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diff --git a/samples/pdfium_test_write_helper.h b/samples/pdfium_test_write_helper.h
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+++ b/samples/pdfium_test_write_helper.h
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+// Copyright 2018 The 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.
+
+#ifndef SAMPLES_PDFIUM_TEST_WRITE_HELPER_H_
+#define SAMPLES_PDFIUM_TEST_WRITE_HELPER_H_
+
+#include <string>
+
+#include "public/fpdfview.h"
+
+#ifdef PDF_ENABLE_SKIA
+#include "third_party/skia/include/core/SkPictureRecorder.h"
+#include "third_party/skia/include/core/SkStream.h"
+#endif
+
+std::string WritePpm(const char* pdf_name,
+                     int num,
+                     const void* buffer_void,
+                     int stride,
+                     int width,
+                     int height);
+void WriteText(FPDF_PAGE page, const char* pdf_name, int num);
+void WriteAnnot(FPDF_PAGE page, const char* pdf_name, int num);
+std::string WritePng(const char* pdf_name,
+                     int num,
+                     const void* buffer_void,
+                     int stride,
+                     int width,
+                     int height);
+
+#ifdef _WIN32
+std::string WriteBmp(const char* pdf_name,
+                     int num,
+                     const void* buffer,
+                     int stride,
+                     int width,
+                     int height);
+void WriteEmf(FPDF_PAGE page, const char* pdf_name, int num);
+void WritePS(FPDF_PAGE page, const char* pdf_name, int num);
+#endif  // _WIN32
+
+#ifdef PDF_ENABLE_SKIA
+std::string WriteSkp(const char* pdf_name,
+                     int num,
+                     SkPictureRecorder* recorder);
+#endif  // PDF_ENABLE_SKIA
+
+void WriteAttachments(FPDF_DOCUMENT doc, const std::string& name);
+void WriteImages(FPDF_PAGE page, const char* pdf_name, int page_num);
+
+#endif  // SAMPLES_PDFIUM_TEST_WRITE_HELPER_H_