account for optional out parameters in IStream (#6345)

Co-authored-by: Jan Kučera <miloush@users.noreply.github.com>
dotnet · May 9, 2022 · 6b4faa7 · 6b4faa7
1 parent 6bce6e2
commit 6b4faa7
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/Microsoft.DotNet.Wpf/src/WpfGfx/core/api/exports.cpp b/src/Microsoft.DotNet.Wpf/src/WpfGfx/core/api/exports.cpp
@@ -759,6 +759,8 @@ CManagedStreamWrapper::Seek(
     __out_ecount(1) ULARGE_INTEGER* newPos
     )
 {
+    ULARGE_INTEGER newPosLocal;
+    if (!newPos) newPos = &newPosLocal;
     RRETURN(m_sd.pfnSeek(&m_sd, offset, origin, newPos));
 }
 
@@ -778,6 +780,8 @@ CManagedStreamWrapper::Write(
     __out_ecount(1) ULONG* cbWritten
     )
 {
+    ULONG cbWrittenLocal;
+    if (!cbWritten) cbWritten = &cbWrittenLocal;
     RRETURN(m_sd.pfnWrite(&m_sd, buf, cb, cbWritten));
 }
 
@@ -789,6 +793,10 @@ CManagedStreamWrapper::CopyTo(
     __out_ecount(1) ULARGE_INTEGER* cbWritten
     )
 {
+    ULARGE_INTEGER cbReadLocal;
+    ULARGE_INTEGER cbWrittenLocal;
+    if (!cbRead) cbRead = &cbReadLocal;
+    if (!cbWritten) cbWritten = &cbWrittenLocal;
     RRETURN(m_sd.pfnCopyTo(&m_sd, stream,cb, cbRead, cbWritten));
 }