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-rw-r--r--util/fifo8.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/util/fifo8.c b/util/fifo8.c
index 013e903c6e..6a43482c9e 100644
--- a/util/fifo8.c
+++ b/util/fifo8.c
@@ -37,6 +37,27 @@ void fifo8_push(Fifo8 *fifo, uint8_t data)
fifo->num++;
}
+void fifo8_push_all(Fifo8 *fifo, const uint8_t *data, uint32_t num)
+{
+ uint32_t start, avail;
+
+ if (fifo->num + num > fifo->capacity) {
+ abort();
+ }
+
+ start = (fifo->head + fifo->num) % fifo->capacity;
+
+ if (start + num <= fifo->capacity) {
+ memcpy(&fifo->data[start], data, num);
+ } else {
+ avail = fifo->capacity - start;
+ memcpy(&fifo->data[start], data, avail);
+ memcpy(&fifo->data[0], &data[avail], num - avail);
+ }
+
+ fifo->num += num;
+}
+
uint8_t fifo8_pop(Fifo8 *fifo)
{
uint8_t ret;
@@ -50,9 +71,25 @@ uint8_t fifo8_pop(Fifo8 *fifo)
return ret;
}
+const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *num)
+{
+ uint8_t *ret;
+
+ if (max == 0 || max > fifo->num) {
+ abort();
+ }
+ *num = MIN(fifo->capacity - fifo->head, max);
+ ret = &fifo->data[fifo->head];
+ fifo->head += *num;
+ fifo->head %= fifo->capacity;
+ fifo->num -= *num;
+ return ret;
+}
+
void fifo8_reset(Fifo8 *fifo)
{
fifo->num = 0;
+ fifo->head = 0;
}
bool fifo8_is_empty(Fifo8 *fifo)
@@ -65,6 +102,16 @@ bool fifo8_is_full(Fifo8 *fifo)
return (fifo->num == fifo->capacity);
}
+uint32_t fifo8_num_free(Fifo8 *fifo)
+{
+ return fifo->capacity - fifo->num;
+}
+
+uint32_t fifo8_num_used(Fifo8 *fifo)
+{
+ return fifo->num;
+}
+
const VMStateDescription vmstate_fifo8 = {
.name = "Fifo8",
.version_id = 1,