2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2002 Hiroyuki Yamamoto
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 static const gchar base64char[64] =
27 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29 static const gchar base64val[128] = {
30 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
32 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
33 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
34 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
35 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
36 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
37 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
40 #define BASE64VAL(c) (isascii(c) ? base64val[(gint)(c)] : -1)
42 void base64_encode(gchar *out, const guchar *in, gint inlen)
44 const guchar *inp = in;
48 *outp++ = base64char[(inp[0] >> 2) & 0x3f];
49 *outp++ = base64char[((inp[0] & 0x03) << 4) |
50 ((inp[1] >> 4) & 0x0f)];
51 *outp++ = base64char[((inp[1] & 0x0f) << 2) |
52 ((inp[2] >> 6) & 0x03)];
53 *outp++ = base64char[inp[2] & 0x3f];
60 *outp++ = base64char[(inp[0] >> 2) & 0x3f];
62 *outp++ = base64char[(inp[0] & 0x03) << 4];
65 *outp++ = base64char[((inp[0] & 0x03) << 4) |
66 ((inp[1] >> 4) & 0x0f)];
67 *outp++ = base64char[((inp[1] & 0x0f) << 2)];
75 gint base64_decode(guchar *out, const gchar *in, gint inlen)
77 const gchar *inp = in;
84 while (inlen >= 4 && *inp != '\0') {
87 if (BASE64VAL(buf[0]) == -1) break;
91 if (BASE64VAL(buf[1]) == -1) break;
95 if (buf[2] != '=' && BASE64VAL(buf[2]) == -1) break;
99 if (buf[3] != '=' && BASE64VAL(buf[3]) == -1) break;
101 *outp++ = ((BASE64VAL(buf[0]) << 2) & 0xfc) |
102 ((BASE64VAL(buf[1]) >> 4) & 0x03);
104 *outp++ = ((BASE64VAL(buf[1]) & 0x0f) << 4) |
105 ((BASE64VAL(buf[2]) >> 2) & 0x0f);
107 *outp++ = ((BASE64VAL(buf[2]) & 0x03) << 6) |
108 (BASE64VAL(buf[3]) & 0x3f);
116 Base64Decoder *base64_decoder_new(void)
118 Base64Decoder *decoder;
120 decoder = g_new0(Base64Decoder, 1);
124 void base64_decoder_free(Base64Decoder *decoder)
129 gint base64_decoder_decode(Base64Decoder *decoder,
130 const gchar *in, guchar *out)
132 gint len, total_len = 0;
136 g_return_val_if_fail(decoder != NULL, -1);
137 g_return_val_if_fail(in != NULL, -1);
138 g_return_val_if_fail(out != NULL, -1);
140 buf_len = decoder->buf_len;
141 memcpy(buf, decoder->buf, sizeof(buf));
144 while (buf_len < 4) {
148 if (c == '\0') break;
149 if (c == '\r' || c == '\n') continue;
150 if (c != '=' && BASE64VAL(c) == -1)
154 if (buf_len < 4 || buf[0] == '=' || buf[1] == '=') {
155 decoder->buf_len = buf_len;
156 memcpy(decoder->buf, buf, sizeof(buf));
159 len = base64_decode(out, buf, 4);
164 decoder->buf_len = 0;