1 files changed, 18 insertions, 4 deletions
diff --git a/util/fifo8.c b/util/fifo8.c
index 2eeed56e80..4e01b532d9 100644
--- a/util/fifo8.c
+++ b/util/fifo8.c
@@ -66,7 +66,8 @@ uint8_t fifo8_pop(Fifo8 *fifo)
     return ret;
 }
 
-const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
+static const uint8_t *fifo8_peekpop_buf(Fifo8 *fifo, uint32_t max,
+                                        uint32_t *numptr, bool do_pop)
 {
     uint8_t *ret;
     uint32_t num;
@@ -74,15 +75,28 @@ const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
     assert(max > 0 && max <= fifo->num);
     num = MIN(fifo->capacity - fifo->head, max);
     ret = &fifo->data[fifo->head];
-    fifo->head += num;
-    fifo->head %= fifo->capacity;
-    fifo->num -= num;
+
+    if (do_pop) {
+        fifo->head += num;
+        fifo->head %= fifo->capacity;
+        fifo->num -= num;
+    }
     if (numptr) {
         *numptr = num;
     }
     return ret;
 }
 
+const uint8_t *fifo8_peek_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
+{
+    return fifo8_peekpop_buf(fifo, max, numptr, false);
+}
+
+const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
+{
+    return fifo8_peekpop_buf(fifo, max, numptr, true);
+}
+
 void fifo8_reset(Fifo8 *fifo)
 {
     fifo->num = 0;