view src/http/ngx_http_parse_time.c @ 5114:a46c1cfe7263

Allow to reuse connections that wait their first request. This should improve behavior under deficiency of connections. Since SSL handshake usually takes significant amount of time, we exclude connections from reusable queue during this period to avoid premature flush of them.
author Valentin Bartenev <vbart@nginx.com>
date Fri, 15 Mar 2013 19:49:54 +0000
parents 4c36e15651f7
children
line wrap: on
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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;
}