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SubEtha SMTP is an easy-to-use server-side SMTP library for Java.

There is a newer version: 3.1.7

package org.subethamail.smtp.io;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

/**
 * Adds a getInputStream() method which does not need
 * to make a copy of the underlying array.
 */
class BetterByteArrayOutputStream extends ByteArrayOutputStream
{
	/** */
	public BetterByteArrayOutputStream()
	{
	}

	/** */
	public BetterByteArrayOutputStream(int size)
	{
		super(size);
	}

	/**
	 * Does not make a copy of the internal buffer.
	 */
	public InputStream getInputStream()
	{
		return new ByteArrayInputStream(this.buf, 0, this.count);
	}
}