2 files changed, 29 insertions, 0 deletions

diff --git a/src/libs/dutil/WixToolset.DUtil/inc/pathutil.h b/src/libs/dutil/WixToolset.DUtil/inc/pathutil.h
index f36e6ebc..971ef887 100644
--- a/src/libs/dutil/WixToolset.DUtil/inc/pathutil.h
+++ b/src/libs/dutil/WixToolset.DUtil/inc/pathutil.h
@@ -299,6 +299,16 @@ DAPI_(HRESULT) PathConcatRelativeToBase(
     );
 
 /*******************************************************************
+ PathConcatRelativeToFullyQualifiedBase - ensures the base path is
+    fully qualified and then calls PathConcatRelativeToBase.
+*******************************************************************/
+DAPI_(HRESULT) PathConcatRelativeToFullyQualifiedBase(
+    __in LPCWSTR wzBase,
+    __in_opt LPCWSTR wzRelative,
+    __deref_out_z LPWSTR* psczCombined
+    );
+
+/*******************************************************************
  PathCompareCanonicalized - canonicalizes the two paths using PathCanonicalizeForComparison
     which does not resolve relative paths into fully qualified paths.
     The strings are then compared using ::CompareStringW().
diff --git a/src/libs/dutil/WixToolset.DUtil/path2utl.cpp b/src/libs/dutil/WixToolset.DUtil/path2utl.cpp
index c6ff608c..3c4b2f88 100644
--- a/src/libs/dutil/WixToolset.DUtil/path2utl.cpp
+++ b/src/libs/dutil/WixToolset.DUtil/path2utl.cpp
@@ -162,6 +162,25 @@ LExit:
     return hr;
 }
 
+DAPI_(HRESULT) PathConcatRelativeToFullyQualifiedBase(
+    __in LPCWSTR wzBase,
+    __in_opt LPCWSTR wzRelative,
+    __deref_out_z LPWSTR* psczCombined
+    )
+{
+    HRESULT hr = S_OK;
+
+    if (!PathIsFullyQualified(wzBase))
+    {
+        PathExitWithRootFailure(hr, E_INVALIDARG, "wzBase must be fully qualified: %ls.", wzBase);
+    }
+
+    hr = PathConcatRelativeToBase(wzBase, wzRelative, psczCombined);
+
+LExit:
+    return hr;
+}
+
 DAPI_(HRESULT) PathCompareCanonicalized(
     __in_z LPCWSTR wzPath1,
     __in_z LPCWSTR wzPath2,