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686 lines
20 KiB
C
686 lines
20 KiB
C
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/* pngerror.c - stub functions for i/o and memory allocation
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*
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* Last changed in libpng 1.5.8 [February 1, 2011]
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* Copyright (c) 1998-2011 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 code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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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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#include "pngpriv.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr,
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png_const_charp error_message)),PNG_NORETURN);
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#ifdef PNG_WARNINGS_SUPPORTED
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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 warning_message));
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#endif /* PNG_WARNINGS_SUPPORTED */
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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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#ifdef PNG_ERROR_TEXT_SUPPORTED
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PNG_FUNCTION(void,PNGAPI
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png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN)
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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 != NULL)
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{
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if (png_ptr->flags&
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(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
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{
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if (*error_message == PNG_LITERAL_SHARP)
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{
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/* Strip "#nnnn " from beginning of error message. */
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int offset;
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for (offset = 1; offset<15; offset++)
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if (error_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] = error_message[i + 1];
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msg[i - 1] = '\0';
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error_message = msg;
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}
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else
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error_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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error_message = msg;
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}
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}
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}
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}
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#endif
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if (png_ptr != NULL && png_ptr->error_fn != NULL)
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(*(png_ptr->error_fn))(png_ptr, error_message);
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/* If the custom handler doesn't exist, or if it returns,
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use the default handler, which will not return. */
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png_default_error(png_ptr, error_message);
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}
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#else
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PNG_FUNCTION(void,PNGAPI
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png_err,(png_structp png_ptr),PNG_NORETURN)
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{
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/* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
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* erroneously as '\0', instead of the empty string "". This was
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* apparently an error, introduced in libpng-1.2.20, and png_default_error
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* will crash in this case.
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*/
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if (png_ptr != NULL && png_ptr->error_fn != NULL)
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(*(png_ptr->error_fn))(png_ptr, "");
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/* If the custom handler doesn't exist, or if it returns,
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use the default handler, which will not return. */
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png_default_error(png_ptr, "");
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}
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#endif /* PNG_ERROR_TEXT_SUPPORTED */
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/* Utility to safely appends strings to a buffer. This never errors out so
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* error checking is not required in the caller.
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*/
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size_t
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png_safecat(png_charp buffer, size_t bufsize, size_t pos,
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png_const_charp string)
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{
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if (buffer != NULL && pos < bufsize)
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{
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if (string != NULL)
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while (*string != '\0' && pos < bufsize-1)
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buffer[pos++] = *string++;
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buffer[pos] = '\0';
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}
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return pos;
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}
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#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
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/* Utility to dump an unsigned value into a buffer, given a start pointer and
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* and end pointer (which should point just *beyond* the end of the buffer!)
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* Returns the pointer to the start of the formatted string.
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*/
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png_charp
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png_format_number(png_const_charp start, png_charp end, int format,
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png_alloc_size_t number)
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{
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int count = 0; /* number of digits output */
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int mincount = 1; /* minimum number required */
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int output = 0; /* digit output (for the fixed point format) */
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*--end = '\0';
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/* This is written so that the loop always runs at least once, even with
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* number zero.
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*/
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while (end > start && (number != 0 || count < mincount))
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{
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static const char digits[] = "0123456789ABCDEF";
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switch (format)
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{
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case PNG_NUMBER_FORMAT_fixed:
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/* Needs five digits (the fraction) */
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mincount = 5;
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if (output || number % 10 != 0)
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{
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*--end = digits[number % 10];
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output = 1;
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}
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number /= 10;
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break;
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case PNG_NUMBER_FORMAT_02u:
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/* Expects at least 2 digits. */
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mincount = 2;
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/* fall through */
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case PNG_NUMBER_FORMAT_u:
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*--end = digits[number % 10];
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number /= 10;
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break;
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case PNG_NUMBER_FORMAT_02x:
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/* This format expects at least two digits */
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mincount = 2;
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/* fall through */
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case PNG_NUMBER_FORMAT_x:
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*--end = digits[number & 0xf];
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number >>= 4;
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break;
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default: /* an error */
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number = 0;
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break;
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}
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/* Keep track of the number of digits added */
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++count;
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/* Float a fixed number here: */
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if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start)
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{
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/* End of the fraction, but maybe nothing was output? In that case
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* drop the decimal point. If the number is a true zero handle that
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* here.
