t1load.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

                            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;

    }
    else if ( !notdef_found )
    {
      /* notdef_index is already 0, or /.notdef is undefined in   */
      /* charstrings dictionary.  Worry about /.notdef undefined. */
      /* We take index 0 and add it to the end of the table(s)    */
      /* and add our own /.notdef glyph to index 0.               */

      /* 0 333 hsbw endchar */
      FT_Byte  notdef_glyph[] = {0x8B, 0xF7, 0xE1, 0x0D, 0x0E};
      char*    notdef_name    = (char *)".notdef";


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

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

      error = T1_Add_Table( name_table, 0, notdef_name, 8 );
      if ( error )
        goto Fail;

      error = T1_Add_Table( code_table, 0, notdef_glyph, 5 );

      if ( error )
        goto Fail;

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

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

      /* we added a glyph. */
      loader->num_glyphs = n + 1;
    }

    return;

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


  /*************************************************************************/
  /*                                                                       */
  /* Define the token field static variables.  This is a set of            */
  /* T1_FieldRec variables.                                                */
  /*                                                                       */
  /*************************************************************************/


  static
  const T1_FieldRec  t1_keywords[] =
  {

#include "t1tokens.h"

    /* now add the special functions... */
    T1_FIELD_CALLBACK( "FontMatrix",           parse_font_matrix,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "Encoding",             parse_encoding,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "Subrs",                parse_subrs,
                       T1_FIELD_DICT_PRIVATE )
    T1_FIELD_CALLBACK( "CharStrings",          parse_charstrings,
                       T1_FIELD_DICT_PRIVATE )
    T1_FIELD_CALLBACK( "Private",              parse_private,
                       T1_FIELD_DICT_FONTDICT )

#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
    T1_FIELD_CALLBACK( "BlendDesignPositions", parse_blend_design_positions,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "BlendDesignMap",       parse_blend_design_map,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "BlendAxisTypes",       parse_blend_axis_types,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "WeightVector",         parse_weight_vector,
                       T1_FIELD_DICT_FONTDICT )
    T1_FIELD_CALLBACK( "BuildCharArray",       parse_buildchar,
                       T1_FIELD_DICT_PRIVATE )
#endif

    { 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0, 0 }
  };


#define T1_FIELD_COUNT                                           \
          ( sizeof ( t1_keywords ) / sizeof ( t1_keywords[0] ) )


  static FT_Error
  parse_dict( T1_Face    face,
              T1_Loader  loader,
              FT_Byte*   base,
              FT_Long    size )
  {
    T1_Parser  parser = &loader->parser;
    FT_Byte   *limit, *start_binary = NULL;
    FT_Bool    have_integer = 0;


    parser->root.cursor = base;
    parser->root.limit  = base + size;
    parser->root.error  = T1_Err_Ok;

    limit = parser->root.limit;

    T1_Skip_Spaces( parser );

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


      cur = parser->root.cursor;

      /* look for `eexec' */
      if ( IS_PS_TOKEN( cur, limit, "eexec" ) )
        break;

      /* look for `closefile' which ends the eexec section */
      else if ( IS_PS_TOKEN( cur, limit, "closefile" ) )
        break;

      /* in a synthetic font the base font starts after a           */
      /* `FontDictionary' token that is placed after a Private dict */
      else if ( IS_PS_TOKEN( cur, limit, "FontDirectory" ) )
      {
        if ( loader->keywords_encountered & T1_PRIVATE )
          loader->keywords_encountered |=
            T1_FONTDIR_AFTER_PRIVATE;
        parser->root.cursor += 13;
      }

      /* check whether we have an integer */
      else if ( ft_isdigit( *cur ) )
      {
        start_binary = cur;
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          goto Exit;
        have_integer = 1;
      }

      /* in valid Type 1 fonts we don't see `RD' or `-|' directly */
      /* since those tokens are handled by parse_subrs and        */
      /* parse_charstrings                                        */
      else if ( *cur == 'R' && cur + 6 < limit && *(cur + 1) == 'D' &&
                have_integer )
      {
        FT_Long   s;
        FT_Byte*  b;


        parser->root.cursor = start_binary;
        if ( !read_binary_data( parser, &s, &b ) )
          return T1_Err_Invalid_File_Format;
        have_integer = 0;
      }

      else if ( *cur == '-' && cur + 6 < limit && *(cur + 1) == '|' &&
                have_integer )
      {
        FT_Long   s;
        FT_Byte*  b;


        parser->root.cursor = start_binary;
        if ( !read_binary_data( parser, &s, &b ) )
          return T1_Err_Invalid_File_Format;
        have_integer = 0;
      }

