[Downloads] Consolidate MOTW annotation APIs into a single API.

content/browser/safe_util_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 <shlobj.h>
-#include <shobjidl.h>
-
-#include "content/browser/safe_util_win.h"
-
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/win/scoped_comptr.h"
-#include "ui/base/win/shell.h"
-#include "url/gurl.h"
-
-namespace content {
-namespace {
-
-// Sets the Zone Identifier on the file to "Internet" (3). Returns true if the
-// function succeeds, false otherwise. A failure is expected on system where
-// the Zone Identifier is not supported, like a machine with a FAT32 filesystem.
-// This function does not invoke Windows Attachment Execution Services.
-//
-// |full_path| is the path to the downloaded file.
-bool SetInternetZoneIdentifierDirectly(const base::FilePath& full_path) {
-  const DWORD kShare = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
-  std::wstring path = full_path.value() + L":Zone.Identifier";
-  HANDLE file = CreateFile(path.c_str(), GENERIC_WRITE, kShare, NULL,
-                           OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
-  if (INVALID_HANDLE_VALUE == file)
-    return false;
-
-  static const char kIdentifier[] = "[ZoneTransfer]\r\nZoneId=3\r\n";
-  // Don't include trailing null in data written.
-  static const DWORD kIdentifierSize = arraysize(kIdentifier) - 1;
-  DWORD written = 0;
-  BOOL result = WriteFile(file, kIdentifier, kIdentifierSize, &written, NULL);
-  BOOL flush_result = FlushFileBuffers(file);
-  CloseHandle(file);
-
-  if (!result || !flush_result || written != kIdentifierSize) {
-    NOTREACHED();
-    return false;
-  }
-
-  return true;
-}
-
-}  // namespace
-
-HRESULT AVScanFile(const base::FilePath& full_path,
-                   const std::string& source_url,
-                   const GUID& client_guid) {
-  base::win::ScopedComPtr<IAttachmentExecute> attachment_services;
-  HRESULT hr = attachment_services.CreateInstance(CLSID_AttachmentServices);
-
-  if (FAILED(hr)) {
-    // The thread must have COM initialized.
-    DCHECK_NE(CO_E_NOTINITIALIZED, hr);
-
-    // We don't have Attachment Execution Services, it must be a pre-XP.SP2
-    // Windows installation, or the thread does not have COM initialized. Try to
-    // set the zone information directly. Failure is not considered an error.
-    SetInternetZoneIdentifierDirectly(full_path);
-    return hr;
-  }
-
-  if (!IsEqualGUID(client_guid, GUID_NULL)) {
-    hr = attachment_services->SetClientGuid(client_guid);
-    if (FAILED(hr))
-      return hr;
-  }
-
-  hr = attachment_services->SetLocalPath(full_path.value().c_str());
-  if (FAILED(hr))
-    return hr;
-
-  // Note: SetSource looks like it needs to be called, even if empty.
-  // Docs say it is optional, but it appears not calling it at all sets
-  // a zone that is too restrictive.
-  hr = attachment_services->SetSource(base::UTF8ToWide(source_url).c_str());
-  if (FAILED(hr))
-    return hr;
-
-  // A failure in the Save() call below could result in the downloaded file
-  // being deleted.
-  return attachment_services->Save();
-}
-
-}  // namespace content