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saveload_filter.h
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1 /* $Id: saveload_filter.h 21395 2010-12-05 14:41:34Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8 */
9
12 #ifndef SAVELOAD_FILTER_H
13 #define SAVELOAD_FILTER_H
14
16 struct LoadFilter {
18 LoadFilter *chain;
19
24 LoadFilter(LoadFilter *chain) : chain(chain)
25 {
26 }
27
29 virtual ~LoadFilter()
30 {
31 delete this->chain;
32 }
33
40 virtual size_t Read(byte *buf, size_t len) = 0;
41
45 virtual void Reset()
46 {
47 this->chain->Reset();
48 }
49 };
50
56 template <typename T> LoadFilter *CreateLoadFilter(LoadFilter *chain)
57 {
58 return new T(chain);
59 }
60
62 struct SaveFilter {
64 SaveFilter *chain;
65
70 SaveFilter(SaveFilter *chain) : chain(chain)
71 {
72 }
73
75 virtual ~SaveFilter()
76 {
77 delete this->chain;
78 }
79
85 virtual void Write(byte *buf, size_t len) = 0;
86
90 virtual void Finish()
91 {
92 if (this->chain != NULL) this->chain->Finish();
93 }
94 };
95
102 template <typename T> SaveFilter *CreateSaveFilter(SaveFilter *chain, byte compression_level)
103 {
104 return new T(chain, compression_level);
105 }
106
107 #endif /* SAVELOAD_FILTER_H */