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-rw-r--r--src/shared/json.c81
1 files changed, 59 insertions, 22 deletions
diff --git a/src/shared/json.c b/src/shared/json.c
index 47f801c858..bb3d26f0e5 100644
--- a/src/shared/json.c
+++ b/src/shared/json.c
@@ -53,6 +53,42 @@ static void inc_lines(unsigned *line, const char *s, size_t n) {
}
}
+static int unhex_ucs2(const char *c, uint16_t *ret) {
+ int aa, bb, cc, dd;
+ uint16_t x;
+
+ assert(c);
+ assert(ret);
+
+ aa = unhexchar(c[0]);
+ if (aa < 0)
+ return -EINVAL;
+
+ bb = unhexchar(c[1]);
+ if (bb < 0)
+ return -EINVAL;
+
+ cc = unhexchar(c[2]);
+ if (cc < 0)
+ return -EINVAL;
+
+ dd = unhexchar(c[3]);
+ if (dd < 0)
+ return -EINVAL;
+
+ x = ((uint16_t) aa << 12) |
+ ((uint16_t) bb << 8) |
+ ((uint16_t) cc << 4) |
+ ((uint16_t) dd);
+
+ if (x <= 0)
+ return -EINVAL;
+
+ *ret = x;
+
+ return 0;
+}
+
static int json_parse_string(const char **p, char **ret) {
_cleanup_free_ char *s = NULL;
size_t n = 0, allocated = 0;
@@ -119,39 +155,40 @@ static int json_parse_string(const char **p, char **ret) {
else if (*c == 't')
ch = '\t';
else if (*c == 'u') {
- int aa, bb, cc, dd;
uint16_t x;
+ int r;
- aa = unhexchar(c[1]);
- if (aa < 0)
- return -EINVAL;
+ r = unhex_ucs2(c + 1, &x);
+ if (r < 0)
+ return r;
- bb = unhexchar(c[2]);
- if (bb < 0)
- return -EINVAL;
+ c += 5;
- cc = unhexchar(c[3]);
- if (cc < 0)
- return -EINVAL;
+ if (!GREEDY_REALLOC(s, allocated, n + 4))
+ return -ENOMEM;
- dd = unhexchar(c[4]);
- if (dd < 0)
+ if (!utf16_is_surrogate(x))
+ n += utf8_encode_unichar(s + n, x);
+ else if (utf16_is_trailing_surrogate(x))
return -EINVAL;
+ else {
+ uint16_t y;
+ if (c[0] != '\\' || c[1] != 'u')
+ return -EINVAL;
- x = ((uint16_t) aa << 12) |
- ((uint16_t) bb << 8) |
- ((uint16_t) cc << 4) |
- ((uint16_t) dd);
+ r = unhex_ucs2(c + 2, &y);
+ if (r < 0)
+ return r;
- if (x <= 0)
- return -EINVAL;
+ c += 6;
- if (!GREEDY_REALLOC(s, allocated, n + 4))
- return -ENOMEM;
+ if (!utf16_is_trailing_surrogate(y))
+ return -EINVAL;
+
+ n += utf8_encode_unichar(s + n, utf16_surrogate_pair_to_unichar(x, y));
+ }
- n += utf8_encode_unichar(s + n, x);
- c += 5;
continue;
} else
return -EINVAL;