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/* encode.c -- encoding and decoding of CoAP data types

 *

 * Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>

 *

 * This file is part of the CoAP library libcoap. Please see

 * README for terms of use. 

 */



#ifndef NDEBUG

#  include <stdio.h>

#endif



#include "config.h"

#include "encode.h"



/* Carsten suggested this when fls() is not available: */

int coap_fls(unsigned int i) {

  int n;

  for (n = 0; i; n++)

    i >>= 1;

  return n;

}



unsigned int

coap_decode_var_bytes(unsigned char *buf,unsigned int len) {

  unsigned int i, n = 0;

  for (i = 0; i < len; ++i)

    n = (n << 8) + buf[i];



  return n;

}



unsigned int

coap_encode_var_bytes(unsigned char *buf, unsigned int val) {

  unsigned int n, i;



  for (n = 0, i = val; i && n < sizeof(val); ++n)

    i >>= 8;



  i = n;

  while (i--) {

    buf[i] = val & 0xff;

    val >>= 8;

  }



  return n;

}