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// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lzma
import (
"errors"
"io"
)
// ErrLimit indicates that the limit of the LimitedByteWriter has been
// reached.
var ErrLimit = errors.New("limit reached")
// LimitedByteWriter provides a byte writer that can be written until a
// limit is reached. The field N provides the number of remaining
// bytes.
type LimitedByteWriter struct {
BW io.ByteWriter
N int64
}
// WriteByte writes a single byte to the limited byte writer. It returns
// ErrLimit if the limit has been reached. If the byte is successfully
// written the field N of the LimitedByteWriter will be decremented by
// one.
func (l *LimitedByteWriter) WriteByte(c byte) error {
if l.N <= 0 {
return ErrLimit
}
if err := l.BW.WriteByte(c); err != nil {
return err
}
l.N--
return nil
}
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