1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
//
// Copyright (c) SAS Institute Inc.
//
// 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 readercounter
import "io"
// Wraps a Reader and counts how many bytes are read from it
type ReaderCounter struct {
R io.Reader // underlying Reader
N int64 // number of bytes read
}
func New(r io.Reader) *ReaderCounter {
return &ReaderCounter{R: r}
}
func (c *ReaderCounter) Read(d []byte) (int, error) {
n, err := c.R.Read(d)
c.N += int64(n)
return n, err
}
|
