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json-core: use table to classify chars for number check

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This commit is contained in:
Wim Taymans 2026-03-10 09:40:27 +01:00
parent 5c67ab2a7a
commit 8f22785cf0
1 changed files with 11 additions and 5 deletions
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16
spa/include/spa/utils/json-core.h
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@ -488,14 +488,20 @@ SPA_API_JSON bool spa_json_is_json_number(const char *val, int len)
/* 7 */ { 3, 3, 8, 8, -1, -1, -1 }, /* after 'e'/'E' */
/* 8 */ { 3, 3, -1, -1, -1, -1, -1 }, /* after exp sign */
};
static const int8_t char_class[128] = {
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, /* 0-15 */
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, /* 16-31 */
6,6,6,6,6,6,6,6,6,6,6,3,6,2,4,6, /* 32-47: + - . */
1,0,0,0,0,0,0,0,0,0,6,6,6,6,6,6, /* 48-63: 0-9 */
6,6,6,6,6,5,6,6,6,6,6,6,6,6,6,6, /* 64-79: E */
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, /* 80-95 */
6,6,6,6,6,5,6,6,6,6,6,6,6,6,6,6, /* 96-111: e */
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, /* 112-127 */
};
int i, state = 4;
for (i = 0; i < len; i++) {
char v = val[i];
int cls = (v >= '1' && v <= '9') ? 0 : v == '0' ? 1 :
v == '-' ? 2 : v == '+' ? 3 : v == '.' ? 4 :
(v == 'e' || v == 'E') ? 5 : 6;
if ((state = trans[state][cls]) < 0)
if ((state = trans[state][char_class[val[i]&0x7f]]) < 0)
return false;
}
return state < 4;