/*
 * Copyright (c) 1997 - 2001 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 "der_locl.h"

#if 0
RCSID("$Id: der_length.c,v 1.1 2003/09/05 08:54:08 kouril Exp $");
#endif

static size_t
len_unsigned (unsigned val)
{
  size_t ret = 0;

  do {
    ++ret;
    val /= 256;
  } while (val);
  return ret;
}

static size_t
len_int (int val)
{
  size_t ret = 0;

  if (val == 0)
    return 1;
  while (val > 255 || val < -255) {
    ++ret;
    val /= 256;
  }
  if (val != 0) {
    ++ret;
    if ((signed char)val != val)
      ++ret;
    val /= 256;
  }
  return ret;
}

static size_t
len_oid (const oid *oid)
{
    size_t ret = 1;
    int n;

    for (n = 2; n < oid->length; ++n) {
	unsigned u = oid->components[n];

	++ret;
	u /= 128;
	while (u > 0) {
	    ++ret;
	    u /= 128;
	}
    }
    return ret;
}

size_t
length_len (size_t len)
{
  if (len < 128)
    return 1;
  else
    return len_unsigned (len) + 1;
}

size_t
length_integer (const int *data)
{
  size_t len = len_int (*data);

  return 1 + length_len(len) + len;
}

size_t
length_unsigned (const unsigned *data)
{
  size_t len = len_unsigned (*data);

  return 1 + length_len(len) + len;
}

size_t
length_enumerated (const unsigned *data)
{
  size_t len = len_int (*data);

  return 1 + length_len(len) + len;
}

size_t
length_general_string (const general_string *data)
{
  char *str = *data;
  size_t len = strlen(str);
  return 1 + length_len(len) + len;
}

size_t
length_octet_string (const octet_string *k)
{
  return 1 + length_len(k->length) + k->length;
}

size_t
length_oid (const oid *k)
{
  size_t len = len_oid (k);

  return 1 + length_len(len) + len;
}

size_t
length_generalized_time (const time_t *t)
{
  octet_string k;
  size_t ret;

  time2generalizedtime (*t, &k);
  ret = 1 + length_len(k.length) + k.length;
  free (k.data);
  return ret;
}