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*/
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if (output)
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*--end = '.';
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else if (number == 0) /* and !output */
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*--end = '0';
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}
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}
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return end;
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}
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#endif
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#ifdef PNG_WARNINGS_SUPPORTED
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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 warning_message)
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{
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int offset = 0;
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if (png_ptr != NULL)
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{
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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if (png_ptr->flags&
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(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
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#endif
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{
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if (*warning_message == PNG_LITERAL_SHARP)
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{
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for (offset = 1; offset < 15; offset++)
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if (warning_message[offset] == ' ')
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break;
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}
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}
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}
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if (png_ptr != NULL && png_ptr->warning_fn != NULL)
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(*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
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else
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png_default_warning(png_ptr, warning_message + offset);
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}
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/* These functions support 'formatted' warning messages with up to
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* PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter
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* is introduced by @<number>, where 'number' starts at 1. This follows the
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* standard established by X/Open for internationalizable error messages.
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*/
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void
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png_warning_parameter(png_warning_parameters p, int number,
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png_const_charp string)
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{
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if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
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(void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
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}
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void
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png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
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png_alloc_size_t value)
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{
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char buffer[PNG_NUMBER_BUFFER_SIZE];
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png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
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}
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void
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png_warning_parameter_signed(png_warning_parameters p, int number, int format,
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png_int_32 value)
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{
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png_alloc_size_t u;
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png_charp str;
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char buffer[PNG_NUMBER_BUFFER_SIZE];
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/* Avoid overflow by doing the negate in a png_alloc_size_t: */
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u = (png_alloc_size_t)value;
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if (value < 0)
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u = ~u + 1;
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str = PNG_FORMAT_NUMBER(buffer, format, u);
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if (value < 0 && str > buffer)
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*--str = '-';
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png_warning_parameter(p, number, str);
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}
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void
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png_formatted_warning(png_structp png_ptr, png_warning_parameters p,
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png_const_charp message)
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{
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/* The internal buffer is just 192 bytes - enough for all our messages,
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* overflow doesn't happen because this code checks! If someone figures
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* out how to send us a message longer than 192 bytes, all that will
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* happen is that the message will be truncated appropriately.
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*/
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size_t i = 0; /* Index in the msg[] buffer: */
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char msg[192];
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/* Each iteration through the following loop writes at most one character
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* to msg[i++] then returns here to validate that there is still space for
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* the trailing '\0'. It may (in the case of a parameter) read more than
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* one character from message[]; it must check for '\0' and continue to the
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* test if it finds the end of string.
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*/
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while (i<(sizeof msg)-1 && *message != '\0')
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{
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/* '@' at end of string is now just printed (previously it was skipped);
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* it is an error in the calling code to terminate the string with @.
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*/
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if (p != NULL && *message == '@' && message[1] != '\0')
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{
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int parameter_char = *++message; /* Consume the '@' */
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static const char valid_parameters[] = "123456789";
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int parameter = 0;
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/* Search for the parameter digit, the index in the string is the
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* parameter to use.
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*/
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while (valid_parameters[parameter] != parameter_char &&
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valid_parameters[parameter] != '\0')
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++parameter;
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/* If the parameter digit is out of range it will just get printed. */
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if (parameter < PNG_WARNING_PARAMETER_COUNT)
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{
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/* Append this parameter */
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png_const_charp parm = p[parameter];
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png_const_charp pend = p[parameter] + (sizeof p[parameter]);
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/* No need to copy the trailing '\0' here, but there is no guarantee
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* that parm[] has been initialized, so there is no guarantee of a
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* trailing '\0':
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*/
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while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
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msg[i++] = *parm++;
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/* Consume the parameter digit too: */
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++message;
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continue;
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}
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/* else not a parameter and there is a character after the @ sign; just
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* copy that. This is known not to be '\0' because of the test above.
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*/
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}
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/* At this point *message can't be '\0', even in the bad parameter case
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* above where there is a lone '@' at the end of the message string.
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*/
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msg[i++] = *message++;
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}
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/* i is always less than (sizeof msg), so: */
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msg[i] = '\0';
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/* And this is the formatted message, it may be larger than
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* PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these are
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* not (currently) formatted.
