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diff --git a/src/VBox/Runtime/testcase/tstRTNtPath-1.cpp b/src/VBox/Runtime/testcase/tstRTNtPath-1.cpp
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+++ b/src/VBox/Runtime/testcase/tstRTNtPath-1.cpp
@@ -0,0 +1,213 @@
+/* $Id: tstRTNtPath-1.cpp $ */
+/** @file
+ * IPRT Testcase - RTNtPath*.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/errcore.h>
+#include <iprt/dir.h>
+#include <iprt/env.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/test.h>
+#include <iprt/utf16.h>
+
+
+/*********************************************************************************************************************************
+* Structures and Typedefs *
+*********************************************************************************************************************************/
+typedef struct TSTRAVERSE
+{
+ uint32_t cHits;
+ uint32_t cFirstClassHits;
+ uint32_t cEntries;
+ uint32_t cDirs;
+ UNICODE_STRING UniStr;
+ char szLongPath[RTPATH_MAX];
+ char szLongPathNt[RTPATH_MAX];
+ char szShortPath[RTPATH_MAX];
+ union
+ {
+ RTDIRENTRYEX EntryEx;
+ uint8_t abBuf[RTPATH_MAX + sizeof(RTDIRENTRYEX)];
+ } u;
+ size_t cbDirEntry;
+} TSTRAVERSE;
+
+
+void tstTraverse8dot3(TSTRAVERSE *pThis, size_t cchLong, size_t cchShort, uint32_t cShortNames)
+{
+ pThis->cDirs++;
+
+ uint32_t cLeftToTest = 2;
+ RTDIR hDir;
+ int rc = RTDirOpen(&hDir, pThis->szLongPath);
+ if (RT_FAILURE(rc))
+ return;
+ while (pThis->cFirstClassHits < 256)
+ {
+ pThis->cbDirEntry = sizeof(pThis->u);
+ rc = RTDirReadEx(hDir, &pThis->u.EntryEx, &pThis->cbDirEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
+ if (RT_FAILURE(rc))
+ break;
+ pThis->cEntries++;
+
+ if (RTDirEntryExIsStdDotLink(&pThis->u.EntryEx))
+ continue;
+
+ if ( cchLong + pThis->u.EntryEx.cbName + 1 >= sizeof(pThis->szLongPath)
+ || cchShort + RT_MAX(pThis->u.EntryEx.cbName, pThis->u.EntryEx.cwcShortName * 3) + 1 >= sizeof(pThis->szShortPath) )
+ continue; /* ignore obvious overflows */
+
+ bool fHave8Dot3 = pThis->u.EntryEx.cwcShortName
+ && RTUtf16ICmpUtf8(pThis->u.EntryEx.wszShortName, pThis->u.EntryEx.szName) != 0;
+ if ( fHave8Dot3
+ || RTFS_IS_DIRECTORY(pThis->u.EntryEx.Info.Attr.fMode)
+ || cLeftToTest > 0)
+ {
+ if (!fHave8Dot3)
+ memcpy(&pThis->szShortPath[cchShort], pThis->u.EntryEx.szName, pThis->u.EntryEx.cbName + 1);
+ else
+ {
+ char *pszDst = &pThis->szShortPath[cchShort];
+ rc = RTUtf16ToUtf8Ex(pThis->u.EntryEx.wszShortName, pThis->u.EntryEx.cwcShortName, &pszDst,
+ sizeof(pThis->szShortPath) - cchShort, NULL);
+ if (RT_FAILURE(rc))
+ continue;
+ }
+ memcpy(&pThis->szLongPath[cchLong], pThis->u.EntryEx.szName, pThis->u.EntryEx.cbName + 1);
+
+ /*
+ * Check it out.
