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tlv.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
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13 // GNU General Public License for more details.
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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: tlv.hpp,v 1.2.2.2 2012/02/19 17:25:09 edrusb Rel $
22 //
23 /*********************************************************************/
24 
28 
29 #ifndef TLV_HPP
30 #define TLV_HPP
31 
32 #include "memory_file.hpp"
33 #include "storage.hpp"
34 
35 namespace libdar
36 {
39 
41 
44  class tlv
45  {
46  public:
47 
48  // constructors & Co.
49 
50  tlv() { type = 0; value = NULL; };
51  tlv(generic_file & f) { init(f); };
52  tlv(const tlv & ref) { copy_from(ref); };
53  ~tlv() { detruit(); };
54 
55  const tlv & operator = (const tlv & ref) { detruit(); copy_from(ref); return *this; };
56 
57  // methods (read / write tlv datastructure to file)
58 
59  void read(generic_file & f); //< same as the constructor but on an existing object
60  void write(generic_file & f) const; //< dumps the tlv contents to file
61 
62  // methods to fill the tlv object
63 
64  U_16 get_type() const { return type; }; //< get the TLV type
65  void set_type(U_16 val) { type = val; }; //< set the TLV type
66  void set_contents(const memory_file & contents); //< the generic_file object is provided to dump data to the tlv object
67  void get_contents(memory_file & contents) const; //< the generic_file object is provided to read data from the tlv object
68 
69 #ifdef LIBDAR_SPECIAL_ALLOC
70  USE_SPECIAL_ALLOC(tlv);
71 #endif
72  private:
73  U_16 type;
74  storage *value;
75 
76  void init(generic_file & f);
77  void copy_from(const tlv & ref);
78  void detruit() { if(value != NULL) { delete value; value = NULL; } };
79  };
80 
82 
83 } // end of namespace
84 
85 #endif
86 
87