| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.sun.org.apache.bcel.internal.util; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInputStream; |
| |
| /** |
| * Utility class that implements a sequence of bytes which can be read |
| * via the `readByte()' method. This is used to implement a wrapper for the |
| * Java byte code stream to gain some more readability. |
| * |
| * @version $Id: ByteSequence.java 1747278 2016-06-07 17:28:43Z britter $ |
| */ |
| public final class ByteSequence extends DataInputStream { |
| |
| private final ByteArrayStream byteStream; |
| |
| |
| public ByteSequence(final byte[] bytes) { |
| super(new ByteArrayStream(bytes)); |
| byteStream = (ByteArrayStream) in; |
| } |
| |
| |
| public final int getIndex() { |
| return byteStream.getPosition(); |
| } |
| |
| |
| final void unreadByte() { |
| byteStream.unreadByte(); |
| } |
| |
| private static final class ByteArrayStream extends ByteArrayInputStream { |
| |
| ByteArrayStream(final byte[] bytes) { |
| super(bytes); |
| } |
| |
| final int getPosition() { |
| // pos is protected in ByteArrayInputStream |
| return pos; |
| } |
| |
| final void unreadByte() { |
| if (pos > 0) { |
| pos--; |
| } |
| } |
| } |
| } |