You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
1.6 KiB
88 lines
1.6 KiB
// Copyright 2014 The Gogs Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package git
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"errors"
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
IDNotExist = errors.New("sha1 ID does not exist")
|
|
)
|
|
|
|
type sha1 [20]byte
|
|
|
|
// Return true if s has the same sha1 as caller.
|
|
// Support 40-length-string, []byte, sha1
|
|
func (id sha1) Equal(s2 interface{}) bool {
|
|
switch v := s2.(type) {
|
|
case string:
|
|
if len(v) != 40 {
|
|
return false
|
|
}
|
|
return v == id.String()
|
|
case []byte:
|
|
if len(v) != 20 {
|
|
return false
|
|
}
|
|
for i, v := range v {
|
|
if id[i] != v {
|
|
return false
|
|
}
|
|
}
|
|
case sha1:
|
|
for i, v := range v {
|
|
if id[i] != v {
|
|
return false
|
|
}
|
|
}
|
|
default:
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Return string (hex) representation of the Oid
|
|
func (s sha1) String() string {
|
|
result := make([]byte, 0, 40)
|
|
hexvalues := []byte("0123456789abcdef")
|
|
for i := 0; i < 20; i++ {
|
|
result = append(result, hexvalues[s[i]>>4])
|
|
result = append(result, hexvalues[s[i]&0xf])
|
|
}
|
|
return string(result)
|
|
}
|
|
|
|
// Create a new sha1 from a 20 byte slice.
|
|
func NewId(b []byte) (sha1, error) {
|
|
var id sha1
|
|
if len(b) != 20 {
|
|
return id, errors.New("Length must be 20")
|
|
}
|
|
|
|
for i := 0; i < 20; i++ {
|
|
id[i] = b[i]
|
|
}
|
|
return id, nil
|
|
}
|
|
|
|
// Create a new sha1 from a Sha1 string of length 40.
|
|
func NewIdFromString(s string) (sha1, error) {
|
|
s = strings.TrimSpace(s)
|
|
var id sha1
|
|
if len(s) != 40 {
|
|
return id, fmt.Errorf("Length must be 40")
|
|
}
|
|
b, err := hex.DecodeString(s)
|
|
if err != nil {
|
|
return id, err
|
|
}
|
|
|
|
return NewId(b)
|
|
}
|