This repository has been archived on 2023-11-11. You can view files and clone it, but cannot push or open issues or pull requests.
libpng/pngerror.c

397 lines
12 KiB
C
Raw Normal View History

1995-12-19 09:22:19 +00:00
/* pngerror.c - stub functions for i/o and memory allocation
1998-01-01 13:13:13 +00:00
*
* Last changed in libpng 1.2.57 [(TO BE RELEASED)]
* Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson
2000-06-04 19:29:29 +00:00
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
1998-01-01 13:13:13 +00:00
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
1998-05-21 14:27:50 +00:00
* This file provides a location for all error handling. Users who
1998-01-01 13:13:13 +00:00
* 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.
*/
1995-12-19 09:22:19 +00:00
#define PNG_INTERNAL
2009-11-25 22:04:13 +00:00
#define PNG_NO_PEDANTIC_WARNINGS
1995-12-19 09:22:19 +00:00
#include "png.h"
2006-02-21 04:09:05 +00:00
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
2008-07-06 11:05:04 +00:00
2000-05-06 19:09:57 +00:00
static void /* PRIVATE */
png_default_error PNGARG((png_structp png_ptr,
png_const_charp error_message)) PNG_NORETURN;
#ifdef PNG_WARNINGS_SUPPORTED
2000-05-06 19:09:57 +00:00
static void /* PRIVATE */
png_default_warning PNGARG((png_structp png_ptr,
2002-05-11 01:19:58 +00:00
png_const_charp warning_message));
2009-10-18 00:18:43 +00:00
#endif /* PNG_WARNINGS_SUPPORTED */
1996-06-05 20:50:50 +00:00
1996-01-10 08:56:49 +00:00
/* This function is called whenever there is a fatal error. This function
1998-01-01 13:13:13 +00:00
* 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.
*/
#ifdef PNG_ERROR_TEXT_SUPPORTED
2000-05-06 19:09:57 +00:00
void PNGAPI
2002-05-11 01:19:58 +00:00
png_error(png_structp png_ptr, png_const_charp error_message)
1995-12-19 09:22:19 +00:00
{
2001-05-14 14:20:53 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
char msg[16];
2006-03-10 16:19:04 +00:00
if (png_ptr != NULL)
2001-05-14 14:20:53 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr->flags&
(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
2001-05-14 14:20:53 +00:00
{
if (*error_message == PNG_LITERAL_SHARP)
2006-03-10 16:19:04 +00:00
{
2009-03-21 13:10:28 +00:00
/* Strip "#nnnn " from beginning of error message. */
2006-03-10 16:19:04 +00:00
int offset;
2008-07-10 14:10:58 +00:00
for (offset = 1; offset<15; offset++)
2008-07-25 13:38:43 +00:00
if (error_message[offset] == ' ')
2006-03-10 16:19:04 +00:00
break;
if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
{
int i;
2008-07-25 13:38:43 +00:00
for (i = 0; i < offset - 1; i++)
2008-07-22 18:51:08 +00:00
msg[i] = error_message[i + 1];
2008-07-30 00:08:32 +00:00
msg[i - 1] = '\0';
2008-07-10 14:10:58 +00:00
error_message = msg;
2006-03-10 16:19:04 +00:00
}
else
2008-07-10 14:10:58 +00:00
error_message += offset;
2006-03-10 16:19:04 +00:00
}
else
{
if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
{
2008-07-22 18:51:08 +00:00
msg[0] = '0';
msg[1] = '\0';
error_message = msg;
2006-03-10 16:19:04 +00:00
}
}
2001-05-14 14:20:53 +00:00
}
}
#endif
2004-07-18 03:45:44 +00:00
if (png_ptr != NULL && png_ptr->error_fn != NULL)
2002-05-11 01:19:58 +00:00
(*(png_ptr->error_fn))(png_ptr, error_message);
1995-12-19 09:22:19 +00:00
2004-07-18 03:45:44 +00:00
/* If the custom handler doesn't exist, or if it returns,
use the default handler, which will not return. */
2002-05-11 01:19:58 +00:00
png_default_error(png_ptr, error_message);
1995-12-19 09:22:19 +00:00
}
2007-08-20 03:50:31 +00:00
#else
void PNGAPI
png_err(png_structp png_ptr)
{
/* Prior to 1.2.45 the error_fn received a NULL pointer, expressed
* erroneously as '\0', instead of the empty string "". This was
* apparently an error, introduced in libpng-1.2.20, and png_default_error
* will crash in this case.
