src/png/pngerror.c


/* pngerror.c - stub functions for i/o and memory allocation
 *
 * libpng 1.2.5rc3 - September 18, 2002
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998-2002 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"

static void /* PRIVATE */
png_default_error PNGARG((png_structp png_ptr,
  png_const_charp error_message));
static void /* PRIVATE */
png_default_warning PNGARG((png_structp png_ptr,
  png_const_charp warning_message));

/* 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.
 */
void PNGAPI
png_error(png_structp png_ptr, png_const_charp error_message)
{
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
   char msg[16];
   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
   {
     int offset = 0;
     if (*error_message == '#')
     {
         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->error_fn != NULL)
      (*(png_ptr->error_fn))(png_ptr, error_message);

   /* if the following returns or doesn't exist, use the default function,
      which will not return */
   png_default_error(png_ptr, error_message);
}

/* 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;
#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->warning_fn != NULL)
      (*(png_ptr->warning_fn))(png_ptr,
         (png_const_charp)(warning_message+offset));
   else
      png_default_warning(png_ptr, (png_const_charp)(warning_message+offset));
}

/* 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) < 41 || (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' };

static size_t wxstrnlen( const char *s, size_t maxlen )
{
	size_t i ;
	for ( i = 0 ; s[i] && i < maxlen ; ++i )
		;
	return i ;
}

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
   {
      int len = wxstrnlen(error_message, 64);

      buffer[iout++] = ':';
      buffer[iout++] = ' ';
      png_memcpy(buffer+iout, error_message, len);
      buffer[iout+len-1] = 0;
   }
}

void PNGAPI
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
   char msg[18+64];
   png_format_buffer(png_ptr, msg, error_message);
   png_error(png_ptr, msg);
}

void PNGAPI
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
   char msg[18+64];
   png_format_buffer(png_ptr, msg, warning_message);
   png_warning(png_ptr, msg);
}

/* 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);
#else
   if (error_message)
     /* make compiler happy */ ;
#endif

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

/* 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
   if (warning_message)
     /* appease compiler */ ;
#endif
   if (png_ptr)
      return;
}

