source/characterencoding.h

   1 /* This file is part of Shapes.
   2  *
   3  * Shapes is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 3 of the License, or
   6  * any later version.
   7  *
   8  * Shapes is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with Shapes.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Copyright 2008 Henrik Tidefelt
  17  */
  18
  19 #pragma once
  20
  21 #include "ptrowner.h"
  22 #include "charptrless.h"
  23
  24 #include <vector>
  25 #include <map>
  26 #include <iostream>
  27
  28 // This may not be the appropriate namespace...
  29 namespace FontMetrics
  30 {
  31
  32         class CharacterEncoding
  33         {
  34         public:
  35                 // A character encoding is a primitive thing which can only handle 256 code points.
  36                 typedef unsigned char PositionType;
  37         private:
  38                 RefCountPtr< const char > encodingName_;
  39
  40                 // This is only a memory, with no particular order of its items.
  41                 PtrOwner_back_Access< std::vector< const char * > > nameMem_;
  42
  43                 // This is idexed by size_t and maps to a name or a null pointer.
  44                 static const size_t TABLE_SIZE = 256;
  45                 std::vector< const char * > namePtrs_;
  46
  47                 // This is the reverse map.
  48                 std::map< const char *, PositionType, charPtrLess > nameMap_;
  49
  50         public:
  51                 CharacterEncoding( std::istream & iFile );
  52                 ~CharacterEncoding( );
  53
  54                 // Returns true on success.
  55                 bool position_to_name( PositionType code, const char ** dst ) const;
  56
  57                 // Returns true on success.
  58                 bool name_to_position( const char * name, PositionType * dst ) const;
  59
  60         private:
  61                 void readfile( std::istream & iFile );
  62                 static void getToken( std::istream & iFile, std::string * dst );
  63         };
  64
  65 }