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package core
import (
"crypto/sha1"
"encoding/hex"
"strconv"
)
// Hash SHA1 hased content
type Hash [20]byte
// ZeroHash is Hash with value zero
var ZeroHash Hash
// ComputeHash compute the hash for a given ObjectType and content
func ComputeHash(t ObjectType, content []byte) Hash {
h := t.Bytes()
h = append(h, ' ')
h = strconv.AppendInt(h, int64(len(content)), 10)
h = append(h, 0)
h = append(h, content...)
return Hash(sha1.Sum(h))
}
// NewHash return a new Hash from a hexadecimal hash representation
func NewHash(s string) Hash {
b, _ := hex.DecodeString(s)
var h Hash
copy(h[:], b)
return h
}
func (h Hash) IsZero() bool {
var empty Hash
return h == empty
}
func (h Hash) String() string {
return hex.EncodeToString(h[:])
}
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