/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.tsfile.common.bitStream;

/**
 * Base class for bit-level stream operations. Provides shared constants and bit masks for bitwise
 * manipulation.
 */
public class BitStream {

  /** Number of bits per byte (always 8) */
  protected static final int BITS_PER_BYTE = 8;

  /**
   * Bit masks used to extract the lowest N bits of a value. MASKS[n] contains a bitmask with the
   * lowest n bits set to 1. For example: MASKS[0] = 0b00000000 MASKS[1] = 0b00000001 MASKS[2] =
   * 0b00000011 ... MASKS[8] = 0b11111111
   */
  protected static final int[] MASKS = new int[] {0, 1, 3, 7, 0xf, 0x1f, 0x3f, 0x7f, 0xff};
}
