/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: rt_21.c,v 1.12 2020/09/14 08:40:43 florian Exp $ */

/* reviewed: Thu Mar 16 15:02:31 PST 2000 by brister */

/* RFC1183 */

#ifndef RDATA_GENERIC_RT_21_C
#define RDATA_GENERIC_RT_21_C

static inline isc_result_t
totext_rt(ARGS_TOTEXT) {
        isc_region_t region;
        dns_name_t name;
        dns_name_t prefix;
        int sub;
        char buf[sizeof("64000")];
        unsigned short num;

        REQUIRE(rdata->type == dns_rdatatype_rt);
        REQUIRE(rdata->length != 0);

        dns_name_init(&name, NULL);
        dns_name_init(&prefix, NULL);

        dns_rdata_toregion(rdata, &region);
        num = uint16_fromregion(&region);
        isc_region_consume(&region, 2);
        snprintf(buf, sizeof(buf), "%u", num);
        RETERR(isc_str_tobuffer(buf, target));
        RETERR(isc_str_tobuffer(" ", target));
        dns_name_fromregion(&name, &region);
        sub = name_prefix(&name, tctx->origin, &prefix);
        return (dns_name_totext(&prefix, sub, target));
}

static inline isc_result_t
fromwire_rt(ARGS_FROMWIRE) {
        dns_name_t name;
        isc_region_t sregion;
        isc_region_t tregion;

        REQUIRE(type == dns_rdatatype_rt);

        UNUSED(type);
        UNUSED(rdclass);

        dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

        dns_name_init(&name, NULL);

        isc_buffer_activeregion(source, &sregion);
        isc_buffer_availableregion(target, &tregion);
        if (tregion.length < 2)
                return (ISC_R_NOSPACE);
        if (sregion.length < 2)
                return (ISC_R_UNEXPECTEDEND);
        memmove(tregion.base, sregion.base, 2);
        isc_buffer_forward(source, 2);
        isc_buffer_add(target, 2);
        return (dns_name_fromwire(&name, source, dctx, options, target));
}

static inline isc_result_t
towire_rt(ARGS_TOWIRE) {
        dns_name_t name;
        dns_offsets_t offsets;
        isc_region_t region;
        isc_region_t tr;

        REQUIRE(rdata->type == dns_rdatatype_rt);
        REQUIRE(rdata->length != 0);

        dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
        isc_buffer_availableregion(target, &tr);
        dns_rdata_toregion(rdata, &region);
        if (tr.length < 2)
                return (ISC_R_NOSPACE);
        memmove(tr.base, region.base, 2);
        isc_region_consume(&region, 2);
        isc_buffer_add(target, 2);

        dns_name_init(&name, offsets);
        dns_name_fromregion(&name, &region);

        return (dns_name_towire(&name, cctx, target));
}

#endif  /* RDATA_GENERIC_RT_21_C */