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string_file.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
8 // of the License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 //
19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21 // $Id: string_file.hpp,v 1.10.2.1 2012/02/19 17:25:09 edrusb Rel $
22 //
23 /*********************************************************************/
24 //
25 
29 
30 #ifndef STRING_FILE_HPP
31 #define STRING_FILE_HPP
32 
33 #include "../my_config.h"
34 #include "infinint.hpp"
35 #include "generic_file.hpp"
36 #include "integers.hpp"
37 #include "erreurs.hpp"
38 
39 namespace libdar
40 {
41 
43 
45  class string_file : public generic_file
46  {
47  public:
48 
50  string_file(const std::string & contents): generic_file(gf_read_only) { data = contents; cur = 0; len = data.size(); };
51 
52  // inherited from generic_file
53  bool skip(const infinint & pos);
54  bool skip_to_eof() { cur = len; return true; };
55  bool skip_relative(S_I x);
56  infinint get_position() { return cur; };
57 
58 #ifdef LIBDAR_SPECIAL_ALLOC
59  USE_SPECIAL_ALLOC(string_file);
60 #endif
61  protected:
62  // inherited from generic_file
63  U_I inherited_read(char *a, U_I size);
64  void inherited_write(const char *a, U_I size) { throw Efeature("Writing on a string_file is not allowed"); };
67 
68  private:
69  std::string data;
70  infinint cur;
71  infinint len;
72  };
73 
74 } // end of namespace
75 
76 #endif