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/*
 * Copyright (c) 2021, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * 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.
 */

package boofcv.alg.fiducial.qrcode;

import java.util.Arrays;

/**
 * Stores a set of bits inside of an int array.
 *
 * @author Peter Abeles
 */
public class PackedBits32 implements PackedBits {
	/**
	 * Integer array used to store bits
	 */
	public int[] data = new int[1];
	/**
	 * Number of bits stored
	 */
	public int size;

	public PackedBits32( int totalBits ) {
		resize(totalBits);
	}

	public PackedBits32() {}

	public void setTo( PackedBits32 src ) {
		resize(src.size);
		System.arraycopy(src.data, 0, data, 0, src.arrayLength());
	}

	@Override
	public int get( int which ) {
		int index = which/32;
		int offset = which%32;

		return (data[index] >>> offset) & 1;
	}

	@Override
	public void set( int which, int value ) {
		int index = which/32;
		int offset = which%32;

		data[index] ^= (-value ^ data[index]) & (1 << offset);
	}

	@Override
	public void resize( int totalBits ) {
		this.size = totalBits;
		int N = totalBits/32 + (totalBits%32 > 0 ? 1 : 0);
		if (data.length < N) {
			data = new int[N];
		}
	}

	@Override
	public void zero() {
		int N = size/32;
		Arrays.fill(data, 0, N, 0);
	}

	@Override
	public int length() {
		return size;
	}

	@Override
	public int arrayLength() {
		return size/32 + ((size%32) > 0 ? 1 : 0);
	}

	@Override
	public int elementBits() {
		return 32;
	}
}