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core/forkid: refactor nextForkHash #1177

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merged 1 commit into from
Nov 17, 2022
Merged

core/forkid: refactor nextForkHash #1177

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20 changes: 7 additions & 13 deletions core/forkid/forkid.go
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Original file line number Diff line number Diff line change
Expand Up @@ -84,26 +84,20 @@ func NewID(config *params.ChainConfig, genesis common.Hash, head uint64) ID {
return ID{Hash: checksumToBytes(hash), Next: next}
}

//NextForkHash calculates the forkHash from genesis to the next fork block number
func NextForkHash(config *params.ChainConfig, genesis common.Hash, head uint64) [4]byte {
// Calculate the starting checksum from the genesis hash
hash := crc32.ChecksumIEEE(genesis[:])

// Calculate the current fork checksum and the next fork block
var next uint64
for _, fork := range gatherForks(config) {
if fork <= head {
// Fork already passed, checksum the previous hash and the fork number
hash = checksumUpdate(hash, fork)
continue
if fork > head {
// Checksum the previous hash and nextFokr number and return
return checksumToBytes(checksumUpdate(hash, fork))
}
next = fork
break
}
if next == 0 {
return checksumToBytes(hash)
} else {
return checksumToBytes(checksumUpdate(hash, next))
// Fork already passed, checksum the previous hash and the fork number
hash = checksumUpdate(hash, fork)
}
return checksumToBytes(hash)
}

// NewIDWithChain calculates the Ethereum fork ID from an existing chain instance.
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