1 /*
2  * Bittorrent Client using Qt and libtorrent.
3  * Copyright (C) 2020  Mike Tzou (Chocobo1)
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  * In addition, as a special exception, the copyright holders give permission to
20  * link this program with the OpenSSL project's "OpenSSL" library (or with
21  * modified versions of it that use the same license as the "OpenSSL" library),
22  * and distribute the linked executables. You must obey the GNU General Public
23  * License in all respects for all of the code used other than "OpenSSL".  If you
24  * modify file(s), you may extend this exception to your version of the file(s),
25  * but you are not obligated to do so. If you do not wish to do so, delete this
26  * exception statement from your version.
27  */
28 
29 #pragma once
30 
31 #include <iterator>
32 #include <memory>
33 
34 class QByteArray;
35 class QFileDevice;
36 
37 namespace Utils::IO
38 {
39     // A wrapper class that satisfy LegacyOutputIterator requirement
40     class FileDeviceOutputIterator
41     {
42     public:
43         // std::iterator_traits
44         using iterator_category = std::output_iterator_tag;
45         using difference_type = void;
46         using value_type = void;
47         using pointer = void;
48         using reference = void;
49 
50         explicit FileDeviceOutputIterator(QFileDevice &device, const int bufferSize = (4 * 1024));
51         FileDeviceOutputIterator(const FileDeviceOutputIterator &other) = default;
52         ~FileDeviceOutputIterator();
53 
54         // mimic std::ostream_iterator behavior
55         FileDeviceOutputIterator &operator=(char c);
56 
57         constexpr FileDeviceOutputIterator &operator*()
58         {
59             return *this;
60         }
61 
62         constexpr FileDeviceOutputIterator &operator++()
63         {
64             return *this;
65         }
66 
67         constexpr FileDeviceOutputIterator &operator++(int)
68         {
69             return *this;
70         }
71 
72     private:
73         QFileDevice *m_device;
74         std::shared_ptr<QByteArray> m_buffer;
75         int m_bufferSize;
76     };
77 }
78