IOUtils


1   /*
2    * Copyright 2001-2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.jboss.axis.utils;
18  
19  import java.io.ByteArrayOutputStream  ;
20  import java.io.IOException  ;
21  import java.io.InputStream  ;
22  
23  public class IOUtils
24  {
25     /**
26      * Helper method, just calls <tt>readFully(in, b, 0, b.length)</tt>
27      */
28     public static int readFully(InputStream   in, byte[] b)
29             throws IOException  
30     {
31        return readFully(in, b, 0, b.length);
32     }
33  
34     /**
35      * Same as the normal <tt>in.read(b, off, len)</tt>, but tries to ensure that
36      * <p/>
37      * the entire len number of bytes is read.
38      * <p/>
39      * <p/>
40      * <p/>
41      * If the end of file is reached before any bytes are read, returns -1.
42      * <p/>
43      * Otherwise, returns the number of bytes read.
44      */
45     public static int readFully(InputStream   in, byte[] b, int off, int len)
46             throws IOException  
47     {
48        int total = 0;
49        for (; ;)
50        {
51           int got = in.read(b, off + total, len - total);
52           if (got < 0)
53           {
54              return (total == 0) ? -1 : total;
55           }
56           else
57           {
58              total += got;
59              if (total == len)
60                 return total;
61           }
62        }
63     }
64  
65     /** Copy the content of the given input stream to a byte array.
66      */
67     public static byte[] toByteArray(InputStream   is)
68             throws IOException  
69     {
70        ByteArrayOutputStream   baos = new ByteArrayOutputStream  (1024);
71        byte[] bytes = new byte[1024];
72        int read = is.read(bytes);
73        while (read > 0)
74        {
75           baos.write(bytes, 0, read);
76           read = is.read(bytes);
77        }
78        bytes = baos.toByteArray();
79        return bytes;
80     }
81  }
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