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net/nanocoap: optimize determination of exponent for block szx

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This commit is contained in:
Ken Bannister 2019-09-30 08:15:21 -04:00
parent e22d4729e1
commit 2dc4209c0e
1 changed files with 8 additions and 8 deletions
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16
sys/net/application_layer/nanocoap/nanocoap.c
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@ -26,6 +26,7 @@
#include <stdio.h>
#include <string.h>
#include "bitarithm.h"
#include "net/nanocoap.h"
#define ENABLE_DEBUG (0)
@ -655,16 +656,15 @@ size_t coap_put_option(uint8_t *buf, uint16_t lastonum, uint16_t onum, const uin
static unsigned _size2szx(size_t size)
{
unsigned szx = 0;
assert(size <= 1024);
while (size) {
size = size >> 1;
szx++;
}
/* Size exponent + 1 */
assert(szx >= 5);
return szx - 5;
/* We must wait to subract the szx offset of 4 until after the assert below.
* Input should be a power of two, but if not it may have a stray low order
* '1' bit that would invalidate the subtraction. */
unsigned szx = bitarithm_lsb(size);
assert(szx >= 4);
return szx - 4;
}
static unsigned _slicer2blkopt(coap_block_slicer_t *slicer, bool more)