com.sun.grizzly.lzma.compression.lz.OutWindow Maven / Gradle / Ivy

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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2007-2010 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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package com.sun.grizzly.lzma.compression.lz;

import java.io.IOException;

/**
 * OutWindow
 *
 * @author Igor Pavlov
 */
public class OutWindow {

    byte[] _buffer;
    int _pos;
    int _windowSize = 0;
    int _streamPos;
    java.io.OutputStream _stream;

    public void Create(int windowSize) {
        if (_buffer == null || _windowSize != windowSize) {
            _buffer = new byte[windowSize];
        }
        _windowSize = windowSize;
        _pos = 0;
        _streamPos = 0;
    }

    public void SetStream(java.io.OutputStream stream) throws IOException {
        ReleaseStream();
        _stream = stream;
    }

    public void ReleaseStream() throws IOException {
        Flush();
        _stream = null;
    }

    public void Init(boolean solid) {
        if (!solid) {
            _streamPos = 0;
            _pos = 0;
        }
    }

    public void Flush() throws IOException {
        int size = _pos - _streamPos;
        if (size == 0) {
            return;
        }
        _stream.write(_buffer, _streamPos, size);
        if (_pos >= _windowSize) {
            _pos = 0;
        }
        _streamPos = _pos;
    }

    public void CopyBlock(int distance, int len) throws IOException {
        int pos = _pos - distance - 1;
        if (pos < 0) {
            pos += _windowSize;
        }
        for (; len != 0; len--) {
            if (pos >= _windowSize) {
                pos = 0;
            }
            _buffer[_pos++] = _buffer[pos++];
            if (_pos >= _windowSize) {
                Flush();
            }
        }
    }

    public void PutByte(byte b) throws IOException {
        _buffer[_pos++] = b;
        if (_pos >= _windowSize) {
            Flush();
        }
    }

    public byte GetByte(int distance) {
        int pos = _pos - distance - 1;
        if (pos < 0) {
            pos += _windowSize;
        }
        return _buffer[pos];
    }
}