From 187355448a21cb3c644091a716892888c54845c7 Mon Sep 17 00:00:00 2001
From: David Hill <dhill@mindcry.org>
Date: Wed, 16 Nov 2016 11:04:47 -0500
Subject: [PATCH] wire: reduce allocs in BlockHash()
---
wire/blockheader.go | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/wire/blockheader.go b/wire/blockheader.go
index 39859cd7..ba67ee48 100644
--- a/wire/blockheader.go
+++ b/wire/blockheader.go
@@ -53,8 +53,8 @@ func (h *BlockHeader) BlockHash() chainhash.Hash {
// transactions. Ignore the error returns since there is no way the
// encode could fail except being out of memory which would cause a
// run-time panic.
- var buf bytes.Buffer
- _ = writeBlockHeader(&buf, 0, h)
+ buf := bytes.NewBuffer(make([]byte, 0, MaxBlockHeaderPayload))
+ _ = writeBlockHeader(buf, 0, h)
return chainhash.DoubleHashH(buf.Bytes())
}