// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
#ifndef __BIT_ARRAY_H__
#define __BIT_ARRAY_H__

/*
 *  Copyright 2010 ZXing authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <zxing/ZXing.h>
#include <zxing/common/Counted.h>
#include <zxing/common/IllegalArgumentException.h>
#include <zxing/common/Array.h>
#include <vector>
#include <limits>
#include <iostream>

namespace zxing {

    class BitArray : public Counted {
    public:
        static const int bitsPerWord = std::numeric_limits<unsigned int>::digits;

    private:
        int size;
        ArrayRef<int> bits;
        static const int logBits = ZX_LOG_DIGITS(bitsPerWord);
        static const int bitsMask = (1 << logBits) - 1;

    public:
        BitArray(int size);
        ~BitArray();
        int getSize() const;

        bool get(int i) const {
            return (bits[i >> logBits] & (1 << (i & bitsMask))) != 0;
        }

        void set(int i) {
            bits[i >> logBits] |= 1 << (i & bitsMask);
        }

        int getNextSet(int from);
        int getNextUnset(int from);

        void setBulk(int i, int newBits);
        void setRange(int start, int end);
        void clear();
        bool isRange(int start, int end, bool value);
        std::vector<int>& getBitArray();

        void reverse();

        class Reverse {
        private:
            Ref<BitArray> array;
        public:
            Reverse(Ref<BitArray> array);
            ~Reverse();
        };

    private:
        static int makeArraySize(int size);
    };

    std::ostream& operator << (std::ostream&, BitArray const&);

}

#endif // __BIT_ARRAY_H__