*/
2007-08-20 03:50:31 +00:00
if (png_ptr != NULL && png_ptr->error_fn != NULL)
(*(png_ptr->error_fn))(png_ptr, "");
2007-08-20 03:50:31 +00:00
/* If the custom handler doesn't exist, or if it returns,
use the default handler, which will not return. */
png_default_error(png_ptr, "");
2007-08-20 03:50:31 +00:00
}
2009-10-18 00:18:43 +00:00
#endif /* PNG_ERROR_TEXT_SUPPORTED */
1995-12-19 09:22:19 +00:00
#ifdef PNG_WARNINGS_SUPPORTED
1996-01-10 08:56:49 +00:00
/* This function is called whenever there is a non-fatal error. This function
1998-01-01 13:13:13 +00:00
* 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.
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
2002-05-11 01:19:58 +00:00
png_warning(png_structp png_ptr, png_const_charp warning_message)
1995-12-19 09:22:19 +00:00
{
2004-07-18 03:45:44 +00:00
int offset = 0;
2006-03-10 16:19:04 +00:00
if (png_ptr != NULL)
{
2001-05-14 14:20:53 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2006-03-10 16:19:04 +00:00
if (png_ptr->flags&
(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
2001-05-14 14:20:53 +00:00
#endif
{
if (*warning_message == PNG_LITERAL_SHARP)
2006-03-10 16:19:04 +00:00
{
2008-07-25 13:38:43 +00:00
for (offset = 1; offset < 15; offset++)
if (warning_message[offset] == ' ')
2006-03-10 16:19:04 +00:00
break;
}
2001-05-14 14:20:53 +00:00
}
}
2008-11-27 12:44:23 +00:00
if (png_ptr != NULL && png_ptr->warning_fn != NULL)
(*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
1996-01-26 07:38:47 +00:00
else
2008-07-10 14:10:58 +00:00
png_default_warning(png_ptr, warning_message + offset);
1995-12-19 09:22:19 +00:00
}
2009-10-18 00:18:43 +00:00
#endif /* PNG_WARNINGS_SUPPORTED */
1995-12-19 09:22:19 +00:00
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_benign_error(png_structp png_ptr, png_const_charp error_message)
{
if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
png_warning(png_ptr, error_message);
else
png_error(png_ptr, error_message);
}
#endif
2007-05-28 13:45:13 +00:00
2002-05-21 23:06:08 +00:00
/* These utilities are used internally to build an error message that relates
1998-01-04 04:40:55 +00:00
* 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 PNG_MAX_ERROR_TEXT 64
#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
2004-07-18 03:45:44 +00:00
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
2007-05-18 18:40:59 +00:00
static PNG_CONST char png_digit[16] = {
2004-07-18 03:45:44 +00:00
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};
1998-01-04 04:40:55 +00:00
2000-05-06 19:09:57 +00:00
static void /* PRIVATE */
2001-04-20 15:32:10 +00:00
png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
2002-05-11 01:19:58 +00:00
error_message)
1998-01-04 04:40:55 +00:00
{
int iout = 0, iin = 0;
2000-02-05 05:40:16 +00:00
while (iin < 4)
{
1998-01-04 04:40:55 +00:00
int c = png_ptr->chunk_name[iin++];
2000-02-05 05:40:16 +00:00
if (isnonalpha(c))
{
buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
1998-01-04 04:40:55 +00:00
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
2000-02-05 05:40:16 +00:00
buffer[iout++] = png_digit[c & 0x0f];
buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
2000-02-05 05:40:16 +00:00
}
else
{
1999-10-14 12:43:10 +00:00
buffer[iout++] = (png_byte)c;
1998-01-04 04:40:55 +00:00
}
}
2002-05-11 01:19:58 +00:00
if (error_message == NULL)
2007-10-07 11:03:41 +00:00
buffer[iout] = '\0';
2000-02-05 05:40:16 +00:00
else
{
1998-01-04 04:40:55 +00:00
buffer[iout++] = ':';
buffer[iout++] = ' ';
iin = 0;
while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
buffer[iout++] = error_message[iin++];
/* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
buffer[iout] = '\0';
1998-01-04 04:40:55 +00:00
}
}
2007-07-14 19:43:24 +00:00
#ifdef PNG_READ_SUPPORTED
2000-05-06 19:09:57 +00:00
void PNGAPI
2002-05-11 01:19:58 +00:00
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
1998-01-04 04:40:55 +00:00
{
2007-10-16 19:27:46 +00:00
char msg[18+PNG_MAX_ERROR_TEXT];
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
