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

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+const (
+	paddingMultiple = 4
+)
+
+func getPadding(l int) int {
+	return (paddingMultiple - (l % paddingMultiple)) % paddingMultiple
+}
+
+func padByte(in []byte, cnt int) []byte {
+	if cnt < 0 {
+		cnt = 0
+	}
+	padding := make([]byte, cnt)
+	return append(in, padding...)
+}
+
+// Serial Number Arithmetic (RFC 1982)
+func sna32LT(i1, i2 uint32) bool {
+	return (i1 < i2 && i2-i1 < 1<<31) || (i1 > i2 && i1-i2 > 1<<31)
+}
+
+func sna32LTE(i1, i2 uint32) bool {
+	return i1 == i2 || sna32LT(i1, i2)
+}
+
+func sna32GT(i1, i2 uint32) bool {
+	return (i1 < i2 && (i2-i1) >= 1<<31) || (i1 > i2 && (i1-i2) <= 1<<31)
+}
+
+func sna32GTE(i1, i2 uint32) bool {
+	return i1 == i2 || sna32GT(i1, i2)
+}
+
+func sna32EQ(i1, i2 uint32) bool {
+	return i1 == i2
+}
+
+func sna16LT(i1, i2 uint16) bool {
+	return (i1 < i2 && (i2-i1) < 1<<15) || (i1 > i2 && (i1-i2) > 1<<15)
+}
+
+func sna16LTE(i1, i2 uint16) bool {
+	return i1 == i2 || sna16LT(i1, i2)
+}
+
+func sna16GT(i1, i2 uint16) bool {
+	return (i1 < i2 && (i2-i1) >= 1<<15) || (i1 > i2 && (i1-i2) <= 1<<15)
+}
+
+func sna16GTE(i1, i2 uint16) bool {
+	return i1 == i2 || sna16GT(i1, i2)
+}
+
+func sna16EQ(i1, i2 uint16) bool {
+	return i1 == i2
+}