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package types
import (
"math/big"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/state"
)
func CreateBloom(receipts Receipts) []byte {
bin := new(big.Int)
for _, receipt := range receipts {
bin.Or(bin, LogsBloom(receipt.logs))
}
return common.LeftPadBytes(bin.Bytes(), 256)
}
func LogsBloom(logs state.Logs) *big.Int {
bin := new(big.Int)
for _, log := range logs {
data := make([][]byte, len(log.Topics())+1)
data[0] = log.Address()
for i, topic := range log.Topics() {
data[i+1] = topic
}
for _, b := range data {
bin.Or(bin, common.BigD(bloom9(crypto.Sha3(b)).Bytes()))
}
}
return bin
}
func bloom9(b []byte) *big.Int {
r := new(big.Int)
for i := 0; i < 16; i += 2 {
t := big.NewInt(1)
b := uint(b[i+1]) + 1024*(uint(b[i])&1)
r.Or(r, t.Lsh(t, b))
}
return r
}
func BloomLookup(bin, topic []byte) bool {
bloom := common.BigD(bin)
cmp := bloom9(crypto.Sha3(topic))
return bloom.And(bloom, cmp).Cmp(cmp) == 0
}
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