1 /*
   2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.oracle.ipack.util;
  27 
  28 import java.io.File;
  29 import java.io.FileInputStream;
  30 import java.io.IOException;
  31 import java.io.InputStream;
  32 import java.io.OutputStream;
  33 
  34 public final class DataCopier {
  35     private final byte[] buffer;
  36 
  37     public DataCopier() {
  38         buffer = new byte[65536];
  39     }
  40 
  41     public void copyFile(final OutputStream os, final File file)
  42             throws IOException {
  43         final InputStream is = new FileInputStream(file);
  44         try {
  45             copyStream(os, is);
  46         } finally {
  47             try {
  48                 is.close();
  49             } catch (final IOException e) {
  50                 // ignore
  51             }
  52         }
  53     }
  54 
  55     public void copyStream(final OutputStream os, final InputStream is)
  56             throws IOException {
  57         int read;
  58         while ((read = is.read(buffer)) != -1) {
  59             os.write(buffer, 0, read);
  60         }
  61     }
  62 
  63     public void copyStream(final OutputStream os,
  64                            final InputStream is,
  65                            final int limit) throws IOException {
  66         int remaining = limit;
  67         while (remaining > 0) {
  68             final int chunkSize = (remaining < buffer.length)
  69                                           ? remaining
  70                                           : buffer.length;
  71             final int read = is.read(buffer, 0, chunkSize);
  72             if (read == -1) {
  73                 // end of stream
  74                 return;
  75             }
  76 
  77             os.write(buffer, 0, read);
  78             remaining -= read;
  79         }
  80     }
  81 }