Fix nix builds: go dependencies are awful

netforward/buffer.go

@@ -0,0 +1,27 @@
+// From https://github.com/goburrow/netforward
+package netforward
+
+import "sync"
+
+const (
+	bufferSize = 32 * 1024
+)
+
+var (
+	bufferPool = sync.Pool{
+		New: func() interface{} {
+			return make([]byte, bufferSize)
+		},
+	}
+)
+
+func getBuffer() []byte {
+	return bufferPool.Get().([]byte)
+}
+
+func releaseBuffer(b []byte) {
+	if len(b) != bufferSize {
+		panic("attempted to release buffer with invalid length")
+	}
+	bufferPool.Put(b)
+}