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tlv.hpp
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2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
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21 
25 
26 #ifndef TLV_HPP
27 #define TLV_HPP
28 
29 #include "memory_file.hpp"
30 #include "storage.hpp"
31 
32 namespace libdar
33 {
36 
38 
41  class tlv
42  {
43  public:
44 
45  // constructors & Co.
46 
47  tlv() { type = 0; value = NULL; };
48  tlv(generic_file & f) { init(f); };
49  tlv(const tlv & ref) { copy_from(ref); };
50  ~tlv() { detruit(); };
51 
52  const tlv & operator = (const tlv & ref) { detruit(); copy_from(ref); return *this; };
53 
54  // methods (read / write tlv datastructure to file)
55 
56  void read(generic_file & f); //< same as the constructor but on an existing object
57  void write(generic_file & f) const; //< dumps the tlv contents to file
58 
59  // methods to fill the tlv object
60 
61  U_16 get_type() const { return type; }; //< get the TLV type
62  void set_type(U_16 val) { type = val; }; //< set the TLV type
63  void set_contents(const memory_file & contents); //< the generic_file object is provided to dump data to the tlv object
64  void get_contents(memory_file & contents) const; //< the generic_file object is provided to read data from the tlv object
65 
66 #ifdef LIBDAR_SPECIAL_ALLOC
67  USE_SPECIAL_ALLOC(tlv);
68 #endif
69  private:
70  U_16 type;
71  storage *value;
72 
73  void init(generic_file & f);
74  void copy_from(const tlv & ref);
75  void detruit() { if(value != NULL) { delete value; value = NULL; } };
76  };
77 
79 
80 } // end of namespace
81 
82 #endif
83 
84 
the deleted file entry
Definition: catalogue.hpp:906
contains a class that permits arbitrary large data storage
Memory_file is a generic_file class that only uses virtual memory.
arbitrary large storage structure
Definition: storage.hpp:57
Type Length Value Structure.
Definition: tlv.hpp:41
this is the interface class from which all other data transfer classes inherit