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util.go
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/
util.go
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package data
import (
"crypto/sha512"
)
const hextable = "0123456789ABCDEF"
//faster than fmt and need upper case!
func b2h(h []byte) []byte {
b := make([]byte, len(h)*2)
for i, v := range h {
b[i*2] = hextable[v>>4]
b[i*2+1] = hextable[v&0x0f]
}
return b
}
func min(a, b uint32) uint32 {
if a < b {
return a
}
return b
}
func max(a, b uint32) uint32 {
if a > b {
return a
}
return b
}
func min64(a, b uint64) uint64 {
if a < b {
return a
}
return b
}
func max64(a, b uint64) uint64 {
if a > b {
return a
}
return b
}
func abs(a int64) uint64 {
if a < 0 {
return uint64(-a)
}
return uint64(a)
}
func hashValues(values []interface{}) (Hash256, error) {
var hash Hash256
hasher := sha512.New()
for _, v := range values {
if err := write(hasher, v); err != nil {
return hash, err
}
}
copy(hash[:], hasher.Sum(nil))
return hash, nil
}