56 lines
974 B
Go
56 lines
974 B
Go
package ethchain
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum.backup/ethutil-go"
|
|
"github.com/ethereum/go-ethereum/vm"
|
|
)
|
|
|
|
func CreateBloom(block *Block) []byte {
|
|
bin := new(big.Int)
|
|
bin.Or(bin, bloom9(block.Coinbase))
|
|
for _, tx := range block.Transactions() {
|
|
bin.Or(bin, LogsBloom(tx.logs))
|
|
}
|
|
|
|
return bin.Bytes()
|
|
}
|
|
|
|
func LogsBloom(logs []vm.Log) *big.Int {
|
|
bin := new(big.Int)
|
|
for _, log := range logs {
|
|
data := [][]byte{log.Address}
|
|
for _, topic := range log.Topics {
|
|
data = append(data, topic)
|
|
}
|
|
|
|
if log.Data != nil {
|
|
data = append(data, log.Data)
|
|
}
|
|
|
|
for _, b := range data {
|
|
bin.Or(bin, bloom9(b))
|
|
}
|
|
}
|
|
|
|
return bin
|
|
}
|
|
|
|
func bloom9(b []byte) *big.Int {
|
|
r := new(big.Int)
|
|
for _, i := range []int{0, 2, 4} {
|
|
t := big.NewInt(1)
|
|
r.Or(r, t.Lsh(t, uint(b[i+1])+256*(uint(b[i])&1)))
|
|
}
|
|
|
|
return r
|
|
}
|
|
|
|
func BloomLookup(bin, topic []byte) bool {
|
|
bloom := ethutil.BigD(bin)
|
|
cmp := bloom9(topic)
|
|
|
|
return bloom.And(bloom, cmp).Cmp(cmp) == 0
|
|
}
|