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- // 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
- }
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