1 /*
2  * Copyright (C) 2012 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 org.conscrypt;
18 
19 import java.io.FilterInputStream;
20 import java.io.IOException;
21 import java.io.InputStream;
22 
23 /**
24  * Provides an interface to OpenSSL's BIO system directly from a Java
25  * InputStream. It allows an OpenSSL API to read directly from something more
26  * flexible interface than a byte array.
27  *
28  * @hide
29  */
30 @Internal
31 public class OpenSSLBIOInputStream extends FilterInputStream {
32     private long ctx;
33 
OpenSSLBIOInputStream(InputStream is, boolean isFinite)34     public OpenSSLBIOInputStream(InputStream is, boolean isFinite) {
35         super(is);
36 
37         ctx = NativeCrypto.create_BIO_InputStream(this, isFinite);
38     }
39 
getBioContext()40     public long getBioContext() {
41         return ctx;
42     }
43 
release()44     public void release() {
45         NativeCrypto.BIO_free_all(ctx);
46     }
47 
48     /**
49      * Similar to a {@code readLine} method, but matches what OpenSSL expects
50      * from a {@code BIO_gets} method.
51      */
gets(byte[] buffer)52     public int gets(byte[] buffer) throws IOException {
53         if (buffer == null || buffer.length == 0) {
54             return 0;
55         }
56 
57         int offset = 0;
58         int inputByte = 0;
59         while (offset < buffer.length) {
60             inputByte = read();
61             if (inputByte == -1) {
62                 // EOF
63                 break;
64             }
65             if (inputByte == '\n') {
66                 if (offset == 0) {
67                     // If we haven't read anything yet, ignore CRLF.
68                     continue;
69                 } else {
70                     break;
71                 }
72             }
73 
74             buffer[offset++] = (byte) inputByte;
75         }
76 
77         return offset;
78     }
79 }
80