/*
 * 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
length_primitive (const char *typename,
                  const char *name,
                  const char *variable)
{
    fprintf (codefile, "%s += der_length_%s(%s);\n", variable, typename, name);
}

/* XXX same as der_length_tag */
static size_t
length_tag(unsigned int tag)
{
    size_t len = 0;

    if(tag <= 30)
        return 1;
    while(tag) {
        tag /= 128;
        len++;
    }
    return len + 1;
}


static int
length_type (const char *name, const Type *t,
             const char *variable, const char *tmpstr)
{
    switch (t->type) {
    case TType:
#if 0
        length_type (name, t->symbol->type);
#endif
        fprintf (codefile, "%s += length_%s(%s);\n",
                 variable, t->symbol->gen_name, name);
        break;
    case TInteger:
        if(t->members) {
            fprintf(codefile,
                    "{\n"
                    "int enumint = *%s;\n", name);
            length_primitive ("integer", "&enumint", variable);
            fprintf(codefile, "}\n");
        } else if (t->range == NULL) {
            length_primitive ("heim_integer", name, variable);
        } else if (t->range->min < INT_MIN && t->range->max <= INT64_MAX) {
            length_primitive ("integer64", name, variable);
        } else if (t->range->min >= 0 && t->range->max > UINT_MAX) {
            length_primitive ("unsigned64", name, variable);
        } else if (t->range->min >= INT_MIN && t->range->max <= INT_MAX) {
            length_primitive ("integer", name, variable);
        } else if (t->range->min >= 0 && t->range->max <= UINT_MAX) {
            length_primitive ("unsigned", name, variable);
        } else
            errx(1, "%s: unsupported range %" PRId64 " -> %" PRId64,
                 name, t->range->min, t->range->max);

        break;
    case TBoolean:
        fprintf (codefile, "%s += 1;\n", variable);
        break;
    case TEnumerated :
        length_primitive ("enumerated", name, variable);
        break;
    case TOctetString:
        length_primitive ("octet_string", name, variable);
        break;
    case TBitString: {
        if (ASN1_TAILQ_EMPTY(t->members))
            length_primitive("bit_string", name, variable);
        else {
            if (!rfc1510_bitstring) {
                Member *m;
                int pos = ASN1_TAILQ_LAST(t->members, memhead)->val;

                fprintf(codefile,
                        "do {\n");
                ASN1_TAILQ_FOREACH_REVERSE(m, t->members, memhead, members) {
                    while (m->val / 8 < pos / 8) {
                        pos -= 8;
                    }
                    fprintf (codefile,
                             "if((%s)->%s) { %s += %d; break; }\n",
                             name, m->gen_name, variable, (pos + 8) / 8);
                }
                fprintf(codefile,
                        "} while(0);\n");
                fprintf (codefile, "%s += 1;\n", variable);
            } else {
                fprintf (codefile, "%s += 5;\n", variable);
            }
        }
        break;
    }
    case TSet:
    case TSequence:
    case TChoice: {
        Member *m, *have_ellipsis = NULL;

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

        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)", s);
            else if(m->defval)
                gen_compare_defval(s + 1, m->defval);
            fprintf (codefile, "{\n"
                     "size_t %s_oldret = %s;\n"
                     "%s = 0;\n", tmpstr, variable, variable);
            length_type (s, m->type, "ret", m->gen_name);
            fprintf (codefile, "ret += %s_oldret;\n", tmpstr);
            fprintf (codefile, "}\n");
            free (s);
            if(t->type == TChoice)
                fprintf(codefile, "break;\n");
        }
        if(t->type == TChoice) {
            if (have_ellipsis)
                fprintf(codefile,
                        "case %s:\n"
                        "ret += (%s)->u.%s.length;\n"
                        "break;\n",
                        have_ellipsis->label,
                        name,
                        have_ellipsis->gen_name);
            fprintf (codefile, "}\n"); /* switch */
        }
        break;
    }
    case TSetOf:
    case TSequenceOf: {
        char *n = NULL;
        char *sname = NULL;

        fprintf (codefile,
                 "{\n"
                 "size_t %s_oldret = %s;\n"
                 "int i;\n"
                 "%s = 0;\n",
                 tmpstr, variable, variable);

        fprintf (codefile, "for(i = (%s)->len - 1; i >= 0; --i){\n", name);
        fprintf (codefile, "size_t %s_for_oldret = %s;\n"
                 "%s = 0;\n", tmpstr, variable, variable);
        if (asprintf (&n, "&(%s)->val[i]", name) < 0  || n == NULL)
            errx(1, "malloc");
        if (asprintf (&sname, "%s_S_Of", tmpstr) < 0 || sname == NULL)
            errx(1, "malloc");
        length_type(n, t->subtype, variable, sname);
        fprintf (codefile, "%s += %s_for_oldret;\n",
                 variable, tmpstr);
        fprintf (codefile, "}\n");

        fprintf (codefile,
                 "%s += %s_oldret;\n"
                 "}\n", variable, tmpstr);
        free(n);
        free(sname);
        break;
    }
    case TGeneralizedTime:
        length_primitive ("generalized_time", name, variable);
        break;
    case TGeneralString:
        length_primitive ("general_string", name, variable);
        break;
    case TTeletexString:
        length_primitive ("general_string", name, variable);
        break;
    case TUTCTime:
        length_primitive ("utctime", name, variable);
        break;
    case TUTF8String:
        length_primitive ("utf8string", name, variable);
        break;
    case TPrintableString:
        length_primitive ("printable_string", name, variable);
        break;
    case TIA5String:
        length_primitive ("ia5_string", name, variable);
        break;
    case TBMPString:
        length_primitive ("bmp_string", name, variable);
        break;
    case TUniversalString:
        length_primitive ("universal_string", name, variable);
        break;
    case TVisibleString:
        length_primitive ("visible_string", name, variable);
        break;
    case TNull:
        fprintf (codefile, "/* NULL */\n");
        break;
    case TTag:{
        char *tname = NULL;
        if (asprintf(&tname, "%s_tag", tmpstr) < 0 || tname == NULL)
            errx(1, "malloc");
        length_type (name, t->subtype, variable, tname);
        fprintf (codefile, "ret += %lu + der_length_len (ret);\n",
                 (unsigned long)length_tag(t->tag.tagvalue));
        free(tname);
        break;
    }
    case TOID:
        length_primitive ("oid", name, variable);
        break;
    default :
        abort ();
    }
    return 0;
}

void
generate_type_length (const Symbol *s)
{
    fprintf (codefile,
             "size_t ASN1CALL\n"
             "length_%s(const %s *data)\n"
             "{\n"
             "size_t ret = 0;\n",
             s->gen_name, s->gen_name);

    length_type ("data", s->type, "ret", "Top");
    fprintf (codefile, "return ret;\n}\n\n");
}