+ */
+ HANDLE hRoot;
+ RTTESTI_CHECK_RC(rc = RTNtPathFromWinUtf8(&pThis->UniStr, &hRoot, pThis->szShortPath), VINF_SUCCESS);
+ if (RT_SUCCESS(rc))
+ {
+ RTTESTI_CHECK(pThis->UniStr.MaximumLength > pThis->UniStr.Length);
+ RTTESTI_CHECK(pThis->UniStr.Length == RTUtf16Len(pThis->UniStr.Buffer) * sizeof(RTUTF16));
+
+ RTTESTI_CHECK_RC(rc = RTNtPathEnsureSpace(&pThis->UniStr, RTPATH_MAX + 256), VINF_SUCCESS);
+ if (RT_SUCCESS(rc))
+ {
+ RTTESTI_CHECK_RC(rc = RTNtPathExpand8dot3Path(&pThis->UniStr, false /*fPathOnly*/), VINF_SUCCESS);
+ if (RT_SUCCESS(rc))
+ {
+ RTTESTI_CHECK(pThis->UniStr.Length == RTUtf16Len(pThis->UniStr.Buffer) * sizeof(RTUTF16));
+
+ /* Skip the win32 path prefix (it is usually \??\) so we can compare. Crude but works */
+ size_t offPrefix = 0;
+ while ( pThis->UniStr.Buffer[offPrefix] != pThis->szLongPath[0]
+ && pThis->UniStr.Buffer[offPrefix] != '\0')
+ offPrefix++;
+ if (!pThis->UniStr.Buffer[offPrefix])
+ offPrefix = 0;
+
+ if (RTUtf16CmpUtf8(&pThis->UniStr.Buffer[offPrefix], pThis->szLongPath) == 0)
+ { /* ok */ }
+ else if (RTUtf16ICmpUtf8(&pThis->UniStr.Buffer[offPrefix], pThis->szLongPath) == 0)
+ RTTestIFailed("case mismatch: '%ls' vs '%s'", pThis->UniStr.Buffer, pThis->szLongPath);
+ else
+ RTTestIFailed("mismatch: '%ls' vs '%s'", pThis->UniStr.Buffer, pThis->szLongPath);
+
+ /*
+ * Update test efficiency hits.
+ */
+ if ( cLeftToTest > 0
+ && !pThis->u.EntryEx.cwcShortName
+ && !RTFS_IS_DIRECTORY(pThis->u.EntryEx.Info.Attr.fMode))
+ {
+ cLeftToTest--;
+ if (cShortNames >= 3)
+ pThis->cFirstClassHits++;
+ }
+ pThis->cHits++;
+ }
+ }
+ RTNtPathFree(&pThis->UniStr, &hRoot);
+ }
+ //RTTestIPrintf(RTTESTLVL_ALWAYS, "debug: %u %u/%u %u/%u %s\n",
+ // cShortNames, pThis->cFirstClassHits, pThis->cHits, pThis->cDirs, pThis->cEntries, pThis->szShortPath);
+
+ /*
+ * Decend into sub-directories. Must add slash first.
+ */
+ if (RTFS_IS_DIRECTORY(pThis->u.EntryEx.Info.Attr.fMode))
+ {
+ pThis->szLongPath[cchLong + pThis->u.EntryEx.cbName] = '\\';
+ pThis->szLongPath[cchLong + pThis->u.EntryEx.cbName + 1] = '\0';
+ strcat(&pThis->szShortPath[cchShort], "\\");
+
+ tstTraverse8dot3(pThis,
+ cchLong + pThis->u.EntryEx.cbName + 1,
+ cchShort + strlen(&pThis->szShortPath[cchShort]),
+ cShortNames + (pThis->u.EntryEx.cwcShortName != 0));
+ }
+ }
+ }
+ RTDirClose(hDir);
+}
+
+
+int main()
+{
+ RTTEST hTest;
+ int rc = RTTestInitAndCreate("tstRTNtPath-1", &hTest);
+ if (rc)
+ return rc;
+ RTTestBanner(hTest);
+
+ /*
+ * Traverse the boot file system looking for short named and try locate an instance
+ * where we have at least 3 in a row.
+ */
+ RTTestSub(hTest, "8dot3");
+
+ TSTRAVERSE This;
+ RT_ZERO(This);
+ rc = RTEnvGetEx(RTENV_DEFAULT, "SystemDrive", This.szLongPath, 64, NULL);
+ if (RT_SUCCESS(rc))
+ {
+ RTStrCat(This.szLongPath, sizeof(This.szLongPath), "\\");
+ size_t cch = strlen(This.szLongPath);
+ memcpy(This.szShortPath, This.szLongPath, cch + 1);
+
+ tstTraverse8dot3(&This, cch, cch, 0);
+ RTTestIPrintf(RTTESTLVL_ALWAYS, "info: cEntries=%u cHits=%u cFirstClassHits=%u\n",
+ This.cEntries, This.cHits, This.cFirstClassHits);
+ }
+ else
+ RTTestSkipped(hTest, "failed to resolve %SystemDrive%: %Rrc", rc);
+
+ /*
+ * Summary.
+ */
+ return RTTestSummaryAndDestroy(hTest);
+}
+
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