109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
|
|
/* pngerror.c - stub functions for i/o and memory allocation
|
|
|
|
libpng 1.0 beta 2 - version 0.87
|
|
For conditions of distribution and use, see copyright notice in png.h
|
|
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
|
January 15, 1996
|
|
|
|
This file provides a location for all error handling. Users which
|
|
need special error handling are expected to write replacement functions
|
|
and use png_set_message_fn() to use those functions. See the instructions
|
|
at each function. */
|
|
|
|
#define PNG_INTERNAL
|
|
#include "png.h"
|
|
|
|
/* 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_message_fn()
|
|
to replace the error function at run-time. */
|
|
void
|
|
png_error(png_structp png_ptr, png_const_charp message)
|
|
{
|
|
if (png_ptr->error_fn)
|
|
(*(png_ptr->error_fn))(png_ptr, message);
|
|
|
|
/* if the following returns or doesn't exist, use the default function,
|
|
which will not return */
|
|
png_default_error(png_ptr, 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_message_fn() to replace the warning function at run-time. */
|
|
void
|
|
png_warning(png_structp png_ptr, png_const_charp message)
|
|
{
|
|
if (png_ptr->warning_fn)
|
|
(*(png_ptr->warning_fn))(png_ptr, message);
|
|
else
|
|
png_default_warning(png_ptr, message);
|
|
}
|
|
|
|
/* 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_message_fn(). */
|
|
void
|
|
png_default_error(png_structp png_ptr, png_const_charp message)
|
|
{
|
|
#ifndef PNG_NO_STDIO
|
|
fprintf(stderr, "libpng error: %s\n", message);
|
|
#endif
|
|
|
|
#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
|
|
}
|
|
|
|
/* 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 to. In the default configuration, png_ptr is
|
|
not used, but it is passed in case it may be useful. */
|
|
void
|
|
png_default_warning(png_structp png_ptr, png_const_charp message)
|
|
{
|
|
if (!png_ptr)
|
|
return;
|
|
|
|
#ifndef PNG_NO_STDIO
|
|
fprintf(stderr, "libpng warning: %s\n", message);
|
|
#endif
|
|
}
|
|
|
|
/* 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 error
|
|
return method used in the default routine calls
|
|
longjmp(png_ptr->jmpbuf, 1) */
|
|
void
|
|
png_set_message_fn(png_structp png_ptr, png_voidp msg_ptr, png_msg_ptr error_fn,
|
|
png_msg_ptr warning_fn)
|
|
{
|
|
png_ptr->msg_ptr = msg_ptr;
|
|
|
|
png_ptr->error_fn = error_fn;
|
|
png_ptr->warning_fn = warning_fn;
|
|
}
|
|
|
|
|
|
/* This function returns a pointer to the msg_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
|
|
png_get_msg_ptr(png_structp png_ptr)
|
|
{
|
|
return png_ptr->msg_ptr;
|
|
}
|
|
|
|
|
|
|