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.
94 lines
1.9 KiB
94 lines
1.9 KiB
// Copyright 2015 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"
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
const EMPTY_SHA = "0000000000000000000000000000000000000000"
|
|
|
|
type sha1 [20]byte
|
|
|
|
// Equal returns 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
|
|
}
|
|
|
|
// String returns 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)
|
|
}
|
|
|
|
// MustID always creates a new sha1 from a [20]byte array with no validation of input.
|
|
func MustID(b []byte) sha1 {
|
|
var id sha1
|
|
for i := 0; i < 20; i++ {
|
|
id[i] = b[i]
|
|
}
|
|
return id
|
|
}
|
|
|
|
// NewID creates a new sha1 from a [20]byte array.
|
|
func NewID(b []byte) (sha1, error) {
|
|
if len(b) != 20 {
|
|
return sha1{}, fmt.Errorf("Length must be 20: %v", b)
|
|
}
|
|
return MustID(b), nil
|
|
}
|
|
|
|
// MustIDFromString always creates a new sha from a ID with no validation of input.
|
|
func MustIDFromString(s string) sha1 {
|
|
b, _ := hex.DecodeString(s)
|
|
return MustID(b)
|
|
}
|
|
|
|
// NewIDFromString creates a new sha1 from a ID string of length 40.
|
|
func NewIDFromString(s string) (sha1, error) {
|
|
var id sha1
|
|
s = strings.TrimSpace(s)
|
|
if len(s) != 40 {
|
|
return id, fmt.Errorf("Length must be 40: %s", s)
|
|
}
|
|
b, err := hex.DecodeString(s)
|
|
if err != nil {
|
|
return id, err
|
|
}
|
|
return NewID(b)
|
|
}
|