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47 lines
881 B
C
47 lines
881 B
C
/* encode.c -- encoding and decoding of CoAP data types
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*
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* Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>
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*
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* This file is part of the CoAP library libcoap. Please see
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* README for terms of use.
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*/
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#ifndef NDEBUG
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# include <stdio.h>
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#endif
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#include "config.h"
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#include "encode.h"
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/* Carsten suggested this when fls() is not available: */
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int coap_fls(unsigned int i) {
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int n;
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for (n = 0; i; n++)
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i >>= 1;
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return n;
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}
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unsigned int
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coap_decode_var_bytes(unsigned char *buf,unsigned int len) {
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unsigned int i, n = 0;
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for (i = 0; i < len; ++i)
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n = (n << 8) + buf[i];
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return n;
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}
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unsigned int
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coap_encode_var_bytes(unsigned char *buf, unsigned int val) {
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int n, i = val >> 1;
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for (n = 0; i; n++) /* FIXME: coap_fls() */
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i >>= 1;
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for (i = n / 8 + 1; i; --i) {
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buf[i-1] = val & 0xff;
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val >>= 8;
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}
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return n / 8 + 1;
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}
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