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402 lines
12 KiB
402 lines
12 KiB
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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 1.4.0 [January 3, 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_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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