t42parse.c

奇趣公司比较新的qt/emd版本

    for (;;)
    {
      /* The format is simple:                   */
      /*   `/glyphname' + index [+ def]          */

      T1_Skip_Spaces( parser );

      cur = parser->root.cursor;
      if ( cur >= limit )
        break;

      /* We stop when we find an `end' keyword or '>' */
      if ( *cur   == 'e'          &&
           cur + 3 < limit        &&
           cur[1] == 'n'          &&
           cur[2] == 'd'          &&
           t42_is_space( cur[3] ) )
        break;
      if ( *cur == '>' )
        break;

      T1_Skip_PS_Token( parser );
      if ( parser->root.error )
        return;

      if ( *cur == '/' )
      {
        FT_PtrDist  len;


        if ( cur + 1 >= limit )
        {
          FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }

        cur++;                              /* skip `/' */
        len = parser->root.cursor - cur;

        error = T1_Add_Table( name_table, n, cur, len + 1 );
        if ( error )
          goto Fail;

        /* add a trailing zero to the name table */
        name_table->elements[n][len] = '\0';

        /* record index of /.notdef */
        if ( *cur == '.'                                              &&
             ft_strcmp( ".notdef",
                        (const char*)(name_table->elements[n]) ) == 0 )
        {
          notdef_index = n;
          notdef_found = 1;
        }

        T1_Skip_Spaces( parser );

        cur = parser->root.cursor;

        (void)T1_ToInt( parser );
        if ( parser->root.cursor >= limit )
        {
          FT_ERROR(( "t42_parse_charstrings: out of bounds!\n" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }

        len = parser->root.cursor - cur;

        error = T1_Add_Table( code_table, n, cur, len + 1 );
        if ( error )
          goto Fail;

        code_table->elements[n][len] = '\0';

        n++;
        if ( n >= loader->num_glyphs )
          break;
      }
    }

    loader->num_glyphs = n;

    if ( !notdef_found )
    {
      FT_ERROR(( "t42_parse_charstrings: no /.notdef glyph!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    /* if /.notdef does not occupy index 0, do our magic. */
    if ( ft_strcmp( (const char*)".notdef",
                    (const char*)name_table->elements[0] ) )
    {
      /* Swap glyph in index 0 with /.notdef glyph.  First, add index 0  */
      /* name and code entries to swap_table.  Then place notdef_index   */
      /* name and code entries into swap_table.  Then swap name and code */
      /* entries at indices notdef_index and 0 using values stored in    */
      /* swap_table.                                                     */

      /* Index 0 name */
      error = T1_Add_Table( swap_table, 0,
                            name_table->elements[0],
                            name_table->lengths [0] );
      if ( error )
        goto Fail;

      /* Index 0 code */
      error = T1_Add_Table( swap_table, 1,
                            code_table->elements[0],
                            code_table->lengths [0] );
      if ( error )
        goto Fail;

      /* Index notdef_index name */
      error = T1_Add_Table( swap_table, 2,
                            name_table->elements[notdef_index],
                            name_table->lengths [notdef_index] );
      if ( error )
        goto Fail;

      /* Index notdef_index code */
      error = T1_Add_Table( swap_table, 3,
                            code_table->elements[notdef_index],
                            code_table->lengths [notdef_index] );
      if ( error )
        goto Fail;

      error = T1_Add_Table( name_table, notdef_index,
                            swap_table->elements[0],
                            swap_table->lengths [0] );
      if ( error )
        goto Fail;

      error = T1_Add_Table( code_table, notdef_index,
                            swap_table->elements[1],
                            swap_table->lengths [1] );
      if ( error )
        goto Fail;

      error = T1_Add_Table( name_table, 0,
                            swap_table->elements[2],
                            swap_table->lengths [2] );
      if ( error )
        goto Fail;

      error = T1_Add_Table( code_table, 0,
                            swap_table->elements[3],
                            swap_table->lengths [3] );
      if ( error )
        goto Fail;

    }

    return;

  Fail:
    parser->root.error = error;
  }


  static FT_Error
  t42_load_keyword( T42_Face    face,
                    T42_Loader  loader,
                    T1_Field    field )
  {
    FT_Error  error;
    void*     dummy_object;
    void**    objects;
    FT_UInt   max_objects = 0;


    /* if the keyword has a dedicated callback, call it */
    if ( field->type == T1_FIELD_TYPE_CALLBACK )
    {
      field->reader( (FT_Face)face, loader );
      error = loader->parser.root.error;
      goto Exit;
    }

