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-rw-r--r--core/state/snapshot/account.go86
1 files changed, 86 insertions, 0 deletions
diff --git a/core/state/snapshot/account.go b/core/state/snapshot/account.go
new file mode 100644
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+++ b/core/state/snapshot/account.go
@@ -0,0 +1,86 @@
+// Copyright 2019 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 snapshot
+
+import (
+ "bytes"
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/rlp"
+)
+
+// Account is a modified version of a state.Account, where the root is replaced
+// with a byte slice. This format can be used to represent full-consensus format
+// or slim-snapshot format which replaces the empty root and code hash as nil
+// byte slice.
+type Account struct {
+ Nonce uint64
+ Balance *big.Int
+ Root []byte
+ CodeHash []byte
+}
+
+// SlimAccount converts a state.Account content into a slim snapshot account
+func SlimAccount(nonce uint64, balance *big.Int, root common.Hash, codehash []byte) Account {
+ slim := Account{
+ Nonce: nonce,
+ Balance: balance,
+ }
+ if root != emptyRoot {
+ slim.Root = root[:]
+ }
+ if !bytes.Equal(codehash, emptyCode[:]) {
+ slim.CodeHash = codehash
+ }
+ return slim
+}
+
+// SlimAccountRLP converts a state.Account content into a slim snapshot
+// version RLP encoded.
+func SlimAccountRLP(nonce uint64, balance *big.Int, root common.Hash, codehash []byte) []byte {
+ data, err := rlp.EncodeToBytes(SlimAccount(nonce, balance, root, codehash))
+ if err != nil {
+ panic(err)
+ }
+ return data
+}
+
+// FullAccount decodes the data on the 'slim RLP' format and return
+// the consensus format account.
+func FullAccount(data []byte) (Account, error) {
+ var account Account
+ if err := rlp.DecodeBytes(data, &account); err != nil {
+ return Account{}, err
+ }
+ if len(account.Root) == 0 {
+ account.Root = emptyRoot[:]
+ }
+ if len(account.CodeHash) == 0 {
+ account.CodeHash = emptyCode[:]
+ }
+ return account, nil
+}
+
+// FullAccountRLP converts data on the 'slim RLP' format into the full RLP-format.
+func FullAccountRLP(data []byte) ([]byte, error) {
+ account, err := FullAccount(data)
+ if err != nil {
+ return nil, err
+ }
+ return rlp.EncodeToBytes(account)
+}