mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-18 04:10:22 +00:00
54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package limitwriter
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
)
|
|
|
|
// New creates a writer that is limited to writing at most n bytes to w. This writer is not
|
|
// thread safe.
|
|
func New(w io.Writer, n int64) io.Writer {
|
|
return &limitWriter{
|
|
w: w,
|
|
n: n,
|
|
}
|
|
}
|
|
|
|
// ErrMaximumWrite is returned when all bytes have been written.
|
|
var ErrMaximumWrite = errors.New("maximum write")
|
|
|
|
type limitWriter struct {
|
|
w io.Writer
|
|
n int64
|
|
}
|
|
|
|
func (w *limitWriter) Write(p []byte) (n int, err error) {
|
|
if int64(len(p)) > w.n {
|
|
p = p[:w.n]
|
|
}
|
|
if w.n > 0 {
|
|
n, err = w.w.Write(p)
|
|
w.n -= int64(n)
|
|
}
|
|
if w.n == 0 {
|
|
err = ErrMaximumWrite
|
|
}
|
|
return
|
|
}
|