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Diffstat (limited to 'src/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java')
-rw-r--r-- | src/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java b/src/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java new file mode 100644 index 0000000..e0dacd7 --- /dev/null +++ b/src/share/classes/com/sun/org/apache/bcel/internal/util/ByteSequence.java @@ -0,0 +1,85 @@ +/* + * reserved comment block + * DO NOT REMOVE OR ALTER! + */ +package com.sun.org.apache.bcel.internal.util; + +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" and + * "Apache BCEL" must not be used to endorse or promote products + * derived from this software without prior written permission. For + * written permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * "Apache BCEL", nor may "Apache" appear in their name, without + * prior written permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * <http://www.apache.org/>. + */ +import java.io.*; + +/** + * 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. + * + * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> + */ +public final class ByteSequence extends DataInputStream { + private ByteArrayStream byte_stream; + + public ByteSequence(byte[] bytes) { + super(new ByteArrayStream(bytes)); + byte_stream = (ByteArrayStream)in; + } + + public final int getIndex() { return byte_stream.getPosition(); } + final void unreadByte() { byte_stream.unreadByte(); } + + private static final class ByteArrayStream extends ByteArrayInputStream { + ByteArrayStream(byte[] bytes) { super(bytes); } + final int getPosition() { return pos; } // is protected in ByteArrayInputStream + final void unreadByte() { if(pos > 0) pos--; } + } +} |