112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
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/* pngerror.c - stub functions for i/o and memory allocation
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libpng 1.0 beta 3 - version 0.89
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For conditions of distribution and use, see copyright notice in png.h
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Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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May 25, 1996
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This file provides a location for all error handling. Users which
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need special error handling are expected to write replacement functions
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and use png_set_error_fn() to use those functions. See the instructions
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at each function. */
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#define PNG_INTERNAL
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#include "png.h"
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static void png_default_error PNGARG((png_structp png_ptr,
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png_const_charp message));
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static void png_default_warning PNGARG((png_structp png_ptr,
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png_const_charp message));
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/* This function is called whenever there is a fatal error. This function
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should not be changed. If there is a need to handle errors differently,
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you should supply a replacement error function and use png_set_error_fn()
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to replace the error function at run-time. */
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void
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png_error(png_structp png_ptr, png_const_charp message)
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{
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if (png_ptr->error_fn)
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(*(png_ptr->error_fn))(png_ptr, message);
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/* if the following returns or doesn't exist, use the default function,
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which will not return */
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png_default_error(png_ptr, message);
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}
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/* This function is called whenever there is a non-fatal error. This function
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should not be changed. If there is a need to handle warnings differently,
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you should supply a replacement warning function and use
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png_set_error_fn() to replace the warning function at run-time. */
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void
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png_warning(png_structp png_ptr, png_const_charp message)
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{
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if (png_ptr->warning_fn)
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(*(png_ptr->warning_fn))(png_ptr, message);
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else
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png_default_warning(png_ptr, message);
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}
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/* This is the default error handling function. Note that replacements for
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this function MUST NOT RETURN, or the program will likely crash. This
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function is used by default, or if the program supplies NULL for the
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error function pointer in png_set_error_fn(). */
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static void
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png_default_error(png_structp png_ptr, png_const_charp message)
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{
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#ifndef PNG_NO_STDIO
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fprintf(stderr, "libpng error: %s\n", message);
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#endif
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#ifdef USE_FAR_KEYWORD
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{
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jmp_buf jmpbuf;
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png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
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longjmp(jmpbuf, 1);
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}
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#else
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longjmp(png_ptr->jmpbuf, 1);
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#endif
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}
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/* This function is called when there is a warning, but the library thinks
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it can continue anyway. Replacement functions don't have to do anything
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here if you don't want to. In the default configuration, png_ptr is
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not used, but it is passed in case it may be useful. */
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static void
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png_default_warning(png_structp png_ptr, png_const_charp message)
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{
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if (!png_ptr)
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return;
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#ifndef PNG_NO_STDIO
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fprintf(stderr, "libpng warning: %s\n", message);
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#endif
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}
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/* This function is called when the application wants to use another method
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of handling errors and warnings. Note that the error function MUST NOT
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return to the calling routine or serious problems will occur. The return
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method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) */
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void
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png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
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png_error_ptr error_fn, png_error_ptr warning_fn)
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{
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png_ptr->error_ptr = error_ptr;
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png_ptr->error_fn = error_fn;
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png_ptr->warning_fn = warning_fn;
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}
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/* This function returns a pointer to the error_ptr associated with the user
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functions. The application should free any memory associated with this
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pointer before png_write_destroy and png_read_destroy are called. */
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png_voidp
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png_get_error_ptr(png_structp png_ptr)
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{
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return png_ptr->error_ptr;
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}
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