1*e7917716SAndrew Rist /**************************************************************
2cdf0e10cSrcweir *
3*e7917716SAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one
4*e7917716SAndrew Rist * or more contributor license agreements. See the NOTICE file
5*e7917716SAndrew Rist * distributed with this work for additional information
6*e7917716SAndrew Rist * regarding copyright ownership. The ASF licenses this file
7*e7917716SAndrew Rist * to you under the Apache License, Version 2.0 (the
8*e7917716SAndrew Rist * "License"); you may not use this file except in compliance
9*e7917716SAndrew Rist * with the License. You may obtain a copy of the License at
10*e7917716SAndrew Rist *
11*e7917716SAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0
12*e7917716SAndrew Rist *
13*e7917716SAndrew Rist * Unless required by applicable law or agreed to in writing,
14*e7917716SAndrew Rist * software distributed under the License is distributed on an
15*e7917716SAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16*e7917716SAndrew Rist * KIND, either express or implied. See the License for the
17*e7917716SAndrew Rist * specific language governing permissions and limitations
18*e7917716SAndrew Rist * under the License.
19*e7917716SAndrew Rist *
20*e7917716SAndrew Rist *************************************************************/
21*e7917716SAndrew Rist
22*e7917716SAndrew Rist
23cdf0e10cSrcweir
24cdf0e10cSrcweir #include <stdio.h>
25cdf0e10cSrcweir #include <string.h>
26cdf0e10cSrcweir #include "base64.h"
27cdf0e10cSrcweir
28cdf0e10cSrcweir static const char base64_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29cdf0e10cSrcweir
base64_encode(FILE * fin,FILE * fout)30cdf0e10cSrcweir extern "C" size_t base64_encode( FILE *fin, FILE *fout )
31cdf0e10cSrcweir {
32cdf0e10cSrcweir size_t nBytesRead = 0;
33cdf0e10cSrcweir size_t nLineLength = 0;
34cdf0e10cSrcweir size_t nBytesWritten = 0;
35cdf0e10cSrcweir
36cdf0e10cSrcweir size_t nBytes = 0;
37cdf0e10cSrcweir
38cdf0e10cSrcweir do
39cdf0e10cSrcweir {
40cdf0e10cSrcweir unsigned char in_buffer[3];
41cdf0e10cSrcweir
42cdf0e10cSrcweir memset( in_buffer, 0, sizeof(in_buffer) );
43cdf0e10cSrcweir nBytes = fread( in_buffer, 1, sizeof(in_buffer), fin );
44cdf0e10cSrcweir nBytesRead += nBytes;
45cdf0e10cSrcweir
46cdf0e10cSrcweir if ( nBytes )
47cdf0e10cSrcweir {
48cdf0e10cSrcweir unsigned long value =
49cdf0e10cSrcweir ((unsigned long)in_buffer[0]) << 16 |
50cdf0e10cSrcweir ((unsigned long)in_buffer[1]) << 8 |
51cdf0e10cSrcweir ((unsigned long)in_buffer[2]) << 0;
52cdf0e10cSrcweir
53cdf0e10cSrcweir unsigned char out_buffer[4];
54cdf0e10cSrcweir
55cdf0e10cSrcweir memset( out_buffer, '=', sizeof(out_buffer) );
56cdf0e10cSrcweir
57cdf0e10cSrcweir out_buffer[0] = base64_tab[(value >> 18) & 0x3F];
58cdf0e10cSrcweir out_buffer[1] = base64_tab[(value >> 12) & 0x3F];
59cdf0e10cSrcweir
60cdf0e10cSrcweir if ( nBytes > 1 )
61cdf0e10cSrcweir {
62cdf0e10cSrcweir out_buffer[2] = base64_tab[(value >> 6) & 0x3F];
63cdf0e10cSrcweir if ( nBytes > 2 )
64cdf0e10cSrcweir out_buffer[3] = base64_tab[(value >> 0) & 0x3F];
65cdf0e10cSrcweir }
66cdf0e10cSrcweir
67cdf0e10cSrcweir if ( nLineLength >= 76 )
68cdf0e10cSrcweir {
69cdf0e10cSrcweir fputs( "\n", fout );
70cdf0e10cSrcweir nLineLength = 0;
71cdf0e10cSrcweir }
72cdf0e10cSrcweir
73cdf0e10cSrcweir nBytesWritten += fwrite( out_buffer, 1, sizeof(out_buffer), fout );
74cdf0e10cSrcweir nLineLength += sizeof(out_buffer);
75cdf0e10cSrcweir }
76cdf0e10cSrcweir } while ( nBytes );
77cdf0e10cSrcweir
78cdf0e10cSrcweir return nBytesWritten;
79cdf0e10cSrcweir }
80