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coap_encode.c
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/* coap_encode.c -- encoding and decoding of CoAP data types
*
* Copyright (C) 2010-2024 Olaf Bergmann <bergmann@tzi.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* This file is part of the CoAP library libcoap. Please see
* README for terms of use.
*/
#include "coap3/coap_libcoap_build.h"
/* Carsten suggested this when fls() is not available: */
#ifndef HAVE_FLS
int
coap_fls(unsigned int i) {
return coap_flsll(i);
}
#endif
#ifndef HAVE_FLSLL
int
coap_flsll(long long j) {
unsigned long long i = (unsigned long long)j;
int n;
for (n = 0; i; n++)
i >>= 1;
return n;
}
#endif
unsigned int
coap_decode_var_bytes(const uint8_t *buf, size_t len) {
unsigned int i, n = 0;
for (i = 0; i < len; ++i)
n = (n << 8) + buf[i];
return n;
}
unsigned int
coap_encode_var_safe(uint8_t *buf, size_t length, unsigned int val) {
unsigned int n, i;
for (n = 0, i = val; i && n < sizeof(val); ++n)
i >>= 8;
if (n > length) {
assert(n <= length);
return 0;
}
i = n;
while (i--) {
buf[i] = val & 0xff;
val >>= 8;
}
return n;
}
uint64_t
coap_decode_var_bytes8(const uint8_t *buf, size_t len) {
unsigned int i;
uint64_t n = 0;
for (i = 0; i < len && i < sizeof(uint64_t); ++i)
n = (n << 8) + buf[i];
return n;
}
unsigned int
coap_encode_var_safe8(uint8_t *buf, size_t length, uint64_t val) {
unsigned int n, i;
uint64_t tval = val;
for (n = 0; tval && n < sizeof(val); ++n)
tval >>= 8;
if (n > length) {
assert(n <= length);
return 0;
}
i = n;
while (i--) {
buf[i] = val & 0xff;
val >>= 8;
}
return n;
}
coap_flsll
int coap_flsll(long long j)
Definition coap_encode.c:28
coap_fls
int coap_fls(unsigned int i)
Definition coap_encode.c:21
coap_libcoap_build.h
Library specific build wrapper for coap_internal.h.
coap_encode_var_safe
unsigned int coap_encode_var_safe(uint8_t *buf, size_t length, unsigned int val)
Encodes multiple-length byte sequences.
Definition coap_encode.c:47
coap_decode_var_bytes
unsigned int coap_decode_var_bytes(const uint8_t *buf, size_t len)
Decodes multiple-length byte sequences.
Definition coap_encode.c:38
coap_decode_var_bytes8
uint64_t coap_decode_var_bytes8(const uint8_t *buf, size_t len)
Decodes multiple-length byte sequences.
Definition coap_encode.c:67
coap_encode_var_safe8
unsigned int coap_encode_var_safe8(uint8_t *buf, size_t length, uint64_t val)
Encodes multiple-length byte sequences.
Definition coap_encode.c:77