text: /*	$NetBSD: txt_16.c,v 1.7 2015/07/08 17:28:59 christos Exp $	*/
  
  /*
   * Copyright (C) 2004, 2007-2009, 2012, 2014  Internet Systems Consortium, Inc. ("ISC")
   * Copyright (C) 1998-2002  Internet Software Consortium.
   *
   * 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: txt_16.c,v 1.47 2009/12/04 22:06:37 tbox Exp  */
  
  /* Reviewed: Thu Mar 16 15:40:00 PST 2000 by bwelling */
  
  #ifndef RDATA_GENERIC_TXT_16_C
  #define RDATA_GENERIC_TXT_16_C
  
  #define RRTYPE_TXT_ATTRIBUTES (0)
  
  static inline isc_result_t
  fromtext_txt(ARGS_FROMTEXT) {
  	isc_token_t token;
  	int strings;
  
  	REQUIRE(type == 16);
  
  	UNUSED(type);
  	UNUSED(rdclass);
  	UNUSED(origin);
  	UNUSED(options);
  	UNUSED(callbacks);
  
  	strings = 0;
  	if ((options & DNS_RDATA_UNKNOWNESCAPE) != 0) {
  		isc_textregion_t r;
  		DE_CONST("#", r.base);
  		r.length = 1;
  		RETERR(txt_fromtext(&r, target));
  		strings++;
  	}
  	for (;;) {
  		RETERR(isc_lex_getmastertoken(lexer, &token,
  					      isc_tokentype_qstring,
  					      ISC_TRUE));
  		if (token.type != isc_tokentype_qstring &&
  		    token.type != isc_tokentype_string)
  			break;
  		RETTOK(txt_fromtext(&token.value.as_textregion, target));
  		strings++;
  	}
  	/* Let upper layer handle eol/eof. */
  	isc_lex_ungettoken(lexer, &token);
  	return (strings == 0 ? ISC_R_UNEXPECTEDEND : ISC_R_SUCCESS);
  }
  
  static inline isc_result_t
  totext_txt(ARGS_TOTEXT) {
  	isc_region_t region;
  
  	UNUSED(tctx);
  
  	REQUIRE(rdata->type == 16);
  
  	dns_rdata_toregion(rdata, &region);
  
  	while (region.length > 0) {
  		RETERR(txt_totext(&region, ISC_TRUE, target));
  		if (region.length > 0)
  			RETERR(str_totext(" ", target));
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  static inline isc_result_t
  fromwire_txt(ARGS_FROMWIRE) {
  	isc_result_t result;
  
  	REQUIRE(type == 16);
  
  	UNUSED(type);
  	UNUSED(dctx);
  	UNUSED(rdclass);
  	UNUSED(options);
  
  	do {
  		result = txt_fromwire(source, target);
  		if (result != ISC_R_SUCCESS)
  			return (result);
  	} while (!buffer_empty(source));
  	return (ISC_R_SUCCESS);
  }
  
  static inline isc_result_t
  towire_txt(ARGS_TOWIRE) {
  	isc_region_t region;
  
  	REQUIRE(rdata->type == 16);
  
  	UNUSED(cctx);
  
  	isc_buffer_availableregion(target, &region);
  	if (region.length < rdata->length)
  		return (ISC_R_NOSPACE);
  
  	memmove(region.base, rdata->data, rdata->length);
  	isc_buffer_add(target, rdata->length);
  	return (ISC_R_SUCCESS);
  }
  
  static inline int
  compare_txt(ARGS_COMPARE) {
  	isc_region_t r1;
  	isc_region_t r2;
  
  	REQUIRE(rdata1->type == rdata2->type);
  	REQUIRE(rdata1->rdclass == rdata2->rdclass);
  	REQUIRE(rdata1->type == 16);
  
  	dns_rdata_toregion(rdata1, &r1);
  	dns_rdata_toregion(rdata2, &r2);
  	return (isc_region_compare(&r1, &r2));
  }
  
  static inline isc_result_t
  fromstruct_txt(ARGS_FROMSTRUCT) {
  	dns_rdata_txt_t *txt = source;
  	isc_region_t region;
  	isc_uint8_t length;
  
  	REQUIRE(type == 16);
  	REQUIRE(source != NULL);
  	REQUIRE(txt->common.rdtype == type);
  	REQUIRE(txt->common.rdclass == rdclass);
  	REQUIRE(txt->txt != NULL && txt->txt_len != 0);
  
  	UNUSED(type);
  	UNUSED(rdclass);
  
  	region.base = txt->txt;
  	region.length = txt->txt_len;
  	while (region.length > 0) {
  		length = uint8_fromregion(&region);
  		isc_region_consume(&region, 1);
  		if (region.length < length)
  			return (ISC_R_UNEXPECTEDEND);
  		isc_region_consume(&region, length);
  	}
  
  	return (mem_tobuffer(target, txt->txt, txt->txt_len));
  }
  
  static inline isc_result_t
  tostruct_txt(ARGS_TOSTRUCT) {
  	dns_rdata_txt_t *txt = target;
  	isc_region_t r;
  
