NAME¶

rq_pid2sbn, rq_pid2esi, rq_pidsetsbn, rq_pidsetesi - get/set SBN,ESI in rq_pid_t

SYNOPSIS¶

#include <lcrq.h>

uint8_t rq_pid2sbn(rq_pid_t pid);
uint32_t rq_pid2esi(rq_pid_t pid);
rq_pid_t rq_pidsetsbn(rq_pid_t pid, uint8_t sbn);
rq_pid_t rq_pidsetesi(rq_pid_t pid, uint32_t esi);

Compile and link with -llcrq.

DESCRIPTION¶

Bitshifting macros for getting and setting the SBN and ESI bits of rq_pid_t.

0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     SBN       |               Encoding Symbol ID              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

SBN (Source Block Number) is an 8 bit unsigned integer. The Encoding Symbol ID (ESI) is a 24 bit unsigned integer in network byte order.

RETURN VALUE¶

rq_pid2sbn() and rq_pid2esi() return the uint8_t SBN and uint32_t ESI numbers respectively. rq_pidsetsbn() and rq_pidsetesi() both return rq_pid_t with the appropriate bits set.

ERRORS¶

These macros do not return errors.

EXAMPLE¶

#include <assert.h>
#include <lcrq.h>
int main(void)
{
	rq_pid_t pid = 0;
	uint32_t esi = 19;
	uint8_t sbn = 42;
	/* set SBN and ESI bits */
	pid = rq_pidsetsbn(pid, sbn);
	pid = rq_pidsetesi(pid, esi);
	/* make sure we can read them back */
	assert(sbn == rq_pid2sbn(pid));
	assert(esi == rq_pid2esi(pid));
	return 0;
}

SEE ALSO¶

rq_init(3), rq_free(3), rq_decode(3), rq_encode(3), rq_symbol(3), lcrq(7)