ethchain/bloom9.go


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

package ethchain

import "github.com/ethereum/go-ethereum/vm"

func CreateBloom(txs Transactions) uint64 {
    var bin uint64
    for _, tx := range txs {
        bin |= logsBloom(tx.logs)
    }

    return bin
}

func logsBloom(logs []vm.Log) uint64 {
    var bin uint64
    for _, log := range logs {
        data := []byte{log.Address}
        for _, topic := range log.Topics {
            data = append(data, topic.Bytes())
        }
        data = append(data, log.Data)

        for _, b := range data {
            bin |= bloom9(b)
        }
    }

    return bin
}

func bloom9(b []byte) uint64 {
    var r uint64
    for _, i := range []int{0, 2, 4} {
        r |= 1 << (b[i+1] + 256*(b[i]&1))
    }

    return r
}