添加 github.com/pion/dtls 代码

dtls-2.0.9/internal/util/util.go

@@ -0,0 +1,39 @@
+// Package util contains small helpers used across the repo
+package util
+
+import (
+	"encoding/binary"
+)
+
+// BigEndianUint24 returns the value of a big endian uint24
+func BigEndianUint24(raw []byte) uint32 {
+	if len(raw) < 3 {
+		return 0
+	}
+
+	rawCopy := make([]byte, 4)
+	copy(rawCopy[1:], raw)
+	return binary.BigEndian.Uint32(rawCopy)
+}
+
+// PutBigEndianUint24 encodes a uint24 and places into out
+func PutBigEndianUint24(out []byte, in uint32) {
+	tmp := make([]byte, 4)
+	binary.BigEndian.PutUint32(tmp, in)
+	copy(out, tmp[1:])
+}
+
+// PutBigEndianUint48 encodes a uint64 and places into out
+func PutBigEndianUint48(out []byte, in uint64) {
+	tmp := make([]byte, 8)
+	binary.BigEndian.PutUint64(tmp, in)
+	copy(out, tmp[2:])
+}
+
+// Max returns the larger value
+func Max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}