t1load.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

        face->type1.encoding_type = t1_encoding_standard;
        
      else if ( cur+15 < limit &&
                strncmp( (const char*)cur, "ExpertEncoding", 14 ) == 0 )
        face->type1.encoding_type = t1_encoding_expert;

      else
      {
        FT_ERROR(( "type1.parse_encoding: invalid token !!\n" ));
        parser->error = FT_Err_Invalid_File_Format;
      }      
    }
  }


  static
  void  parse_subrs( T1_Face  face, T1_Loader*  loader )
  {
    T1_Parser*  parser = &loader->parser;
    T1_Table*   table  = &loader->subrs;
    FT_Memory   memory = parser->memory;
    FT_Error    error;
    T1_Int      n;
    
    loader->num_subrs = T1_ToInt( parser );    
    if (parser->error) return;
    
    /* initialise subrs array */
    error = T1_New_Table( table, loader->num_subrs, memory );
    if (error) goto Fail;

    /* the format is simple :                                */
    /*                                                       */
    /*   "index" + binary data                               */
    /*                                                       */
    
    for ( n = 0; n < loader->num_subrs; n++ )
    {
      T1_Int    index, size;
      T1_Byte*  base;
      
      index = T1_ToInt(parser);
      if (!read_binary_data(parser,&size,&base)) return;
      
      T1_Decrypt( base, size, 4330 );      
      size -= face->type1.lenIV;
      base += face->type1.lenIV;

      error = T1_Add_Table( table, index, base, size );
      if (error) goto Fail;
    }
    return;

  Fail:
    parser->error = error;
  }




  static
  void  parse_charstrings( T1_Face  face, T1_Loader*  loader )
  {
    T1_Parser*  parser     = &loader->parser;
    T1_Table*   code_table = &loader->charstrings;
    T1_Table*   name_table = &loader->glyph_names;
    FT_Memory   memory     = parser->memory;
    FT_Error    error;

    T1_Byte*    cur;
    T1_Byte*    limit = parser->limit;
    T1_Int      n;
    
    loader->num_glyphs = T1_ToInt( parser );    
    if (parser->error) return;
    
    /* initialise tables */
    error = T1_New_Table( code_table, loader->num_glyphs, memory ) ||
            T1_New_Table( name_table, loader->num_glyphs, memory );
    if (error) goto Fail;
    
    n = 0;
    for ( ;; )
    {
      T1_Int    size;
      T1_Byte*  base;
      
      /* the format is simple :                   */
      /*   "/glyphname" + binary data             */
      /*                                          */
      /* note that we stop when we find a "def"   */
      /*                                          */
      skip_whitespace(parser);
      cur = parser->cursor;
      if (cur >= limit) break;

      /* we stop when we find a "def" or "end" keyword */
      if (*cur    == 'd' && 
           cur+3 < limit &&
           cur[1] == 'e' &&
           cur[2] == 'f' )
        break;

      if (*cur == 'e'   &&
          cur+3 < limit &&
          cur[1] == 'n' &&
          cur[2] == 'd' )
        break;

      if (*cur != '/')
        skip_blackspace(parser);
      else
      {
        T1_Byte*  cur2 = cur+1;
        T1_Int    len;
        
        while (cur2 < limit && is_alpha(*cur2)) cur2++;
        len = cur2-cur-1;
        
        error = T1_Add_Table( name_table, n, cur+1, len+1 );
        if (error) goto Fail;
       
        /* add a trailing zero to the name table */
        name_table->elements[n][len] = '\0';
       
        parser->cursor = cur2; 
        if (!read_binary_data(parser,&size,&base)) return;

        T1_Decrypt( base, size, 4330 );      
        size -= face->type1.lenIV;
        base += face->type1.lenIV;

        error = T1_Add_Table( code_table, n, base, size );
        if (error) goto Fail;
        
        n++;
        if (n >= loader->num_glyphs)
          break;
      }
    }
    loader->num_glyphs = n;
    return;
    
  Fail:
    parser->error = error;
  }


#undef PARSE_STRING
#undef PARSE_INT
#undef PARSE_NUM
#undef PARSE_BOOL
#undef PARSE_FIXED
#undef PARSE_COORDS
#undef PARSE_FIXEDS
#undef PARSE_COORDS2
#undef PARSE_FIXEDS2

#undef PARSE_
#define PARSE_(s,x)   { s, parse_##x },

#define PARSE_STRING(s,x)      PARSE_(s,x)
#define PARSE_INT(s,x)         PARSE_(s,x)
#define PARSE_NUM(s,x,t)       PARSE_(s,x)
#define PARSE_BOOL(s,x)        PARSE_(s,x)
#define PARSE_FIXED(s,x)       PARSE_(s,x)
#define PARSE_COORDS(s,c,m,x)  PARSE_(s,x)
#define PARSE_FIXEDS(s,c,m,x)  PARSE_(s,x)
#define PARSE_COORDS2(s,m,x)   PARSE_(s,x)
#define PARSE_FIXEDS2(s,m,x)   PARSE_(s,x)

  static
  const T1_KeyWord  t1_keywords[] =
  {
#include <t1tokens.h>
    /* now add the special functions... */
    { "FontName",    parse_font_name   },
    { "FontBBox",    parse_font_bbox   },
    { "Encoding",    parse_encoding    },
    { "Subrs",       parse_subrs       },
    { "CharStrings", parse_charstrings },
    { 0, 0 }
  };


  static
  T1_Error  parse_dict( T1_Face     face,
                        T1_Loader*  loader,
                        T1_Byte*    base,
                        T1_Long     size )
  {
    T1_Parser*  parser = &loader->parser;
    
    parser->cursor = base;
    parser->limit  = base + size;
    parser->error  = 0;
    
