164 lines
3.0 KiB
Go
164 lines
3.0 KiB
Go
package util
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import (
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"crypto/sha1"
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"encoding/hex"
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"errors"
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"hash"
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"io"
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"os"
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"path/filepath"
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"strings"
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)
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const SHA1ResultLength = 20
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type SHA1Result struct {
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result [SHA1ResultLength]byte
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err error
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}
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func (s *SHA1Result) Array() [SHA1ResultLength]byte {
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if s.err != nil {
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return [SHA1ResultLength]byte{}
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}
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return s.result
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}
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func (s *SHA1Result) Slice() []byte {
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if s.err != nil {
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return []byte{}
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}
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return s.result[:]
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}
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func (s *SHA1Result) Upper() string {
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if s.err != nil {
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return ""
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}
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return strings.ToUpper(hex.EncodeToString(s.result[:]))
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}
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func (s *SHA1Result) Lower() string {
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if s.err != nil {
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return ""
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}
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return strings.ToLower(hex.EncodeToString(s.result[:]))
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}
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func (s *SHA1Result) Error() error {
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return s.err
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}
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func NewSHA1Result(result []byte, err error) *SHA1Result {
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res := &SHA1Result{
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result: [SHA1ResultLength]byte{},
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err: err,
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}
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copy(res.result[:], result)
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return res
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}
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type SHA1 struct{}
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func NewSHA1() *SHA1 {
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return &SHA1{}
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}
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func (s *SHA1) FromReader(r io.Reader) *SHA1Result {
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ha := sha1.New()
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if _, err := io.Copy(ha, r); err != nil {
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return NewSHA1Result(nil, err)
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}
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hashInBytes := ha.Sum(nil)
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if len(hashInBytes) != SHA1ResultLength {
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return NewSHA1Result(nil, errors.New("wrong length"))
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}
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return NewSHA1Result(hashInBytes, nil)
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}
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func (s *SHA1) FromFile(filename string) *SHA1Result {
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file, err := os.Open(filepath.Clean(filename))
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if err != nil {
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return NewSHA1Result(nil, err)
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}
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defer func() {
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_ = file.Close()
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}()
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return s.FromReader(file)
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}
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func (s *SHA1) FromReaderChunk(r io.Reader, chunksize int) *SHA1Result {
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buf := make([]byte, chunksize)
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s1 := sha1.New()
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var n int
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var err error
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for {
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n, err = r.Read(buf)
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if err != nil {
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if err != io.EOF {
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return NewSHA1Result(nil, err)
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}
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if n > 0 {
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_, err = s1.Write(buf[:n])
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if err != nil {
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return NewSHA1Result(nil, err)
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}
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}
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break
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}
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_, err = s1.Write(buf[:n])
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if err != nil {
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return NewSHA1Result(nil, err)
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}
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}
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return NewSHA1Result(s1.Sum(nil), nil)
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}
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func (s *SHA1) FromFileChunk(filename string, chunksize int) *SHA1Result {
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file, err := os.Open(filepath.Clean(filename))
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if err != nil {
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return NewSHA1Result(nil, err)
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}
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defer func() {
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_ = file.Close()
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}()
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return s.FromReaderChunk(file, chunksize)
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}
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func (s *SHA1) FromBytes(b []byte) *SHA1Result {
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res := sha1.Sum(b)
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return NewSHA1Result(res[:], nil)
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}
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func (s *SHA1) FromString(str string) *SHA1Result {
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res := sha1.Sum([]byte(str))
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return NewSHA1Result(res[:], nil)
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}
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type SHA1Pip struct {
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sha1 hash.Hash
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}
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func NewSHA1Pip() *SHA1Pip {
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return &SHA1Pip{sha1: sha1.New()}
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}
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func (s *SHA1Pip) Write(data []byte) (n int, err error) {
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return s.sha1.Write(data)
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}
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func (s *SHA1Pip) WriteBytes(data []byte) error {
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_, err := s.Write(data)
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return err
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}
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func (s *SHA1Pip) WriteString(data string) error {
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_, err := s.Write([]byte(data))
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return err
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}
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func (s *SHA1Pip) Result() *SHA1Result {
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return NewSHA1Result(s.sha1.Sum(nil), nil)
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}
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