From d558a595adf4e89bab5b28ffde1448dc1e5768b0 Mon Sep 17 00:00:00 2001
From: Zahoor Mohamed <zahoor@zahoor.in>
Date: Fri, 22 Sep 2017 01:52:51 +0530
Subject: swarm/storage: pyramid chunker re-write (#14382)

---
 swarm/storage/swarmhasher.go | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 swarm/storage/swarmhasher.go

(limited to 'swarm/storage/swarmhasher.go')

diff --git a/swarm/storage/swarmhasher.go b/swarm/storage/swarmhasher.go
new file mode 100644
index 000000000..38b86373c
--- /dev/null
+++ b/swarm/storage/swarmhasher.go
@@ -0,0 +1,40 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package storage
+
+import (
+	"hash"
+)
+
+const (
+	BMTHash  = "BMT"
+	SHA3Hash = "SHA3" // http://golang.org/pkg/hash/#Hash
+)
+
+type SwarmHash interface {
+	hash.Hash
+	ResetWithLength([]byte)
+}
+
+type HashWithLength struct {
+	hash.Hash
+}
+
+func (self *HashWithLength) ResetWithLength(length []byte) {
+	self.Reset()
+	self.Write(length)
+}
-- 
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