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// Copyright 2017 The PDFium Authors
// 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_object_avail.h"
#include <map>
#include <utility>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_indirect_object_holder.h"
#include "core/fpdfapi/parser/cpdf_read_validator.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fxcrt/fx_stream.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/invalid_seekable_read_stream.h"
#include "third_party/base/check.h"
#include "third_party/base/notreached.h"
namespace {
class TestReadValidator final : public CPDF_ReadValidator {
public:
CONSTRUCT_VIA_MAKE_RETAIN;
void SimulateReadError() { ReadBlockAtOffset({}, 0); }
private:
TestReadValidator()
: CPDF_ReadValidator(pdfium::MakeRetain<InvalidSeekableReadStream>(100),
nullptr) {}
~TestReadValidator() override = default;
};
class TestHolder final : public CPDF_IndirectObjectHolder {
public:
enum class ObjectState {
Unavailable,
Available,
};
TestHolder() : validator_(pdfium::MakeRetain<TestReadValidator>()) {}
~TestHolder() override = default;
// CPDF_IndirectObjectHolder overrides:
RetainPtr<CPDF_Object> ParseIndirectObject(uint32_t objnum) override {
auto it = objects_data_.find(objnum);
if (it == objects_data_.end())
return nullptr;
ObjectData& obj_data = it->second;
if (obj_data.state == ObjectState::Unavailable) {
validator_->SimulateReadError();
return nullptr;
}
return obj_data.object;
}
RetainPtr<CPDF_ReadValidator> GetValidator() { return validator_; }
void AddObject(uint32_t objnum,
RetainPtr<CPDF_Object> object,
ObjectState state) {
ObjectData object_data;
object_data.object = std::move(object);
object_data.state = state;
DCHECK(objects_data_.find(objnum) == objects_data_.end());
objects_data_[objnum] = std::move(object_data);
}
void SetObjectState(uint32_t objnum, ObjectState state) {
auto it = objects_data_.find(objnum);
DCHECK(it != objects_data_.end());
ObjectData& obj_data = it->second;
obj_data.state = state;
}
CPDF_Object* GetTestObject(uint32_t objnum) {
auto it = objects_data_.find(objnum);
if (it == objects_data_.end())
return nullptr;
return it->second.object.Get();
}
private:
struct ObjectData {
RetainPtr<CPDF_Object> object;
ObjectState state = ObjectState::Unavailable;
};
std::map<uint32_t, ObjectData> objects_data_;
RetainPtr<TestReadValidator> validator_;
};
class CPDF_ObjectAvailFailOnExclude final : public CPDF_ObjectAvail {
public:
using CPDF_ObjectAvail::CPDF_ObjectAvail;
~CPDF_ObjectAvailFailOnExclude() override = default;
bool ExcludeObject(const CPDF_Object* object) const override {
NOTREACHED_NORETURN();
}
};
class CPDF_ObjectAvailExcludeArray final : public CPDF_ObjectAvail {
public:
using CPDF_ObjectAvail::CPDF_ObjectAvail;
~CPDF_ObjectAvailExcludeArray() override = default;
bool ExcludeObject(const CPDF_Object* object) const override {
return object->IsArray();
}
};
class CPDF_ObjectAvailExcludeTypeKey final : public CPDF_ObjectAvail {
public:
using CPDF_ObjectAvail::CPDF_ObjectAvail;
~CPDF_ObjectAvailExcludeTypeKey() override = default;
bool ExcludeObject(const CPDF_Object* object) const override {
// The value of "Type" may be reference, and if it is not available, we can
// incorrect filter objects.
// In this case CPDF_ObjectAvail should wait availability of this item and
// call ExcludeObject again.
return object->IsDictionary() &&
object->GetDict()->GetByteStringFor("Type") == "Exclude me";
}
};
} // namespace
TEST(ObjectAvailTest, OneObject) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_String>(nullptr, "string", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(1, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, OneReferencedObject) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Reference>(&holder, 2),
TestHolder::ObjectState::Unavailable);
holder.AddObject(2, pdfium::MakeRetain<CPDF_String>(nullptr, "string", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(1, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(2, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, CycledReferences) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Reference>(&holder, 2),
TestHolder::ObjectState::Unavailable);
holder.AddObject(2, pdfium::MakeRetain<CPDF_Reference>(&holder, 3),
TestHolder::ObjectState::Unavailable);
holder.AddObject(3, pdfium::MakeRetain<CPDF_Reference>(&holder, 1),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(1, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(2, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(3, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, DoNotCheckParent) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Unavailable);
holder.AddObject(2, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Unavailable);
holder.GetTestObject(2)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"Parent", &holder, 1);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 2);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(2, TestHolder::ObjectState::Available);
// Object should be available in case when "Parent" object is unavailable.
