2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2011 Hiroyuki Yamamoto and the Claws Mail team
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 3 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, see <http://www.gnu.org/licenses/>.
27 static const gchar base64char[64] =
28 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
30 static const signed char base64val[128] = {
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, -1, -1, -1, -1, -1,
33 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
34 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
35 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
36 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
37 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
38 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
41 #define BASE64VAL(c) (IS_ASCII(c) ? base64val[(gint) (c)] : -1)
43 void base64_encode(gchar *out, const guchar *in, gint inlen)
45 const guchar *inp = in;
49 *outp++ = base64char[(inp[0] >> 2) & 0x3f];
50 *outp++ = base64char[((inp[0] & 0x03) << 4) |
51 ((inp[1] >> 4) & 0x0f)];
52 *outp++ = base64char[((inp[1] & 0x0f) << 2) |
53 ((inp[2] >> 6) & 0x03)];
54 *outp++ = base64char[inp[2] & 0x3f];
61 *outp++ = base64char[(inp[0] >> 2) & 0x3f];
63 *outp++ = base64char[(inp[0] & 0x03) << 4];
66 *outp++ = base64char[((inp[0] & 0x03) << 4) |
67 ((inp[1] >> 4) & 0x0f)];
68 *outp++ = base64char[((inp[1] & 0x0f) << 2)];
76 gint base64_decode(guchar *out, const gchar *in, gint inlen)
78 const gchar *inp = in;
85 while (inlen >= 4 && *inp != '\0') {
88 if (BASE64VAL(buf[0]) == -1) break;
92 if (BASE64VAL(buf[1]) == -1) break;
96 if (buf[2] != '=' && BASE64VAL(buf[2]) == -1) break;
100 if (buf[3] != '=' && BASE64VAL(buf[3]) == -1) break;
102 *outp++ = ((BASE64VAL(buf[0]) << 2) & 0xfc) |
103 ((BASE64VAL(buf[1]) >> 4) & 0x03);
105 *outp++ = ((BASE64VAL(buf[1]) & 0x0f) << 4) |
106 ((BASE64VAL(buf[2]) >> 2) & 0x0f);
108 *outp++ = ((BASE64VAL(buf[2]) & 0x03) << 6) |
109 (BASE64VAL(buf[3]) & 0x3f);
117 Base64Decoder *base64_decoder_new(void)
119 Base64Decoder *decoder;
121 decoder = g_new0(Base64Decoder, 1);
125 void base64_decoder_free(Base64Decoder *decoder)
130 gint base64_decoder_decode(Base64Decoder *decoder,
131 const gchar *in, guchar *out, gint inlen)
133 const gchar *in_end = in + inlen;
134 gint len, total_len = 0;
135 gboolean in_more = inlen > 0;
136 gboolean got_eq = FALSE;
140 cm_return_val_if_fail(decoder != NULL, -1);
141 cm_return_val_if_fail(in != NULL, -1);
142 cm_return_val_if_fail(out != NULL, -1);
144 /* Start with previous saved tail */
145 buf_len = decoder->buf_len;
146 memcpy(buf, decoder->buf, sizeof(buf));
149 while (buf_len < 4 && in_more) {
154 if (got_eq || BASE64VAL(c) >= 0)
156 in_more = (in < in_end) && !(got_eq && (buf_len == 4));
159 len = base64_decode(out, buf, 4);
166 /* Save tail for next iteration call. It wll be ignored if ends here. */
167 decoder->buf_len = buf_len;
168 memcpy(decoder->buf, buf, buf_len);