/*-
 * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <UTCTime.h>
#include <GeneralizedTime.h>
#include <errno.h>

#ifdef	__CYGWIN__
#include "/usr/include/time.h"
#else
#include <time.h>
#endif	/* __CYGWIN__ */

#ifndef	ASN___INTERNAL_TEST_MODE

/*
 * UTCTime basic type description.
 */
static const ber_tlv_tag_t asn_DEF_UTCTime_tags[] = {
	(ASN_TAG_CLASS_UNIVERSAL | (23 << 2)),	/* [UNIVERSAL 23] IMPLICIT ...*/
	(ASN_TAG_CLASS_UNIVERSAL | (26 << 2)),  /* [UNIVERSAL 26] IMPLICIT ...*/
	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))    /* ... OCTET STRING */
};
static asn_per_constraints_t asn_DEF_UTCTime_constraints = {
        { APC_CONSTRAINED, 7, 7, 0x20, 0x7e },  /* Value */
        { APC_SEMI_CONSTRAINED, -1, -1, 0, 0 }, /* Size */
        0, 0
};
asn_TYPE_operation_t asn_OP_UTCTime = {
	OCTET_STRING_free,
	UTCTime_print,
	UTCTime_compare,
	OCTET_STRING_decode_ber,    /* Implemented in terms of OCTET STRING */
	OCTET_STRING_encode_der,    /* Implemented in terms of OCTET STRING */
	OCTET_STRING_decode_xer_utf8,
	UTCTime_encode_xer,
#ifdef	ASN_DISABLE_OER_SUPPORT
	0,
	0,
#else
	OCTET_STRING_decode_oer,
	OCTET_STRING_encode_oer,
#endif  /* ASN_DISABLE_OER_SUPPORT */
#ifdef	ASN_DISABLE_PER_SUPPORT
	0,
	0,
#else
	OCTET_STRING_decode_uper,
	OCTET_STRING_encode_uper,
#endif	/* ASN_DISABLE_PER_SUPPORT */
	UTCTime_random_fill,
	0	/* Use generic outmost tag fetcher */
};
asn_TYPE_descriptor_t asn_DEF_UTCTime = {
	"UTCTime",
	"UTCTime",
	&asn_OP_UTCTime,
	asn_DEF_UTCTime_tags,
	sizeof(asn_DEF_UTCTime_tags)
	  / sizeof(asn_DEF_UTCTime_tags[0]) - 2,
	asn_DEF_UTCTime_tags,
	sizeof(asn_DEF_UTCTime_tags)
	  / sizeof(asn_DEF_UTCTime_tags[0]),
	{ 0, &asn_DEF_UTCTime_constraints, UTCTime_constraint },
	0, 0,	/* No members */
	0	/* No specifics */
};

#endif	/* ASN___INTERNAL_TEST_MODE */

/*
 * Check that the time looks like the time.
 */
int
UTCTime_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
                   asn_app_constraint_failed_f *ctfailcb, void *app_key) {
    const UTCTime_t *st = (const UTCTime_t *)sptr;
	time_t tloc;

	errno = EPERM;			/* Just an unlikely error code */
	tloc = asn_UT2time(st, 0, 0);
	if(tloc == -1 && errno != EPERM) {
        ASN__CTFAIL(app_key, td, sptr, "%s: Invalid time format: %s (%s:%d)",
                    td->name, strerror(errno), __FILE__, __LINE__);
        return -1;
	}

	return 0;
}

#ifndef	ASN___INTERNAL_TEST_MODE

asn_enc_rval_t
UTCTime_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr,
                   int ilevel, enum xer_encoder_flags_e flags,
                   asn_app_consume_bytes_f *cb, void *app_key) {
    if(flags & XER_F_CANONICAL) {
		asn_enc_rval_t rv;
		UTCTime_t *ut;
		struct tm tm;

		errno = EPERM;
		if(asn_UT2time((const UTCTime_t *)sptr, &tm, 1) == -1
				&& errno != EPERM)
			ASN__ENCODE_FAILED;

		/* Fractions are not allowed in UTCTime */
		ut = asn_time2UT(0, &tm, 1);
		if(!ut) ASN__ENCODE_FAILED;

		rv = OCTET_STRING_encode_xer_utf8(td, sptr, ilevel, flags,
			cb, app_key);
		OCTET_STRING_free(&asn_DEF_UTCTime, ut, 0);
		return rv;
	} else {
		return OCTET_STRING_encode_xer_utf8(td, sptr, ilevel, flags,
			cb, app_key);
	}
}

#endif	/* ASN___INTERNAL_TEST_MODE */

int
UTCTime_print(const asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
              asn_app_consume_bytes_f *cb, void *app_key) {
    const UTCTime_t *st = (const UTCTime_t *)sptr;

	(void)td;	/* Unused argument */
	(void)ilevel;	/* Unused argument */

	if(st && st->buf) {
		char buf[32];
		struct tm tm;
		int ret;

		errno = EPERM;
		if(asn_UT2time(st, &tm, 1) == -1 && errno != EPERM)
			return (cb("<bad-value>", 11, app_key) < 0) ? -1 : 0;

		ret = snprintf(buf, sizeof(buf),
			"%04d-%02d-%02d %02d:%02d:%02d (GMT)",
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
			tm.tm_hour, tm.tm_min, tm.tm_sec);
		assert(ret > 0 && ret < (int)sizeof(buf));
		return (cb(buf, ret, app_key) < 0) ? -1 : 0;
	} else {
		return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
	}
}

time_t
asn_UT2time(const UTCTime_t *st, struct tm *_tm, int as_gmt) {
	char buf[24];	/* "AAMMJJhhmmss+hhmm" + cushion */
	GeneralizedTime_t gt;

	if(!st || !st->buf
	|| st->size < 11 || st->size >= ((int)sizeof(buf) - 2)) {
		errno = EINVAL;
		return -1;
	}

	gt.buf = (unsigned char *)buf;
	gt.size = st->size + 2;
	memcpy(gt.buf + 2, st->buf, st->size);
	if(st->buf[0] > 0x35) {
		/* 19xx */
		gt.buf[0] = 0x31;
		gt.buf[1] = 0x39;
	} else {
		/* 20xx */
		gt.buf[0] = 0x32;
		gt.buf[1] = 0x30;
	}

	return asn_GT2time(&gt, _tm, as_gmt);
}

UTCTime_t *
asn_time2UT(UTCTime_t *opt_ut, const struct tm *tm, int force_gmt) {
	GeneralizedTime_t *gt = (GeneralizedTime_t *)opt_ut;

	gt = asn_time2GT(gt, tm, force_gmt);
	if(gt == 0) return 0;

	assert(gt->size >= 2);
	gt->size -= 2;
	memmove(gt->buf, gt->buf + 2, gt->size + 1);

	return (UTCTime_t *)gt;
}


asn_random_fill_result_t
UTCTime_random_fill(const asn_TYPE_descriptor_t *td, void **sptr,
                    const asn_encoding_constraints_t *constraints,
                    size_t max_length) {
    asn_random_fill_result_t result_ok = {ARFILL_OK, 1};
    asn_random_fill_result_t result_failed = {ARFILL_FAILED, 0};
    asn_random_fill_result_t result_skipped = {ARFILL_SKIPPED, 0};
    static const char *values[] = {
        "700101000000",  "700101000000-0000", "700101000000+0000",
        "700101000000Z", "821106210623",      "691106210827-0500",
        "821106210629Z",
    };
    size_t rnd = asn_random_between(0, sizeof(values)/sizeof(values[0])-1);

    (void)constraints;

    if(max_length < sizeof("yymmddhhmmss") && !*sptr) {
        return result_skipped;
    }

    if(*sptr) {
        if(OCTET_STRING_fromBuf(*sptr, values[rnd], -1) != 0) {
            if(!sptr) return result_failed;
        }
    } else {
        *sptr = OCTET_STRING_new_fromBuf(td, values[rnd], -1);
        if(!sptr) return result_failed;
    }

    return result_ok;
}

int
UTCTime_compare(const asn_TYPE_descriptor_t *td, const void *aptr,
                        const void *bptr) {
    const GeneralizedTime_t *a = aptr;
    const GeneralizedTime_t *b = bptr;

    (void)td;

    if(a && b) {
        time_t at, bt;
        int aerr, berr;

        errno = EPERM;
        at = asn_UT2time(a, 0, 0);
        aerr = errno;
        errno = EPERM;
        bt = asn_UT2time(b, 0, 0);
        berr = errno;

        if(at == -1 && aerr != EPERM) {
            if(bt == -1 && berr != EPERM) {
                return OCTET_STRING_compare(td, aptr, bptr);
            } else {
                return -1;
            }
        } else if(bt == -1 && berr != EPERM) {
            return 1;
        } else {
            /* Both values are valid. */
        }

        if(at < bt) {
            return -1;
        } else if(at > bt) {
            return 1;
        } else {
            return 0;
        }
    } else if(!a && !b) {
        return 0;
    } else if(!a) {
        return -1;
    } else {
        return 1;
    }
}