GoToSocial/vendor/github.com/dsoprea/go-utility/v2/filesystem/read_counter.go
2022-01-23 14:41:31 +01:00

37 lines
719 B
Go

package rifs
import (
"io"
)
// ReadCounter proxies read requests and maintains a counter of bytes read.
type ReadCounter struct {
r io.Reader
counter int
}
// NewReadCounter returns a new `ReadCounter` struct wrapping a `Reader`.
func NewReadCounter(r io.Reader) *ReadCounter {
return &ReadCounter{
r: r,
}
}
// Count returns the total number of bytes read.
func (rc *ReadCounter) Count() int {
return rc.counter
}
// Reset resets the counter to zero.
func (rc *ReadCounter) Reset() {
rc.counter = 0
}
// Read forwards a read to the underlying `Reader` while bumping the counter.
func (rc *ReadCounter) Read(b []byte) (n int, err error) {
n, err = rc.r.Read(b)
rc.counter += n
return n, err
}