1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Jeremy Harris 2015 */
6 /* See the file NOTICE for conditions of use and distribution. */
11 #ifdef EXPERIMENTAL_INTERNATIONAL
15 #include <stringprep.h>
18 string_is_utf8(const uschar
* s
)
21 while ((c
= *s
++)) if (c
& 0x80) return TRUE
;
25 /**************************************************/
26 /* Domain conversions */
29 string_domain_utf8_to_alabel(const uschar
* utf8
, uschar
** err
)
35 s
= US
stringprep_utf8_nfkc_normalize(CCS utf8
, -1);
36 if ( (rc
= idna_to_ascii_8z(CCS s
, CSS
&s1
, IDNA_USE_STD3_ASCII_RULES
))
40 if (err
) *err
= US
idna_strerror(rc
);
52 string_domain_alabel_to_utf8(const uschar
* alabel
, uschar
** err
)
57 if ( (rc
= idna_to_unicode_8z8z(CCS alabel
, CSS
&s1
, IDNA_USE_STD3_ASCII_RULES
))
60 if (err
) *err
= US
idna_strerror(rc
);
68 /**************************************************/
69 /* localpart conversions */
73 string_localpart_utf8_to_alabel(const uschar
* utf8
, uschar
** err
)
76 punycode_uint
* p
= (punycode_uint
*) stringprep_utf8_to_ucs4(CCS utf8
, -1, &ucs4_len
);
77 size_t p_len
= ucs4_len
*4; /* this multiplier is pure guesswork */
78 uschar
* res
= store_get(p_len
+5);
81 res
[0] = 'x'; res
[1] = 'n'; res
[2] = res
[3] = '-';
83 if ((rc
= punycode_encode(ucs4_len
, p
, NULL
, &p_len
, res
+4)) != PUNYCODE_SUCCESS
)
86 if (err
) *err
= US
punycode_strerror(rc
);
96 string_localpart_alabel_to_utf8(const uschar
* alabel
, uschar
** err
)
98 size_t p_len
= strlen(alabel
);
102 if (alabel
[0] != 'x' || alabel
[1] != 'n' || alabel
[2] != '-' || alabel
[3] != '-')
104 if (err
) *err
= US
"bad alabel prefix";
109 p
= (punycode_uint
*) store_get((p_len
+1) * sizeof(*p
));
111 if ((rc
= punycode_decode(p_len
, CCS alabel
+4, &p_len
, p
, NULL
)) != PUNYCODE_SUCCESS
)
113 if (err
) *err
= US
punycode_strerror(rc
);
121 #endif /* whole file */