path: root/core/types/bloom9.go

package types

import (
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/core/state"
)

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 common.Hash) bool {
    bloom := bin.Big()
    cmp := bloom9(topic[:])

    return bloom.And(bloom, cmp).Cmp(cmp) == 0
}