package ethchain import ( "math/big" "github.com/ethereum/go-ethereum/vm" ) func CreateBloom(txs Transactions) []byte { bin := new(big.Int) for _, tx := range txs { 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) } 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 |= 1 << (uint64(b[i+1]) + 256*(uint64(b[i])&1)) r.Or(r, t.Rsh(t, uint(b[i+1])+256*(uint(b[i])&1))) } return r }