mirror of
https://github.com/rclone/rclone.git
synced 2024-11-22 00:13:49 +01:00
lib/readers: add NoSeeker to adapt io.Reader to io.ReadSeeker
This commit is contained in:
parent
d61328e459
commit
e8f3f98aa0
22
lib/readers/noseeker.go
Normal file
22
lib/readers/noseeker.go
Normal file
@ -0,0 +1,22 @@
|
||||
package readers
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
)
|
||||
|
||||
var (
|
||||
errCantSeek = errors.New("can't Seek")
|
||||
)
|
||||
|
||||
// NoSeeker adapts an io.Reader into an io.ReadSeeker.
|
||||
//
|
||||
// However if Seek() is called it will return an error.
|
||||
type NoSeeker struct {
|
||||
io.Reader
|
||||
}
|
||||
|
||||
// Seek the stream - returns an error
|
||||
func (r NoSeeker) Seek(offset int64, whence int) (abs int64, err error) {
|
||||
return 0, errCantSeek
|
||||
}
|
31
lib/readers/noseeker_test.go
Normal file
31
lib/readers/noseeker_test.go
Normal file
@ -0,0 +1,31 @@
|
||||
package readers
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"io"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func TestNoSeeker(t *testing.T) {
|
||||
r := bytes.NewBufferString("hello")
|
||||
rs := NoSeeker{Reader: r}
|
||||
|
||||
// Check read
|
||||
b := make([]byte, 4)
|
||||
n, err := rs.Read(b)
|
||||
assert.NoError(t, err)
|
||||
assert.Equal(t, 4, n)
|
||||
assert.Equal(t, []byte("hell"), b)
|
||||
|
||||
// Check seek
|
||||
_, err = rs.Seek(0, io.SeekCurrent)
|
||||
assert.Equal(t, errCantSeek, err)
|
||||
}
|
||||
|
||||
// check interfaces
|
||||
var (
|
||||
_ io.Reader = NoSeeker{}
|
||||
_ io.Seeker = NoSeeker{}
|
||||
)
|
Loading…
Reference in New Issue
Block a user