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[core] http_header_hkey_get() over const array 

fixed-size power-2 struct keylenvalue
http_headers_off[] of offsets into http_headers[] by string length
This commit is contained in:
Glenn Strauss 2019-10-11 01:31:19 -04:00
parent a7a721ab43
commit cff64cf170
1 changed files with 11 additions and 4 deletions
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15
src/http_header.c
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@ -9,12 +9,17 @@
typedef struct keyvlenvalue {
const int key;
const unsigned int vlen;
const char * const value;
const char value[24];
} keyvlenvalue;
/* Note: must be sorted by length */
/* Note: must be kept in sync with http_header.h enum http_header_e */
#define CONST_LEN_STR(x) (unsigned int)(sizeof(x)-1), (x)
/* Note: must be kept in sync http_headers[] and http_headers_off[] */
/* http_headers_off lists first offset at which string of specific len occur */
int8_t http_headers_off[] = {
-1, -1, -1, -1, 0, 4, 5, 9, 10, 11, 12, -1, 15, 16, 20, 21, 23, 25
};
#define CONST_LEN_STR(x) (unsigned int)(sizeof(x)-1), x
static const keyvlenvalue http_headers[] = {
{ HTTP_HEADER_HOST, CONST_LEN_STR("Host") }
,{ HTTP_HEADER_DATE, CONST_LEN_STR("Date") }
@ -44,12 +49,14 @@ static const keyvlenvalue http_headers[] = {
,{ HTTP_HEADER_IF_MODIFIED_SINCE, CONST_LEN_STR("If-Modified-Since") }
,{ HTTP_HEADER_TRANSFER_ENCODING, CONST_LEN_STR("Transfer-Encoding") }
,{ HTTP_HEADER_X_FORWARDED_PROTO, CONST_LEN_STR("X-Forwarded-Proto") }
,{ HTTP_HEADER_OTHER, 0, NULL }
,{ HTTP_HEADER_OTHER, 0, "" }
};
enum http_header_e http_header_hkey_get(const char *s, size_t slen) {
const struct keyvlenvalue * const kv = http_headers;
for (int i = 0; kv[i].vlen && slen >= kv[i].vlen; ++i) {
int i = slen < sizeof(http_headers_off) ? http_headers_off[slen] : -1;
if (i < 0) return HTTP_HEADER_OTHER;
for (; slen == kv[i].vlen; ++i) {
if (slen == kv[i].vlen
&& buffer_eq_icase_ssn(s, kv[i].value, slen))
return (enum http_header_e)kv[i].key;