From fa4337c3703e926cfd69c567a75030c9d2bc5e9d Mon Sep 17 00:00:00 2001
From: Vincent Batts <vbatts@hashbangbash.com>
Date: Sun, 16 Aug 2015 18:59:09 -0400
Subject: [PATCH] stream: reduce allocs in Reset()

improvement:
```
benchmark               old ns/op     new ns/op     delta
BenchmarkHash8Bytes     21137         12201         -42.28%
BenchmarkHash1K         27235         14842         -45.50%
BenchmarkHash8K         38630         29034         -24.84%

benchmark               old MB/s     new MB/s     speedup
BenchmarkHash8Bytes     0.38         0.66         1.74x
BenchmarkHash1K         37.60        68.99        1.83x
BenchmarkHash8K         212.06       282.15       1.33x

benchmark               old allocs     new allocs     delta
BenchmarkHash8Bytes     10             9              -10.00%
BenchmarkHash1K         10             9              -10.00%
BenchmarkHash8K         9              8              -11.11%

benchmark               old bytes     new bytes     delta
BenchmarkHash8Bytes     16712         8520          -49.02%
BenchmarkHash1K         17728         9536          -46.21%
BenchmarkHash8K         16704         8512          -49.04%
```
---
 stream.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/stream.go b/stream.go
index 068bb0c..68d18d1 100644
--- a/stream.go
+++ b/stream.go
@@ -49,8 +49,9 @@ type merkleHash struct {
 }
 
 func (mh *merkleHash) Reset() {
-	mh1 := newMerkleHash(mh.hm, mh.blockSize)
-	*mh = *mh1
+	mh.tree = &Tree{Nodes: []*Node{}, BlockLength: mh.blockSize}
+	mh.lastBlockLen = 0
+	mh.partialLastNode = false
 }
 
 func (mh merkleHash) Nodes() []*Node {