte)c;
	162	}
	163	}
	164
	165	if (error_message == NULL)
970f6abe	166	buffer[iout] = '\0';
0272a10d VZ	167	else
	168	{
	169	buffer[iout++] = ':';
	170	buffer[iout++] = ' ';
970f6abe VZ	171	png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
970f6abe VZ	172	buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
0272a10d VZ	173	}
	174	}
	175
	176	#ifdef PNG_READ_SUPPORTED
	177	void PNGAPI
	178	png_chunk_error(png_structp png_ptr, png_const_charp error_message)
	179	{
970f6abe	180	char msg[18+PNG_MAX_ERROR_TEXT];
0272a10d VZ	181	if (png_ptr == NULL)
	182	png_error(png_ptr, error_message);
	183	else
	184	{
	185	png_format_buffer(png_ptr, msg, error_message);
	186	png_error(png_ptr, msg);
	187	}
	188	}
	189	#endif /* PNG_READ_SUPPORTED */
	190	#endif /* !defined(PNG_NO_WARNINGS) \|\| !defined(PNG_NO_ERROR_TEXT) */
	191
	192	#ifndef PNG_NO_WARNINGS
	193	void PNGAPI
	194	png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
	195	{
970f6abe	196	char msg[18+PNG_MAX_ERROR_TEXT];
0272a10d VZ	197	if (png_ptr == NULL)
	198	png_warning(png_ptr, warning_message);
	199	else
	200	{
	201	png_format_buffer(png_ptr, msg, warning_message);
	202	png_warning(png_ptr, msg);
	203	}
	204	}
	205	#endif /* PNG_NO_WARNINGS */
	206
	207
	208	/* This is the default error handling function. Note that replacements for
	209	* this function MUST NOT RETURN, or the program will likely crash. This
	210	* function is used by default, or if the program supplies NULL for the
	211	* error function pointer in png_set_error_fn().
	212	*/
	213	static void /* PRIVATE */
	214	png_default_error(png_structp png_ptr, png_const_charp error_message)
	215	{
	216	#ifndef PNG_NO_CONSOLE_IO
	217	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	218	if (*error_message == '#')
	219	{
970f6abe	220	/* Strip "#nnnn " from beginning of warning message. */
0272a10d VZ	221	int offset;
0272a10d VZ	222	char error_number[16];
970f6abe	223	for (offset = 0; offset<15; offset++)
0272a10d	224	{
970f6abe VZ	225	error_number[offset] = error_message[offset + 1];
970f6abe VZ	226	if (error_message[offset] == ' ')
0272a10d VZ	227	break;
0272a10d VZ	228	}
970f6abe	229	if ((offset > 1) && (offset < 15))
0272a10d	230	{
970f6abe	231	error_number[offset - 1] = '\0';
0272a10d	232	fprintf(stderr, "libpng error no. %s: %s\n", error_number,
970f6abe	233	error_message + offset + 1);
0272a10d VZ	234	}
0272a10d VZ	235	else
970f6abe	236	fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
0272a10d VZ	237	}
	238	else
	239	#endif
	240	fprintf(stderr, "libpng error: %s\n", error_message);
	241	#endif
	242
	243	#ifdef PNG_SETJMP_SUPPORTED
	244	if (png_ptr)
	245	{
	246	# ifdef USE_FAR_KEYWORD
	247	{
	248	jmp_buf jmpbuf;
	249	png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
	250	longjmp(jmpbuf, 1);
	251	}
	252	# else
	253	longjmp(png_ptr->jmpbuf, 1);
	254	# endif
	255	}
	256	#else
	257	PNG_ABORT();
	258	#endif
	259	#ifdef PNG_NO_CONSOLE_IO
	260	error_message = error_message; /* make compiler happy */
	261	#endif
	262	}
	263
	264	#ifndef PNG_NO_WARNINGS
	265	/* This function is called when there is a warning, but the library thinks
	266	* it can continue anyway. Replacement functions don't have to do anything
	267	* here if you don't want them to. In the default configuration, png_ptr is
	268	* not used, but it is passed in case it may be useful.
	269	*/
	270	static void /* PRIVATE */
	271	png_default_warning(png_structp png_ptr, png_const_charp warning_message)
	272	{
	273	#ifndef PNG_NO_CONSOLE_IO
	274	# ifdef PNG_ERROR_NUMBERS_SUPPORTED
	275	if (*warning_message == '#')
	276	{
	277	int offset;
	278	char warning_number[16];
970f6abe	279	for (offset = 0; offset < 15; offset++)
0272a10d	280	{
970f6abe VZ	281	warning_number[offset] = warning_message[offset + 1];
970f6abe VZ	282	if (warning_message[offset] == ' ')
0272a10d VZ	283	break;
0272a10d VZ	284	}
970f6abe	285	if ((offset > 1) && (offset < 15))
0272a10d	286	{
970f6abe	287	warning_number[offset + 1] = '\0';
0272a10d	288	fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
970f6abe	289	warning_message + offset);
0272a10d VZ	290	}
	291	else
	292	fprintf(stderr, "libpng warning: %s\n", warning_message);
	293	}
	294	else
	295	# endif
	296	fprintf(stderr, "libpng warning: %s\n", warning_message);
	297	#else
	298	warning_message = warning_message; /* make compiler happy */
	299	#endif
	300	png_ptr = png_ptr; /* make compiler happy */
	301	}
	302	#endif /* PNG_NO_WARNINGS */
	303
	304	/* This function is called when the application wants to use another method
	305	* of handling errors and warnings. Note that the error function MUST NOT
	306	* return to the calling routine or serious problems will occur. The return
	307	* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
	308	*/
	309	void PNGAPI
	310	png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
	311	png_error_ptr error_fn, png_error_ptr warning_fn)
	312	{
	313	if (png_ptr == NULL)
	314	return;
	315	png_ptr->error_ptr = error_ptr;
	316	png_ptr->error_fn = error_fn;
	317	png_ptr->warning_fn = warning_fn;
	318	}
	319
	320
	321	/* This function returns a pointer to the error_ptr associated with the user
	322	* functions. The application should free any memory associated with this
	323	* pointer before png_write_destroy and png_read_destroy are called.
	324	*/
	325	png_voidp PNGAPI
	326	png_get_error_ptr(png_structp png_ptr)
	327	{
	328	if (png_ptr == NULL)
	329	return NULL;
	330	return ((png_voidp)png_ptr->error_ptr);
	331	}
	332
	333
	334	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	335	void PNGAPI
	336	png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
	337	{
970f6abe	338	if (png_ptr != NULL)
0272a10d VZ	339	{
	340	png_ptr->flags &=
	341	((~(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
	342	}
	343	}
	344	#endif
	345	#endif /* PNG_READ_SUPPORTED \|\| PNG_WRITE_SUPPORTED */