png_error(png_ptr, error_message);
2006-11-08 02:09:46 +00:00
else
{
png_format_buffer(png_ptr, msg, error_message);
png_error(png_ptr, msg);
}
1998-01-04 04:40:55 +00:00
}
2007-08-20 03:50:31 +00:00
#endif /* PNG_READ_SUPPORTED */
2009-10-18 00:18:43 +00:00
#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */
1998-01-04 04:40:55 +00:00
#ifdef PNG_WARNINGS_SUPPORTED
2000-05-06 19:09:57 +00:00
void PNGAPI
2002-05-11 01:19:58 +00:00
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
1998-01-04 04:40:55 +00:00
{
2007-10-16 19:27:46 +00:00
char msg[18+PNG_MAX_ERROR_TEXT];
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
png_warning(png_ptr, warning_message);
2006-11-08 02:09:46 +00:00
else
{
png_format_buffer(png_ptr, msg, warning_message);
png_warning(png_ptr, msg);
}
1998-01-04 04:40:55 +00:00
}
2009-10-18 00:18:43 +00:00
#endif /* PNG_WARNINGS_SUPPORTED */
1998-01-04 04:40:55 +00:00
#ifdef PNG_READ_SUPPORTED
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
void PNGAPI
png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message)
{
if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
png_chunk_warning(png_ptr, error_message);
else
png_chunk_error(png_ptr, error_message);
}
#endif
#endif /* PNG_READ_SUPPORTED */
2007-05-28 13:45:13 +00:00
1996-01-16 07:51:56 +00:00
/* This is the default error handling function. Note that replacements for
1998-01-01 13:13:13 +00:00
* 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().
*/
2000-05-06 19:09:57 +00:00
static void /* PRIVATE */
2002-05-11 01:19:58 +00:00
png_default_error(png_structp png_ptr, png_const_charp error_message)
1995-12-19 09:22:19 +00:00
{
#ifdef PNG_CONSOLE_IO_SUPPORTED
2001-05-14 14:20:53 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
if (*error_message == PNG_LITERAL_SHARP)
2001-05-14 14:20:53 +00:00
{
2009-03-21 13:10:28 +00:00
/* Strip "#nnnn " from beginning of error message. */
2001-05-14 14:20:53 +00:00
int offset;
char error_number[16];
2008-07-22 18:51:08 +00:00
for (offset = 0; offset<15; offset++)
2001-05-14 14:20:53 +00:00
{
2008-07-25 13:38:43 +00:00
error_number[offset] = error_message[offset + 1];
if (error_message[offset] == ' ')
2001-05-14 14:20:53 +00:00
break;
}
2008-07-10 14:10:58 +00:00
if ((offset > 1) && (offset < 15))
2001-05-14 14:20:53 +00:00
{
2008-07-30 00:08:32 +00:00
error_number[offset - 1] = '\0';
2009-03-21 13:10:28 +00:00
fprintf(stderr, "libpng error no. %s: %s",
error_number, error_message + offset + 1);
fprintf(stderr, PNG_STRING_NEWLINE);
2001-05-14 14:20:53 +00:00
}
else
2009-05-20 17:43:52 +00:00
{
2009-03-21 13:10:28 +00:00
fprintf(stderr, "libpng error: %s, offset=%d",
error_message, offset);
fprintf(stderr, PNG_STRING_NEWLINE);
2009-05-20 17:43:52 +00:00
}
2001-05-14 14:20:53 +00:00
}
else
#endif
2009-03-21 13:10:28 +00:00
{
fprintf(stderr, "libpng error: %s", error_message);
fprintf(stderr, PNG_STRING_NEWLINE);
}
1995-12-19 09:22:19 +00:00
#endif
2000-02-05 05:40:16 +00:00
#ifdef PNG_SETJMP_SUPPORTED
2006-11-13 20:14:21 +00:00
if (png_ptr)
{
2000-02-05 05:40:16 +00:00
# ifdef USE_FAR_KEYWORD
1996-01-26 07:38:47 +00:00
{
jmp_buf jmpbuf;
2007-05-28 13:45:13 +00:00
png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
longjmp(jmpbuf,1);
1996-01-26 07:38:47 +00:00
}
2000-02-05 05:40:16 +00:00
# else
1996-01-26 07:38:47 +00:00
longjmp(png_ptr->jmpbuf, 1);
2006-11-13 20:14:21 +00:00
# endif
}
1995-12-19 09:22:19 +00:00
#endif
/* Here if not setjmp support or if png_ptr is null. */
PNG_ABORT();
#ifndef PNG_CONSOLE_IO_SUPPORTED
PNG_UNUSED(error_message) /* Make compiler happy */
2004-08-04 11:34:52 +00:00
#endif
1995-12-19 09:22:19 +00:00
}
#ifdef PNG_WARNINGS_SUPPORTED
1996-01-10 08:56:49 +00:00
/* This function is called when there is a warning, but the library thinks
1998-01-01 13:13:13 +00:00
* it can continue anyway. Replacement functions don't have to do anything
1998-06-14 19:43:31 +00:00
* here if you don't want them to. In the default configuration, png_ptr is
1998-01-01 13:13:13 +00:00
* not used, but it is passed in case it may be useful.
