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package id
import "hash"
// EmptyTree returns the object ID of
// an empty tree ("tree 0\x00")
// for this algorithm.
func (algo Algorithm) EmptyTree() ObjectID {
return algo.details().emptyTree
}
// HexLen returns the encoded hexadecimal length.
func (algo Algorithm) HexLen() int {
return algo.Size() * 2
}
// Size returns the hash size in bytes.
func (algo Algorithm) Size() int {
return algo.details().size
}
// New returns a new hash.Hash for this algorithm.
func (algo Algorithm) New() (hash.Hash, error) {
newFn := algo.details().new
if newFn == nil {
return nil, ErrInvalidAlgorithm
}
return newFn(), nil
}
// PackHashID returns the Git pack/rev hash-id encoding for this algorithm.
//
// Unknown algorithms return 0.
func (algo Algorithm) PackHashID() uint32 {
return algo.details().packHashID
}
// SignatureHeaderName returns the signature header name for this algorithm.
func (algo Algorithm) SignatureHeaderName() string {
return algo.details().signatureHeaderName
}
// String returns the canonical algorithm name.
func (algo Algorithm) String() string {
return algo.details().name
}
// Sum computes an object ID from raw data using the selected algorithm.
func (algo Algorithm) Sum(data []byte) ObjectID {
return algo.details().sum(data)
}
// Zero returns the all-zero object ID for this algorithm.
func (algo Algorithm) Zero() ObjectID {
return ObjectID{
algo: algo,
data: [maxObjectIDSize]byte{},
}
}
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