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gitea/vendor/code.gitea.io/git/sha1.go

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// 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"
)
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// EmptySHA defines empty git SHA
const EmptySHA = "0000000000000000000000000000000000000000"
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// SHA1 a git commit name
type SHA1 [20]byte
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// Equal returns true if s has the same SHA1 as caller.
// Support 40-length-string, []byte, SHA1.
func (id SHA1) Equal(s2 interface{}) bool {
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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
}
}
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case SHA1:
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for i, v := range v {
if id[i] != v {
return false
}
}
default:
return false
}
return true
}
// String returns string (hex) representation of the Oid.
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func (id SHA1) String() string {
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result := make([]byte, 0, 40)
hexvalues := []byte("0123456789abcdef")
for i := 0; i < 20; i++ {
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result = append(result, hexvalues[id[i]>>4])
result = append(result, hexvalues[id[i]&0xf])
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}
return string(result)
}
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// MustID always creates a new SHA1 from a [20]byte array with no validation of input.
func MustID(b []byte) SHA1 {
var id SHA1
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for i := 0; i < 20; i++ {
id[i] = b[i]
}
return id
}
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// NewID creates a new SHA1 from a [20]byte array.
func NewID(b []byte) (SHA1, error) {
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if len(b) != 20 {
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return SHA1{}, fmt.Errorf("Length must be 20: %v", b)
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}
return MustID(b), nil
}
// MustIDFromString always creates a new sha from a ID with no validation of input.
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func MustIDFromString(s string) SHA1 {
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b, _ := hex.DecodeString(s)
return MustID(b)
}
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// NewIDFromString creates a new SHA1 from a ID string of length 40.
func NewIDFromString(s string) (SHA1, error) {
var id SHA1
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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)
}