2 files changed, 36 insertions, 2 deletions
diff --git a/base/file_util.h b/base/file_util.h
index d89fa71..108c998 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -506,6 +506,12 @@ class MemoryMappedFile {
   // ownership of |file| and close it when done.
   bool Initialize(base::PlatformFile file);
 
+#if defined(OS_WIN)
+  // Opens an existing file and maps it as an image section. Please refer to
+  // the Initialize function above for additional information.
+  bool InitializeAsImageSection(const FilePath& file_name);
+#endif  // OS_WIN
+
   const uint8* data() const { return data_; }
   size_t length() const { return length_; }
 
@@ -523,10 +529,14 @@ class MemoryMappedFile {
   // Closes all open handles. Later we may want to make this public.
   void CloseHandles();
 
-  base::PlatformFile file_;
 #if defined(OS_WIN)
+  // MapFileToMemoryInternal calls this function. It provides the ability to
+  // pass in flags which control the mapped section.
+  bool MapFileToMemoryInternalEx(int flags);
+
   HANDLE file_mapping_;
 #endif
+  base::PlatformFile file_;
   uint8* data_;
   size_t length_;
 
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index ab1dc94..2c26a16 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -938,7 +938,31 @@ MemoryMappedFile::MemoryMappedFile()
       length_(INVALID_FILE_SIZE) {
 }
 
+bool MemoryMappedFile::InitializeAsImageSection(const FilePath& file_name) {
+  if (IsValid())
+    return false;
+  file_ = base::CreatePlatformFile(
+      file_name, base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ,
+      NULL, NULL);
+
+  if (file_ == base::kInvalidPlatformFileValue) {
+    LOG(ERROR) << "Couldn't open " << file_name.value();
+    return false;
+  }
+
+  if (!MapFileToMemoryInternalEx(SEC_IMAGE)) {
+    CloseHandles();
+    return false;
+  }
+
+  return true;
+}
+
 bool MemoryMappedFile::MapFileToMemoryInternal() {
+  return MapFileToMemoryInternalEx(0);
+}
+
+bool MemoryMappedFile::MapFileToMemoryInternalEx(int flags) {
   base::ThreadRestrictions::AssertIOAllowed();
 
   if (file_ == INVALID_HANDLE_VALUE)
@@ -950,7 +974,7 @@ bool MemoryMappedFile::MapFileToMemoryInternal() {
 
   // length_ value comes from GetFileSize() above. GetFileSize() returns DWORD,
   // therefore the cast here is safe.
-  file_mapping_ = ::CreateFileMapping(file_, NULL, PAGE_READONLY,
+  file_mapping_ = ::CreateFileMapping(file_, NULL, PAGE_READONLY | flags,
                                       0, static_cast<DWORD>(length_), NULL);
   if (!file_mapping_) {
     // According to msdn, system error codes are only reserved up to 15999.