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   if (!MapFileToMemory(file_name)) {
  21     CloseHandles();
  22     return false;
  23   }
  24
  25   return true;
  26 }
  27
  28 bool MemoryMappedFile::Initialize(PlatformFile file) {
  29   if (IsValid())
  30     return false;
  31
  32   file_ = file;
  33
  34   if (!MapFileToMemoryInternal()) {
  35     CloseHandles();
  36     return false;
  37   }
  38
  39   return true;
  40 }
  41
  42 bool MemoryMappedFile::IsValid() const {
  43   return data_ != NULL;
  44 }
  45
  46 bool MemoryMappedFile::MapFileToMemory(const FilePath& file_name) {
  47   file_ = CreatePlatformFile(file_name, PLATFORM_FILE_OPEN | PLATFORM_FILE_READ,
  48                              NULL, NULL);
  49
  50   if (file_ == kInvalidPlatformFileValue) {
  51     DLOG(ERROR) << "Couldn't open " << file_name.AsUTF8Unsafe();
  52     return false;
  53   }
  54
  55   return MapFileToMemoryInternal();
  56 }
  57
  58 }  // namespace base