/*
 * Copyright (c) 1995-2003, Index Data.
 * See the file LICENSE for details.
 *
 * $Id: prt-ext.c,v 1.7 2003/07/18 19:53:28 mike Exp $
 */

#include <yaz/proto.h>

/*
 * The table below should be moved to the ODR structure itself and
 * be an image of the association context: To help
 * map indirect references when they show up. 
 */
static Z_ext_typeent type_table[] =
{
    {VAL_SUTRS, Z_External_sutrs, (Odr_fun) z_SUTRS},
    {VAL_EXPLAIN, Z_External_explainRecord, (Odr_fun)z_ExplainRecord},
    {VAL_RESOURCE1, Z_External_resourceReport1, (Odr_fun)z_ResourceReport1},
    {VAL_RESOURCE2, Z_External_resourceReport2, (Odr_fun)z_ResourceReport2},
    {VAL_PROMPT1, Z_External_promptObject1, (Odr_fun)z_PromptObject1 },
    {VAL_GRS1, Z_External_grs1, (Odr_fun)z_GenericRecord},
    {VAL_EXTENDED, Z_External_extendedService, (Odr_fun)z_TaskPackage},
    {VAL_ITEMORDER, Z_External_itemOrder, (Odr_fun)z_IOItemOrder},
    {VAL_DIAG1, Z_External_diag1, (Odr_fun)z_DiagnosticFormat},
    {VAL_ESPEC1, Z_External_espec1, (Odr_fun)z_Espec1},
    {VAL_SUMMARY, Z_External_summary, (Odr_fun)z_BriefBib},
    {VAL_OPAC, Z_External_OPAC, (Odr_fun)z_OPACRecord},
    {VAL_SEARCHRES1, Z_External_searchResult1, (Odr_fun)z_SearchInfoReport},
    {VAL_DBUPDATE, Z_External_update, (Odr_fun)z_IUUpdate},
    {VAL_DBUPDATE0, Z_External_update0, (Odr_fun)z_IU0Update},
    {VAL_DBUPDATE1, Z_External_update0, (Odr_fun)z_IU0Update},
    {VAL_DATETIME, Z_External_dateTime, (Odr_fun)z_DateTime},
    {VAL_UNIVERSE_REPORT, Z_External_universeReport,(Odr_fun)z_UniverseReport},
    {VAL_ADMINSERVICE, Z_External_ESAdmin, (Odr_fun)z_Admin},
    {VAL_USERINFO1, Z_External_userInfo1, (Odr_fun) z_OtherInformation},
    {VAL_CHARNEG3, Z_External_charSetandLanguageNegotiation, (Odr_fun)
                  z_CharSetandLanguageNegotiation},
    {VAL_PROMPT1, Z_External_acfPrompt1, (Odr_fun) z_PromptObject1},
    {VAL_DES1, Z_External_acfDes1, (Odr_fun) z_DES_RN_Object},
    {VAL_KRB1, Z_External_acfKrb1, (Odr_fun) z_KRBObject},
    {VAL_MULTISRCH2, Z_External_multisrch2, (Odr_fun) z_MultipleSearchTerms_2},
    {VAL_CQL, Z_External_CQL, (Odr_fun) z_InternationalString},
    {VAL_OCLCUI, Z_External_OCLCUserInfo, (Odr_fun) z_OCLC_UserInformation},
    {VAL_NONE, 0, 0}
};

Z_ext_typeent *z_ext_getentbyref(oid_value val)
{
    Z_ext_typeent *i;

    for (i = type_table; i->dref != VAL_NONE; i++)
	if (i->dref == val)
	    return i;
    return 0;
}

int z_External(ODR o, Z_External **p, int opt, const char *name)
{
    oident *oid;
    Z_ext_typeent *type;

    static Odr_arm arm[] =
    {
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_single,
	 (Odr_fun)odr_any, 0},
	{ODR_IMPLICIT, ODR_CONTEXT, 1, Z_External_octet,
	 (Odr_fun)odr_octetstring, 0},
	{ODR_IMPLICIT, ODR_CONTEXT, 2, Z_External_arbitrary,
	 (Odr_fun)odr_bitstring, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_sutrs,
	 (Odr_fun)z_SUTRS, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_explainRecord,
	 (Odr_fun)z_ExplainRecord, 0},

	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_resourceReport1,
	 (Odr_fun)z_ResourceReport1, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_resourceReport2,
	 (Odr_fun)z_ResourceReport2, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_promptObject1,
	 (Odr_fun)z_PromptObject1, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_grs1,
	 (Odr_fun)z_GenericRecord, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_extendedService,
	 (Odr_fun)z_TaskPackage, 0},

	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_itemOrder,
	 (Odr_fun)z_IOItemOrder, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_diag1,
	 (Odr_fun)z_DiagnosticFormat, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_espec1,
	 (Odr_fun)z_Espec1, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_summary,
	 (Odr_fun)z_BriefBib, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_OPAC,
	 (Odr_fun)z_OPACRecord, 0},