  	REQUIRE(rdata->type == 16);
  	REQUIRE(target != NULL);
  
  	txt->common.rdclass = rdata->rdclass;
  	txt->common.rdtype = rdata->type;
  	ISC_LINK_INIT(&txt->common, link);
  
  	dns_rdata_toregion(rdata, &r);
  	txt->txt_len = r.length;
  	txt->txt = mem_maybedup(mctx, r.base, r.length);
  	if (txt->txt == NULL)
  		return (ISC_R_NOMEMORY);
  
  	txt->offset = 0;
  	txt->mctx = mctx;
  	return (ISC_R_SUCCESS);
  }
  
  static inline void
  freestruct_txt(ARGS_FREESTRUCT) {
  	dns_rdata_txt_t *txt = source;
  
  	REQUIRE(source != NULL);
  	REQUIRE(txt->common.rdtype == 16);
  
  	if (txt->mctx == NULL)
  		return;
  
  	if (txt->txt != NULL)
  		isc_mem_free(txt->mctx, txt->txt);
  	txt->mctx = NULL;
  }
  
  static inline isc_result_t
  additionaldata_txt(ARGS_ADDLDATA) {
  	REQUIRE(rdata->type == 16);
  
  	UNUSED(rdata);
  	UNUSED(add);
  	UNUSED(arg);
  
  	return (ISC_R_SUCCESS);
  }
  
  static inline isc_result_t
  digest_txt(ARGS_DIGEST) {
  	isc_region_t r;
  
  	REQUIRE(rdata->type == 16);
  
  	dns_rdata_toregion(rdata, &r);
  
  	return ((digest)(arg, &r));
  }
  
  static inline isc_boolean_t
  checkowner_txt(ARGS_CHECKOWNER) {
  
  	REQUIRE(type == 16);
  
  	UNUSED(name);
  	UNUSED(type);
  	UNUSED(rdclass);
  	UNUSED(wildcard);
  
  	return (ISC_TRUE);
  }
  
  static inline isc_boolean_t
  checknames_txt(ARGS_CHECKNAMES) {
  
  	REQUIRE(rdata->type == 16);
  
  	UNUSED(rdata);
  	UNUSED(owner);
  	UNUSED(bad);
  
  	return (ISC_TRUE);
  }
  
  static inline isc_result_t
  casecompare_txt(ARGS_COMPARE) {
  	return (compare_txt(rdata1, rdata2));
  }
  
  isc_result_t
  dns_rdata_txt_first(dns_rdata_txt_t *txt) {
  
  	REQUIRE(txt != NULL);
  	REQUIRE(txt->common.rdtype == 16);
  	REQUIRE(txt->txt != NULL || txt->txt_len == 0);
  
  	if (txt->txt_len == 0)
  		return (ISC_R_NOMORE);
  
  	txt->offset = 0;
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  dns_rdata_txt_next(dns_rdata_txt_t *txt) {
  	isc_region_t r;
  	isc_uint8_t length;
  
  	REQUIRE(txt != NULL);
  	REQUIRE(txt->common.rdtype == 16);
  	REQUIRE(txt->txt != NULL && txt->txt_len != 0);
  
  	INSIST(txt->offset + 1 <= txt->txt_len);
  	r.base = txt->txt + txt->offset;
  	r.length = txt->txt_len - txt->offset;
  	length = uint8_fromregion(&r);
  	INSIST(txt->offset + 1 + length <= txt->txt_len);
  	txt->offset = txt->offset + 1 + length;
  	if (txt->offset == txt->txt_len)
  		return (ISC_R_NOMORE);
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  dns_rdata_txt_current(dns_rdata_txt_t *txt, dns_rdata_txt_string_t *string) {
  	isc_region_t r;
  
  	REQUIRE(txt != NULL);
  	REQUIRE(string != NULL);
  	REQUIRE(txt->common.rdtype == 16);
  	REQUIRE(txt->txt != NULL);
  	REQUIRE(txt->offset < txt->txt_len);
  
  	INSIST(txt->offset + 1 <= txt->txt_len);
  	r.base = txt->txt + txt->offset;
  	r.length = txt->txt_len - txt->offset;
  
  	string->length = uint8_fromregion(&r);
  	isc_region_consume(&r, 1);
  	string->data = r.base;
  	INSIST(txt->offset + 1 + string->length <= txt->txt_len);
  
  	return (ISC_R_SUCCESS);
  }
  #endif	/* RDATA_GENERIC_TXT_16_C */
  