94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
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// Copyright 2015 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git
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import (
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"encoding/hex"
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"fmt"
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"strings"
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)
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const EMPTY_SHA = "0000000000000000000000000000000000000000"
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type sha1 [20]byte
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// Equal returns true if s has the same sha1 as caller.
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// Support 40-length-string, []byte, sha1.
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func (id sha1) Equal(s2 interface{}) bool {
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switch v := s2.(type) {
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case string:
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if len(v) != 40 {
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return false
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}
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return v == id.String()
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case []byte:
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if len(v) != 20 {
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return false
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}
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for i, v := range v {
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if id[i] != v {
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return false
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}
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}
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case sha1:
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for i, v := range v {
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if id[i] != v {
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return false
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}
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}
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default:
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return false
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}
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return true
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}
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// String returns string (hex) representation of the Oid.
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func (s sha1) String() string {
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result := make([]byte, 0, 40)
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hexvalues := []byte("0123456789abcdef")
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for i := 0; i < 20; i++ {
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result = append(result, hexvalues[s[i]>>4])
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result = append(result, hexvalues[s[i]&0xf])
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}
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return string(result)
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}
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// MustID always creates a new sha1 from a [20]byte array with no validation of input.
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func MustID(b []byte) sha1 {
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var id sha1
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for i := 0; i < 20; i++ {
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id[i] = b[i]
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}
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return id
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}
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// NewID creates a new sha1 from a [20]byte array.
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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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}
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return MustID(b), nil
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}
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// 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)
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return MustID(b)
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}
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// NewIDFromString creates a new sha1 from a ID string of length 40.
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func NewIDFromString(s string) (sha1, error) {
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var id sha1
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s = strings.TrimSpace(s)
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if len(s) != 40 {
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return id, fmt.Errorf("Length must be 40: %s", s)
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return id, err
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}
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return NewID(b)
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}
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