1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * convert base 64 ascii to long int
32 * char set is [./0-9A-Za-z]
33 *
34 */
35 #include "lint.h"
36 #include <sys/types.h>
37 #include <stdlib.h>
38
39 #define BITSPERCHAR 6 /* to hold entire character set */
40 #define MAXBITS (6 * BITSPERCHAR) /* maximum number */
41 /* of 6 chars converted */
42
43 long
a64l(const char * s)44 a64l(const char *s)
45 {
46 int i, c;
47 int lg = 0;
48
49 for (i = 0; ((c = *s++) != '\0') && (i < MAXBITS); i += BITSPERCHAR) {
50 if (c > 'Z')
51 c -= 'a' - 'Z' - 1;
52 if (c > '9')
53 c -= 'A' - '9' - 1;
54 lg |= (c - ('0' - 2)) << i;
55 }
56 return ((long)lg);
57 }
58