    /* now the keyword is either a simple field or a table of fields; */
    /* we are now going to take care of it                            */

    switch ( field->location )
    {
    case T1_FIELD_LOCATION_FONT_INFO:
      dummy_object = &face->type1.font_info;
      break;

    case T1_FIELD_LOCATION_BBOX:
      dummy_object = &face->type1.font_bbox;
      break;

    default:
      dummy_object = &face->type1;
    }

    objects = &dummy_object;

    if ( field->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
         field->type == T1_FIELD_TYPE_FIXED_ARRAY   )
      error = T1_Load_Field_Table( &loader->parser, field,
                                   objects, max_objects, 0 );
    else
      error = T1_Load_Field( &loader->parser, field,
                             objects, max_objects, 0 );

   Exit:
    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  t42_parse_dict( T42_Face    face,
                  T42_Loader  loader,
                  FT_Byte*    base,
                  FT_Long     size )
  {
    T42_Parser  parser     = &loader->parser;
    FT_Byte*    limit;
    FT_Int      n_keywords = (FT_Int)( sizeof ( t42_keywords ) /
                                         sizeof ( t42_keywords[0] ) );


    parser->root.cursor = base;
    parser->root.limit  = base + size;
    parser->root.error  = T42_Err_Ok;

    limit = parser->root.limit;

    T1_Skip_Spaces( parser );

    while ( parser->root.cursor < limit )
    {
      FT_Byte*  cur;


      cur = parser->root.cursor;

      /* look for `FontDirectory' which causes problems for some fonts */
      if ( *cur == 'F' && cur + 25 < limit                    &&
           ft_strncmp( (char*)cur, "FontDirectory", 13 ) == 0 )
      {
        FT_Byte*  cur2;


        /* skip the `FontDirectory' keyword */
        T1_Skip_PS_Token( parser );
        T1_Skip_Spaces  ( parser );
        cur = cur2 = parser->root.cursor;

        /* look up the `known' keyword */
        while ( cur < limit )
        {
          if ( *cur == 'k' && cur + 5 < limit             &&
                ft_strncmp( (char*)cur, "known", 5 ) == 0 )
            break;

          T1_Skip_PS_Token( parser );
          if ( parser->root.error )
            goto Exit;
          T1_Skip_Spaces  ( parser );
          cur = parser->root.cursor;
        }

        if ( cur < limit )
        {
          T1_TokenRec  token;


          /* skip the `known' keyword and the token following it */
          T1_Skip_PS_Token( parser );
          T1_ToToken( parser, &token );

          /* if the last token was an array, skip it! */
          if ( token.type == T1_TOKEN_TYPE_ARRAY )
            cur2 = parser->root.cursor;
        }
        parser->root.cursor = cur2;
      }

      /* look for immediates */
      else if ( *cur == '/' && cur + 2 < limit )
      {
        FT_PtrDist  len;


        cur++;

        parser->root.cursor = cur;
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          goto Exit;

        len = parser->root.cursor - cur;

        if ( len > 0 && len < 22 && parser->root.cursor < limit )
        {
          int  i;


          /* now compare the immediate name to the keyword table */

          /* loop through all known keywords */
          for ( i = 0; i < n_keywords; i++ )
          {
            T1_Field  keyword = (T1_Field)&t42_keywords[i];
            FT_Byte   *name   = (FT_Byte*)keyword->ident;


            if ( !name )
              continue;

            if ( cur[0] == name[0]                                  &&
                 len == (FT_PtrDist)ft_strlen( (const char *)name ) &&
                 ft_memcmp( cur, name, len ) == 0                   )
            {
              /* we found it -- run the parsing callback! */
              parser->root.error = t42_load_keyword( face,
                                                     loader,
                                                     keyword );
              if ( parser->root.error )
                return parser->root.error;
              break;
            }
          }
        }
      }
      else
      {
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          goto Exit;
      }

      T1_Skip_Spaces( parser );
    }

  Exit:
    return parser->root.error;
  }


  FT_LOCAL_DEF( void )
  t42_loader_init( T42_Loader  loader,
                   T42_Face    face )
  {
    FT_UNUSED( face );

    FT_MEM_ZERO( loader, sizeof ( *loader ) );
    loader->num_glyphs = 0;
    loader->num_chars  = 0;

    /* initialize the tables -- simply set their `init' field to 0 */
    loader->encoding_table.init = 0;
    loader->charstrings.init    = 0;
    loader->glyph_names.init    = 0;
  }


  FT_LOCAL_DEF( void )
  t42_loader_done( T42_Loader  loader )
  {
    T42_Parser  parser = &loader->parser;


    /* finalize tables */
    T1_Release_Table( &loader->encoding_table );
    T1_Release_Table( &loader->charstrings );
    T1_Release_Table( &loader->glyph_names );
    T1_Release_Table( &loader->swap_table );

    /* finalize parser */
    t42_parser_done( parser );
  }


/* END */