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, Generic) {
TestHolder holder;
const uint32_t kDepth = 100;
for (uint32_t i = 1; i < kDepth; ++i) {
holder.AddObject(i, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Unavailable);
// Add ref to next dictionary.
holder.GetTestObject(i)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"Child", &holder, i + 1);
}
// Add final object
holder.AddObject(kDepth, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
for (uint32_t i = 1; i <= kDepth; ++i) {
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(i, TestHolder::ObjectState::Available);
}
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, NotExcludeRoot) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
CPDF_ObjectAvailFailOnExclude avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, NotExcludeReferedRoot) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Reference>(&holder, 2),
TestHolder::ObjectState::Available);
holder.AddObject(2, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
CPDF_ObjectAvailFailOnExclude avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, Exclude) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(1)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"ArrayRef", &holder, 2);
holder.AddObject(2, pdfium::MakeRetain<CPDF_Array>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(2)->AsMutableArray()->AppendNew<CPDF_Reference>(&holder,
2);
// Add string, which is refered by array item. It is should not be checked.
holder.AddObject(
3,
pdfium::MakeRetain<CPDF_String>(nullptr, "Not available string", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvailExcludeArray avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, ReadErrorOnExclude) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(1)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"DictRef", &holder, 2);
holder.AddObject(2, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(2)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"Type", &holder, 3);
// The value of "Type" key is not available at start
holder.AddObject(
3, pdfium::MakeRetain<CPDF_String>(nullptr, "Exclude me", false),
TestHolder::ObjectState::Unavailable);
holder.GetTestObject(2)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"OtherData", &holder, 4);
// Add string, which is referred by dictionary item. It is should not be
// checked, because the dictionary with it, should be skipped.
holder.AddObject(
4,
pdfium::MakeRetain<CPDF_String>(nullptr, "Not available string", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvailExcludeTypeKey avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
// Make "Type" value object available.
holder.SetObjectState(3, TestHolder::ObjectState::Available);
// Now object should be available, although the object '4' is not available,
// because it is in skipped dictionary.
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, IgnoreNotExistsObject) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(1)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"NotExistsObjRef", &holder, 2);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
// Now object should be available, although the object '2' is not exists. But
// all exists in file related data are checked.
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}
TEST(ObjectAvailTest, CheckTwice) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_String>(nullptr, "string", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, 1);
EXPECT_EQ(avail.CheckAvail(), avail.CheckAvail());
holder.SetObjectState(1, TestHolder::ObjectState::Available);
EXPECT_EQ(avail.CheckAvail(), avail.CheckAvail());
}
TEST(ObjectAvailTest, SelfReferedInlinedObject) {
TestHolder holder;
holder.AddObject(1, pdfium::MakeRetain<CPDF_Dictionary>(),
TestHolder::ObjectState::Available);
holder.GetTestObject(1)->GetMutableDict()->SetNewFor<CPDF_Reference>(
"Data", &holder, 2);
auto root =
holder.GetTestObject(1)->GetMutableDict()->SetNewFor<CPDF_Dictionary>(
"Dict");
root->SetNewFor<CPDF_Reference>("Self", &holder, 1);
holder.AddObject(2, pdfium::MakeRetain<CPDF_String>(nullptr, "Data", false),
TestHolder::ObjectState::Unavailable);
CPDF_ObjectAvail avail(holder.GetValidator(), &holder, root);
EXPECT_EQ(CPDF_DataAvail::kDataNotAvailable, avail.CheckAvail());
holder.SetObjectState(2, TestHolder::ObjectState::Available);
EXPECT_EQ(CPDF_DataAvail::kDataAvailable, avail.CheckAvail());
}