/*
 * Copyright (c) 2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 1998-1999 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 */
/*
 *  Copyright (c) 1990 Regents of the University of Michigan.
 *  All rights reserved.
 */
/*
 *  getattr.c
 */

#if 0
#ifndef lint
static char copyright[] = "@(#) Copyright (c) 1990 Regents of the University of Michigan.\nAll rights reserved.\n";
#endif
#endif

#include "ldap-int.h"


static ber_len_t
bytes_remaining( BerElement *ber )
{
        ber_len_t       len;

        if ( ber_get_option( ber, LBER_OPT_REMAINING_BYTES, &len ) != 0 ) {
                return( 0 );    /* not sure what else to do.... */
        }
        return( len );
}


char *
LDAP_CALL
ldap_first_attribute( LDAP *ld, LDAPMessage *entry, BerElement **ber )
{
        char    *attr;
        int     err;
        ber_int_t       seqlength;

        LDAPDebug( LDAP_DEBUG_TRACE, "ldap_first_attribute\n", 0, 0, 0 );

        if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
                return( NULL );         /* punt */
        }

        if ( ber == NULL || !NSLDAPI_VALID_LDAPMESSAGE_ENTRY_POINTER( entry )) {
                LDAP_SET_LDERRNO( ld, LDAP_PARAM_ERROR, NULL, NULL );
                return( NULL );
        }

        if ( nsldapi_alloc_ber_with_options( ld, ber ) != LDAP_SUCCESS ) {
                return( NULL );
        }

        **ber = *entry->lm_ber;

        attr = NULL;                    /* pessimistic */
        err = LDAP_DECODING_ERROR;      /* ditto */

        /*
         * Skip past the sequence, dn, and sequence of sequence.
         * Reset number of bytes remaining so we confine the rest of our
         * decoding to the current sequence.
         */
        if ( ber_scanf( *ber, "{xl{", &seqlength ) != LBER_ERROR &&
             ber_set_option( *ber, LBER_OPT_REMAINING_BYTES, &seqlength )
            == 0 ) {
                /* snarf the attribute type, and skip the set of values,
                 * leaving us positioned right before the next attribute
                 * type/value sequence.
                 */
                if ( ber_scanf( *ber, "{ax}", &attr ) != LBER_ERROR ||
                    bytes_remaining( *ber ) == 0 ) {
                        err = LDAP_SUCCESS;
                }
        }

        LDAP_SET_LDERRNO( ld, err, NULL, NULL );
        if ( attr == NULL || err != LDAP_SUCCESS ) {
                ber_free( *ber, 0 );
                *ber = NULL;
        }
        return( attr );
}

/* ARGSUSED */
char *
LDAP_CALL
ldap_next_attribute( LDAP *ld, LDAPMessage *entry, BerElement *ber )
{
        char    *attr;
        int     err;

        LDAPDebug( LDAP_DEBUG_TRACE, "ldap_next_attribute\n", 0, 0, 0 );

        if ( !NSLDAPI_VALID_LDAP_POINTER( ld )) {
                return( NULL );         /* punt */
        }

        if ( ber == NULL || !NSLDAPI_VALID_LDAPMESSAGE_ENTRY_POINTER( entry )) {
                LDAP_SET_LDERRNO( ld, LDAP_PARAM_ERROR, NULL, NULL );
                return( NULL );
        }

        attr = NULL;                    /* pessimistic */
        err = LDAP_DECODING_ERROR;      /* ditto */

        /* skip sequence, snarf attribute type, skip values */
        if ( ber_scanf( ber, "{ax}", &attr ) != LBER_ERROR ||
            bytes_remaining( ber ) == 0 ) {
                err = LDAP_SUCCESS;
        }

        LDAP_SET_LDERRNO( ld, err, NULL, NULL );
        return( attr );
}