Add 'lib/protocol/' from commit 'f91191218b192ace841c878f161832d19c09145a'

git-subtree-dir: lib/protocol
git-subtree-mainline: 5ecb8bdd8a
git-subtree-split: f91191218b

lib/protocol/vector_xdr.go

@@ -0,0 +1,43 @@
+// Copyright (C) 2015 The Protocol Authors.
+
+package protocol
+
+import "github.com/calmh/xdr"
+
+// This stuff is hacked up manually because genxdr doesn't support 'type
+// Vector []Counter' declarations and it was tricky when I tried to add it...
+
+type xdrWriter interface {
+	WriteUint32(uint32) (int, error)
+	WriteUint64(uint64) (int, error)
+}
+type xdrReader interface {
+	ReadUint32() uint32
+	ReadUint64() uint64
+}
+
+// EncodeXDRInto encodes the vector as an XDR object into the given XDR
+// encoder.
+func (v Vector) EncodeXDRInto(w xdrWriter) (int, error) {
+	w.WriteUint32(uint32(len(v)))
+	for i := range v {
+		w.WriteUint64(v[i].ID)
+		w.WriteUint64(v[i].Value)
+	}
+	return 4 + 16*len(v), nil
+}
+
+// DecodeXDRFrom decodes the XDR objects from the given reader into itself.
+func (v *Vector) DecodeXDRFrom(r xdrReader) error {
+	l := int(r.ReadUint32())
+	if l > 1e6 {
+		return xdr.ElementSizeExceeded("number of counters", l, 1e6)
+	}
+	n := make(Vector, l)
+	for i := range n {
+		n[i].ID = r.ReadUint64()
+		n[i].Value = r.ReadUint64()
+	}
+	*v = n
+	return nil
+}