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diff --git a/accessible/windows/msaa/NtUndoc.h b/accessible/windows/msaa/NtUndoc.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_NtUndoc_h
+#define mozilla_NtUndoc_h
+
+#include <winternl.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#ifndef STATUS_INFO_LENGTH_MISMATCH
+# define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)
+#endif
+
+#ifndef STATUS_BUFFER_TOO_SMALL
+# define STATUS_BUFFER_TOO_SMALL ((NTSTATUS)0xC0000023L)
+#endif
+
+#ifndef STATUS_MORE_ENTRIES
+# define STATUS_MORE_ENTRIES ((NTSTATUS)0x00000105L)
+#endif
+
+enum UndocSystemInformationClass { SystemExtendedHandleInformation = 64 };
+
+struct SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX {
+ PVOID mObject;
+ ULONG_PTR mPid;
+ ULONG_PTR mHandle;
+ ACCESS_MASK mGrantedAccess;
+ USHORT mCreatorBackTraceIndex;
+ USHORT mObjectTypeIndex;
+ ULONG mAttributes;
+ ULONG mReserved;
+};
+
+struct SYSTEM_HANDLE_INFORMATION_EX {
+ ULONG_PTR mHandleCount;
+ ULONG_PTR mReserved;
+ SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX mHandles[1];
+};
+
+#ifndef __MINGW32__
+enum UndocObjectInformationClass { ObjectNameInformation = 1 };
+
+struct OBJECT_NAME_INFORMATION {
+ UNICODE_STRING Name;
+};
+#endif
+
+// The following declarations are documented on MSDN but are not included in
+// public user-mode headers.
+
+enum DirectoryObjectAccessFlags {
+ DIRECTORY_QUERY = 0x0001,
+ DIRECTORY_TRAVERSE = 0x0002,
+ DIRECTORY_CREATE_OBJECT = 0x0004,
+ DIRECTORY_CREATE_SUBDIRECTORY = 0x0008,
+ DIRECTORY_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED | 0x000F
+};
+
+NTSTATUS WINAPI NtOpenDirectoryObject(PHANDLE aDirectoryHandle,
+ ACCESS_MASK aDesiredAccess,
+ POBJECT_ATTRIBUTES aObjectAttributes);
+
+struct OBJECT_DIRECTORY_INFORMATION {
+ UNICODE_STRING mName;
+ UNICODE_STRING mTypeName;
+};
+
+NTSTATUS WINAPI NtQueryDirectoryObject(HANDLE aDirectoryHandle,
+ PVOID aOutBuffer, ULONG aBufferLength,
+ BOOLEAN aReturnSingleEntry,
+ BOOLEAN aRestartScan, PULONG aContext,
+ PULONG aOutReturnLength);
+
+#if defined(__cplusplus)
+} // extern "C"
+#endif
+
+#endif // mozilla_NtUndoc_h