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

@@ -0,0 +1,70 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+type queue[T any] struct {
+	buf   []T
+	head  int
+	tail  int
+	count int
+}
+
+const minCap = 16
+
+func newQueue[T any](capacity int) *queue[T] {
+	queueCap := minCap
+	for queueCap < capacity {
+		queueCap <<= 1
+	}
+
+	return &queue[T]{
+		buf: make([]T, queueCap),
+	}
+}
+
+func (q *queue[T]) Len() int {
+	return q.count
+}
+
+func (q *queue[T]) PushBack(ele T) {
+	q.growIfFull()
+	q.buf[q.tail] = ele
+	q.tail = (q.tail + 1) % len(q.buf)
+	q.count++
+}
+
+func (q *queue[T]) PopFront() T {
+	ele := q.buf[q.head]
+	var zeroVal T
+	q.buf[q.head] = zeroVal
+	q.head = (q.head + 1) % len(q.buf)
+	q.count--
+	return ele
+}
+
+func (q *queue[T]) Front() T {
+	return q.buf[q.head]
+}
+
+func (q *queue[T]) At(i int) T {
+	return q.buf[(q.head+i)%(len(q.buf))]
+}
+
+func (q *queue[T]) growIfFull() {
+	if q.count < len(q.buf) {
+		return
+	}
+
+	newBuf := make([]T, q.count<<1)
+	if q.tail > q.head {
+		copy(newBuf, q.buf[q.head:q.tail])
+	} else {
+		n := copy(newBuf, q.buf[q.head:])
+		copy(newBuf[n:], q.buf[:q.tail])
+	}
+
+	q.head = 0
+	q.tail = q.count
+	q.buf = newBuf
+}