idn_result_t
idn__race_decode(idn_converter_t ctx, void *privdata,
const char *from, unsigned long *to, size_t tolen) {
unsigned short *buf = NULL;
size_t prefixlen = strlen(IDN_RACE_PREFIX);
size_t fromlen;
size_t buflen;
idn_result_t r;
assert(ctx != NULL);
TRACE(("idn__race_decode(from=\"%s\", tolen=%d)\n",
idn__debug_xstring(from, 50), (int)tolen));
if (!idn__util_asciihaveaceprefix(from, IDN_RACE_PREFIX)) {
if (*from == '\0') {
r = idn_ucs4_utf8toucs4(from, to, tolen);
goto ret;
}
r = idn_invalid_encoding;
goto ret;
}
from += prefixlen;
fromlen = strlen(from);
/*
* Allocate sufficient buffer.
*/
buflen = fromlen + 1;
buf = malloc(sizeof(*buf) * buflen);
if (buf == NULL) {
r = idn_nomemory;
goto ret;
}
/*
* Decode base32 and decompress.
*/
r = race_decode_decompress(from, buf, buflen);
if (r != idn_success)
goto ret;
/*
* Now 'buf' points the decompressed string, which must contain
* UTF-16 characters.
*/
/*
* Convert to UCS4.
*/
r = idn_ucs4_utf16toucs4(buf, to, tolen);
if (r != idn_success)
goto ret;
ret:
free(buf);
if (r == idn_success) {
TRACE(("idn__race_decode(): succcess (to=\"%s\")\n",
idn__debug_ucs4xstring(to, 50)));
} else {
TRACE(("idn__race_decode(): %s\n", idn_result_tostring(r)));
}
return (r);
}
idn_result_t
idn__punycode_decode(idn_converter_t ctx, void *privdata,
const char *from, unsigned long *to, size_t tolen) {
unsigned long *to_org = to;
unsigned long c, idx;
size_t prefixlen = strlen(IDN_PUNYCODE_PREFIX);
size_t fromlen;
size_t uidx, fidx, ucslen;
int first, bias;
idn_result_t r;
assert(ctx != NULL);
TRACE(("idn__punycode_decode(from=\"%s\", tolen=%d)\n",
idn__debug_xstring(from, 50), (int)tolen));
if (!idn__util_asciihaveaceprefix(from, IDN_PUNYCODE_PREFIX)) {
if (*from == '\0') {
r = idn_ucs4_utf8toucs4(from, to, tolen);
goto ret;
}
r = idn_invalid_encoding;
goto ret;
}
from += prefixlen;
fromlen = strlen(from);
/*
* Find the last delimiter, and copy the characters
* before it verbatim.
*/
ucslen = 0;
for (fidx = fromlen; fidx > 0; fidx--) {
if (from[fidx - 1] == '-') {
if (tolen < fidx) {
r = idn_buffer_overflow;
goto ret;
}
for (uidx = 0; uidx < fidx - 1; uidx++) {
to[uidx] = from[uidx];
}
ucslen = uidx;
break;
}
}
first = 1;
bias = PUNYCODE_INITIAL_BIAS;
c = PUNYCODE_INITIAL_N;
idx = 0;
while (fidx < fromlen) {
int len;
unsigned long delta;
int i;
len = punycode_getwc(from + fidx, fromlen - fidx, bias, &delta);
if (len == 0) {
r = idn_invalid_encoding;
goto ret;
}
fidx += len;
bias = punycode_update_bias(delta, ucslen + 1, first);
first = 0;
idx += delta;
c += idx / (ucslen + 1);
uidx = idx % (ucslen + 1);
/* Insert 'c' at uidx. */
if (tolen-- <= 0) {
r = idn_buffer_overflow;
goto ret;
}
for (i = ucslen; i > uidx; i--)
to[i] = to[i - 1];
to[uidx] = c;
ucslen++;
idx = uidx + 1;
}
/* Terminate with NUL. */
if (tolen <= 0) {
r = idn_buffer_overflow;
goto ret;
}
to[ucslen] = '\0';
r = idn_success;
ret:
if (r == idn_success) {
TRACE(("idn__punycode_decode(): succcess (to=\"%s\")\n",
idn__debug_ucs4xstring(to_org, 50)));
} else {
TRACE(("idn__punycode_decode(): %s\n", idn_result_tostring(r)));
}
return (r);
}
