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json/utf8: fix unescaping of unicode code points (#127)

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Richard Aas 2018-04-06 14:47:16 +02:00 • committed by Alfred E. Heggestad
parent 72e89eeeae
commit 13d9d72e03
2 changed files with 71 additions and 8 deletions
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1
include/re_fmt.h
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@ -144,3 +144,4 @@ void fmt_param_apply(const struct pl *pl, fmt_param_h *ph, void *arg);
/* unicode */
int utf8_encode(struct re_printf *pf, const char *str);
int utf8_decode(struct re_printf *pf, const struct pl *pl);
size_t utf8_byteseq(char u[4], unsigned cp);

78
src/fmt/unicode.c
View file

@ -86,6 +86,7 @@ int utf8_encode(struct re_printf *pf, const char *str)
*/
int utf8_decode(struct re_printf *pf, const struct pl *pl)
{
int uhi = -1;
size_t i;
if (!pf)
@ -101,7 +102,9 @@ int utf8_decode(struct re_printf *pf, const struct pl *pl)
if (ch == '\\') {
uint16_t u = 0;
unsigned u = 0;
char ubuf[4];
size_t ulen;
++i;
@ -147,18 +150,32 @@ int utf8_decode(struct re_printf *pf, const struct pl *pl)
u |= ((uint16_t)ch_hex(pl->p[++i])) << 4;
u |= ((uint16_t)ch_hex(pl->p[++i])) << 0;
if (u > 255) {
ch = u>>8;
err = pf->vph(&ch, 1, pf->arg);
if (err)
return err;
/* UTF-16 surrogate pair */
if (u >= 0xd800 && u <= 0xdbff) {
uhi = (u - 0xd800) * 0x400;
continue;
}
else if (u >= 0xdc00 && u <= 0xdfff) {
if (uhi < 0)
continue;
u = uhi + u - 0xdc00 + 0x10000;
}
ch = u & 0xff;
break;
uhi = -1;
ulen = utf8_byteseq(ubuf, u);
err = pf->vph(ubuf, ulen, pf->arg);
if (err)
return err;
continue;
}
}
uhi = -1;
err = pf->vph(&ch, 1, pf->arg);
if (err)
return err;
@ -166,3 +183,48 @@ int utf8_decode(struct re_printf *pf, const struct pl *pl)
return 0;
}
/**
* Encode Unicode code point into binary UTF-8
*
* @param u Binary UTF-8 buffer
* @param cp Unicode code point
*
* @return length of UTF-8 byte sequence
*/
size_t utf8_byteseq(char u[4], unsigned cp)
{
if (!u)
return 0;
if (cp <= 0x7f) {
u[0] = cp;
return 1;
}
else if (cp <= 0x7ff) {
u[0] = 0xc0 | (cp>>6 & 0x1f);
u[1] = 0x80 | (cp & 0x3f);
return 2;
}
else if (cp <= 0xffff) {
u[0] = 0xe0 | (cp>>12 & 0x0f);
u[1] = 0x80 | (cp>>6 & 0x3f);
u[2] = 0x80 | (cp & 0x3f);
return 3;
}
else if (cp <= 0x10ffff) {
u[0] = 0xf0 | (cp>>18 & 0x07);
u[1] = 0x80 | (cp>>12 & 0x3f);
u[2] = 0x80 | (cp>>6 & 0x3f);
u[3] = 0x80 | (cp & 0x3f);
return 4;
}
else {
/* The replacement character (U+FFFD) */
u[0] = (char)0xef;
u[1] = (char)0xbf;
u[2] = (char)0xbd;
return 3;
}
}