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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static ngx_uint_t mday[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
time_t
ngx_http_parse_time(u_char *value, size_t len)
{
u_char *p, *end;
ngx_int_t month;
ngx_uint_t day, year, hour, min, sec;
uint64_t time;
enum {
no = 0,
rfc822, /* Tue, 10 Nov 2002 23:50:13 */
rfc850, /* Tuesday, 10-Dec-02 23:50:13 */
isoc /* Tue Dec 10 23:50:13 2002 */
} fmt;
fmt = 0;
end = value + len;
#if (NGX_SUPPRESS_WARN)
day = 32;
year = 2038;
#endif
for (p = value; p < end; p++) {
if (*p == ',') {
break;
}
if (*p == ' ') {
fmt = isoc;
break;
}
}
for (p++; p < end; p++)
if (*p != ' ') {
break;
}
if (end - p < 18) {
return NGX_ERROR;
}
if (fmt != isoc) {
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
return NGX_ERROR;
}
day = (*p - '0') * 10 + *(p + 1) - '0';
p += 2;
if (*p == ' ') {
if (end - p < 18) {
return NGX_ERROR;
}
fmt = rfc822;
} else if (*p == '-') {
fmt = rfc850;
} else {
return NGX_ERROR;
}
p++;
}
switch (*p) {
case 'J':
month = *(p + 1) == 'a' ? 0 : *(p + 2) == 'n' ? 5 : 6;
break;
case 'F':
month = 1;
break;
case 'M':
month = *(p + 2) == 'r' ? 2 : 4;
break;
case 'A':
month = *(p + 1) == 'p' ? 3 : 7;
break;
case 'S':
month = 8;
break;
case 'O':
month = 9;
break;
case 'N':
month = 10;
break;
case 'D':
month = 11;
break;
default:
return NGX_ERROR;
}
p += 3;
if ((fmt == rfc822 && *p != ' ') || (fmt == rfc850 && *p != '-')) {
return NGX_ERROR;
}
p++;
if (fmt == rfc822) {
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
|| *(p + 2) < '0' || *(p + 2) > '9'
|| *(p + 3) < '0' || *(p + 3) > '9')
{
return NGX_ERROR;
}
year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
+ (*(p + 2) - '0') * 10 + *(p + 3) - '0';
p += 4;
} else if (fmt == rfc850) {
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
return NGX_ERROR;
}
year = (*p - '0') * 10 + *(p + 1) - '0';
year += (year < 70) ? 2000 : 1900;
p += 2;
}
if (fmt == isoc) {
if (*p == ' ') {
p++;
}
if (*p < '0' || *p > '9') {
return NGX_ERROR;
}
day = *p++ - '0';
if (*p != ' ') {
if (*p < '0' || *p > '9') {
return NGX_ERROR;
}
day = day * 10 + *p++ - '0';
}
if (end - p < 14) {
return NGX_ERROR;
}
}
if (*p++ != ' ') {
return NGX_ERROR;
}
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
return NGX_ERROR;
}
hour = (*p - '0') * 10 + *(p + 1) - '0';
p += 2;
if (*p++ != ':') {
return NGX_ERROR;
}
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
return NGX_ERROR;
}
min = (*p - '0') * 10 + *(p + 1) - '0';
p += 2;
if (*p++ != ':') {
return NGX_ERROR;
}
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
return NGX_ERROR;
}
sec = (*p - '0') * 10 + *(p + 1) - '0';
if (fmt == isoc) {
p += 2;
if (*p++ != ' ') {
return NGX_ERROR;
}
if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
|| *(p + 2) < '0' || *(p + 2) > '9'
|| *(p + 3) < '0' || *(p + 3) > '9')
{
return NGX_ERROR;
}
year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
+ (*(p + 2) - '0') * 10 + *(p + 3) - '0';
}
if (hour > 23 || min > 59 || sec > 59) {
return NGX_ERROR;
}
if (day == 29 && month == 1) {
if ((year & 3) || ((year % 100 == 0) && (year % 400) != 0)) {
return NGX_ERROR;
}
} else if (day > mday[month]) {
return NGX_ERROR;
}
/*
* shift new year to March 1 and start months from 1 (not 0),
* it is needed for Gauss' formula
*/
if (--month <= 0) {
month += 12;
year -= 1;
}
/* Gauss' formula for Gregorian days since March 1, 1 BC */
time = (uint64_t) (
/* days in years including leap years since March 1, 1 BC */
365 * year + year / 4 - year / 100 + year / 400
/* days before the month */
+ 367 * month / 12 - 30
/* days before the day */
+ day - 1
/*
* 719527 days were between March 1, 1 BC and March 1, 1970,
* 31 and 28 days were in January and February 1970
*/
- 719527 + 31 + 28) * 86400 + hour * 3600 + min * 60 + sec;
#if (NGX_TIME_T_SIZE <= 4)
if (time > 0x7fffffff) {
return NGX_ERROR;
}
#endif
return (time_t) time;
}