2 * Copyright (C) 2000 Edmund Grimley Evans <edmundo@rano.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 #include "imap_private.h"
23 static int Index_64[128] = {
24 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
25 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
26 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, 63,-1,-1,-1,
27 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
28 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
29 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
30 -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
31 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
34 static char B64Chars[64] = {
35 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
36 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
37 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
38 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
43 * Convert the data (u7,u7len) from RFC 2060's UTF-7 to UTF-8.
44 * The result is null-terminated and returned, and also stored
45 * in (*u8,*u8len) if u8 or u8len is non-zero.
46 * If input data is invalid, return 0 and don't store anything.
47 * RFC 2060 obviously intends the encoding to be unique (see
48 * point 5 in section 5.1.3), so we reject any non-canonical
49 * form, such as &ACY- (instead of &-) or &AMA-&AMA- (instead
52 static char *utf7_to_utf8 (const char *u7, size_t u7len, char **u8,
58 p = buf = safe_malloc (u7len + u7len / 8 + 1);
60 for (; u7len; u7++, u7len--)
66 if (u7len && *u7 == '-')
74 for (; u7len; u7++, u7len--)
76 if ((*u7 & 0x80) || (b = Index_64[(int)*u7]) == -1)
88 if (0x20 <= ch && ch < 0x7f)
89 /* Printable US-ASCII */
95 *p++ = 0xc0 | (ch >> 6);
96 *p++ = 0x80 | (ch & 0x3f);
100 *p++ = 0xe0 | (ch >> 12);
101 *p++ = 0x80 | ((ch >> 6) & 0x3f);
102 *p++ = 0x80 | (ch & 0x3f);
104 ch = (b << (16 + k)) & 0xffff;
109 /* Non-zero or too many extra bits */
111 if (!u7len || *u7 != '-')
112 /* BASE64 not properly terminated */
114 if (u7len > 2 && u7[1] == '&' && u7[2] != '-')
115 /* Adjacent BASE64 sections */
118 else if (*u7 < 0x20 || *u7 >= 0x7f)
119 /* Not printable US-ASCII */
128 safe_realloc (&buf, p - buf);
139 * Convert the data (u8,u8len) from UTF-8 to RFC 2060's UTF-7.
140 * The result is null-terminated and returned, and also stored
141 * in (*u7,*u7len) if u7 or u7len is non-zero.
142 * Unicode characters above U+FFFF are replaced by U+FFFE.
143 * If input data is invalid, return 0 and don't store anything.
145 static char *utf8_to_utf7 (const char *u8, size_t u8len, char **u7,
150 int n, i, b = 0, k = 0;
154 * In the worst case we convert 2 chars to 7 chars. For example:
155 * "\x10&\x10&..." -> "&ABA-&-&ABA-&-...".
157 p = buf = safe_malloc ((u8len / 2) * 7 + 6);
161 unsigned char c = *u8;
168 ch = c & 0x1f, n = 1;
170 ch = c & 0x0f, n = 2;
172 ch = c & 0x07, n = 3;
174 ch = c & 0x03, n = 4;
176 ch = c & 0x01, n = 5;
183 for (i = 0; i < n; i++)
185 if ((u8[i] & 0xc0) != 0x80)
187 ch = (ch << 6) | (u8[i] & 0x3f);
189 if (n > 1 && !(ch >> (n * 5 + 1)))
193 if (ch < 0x20 || ch >= 0x7f)
204 *p++ = B64Chars[b | ch >> k];
206 for (; k >= 0; k -= 6)
207 *p++ = B64Chars[(ch >> k) & 0x3f];
208 b = (ch << (-k)) & 0x3f;
242 safe_realloc (&buf, p - buf);
251 void imap_utf7_encode (char **s)
255 char *t = safe_strdup (*s);
256 if (!mutt_convert_string (&t, Charset, "UTF-8", 0))
257 utf8_to_utf7 (t, strlen (t), s, 0);
262 void imap_utf7_decode (char **s)
266 char *t = utf7_to_utf8 (*s, strlen (*s), 0, 0);
267 if (t && !mutt_convert_string (&t, "UTF-8", Charset, 0))