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*/
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png_warning(png_ptr, msg);
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}
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#endif /* PNG_WARNINGS_SUPPORTED */
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#ifdef PNG_BENIGN_ERRORS_SUPPORTED
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void PNGAPI
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png_benign_error(png_structp png_ptr, png_const_charp error_message)
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{
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if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
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png_warning(png_ptr, error_message);
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else
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png_error(png_ptr, error_message);
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}
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#endif
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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) < 65 || (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',
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'A', 'B', 'C', 'D', 'E', 'F'
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};
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#define PNG_MAX_ERROR_TEXT 64
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#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
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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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error_message)
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{
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png_uint_32 chunk_name = png_ptr->chunk_name;
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int iout = 0, ishift = 24;
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while (ishift >= 0)
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{
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int c = (int)(chunk_name >> ishift) & 0xff;
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ishift -= 8;
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if (isnonalpha(c))
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{
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buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
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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++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
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}
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else
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{
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buffer[iout++] = (char)c;
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}
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}
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if (error_message == NULL)
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buffer[iout] = '\0';
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else
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{
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int iin = 0;
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buffer[iout++] = ':';
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buffer[iout++] = ' ';
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while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
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buffer[iout++] = error_message[iin++];
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/* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
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buffer[iout] = '\0';
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}
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}
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#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */
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#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
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PNG_FUNCTION(void,PNGAPI
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png_chunk_error,(png_structp png_ptr, png_const_charp error_message),
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PNG_NORETURN)
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{
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char msg[18+PNG_MAX_ERROR_TEXT];
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if (png_ptr == NULL)
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png_error(png_ptr, error_message);
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else
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{
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png_format_buffer(png_ptr, msg, error_message);
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png_error(png_ptr, msg);
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}
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}
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#endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */
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#ifdef PNG_WARNINGS_SUPPORTED
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void PNGAPI
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png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
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{
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char msg[18+PNG_MAX_ERROR_TEXT];
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if (png_ptr == NULL)
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png_warning(png_ptr, warning_message);
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else
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{
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png_format_buffer(png_ptr, msg, warning_message);
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png_warning(png_ptr, msg);
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}
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}
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#endif /* PNG_WARNINGS_SUPPORTED */
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#ifdef PNG_READ_SUPPORTED
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#ifdef PNG_BENIGN_ERRORS_SUPPORTED
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void PNGAPI
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png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message)
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{
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if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
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png_chunk_warning(png_ptr, error_message);
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else
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png_chunk_error(png_ptr, error_message);
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}
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#endif
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#endif /* PNG_READ_SUPPORTED */
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#ifdef PNG_ERROR_TEXT_SUPPORTED
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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PNG_FUNCTION(void,
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png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN)
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{
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# define fixed_message "fixed point overflow in "
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# define fixed_message_ln ((sizeof fixed_message)-1)
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int iin;
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char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
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png_memcpy(msg, fixed_message, fixed_message_ln);
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iin = 0;
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if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
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{
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msg[fixed_message_ln + iin] = name[iin];
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++iin;
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}
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msg[fixed_message_ln + iin] = 0;
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png_error(png_ptr, msg);
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}
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#endif
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#endif
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#ifdef PNG_SETJMP_SUPPORTED
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/* This API only exists if ANSI-C style error handling is used,
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* otherwise it is necessary for png_default_error to be overridden.
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*/
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jmp_buf* PNGAPI
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png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn,
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size_t jmp_buf_size)
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{
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if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf))
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return NULL;
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png_ptr->longjmp_fn = longjmp_fn;
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return &png_ptr->longjmp_buffer;
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}
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#endif
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/* 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_error_fn().
