Add CPDF_Document::GetPage() unittests

core/fpdfapi/parser/cpdf_document_unittest.cpp

Index: core/fpdfapi/parser/cpdf_document_unittest.cpp
diff --git a/core/fpdfapi/parser/cpdf_document_unittest.cpp b/core/fpdfapi/parser/cpdf_document_unittest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..34661b18153e16bb648369dba6c623391a9cae87
--- /dev/null
+++ b/core/fpdfapi/parser/cpdf_document_unittest.cpp
@@ -0,0 +1,102 @@
+// 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 "core/fpdfapi/parser/cpdf_document.h"
+
+#include <memory>
+
+#include "core/fpdfapi/cpdf_modulemgr.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_parser.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+CPDF_Dictionary* CreatePageTreeNode(CPDF_Array* kids,
+                                    CPDF_Document* pDoc,
+                                    int count) {
+  CPDF_Dictionary* pageNode = new CPDF_Dictionary();
+  pageNode->SetStringFor("Type", "Pages");
+  pageNode->SetReferenceFor("Kids", pDoc, pDoc->AddIndirectObject(kids));
+  pageNode->SetIntegerFor("Count", count);
+  uint32_t pageNodeRef = pDoc->AddIndirectObject(pageNode);
+  for (size_t i = 0; i < kids->GetCount(); i++)
+    kids->GetDictAt(i)->SetReferenceFor("Parent", pDoc, pageNodeRef);
+  return pageNode;
+}
+
+CPDF_Dictionary* CreateNumberedPage(size_t number) {
+  CPDF_Dictionary* page = new CPDF_Dictionary();
+  page->SetStringFor("Type", "Page");
+  page->SetIntegerFor("PageNumbering", number);
+  return page;
+}
+
+}  // namespace
+
+class CPDF_TestDocumentForPages : public CPDF_Document {
+ public:
+  CPDF_TestDocumentForPages() : CPDF_Document(nullptr) {
+    CPDF_ModuleMgr* module_mgr = CPDF_ModuleMgr::Get();
+    module_mgr->InitPageModule();
+    // Set up test
+    CPDF_Array* zeroToTwo = new CPDF_Array();
+    zeroToTwo->AddReference(this, AddIndirectObject(CreateNumberedPage(0)));
+    zeroToTwo->AddReference(this, AddIndirectObject(CreateNumberedPage(1)));
+    zeroToTwo->AddReference(this, AddIndirectObject(CreateNumberedPage(2)));
+    CPDF_Dictionary* branch1 = CreatePageTreeNode(zeroToTwo, this, 3);
+
+    CPDF_Array* zeroToThree = new CPDF_Array();
+    zeroToThree->AddReference(this, branch1->GetObjNum());
+    zeroToThree->AddReference(this, AddIndirectObject(CreateNumberedPage(3)));
+    CPDF_Dictionary* branch2 = CreatePageTreeNode(zeroToThree, this, 4);
+
+    CPDF_Array* fourFive = new CPDF_Array();
+    fourFive->AddReference(this, AddIndirectObject(CreateNumberedPage(4)));
+    fourFive->AddReference(this, AddIndirectObject(CreateNumberedPage(5)));
+    CPDF_Dictionary* branch3 = CreatePageTreeNode(fourFive, this, 2);
+
+    CPDF_Array* justSix = new CPDF_Array();
+    justSix->AddReference(this, AddIndirectObject(CreateNumberedPage(6)));
+    CPDF_Dictionary* branch4 = CreatePageTreeNode(justSix, this, 1);
+
+    CPDF_Array* allPages = new CPDF_Array();
+    allPages->AddReference(this, branch2->GetObjNum());
+    allPages->AddReference(this, branch3->GetObjNum());
+    allPages->AddReference(this, branch4->GetObjNum());
+    CPDF_Dictionary* pagesDict = CreatePageTreeNode(allPages, this, 7);
+
+    CPDF_Dictionary* root = new CPDF_Dictionary();
+    root->SetReferenceFor("Pages", this, AddIndirectObject(pagesDict));
+    m_pRootDict = root;
+    m_PageList.SetSize(7);
+  }
+};
+
+TEST(cpdf_document, GetPages) {
+  std::unique_ptr<CPDF_TestDocumentForPages> document =
+      pdfium::MakeUnique<CPDF_TestDocumentForPages>();
+  for (int i = 0; i < 7; i++) {
+    CPDF_Dictionary* page = document->GetPage(i);
+    ASSERT_TRUE(page);
+    ASSERT_TRUE(page->GetObjectFor("PageNumbering"));
+    EXPECT_EQ(i, page->GetIntegerFor("PageNumbering"));
+  }
+  CPDF_Dictionary* page = document->GetPage(7);
+  EXPECT_FALSE(page);
+}
+
+TEST(cpdf_document, GetPagesReverseOrder) {
+  std::unique_ptr<CPDF_TestDocumentForPages> document =
+      pdfium::MakeUnique<CPDF_TestDocumentForPages>();
+  for (int i = 6; i >= 0; i--) {
+    CPDF_Dictionary* page = document->GetPage(i);
+    ASSERT_TRUE(page);
+    ASSERT_TRUE(page->GetObjectFor("PageNumbering"));
+    EXPECT_EQ(i, page->GetIntegerFor("PageNumbering"));
+  }
+  CPDF_Dictionary* page = document->GetPage(7);
+  EXPECT_FALSE(page);
+}