# saveload_filter.h

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    00001 /* $Id: saveload_filter.h 21395 2010-12-05 14:41:34Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #ifndef SAVELOAD_FILTER_H
    00013 #define SAVELOAD_FILTER_H
    00014
    00016 struct LoadFilter {
    00018   LoadFilter *chain;
    00019
    00024   LoadFilter(LoadFilter *chain) : chain(chain)
    00025   {
    00026   }
    00027
    00029   virtual ~LoadFilter()
    00030   {
    00031     delete this->chain;
    00032   }
    00033
    00040   virtual size_t Read(byte *buf, size_t len) = 0;
    00041
    00045   virtual void Reset()
    00046   {
    00047     this->chain->Reset();
    00048   }
    00049 };
    00050
    00056 template <typename T> LoadFilter *CreateLoadFilter(LoadFilter *chain)
    00057 {
    00058   return new T(chain);
    00059 }
    00060
    00062 struct SaveFilter {
    00064   SaveFilter *chain;
    00065
    00070   SaveFilter(SaveFilter *chain) : chain(chain)
    00071   {
    00072   }
    00073
    00075   virtual ~SaveFilter()
    00076   {
    00077     delete this->chain;
    00078   }
    00079
    00085   virtual void Write(byte *buf, size_t len) = 0;
    00086
    00090   virtual void Finish()
    00091   {
    00092     if (this->chain != NULL) this->chain->Finish();
    00093   }
    00094 };
    00095
    00102 template <typename T> SaveFilter *CreateSaveFilter(SaveFilter *chain, byte compression_level)
    00103 {
    00104   return new T(chain, compression_level);
    00105 }
    00106
    00107 #endif /* SAVELOAD_FILTER_H */