1 files changed, 42 insertions, 0 deletions
diff --git a/core/state/sync.go b/core/state/sync.go
new file mode 100644
index 0000000..873395c
--- /dev/null
+++ b/core/state/sync.go
@@ -0,0 +1,42 @@
+// Copyright 2015 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 state
+
+import (
+	"bytes"
+
+	"github.com/ava-labs/go-ethereum/common"
+	"github.com/ava-labs/go-ethereum/ethdb"
+	"github.com/ava-labs/go-ethereum/rlp"
+	"github.com/ava-labs/go-ethereum/trie"
+)
+
+// NewStateSync create a new state trie download scheduler.
+func NewStateSync(root common.Hash, database ethdb.KeyValueReader, bloom *trie.SyncBloom) *trie.Sync {
+	var syncer *trie.Sync
+	callback := func(leaf []byte, parent common.Hash) error {
+		var obj Account
+		if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
+			return err
+		}
+		syncer.AddSubTrie(obj.Root, 64, parent, nil)
+		syncer.AddRawEntry(common.BytesToHash(obj.CodeHash), 64, parent)
+		return nil
+	}
+	syncer = trie.NewSync(root, database, callback, bloom)
+	return syncer
+}