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bloom9.go
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bloom9.go
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package types
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/crypto"
)
type bytesBacked interface {
Bytes() []byte
}
func CreateBloom(receipts Receipts) Bloom {
bin := new(big.Int)
for _, receipt := range receipts {
bin.Or(bin, LogsBloom(receipt.logs))
}
return BytesToBloom(bin.Bytes())
}
func LogsBloom(logs state.Logs) *big.Int {
bin := new(big.Int)
for _, log := range logs {
data := make([]common.Hash, len(log.Topics))
bin.Or(bin, bloom9(log.Address.Bytes()))
for i, topic := range log.Topics {
data[i] = topic
}
for _, b := range data {
bin.Or(bin, bloom9(b[:]))
}
}
return bin
}
func bloom9(b []byte) *big.Int {
b = crypto.Sha3(b[:])
r := new(big.Int)
for i := 0; i < 6; i += 2 {
t := big.NewInt(1)
b := (uint(b[i+1]) + (uint(b[i]) << 8)) & 2047
r.Or(r, t.Lsh(t, b))
}
return r
}
var Bloom9 = bloom9
func BloomLookup(bin Bloom, topic bytesBacked) bool {
bloom := bin.Big()
cmp := bloom9(topic.Bytes()[:])
return bloom.And(bloom, cmp).Cmp(cmp) == 0
}