t42parse.c

a very goog book

                ft_strncmp( (const char*)cur, "ExpertEncoding", 14 ) == 0 )
        face->type1.encoding_type = T1_ENCODING_TYPE_EXPERT;

      else if ( cur + 18 < limit                                             &&
                ft_strncmp( (const char*)cur, "ISOLatin1Encoding", 17 ) == 0 )
        face->type1.encoding_type = T1_ENCODING_TYPE_ISOLATIN1;

      else {
        FT_ERROR(( "t42_parse_encoding: invalid token!\n" ));
        parser->root.error = T42_Err_Invalid_File_Format;
      }
    }
  }


  static FT_UInt
  t42_hexval( FT_Byte  v )
  {
    FT_UInt  d;
    
    d = (FT_UInt)( v - 'A' );
    if ( d < 6 )
    {
      d += 10;
      goto Exit;
    }
      
    d = (FT_UInt)( v - 'a' );
    if ( d < 6 )
    {
      d += 10;
      goto Exit;
    }
      
    d = (FT_UInt)( v - '0' );
    if ( d < 10 )
      goto Exit;
      
    d = 0;
 
  Exit:         
    return d;
  }


  static void
  t42_parse_sfnts( T42_Face    face,
                   T42_Loader  loader )
  {
    T42_Parser  parser = &loader->parser;
    FT_Memory   memory = parser->root.memory;
    FT_Byte*    cur    = parser->root.cursor;
    FT_Byte*    limit  = parser->root.limit;
    FT_Error    error;
    FT_Int      num_tables = 0, status;
    FT_ULong    count, ttf_size = 0, string_size = 0;
    FT_Bool     in_string  = 0;
    FT_Byte     v = 0;


    /* The format is `/sfnts [ <...> <...> ... ] def' */

    while ( t42_is_space( *cur ) )
      cur++;

    if (*cur++ == '[')
    {
      status = 0;
      count = 0;
    }
    else
    {
      FT_ERROR(( "t42_parse_sfnts: can't find begin of sfnts vector!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    while ( cur < limit - 2 )
    {
      while ( t42_is_space( *cur ) )
        cur++;

      switch ( *cur )
      {
      case ']':
        parser->root.cursor = cur++;
        return;

      case '<':
        in_string   = 1;
        string_size = 0;
        cur++;
        continue;

      case '>':
        if ( !in_string )
        {
          FT_ERROR(( "t42_parse_sfnts: found unpaired `>'!\n" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }

        /* A string can have, as a last byte,         */
        /* a zero byte for padding.  If so, ignore it */
        if ( ( v == 0 ) && ( string_size % 2 == 1 ) )
          count--;
        in_string = 0;
        cur++;
        continue;

      case '%':
        if ( !in_string )
        {
          /* Comment found; skip till end of line */
          while ( *cur != '\n' )
            cur++;
          continue;
        }
        else
        {
          FT_ERROR(( "t42_parse_sfnts: found `%' in string!\n" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }

      default:
        if ( !ft_xdigit( *cur ) || !ft_xdigit( *(cur + 1) ) )
        {
          FT_ERROR(( "t42_parse_sfnts: found non-hex characters in string" ));
          error = T42_Err_Invalid_File_Format;
          goto Fail;
        }

        v = (FT_Byte)( 16 * t42_hexval( cur[0] ) + t42_hexval( cur[1] ) );
        cur += 2;
        string_size++;
      }

      switch ( status )
      {
      case 0: /* The '[' was read, so load offset table, 12 bytes */
        if ( count < 12 )
        {
          face->ttf_data[count++] = v;
          continue;
        }
        else
        {
          num_tables = 16 * face->ttf_data[4] + face->ttf_data[5];
          status     = 1;
          ttf_size   = 12 + 16 * num_tables;

          if ( FT_REALLOC( face->ttf_data, 12, ttf_size ) )
            goto Fail;
        }
        /* No break, fall-through */

      case 1: /* The offset table is read; read now the table directory */
        if ( count < ttf_size )
        {
          face->ttf_data[count++] = v;
          continue;
        }
        else
        {
          int      i;
          FT_ULong len;


          for ( i = 0; i < num_tables; i++ )
          {
            FT_Byte*  p = face->ttf_data + 12 + 16*i + 12;
            
            len = FT_PEEK_ULONG( p );

            /* Pad to a 4-byte boundary length */
            ttf_size += ( len + 3 ) & ~3;
          }

          status         = 2;
          face->ttf_size = ttf_size;

          if ( FT_REALLOC( face->ttf_data, 12 + 16 * num_tables,
                           ttf_size + 1 ) )
            goto Fail;
        }
        /* No break, fall-through */

      case 2: /* We are reading normal tables; just swallow them */
        face->ttf_data[count++] = v;

