Disk ARchive: secu_memory_file.hpp Source File

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secu_memory_file.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2025 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
25
26#ifndef SECU_MEMORY_FILE_HPP
27#define SECU_MEMORY_FILE_HPP
28
29#include "generic_file.hpp"
30#include "storage.hpp"
31#include "secu_string.hpp"
32
33namespace libdar
34{
35
38
39 class secu_memory_file : public generic_file
40 {
41 public:
42
43 // Constructors & Destructor
44 secu_memory_file(U_I storage_size) : generic_file(gf_read_write), data(storage_size) { position = 0; };
45 secu_memory_file(const secu_memory_file & ref) = default;
46 secu_memory_file(secu_memory_file && ref) noexcept = default;
47 secu_memory_file & operator = (const secu_memory_file & ref) = default;
48 secu_memory_file & operator = (secu_memory_file && ref) noexcept = default;
49 ~secu_memory_file() = default;
50
51 // memory_storage specific methods
52
54 void reset(U_I size) { if(is_terminated()) throw SRC_BUG; position = 0; data.resize(size); };
55
57 infinint get_size() const { return data.get_size(); };
58
60 infinint get_allocated_size() const { return data.get_allocated_size(); };
61
63 void randomize(U_I size) { if(size > data.get_allocated_size()) reset(size); data.randomize(size); };
64
65
66 // virtual method inherited from generic_file
67 virtual bool skippable(skippability direction, const infinint & amount) override { return true; };
68 virtual bool skip(const infinint & pos) override;
69 virtual bool skip_to_eof() override;
70 virtual bool skip_relative(S_I x) override;
71 virtual bool truncatable(const infinint & pos) const override { return false; };
72 virtual infinint get_position() const override { if(is_terminated()) throw SRC_BUG; return position; };
73
74 const secu_string & get_contents() const { return data; };
75
76 protected:
77
78 // virtual method inherited from generic_file
79 virtual void inherited_read_ahead(const infinint & amount) override {};
80 virtual U_I inherited_read(char *a, U_I size) override;
81 virtual void inherited_write(const char *a, U_I size) override;
82 virtual void inherited_truncate(const infinint & pos) override { throw Efeature("truncate a secu_memory_file object"); };
83 virtual void inherited_sync_write() override {};
84 virtual void inherited_flush_read() override {};
85 virtual void inherited_terminate() override {};
86
87 private:
88 secu_string data;
89 U_I position;
90 };
91
93
94} // end of namespace
95
96#endif
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition generic_file.hpp:77
libdar::generic_file::inherited_sync_write
virtual void inherited_sync_write()=0
write down any pending data
libdar::generic_file::generic_file
generic_file(gf_mode m)
main constructor
Definition generic_file.hpp:80
libdar::generic_file::get_position
virtual infinint get_position() const =0
get the current read/write position
libdar::generic_file::skip_to_eof
virtual bool skip_to_eof()=0
skip to the end of file
libdar::generic_file::is_terminated
bool is_terminated() const
Definition generic_file.hpp:328
libdar::generic_file::inherited_terminate
virtual void inherited_terminate()=0
destructor-like call, except that it is allowed to throw exceptions
libdar::generic_file::inherited_flush_read
virtual void inherited_flush_read()=0
reset internal engine, flush caches in order to read the data at current position
generic_file.hpp
class generic_file is defined here as well as class fichier
libdar::gf_read_write
@ gf_read_write
read and write access
Definition gf_mode.hpp:47
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47
secu_string.hpp
this file contains the definition of secu_string class, a std::string like class but allocated in sec...
storage.hpp
contains a class that permits arbitrary large data storage