masqmail

annotate src/base64/base64.c @ 216:84bf7a6b6ccd

find changesets by author, revision, files, or words in the commit message
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 589c365d90b1
rev   line source
meillo@0 1 /* base64.c, Copyright 2000 (C) Oliver Kurth,
meillo@0 2 *
meillo@0 3 * This program is free software; you can redistribute it and/or modify
meillo@0 4 * it under the terms of the GNU General Public License as published by
meillo@0 5 * the Free Software Foundation; either version 2 of the License, or
meillo@0 6 * (at your option) any later version.
meillo@10 7 *
meillo@0 8 * This program is distributed in the hope that it will be useful,
meillo@0 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 11 * GNU General Public License for more details.
meillo@0 12 *
meillo@0 13 * You should have received a copy of the GNU General Public License
meillo@0 14 * along with this program; if not, write to the Free Software
meillo@0 15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
meillo@0 16 */
meillo@0 17
meillo@0 18 /*
meillo@0 19 send bugs to: kurth@innominate.de
meillo@0 20 */
meillo@0 21
meillo@0 22 /* see also RFC 1341 */
meillo@0 23
meillo@0 24 #include <glib.h>
meillo@0 25 #include <string.h>
meillo@0 26 #include "base64.h"
meillo@0 27
meillo@10 28 gchar*
meillo@10 29 base64_encode(guchar * buf, gint len)
meillo@0 30 {
meillo@10 31 guchar *outbuf, *q;
meillo@10 32 gchar enc[64];
meillo@10 33 gint i = 0, j = 0;
meillo@10 34 guint in0, in1, in2;
meillo@0 35
meillo@10 36 for (; i < 26; i++)
meillo@10 37 enc[i] = (gchar) ('A' + j++);
meillo@10 38 j = 0;
meillo@10 39 for (; i < 52; i++)
meillo@10 40 enc[i] = (gchar) ('a' + j++);
meillo@10 41 j = 0;
meillo@10 42 for (; i < 62; i++)
meillo@10 43 enc[i] = (gchar) ('0' + j++);
meillo@10 44 enc[i++] = '+';
meillo@10 45 enc[i++] = '/';
meillo@0 46
meillo@10 47 outbuf = g_malloc(((len + 3) * 8) / 6);
meillo@10 48 q = outbuf;
meillo@0 49
meillo@10 50 i = 0;
meillo@10 51 while (i < len - 2) {
meillo@10 52 in0 = buf[i++];
meillo@10 53 in1 = buf[i++];
meillo@10 54 in2 = buf[i++];
meillo@0 55
meillo@10 56 *(q++) = enc[(in0 >> 2) & 0x3f];
meillo@10 57 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
meillo@10 58 *(q++) = enc[((in1 << 2) | (in2 >> 6)) & 0x3f];
meillo@10 59 *(q++) = enc[in2 & 0x3f];
meillo@10 60 }
meillo@10 61 if ((len - i) == 1) {
meillo@10 62 in0 = buf[i++];
meillo@10 63 *(q++) = enc[(in0 >> 2) & 0x3f];
meillo@10 64 *(q++) = enc[(in0 << 4) & 0x3f];
meillo@10 65 *(q++) = '=';
meillo@10 66 *(q++) = '=';
meillo@10 67 } else if ((len - i) == 2) {
meillo@10 68 in0 = buf[i++];
meillo@10 69 in1 = buf[i++];
meillo@10 70 *(q++) = enc[(in0 >> 2) & 0x3f];
meillo@10 71 *(q++) = enc[((in0 << 4) | (in1 >> 4)) & 0x3f];
meillo@10 72 *(q++) = enc[(in1 << 2) & 0x3f];
meillo@10 73 *(q++) = '=';
meillo@10 74 }
meillo@10 75 *q = 0;
meillo@0 76
meillo@10 77 return outbuf;
meillo@0 78 }
meillo@0 79
meillo@10 80 gchar *base64_decode(gchar * buf, gint * size)
meillo@10 81 {
meillo@10 82 guchar *p = buf, *q;
meillo@10 83 guint in[4];
meillo@10 84 /* gchar *out = g_malloc(((strlen(buf)+3) * 3) / 4 + 1); */
meillo@10 85 gchar *out = g_malloc((strlen(buf) + 3) + 1);
meillo@10 86
meillo@10 87 q = out;
meillo@10 88 *size = 0;
meillo@10 89
meillo@10 90 *q = 0;
meillo@10 91
meillo@10 92 while (*p) {
meillo@10 93 int i = 0;
meillo@10 94 while (i < 4) {
meillo@10 95 if (!*p)
meillo@10 96 break;
meillo@10 97 if ((*p >= 'A') && (*p <= 'Z'))
meillo@10 98 in[i++] = *p - 'A';
meillo@10 99 else if ((*p >= 'a') && (*p <= 'z'))
meillo@10 100 in[i++] = (*p - 'a') + 26;
meillo@10 101 else if ((*p >= '0') && (*p <= '9'))
meillo@10 102 in[i++] = (*p - '0') + 52;
meillo@10 103 else if (*p == '+')
meillo@10 104 in[i++] = 62;
meillo@10 105 else if (*p == '/')
meillo@10 106 in[i++] = 63;
meillo@10 107 else if (*p == '=') {
meillo@10 108 in[i++] = 0;
meillo@10 109 p++;
meillo@10 110 break;
meillo@10 111 } else if ((*p != '\r') && (*p != '\n')) {
meillo@10 112 p++;
meillo@10 113 break;
meillo@10 114 }
meillo@10 115 p++;
meillo@10 116 }
meillo@10 117 if ((i == 4) || (p[-1] == '=')) {
meillo@10 118 *(q++) = ((in[0] << 2) | (in[1] >> 4));
meillo@10 119 *(q++) = ((in[1] << 4) | (in[2] >> 2));
meillo@10 120 *(q++) = ((in[2] << 6) | in[3]);
meillo@10 121 if (p[-1] == '=') {
meillo@10 122 if (i == 3) {
meillo@10 123 (*size)++;
meillo@10 124 } else if (i == 4) {
meillo@10 125 (*size) += 2;
meillo@10 126 }
meillo@10 127 } else {
meillo@10 128 *size += 3;
meillo@10 129 }
meillo@10 130 }
meillo@10 131 }
meillo@10 132 return out;
meillo@10 133 }