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 22 NullFile::NullFile() { 23 } 24 25 NullFile::~NullFile() { 26 } 27 28 int NullFile::Close() { 29 return 0; 30 } 31 32 int NullFile::Flush() { 33 return 0; 34 } 35 36 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 43 int NullFile::SetLength(int64_t new_length) { 44 if (new_length < 0) { 45 return -EINVAL; 46 } 47 return 0; 48 } 49 50 int64_t NullFile::GetLength() const { 51 return 0; 52 } 53 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
