314 lines
8.9 KiB
C
314 lines
8.9 KiB
C
|
|
/* pngerror.c - stub functions for i/o and memory allocation
|
|
*
|
|
* Last changed in libpng 1.4.0 April 20, 2006
|
|
* For conditions of distribution and use, see copyright notice in png.h
|
|
* Copyright (c) 1998-2006 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.
|
|
*/
|
|
|
|
#include "png.h"
|
|
#include "pngintrn.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));
|
|
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 != 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);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* 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'
|
|
};
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
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];
|
|
if (png_ptr == NULL)
|
|
png_warning(png_ptr, warning_message);
|
|
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);
|
|
#endif
|
|
|
|
#ifdef PNG_SETJMP_SUPPORTED
|
|
# 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
|
|
/* make compiler happy */ ;
|
|
if (png_ptr)
|
|
PNG_ABORT();
|
|
#endif
|
|
#ifdef PNG_NO_CONSOLE_IO
|
|
/* make compiler happy */ ;
|
|
if (&error_message != NULL)
|
|
return;
|
|
#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
|
|
/* make compiler happy */ ;
|
|
if (warning_message)
|
|
return;
|
|
#endif
|
|
/* make compiler happy */ ;
|
|
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)
|
|
{
|
|
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 */
|