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engines/bladerunner/audio_cache.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef BLADERUNNER_AUDIO_CACHE_H
+#define BLADERUNNER_AUDIO_CACHE_H
+
+#include "common/array.h"
+#include "common/mutex.h"
+
+namespace BladeRunner {
+
+/*
+ * This is a poor imitation of Bladerunner's resource cache
+ */
+class AudioCache {
+	struct cacheItem {
+		int32   hash;
+		int     refs;
+		uint    lastAccess;
+		byte   *data;
+		uint32  size;
+	};
+
+	Common::Mutex            _mutex;
+	Common::Array<cacheItem> _cacheItems;
+
+	uint32 _totalSize;
+	uint32 _maxSize;
+	uint32 _accessCounter;
+
+public:
+	AudioCache();
+	~AudioCache();
+
+	bool  canAllocate(uint32 size) const;
+	bool  dropOldest();
+	byte *findByHash(int32 hash);
+	void  storeByHash(int32 hash, Common::SeekableReadStream *stream);
+
+	void  incRef(int32 hash);
+	void  decRef(int32 hash);
+};
+
+} // End of namespace BladeRunner
+
+#endif