kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 1 | // Copyright 2023 The PDFium Authors |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "core/fpdfapi/parser/object_tree_traversal_util.h" |
| 6 | |
| 7 | #include <stdint.h> |
| 8 | |
| 9 | #include <set> |
| 10 | |
| 11 | #include "core/fpdfapi/parser/cpdf_document.h" |
| 12 | #include "testing/embedder_test.h" |
| 13 | #include "testing/gmock/include/gmock/gmock.h" |
| 14 | #include "testing/gtest/include/gtest/gtest.h" |
| 15 | |
| 16 | using testing::UnorderedElementsAreArray; |
| 17 | using ObjectTreeTraversalUtilEmbedderTest = EmbedderTest; |
| 18 | |
| 19 | namespace { |
| 20 | |
| 21 | CPDF_Document* GetCPDFDocument(FPDF_DOCUMENT document) { |
| 22 | // This is cheating slightly to avoid a layering violation, since this file |
| 23 | // cannot include fpdfsdk/cpdfsdk_helpers.h to get access to |
| 24 | // CPDFDocumentFromFPDFDocument(). |
| 25 | return reinterpret_cast<CPDF_Document*>((document)); |
| 26 | } |
| 27 | |
| 28 | } // namespace |
| 29 | |
| 30 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, GetObjectsWithReferencesBasic) { |
| 31 | ASSERT_TRUE(OpenDocument("hello_world.pdf")); |
| 32 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 33 | std::set<uint32_t> referenced_objects = GetObjectsWithReferences(doc); |
| 34 | EXPECT_THAT(referenced_objects, |
| 35 | UnorderedElementsAreArray({1, 2, 3, 4, 5, 6})); |
| 36 | } |
| 37 | |
| 38 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, GetObjectsWithReferencesNewDoc) { |
| 39 | ScopedFPDFDocument new_doc(FPDF_CreateNewDocument()); |
| 40 | CPDF_Document* doc = GetCPDFDocument(new_doc.get()); |
| 41 | std::set<uint32_t> referenced_objects = GetObjectsWithReferences(doc); |
| 42 | // Empty documents have a catalog and an empty pages object. |
| 43 | EXPECT_THAT(referenced_objects, UnorderedElementsAreArray({1, 2})); |
| 44 | } |
| 45 | |
| 46 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 47 | GetObjectsWithReferencesCircularRefs) { |
| 48 | ASSERT_TRUE(OpenDocument("circular_viewer_ref.pdf")); |
| 49 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 50 | std::set<uint32_t> referenced_objects = GetObjectsWithReferences(doc); |
| 51 | // The trailer points at a catalog, and the catalog only references itself. |
| 52 | EXPECT_THAT(referenced_objects, UnorderedElementsAreArray({1})); |
| 53 | } |
| 54 | |
| 55 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 56 | GetObjectsWithReferencesCrossRefStream) { |
| 57 | ASSERT_TRUE(OpenDocument("bug_1399.pdf")); |
| 58 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 59 | std::set<uint32_t> referenced_objects = GetObjectsWithReferences(doc); |
| 60 | // The trailer is the dictionary inside /XRef object 16 0. Note that it |
| 61 | // references object 3 0, but the rest of the document does not. |
| 62 | EXPECT_THAT(referenced_objects, |
| 63 | UnorderedElementsAreArray({1, 2, 3, 4, 5, 12, 13, 14, 16})); |
| 64 | } |
| 65 | |
| 66 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 67 | GetObjectsWithMultipleReferencesBasic) { |
| 68 | ASSERT_TRUE(OpenDocument("hello_world.pdf")); |
| 69 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 70 | std::set<uint32_t> referenced_objects = GetObjectsWithMultipleReferences(doc); |
| 71 | EXPECT_TRUE(referenced_objects.empty()); |
| 72 | } |
| 73 | |
| 74 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 75 | GetObjectsWithMultipleReferencesNewDoc) { |
| 76 | ScopedFPDFDocument new_doc(FPDF_CreateNewDocument()); |
| 77 | CPDF_Document* doc = GetCPDFDocument(new_doc.get()); |
| 78 | std::set<uint32_t> referenced_objects = GetObjectsWithMultipleReferences(doc); |
| 79 | EXPECT_TRUE(referenced_objects.empty()); |
| 80 | } |
| 81 | |
| 82 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 83 | GetObjectsWithMultipleReferencesCircularRefs) { |
| 84 | ASSERT_TRUE(OpenDocument("circular_viewer_ref.pdf")); |
| 85 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 86 | std::set<uint32_t> referenced_objects = GetObjectsWithMultipleReferences(doc); |
| 87 | EXPECT_TRUE(referenced_objects.empty()); |
| 88 | } |
| 89 | |
| 90 | TEST_F(ObjectTreeTraversalUtilEmbedderTest, |
| 91 | GetObjectsWithMultipleReferencesSharedObjects) { |
| 92 | ASSERT_TRUE(OpenDocument("hello_world_2_pages.pdf")); |
| 93 | CPDF_Document* doc = GetCPDFDocument(document()); |
| 94 | std::set<uint32_t> referenced_objects = GetObjectsWithMultipleReferences(doc); |
| 95 | EXPECT_THAT(referenced_objects, UnorderedElementsAreArray({5, 6, 7})); |
| 96 | } |