core/types/bloom9.go


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package types

import (
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/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())+1)
        data[0] = log.Address().Hash()

        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
}