1 // Copyright 2020 The Pigweed Authors
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
19 #include "pw_bytes/span.h"
20 #include "pw_status/status.h"
21 #include "pw_status/status_with_size.h"
22 #include "pw_stream/stream.h"
24 namespace pw::stream {
26 // Stream writer which quietly drops all of the data, similar to /dev/null.
27 class NullWriter final : public Writer {
29 Status DoWrite(ConstByteSpan) final { return OkStatus(); }
32 // Stream reader which never reads any bytes. Always returns OUT_OF_RANGE, which
33 // indicates there is no more data to read.
34 class NullReader final : public Reader {
36 StatusWithSize DoRead(ByteSpan) final { return StatusWithSize::OutOfRange(); }
39 } // namespace pw::stream