/*

 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <time.h>

#include "internal/cryptlib.h"

#include <openssl/asn1.h>

#include "asn1_local.h"

#include <openssl/asn1t.h>

IMPLEMENT_ASN1_DUP_FUNCTION(ASN1_UTCTIME)

/* This is the primary function used to parse ASN1_UTCTIME */

int ossl_asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d)

{

    /* wrapper around ossl_asn1_time_to_tm */

    if (d->type != V_ASN1_UTCTIME)

        return 0;

    return ossl_asn1_time_to_tm(tm, d);

}

int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)

{

    return ossl_asn1_utctime_to_tm(NULL, d);

}

/* Sets the string via simple copy without cleaning it up */

int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)

{

    ASN1_UTCTIME t;

    t.type = V_ASN1_UTCTIME;

    t.length = strlen(str);

    t.data = (unsigned char *)str;

    t.flags = 0;

    if (!ASN1_UTCTIME_check(&t))

        return 0;

    if (s != NULL && !ASN1_STRING_copy(s, &t))

        return 0;

    return 1;

}

ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)

{

    return ASN1_UTCTIME_adj(s, t, 0, 0);

}

ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,

                               int offset_day, long offset_sec)

{

    struct tm *ts;

    struct tm data;

    ts = OPENSSL_gmtime(&t, &data);

    if (ts == NULL)

        return NULL;

    if (offset_day || offset_sec) {

        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))

            return NULL;

    }

    return ossl_asn1_time_from_tm(s, ts, V_ASN1_UTCTIME);

}

int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)

{

    struct tm stm, ttm;

    int day, sec;

    if (!ossl_asn1_utctime_to_tm(&stm, s))

        return -2;

    if (OPENSSL_gmtime(&t, &ttm) == NULL)

        return -2;

    if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))

        return -2;

    if (day > 0 || sec > 0)

        return 1;

    if (day < 0 || sec < 0)

        return -1;

    return 0;

}

int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm)

{

    if (tm->type != V_ASN1_UTCTIME)

        return 0;

    return ASN1_TIME_print(bp, tm);

}