/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.pvm.internal.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.jbpm.api.JbpmException;

public abstract class IoUtil {

  public static final int BUFFERSIZE = 4096;

  public static byte[] readBytes(InputStream inputStream) {
    byte[] bytes = null;
    if (inputStream==null) {
      throw new JbpmException("inputStream is null");
    }
    try {
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
      transfer(inputStream, outputStream);
      bytes = outputStream.toByteArray();
      outputStream.close();
      return bytes;
    } catch (IOException e) {
      throw new JbpmException("couldn't read bytes from inputStream", e);
    }
  }
  
  public static int transfer(InputStream in, OutputStream out) {
    int total = 0;
    byte[] buffer = new byte[BUFFERSIZE];
    try {
      int bytesRead = in.read( buffer );
      while ( bytesRead != -1 ) {
        out.write( buffer, 0, bytesRead );
        total += bytesRead;
        bytesRead = in.read( buffer );
      }
      return total;
    } catch (IOException e) {
      throw new JbpmException("couldn't write bytes to output stream", e);
    }
  }
}