/
bloom9.go
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/
bloom9.go
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// Copyright 2014 The go-ethereum Authors
// This file is part of Ngin.
//
// Ngin 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.
//
// Ngin 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 Ngin. If not, see <http://www.gnu.org/licenses/>.
package types
import (
"fmt"
"math/big"
"github.com/NginProject/ngind/common"
"github.com/NginProject/ngind/core/vm"
"github.com/NginProject/ngind/crypto"
)
const bloomLength = 256
type Bloom [bloomLength]byte
func BytesToBloom(b []byte) Bloom {
var bloom Bloom
bloom.SetBytes(b)
return bloom
}
func (b *Bloom) SetBytes(d []byte) {
if len(b) < len(d) {
panic(fmt.Sprintf("bloom bytes too big %d %d", len(b), len(d)))
}
copy(b[bloomLength-len(d):], d)
}
func (b *Bloom) Add(d *big.Int) {
bin := new(big.Int).SetBytes(b[:])
bin.Or(bin, bloom9(d.Bytes()))
b.SetBytes(bin.Bytes())
}
func (b Bloom) Bytes() []byte {
return b[:]
}
func (b Bloom) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%#x"`, b.Bytes())), nil
}
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 vm.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.Keccak256(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 []byte) bool {
bloom := new(big.Int).SetBytes(bin[:])
cmp := bloom9(topic)
return bloom.And(bloom, cmp).Cmp(cmp) == 0
}