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 */