Hooking MHTML generation to the browser.

This CL adds a class that can be used to generate MHTML for the current
page of a tab.
It is not yet surfaced in the UI.

BUG=None
TEST=Run the browser tests.


Review URL: http://codereview.chromium.org/7044095

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89047 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/ipc/ipc_platform_file.cc b/ipc/ipc_platform_file.cc
new file mode 100644
index 0000000..2b15ceb
--- /dev/null
+++ b/ipc/ipc_platform_file.cc
@@ -0,0 +1,43 @@
+// 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 "ipc/ipc_platform_file.h"
+
+namespace IPC {
+
+PlatformFileForTransit GetFileHandleForProcess(base::PlatformFile handle,
+                                               base::ProcessHandle process,
+                                               bool close_source_handle) {
+  IPC::PlatformFileForTransit out_handle;
+#if defined(OS_WIN)
+  DWORD options = DUPLICATE_SAME_ACCESS;
+  if (close_source_handle)
+    options |= DUPLICATE_CLOSE_SOURCE;
+  if (!::DuplicateHandle(::GetCurrentProcess(),
+                         handle,
+                         process,
+                         &out_handle,
+                         0,
+                         FALSE,
+                         options)) {
+    out_handle = IPC::InvalidPlatformFileForTransit();
+  }
+#elif defined(OS_POSIX)
+  // If asked to close the source, we can simply re-use the source fd instead of
+  // dup()ing and close()ing.
+  // When we're not closing the source, we need to duplicate the handle and take
+  // ownership of that. The reason is that this function is often used to
+  // generate IPC messages, and the handle must remain valid until it's sent to
+  // the other process from the I/O thread. Without the dup, calling code might
+  // close the source handle before the message is sent, creating a race
+  // condition.
+  int fd = close_source_handle ? handle : ::dup(handle);
+  out_handle = base::FileDescriptor(fd, true);
+#else
+  #error Not implemented.
+#endif
+  return out_handle;
+}
+
+}  // namespace IPC