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
	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 */