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fifo8: add skip parameter to fifo8_peekpop_bufptr()

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The skip parameter specifies the number of bytes to be skipped
from the current FIFO head before the peek or pop operation.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Octavian Purdila <tavip@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240828122258.928947-4-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Mark Cave-Ayland 2024-08-28 13:22:52 +01:00 • committed by Philippe Mathieu-Daudé
parent 0b73afec0e
commit e8b33243bb
1 changed files with 7 additions and 5 deletions
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12
util/fifo8.c
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@ -72,18 +72,20 @@ uint8_t fifo8_pop(Fifo8 *fifo)
} }
static const uint8_t *fifo8_peekpop_bufptr(Fifo8 *fifo, uint32_t max, static const uint8_t *fifo8_peekpop_bufptr(Fifo8 *fifo, uint32_t max,
uint32_t *numptr, bool do_pop) uint32_t skip, uint32_t *numptr,
bool do_pop)
{ {
uint8_t *ret; uint8_t *ret;
uint32_t num, head; uint32_t num, head;
assert(max > 0 && max <= fifo->num); assert(max > 0 && max <= fifo->num);
head = fifo->head; assert(skip <= fifo->num);
head = (fifo->head + skip) % fifo->capacity;
num = MIN(fifo->capacity - head, max); num = MIN(fifo->capacity - head, max);
ret = &fifo->data[head]; ret = &fifo->data[head];
if (do_pop) { if (do_pop) {
fifo->head += num; fifo->head = head + num;
fifo->head %= fifo->capacity; fifo->head %= fifo->capacity;
fifo->num -= num; fifo->num -= num;
} }
@ -95,12 +97,12 @@ static const uint8_t *fifo8_peekpop_bufptr(Fifo8 *fifo, uint32_t max,
const uint8_t *fifo8_peek_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr) const uint8_t *fifo8_peek_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
{ {
return fifo8_peekpop_bufptr(fifo, max, numptr, false); return fifo8_peekpop_bufptr(fifo, max, 0, numptr, false);
} }
const uint8_t *fifo8_pop_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr) const uint8_t *fifo8_pop_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
{ {
return fifo8_peekpop_bufptr(fifo, max, numptr, true); return fifo8_peekpop_bufptr(fifo, max, 0, numptr, true);
} }
uint32_t fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen) uint32_t fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen)