nuclear@26: 
nuclear@26: /* pngerror.c - stub functions for i/o and memory allocation
nuclear@26:  *
nuclear@26:  * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@26:  * For conditions of distribution and use, see copyright notice in png.h
nuclear@26:  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26:  *
nuclear@26:  * This file provides a location for all error handling.  Users who
nuclear@26:  * need special error handling are expected to write replacement functions
nuclear@26:  * and use png_set_error_fn() to use those functions.  See the instructions
nuclear@26:  * at each function.
nuclear@26:  */
nuclear@26: 
nuclear@26: #define PNG_INTERNAL
nuclear@26: #include "png.h"
nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
nuclear@26: 
nuclear@26: static void /* PRIVATE */
nuclear@26: png_default_error PNGARG((png_structp png_ptr,
nuclear@26:   png_const_charp error_message));
nuclear@26: #ifndef PNG_NO_WARNINGS
nuclear@26: static void /* PRIVATE */
nuclear@26: png_default_warning PNGARG((png_structp png_ptr,
nuclear@26:   png_const_charp warning_message));
nuclear@26: #endif /* PNG_NO_WARNINGS */
nuclear@26: 
nuclear@26: /* This function is called whenever there is a fatal error.  This function
nuclear@26:  * should not be changed.  If there is a need to handle errors differently,
nuclear@26:  * you should supply a replacement error function and use png_set_error_fn()
nuclear@26:  * to replace the error function at run-time.
nuclear@26:  */
nuclear@26: #ifndef PNG_NO_ERROR_TEXT
nuclear@26: void PNGAPI
nuclear@26: png_error(png_structp png_ptr, png_const_charp error_message)
nuclear@26: {
nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26:    char msg[16];
nuclear@26:    if (png_ptr != NULL)
nuclear@26:    {
nuclear@26:      if (png_ptr->flags&
nuclear@26:        (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@26:      {
nuclear@26:        if (*error_message == '#')
nuclear@26:        {
nuclear@26:          /* Strip "#nnnn " from beginning of error message. */
nuclear@26:            int offset;
nuclear@26:            for (offset = 1; offset<15; offset++)
nuclear@26:               if (error_message[offset] == ' ')
nuclear@26:                   break;
nuclear@26:            if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@26:            {
nuclear@26:               int i;
nuclear@26:               for (i = 0; i < offset - 1; i++)
nuclear@26:                  msg[i] = error_message[i + 1];
nuclear@26:               msg[i - 1] = '\0';
nuclear@26:               error_message = msg;
nuclear@26:            }
nuclear@26:            else
nuclear@26:               error_message += offset;
nuclear@26:        }
nuclear@26:        else
nuclear@26:        {
nuclear@26:            if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
nuclear@26:            {
nuclear@26:               msg[0] = '0';
nuclear@26:               msg[1] = '\0';
nuclear@26:               error_message = msg;
nuclear@26:            }
nuclear@26:        }
nuclear@26:      }
nuclear@26:    }
nuclear@26: #endif
nuclear@26:    if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@26:       (*(png_ptr->error_fn))(png_ptr, error_message);
nuclear@26: 
nuclear@26:    /* If the custom handler doesn't exist, or if it returns,
nuclear@26:       use the default handler, which will not return. */
nuclear@26:    png_default_error(png_ptr, error_message);
nuclear@26: }
nuclear@26: #else
nuclear@26: void PNGAPI
nuclear@26: png_err(png_structp png_ptr)
nuclear@26: {
nuclear@26:    if (png_ptr != NULL && png_ptr->error_fn != NULL)
nuclear@26:       (*(png_ptr->error_fn))(png_ptr, '\0');
nuclear@26: 
nuclear@26:    /* If the custom handler doesn't exist, or if it returns,
nuclear@26:       use the default handler, which will not return. */
nuclear@26:    png_default_error(png_ptr, '\0');
nuclear@26: }
nuclear@26: #endif /* PNG_NO_ERROR_TEXT */
nuclear@26: 
nuclear@26: #ifndef PNG_NO_WARNINGS
nuclear@26: /* This function is called whenever there is a non-fatal error.  This function
nuclear@26:  * should not be changed.  If there is a need to handle warnings differently,
nuclear@26:  * you should supply a replacement warning function and use
nuclear@26:  * png_set_error_fn() to replace the warning function at run-time.
