1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
package core
import (
"bytes"
"encoding/json"
"fmt"
verify "github.com/axtloss/fsverify/core"
bolt "go.etcd.io/bbolt"
)
var TotalReadBlocks = 0
func ReadBlock(start int, end int, device *bytes.Reader) ([]byte, error) {
block := make([]byte, end-start)
_, err := device.Seek(int64(start), 0)
if err != nil {
return []byte{}, err
}
_, err = device.Read(block)
TotalReadBlocks = TotalReadBlocks + (end - start)
return block, err
}
func CreateNode(blockStart int, blockEnd int, block []byte, prevNode *verify.Node) (verify.Node, error) {
node := verify.Node{}
node.BlockStart = blockStart
node.BlockEnd = blockEnd
blockHash, err := CalculateBlockHash(block)
if err != nil {
return verify.Node{}, err
}
node.BlockSum = blockHash
var prevNodeHash string
if prevNode.PrevNodeSum != "" {
prevNodeHash, err = prevNode.GetHash()
if err != nil {
return verify.Node{}, err
}
} else {
prevNodeHash = "Entrypoint"
}
node.PrevNodeSum = prevNodeHash
return node, nil
}
func AddNode(node verify.Node, db *bolt.DB, dbPath string) error {
var err error
var deferDB bool
if db == nil {
db, err = bolt.Open(dbPath, 0777, nil)
if err != nil {
return err
}
deferDB = true
} else if db.IsReadOnly() {
return fmt.Errorf("Error: database is opened read only, unable to add nodes")
}
err = db.Update(func(tx *bolt.Tx) error {
nodes, err := tx.CreateBucketIfNotExists([]byte("Nodes"))
if err != nil {
return err
}
if buf, err := json.Marshal(node); err != nil {
return err
} else if err := nodes.Put([]byte(node.PrevNodeSum), buf); err != nil {
return err
}
return nil
})
if deferDB {
defer db.Close()
}
return err
}
|