*/
2000-05-06 19:09:57 +00:00
static void /* PRIVATE */
2002-05-11 01:19:58 +00:00
png_default_warning(png_structp png_ptr, png_const_charp warning_message)
1995-12-19 09:22:19 +00:00
{
#ifdef PNG_CONSOLE_IO_SUPPORTED
2001-05-14 14:20:53 +00:00
# ifdef PNG_ERROR_NUMBERS_SUPPORTED
if (*warning_message == PNG_LITERAL_SHARP)
2001-05-14 14:20:53 +00:00
{
int offset;
char warning_number[16];
2008-07-22 18:51:08 +00:00
for (offset = 0; offset < 15; offset++)
2001-05-14 14:20:53 +00:00
{
2008-07-25 13:38:43 +00:00
warning_number[offset] = warning_message[offset + 1];
if (warning_message[offset] == ' ')
2001-05-14 14:20:53 +00:00
break;
}
2008-07-10 14:10:58 +00:00
if ((offset > 1) && (offset < 15))
2001-05-14 14:20:53 +00:00
{
2008-07-22 18:51:08 +00:00
warning_number[offset + 1] = '\0';
2009-03-21 13:10:28 +00:00
fprintf(stderr, "libpng warning no. %s: %s",
warning_number, warning_message + offset);
fprintf(stderr, PNG_STRING_NEWLINE);
2001-05-14 14:20:53 +00:00
}
else
2009-03-21 13:10:28 +00:00
{
fprintf(stderr, "libpng warning: %s",
warning_message);
fprintf(stderr, PNG_STRING_NEWLINE);
}
2001-05-14 14:20:53 +00:00
}
else
# endif
2009-03-21 13:10:28 +00:00
{
fprintf(stderr, "libpng warning: %s", warning_message);
fprintf(stderr, PNG_STRING_NEWLINE);
}
2000-05-29 13:58:03 +00:00
#else
PNG_UNUSED(warning_message) /* Make compiler happy */
1995-12-19 09:22:19 +00:00
#endif
PNG_UNUSED(png_ptr) /* Make compiler happy */
1995-12-19 09:22:19 +00:00
}
2009-10-18 00:18:43 +00:00
#endif /* PNG_WARNINGS_SUPPORTED */
1995-12-19 09:22:19 +00:00
1996-01-10 08:56:49 +00:00
/* This function is called when the application wants to use another method
1998-01-01 13:13:13 +00:00
* 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)
*/
2000-05-06 19:09:57 +00:00
void PNGAPI
1996-06-05 20:50:50 +00:00
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warning_fn)
1995-12-19 09:22:19 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return;
1996-06-05 20:50:50 +00:00
png_ptr->error_ptr = error_ptr;
1996-01-26 07:38:47 +00:00
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
1995-12-19 09:22:19 +00:00
}
1996-06-05 20:50:50 +00:00
/* This function returns a pointer to the error_ptr associated with the user
1998-01-01 13:13:13 +00:00
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
2000-05-06 19:09:57 +00:00
png_voidp PNGAPI
1996-06-05 20:50:50 +00:00
png_get_error_ptr(png_structp png_ptr)
1995-12-19 09:22:19 +00:00
{
2006-03-10 16:19:04 +00:00
if (png_ptr == NULL)
return NULL;
1998-02-01 02:07:59 +00:00
return ((png_voidp)png_ptr->error_ptr);
1995-12-19 09:22:19 +00:00
}
2001-05-14 14:20:53 +00:00
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2002-03-26 00:49:08 +00:00
void PNGAPI
2001-05-14 14:20:53 +00:00
png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
{
2008-07-10 14:10:58 +00:00
if (png_ptr != NULL)
2001-05-14 14:20:53 +00:00
{
png_ptr->flags &=
((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
}
}
#endif
2006-02-21 04:09:05 +00:00
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */