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
17package org.conscrypt;
18
19import java.io.FilterInputStream;
20import java.io.IOException;
21import 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
31public class OpenSSLBIOInputStream extends FilterInputStream {
32    private long ctx;
33
34    public OpenSSLBIOInputStream(InputStream is, boolean isFinite) {
35        super(is);
36
37        ctx = NativeCrypto.create_BIO_InputStream(this, isFinite);
38    }
39
40    public long getBioContext() {
41        return ctx;
42    }
43
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     */
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