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• ByteOutputStream.java

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com.sun.xml.messaging.saaj.util.ByteOutputStream Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2016 Oracle and/or its affiliates. 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
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
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 */

package com.sun.xml.messaging.saaj.util;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import java.io.ByteArrayInputStream;

/**
 * Customized {@link BufferedOutputStream}.
 *
 * 

 * Compared to {@link BufferedOutputStream},
 * this class:
 *
 * 

 * 
doesn't do synchronization
 * 
allows access to the raw buffer
 * 
almost no parameter check
 * 
 */
public final class ByteOutputStream extends OutputStream {
    /**
     * The buffer where data is stored.
     */
    protected byte[] buf;

    /**
     * The number of valid bytes in the buffer.
     */
    protected int count = 0;

    public ByteOutputStream() {
        this(1024);
    }

    public ByteOutputStream(int size) {
        buf = new byte[size];
    }

    /**
     * Copies all the bytes from this input into this buffer.
     *
     * @param in input stream.
     * @exception IOException in case of an I/O error.
     */
    public void write(InputStream in) throws IOException {
        if (in instanceof ByteArrayInputStream) {
            int size = in.available();
            ensureCapacity(size);
            count += in.read(buf,count,size);
            return;
        }
        while(true) {
            int cap = buf.length-count;
            int sz = in.read(buf,count,cap);
            if(sz<0)    return;     // hit EOS

            count += sz;
            if(cap==sz)
                // the buffer filled up. double the buffer
                ensureCapacity(count);
        }
    }

    @Override
    public void write(int b) {
        ensureCapacity(1);
        buf[count] = (byte) b;
        count++;
    }

    /**
     * Ensure that the buffer has at least this much space.
     */
    private void ensureCapacity(int space) {
        int newcount = space + count;
        if (newcount > buf.length) {
            byte[] newbuf = new byte[Math.max(buf.length << 1, newcount)];
            System.arraycopy(buf, 0, newbuf, 0, count);
            buf = newbuf;
        }
    }

    @Override
    public void write(byte[] b, int off, int len) {
        ensureCapacity(len);
        System.arraycopy(b, off, buf, count, len);
        count += len;
    }

    @Override
    public void write(byte[] b) {
    	write(b, 0, b.length);
    }

    /**
     * Writes a string as ASCII string.
     *
     * @param s string to write.
     */
    public void writeAsAscii(String s) {
        int len = s.length();

        ensureCapacity(len);

        int ptr = count;
        for( int i=0; i