/* 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)
{
   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)
{
   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
Commit	Line	Data
	1
	2	/* pngerror.c - stub functions for i/o and memory allocation
	3	*
	4	* libpng 1.2.5rc3 - September 18, 2002
	5	* For conditions of distribution and use, see copyright notice in png.h
	6	* Copyright (c) 1998-2002 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	static void /* PRIVATE */
	20	png_default_error PNGARG((png_structp png_ptr,
	21	png_const_charp error_message));
	22	static void /* PRIVATE */
	23	png_default_warning PNGARG((png_structp png_ptr,
	24	png_const_charp warning_message));
	25
	26	/* This function is called whenever there is a fatal error. This function
	27	* should not be changed. If there is a need to handle errors differently,
	28	* you should supply a replacement error function and use png_set_error_fn()
	29	* to replace the error function at run-time.
	30	*/
	31	void PNGAPI
	32	png_error(png_structp png_ptr, png_const_charp error_message)
	33	{
	34	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	35	char msg[16];
	36	if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))
	37	{
	38	int offset = 0;
	39	if (*error_message == '#')
	40	{
	41	for (offset=1; offset<15; offset++)
	42	if (*(error_message+offset) == ' ')
	43	break;
	44	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
	45	{
	46	int i;
	47	for (i=0; i<offset-1; i++)
	48	msg[i]=error_message[i+1];
	49	msg[i]='\0';
	50	error_message=msg;
	51	}
	52	else
	53	error_message+=offset;
	54	}
	55	else
	56	{
	57	if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
	58	{
	59	msg[0]='0';
	60	msg[1]='\0';
	61	error_message=msg;
	62	}
	63	}
	64	}
	65	#endif
	66	if (png_ptr->error_fn != NULL)
	67	(*(png_ptr->error_fn))(png_ptr, error_message);
	68
	69	/* if the following returns or doesn't exist, use the default function,
	70	which will not return */
	71	png_default_error(png_ptr, error_message);
	72	}
	73
	74	/* This function is called whenever there is a non-fatal error. This function
	75	* should not be changed. If there is a need to handle warnings differently,
	76	* you should supply a replacement warning function and use
	77	* png_set_error_fn() to replace the warning function at run-time.
	78	*/
	79	void PNGAPI
	80	png_warning(png_structp png_ptr, png_const_charp warning_message)
	81	{
	82	int offset = 0;
	83	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	84	if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))
	85	#endif
	86	{
	87	if (*warning_message == '#')
	88	{
	89	for (offset=1; offset<15; offset++)
	90	if (*(warning_message+offset) == ' ')
	91	break;
	92	}
	93	}
	94	if (png_ptr->warning_fn != NULL)
	95	(*(png_ptr->warning_fn))(png_ptr,
	96	(png_const_charp)(warning_message+offset));
	97	else
	98	png_default_warning(png_ptr, (png_const_charp)(warning_message+offset));
	99	}
	100
	101	/* These utilities are used internally to build an error message that relates
	102	* to the current chunk. The chunk name comes from png_ptr->chunk_name,
	103	* this is used to prefix the message. The message is limited in length
	104	* to 63 bytes, the name characters are output as hex digits wrapped in []
	105	* if the character is invalid.
	106	*/
	107	#define isnonalpha(c) ((c) < 41 \|\| (c) > 122 \|\| ((c) > 90 && (c) < 97))
	108	static PNG_CONST char png_digit[16] = {
	109	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
	110	'F' };
	111
	112	static size_t wxstrnlen( const char *s, size_t maxlen )
	113	{
	114	size_t i ;
	115	for ( i = 0 ; s[i] && i < maxlen ; ++i )
	116	;
	117	return i ;
	118	}
	119
	120	static void /* PRIVATE */
	121	png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
	122	error_message)
	123	{
	124	int iout = 0, iin = 0;
	125
	126	while (iin < 4)
	127	{
	128	int c = png_ptr->chunk_name[iin++];
	129	if (isnonalpha(c))
	130	{
	131	buffer[iout++] = '[';
	132	buffer[iout++] = png_digit[(c & 0xf0) >> 4];
	133	buffer[iout++] = png_digit[c & 0x0f];
	134	buffer[iout++] = ']';
	135	}
	136	else
	137	{
	138	buffer[iout++] = (png_byte)c;
	139	}
	140	}
	141
	142	if (error_message == NULL)
	143	buffer[iout] = 0;
	144	else
	145	{
	146	int len = wxstrnlen(error_message, 64);
	147
	148	buffer[iout++] = ':';
	149	buffer[iout++] = ' ';
	150	png_memcpy(buffer+iout, error_message, len);
	151	buffer[iout+len-1] = 0;
	152	}
	153	}
	154