	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_searchResult1,
	 (Odr_fun)z_SearchInfoReport, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_update,
	 (Odr_fun)z_IUUpdate, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_dateTime,
	 (Odr_fun)z_DateTime, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_universeReport,
	 (Odr_fun)z_UniverseReport, 0},
	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_ESAdmin,
	 (Odr_fun)z_Admin, 0},

	{ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_update0,
	 (Odr_fun)z_IU0Update, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_userInfo1,
         (Odr_fun)z_OtherInformation, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_charSetandLanguageNegotiation,
         (Odr_fun)z_CharSetandLanguageNegotiation, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_acfPrompt1,
         (Odr_fun)z_PromptObject1, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_acfDes1,
         (Odr_fun)z_DES_RN_Object, 0},

        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_acfKrb1,
         (Odr_fun)z_KRBObject, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_multisrch2,
         (Odr_fun)z_MultipleSearchTerms_2, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_CQL,
         (Odr_fun)z_InternationalString, 0},
        {ODR_EXPLICIT, ODR_CONTEXT, 0, Z_External_OCLCUserInfo,
         (Odr_fun)z_OCLC_UserInformation, 0},
	{-1, -1, -1, -1, 0, 0}
    };
    
    odr_implicit_settag(o, ODR_UNIVERSAL, ODR_EXTERNAL);
    if (!odr_sequence_begin(o, p, sizeof(**p), name))
	return opt && odr_ok(o);
    if (!(odr_oid(o, &(*p)->direct_reference, 1, 0) &&
	  odr_integer(o, &(*p)->indirect_reference, 1, 0) &&
	  odr_graphicstring(o, &(*p)->descriptor, 1, 0)))
	return 0;
    /*
     * Do we know this beast?
     */
    if (o->direction == ODR_DECODE && (*p)->direct_reference &&
	(oid = oid_getentbyoid((*p)->direct_reference)) &&
	(type = z_ext_getentbyref(oid->value)))
    {
	int zclass, tag, cons;
	
	/*
	 * We know it. If it's represented as an ASN.1 type, bias the CHOICE.
	 */
	if (!odr_peektag(o, &zclass, &tag, &cons))
	    return opt && odr_ok(o);
	if (zclass == ODR_CONTEXT && tag == 0 && cons == 1)
	    odr_choice_bias(o, type->what);
    }
    return
	odr_choice(o, arm, &(*p)->u, &(*p)->which, name) &&
	odr_sequence_end(o);
}

Z_External *z_ext_record(ODR o, int format, const char *buf, int len)
{
    Z_External *thisext;

    thisext = (Z_External *) odr_malloc(o, sizeof(*thisext));
    thisext->descriptor = 0;
    thisext->indirect_reference = 0;

    thisext->direct_reference = 
	yaz_oidval_to_z3950oid (o, CLASS_RECSYN, format);    
    if (!thisext->direct_reference)
	return 0;

    if (len < 0) /* Structured data */
    {
	
	/*
	 * We cheat on the pointers here. Obviously, the record field
	 * of the backend-fetch structure should have been a union for
	 * correctness, but we're stuck with this for backwards
	 * compatibility.
	 */
	thisext->u.grs1 = (Z_GenericRecord*) buf;

	switch (format)
	{
	case VAL_SUTRS:
	    thisext->which = Z_External_sutrs;
	    break;
	case VAL_GRS1:
	    thisext->which = Z_External_grs1;
	    break;
	case VAL_EXPLAIN:
	    thisext->which = Z_External_explainRecord;
	    break;
	case VAL_SUMMARY:
	    thisext->which = Z_External_summary;
	    break;
	case VAL_OPAC:
	    thisext->which = Z_External_OPAC;
	    break;
	case VAL_EXTENDED:
	    thisext->which = Z_External_extendedService;
	    break;
	default:
	    return 0;
	}
    }
    else if (format == VAL_SUTRS) /* SUTRS is a single-ASN.1-type */
    {
	Odr_oct *sutrs = (Odr_oct *)odr_malloc(o, sizeof(*sutrs));
	
	thisext->which = Z_External_sutrs;
	thisext->u.sutrs = sutrs;
	sutrs->buf = (unsigned char *)odr_malloc(o, len);
	sutrs->len = sutrs->size = len;
	memcpy(sutrs->buf, buf, len);
    }
    else
    {
	thisext->which = Z_External_octet;
	if (!(thisext->u.octet_aligned = (Odr_oct *)
	      odr_malloc(o, sizeof(Odr_oct))))
	    return 0;
	if (!(thisext->u.octet_aligned->buf = (unsigned char *)
	      odr_malloc(o, len)))
	    return 0;
	memcpy(thisext->u.octet_aligned->buf, buf, len);
	thisext->u.octet_aligned->len = thisext->u.octet_aligned->size = len;
    }
    return thisext;
}

