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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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
}
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