Fast Byte Array OutputStream : Byte Array « File Input Output « Java

Fast Byte Array OutputStream

//package web.sopo.util;


public class FastByteArrayOutputStream extends OutputStream {
     * Buffer and size
    protected byte[] buf = null;
    protected int size = 0;

     * Constructs a stream with buffer capacity size 5K
    public FastByteArrayOutputStream() {
        this(5 * 1024);

     * Constructs a stream with the given initial size
    public FastByteArrayOutputStream(int initSize) {
        this.size = 0;
        this.buf = new byte[initSize];

     * Ensures that we have a large enough buffer for the given size.
    private void verifyBufferSize(int sz) {
        if (sz > buf.length) {
            byte[] old = buf;
            buf = new byte[Math.max(sz, 2 * buf.length )];
            System.arraycopy(old, 0, buf, 0, old.length);
            old = null;

    public int getSize() {
        return size;

     * Returns the byte array containing the written data. Note that this
     * array will almost always be larger than the amount of data actually
     * written.
    public byte[] getByteArray() {
        return buf;

    public final void write(byte b[]) {
        verifyBufferSize(size + b.length);
        System.arraycopy(b, 0, buf, size, b.length);
        size += b.length;

    public final void write(byte b[], int off, int len) {
        verifyBufferSize(size + len);
        System.arraycopy(b, off, buf, size, len);
        size += len;

    public final void write(int b) {
        verifyBufferSize(size + 1);
        buf[size++] = (byte) b;

    public void reset() {
        size = 0;



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