	155	void PNGAPI
	156	png_chunk_error(png_structp png_ptr, png_const_charp error_message)
	157	{
	158	char msg[18+64];
	159	png_format_buffer(png_ptr, msg, error_message);
	160	png_error(png_ptr, msg);
	161	}
	162
	163	void PNGAPI
	164	png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
	165	{
	166	char msg[18+64];
	167	png_format_buffer(png_ptr, msg, warning_message);
	168	png_warning(png_ptr, msg);
	169	}
	170
	171	/* This is the default error handling function. Note that replacements for
	172	* this function MUST NOT RETURN, or the program will likely crash. This
	173	* function is used by default, or if the program supplies NULL for the
	174	* error function pointer in png_set_error_fn().
	175	*/
	176	static void /* PRIVATE */
	177	png_default_error(png_structp png_ptr, png_const_charp error_message)
	178	{
	179	#ifndef PNG_NO_CONSOLE_IO
	180	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	181	if (*error_message == '#')
	182	{
	183	int offset;
	184	char error_number[16];
	185	for (offset=0; offset<15; offset++)
	186	{
	187	error_number[offset] = *(error_message+offset+1);
	188	if (*(error_message+offset) == ' ')
	189	break;
	190	}
	191	if((offset > 1) && (offset < 15))
	192	{
	193	error_number[offset-1]='\0';
	194	fprintf(stderr, "libpng error no. %s: %s\n", error_number,
	195	error_message+offset);
	196	}
	197	else
	198	fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
	199	}
	200	else
	201	#endif
	202	fprintf(stderr, "libpng error: %s\n", error_message);
	203	#else
	204	if (error_message)
	205	/* make compiler happy */ ;
	206	#endif
	207
	208	#ifdef PNG_SETJMP_SUPPORTED
	209	# ifdef USE_FAR_KEYWORD
	210	{
	211	jmp_buf jmpbuf;
	212	png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
	213	longjmp(jmpbuf, 1);
	214	}
	215	# else
	216	longjmp(png_ptr->jmpbuf, 1);
	217	# endif
	218	#else
	219	if (png_ptr)
	220	/* make compiler happy */ ;
	221	PNG_ABORT();
	222	#endif
	223	}
	224
	225	/* This function is called when there is a warning, but the library thinks
	226	* it can continue anyway. Replacement functions don't have to do anything
	227	* here if you don't want them to. In the default configuration, png_ptr is
	228	* not used, but it is passed in case it may be useful.
	229	*/
	230	static void /* PRIVATE */
	231	png_default_warning(png_structp png_ptr, png_const_charp warning_message)
	232	{
	233	#ifndef PNG_NO_CONSOLE_IO
	234	# ifdef PNG_ERROR_NUMBERS_SUPPORTED
	235	if (*warning_message == '#')
	236	{
	237	int offset;
	238	char warning_number[16];
	239	for (offset=0; offset<15; offset++)
	240	{
	241	warning_number[offset]=*(warning_message+offset+1);
	242	if (*(warning_message+offset) == ' ')
	243	break;
	244	}
	245	if((offset > 1) && (offset < 15))
	246	{
	247	warning_number[offset-1]='\0';
	248	fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
	249	warning_message+offset);
	250	}
	251	else
	252	fprintf(stderr, "libpng warning: %s\n", warning_message);
	253	}
	254	else
	255	# endif
	256	fprintf(stderr, "libpng warning: %s\n", warning_message);
	257	#else
	258	if (warning_message)
	259	/* appease compiler */ ;
	260	#endif
	261	if (png_ptr)
	262	return;
	263	}
	264
	265	/* This function is called when the application wants to use another method
	266	* of handling errors and warnings. Note that the error function MUST NOT
	267	* return to the calling routine or serious problems will occur. The return
	268	* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
	269	*/
	270	void PNGAPI
	271	png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
	272	png_error_ptr error_fn, png_error_ptr warning_fn)
	273	{
	274	png_ptr->error_ptr = error_ptr;
	275	png_ptr->error_fn = error_fn;
	276	png_ptr->warning_fn = warning_fn;
	277	}
	278
	279
	280	/* This function returns a pointer to the error_ptr associated with the user
	281	* functions. The application should free any memory associated with this
	282	* pointer before png_write_destroy and png_read_destroy are called.
	283	*/
	284	png_voidp PNGAPI
	285	png_get_error_ptr(png_structp png_ptr)
	286	{
	287	return ((png_voidp)png_ptr->error_ptr);
	288	}
	289
	290
	291	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
	292	void PNGAPI
	293	png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
	294	{
	295	if(png_ptr != NULL)
	296	{
	297	png_ptr->flags &=
	298	((~(PNG_FLAG_STRIP_ERROR_NUMBERS\|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
	299	}
	300	}
	301	#endif