base/files/memory_mapped_file.cc

   1 // Copyright 2013 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 "base/files/memory_mapped_file.h"
   6
   7 #include "base/files/file_path.h"
   8 #include "base/logging.h"
   9
  10 namespace base {
  11
  12 MemoryMappedFile::~MemoryMappedFile() {
  13   CloseHandles();
  14 }
  15
  16 bool MemoryMappedFile::Initialize(const FilePath& file_name) {
  17   if (IsValid())
  18     return false;
  19
  20   file_.Initialize(file_name, File::FLAG_OPEN | File::FLAG_READ);
  21
  22   if (!file_.IsValid()) {
  23     DLOG(ERROR) << "Couldn't open " << file_name.AsUTF8Unsafe();
  24     return false;
  25   }
  26
  27   if (!MapFileToMemory()) {
  28     CloseHandles();
  29     return false;
  30   }
  31
  32   return true;
  33 }
  34
  35 bool MemoryMappedFile::Initialize(File file) {
  36   if (IsValid())
  37     return false;
  38
  39   file_ = file.Pass();
  40
  41   if (!MapFileToMemory()) {
  42     CloseHandles();
  43     return false;
  44   }
  45
  46   return true;
  47 }
  48
  49 bool MemoryMappedFile::IsValid() const {
  50   return data_ != NULL;
  51 }
  52
  53 }  // namespace base