runtime/base/unix_file/null_file.cc

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "base/unix_file/null_file.h"
#include <errno.h>

namespace unix_file {

NullFile::NullFile() {
}

NullFile::~NullFile() {
}

int NullFile::Close() {
  return 0;
}

int NullFile::Flush() {
  return 0;
}

int64_t NullFile::Read(char* buf ATTRIBUTE_UNUSED, int64_t byte_count ATTRIBUTE_UNUSED,
                       int64_t offset) const {
  if (offset < 0) {
    return -EINVAL;
  }
  return 0;
}

int NullFile::SetLength(int64_t new_length) {
  if (new_length < 0) {
    return -EINVAL;
  }
  return 0;
}

int64_t NullFile::GetLength() const {
  return 0;
}

int64_t NullFile::Write(const char* buf ATTRIBUTE_UNUSED, int64_t byte_count ATTRIBUTE_UNUSED,
                        int64_t offset) {
  if (offset < 0) {
    return -EINVAL;
  }
  return byte_count;
}

}  // namespace unix_file