1//
2// Copyright (C) 2014 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#ifndef SHILL_PROTOBUF_LITE_STREAMS_H_
18#define SHILL_PROTOBUF_LITE_STREAMS_H_
19
20#include <string>
21
22#include <base/files/scoped_file.h>
23#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
24
25// Some basic input/output streams are not implemented for protobuf-lite.
26
27namespace shill {
28
29// Attempts to create a |google::protobuf::io::CopyingInputStreamAdaptor| using
30// a |shill::ProtobufLiteCopyingFileInputStream|. Returns a new instance on
31// success. The caller owns the new instance, and must free it when done.
32// Returns nullptr on failure.
33google::protobuf::io::CopyingInputStreamAdaptor *
34protobuf_lite_file_input_stream(const std::string& file_path);
35
36
37class ProtobufLiteCopyingFileInputStream :
38    public google::protobuf::io::CopyingInputStream {
39 public:
40  // Takes ownership of |fd| and closes it when the object is deleted.
41  explicit ProtobufLiteCopyingFileInputStream(int fd);
42  ~ProtobufLiteCopyingFileInputStream() override;
43  int Read(void* buffer, int size) override;
44  int Skip(int count) override;
45 private:
46  int fd_;
47  base::ScopedFD scoped_fd_closer_;
48  bool previous_seek_failed_;
49
50  DISALLOW_COPY_AND_ASSIGN(ProtobufLiteCopyingFileInputStream);
51};
52
53}  // namespace shill
54
55#endif  // SHILL_PROTOBUF_LITE_STREAMS_H_
56