/*
 * 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
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package org.apache.commons.compress.archivers.zip;

import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.compress.utils.BitInputStream;
import java.nio.ByteOrder;

Iterates over the bits of an InputStream. For each byte the bits are read from the right to the left.
Since:1.7
/** * Iterates over the bits of an InputStream. For each byte the bits * are read from the right to the left. * * @since 1.7 */
class BitStream extends BitInputStream { BitStream(final InputStream in) { super(in, ByteOrder.LITTLE_ENDIAN); }
Returns the next bit.
Returns:The next bit (0 or 1) or -1 if the end of the stream has been reached
/** * Returns the next bit. * * @return The next bit (0 or 1) or -1 if the end of the stream has been reached */
int nextBit() throws IOException { return (int) readBits(1); }
Returns the integer value formed by the n next bits (up to 8 bits).
Params:
  • n – the number of bits read (up to 8)
Returns:The value formed by the n bits, or -1 if the end of the stream has been reached
/** * Returns the integer value formed by the n next bits (up to 8 bits). * * @param n the number of bits read (up to 8) * @return The value formed by the n bits, or -1 if the end of the stream has been reached */
long nextBits(final int n) throws IOException { if (n < 0 || n > 8) { throw new IOException("Trying to read " + n + " bits, at most 8 are allowed"); } return readBits(n); } int nextByte() throws IOException { return (int) readBits(8); } }