Disk ARchive  2.5.9
Full featured and portable backup and archiving tool
memory_file.hpp
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2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
4 //
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9 //
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21 
25 
26 #ifndef MEMORY_FILE_HPP
27 #define MEMORY_FILE_HPP
28 
29 #include "generic_file.hpp"
30 #include "storage.hpp"
31 
32 namespace libdar
33 {
34 
37 
38  class memory_file : public generic_file
39  {
40  public:
41 
43  memory_file() : generic_file(gf_read_write), data(0) { position = 0; };
44 
45  // memory_storage specific methods
46 
47  void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };
48  infinint size() const { return data.size(); };
49 
50 
51  // virtual method inherited from generic_file
52  bool skippable(skippability direction, const infinint & amount) { return true; };
53  bool skip(const infinint & pos);
54  bool skip_to_eof();
55  bool skip_relative(S_I x);
56  infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; };
57 
58 
59  protected:
60 
61  // virtual method inherited from generic_file
62  void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here
63  U_I inherited_read(char *a, U_I size);
64  void inherited_write(const char *a, U_I size);
65  void inherited_sync_write() {};
66  void inherited_flush_read() {};
67  void inherited_terminate() {};
68 
69  private:
70  storage data;
71  infinint position;
72  };
73 
75 
76 } // end of namespace
77 
78 #endif
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
contains a class that permits arbitrary large data storage
generic_file(gf_mode m)
main constructor
bool is_terminated() const
read and write access
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47