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-rw-r--r--testing/libfuzzer/pdf_hint_table_fuzzer.cc83
1 files changed, 41 insertions, 42 deletions
diff --git a/testing/libfuzzer/pdf_hint_table_fuzzer.cc b/testing/libfuzzer/pdf_hint_table_fuzzer.cc
index b01c87216b..ec51517fc0 100644
--- a/testing/libfuzzer/pdf_hint_table_fuzzer.cc
+++ b/testing/libfuzzer/pdf_hint_table_fuzzer.cc
@@ -4,18 +4,11 @@
#include <cstdint>
+#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_hint_tables.h"
-
-struct DummyLinearizedDictionary {
- int end_of_first_page_offset;
- int number_of_pages;
- int first_page_object_number;
- int first_page_number;
- int primary_hint_stream_offset;
- int primary_hint_stream_length;
- int shared_hint_table_offset;
-};
+#include "core/fpdfapi/parser/cpdf_linearized.h"
+#include "third_party/base/ptr_util.h"
int32_t GetData(const int32_t** data32, const uint8_t** data, size_t* size) {
const int32_t* ret = *data32;
@@ -27,64 +20,70 @@ int32_t GetData(const int32_t** data32, const uint8_t** data, size_t* size) {
class HintTableForFuzzing : public CPDF_HintTables {
public:
- HintTableForFuzzing(DummyLinearizedDictionary* dict,
- CPDF_Dictionary* linearized_dict)
- : CPDF_HintTables(nullptr, linearized_dict), dict_(dict) {}
+ HintTableForFuzzing(CPDF_Linearized* pLinearized,
+ int shared_hint_table_offset)
+ : CPDF_HintTables(nullptr, pLinearized),
+ shared_hint_table_offset_(shared_hint_table_offset) {}
~HintTableForFuzzing() {}
void Fuzz(const uint8_t* data, size_t size) {
- if (dict_->shared_hint_table_offset <= 0)
+ if (shared_hint_table_offset_ <= 0)
return;
- if (size < static_cast<size_t>(dict_->shared_hint_table_offset))
+ if (size < static_cast<size_t>(shared_hint_table_offset_))
return;
CFX_BitStream bs;
bs.Init(data, size);
if (!ReadPageHintTable(&bs))
return;
- ReadSharedObjHintTable(&bs, dict_->shared_hint_table_offset);
+ ReadSharedObjHintTable(&bs, shared_hint_table_offset_);
}
private:
- int GetEndOfFirstPageOffset() const override {
- return dict_->end_of_first_page_offset;
- }
- int GetNumberOfPages() const override { return dict_->number_of_pages; }
- int GetFirstPageObjectNumber() const override {
- return dict_->first_page_object_number;
- }
- int GetFirstPageNumber() const override { return dict_->first_page_number; }
- int ReadPrimaryHintStreamOffset() const override {
- return dict_->primary_hint_stream_offset;
- }
- int ReadPrimaryHintStreamLength() const override {
- return dict_->primary_hint_stream_length;
- }
+ int shared_hint_table_offset_;
+};
- DummyLinearizedDictionary* const dict_;
+class FakeLinearized : public CPDF_Linearized {
+ public:
+ explicit FakeLinearized(CPDF_Dictionary* linearized_dict)
+ : CPDF_Linearized(linearized_dict) {}
};
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
- // Need 28 bytes for |dummy_dict|.
+ // Need 28 bytes for |linearized_dict|.
// The header section of page offset hint table is 36 bytes.
// The header section of shared object hint table is 24 bytes.
if (size < 28 + 36 + 24)
return 0;
const int32_t* data32 = reinterpret_cast<const int32_t*>(data);
- DummyLinearizedDictionary dummy_dict;
- dummy_dict.end_of_first_page_offset = GetData(&data32, &data, &size);
- dummy_dict.number_of_pages = GetData(&data32, &data, &size);
- dummy_dict.first_page_object_number = GetData(&data32, &data, &size);
- dummy_dict.first_page_number = GetData(&data32, &data, &size);
- dummy_dict.primary_hint_stream_offset = GetData(&data32, &data, &size);
- dummy_dict.primary_hint_stream_length = GetData(&data32, &data, &size);
- dummy_dict.shared_hint_table_offset = GetData(&data32, &data, &size);
- std::unique_ptr<CPDF_Dictionary> dummy_linearized_dict(new CPDF_Dictionary);
+ auto linearized_dict = pdfium::MakeUnique<CPDF_Dictionary>();
+ // Set initial value.
+ linearized_dict->SetBooleanFor("Linearized", true);
+ // Set first page end offset
+ linearized_dict->SetIntegerFor("E", GetData(&data32, &data, &size));
+ // Set page count
+ linearized_dict->SetIntegerFor("N", GetData(&data32, &data, &size));
+ // Set first page obj num
+ linearized_dict->SetIntegerFor("O", GetData(&data32, &data, &size));
+ // Set first page no
+ linearized_dict->SetIntegerFor("P", GetData(&data32, &data, &size));
+
+ auto hint_info = pdfium::MakeUnique<CPDF_Array>();
+ // Add primary hint stream offset
+ hint_info->AddInteger(GetData(&data32, &data, &size));
+ // Add primary hint stream size
+ hint_info->AddInteger(GetData(&data32, &data, &size));
+ // Set hint stream info.
+ linearized_dict->SetFor("H", hint_info.release());
+
+ const int shared_hint_table_offset = GetData(&data32, &data, &size);
+
{
- HintTableForFuzzing hint_table(&dummy_dict, dummy_linearized_dict.get());
+ FakeLinearized linearized(linearized_dict.get());
+ HintTableForFuzzing hint_table(&linearized, shared_hint_table_offset);
hint_table.Fuzz(data, size);
}
return 0;