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diff --git a/fpdfsdk/cpdfsdk_customaccess.h b/fpdfsdk/cpdfsdk_customaccess.h
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+++ b/fpdfsdk/cpdfsdk_customaccess.h
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+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef FPDFSDK_CPDFSDK_CUSTOMACCESS_H_
+#define FPDFSDK_CPDFSDK_CUSTOMACCESS_H_
+
+#include "core/fxcrt/fx_stream.h"
+#include "public/fpdfview.h"
+
+class CPDFSDK_CustomAccess final : public IFX_SeekableReadStream {
+ public:
+  template <typename T, typename... Args>
+  friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+  // IFX_SeekableReadStream
+  FX_FILESIZE GetSize() override;
+  bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+
+ private:
+  explicit CPDFSDK_CustomAccess(FPDF_FILEACCESS* pFileAccess);
+
+  FPDF_FILEACCESS m_FileAccess;
+};
+
+#endif  // FPDFSDK_CPDFSDK_CUSTOMACCESS_H_