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Selenium automates browsers. That's it! What you do with that power is entirely up to you.

There is a newer version: 3.9.1

package org.openqa.selenium.server;

import org.openqa.jetty.util.IO;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

public class ModifiedIO {
  /**
   * Copy Stream in to Stream out until EOF or exception.
   */
  public static long copy(InputStream in, OutputStream out)
      throws IOException {
    return copy(in, out, -1);
  }

  public static long copy(Reader in, Writer out)
      throws IOException {
    return copy(in, out, -1);
  }

  /**
   * Copy Stream in to Stream for byteCount bytes or until EOF or exception.
   * 
   * @return Copied bytes count or -1 if no bytes were read *and* EOF was reached
   */
  public static long copy(InputStream in,
                          OutputStream out,
                          long byteCount)
      throws IOException {
    byte buffer[] = new byte[IO.bufferSize];
    int len;

    long returnVal = 0;

    if (byteCount >= 0) {
      while (byteCount > 0) {
        if (byteCount < IO.bufferSize)
          len = in.read(buffer, 0, (int) byteCount);
        else
          len = in.read(buffer, 0, IO.bufferSize);

        if (len == -1) {
          break;
        }
        returnVal += len;

        byteCount -= len;
        out.write(buffer, 0, len);
      }
    } else {
      while (true) {
        len = in.read(buffer, 0, IO.bufferSize);
        if (len < 0) {
          break;
        }
        returnVal += len;
        out.write(buffer, 0, len);
      }
    }

    return returnVal;
  }

  /**
   * Copy Reader to Writer for byteCount bytes or until EOF or exception.
   */
  public static long copy(Reader in,
                          Writer out,
                          long byteCount)
      throws IOException {
    char buffer[] = new char[IO.bufferSize];
    int len;

    long returnVal = 0;

    if (byteCount >= 0) {
      while (byteCount > 0) {
        if (byteCount < IO.bufferSize)
          len = in.read(buffer, 0, (int) byteCount);
        else
          len = in.read(buffer, 0, IO.bufferSize);

        if (len == -1) {
          break;
        }
        returnVal += len;

        byteCount -= len;
        out.write(buffer, 0, len);
      }
    } else {
      while (true) {
        len = in.read(buffer, 0, IO.bufferSize);
        if (len == -1) {
          break;
        }
        returnVal += len;
        out.write(buffer, 0, len);
      }
    }

    return returnVal;
  }

}