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package furgit
import (
"crypto/sha1"
"encoding/hex"
"fmt"
)
// To change the hash algorithm you probably only need to change these two lines...
const HashSize = sha1.Size
var newHash = sha1.Sum
// Hash represents a Git object identifier.
type Hash [HashSize]byte
// ParseHash converts a hex string into an Hash.
func ParseHash(s string) (Hash, error) {
var id Hash
if len(s) != HashSize*2 {
return id, fmt.Errorf("furgit: invalid hash length %d", len(s))
}
data, err := hex.DecodeString(s)
if err != nil {
return id, fmt.Errorf("furgit: decode hash: %w", err)
}
copy(id[:], data)
return id, nil
}
// String renders the ID as hex.
func (id Hash) String() string {
return hex.EncodeToString(id[:])
}
// Bytes returns a mutable copy of the underlying bytes.
func (id Hash) Bytes() []byte {
return append([]byte(nil), id[:]...)
}
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