63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
|
|
// Copyright 2019 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
//go:build !gogit
|
|
|
|
package git
|
|
|
|
import (
|
|
"crypto/sha1"
|
|
"encoding/hex"
|
|
"hash"
|
|
"strconv"
|
|
)
|
|
|
|
// SHA1 a git commit name
|
|
type SHA1 [20]byte
|
|
|
|
// String returns a string representation of the SHA
|
|
func (s SHA1) String() string {
|
|
return hex.EncodeToString(s[:])
|
|
}
|
|
|
|
// IsZero returns whether this SHA1 is all zeroes
|
|
func (s SHA1) IsZero() bool {
|
|
var empty SHA1
|
|
return s == empty
|
|
}
|
|
|
|
// ComputeBlobHash compute the hash for a given blob content
|
|
func ComputeBlobHash(content []byte) SHA1 {
|
|
return ComputeHash(ObjectBlob, content)
|
|
}
|
|
|
|
// ComputeHash compute the hash for a given ObjectType and content
|
|
func ComputeHash(t ObjectType, content []byte) SHA1 {
|
|
h := NewHasher(t, int64(len(content)))
|
|
_, _ = h.Write(content)
|
|
return h.Sum()
|
|
}
|
|
|
|
// Hasher is a struct that will generate a SHA1
|
|
type Hasher struct {
|
|
hash.Hash
|
|
}
|
|
|
|
// NewHasher takes an object type and size and creates a hasher to generate a SHA
|
|
func NewHasher(t ObjectType, size int64) Hasher {
|
|
h := Hasher{sha1.New()}
|
|
_, _ = h.Write(t.Bytes())
|
|
_, _ = h.Write([]byte(" "))
|
|
_, _ = h.Write([]byte(strconv.FormatInt(size, 10)))
|
|
_, _ = h.Write([]byte{0})
|
|
return h
|
|
}
|
|
|
|
// Sum generates a SHA1 for the provided hash
|
|
func (h Hasher) Sum() (sha1 SHA1) {
|
|
copy(sha1[:], h.Hash.Sum(nil))
|
|
return
|
|
}
|