58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
package chain
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/state"
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)
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func CreateBloom(block *Block) []byte {
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bin := new(big.Int)
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bin.Or(bin, bloom9(crypto.Sha3(block.Coinbase)))
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for _, receipt := range block.Receipts() {
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bin.Or(bin, LogsBloom(receipt.logs))
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}
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return ethutil.LeftPadBytes(bin.Bytes(), 64)
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}
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func LogsBloom(logs state.Logs) *big.Int {
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bin := new(big.Int)
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for _, log := range logs {
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data := [][]byte{crypto.Sha3(log.Address)}
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for _, topic := range log.Topics {
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data = append(data, topic)
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}
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if log.Data != nil {
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data = append(data, log.Data)
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}
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for _, b := range data {
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bin.Or(bin, bloom9(b))
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}
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}
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return bin
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}
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func bloom9(b []byte) *big.Int {
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r := new(big.Int)
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for _, i := range []int{0, 2, 4} {
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t := big.NewInt(1)
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b := uint(b[i+1]) + 256*(uint(b[i])&1)
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r.Or(r, t.Lsh(t, b))
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}
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return r
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}
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func BloomLookup(bin, topic []byte) bool {
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bloom := ethutil.BigD(bin)
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cmp := bloom9(topic)
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return bloom.And(bloom, cmp).Cmp(cmp) == 0
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}
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