|
|
*/
|
|
static PNG_FUNCTION(void /* PRIVATE */,
|
|
png_default_error,(png_structp png_ptr, png_const_charp error_message),
|
|
PNG_NORETURN)
|
|
{
|
|
#ifdef PNG_CONSOLE_IO_SUPPORTED
|
|
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
/* Check on NULL only added in 1.5.4 */
|
|
if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
|
|
{
|
|
/* Strip "#nnnn " from beginning of error message. */
|
|
int offset;
|
|
char error_number[16];
|
|
for (offset = 0; offset<15; offset++)
|
|
{
|
|
error_number[offset] = error_message[offset + 1];
|
|
if (error_message[offset] == ' ')
|
|
break;
|
|
}
|
|
|
|
if ((offset > 1) && (offset < 15))
|
|
{
|
|
error_number[offset - 1] = '\0';
|
|
fprintf(stderr, "libpng error no. %s: %s",
|
|
error_number, error_message + offset + 1);
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
|
|
else
|
|
{
|
|
fprintf(stderr, "libpng error: %s, offset=%d",
|
|
error_message, offset);
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
fprintf(stderr, "libpng error: %s", error_message ? error_message :
|
|
"undefined");
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
#else
|
|
PNG_UNUSED(error_message) /* Make compiler happy */
|
|
#endif
|
|
png_longjmp(png_ptr, 1);
|
|
}
|
|
|
|
PNG_FUNCTION(void,PNGAPI
|
|
png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN)
|
|
{
|
|
#ifdef PNG_SETJMP_SUPPORTED
|
|
if (png_ptr && png_ptr->longjmp_fn)
|
|
{
|
|
# ifdef USE_FAR_KEYWORD
|
|
{
|
|
jmp_buf tmp_jmpbuf;
|
|
png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));
|
|
png_ptr->longjmp_fn(tmp_jmpbuf, val);
|
|
}
|
|
|
|
# else
|
|
png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val);
|
|
# endif
|
|
}
|
|
#endif
|
|
/* Here if not setjmp support or if png_ptr is null. */
|
|
PNG_ABORT();
|
|
}
|
|
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
/* 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 them to. In the default configuration, png_ptr is
|
|
* not used, but it is passed in case it may be useful.
|
|
*/
|
|
static void /* PRIVATE */
|
|
png_default_warning(png_structp png_ptr, png_const_charp warning_message)
|
|
{
|
|
#ifdef PNG_CONSOLE_IO_SUPPORTED
|
|
# ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
if (*warning_message == PNG_LITERAL_SHARP)
|
|
{
|
|
int offset;
|
|
char warning_number[16];
|
|
for (offset = 0; offset < 15; offset++)
|
|
{
|
|
warning_number[offset] = warning_message[offset + 1];
|
|
if (warning_message[offset] == ' ')
|
|
break;
|
|
}
|
|
|
|
if ((offset > 1) && (offset < 15))
|
|
{
|
|
warning_number[offset + 1] = '\0';
|
|
fprintf(stderr, "libpng warning no. %s: %s",
|
|
warning_number, warning_message + offset);
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
|
|
else
|
|
{
|
|
fprintf(stderr, "libpng warning: %s",
|
|
warning_message);
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
}
|
|
else
|
|
# endif
|
|
|
|
{
|
|
fprintf(stderr, "libpng warning: %s", warning_message);
|
|
fprintf(stderr, PNG_STRING_NEWLINE);
|
|
}
|
|
#else
|
|
PNG_UNUSED(warning_message) /* Make compiler happy */
|
|
#endif
|
|
PNG_UNUSED(png_ptr) /* Make compiler happy */
|
|
}
|
|
#endif /* PNG_WARNINGS_SUPPORTED */
|
|
|
|
/* 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 return
|
|
* method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1)
|
|
*/
|
|
void PNGAPI
|
|
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warning_fn)
|
|
{
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->error_ptr = error_ptr;
|
|
png_ptr->error_fn = error_fn;
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
png_ptr->warning_fn = warning_fn;
|
|
#else
|
|
PNG_UNUSED(warning_fn)
|
|
#endif
|
|
}
|
|
|
|
|
|
/* This function returns a pointer to the error_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 PNGAPI
|
|
png_get_error_ptr(png_const_structp png_ptr)
|
|
{
|
|
if (png_ptr == NULL)
|
|
return NULL;
|
|
|
|
return ((png_voidp)png_ptr->error_ptr);
|
|
}
|
|
|
|
|
|
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
void PNGAPI
|
|
png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
|
|
{
|
|
if (png_ptr != NULL)
|
|
{
|
|
png_ptr->flags &=
|
|
((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
|
|
PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
|
|
}
|
|
}
|
|
#endif
|
|
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
|