+
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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 1.2.37 [June 4, 2009]+
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 * Copyright (c) 1998-2009 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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+
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#define PNG_INTERNAL+
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#include "png.h"+
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)+
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+
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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));+
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#ifndef PNG_NO_WARNINGS+
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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_NO_WARNINGS */+
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+
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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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#ifndef PNG_NO_ERROR_TEXT+
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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 == '#')+
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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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+
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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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+
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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_NO_ERROR_TEXT */+
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+
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#ifndef PNG_NO_WARNINGS+
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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 == '#')+
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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_NO_WARNINGS */+
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+
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+
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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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+
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#define PNG_MAX_ERROR_TEXT 64+
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+
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#if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)+
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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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+
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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++] = '[';+
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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++] = ']';+
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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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+
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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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+
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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 /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */+
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+
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#ifndef PNG_NO_WARNINGS+
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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_NO_WARNINGS */+
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+
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+
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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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#ifndef PNG_NO_CONSOLE_IO+
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED+
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   if (*error_message == '#')+
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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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+
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#ifdef PNG_SETJMP_SUPPORTED+
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   if (png_ptr)+
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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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      longjmp(jmpbuf, 1);+
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   }+
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#  else+
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   longjmp(png_ptr->jmpbuf, 1);+
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#  endif+
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   }+
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#else+
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   PNG_ABORT();+
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#endif+
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#ifdef PNG_NO_CONSOLE_IO+
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   error_message = error_message; /* Make compiler happy */+
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#endif+
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}+
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+
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#ifndef PNG_NO_WARNINGS+
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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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#ifndef PNG_NO_CONSOLE_IO+
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#  ifdef PNG_ERROR_NUMBERS_SUPPORTED+
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   if (*warning_message == '#')+
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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_NO_WARNINGS */+
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+
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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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+
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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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+
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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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