404 lines
12 KiB
C
404 lines
12 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 1.5.0 [February 9, 2010]
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* Copyright (c) 1998-2010 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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#define PNG_EXPOSE_INTERNAL_STRUCTURES
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#define PNG_NO_PEDANTIC_WARNINGS
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#include "png.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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#include "pngpriv.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 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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void PNGAPI
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png_error(png_structp png_ptr, png_const_charp error_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 != 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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void PNGAPI
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png_err(png_structp png_ptr)
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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, '\0');
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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, '\0');
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}
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#endif /* PNG_ERROR_TEXT_SUPPORTED */
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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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#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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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++] = 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++] = (png_byte)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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buffer[iout++] = ':';
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buffer[iout++] = ' ';
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png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
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buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
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}
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}
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#ifdef PNG_READ_SUPPORTED
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void PNGAPI
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png_chunk_error(png_structp png_ptr, png_const_charp error_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_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 */
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#endif /* PNG_WARNINGS_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_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->jmpbuf;
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}
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#endif
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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 error_message)
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{
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#ifdef PNG_CONSOLE_IO_SUPPORTED
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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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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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] = error_message[offset + 1];
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if (error_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",
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error_number, error_message + offset + 1);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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else
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{
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fprintf(stderr, "libpng error: %s, offset=%d",
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error_message, offset);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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}
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else
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#endif
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{
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fprintf(stderr, "libpng error: %s", error_message);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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#endif
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#ifdef PNG_SETJMP_SUPPORTED
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if (png_ptr && png_ptr->longjmp_fn)
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{
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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, png_sizeof(jmp_buf));
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png_ptr->longjmp_fn(jmpbuf, 1);
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}
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# else
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png_ptr->longjmp_fn(png_ptr->jmpbuf, 1);
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# endif
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}
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#endif
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/* Here if not setjmp support or if png_ptr is null. */
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PNG_ABORT();
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#ifndef PNG_CONSOLE_IO_SUPPORTED
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error_message = error_message; /* Make compiler happy */
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#endif
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}
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#ifdef PNG_WARNINGS_SUPPORTED
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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 warning_message)
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{
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#ifdef PNG_CONSOLE_IO_SUPPORTED
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# ifdef PNG_ERROR_NUMBERS_SUPPORTED
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if (*warning_message == PNG_LITERAL_SHARP)
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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] = warning_message[offset + 1];
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if (warning_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",
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warning_number, warning_message + offset);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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else
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{
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fprintf(stderr, "libpng warning: %s",
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warning_message);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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}
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else
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# endif
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{
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fprintf(stderr, "libpng warning: %s", warning_message);
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fprintf(stderr, PNG_STRING_NEWLINE);
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}
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#else
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warning_message = warning_message; /* Make compiler happy */
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#endif
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png_ptr = png_ptr; /* Make compiler happy */
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}
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#endif /* PNG_WARNINGS_SUPPORTED */
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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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if (png_ptr == NULL)
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return;
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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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if (png_ptr == NULL)
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return NULL;
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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 PNGAPI
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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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#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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