290 lines
8.1 KiB
C
290 lines
8.1 KiB
C
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/* pngerror.c - stub functions for i/o and memory allocation
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*
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* libpng 1.2.1beta1 - October 19, 2001
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2001 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This file provides a location for all error handling. Users who
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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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*/
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#define PNG_INTERNAL
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#include "png.h"
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static void /* PRIVATE */
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png_default_error PNGARG((png_structp png_ptr,
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png_const_charp message));
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static void /* PRIVATE */
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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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*/
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void PNGAPI
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png_error(png_structp png_ptr, png_const_charp message)
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{
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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char msg[16];
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if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
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{
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int offset = 0;
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if (*message == '#')
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{
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for (offset=1; offset<15; offset++)
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if (*(message+offset) == ' ')
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break;
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if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
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{
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int i;
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for (i=0; i<offset-1; i++)
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msg[i]=message[i+1];
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msg[i]='\0';
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message=msg;
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}
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else
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message+=offset;
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}
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else
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{
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if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
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{
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msg[0]='0';
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msg[1]='\0';
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message=msg;
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}
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}
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}
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#endif
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if (png_ptr->error_fn != NULL)
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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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*/
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void PNGAPI
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png_warning(png_structp png_ptr, png_const_charp message)
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{
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int offset = 0;
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
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#endif
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{
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if (*message == '#')
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{
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for (offset=1; offset<15; offset++)
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if (*(message+offset) == ' ')
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break;
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}
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}
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if (png_ptr->warning_fn != NULL)
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(*(png_ptr->warning_fn))(png_ptr, (png_const_charp)(message+offset));
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else
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png_default_warning(png_ptr, (png_const_charp)(message+offset));
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}
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/* These utilities are used internally to build an error message that relates
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* to the current chunk. The chunk name comes from png_ptr->chunk_name,
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* this is used to prefix the message. The message is limited in length
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* to 63 bytes, the name characters are output as hex digits wrapped in []
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* if the character is invalid.
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*/
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#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
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static PNG_CONST char png_digit[16] = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
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'F' };
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static void /* PRIVATE */
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png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
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message)
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{
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int iout = 0, iin = 0;
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while (iin < 4)
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{
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int c = png_ptr->chunk_name[iin++];
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if (isnonalpha(c))
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{
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buffer[iout++] = '[';
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buffer[iout++] = png_digit[(c & 0xf0) >> 4];
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buffer[iout++] = png_digit[c & 0x0f];
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buffer[iout++] = ']';
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}
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else
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{
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buffer[iout++] = (png_byte)c;
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}
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}
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if (message == NULL)
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buffer[iout] = 0;
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else
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{
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buffer[iout++] = ':';
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buffer[iout++] = ' ';
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png_memcpy(buffer+iout, message, 64);
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buffer[iout+63] = 0;
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}
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}
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void PNGAPI
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png_chunk_error(png_structp png_ptr, png_const_charp message)
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{
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char msg[18+64];
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png_format_buffer(png_ptr, msg, message);
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png_error(png_ptr, msg);
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}
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void PNGAPI
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png_chunk_warning(png_structp png_ptr, png_const_charp message)
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{
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char msg[18+64];
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png_format_buffer(png_ptr, msg, message);
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png_warning(png_ptr, msg);
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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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*/
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static void /* PRIVATE */
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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_CONSOLE_IO
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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if (*message == '#')
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{
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int offset;
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char error_number[16];
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for (offset=0; offset<15; offset++)
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{
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error_number[offset] = *(message+offset+1);
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if (*(message+offset) == ' ')
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break;
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}
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if((offset > 1) && (offset < 15))
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{
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error_number[offset-1]='\0';
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fprintf(stderr, "libpng error no. %s: %s\n", error_number, message+offset);
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}
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else
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fprintf(stderr, "libpng error: %s, offset=%d\n", message,offset);
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}
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else
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#endif
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fprintf(stderr, "libpng error: %s\n", message);
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#else
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if (message)
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/* make compiler happy */ ;
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#endif
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#ifdef PNG_SETJMP_SUPPORTED
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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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#else
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if (png_ptr)
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/* make compiler happy */ ;
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PNG_ABORT();
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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 them 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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*/
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static void /* PRIVATE */
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png_default_warning(png_structp png_ptr, png_const_charp message)
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{
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#ifndef PNG_NO_CONSOLE_IO
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# ifdef PNG_ERROR_NUMBERS_SUPPORTED
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if (*message == '#')
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{
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int offset;
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char warning_number[16];
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for (offset=0; offset<15; offset++)
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{
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warning_number[offset]=*(message+offset+1);
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if (*(message+offset) == ' ')
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break;
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}
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if((offset > 1) && (offset < 15))
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{
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warning_number[offset-1]='\0';
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fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
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message+offset);
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}
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else
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fprintf(stderr, "libpng warning: %s\n", message);
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}
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else
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# endif
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fprintf(stderr, "libpng warning: %s\n", message);
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#else
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if (message)
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/* appease compiler */ ;
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#endif
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if (png_ptr)
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return;
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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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*/
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void PNGAPI
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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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*/
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png_voidp PNGAPI
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png_get_error_ptr(png_structp png_ptr)
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{
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return ((png_voidp)png_ptr->error_ptr);
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}
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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void
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png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
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{
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if(png_ptr != NULL)
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{
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png_ptr->flags &=
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((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
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}
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}
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#endif
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