Reorganize net/disk_cache into backend specific directories.

net/disk_cache/mapped_file_win.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "net/disk_cache/mapped_file.h"
-
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/memory/scoped_ptr.h"
-#include "net/disk_cache/disk_cache.h"
-
-namespace disk_cache {
-
-void* MappedFile::Init(const base::FilePath& name, size_t size) {
-  DCHECK(!init_);
-  if (init_ || !File::Init(name))
-    return NULL;
-
-  buffer_ = NULL;
-  init_ = true;
-  section_ = CreateFileMapping(platform_file(), NULL, PAGE_READWRITE, 0,
-                               static_cast<DWORD>(size), NULL);
-  if (!section_)
-    return NULL;
-
-  buffer_ = MapViewOfFile(section_, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, size);
-  DCHECK(buffer_);
-  view_size_ = size;
-
-  // Make sure we detect hardware failures reading the headers.
-  size_t temp_len = size ? size : 4096;
-  scoped_ptr<char[]> temp(new char[temp_len]);
-  if (!Read(temp.get(), temp_len, 0))
-    return NULL;
-
-  return buffer_;
-}
-
-MappedFile::~MappedFile() {
-  if (!init_)
-    return;
-
-  if (buffer_) {
-    BOOL ret = UnmapViewOfFile(buffer_);
-    DCHECK(ret);
-  }
-
-  if (section_)
-    CloseHandle(section_);
-}
-
-void MappedFile::Flush() {
-}
-
-}  // namespace disk_cache