masqmail-0.2

view src/base64/base64.c @ 170:0f0e4e7cd762

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added misc/list-versions This script helps to check if the versions numbers in the project are the same as the one for the release. This script is motivated by the 0.2.27 release in which masqmail introduces itself as being version 0.2.26.
author meillo@marmaro.de
date Mon, 19 Jul 2010 14:01:13 +0200
parents 08114f7dcc23
children 805abb75b20c
line source
1 /* base64.c, Copyright 2000 (C) Oliver Kurth,
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 */
17
18 /*
19 send bugs to: kurth@innominate.de
20 */
21
22 /* see also RFC 1341 */
23
24 #include <glib.h>
25 #include <string.h>
26 #include "base64.h"
27
28 gchar*
29 base64_encode(guchar * buf, gint len)
30 {
31 guchar *outbuf, *q;
32 gchar enc[64];
33 gint i = 0, j = 0;
34 guint in0, in1, in2;
35
36 for (; i < 26; i++)
37 enc[i] = (gchar) ('A' + j++);
38 j = 0;
39 for (; i < 52; i++)
40 enc[i] = (gchar) ('a' + j++);
41 j = 0;
42 for (; i < 62; i++)
43 enc[i] = (gchar) ('0' + j++);
44 enc[i++] = '+';
45 enc[i++] = '/';
46
47 outbuf = g_malloc(((len + 3) * 8) / 6);
48 q = outbuf;
49
50 i = 0;
51 while (i < len - 2) {
52 in0 = buf[i++];
53 in1 = buf[i++];
54 in2 = buf[i++];
55
56 *(q++) = enc[(in0 >> 2) & 0x3f];
57 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
58 *(q++) = enc[((in1 << 2) | (in2 >> 6)) & 0x3f];
59 *(q++) = enc[in2 & 0x3f];
60 }
61 if ((len - i) == 1) {
62 in0 = buf[i++];
63 *(q++) = enc[(in0 >> 2) & 0x3f];
64 *(q++) = enc[(in0 << 4) & 0x3f];
65 *(q++) = '=';
66 *(q++) = '=';
67 } else if ((len - i) == 2) {
68 in0 = buf[i++];
69 in1 = buf[i++];
70 *(q++) = enc[(in0 >> 2) & 0x3f];
71 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
72 *(q++) = enc[(in1 << 2) & 0x3f];
73 *(q++) = '=';
74 }
75 *q = 0;
76
77 return outbuf;
78 }
79
80 gchar *base64_decode(gchar * buf, gint * size)
81 {
82 guchar *p = buf, *q;
83 guint in[4];
84 /* gchar *out = g_malloc(((strlen(buf)+3) * 3) / 4 + 1); */
85 gchar *out = g_malloc((strlen(buf) + 3) + 1);
86
87 q = out;
88 *size = 0;
89
90 *q = 0;
91
92 while (*p) {
93 int i = 0;
94 while (i < 4) {
95 if (!*p)
96 break;
97 if ((*p >= 'A') && (*p <= 'Z'))
98 in[i++] = *p - 'A';
99 else if ((*p >= 'a') && (*p <= 'z'))
100 in[i++] = (*p - 'a') + 26;
101 else if ((*p >= '0') && (*p <= '9'))
102 in[i++] = (*p - '0') + 52;
103 else if (*p == '+')
104 in[i++] = 62;
105 else if (*p == '/')
106 in[i++] = 63;
107 else if (*p == '=') {
108 in[i++] = 0;
109 p++;
110 break;
111 } else if ((*p != '\r') && (*p != '\n')) {
112 p++;
113 break;
114 }
115 p++;
116 }
117 if ((i == 4) || (p[-1] == '=')) {
118 *(q++) = ((in[0] << 2) | (in[1] >> 4));
119 *(q++) = ((in[1] << 4) | (in[2] >> 2));
120 *(q++) = ((in[2] << 6) | in[3]);
121 if (p[-1] == '=') {
122 if (i == 3) {
123 (*size)++;
124 } else if (i == 4) {
125 (*size) += 2;
126 }
127 } else {
128 *size += 3;
129 }
130 }
131 }
132 return out;
133 }