1//
2// Copyright (C) 2009 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#include "update_engine/payload_consumer/file_writer.h"
18
19#include <errno.h>
20
21namespace chromeos_update_engine {
22
23int DirectFileWriter::Open(const char* path, int flags, mode_t mode) {
24  CHECK_EQ(fd_, -1);
25  fd_ = open(path, flags, mode);
26  if (fd_ < 0)
27    return -errno;
28  return 0;
29}
30
31bool DirectFileWriter::Write(const void* bytes, size_t count) {
32  CHECK_GE(fd_, 0);
33  const char* char_bytes = reinterpret_cast<const char*>(bytes);
34
35  size_t bytes_written = 0;
36  while (bytes_written < count) {
37    ssize_t rc = write(fd_, char_bytes + bytes_written,
38                       count - bytes_written);
39    if (rc < 0)
40      return false;
41    bytes_written += rc;
42  }
43  CHECK_EQ(bytes_written, count);
44  return bytes_written == count;
45}
46
47int DirectFileWriter::Close() {
48  CHECK_GE(fd_, 0);
49  int rc = close(fd_);
50
51  // This can be any negative number that's not -1. This way, this FileWriter
52  // won't be used again for another file.
53  fd_ = -2;
54
55  if (rc < 0)
56    return -errno;
57  return rc;
58}
59
60}  // namespace chromeos_update_engine
61