    {
      T1_Byte*  cur     = base;
      T1_Byte*  limit   = cur + size;
      
      for ( ;cur < limit; cur++ )
      {
        /* look for immediates */
        if (*cur == '/' && cur+2 < limit)
        {
          T1_Byte* cur2;
          T1_Int   len;
          
          cur  ++;
          cur2 = cur;
          while (cur2 < limit && is_alpha(*cur2)) cur2++;
          len  = cur2-cur;
          
          if (len > 0 && len < 20)
          {
            /* now, compare the immediate name to the keyword table */
            T1_KeyWord*  keyword = (T1_KeyWord*)t1_keywords;
            
            for (;;)
            {
              T1_Byte*  name;
              
              name = (T1_Byte*)keyword->name;
              if (!name) break;

              if ( cur[0] == name[0] &&
                   len == (T1_Int)strlen((const char*)name) )
              {
                T1_Int  n;
                for ( n = 1; n < len; n++ )
                  if (cur[n] != name[n])
                    break;
                    
                if (n >= len)
                {
                  /* we found it - run the parsing callback !! */
                  parser->cursor = cur2;
                  skip_whitespace( parser );
                  keyword->parsing( face, loader );
                  if (parser->error)
                    return parser->error;

                  cur = parser->cursor;
                  break;
                }
              }
              keyword++;
            }
          }
        }
      }
    }
    return parser->error;
  }

  static
  void t1_init_loader( T1_Loader* loader, T1_Face  face )
  {
    MEM_Set( loader, 0, 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;
    loader->subrs.init          = 0;
  }
  
  static
  void t1_done_loader( T1_Loader* loader )
  {
    T1_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->subrs );
    
    /* finalize parser */
    T1_Done_Parser( parser );
  }

  LOCAL_FUNC
  T1_Error  T1_Open_Face( T1_Face  face )
  {
    T1_Loader  loader;
    T1_Parser* parser;
    T1_Font*   type1 = &face->type1;
    FT_Error   error;

    t1_init_loader( &loader, face );

    /* default lenIV */
    type1->lenIV = 4;
    
    parser = &loader.parser;
    error = T1_New_Parser( parser, face->root.stream, face->root.memory );
    if (error) goto Exit;

    error = parse_dict( face, &loader, parser->base_dict, parser->base_len );
    if (error) goto Exit;
    
    error = T1_Get_Private_Dict( parser );
    if (error) goto Exit;
    
    error = parse_dict( face, &loader, parser->private_dict, parser->private_len );
    if (error) goto Exit;    

    /* now, propagate the subrs, charstrings and glyphnames tables */
    /* to the Type1 data                                           */
    type1->num_glyphs = loader.num_glyphs;
    
    if ( !loader.subrs.init )
    {
      FT_ERROR(( "T1.Open_Face: no subrs array in face !!\n" ));
      error = FT_Err_Invalid_File_Format;
    }
    
    if ( !loader.charstrings.init )
    {
      FT_ERROR(( "T1.Open_Face: no charstrings array in face !!\n" ));
      error = FT_Err_Invalid_File_Format;
    }
    
    loader.subrs.init  = 0;
    type1->num_subrs   = loader.num_subrs;
    type1->subrs_block = loader.subrs.block;
    type1->subrs       = loader.subrs.elements;
    type1->subrs_len   = loader.subrs.lengths;
    
    loader.charstrings.init  = 0;
    type1->charstrings_block = loader.charstrings.block;
    type1->charstrings       = loader.charstrings.elements;
    type1->charstrings_len   = loader.charstrings.lengths;
    
    /* we copy the glyph names "block" and "elements" fields */
    /* but the "lengths" field must be released later..      */
    type1->glyph_names_block    = loader.glyph_names.block;
    type1->glyph_names          = (T1_String**)loader.glyph_names.elements;
    loader.glyph_names.block    = 0;
    loader.glyph_names.elements = 0;

    /* we must now build type1.encoding when we have a custom */
    /* array..                                                */
    if ( type1->encoding_type == t1_encoding_array )
    {
      T1_Int    charcode, index, min_char, max_char;
      T1_Byte*  char_name;
      T1_Byte*  glyph_name;

      /* OK, we do the following : for each element in the encoding */
      /* table, lookup the index of the glyph having the same name  */
      /* the index is then stored in type1.encoding.char_index, and */
      /* a the name to type1.encoding.char_name                     */
      
      min_char = +32000;
      max_char = -32000;
      
      charcode = 0;
      for ( ; charcode < loader.encoding_table.num_elems; charcode++ )
      {
        type1->encoding.char_index[charcode] = 0;
        type1->encoding.char_name [charcode] = ".notdef";
        
        char_name = loader.encoding_table.elements[charcode];
        if (char_name)
          for ( index = 0; index < type1->num_glyphs; index++ )
          {
            glyph_name = (T1_Byte*)type1->glyph_names[index];
            if ( strcmp( (const char*)char_name,
                         (const char*)glyph_name ) == 0 )
            {
              type1->encoding.char_index[charcode] = index;
              type1->encoding.char_name [charcode] = (char*)glyph_name;
              
              if (charcode < min_char) min_char = charcode;
              if (charcode > max_char) max_char = charcode;
              break;
            }
          }
      }
      type1->encoding.code_first = min_char;
      type1->encoding.code_last  = max_char;
      type1->encoding.num_chars  = loader.num_chars;
   }
    
  Exit:
    t1_done_loader( &loader );
    return error;
  }