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base/file_util.cc

 // Copyright (c) 2006-2009 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 "base/file_util.h"
 
 #if defined(OS_WIN)
 #include <io.h>
 #endif
 #include <stdio.h>
@@ skipping 249 matching lines @@
   return true;
 }
 
 ///////////////////////////////////////////////
 // MemoryMappedFile
 
 MemoryMappedFile::~MemoryMappedFile() {
   CloseHandles();
 }
 
+bool MemoryMappedFile::Initialize(base::PlatformFile file) {
+  if (IsValid())
+    return false;
+
+  file_ = file;
+
+  if (!MapFileToMemoryInternal()) {
+    CloseHandles();
+    return false;
+  }
+
+  return true;
+}
+
 bool MemoryMappedFile::Initialize(const FilePath& file_name) {
   if (IsValid())
     return false;
 
   if (!MapFileToMemory(file_name)) {
     CloseHandles();
     return false;
   }
 
   return true;
 }
 
+bool MemoryMappedFile::MapFileToMemory(const FilePath& file_name) {
+  file_ = base::CreatePlatformFile(file_name,
+      base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ,
+      NULL);
+
+  if (file_ == base::kInvalidPlatformFileValue) {
+    LOG(ERROR) << "Couldn't open " << file_name.value();
+    return false;
+  }
+
+  return MapFileToMemoryInternal();
+}
+
 bool MemoryMappedFile::IsValid() {
   return data_ != NULL;
 }
 
 // Deprecated functions ----------------------------------------------------
 
 bool ReadFileToString(const std::wstring& path, std::string* contents) {
   return ReadFileToString(FilePath::FromWStringHack(path), contents);
 }
 
@@ skipping 128 matching lines @@
 
 bool FileEnumerator::IsDot(const FilePath& path) {
   return FILE_PATH_LITERAL(".") == path.BaseName().value();
 }
 
 bool FileEnumerator::IsDotDot(const FilePath& path) {
   return FILE_PATH_LITERAL("..") == path.BaseName().value();
 }
 
 }  // namespace