nuclear@26:  */
nuclear@26: void PNGAPI
nuclear@26: png_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@26: {
nuclear@26:    int offset = 0;
nuclear@26:    if (png_ptr != NULL)
nuclear@26:    {
nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26:    if (png_ptr->flags&
nuclear@26:      (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
nuclear@26: #endif
nuclear@26:      {
nuclear@26:        if (*warning_message == '#')
nuclear@26:        {
nuclear@26:            for (offset = 1; offset < 15; offset++)
nuclear@26:               if (warning_message[offset] == ' ')
nuclear@26:                   break;
nuclear@26:        }
nuclear@26:      }
nuclear@26:      if (png_ptr != NULL && png_ptr->warning_fn != NULL)
nuclear@26:         (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
nuclear@26:    }
nuclear@26:    else
nuclear@26:       png_default_warning(png_ptr, warning_message + offset);
nuclear@26: }
nuclear@26: #endif /* PNG_NO_WARNINGS */
nuclear@26: 
nuclear@26: 
nuclear@26: /* These utilities are used internally to build an error message that relates
nuclear@26:  * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
nuclear@26:  * this is used to prefix the message.  The message is limited in length
nuclear@26:  * to 63 bytes, the name characters are output as hex digits wrapped in []
nuclear@26:  * if the character is invalid.
nuclear@26:  */
nuclear@26: #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
nuclear@26: static PNG_CONST char png_digit[16] = {
nuclear@26:    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
nuclear@26:    'A', 'B', 'C', 'D', 'E', 'F'
nuclear@26: };
nuclear@26: 
nuclear@26: #define PNG_MAX_ERROR_TEXT 64
nuclear@26: 
nuclear@26: #if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
nuclear@26: static void /* PRIVATE */
nuclear@26: png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
nuclear@26:    error_message)
nuclear@26: {
nuclear@26:    int iout = 0, iin = 0;
nuclear@26: 
nuclear@26:    while (iin < 4)
nuclear@26:    {
nuclear@26:       int c = png_ptr->chunk_name[iin++];
nuclear@26:       if (isnonalpha(c))
nuclear@26:       {
nuclear@26:          buffer[iout++] = '[';
nuclear@26:          buffer[iout++] = png_digit[(c & 0xf0) >> 4];
nuclear@26:          buffer[iout++] = png_digit[c & 0x0f];
nuclear@26:          buffer[iout++] = ']';
nuclear@26:       }
nuclear@26:       else
nuclear@26:       {
nuclear@26:          buffer[iout++] = (png_byte)c;
nuclear@26:       }
nuclear@26:    }
nuclear@26: 
nuclear@26:    if (error_message == NULL)
nuclear@26:       buffer[iout] = '\0';
nuclear@26:    else
nuclear@26:    {
nuclear@26:       buffer[iout++] = ':';
nuclear@26:       buffer[iout++] = ' ';
nuclear@26:       png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
nuclear@26:       buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
nuclear@26:    }
nuclear@26: }
nuclear@26: 
nuclear@26: #ifdef PNG_READ_SUPPORTED
nuclear@26: void PNGAPI
nuclear@26: png_chunk_error(png_structp png_ptr, png_const_charp error_message)
nuclear@26: {
nuclear@26:    char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@26:    if (png_ptr == NULL)
nuclear@26:      png_error(png_ptr, error_message);
nuclear@26:    else
nuclear@26:    {
nuclear@26:      png_format_buffer(png_ptr, msg, error_message);
nuclear@26:      png_error(png_ptr, msg);
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif /* PNG_READ_SUPPORTED */
nuclear@26: #endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
nuclear@26: 
nuclear@26: #ifndef PNG_NO_WARNINGS
nuclear@26: void PNGAPI
nuclear@26: png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@26: {
nuclear@26:    char msg[18+PNG_MAX_ERROR_TEXT];
nuclear@26:    if (png_ptr == NULL)
nuclear@26:      png_warning(png_ptr, warning_message);
nuclear@26:    else
nuclear@26:    {
nuclear@26:      png_format_buffer(png_ptr, msg, warning_message);
nuclear@26:      png_warning(png_ptr, msg);
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif /* PNG_NO_WARNINGS */
nuclear@26: 
nuclear@26: 
nuclear@26: /* This is the default error handling function.  Note that replacements for
nuclear@26:  * this function MUST NOT RETURN, or the program will likely crash.  This
nuclear@26:  * function is used by default, or if the program supplies NULL for the
nuclear@26:  * error function pointer in png_set_error_fn().
