1 files changed, 88 insertions, 0 deletions
diff --git a/widget/windows/IEnumFE.h b/widget/windows/IEnumFE.h
new file mode 100644
index 0000000000..b8cb6ad9d0
--- /dev/null
+++ b/widget/windows/IEnumFE.h
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 IEnumeFE_h__
+#define IEnumeFE_h__
+
+/*
+ * CEnumFormatEtc - implements IEnumFORMATETC
+ */
+
+#include <ole2.h>
+
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+
+// FORMATETC container
+class FormatEtc {
+ public:
+  FormatEtc() { memset(&mFormat, 0, sizeof(FORMATETC)); }
+  FormatEtc(const FormatEtc& copy) { CopyIn(&copy.mFormat); }
+  ~FormatEtc() {
+    if (mFormat.ptd) CoTaskMemFree(mFormat.ptd);
+  }
+
+  void CopyIn(const FORMATETC* aSrc) {
+    if (!aSrc) {
+      memset(&mFormat, 0, sizeof(FORMATETC));
+      return;
+    }
+    mFormat = *aSrc;
+    if (aSrc->ptd) {
+      mFormat.ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
+      *(mFormat.ptd) = *(aSrc->ptd);
+    }
+  }
+
+  void CopyOut(LPFORMATETC aDest) {
+    if (!aDest) return;
+    *aDest = mFormat;
+    if (mFormat.ptd) {
+      aDest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
+      *(aDest->ptd) = *(mFormat.ptd);
+    }
+  }
+
+ private:
+  FORMATETC mFormat;
+};
+
+/*
+ * CEnumFormatEtc is created within IDataObject::EnumFormatEtc. This object
+ * lives on its own, that is, QueryInterface only knows IUnknown and
+ * IEnumFormatEtc, nothing more.  We still use an outer unknown for reference
+ * counting, because as long as this enumerator lives, the data object should
+ * live, thereby keeping the application up.
+ */
+
+class CEnumFormatEtc final : public IEnumFORMATETC {
+ public:
+  explicit CEnumFormatEtc(nsTArray<FormatEtc>& aArray);
+  CEnumFormatEtc();
+  ~CEnumFormatEtc();
+
+  // IUnknown impl.
+  STDMETHODIMP QueryInterface(REFIID riid, LPVOID* ppv);
+  STDMETHODIMP_(ULONG) AddRef();
+  STDMETHODIMP_(ULONG) Release();
+
+  // IEnumFORMATETC impl.
+  STDMETHODIMP Next(ULONG aMaxToFetch, FORMATETC* aResult, ULONG* aNumFetched);
+  STDMETHODIMP Skip(ULONG aSkipNum);
+  STDMETHODIMP Reset();
+  STDMETHODIMP Clone(LPENUMFORMATETC* aResult);  // Addrefs
+
+  // Utils
+  void AddFormatEtc(LPFORMATETC aFormat);
+
+ private:
+  nsTArray<FormatEtc> mFormatList;  // Formats
+  ULONG mRefCnt;                    // Object reference count
+  ULONG mCurrentIdx;                // Current element
+
+  void SetIndex(uint32_t aIdx);
+};
+
+#endif  //_IENUMFE_H_