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// Copyright 2016 The 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 <cstdint>
#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;
};
int32_t GetData(const int32_t** data32, const uint8_t** data, size_t* size) {
const int32_t* ret = *data32;
++(*data32);
*data += 4;
*size -= 4;
return *ret;
}
class HintTableForFuzzing : public CPDF_HintTables {
public:
HintTableForFuzzing(DummyLinearizedDictionary* dict,
CPDF_Dictionary* linearized_dict)
: CPDF_HintTables(nullptr, linearized_dict), dict_(dict) {}
~HintTableForFuzzing() {}
void Fuzz(const uint8_t* data, size_t size) {
if (dict_->shared_hint_table_offset <= 0)
return;
if (size < static_cast<size_t>(dict_->shared_hint_table_offset))
return;
CFX_BitStream bs;
bs.Init(data, size);
if (!ReadPageHintTable(&bs))
return;
ReadSharedObjHintTable(&bs, dict_->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;
}
DummyLinearizedDictionary* const dict_;
};
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// Need 28 bytes for |dummy_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);
{
HintTableForFuzzing hint_table(&dummy_dict, dummy_linearized_dict.get());
hint_table.Fuzz(data, size);
}
return 0;
}
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