Add embedder test for fpdfsave.cpp and bug 342

fpdfsdk/src/fpdfsave_embeddertest.cpp

+// Copyright 2016 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.
+
+#include <string.h>
+
+#include "core/include/fxcrt/fx_string.h"
+#include "public/fpdf_save.h"
+#include "public/fpdfview.h"
+#include "testing/embedder_test.h"
+#include "testing/fx_string_testhelpers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class FPDFSaveEmbedderTest : public EmbedderTest, public FPDF_FILEWRITE {
+ public:
+  FPDFSaveEmbedderTest() {
+    FPDF_FILEWRITE::version = 1;
+    FPDF_FILEWRITE::WriteBlock = WriteBlockCallback;
+  }
+  bool SaveDocumentToString() {
+    m_String.clear();
+    return FPDF_SaveAsCopy(document(), this, 0);
+  }
+  bool SaveDocumentWithVersionToString(int version) {
+    m_String.clear();
+    return FPDF_SaveWithVersion(document(), this, 0, version);
+  }
+  const std::string& GetString() const { return m_String; }
+
+ private:
+  static int WriteBlockCallback(FPDF_FILEWRITE* pFileWrite,
+                                const void* data,
+                                unsigned long size) {
+    FPDFSaveEmbedderTest* pThis =
+        static_cast<FPDFSaveEmbedderTest*>(pFileWrite);
+    pThis->m_String.append(static_cast<const char*>(data), size);
+    return 1;
+  }
+
+  std::string m_String;
+};
+
+TEST_F(FPDFSaveEmbedderTest, SaveSimpleDoc) {
+  EXPECT_TRUE(OpenDocument("hello_world.pdf"));
+  EXPECT_TRUE(SaveDocumentToString());
+  EXPECT_EQ("%PDF-1.7\r\n", GetString().substr(0, 10));
+  EXPECT_EQ(843, GetString().length());
+}
+
+TEST_F(FPDFSaveEmbedderTest, SaveSimpleDocWithVersion) {
+  EXPECT_TRUE(OpenDocument("hello_world.pdf"));
+  EXPECT_TRUE(SaveDocumentWithVersionToString(14));
+  EXPECT_EQ("%PDF-1.4\r\n", GetString().substr(0, 10));
+  EXPECT_EQ(843, GetString().length());
+}
+
+TEST_F(FPDFSaveEmbedderTest, SaveSimpleDocWithBadVersion) {
+  EXPECT_TRUE(OpenDocument("hello_world.pdf"));
+  EXPECT_TRUE(SaveDocumentWithVersionToString(-1));
+  EXPECT_EQ("%PDF-1.7\r\n", GetString().substr(0, 10));
+  EXPECT_TRUE(SaveDocumentWithVersionToString(0));
+  EXPECT_EQ("%PDF-1.7\r\n", GetString().substr(0, 10));
+  EXPECT_TRUE(SaveDocumentWithVersionToString(18));
+  EXPECT_EQ("%PDF-1.7\r\n", GetString().substr(0, 10));
+}
+
+TEST_F(FPDFSaveEmbedderTest, BUG_342) {
+  EXPECT_TRUE(OpenDocument("hello_world.pdf"));
+  EXPECT_TRUE(SaveDocumentToString());
+  EXPECT_EQ(std::string::npos, GetString().find("0000000000 65536 f\r\n"));
+  EXPECT_NE(std::string::npos, GetString().find("0000000000 65535 f\r\n"));
+}