1/*
2 * Copyright (C) 2013 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 "buffered_output_stream.h"
18
19#include <string.h>
20
21namespace art {
22
23BufferedOutputStream::BufferedOutputStream(std::unique_ptr<OutputStream> out)
24    : OutputStream(out->GetLocation()),  // Before out is moved to out_.
25      out_(std::move(out)),
26      used_(0) {}
27
28BufferedOutputStream::~BufferedOutputStream() {
29  FlushBuffer();
30}
31
32bool BufferedOutputStream::WriteFully(const void* buffer, size_t byte_count) {
33  if (byte_count > kBufferSize) {
34    if (!FlushBuffer()) {
35      return false;
36    }
37    return out_->WriteFully(buffer, byte_count);
38  }
39  if (used_ + byte_count > kBufferSize) {
40    if (!FlushBuffer()) {
41      return false;
42    }
43  }
44  const uint8_t* src = reinterpret_cast<const uint8_t*>(buffer);
45  memcpy(&buffer_[used_], src, byte_count);
46  used_ += byte_count;
47  return true;
48}
49
50bool BufferedOutputStream::Flush() {
51  return FlushBuffer() && out_->Flush();
52}
53
54bool BufferedOutputStream::FlushBuffer() {
55  bool success = true;
56  if (used_ > 0) {
57    success = out_->WriteFully(&buffer_[0], used_);
58    used_ = 0;
59  }
60  return success;
61}
62
63off_t BufferedOutputStream::Seek(off_t offset, Whence whence) {
64  if (!FlushBuffer()) {
65    return -1;
66  }
67  return out_->Seek(offset, whence);
68}
69
70}  // namespace art
71