MFC r1.28:
[dragonfly.git] / libexec / dma / base64.c
blob610aa3c313827d1210b5b883523bec6744045f02
1 /*
2 * Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
33 * $DragonFly: src/libexec/dma/base64.c,v 1.1 2008/02/02 18:20:51 matthias Exp $
36 #include <stdlib.h>
37 #include <string.h>
39 int base64_encode(const void *data, int size, char **str);
41 static char base64_chars[] =
42 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
44 int
45 base64_encode(const void *data, int size, char **str)
47 char *s, *p;
48 int i;
49 int c;
50 const unsigned char *q;
52 p = s = (char *) malloc(size * 4 / 3 + 4);
53 if (p == NULL)
54 return -1;
55 q = (const unsigned char *) data;
56 i = 0;
57 for (i = 0; i < size;) {
58 c = q[i++];
59 c *= 256;
60 if (i < size)
61 c += q[i];
62 i++;
63 c *= 256;
64 if (i < size)
65 c += q[i];
66 i++;
67 p[0] = base64_chars[(c & 0x00fc0000) >> 18];
68 p[1] = base64_chars[(c & 0x0003f000) >> 12];
69 p[2] = base64_chars[(c & 0x00000fc0) >> 6];
70 p[3] = base64_chars[(c & 0x0000003f) >> 0];
71 if (i > size)
72 p[3] = '=';
73 if (i > size + 1)
74 p[2] = '=';
75 p += 4;
77 *p = 0;
78 *str = s;
79 return strlen(s);