1 /*
2  * Copyright (C) 2014 The Android Open Source Project
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 com.android.emailcommon.mail;
18 
19 import android.util.Base64;
20 import android.util.Base64OutputStream;
21 
22 import org.apache.commons.io.IOUtils;
23 
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.io.OutputStream;
27 
28 public class Base64Body implements Body {
29     private final InputStream mSource;
30     // Because we consume the input stream, we can only write out once
31     private boolean mAlreadyWritten;
32 
Base64Body(InputStream source)33     public Base64Body(InputStream source) {
34         mSource = source;
35     }
36 
37     @Override
getInputStream()38     public InputStream getInputStream() throws MessagingException {
39         return mSource;
40     }
41 
42     /**
43      * This method consumes the input stream, so can only be called once
44      * @param out Stream to write to
45      * @throws IllegalStateException If called more than once
46      * @throws IOException
47      * @throws MessagingException
48      */
49     @Override
writeTo(OutputStream out)50     public void writeTo(OutputStream out)
51             throws IllegalStateException, IOException, MessagingException {
52         if (mAlreadyWritten) {
53             throw new IllegalStateException("Base64Body can only be written once");
54         }
55         mAlreadyWritten = true;
56         try {
57             final Base64OutputStream b64out = new Base64OutputStream(out, Base64.DEFAULT);
58             IOUtils.copyLarge(mSource, b64out);
59         } finally {
60             mSource.close();
61         }
62     }
63 }
64