1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "net/disk_cache/blockfile/mapped_file.h"
6
7#include "base/files/file_path.h"
8#include "base/logging.h"
9#include "base/memory/scoped_ptr.h"
10#include "net/disk_cache/disk_cache.h"
11
12namespace disk_cache {
13
14void* MappedFile::Init(const base::FilePath& name, size_t size) {
15  DCHECK(!init_);
16  if (init_ || !File::Init(name))
17    return NULL;
18
19  buffer_ = NULL;
20  init_ = true;
21  section_ = CreateFileMapping(platform_file(), NULL, PAGE_READWRITE, 0,
22                               static_cast<DWORD>(size), NULL);
23  if (!section_)
24    return NULL;
25
26  buffer_ = MapViewOfFile(section_, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, size);
27  DCHECK(buffer_);
28  view_size_ = size;
29
30  // Make sure we detect hardware failures reading the headers.
31  size_t temp_len = size ? size : 4096;
32  scoped_ptr<char[]> temp(new char[temp_len]);
33  if (!Read(temp.get(), temp_len, 0))
34    return NULL;
35
36  return buffer_;
37}
38
39MappedFile::~MappedFile() {
40  if (!init_)
41    return;
42
43  if (buffer_) {
44    BOOL ret = UnmapViewOfFile(buffer_);
45    DCHECK(ret);
46  }
47
48  if (section_)
49    CloseHandle(section_);
50}
51
52void MappedFile::Flush() {
53}
54
55}  // namespace disk_cache
56