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common/bitarray.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 COMMON_BITARRAY_H
+#define COMMON_BITARRAY_H
+
+#include "common/scummsys.h"
+
+namespace Common {
+
+class BitArray {
+public:
+	BitArray() {
+		_bitcount = 0;
+		_bits = nullptr;
+	}
+
+	explicit BitArray(uint bitcount) {
+		_bits = nullptr;
+		set_size(bitcount);
+	}
+
+	~BitArray() {
+		free(_bits);
+	}
+
+	void set_size(uint bitcount) {
+		free(_bits);
+		_bitcount = bitcount;
+		_bits = (byte*)malloc((bitcount + 7) / 8);
+		clear();
+	}
+	void set_bits(const byte *bits) {
+		memcpy(_bits, bits, (_bitcount + 7) / 8);
+	}
+
+	void clear() {
+		memset(_bits, 0, (_bitcount + 7) / 8);
+	}
+
+	void set(uint bit) {
+		_bits[bit / 8] |= (1 << (bit % 8));
+	}
+
+	void unset(uint bit) {
+		_bits[bit / 8] &= ~(1 << (bit % 8));
+	}
+
+	bool get(uint bit) const {
+		return _bits[bit / 8] & (1 << (bit % 8));
+	}
+
+	uint size() const {
+		return _bitcount;
+	}
+private:
+	uint _bitcount;
+	byte *_bits;
+};
+
+} // End of namespace Common
+
+#endif