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package org.zeroturnaround.javarebel.integration.util;

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

/**
 * I/O helper methods. 
 * 
 * @author Rein Raudjärv
 */
public class IoUtil {

  private static final int BUFFER_SIZE = 4096;
  
  public static byte[] getBytesAndClose(InputStream in) throws IOException {
    if (in == null)
      return null;
    
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    copy(in, out);
    return out.toByteArray();
  }
  
  public static void write(byte[] bytes, OutputStream out) throws IOException {
    copy(new ByteArrayInputStream(bytes), out);
  }

  private static void copy(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[BUFFER_SIZE];
    int read;

    while ((read = in.read(buffer)) != -1) {
      out.write(buffer, 0, read);
    }
  }
  
}