jaxp/src/java.xml/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java
author joehw
Sun, 13 Aug 2017 21:10:40 -0700
changeset 46174 5611d2529b49
parent 44797 8b3b3b911b8a
permissions -rw-r--r--
8163121: BCEL: update to the latest 6.0 release Reviewed-by: dfuchs, lancea
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/*
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 * reserved comment block
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 * DO NOT REMOVE OR ALTER!
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 */
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/*
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements.  See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License.  You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.sun.org.apache.bcel.internal.util;
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import java.io.ByteArrayInputStream;
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import java.io.DataInputStream;
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/**
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 * Utility class that implements a sequence of bytes which can be read
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 * via the `readByte()' method. This is used to implement a wrapper for the
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 * Java byte code stream to gain some more readability.
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 *
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 * @version $Id: ByteSequence.java 1747278 2016-06-07 17:28:43Z britter $
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 */
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public final class ByteSequence extends DataInputStream {
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    private final ByteArrayStream byteStream;
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    public ByteSequence(final byte[] bytes) {
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        super(new ByteArrayStream(bytes));
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        byteStream = (ByteArrayStream) in;
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    }
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    public final int getIndex() {
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        return byteStream.getPosition();
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    }
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    final void unreadByte() {
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        byteStream.unreadByte();
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    }
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    private static final class ByteArrayStream extends ByteArrayInputStream {
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        ByteArrayStream(final byte[] bytes) {
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            super(bytes);
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        }
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        final int getPosition() {
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            // pos is protected in ByteArrayInputStream
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            return pos;
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        }
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        final void unreadByte() {
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            if (pos > 0) {
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                pos--;
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            }
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        }
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    }
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}