pngerror.c
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上传用户:caisha3
上传日期:2013-09-21
资源大小:208739k
文件大小:4k
源码类别:
Windows编程
开发平台:
Visual C++
- /* pngerror.c - stub functions for i/o and memory allocation
- libpng 1.0 beta 2 - version 0.88
- For conditions of distribution and use, see copyright notice in png.h
- Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- January 25, 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. */
- #ifdef NEVER
- #define PNG_INTERNAL
- #include "png.h"
- #endif
- #include "headers.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
- OutputDebugStringA( "libpng error: " );
- OutputDebugStringA( message );
- OutputDebugStringA( "n" );
- #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
- OutputDebugStringA( "libpng warning: " );
- OutputDebugStringA( message );
- OutputDebugStringA( "n" );
- #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;
- }
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