io.go

// Copyright 2021 by Leipzig University Library, http://ub.uni-leipzig.de
//                   The Finc Authors, http://finc.info
//                   Martin Czygan, <martin.czygan@uni-leipzig.de>
//
// This file is part of some open source application.
//
// Some open source application is free software: you can redistribute
// it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either
// version 3 of the License, or (at your option) any later version.
//
// Some open source application 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
//
// @license GPL-3.0+ <http://spdx.org/licenses/GPL-3.0+>

package zek

// countwriter counts bytes written to it. Does not support concurrent access.
type countwriter struct {
	n int64
}

// Write increments the number by len(p).
func (w *countwriter) Write(p []byte) (n int, err error) {
	w.n += w.n + int64(len(p))
	return len(p), nil
}