source: heimdal/trunk/lib/asn1/gen_free.c

/*
 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "gen_locl.h"

RCSID("$Id$");

static void
free_primitive (const char *typename, const char *name)
{
    fprintf (codefile, "der_free_%s(%s);\n", typename, name);
}

static void
free_type (const char *name, const Type *t, int preserve)
{
    switch (t->type) {
    case TType:
#if 0
        free_type (name, t->symbol->type, preserve);
#endif
        fprintf (codefile, "free_%s(%s);\n", t->symbol->gen_name, name);
        break;
    case TInteger:
        if (t->range == NULL && t->members == NULL) {
            free_primitive ("heim_integer", name);
            break;
        }
    case TBoolean:
    case TEnumerated :
    case TNull:
    case TGeneralizedTime:
    case TUTCTime:
        break;
    case TBitString:
        if (ASN1_TAILQ_EMPTY(t->members))
            free_primitive("bit_string", name);
        break;
    case TOctetString:
        free_primitive ("octet_string", name);
        break;
    case TChoice:
    case TSet:
    case TSequence: {
        Member *m, *have_ellipsis = NULL;

        if (t->members == NULL)
            break;

        if ((t->type == TSequence || t->type == TChoice) && preserve)
            fprintf(codefile, "der_free_octet_string(&data->_save);\n");

        if(t->type == TChoice)
            fprintf(codefile, "switch((%s)->element) {\n", name);

        ASN1_TAILQ_FOREACH(m, t->members, members) {
            char *s;

            if (m->ellipsis){
                have_ellipsis = m;
                continue;
            }

            if(t->type == TChoice)
                fprintf(codefile, "case %s:\n", m->label);
            if (asprintf (&s, "%s(%s)->%s%s",
                          m->optional ? "" : "&", name,
                          t->type == TChoice ? "u." : "", m->gen_name) < 0 || s == NULL)
                errx(1, "malloc");
            if(m->optional)
                fprintf(codefile, "if(%s) {\n", s);
            free_type (s, m->type, FALSE);
            if(m->optional)
                fprintf(codefile,
                        "free(%s);\n"
                        "%s = NULL;\n"
                        "}\n",s, s);
            free (s);
            if(t->type == TChoice)
                fprintf(codefile, "break;\n");
        }

        if(t->type == TChoice) {
            if (have_ellipsis)
                fprintf(codefile,
                        "case %s:\n"
                        "der_free_octet_string(&(%s)->u.%s);\n"
                        "break;",
                        have_ellipsis->label,
                        name, have_ellipsis->gen_name);
            fprintf(codefile, "}\n");
        }
        break;
    }
    case TSetOf:
    case TSequenceOf: {
        char *n;

        fprintf (codefile, "while((%s)->len){\n", name);
        if (asprintf (&n, "&(%s)->val[(%s)->len-1]", name, name) < 0 || n == NULL)
            errx(1, "malloc");
        free_type(n, t->subtype, FALSE);
        fprintf(codefile,
                "(%s)->len--;\n"
                "}\n",
                name);
        fprintf(codefile,
                "free((%s)->val);\n"
                "(%s)->val = NULL;\n", name, name);
        free(n);
        break;
    }
    case TGeneralString:
        free_primitive ("general_string", name);
        break;
    case TTeletexString:
        free_primitive ("general_string", name);
        break;
    case TUTF8String:
        free_primitive ("utf8string", name);
        break;
    case TPrintableString:
        free_primitive ("printable_string", name);
        break;
    case TIA5String:
        free_primitive ("ia5_string", name);
        break;
    case TBMPString:
        free_primitive ("bmp_string", name);
        break;
    case TUniversalString:
        free_primitive ("universal_string", name);
        break;
    case TVisibleString:
        free_primitive ("visible_string", name);
        break;
    case TTag:
        free_type (name, t->subtype, preserve);
        break;
    case TOID :
        free_primitive ("oid", name);
        break;
    default :
        abort ();
    }
}

void
generate_type_free (const Symbol *s)
{
    int preserve = preserve_type(s->name) ? TRUE : FALSE;

    fprintf (codefile, "void ASN1CALL\n"
             "free_%s(%s *data)\n"
             "{\n",
             s->gen_name, s->gen_name);

    free_type ("data", s->type, preserve);
    fprintf (codefile, "}\n\n");
}