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/* 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, j; /* 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 (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
*/
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