heimdal/lib/asn1/gen_length.c

/*
 * Copyright (c) 1997 - 1999 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 += length_%s(%s);\n", variable, typename, name);
}

static void
length_type (const char *name, const Type *t, const char *variable)
{
  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:
      length_primitive ("integer", name, variable);
      break;
  case TOctetString:
      length_primitive ("octet_string", name, variable);
      break;
  case TBitString: {
      /*
       * XXX - Hope this is correct
       * look at TBitString case in `encode_type'
       */
      fprintf (codefile, "%s += 7;\n", variable);
      break;
  }
  case TSequence: {
      Member *m;
      int tag = -1;

      if (t->members == NULL)
	  break;
      
      for (m = t->members; m && tag != m->val; m = m->next) {
	  char *s;

	  asprintf (&s, "%s(%s)->%s",
		    m->optional ? "" : "&", name, m->gen_name);
	  if (m->optional)
	      fprintf (codefile, "if(%s)", s);
	  fprintf (codefile, "{\n"
		   "int oldret = %s;\n"
		   "%s = 0;\n", variable, variable);
	  length_type (s, m->type, "ret");
	  fprintf (codefile, "%s += 1 + length_len(%s) + oldret;\n",
		   variable, variable);
	  fprintf (codefile, "}\n");
	  if (tag == -1)
	      tag = m->val;
	  free (s);
      }
      fprintf (codefile,
	       "%s += 1 + length_len(%s);\n", variable, variable);
      break;
  }
  case TSequenceOf: {
      char *n;

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

      fprintf (codefile, "for(i = (%s)->len - 1; i >= 0; --i){\n", name);
      asprintf (&n, "&(%s)->val[i]", name);
      length_type(n, t->subtype, variable);
      fprintf (codefile, "}\n");

      fprintf (codefile,
	       "%s += 1 + length_len(%s) + oldret;\n"
	       "}\n", variable, variable);
      free(n);
      break;
  }
  case TGeneralizedTime:
      length_primitive ("generalized_time", name, variable);
      break;
  case TGeneralString:
      length_primitive ("general_string", name, variable);
      break;
  case TApplication:
      length_type (name, t->subtype, variable);
      fprintf (codefile, "ret += 1 + length_len (ret);\n");
      break;
  default :
      abort ();
  }
}

void
generate_type_length (const Symbol *s)
{
  fprintf (headerfile,
	   "size_t length_%s(const %s *);\n",
	   s->gen_name, s->gen_name);

  fprintf (codefile,
	   "size_t\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");
  fprintf (codefile, "return ret;\n}\n\n");
}