From 73f4ee623b335b363b3d155870c6e9aa0a00ddef Mon Sep 17 00:00:00 2001
From: Dave Collins <davec@conformal.com>
Date: Wed, 6 Nov 2013 07:37:34 -0600
Subject: [PATCH] Optimize readOutPoint.

Before: BenchmarkReadOutPoint     500000              2946 ns/op
After:  BenchmarkReadOutPoint    5000000               582 ns/op

This is part ef the ongoing effort to optimize serialization as noted in
conformal/btcd#27.
---
 msgtx.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/msgtx.go b/msgtx.go
index 7c941455..891bb5da 100644
--- a/msgtx.go
+++ b/msgtx.go
@@ -417,10 +417,17 @@ func NewMsgTx() *MsgTx {
 
 // readOutPoint reads the next sequence of bytes from r as an OutPoint.
 func readOutPoint(r io.Reader, pver uint32, version uint32, op *OutPoint) error {
-	err := readElements(r, &op.Hash, &op.Index)
+	_, err := io.ReadFull(r, op.Hash[:])
 	if err != nil {
 		return err
 	}
+
+	buf := make([]byte, 4)
+	_, err = io.ReadFull(r, buf)
+	if err != nil {
+		return err
+	}
+	op.Index = binary.LittleEndian.Uint32(buf)
 	return nil
 }