mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
31aee0d0c0
Fixed point APIs are now supported throughout (no missing APIs).
Internal fixed point arithmetic support exists for all internal floating
point operations.
sCAL validates the floating point strings it is passed.
Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
Two new APIs exist to get the number of passes without turning on the
PNG_INTERLACE transform and to get the number of rows in the current
pass.
A new test program, pngvalid.c, validates the gamma code.
Errors in the 16 bit gamma correction (overflows) have been corrected.
cHRM chunk testing is done consistently (previously the floating point
API bypassed it, because the test really didn't work on FP, now the test
is performed on the actual values to be stored in the PNG file so it
works in the FP case too.)
Most floating point APIs now simply call the fixed point APIs after
converting the values to the fixed point form used in the PNG file.
The standard headers no longer include zlib.h, which is currently only
required for pngstruct.h and can therefore be internal.
(Patches by John Bowler)
448 lines
13 KiB
C
448 lines
13 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 [July 29, 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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#include "pngpriv.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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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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#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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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 && 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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void
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png_fixed_error(png_structp png_ptr, png_const_charp name, double value)
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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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/* To discover 'value' put a breakpoint here: */
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png_error(png_ptr, msg);
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value = value; png_ptr = png_ptr; /* Quiet the compiler */
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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->png_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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png_longjmp(png_ptr, 1);
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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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void PNGAPI
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png_longjmp(png_structp png_ptr, int val)
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{
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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 png_jmpbuf;
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png_memcpy(png_jmpbuf, png_ptr->png_jmpbuf, png_sizeof(jmp_buf));
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png_ptr->longjmp_fn(png_jmpbuf, val);
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}
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# else
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png_ptr->longjmp_fn(png_ptr->png_jmpbuf, val);
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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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}
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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->png_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 |
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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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