ethchain/bloom9.go


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package ethchain

import "github.com/ethereum/go-ethereum/vm"

func CreateBloom(txs Transactions) uint64 {
    var bin uint64
    for _, tx := range txs {
        bin |= logsBloom(tx.logs)
    }

    return bin
}

func logsBloom(logs []vm.Log) uint64 {
    var bin uint64
    for _, log := range logs {
        data := [][]byte{log.Address}
        for _, topic := range log.Topics {
            data = append(data, topic.Bytes())
        }
        data = append(data, log.Data)

        for _, b := range data {
            bin |= bloom9(b)
        }
    }

    return bin
}

func bloom9(b []byte) uint64 {
    var r uint64
    for _, i := range []int{0, 2, 4} {
        r |= 1 << (uint64(b[i+1]) + 256*(uint64(b[i])&1))
    }

    return r
}