Implement SharedMemory::NewAnonymousReadOnly(contents).

base/memory/shared_memory_win.cc

 // Copyright (c) 2011 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/memory/shared_memory.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 
 namespace {
@@ skipping 76 matching lines @@
   ::CloseHandle(handle);
 }
 
 // static
 size_t SharedMemory::GetHandleLimit() {
   // Rounded down from value reported here:
   // http://blogs.technet.com/b/markrussinovich/archive/2009/09/29/3283844.aspx
   return static_cast<size_t>(1 << 23);
 }
 
+// static
+scoped_ptr<SharedMemory> SharedMemory::NewAnonymousReadOnly(
+    StringPiece contents) {
+  SharedMemory writable_handle;
+  writable_handle.CreateAndMapAnonymous(contents.size());
+  memcpy(writable_handle.memory(), contents.data(), contents.size());
+  writable_handle.Unmap();
+
+  return make_scoped_ptr(new SharedMemory(
+      writable_handle.handle(), /*read_only=*/true, GetCurrentProcess()));
+}
+
 bool SharedMemory::CreateAndMapAnonymous(size_t size) {
   return CreateAnonymous(size) && Map(size);
 }
 
 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
   // TODO(bsy,sehr): crbug.com/210609 NaCl forces us to round up 64k here,
   // wasting 32k per mapping on average.
   static const size_t kSectionMask = 65536 - 1;
   DCHECK(!options.executable);
   DCHECK(!mapped_file_);
@@ skipping 144 matching lines @@
 void SharedMemory::Unlock() {
   DCHECK(lock_ != NULL);
   ReleaseMutex(lock_);
 }
 
 SharedMemoryHandle SharedMemory::handle() const {
   return mapped_file_;
 }
 
 }  // namespace base