makeHasher¶
| Source (upstream pre-purge) | Current | |
|---|---|---|
| File | consensus/ethash/algorithm.go |
algorithm.go |
| Symbol | makeHasher |
makeHasher |
| Ref | dde2da0ef~1 |
etc/v1.17.3-full-node |
3-way merge — purge → getc ← upstream¶
pre-purge
↗// makeHasher creates a repetitive hasher, allowing the same hash data structures to
// be reused between hash runs instead of requiring new ones to be created. The returned
// function is not thread safe!
func makeHasher(h hash.Hash) hasher {
// sha3.state supports Read to get the sum, use it to avoid the overhead of Sum.
// Read alters the state but we reset the hash before every operation.
type readerHash interface {
hash.Hash
Read([]byte) (int, error)
}
rh, ok := h.(readerHash)
if !ok {
panic("can't find Read method on hash")
}
outputLen := rh.Size()
return func(dest []byte, data []byte) {
rh.Reset()
rh.Write(data)
rh.Read(dest[:outputLen])
}
}