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server/vendor/github.com/pion/sctp/payload_queue.go

@@ -0,0 +1,73 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+type payloadQueue struct {
+	chunks *queue[*chunkPayloadData]
+	nBytes int
+}
+
+func newPayloadQueue() *payloadQueue {
+	return &payloadQueue{chunks: newQueue[*chunkPayloadData](128)}
+}
+
+func (q *payloadQueue) pushNoCheck(p *chunkPayloadData) {
+	q.chunks.PushBack(p)
+	q.nBytes += len(p.userData)
+}
+
+// pop pops only if the oldest chunk's TSN matches the given TSN.
+func (q *payloadQueue) pop(tsn uint32) (*chunkPayloadData, bool) {
+	if q.chunks.Len() > 0 && tsn == q.chunks.Front().tsn {
+		c := q.chunks.PopFront()
+		q.nBytes -= len(c.userData)
+		return c, true
+	}
+
+	return nil, false
+}
+
+// get returns reference to chunkPayloadData with the given TSN value.
+func (q *payloadQueue) get(tsn uint32) (*chunkPayloadData, bool) {
+	length := q.chunks.Len()
+	if length == 0 {
+		return nil, false
+	}
+	head := q.chunks.Front().tsn
+	if tsn < head || int(tsn-head) >= length {
+		return nil, false
+	}
+	return q.chunks.At(int(tsn - head)), true
+}
+
+func (q *payloadQueue) markAsAcked(tsn uint32) int {
+	var nBytesAcked int
+	if c, ok := q.get(tsn); ok {
+		c.acked = true
+		c.retransmit = false
+		nBytesAcked = len(c.userData)
+		q.nBytes -= nBytesAcked
+		c.userData = []byte{}
+	}
+
+	return nBytesAcked
+}
+
+func (q *payloadQueue) markAllToRetrasmit() {
+	for i := 0; i < q.chunks.Len(); i++ {
+		c := q.chunks.At(i)
+		if c.acked || c.abandoned() {
+			continue
+		}
+		c.retransmit = true
+	}
+}
+
+func (q *payloadQueue) getNumBytes() int {
+	return q.nBytes
+}
+
+func (q *payloadQueue) size() int {
+	return q.chunks.Len()
+}