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wind: Support UTF-16–encoding non-BMP codepoints

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Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
This commit is contained in:
Joseph Sutton
2023-08-14 14:17:00 +12:00
committed by Nico Williams
parent 821fac3648
commit ba63461cd4
1 changed files with 22 additions and 7 deletions
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29
lib/wind/utf8.c
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@@ -412,15 +412,30 @@ wind_utf8ucs2(const char *in, uint16_t *out, size_t *out_len)
if (ret) if (ret)
return ret; return ret;
if (u & 0xffff0000) if (u >= 0x10000) {
return WIND_ERR_NOT_UTF16; if (out) {
uint16_t high_ten_bits;
uint16_t low_ten_bits;
if (out) { if (o + 2 > *out_len)
if (o >= *out_len) return WIND_ERR_OVERRUN;
return WIND_ERR_OVERRUN;
out[o] = u; u -= 0x10000;
high_ten_bits = (u >> 10) & 0x3ff;
low_ten_bits = u & 0x3ff;
out[o] = 0xd800 | high_ten_bits;
out[o+1] = 0xdc00 | low_ten_bits;
}
o += 2;
} else {
if (out) {
if (o >= *out_len)
return WIND_ERR_OVERRUN;
out[o] = u;
}
o++;
} }
o++;
} }
*out_len = o; *out_len = o;
return 0; return 0;