nuclear@26:  */
nuclear@26: static void /* PRIVATE */
nuclear@26: png_default_error(png_structp png_ptr, png_const_charp error_message)
nuclear@26: {
nuclear@26: #ifndef PNG_NO_CONSOLE_IO
nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26:    if (*error_message == '#')
nuclear@26:    {
nuclear@26:      /* Strip "#nnnn " from beginning of warning message. */
nuclear@26:      int offset;
nuclear@26:      char error_number[16];
nuclear@26:      for (offset = 0; offset<15; offset++)
nuclear@26:      {
nuclear@26:          error_number[offset] = error_message[offset + 1];
nuclear@26:          if (error_message[offset] == ' ')
nuclear@26:              break;
nuclear@26:      }
nuclear@26:      if ((offset > 1) && (offset < 15))
nuclear@26:      {
nuclear@26:        error_number[offset - 1] = '\0';
nuclear@26:        fprintf(stderr, "libpng error no. %s: %s\n", error_number,
nuclear@26:           error_message + offset + 1);
nuclear@26:      }
nuclear@26:      else
nuclear@26:        fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
nuclear@26:    }
nuclear@26:    else
nuclear@26: #endif
nuclear@26:    fprintf(stderr, "libpng error: %s\n", error_message);
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_SETJMP_SUPPORTED
nuclear@26:    if (png_ptr)
nuclear@26:    {
nuclear@26: #  ifdef USE_FAR_KEYWORD
nuclear@26:    {
nuclear@26:       jmp_buf jmpbuf;
nuclear@26:       png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@26:       longjmp(jmpbuf, 1);
nuclear@26:    }
nuclear@26: #  else
nuclear@26:    longjmp(png_ptr->jmpbuf, 1);
nuclear@26: #  endif
nuclear@26:    }
nuclear@26: #else
nuclear@26:    PNG_ABORT();
nuclear@26: #endif
nuclear@26: #ifdef PNG_NO_CONSOLE_IO
nuclear@26:    error_message = error_message; /* make compiler happy */
nuclear@26: #endif
nuclear@26: }
nuclear@26: 
nuclear@26: #ifndef PNG_NO_WARNINGS
nuclear@26: /* This function is called when there is a warning, but the library thinks
nuclear@26:  * it can continue anyway.  Replacement functions don't have to do anything
nuclear@26:  * here if you don't want them to.  In the default configuration, png_ptr is
nuclear@26:  * not used, but it is passed in case it may be useful.
nuclear@26:  */
nuclear@26: static void /* PRIVATE */
nuclear@26: png_default_warning(png_structp png_ptr, png_const_charp warning_message)
nuclear@26: {
nuclear@26: #ifndef PNG_NO_CONSOLE_IO
nuclear@26: #  ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26:    if (*warning_message == '#')
nuclear@26:    {
nuclear@26:      int offset;
nuclear@26:      char warning_number[16];
nuclear@26:      for (offset = 0; offset < 15; offset++)
nuclear@26:      {
nuclear@26:         warning_number[offset] = warning_message[offset + 1];
nuclear@26:         if (warning_message[offset] == ' ')
nuclear@26:             break;
nuclear@26:      }
nuclear@26:      if ((offset > 1) && (offset < 15))
nuclear@26:      {
nuclear@26:        warning_number[offset + 1] = '\0';
nuclear@26:        fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
nuclear@26:           warning_message + offset);
nuclear@26:      }
nuclear@26:      else
nuclear@26:        fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@26:    }
nuclear@26:    else
nuclear@26: #  endif
nuclear@26:      fprintf(stderr, "libpng warning: %s\n", warning_message);
nuclear@26: #else
nuclear@26:    warning_message = warning_message; /* make compiler happy */
nuclear@26: #endif
nuclear@26:    png_ptr = png_ptr; /* make compiler happy */
nuclear@26: }
nuclear@26: #endif /* PNG_NO_WARNINGS */
nuclear@26: 
nuclear@26: /* This function is called when the application wants to use another method
nuclear@26:  * of handling errors and warnings.  Note that the error function MUST NOT
nuclear@26:  * return to the calling routine or serious problems will occur.  The return
nuclear@26:  * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
nuclear@26:  */
nuclear@26: void PNGAPI
nuclear@26: png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
nuclear@26:    png_error_ptr error_fn, png_error_ptr warning_fn)
nuclear@26: {
nuclear@26:    if (png_ptr == NULL)
nuclear@26:       return;
nuclear@26:    png_ptr->error_ptr = error_ptr;
nuclear@26:    png_ptr->error_fn = error_fn;
nuclear@26:    png_ptr->warning_fn = warning_fn;
nuclear@26: }
nuclear@26: 
nuclear@26: 
nuclear@26: /* This function returns a pointer to the error_ptr associated with the user
nuclear@26:  * functions.  The application should free any memory associated with this
nuclear@26:  * pointer before png_write_destroy and png_read_destroy are called.
nuclear@26:  */
nuclear@26: png_voidp PNGAPI
nuclear@26: png_get_error_ptr(png_structp png_ptr)
nuclear@26: {
nuclear@26:    if (png_ptr == NULL)
nuclear@26:       return NULL;
nuclear@26:    return ((png_voidp)png_ptr->error_ptr);
nuclear@26: }
nuclear@26: 
nuclear@26: 
nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26: void PNGAPI
nuclear@26: png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
nuclear@26: {
nuclear@26:    if (png_ptr != NULL)
nuclear@26:    {
nuclear@26:      png_ptr->flags &=
nuclear@26:        ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
nuclear@26:    }
nuclear@26: }
nuclear@26: #endif
nuclear@26: #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */