164 lines
2.9 KiB
Go
164 lines
2.9 KiB
Go
package util
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import (
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"crypto/md5"
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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 MD5ResultLength = 16
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type MD5Result struct {
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result [MD5ResultLength]byte
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err error
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}
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func (m *MD5Result) Array() [MD5ResultLength]byte {
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if m.err != nil {
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return [MD5ResultLength]byte{}
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}
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return m.result
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}
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func (m *MD5Result) Slice() []byte {
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if m.err != nil {
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return []byte{}
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}
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return m.result[:]
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}
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func (m *MD5Result) Upper() string {
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if m.err != nil {
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return ""
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}
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return strings.ToUpper(hex.EncodeToString(m.result[:]))
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}
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func (m *MD5Result) Lower() string {
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if m.err != nil {
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return ""
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}
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return strings.ToLower(hex.EncodeToString(m.result[:]))
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}
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func (m *MD5Result) Error() error {
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return m.err
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}
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func NewMD5Result(result []byte, err error) *MD5Result {
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res := &MD5Result{
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result: [MD5ResultLength]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 MD5 struct{}
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func NewMD5() *MD5 {
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return &MD5{}
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}
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func (m *MD5) FromReader(r io.Reader) *MD5Result {
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ha := md5.New()
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if _, err := io.Copy(ha, r); err != nil {
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return NewMD5Result(nil, err)
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}
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hashInBytes := ha.Sum(nil)
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if len(hashInBytes) != MD5ResultLength {
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return NewMD5Result(nil, errors.New("wrong length"))
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}
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return NewMD5Result(hashInBytes, nil)
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}
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func (m *MD5) FromFile(filename string) *MD5Result {
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file, err := os.Open(filepath.Clean(filename))
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if err != nil {
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return NewMD5Result(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 m.FromReader(file)
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}
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func (m *MD5) FromReaderChunk(r io.Reader, chunksize int) *MD5Result {
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buf := make([]byte, chunksize)
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m5 := md5.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 NewMD5Result(nil, err)
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}
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if n > 0 {
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_, err = m5.Write(buf[:n])
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if err != nil {
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return NewMD5Result(nil, err)
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}
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}
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break
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}
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_, err = m5.Write(buf[:n])
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if err != nil {
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return NewMD5Result(nil, err)
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}
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}
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return NewMD5Result(m5.Sum(nil), nil)
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}
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func (m *MD5) FromFileChunk(filename string, chunksize int) *MD5Result {
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file, err := os.Open(filepath.Clean(filename))
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if err != nil {
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return NewMD5Result(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 m.FromReaderChunk(file, chunksize)
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}
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func (m *MD5) FromBytes(b []byte) *MD5Result {
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res := md5.Sum(b)
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return NewMD5Result(res[:], nil)
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}
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func (m *MD5) FromString(str string) *MD5Result {
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res := md5.Sum([]byte(str))
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return NewMD5Result(res[:], nil)
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}
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type MD5Pip struct {
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md5 hash.Hash
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}
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func NewMD5Pip() *MD5Pip {
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return &MD5Pip{md5: md5.New()}
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}
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func (m *MD5Pip) Write(data []byte) (n int, err error) {
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return m.md5.Write(data)
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}
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func (m *MD5Pip) WriteBytes(data []byte) error {
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_, err := m.Write(data)
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return err
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}
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func (m *MD5Pip) WriteString(data string) error {
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_, err := m.Write([]byte(data))
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return err
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}
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func (m *MD5Pip) Result() *MD5Result {
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return NewMD5Result(m.md5.Sum(nil), nil)
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}
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