package ethchain import ( "math/big" "github.com/ethereum/go-ethereum/ethstate" "github.com/ethereum/go-ethereum/ethutil" ) func CreateBloom(block *Block) []byte { bin := new(big.Int) bin.Or(bin, bloom9(block.Coinbase)) for _, receipt := range block.Receipts() { bin.Or(bin, LogsBloom(receipt.logs)) } return bin.Bytes() } func LogsBloom(logs ethstate.Logs) *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 }