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countwriter.go
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/
countwriter.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package io
import "io"
// CountWriter is an io.Writer that keeps track of the number of bytes written to it.
type CountWriter struct {
count int64
writer io.Writer
}
func NewCountWriter(w io.Writer) *CountWriter {
return &CountWriter{
writer: w,
}
}
func (w *CountWriter) Write(p []byte) (int, error) {
n, err := w.writer.Write(p)
w.count += int64(n)
return n, err
}
// Count returns the total number of bytes written to the writer.
func (w *CountWriter) Count() int64 {
return w.count
}