1 /* ScummVM - Graphic Adventure Engine 2 * 3 * ScummVM is the legal property of its developers, whose names 4 * are too numerous to list here. Please refer to the COPYRIGHT 5 * file distributed with this source distribution. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef BLADERUNNER_AUDIO_CACHE_H 24 #define BLADERUNNER_AUDIO_CACHE_H 25 26 #include "common/array.h" 27 #include "common/mutex.h" 28 29 namespace BladeRunner { 30 31 /* 32 * This is a poor imitation of Bladerunner's resource cache 33 */ 34 class AudioCache { 35 struct cacheItem { 36 int32 hash; 37 int refs; 38 uint lastAccess; 39 byte *data; 40 uint32 size; 41 }; 42 43 Common::Mutex _mutex; 44 Common::Array<cacheItem> _cacheItems; 45 46 uint32 _totalSize; 47 uint32 _maxSize; 48 uint32 _accessCounter; 49 50 public: 51 AudioCache(); 52 ~AudioCache(); 53 54 bool canAllocate(uint32 size) const; 55 bool dropOldest(); 56 byte *findByHash(int32 hash); 57 void storeByHash(int32 hash, Common::SeekableReadStream *stream); 58 59 void incRef(int32 hash); 60 void decRef(int32 hash); 61 }; 62 63 } // End of namespace BladeRunner 64 65 #endif 66