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 "base/unix_file/null_file.h"
18 #include <errno.h>
19
20 namespace unix_file {
21
NullFile()22 NullFile::NullFile() {
23 }
24
~NullFile()25 NullFile::~NullFile() {
26 }
27
Close()28 int NullFile::Close() {
29 return 0;
30 }
31
Flush()32 int NullFile::Flush() {
33 return 0;
34 }
35
Read(char * buf,int64_t byte_count,int64_t offset) const36 int64_t NullFile::Read(char* buf, int64_t byte_count, int64_t offset) const {
37 if (offset < 0) {
38 return -EINVAL;
39 }
40 return 0;
41 }
42
SetLength(int64_t new_length)43 int NullFile::SetLength(int64_t new_length) {
44 if (new_length < 0) {
45 return -EINVAL;
46 }
47 return 0;
48 }
49
GetLength() const50 int64_t NullFile::GetLength() const {
51 return 0;
52 }
53
Write(const char * buf,int64_t byte_count,int64_t offset)54 int64_t NullFile::Write(const char* buf, int64_t byte_count, int64_t offset) {
55 if (offset < 0) {
56 return -EINVAL;
57 }
58 return byte_count;
59 }
60
61 } // namespace unix_file
62