      }
    }

    /* If control reaches this point, the format was not valid */
    error = T42_Err_Invalid_File_Format;

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


  static void
  t42_parse_charstrings( T42_Face    face,
                         T42_Loader  loader )
  {
    T42_Parser     parser     = &loader->parser;
    PS_Table       code_table = &loader->charstrings;
    PS_Table       name_table = &loader->glyph_names;
    FT_Memory      memory     = parser->root.memory;
    FT_Error       error;

    PSAux_Service  psaux      = (PSAux_Service)face->psaux;

    FT_Byte*       cur;
    FT_Byte*       limit      = parser->root.limit;
    FT_Int         n;


    loader->num_glyphs = T1_ToInt( parser );
    if ( parser->root.error )
      return;

    /* initialize tables */

    error = psaux->ps_table_funcs->init( code_table,
                                         loader->num_glyphs,
                                         memory );
    if ( error )
      goto Fail;

    error = psaux->ps_table_funcs->init( name_table,
                                         loader->num_glyphs,
                                         memory );
    if ( error )
      goto Fail;

    n = 0;

    for (;;)
    {
      /* the format is simple:                    */
      /*   `/glyphname' + index + def             */
      /*                                          */
      /* note that we stop when we find an `end'  */
      /*                                          */
      T1_Skip_Spaces( parser );

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

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

      if ( *cur != '/' )
        T1_Skip_Alpha( parser );
      else
      {
        FT_Byte*  cur2 = cur + 1;
        FT_Int    len;


        while ( cur2 < limit && t42_is_alpha( *cur2 ) )
          cur2++;
        len = (FT_Int)( 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->root.cursor = cur2;
        T1_Skip_Spaces( parser );

        cur2 = cur = parser->root.cursor;
        if ( cur >= limit )
          break;

        while ( cur2 < limit && t42_is_alpha( *cur2 ) )
          cur2++;
        len = (FT_Int)( cur2 - 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;
      }
    }

    /* Index 0 must be a .notdef element */
    if ( ft_strcmp( (char *)name_table->elements[0], ".notdef" ) )
    {
      FT_ERROR(( "t42_parse_charstrings: Index 0 is not `.notdef'!\n" ));
      error = T42_Err_Invalid_File_Format;
      goto Fail;
    }

    loader->num_glyphs = n;
    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;
      objects      = &dummy_object;
      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*    cur    = base;
    FT_Byte*    limit  = cur + size;
    FT_UInt     n_keywords = sizeof ( t42_keywords ) / 
                             sizeof ( t42_keywords[0] );


    parser->root.cursor = base;
    parser->root.limit  = base + size;
    parser->root.error  = 0;

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


        /* skip the `FontDirectory' keyword */
        cur += 13;
        cur2 = cur;

        /* lookup the `known' keyword */
        while ( cur < limit && *cur != 'k'           &&
                ft_strncmp( (char*)cur, "known", 5 ) )
          cur++;

        if ( cur < limit )
        {
          T1_TokenRec  token;


          /* skip the `known' keyword and the token following it */
          cur += 5;
          loader->parser.root.cursor = cur;
          T1_ToToken( &loader->parser, &token );

          /* if the last token was an array, skip it! */
          if ( token.type == T1_TOKEN_TYPE_ARRAY )
            cur2 = parser->root.cursor;
        }
        cur = cur2;
      }
      /* look for immediates */
      else if ( *cur == '/' && cur + 2 < limit )
      {
        FT_Byte*  cur2;
        FT_UInt    i, len;


        cur++;
        cur2 = cur;
        while ( cur2 < limit && t42_is_alpha( *cur2 ) )
          cur2++;

        len  = (FT_UInt)( cur2 - cur );
        if ( len > 0 && len < 22 ) /* XXX What shall it this 22? */
        {
          /* 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 ( ( len == ft_strlen( (const char *)name ) ) &&
                 ( ft_memcmp( cur, name, len ) == 0 )       )
            {
              /* we found it -- run the parsing callback! */
              parser->root.cursor = cur2;
              T1_Skip_Spaces( parser );
              parser->root.error = t42_load_keyword(face,
                                                    loader,
                                                    keyword );
              if ( parser->root.error )
                return parser->root.error;
              cur = parser->root.cursor;
              break;
            }
          }
        }
      }
    }
    return parser->root.error;
  }


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

    FT_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;
  }


  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 );

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


/* END */