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package chain
import (
"math/big"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/state"
)
func CreateBloom(block *Block) []byte {
bin := new(big.Int)
bin.Or(bin, bloom9(crypto.Sha3(block.Coinbase)))
for _, receipt := range block.Receipts() {
bin.Or(bin, LogsBloom(receipt.logs))
}
return ethutil.LeftPadBytes(bin.Bytes(), 64)
}
func LogsBloom(logs state.Logs) *big.Int {
bin := new(big.Int)
for _, log := range logs {
data := [][]byte{crypto.Sha3(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)
b := uint(b[i+1]) + 256*(uint(b[i])&1)
r.Or(r, t.Lsh(t, b))
}
return r
}
func BloomLookup(bin, topic []byte) bool {
bloom := ethutil.BigD(bin)
cmp := bloom9(topic)
return bloom.And(bloom, cmp).Cmp(cmp) == 0
}
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