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gitea/modules/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 (
"bytes"
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"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:
return bytes.Equal(v, id[:])
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case SHA1:
return v == id
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default:
return false
}
}
// String returns string (hex) representation of the Oid.
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func (id SHA1) String() string {
return hex.EncodeToString(id[:])
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}
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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
copy(id[:], b)
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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)
}