vendor

vendor/github.com/ulikunitz/xz/lzma/bytewriter.go

@@ -0,0 +1,37 @@
+// Copyright 2014-2017 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
+}