100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
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/* pngerror.c - stub functions for i/o and memory allocation
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libpng 1.0 beta 2 - version 0.85
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For conditions of distribution and use, see copyright notice in png.h
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Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
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December 19, 1995
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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 modify the code in this
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file to meet their needs. See the instructions at each function. */
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#define PNG_INTERNAL
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#include "png.h"
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/* This function is called whenever there is an error. Replace with
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however you wish to handle the error. Note that this function
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MUST NOT return, or the program will crash */
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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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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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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
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thinks it can continue anyway. You don't have to do anything here
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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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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
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method of handling errors and warnings. Note that the error function must
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NOT return to the calling routine or serious problems will occur. The
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error return method used in the default routine calls
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longjmp(png_ptr->jmpbuf, 1) */
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void
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png_set_message_fn(png_structp png_ptr, png_voidp msg_ptr, png_msg_ptr error_fn,
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png_msg_ptr warning_fn)
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{
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png_ptr->msg_ptr = msg_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 msg_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_msg_ptr(png_structp png_ptr)
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{
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return png_ptr->msg_ptr;
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}
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