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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 
25 
26 #ifndef STRING_FILE_HPP
27 #define STRING_FILE_HPP
28 
29 #include "../my_config.h"
30 #include "infinint.hpp"
31 #include "generic_file.hpp"
32 #include "integers.hpp"
33 #include "erreurs.hpp"
34 
35 namespace libdar
36 {
37 
39 
41  class string_file : public generic_file
42  {
43  public:
44 
46  string_file(const std::string & contents): generic_file(gf_read_only) { data = contents; cur = 0; len = data.size(); };
47 
48  // inherited from generic_file
49  bool skip(const infinint & pos);
50  bool skip_to_eof() { cur = len; return true; };
51  bool skip_relative(S_I x);
52  infinint get_position() { return cur; };
53 
54 #ifdef LIBDAR_SPECIAL_ALLOC
55  USE_SPECIAL_ALLOC(string_file);
56 #endif
57  protected:
58  // inherited from generic_file
59  U_I inherited_read(char *a, U_I size);
60  void inherited_write(const char *a, U_I size) { throw Efeature("Writing on a string_file is not allowed"); };
63 
64  private:
65  std::string data;
66  infinint cur;
67  infinint len;
68  };
69 
70 } // end of namespace
71 
72 #endif