      /* 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 )
        {
          /* now compare the immediate name to the keyword table */
          T1_Field  keyword = (T1_Field)t1_keywords;


          for (;;)
          {
            FT_Byte*  name;


            name = (FT_Byte*)keyword->ident;
            if ( !name )
              break;

            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!     */
              /* We record every instance of every field      */
              /* (until we reach the base font of a           */
              /* synthetic font) to deal adequately with      */
              /* multiple master fonts; this is also          */
              /* necessary because later PostScript           */
              /* definitions override earlier ones.           */

              /* Once we encounter `FontDirectory' after      */
              /* `/Private', we know that this is a synthetic */
              /* font; except for `/CharStrings' we are not   */
              /* interested in anything that follows this     */
              /* `FontDirectory'.                             */

              /* MM fonts have more than one /Private token at */
              /* the top level; let's hope that all the junk   */
              /* that follows the first /Private token is not  */
              /* interesting to us.                            */

              /* According to Adobe Tech Note #5175 (CID-Keyed */
              /* Font Installation for ATM Software) a `begin' */
              /* must be followed by exactly one `end', and    */
              /* `begin' -- `end' pairs must be accurately     */
              /* paired.  We could use this to distinguish     */
              /* between the global Private and the Private    */
              /* dict that is a member of the Blend dict.      */

              const FT_UInt dict =
                ( loader->keywords_encountered & T1_PRIVATE )
                    ? T1_FIELD_DICT_PRIVATE
                    : T1_FIELD_DICT_FONTDICT;

              if ( !( dict & keyword->dict ) )
              {
                FT_TRACE1(( "parse_dict: found %s but ignoring it "
                            "since it is in the wrong dictionary\n",
                            keyword->ident ));
                break;
              }

              if ( !( loader->keywords_encountered &
                      T1_FONTDIR_AFTER_PRIVATE     )                  ||
                   ft_strcmp( (const char*)name, "CharStrings" ) == 0 )
              {
                parser->root.error = t1_load_keyword( face,
                                                      loader,
                                                      keyword );
                if ( parser->root.error != T1_Err_Ok )
                {
                  if ( FT_ERROR_BASE( parser->root.error ) == FT_Err_Ignore )
                    parser->root.error = T1_Err_Ok;
                  else
                    return parser->root.error;
                }
              }
              break;
            }

            keyword++;
          }
        }

        have_integer = 0;
      }
      else
      {
        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          goto Exit;
        have_integer = 0;
      }

      T1_Skip_Spaces( parser );
    }

  Exit:
    return parser->root.error;
  }


  static void
  t1_init_loader( T1_Loader  loader,
                  T1_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;
    loader->subrs.init           = 0;
    loader->swap_table.init      = 0;
    loader->fontdata             = 0;
    loader->keywords_encountered = 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->swap_table );
    T1_Release_Table( &loader->subrs );

    /* finalize parser */
    T1_Finalize_Parser( parser );
  }


  FT_LOCAL_DEF( FT_Error )
  T1_Open_Face( T1_Face  face )
  {
    T1_LoaderRec   loader;
    T1_Parser      parser;
    T1_Font        type1 = &face->type1;
    PS_Private     priv  = &type1->private_dict;
    FT_Error       error;

    PSAux_Service  psaux = (PSAux_Service)face->psaux;


    t1_init_loader( &loader, face );

    /* default values */
    face->ndv_idx          = -1;
    face->cdv_idx          = -1;
    face->len_buildchar    = 0;

    priv->blue_shift       = 7;
    priv->blue_fuzz        = 1;
    priv->lenIV            = 4;
    priv->expansion_factor = (FT_Fixed)( 0.06 * 0x10000L );
    priv->blue_scale       = (FT_Fixed)( 0.039625 * 0x10000L * 1000 );

    parser = &loader.parser;
    error  = T1_New_Parser( parser,
                            face->root.stream,
                            face->root.memory,
                            psaux );
    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, psaux );
    if ( error )
      goto Exit;

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

    /* ensure even-ness of `num_blue_values' */
    priv->num_blue_values &= ~1;

#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT

    if ( face->blend                                                     &&
         face->blend->num_default_design_vector != 0                     &&
         face->blend->num_defau