From 1a1f93865f7bda02f26811fdf18a94ec889cfb31 Mon Sep 17 00:00:00 2001
From: Dave Collins <davec@conformal.com>
Date: Wed, 6 Nov 2013 16:38:51 -0600
Subject: [PATCH] Optimize writeTxIn.

Before: BenchmarkWriteTxIn       5000000               422 ns/op
After:  BenchmarkWriteTxIn       5000000               389 ns/op

This is part of the ongoing effort to optimize serialization as noted in
conformal/btcd#27.
---
 msgtx.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/msgtx.go b/msgtx.go
index 2e989fb2..182fb7eb 100644
--- a/msgtx.go
+++ b/msgtx.go
@@ -504,13 +504,14 @@ func writeTxIn(w io.Writer, pver uint32, version uint32, ti *TxIn) error {
 		return err
 	}
 
-	b := []byte(ti.SignatureScript)
-	_, err = w.Write(b)
+	_, err = w.Write(ti.SignatureScript)
 	if err != nil {
 		return err
 	}
 
-	err = writeElement(w, &ti.Sequence)
+	buf := make([]byte, 4)
+	binary.LittleEndian.PutUint32(buf, ti.Sequence)
+	_, err = w.Write(buf)
 	if err != nil {
 		return err
 	}