1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
#include "exim.h"
#ifdef SUPPORT_I18N
uschar *
imap_utf7_encode(uschar *string, const uschar *charset, uschar sep,
uschar *specials, uschar **error)
{
static uschar encode_base64[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
size_t slen;
uschar *sptr;
gstring * yield = NULL;
int i = 0; /* compiler quietening */
uschar c = 0; /* compiler quietening */
BOOL base64mode = FALSE;
BOOL lastsep = FALSE;
uschar utf16buf[256];
uschar *utf16ptr;
uschar *s;
uschar outbuf[256];
uschar *outptr = outbuf;
#if HAVE_ICONV
iconv_t icd;
#endif
if (!specials) specials = US"";
/* Pass over the string. If it consists entirely of "normal" characters
(possibly with leading seps), return it as is. */
for (s = string; *s; s++)
{
if (s == string && *s == sep)
string++;
if ( *s >= 0x7f
|| *s < 0x20
|| strchr("./&", *s)
|| *s == sep
|| Ustrchr(specials, *s)
)
break;
}
if (!*s)
return string;
sptr = string;
slen = Ustrlen(string);
#if HAVE_ICONV
if ((icd = iconv_open("UTF-16BE", CCS charset)) == (iconv_t)-1)
{
*error = string_sprintf(
"imapfolder: iconv_open(\"UTF-16BE\", \"%s\") failed: %s%s",
charset, strerror(errno),
errno == EINVAL ? " (maybe unsupported conversion)" : "");
return NULL;
}
#endif
while (slen > 0)
{
#if HAVE_ICONV
size_t left = sizeof(utf16buf);
utf16ptr = utf16buf;
if ( iconv(icd, (ICONV_ARG2_TYPE)&sptr, &slen, CSS &utf16ptr, &left)
== (size_t)-1
&& errno != E2BIG
)
{
*error = string_sprintf("imapfolder: iconv() failed to convert from %s: %s",
charset, strerror(errno));
iconv_close(icd);
return NULL;
}
#else
for (utf16ptr = utf16buf;
slen > 0 && (utf16ptr - utf16buf) < sizeof(utf16buf);
utf16ptr += 2, slen--, sptr++)
{
*utf16ptr = *sptr;
*(utf16ptr+1) = '\0';
}
#endif
s = utf16buf;
while (s < utf16ptr)
{
/* Now encode utf16buf as modified UTF-7 */
if ( s[0] != 0
|| s[1] >= 0x7f
|| s[1] < 0x20
|| (Ustrchr(specials, s[1]) && s[1] != sep)
)
{
lastsep = FALSE;
/* Encode as modified BASE64 */
if (!base64mode)
{
*outptr++ = '&';
base64mode = TRUE;
i = 0;
}
for (int j = 0; j < 2; j++, s++) switch (i++)
{
case 0:
/* Top 6 bits of the first octet */
*outptr++ = encode_base64[(*s >> 2) & 0x3F];
c = (*s & 0x03); break;
case 1:
/* Bottom 2 bits of the first octet, and top 4 bits of the second */
*outptr++ = encode_base64[(c << 4) | ((*s >> 4) & 0x0F)];
c = (*s & 0x0F); break;
case 2:
/* Bottom 4 bits of the second octet and top 2 bits of the third */
*outptr++ = encode_base64[(c << 2) | ((*s >> 6) & 0x03)];
/* Bottom 6 bits of the third octet */
*outptr++ = encode_base64[*s & 0x3F];
i = 0;
}
}
else if ( (s[1] != '.' && s[1] != '/')
|| s[1] == sep
)
{
/* Encode as self (almost) */
if (base64mode)
{
switch (i)
{
case 1:
/* Remaining bottom 2 bits of the last octet */
*outptr++ = encode_base64[c << 4];
break;
case 2:
/* Remaining bottom 4 bits of the last octet */
*outptr++ = encode_base64[c << 2];
}
*outptr++ = '-';
base64mode = FALSE;
}
if (*++s == sep)
{
if (!lastsep)
{
*outptr++ = '.';
lastsep = TRUE;
}
}
else
{
*outptr++ = *s;
if (*s == '&')
*outptr++ = '-';
lastsep = FALSE;
}
s++;
}
else
{
*error = string_sprintf("imapfolder: illegal character '%c'", s[1]);
return NULL;
}
if (outptr > outbuf + sizeof(outbuf) - 3)
{
yield = string_catn(yield, outbuf, outptr - outbuf);
outptr = outbuf;
}
}
} /* End of input string */
if (base64mode)
{
switch (i)
{
case 1:
/* Remaining bottom 2 bits of the last octet */
*outptr++ = encode_base64[c << 4];
break;
case 2:
/* Remaining bottom 4 bits of the last octet */
*outptr++ = encode_base64[c << 2];
}
*outptr++ = '-';
}
#if HAVE_ICONV
iconv_close(icd);
#endif
yield = string_catn(yield, outbuf, outptr - outbuf);
if (yield->s[yield->ptr-1] == '.')
yield->ptr--;
return string_from_gstring(yield);
}
#endif /* whole file */
/* vi: aw ai sw=2
*/
|
