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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_array.h"
#include "core/fpdfapi/parser/cpdf_boolean.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_hint_tables.h"
#include "core/fpdfapi/parser/cpdf_linearized_header.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fxcrt/cfx_bitstream.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/span.h"
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(CPDF_LinearizedHeader* 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 (shared_hint_table_offset_ <= 0)
return;
if (size < static_cast<size_t>(shared_hint_table_offset_))
return;
CFX_BitStream bs(pdfium::make_span(data, size));
if (!ReadPageHintTable(&bs))
return;
ReadSharedObjHintTable(&bs, shared_hint_table_offset_);
}
private:
int shared_hint_table_offset_;
};
class FakeLinearized : public CPDF_LinearizedHeader {
public:
explicit FakeLinearized(CPDF_Dictionary* linearized_dict)
: CPDF_LinearizedHeader(linearized_dict, 0) {}
};
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
// 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);
auto linearized_dict = pdfium::MakeUnique<CPDF_Dictionary>();
// Set initial value.
linearized_dict->SetNewFor<CPDF_Boolean>("Linearized", true);
// Set first page end offset
linearized_dict->SetNewFor<CPDF_Number>("E", GetData(&data32, &data, &size));
// Set page count
linearized_dict->SetNewFor<CPDF_Number>("N", GetData(&data32, &data, &size));
// Set first page obj num
linearized_dict->SetNewFor<CPDF_Number>("O", GetData(&data32, &data, &size));
// Set first page no
linearized_dict->SetNewFor<CPDF_Number>("P", GetData(&data32, &data, &size));
auto hint_info = pdfium::MakeUnique<CPDF_Array>();
// Add primary hint stream offset
hint_info->AddNew<CPDF_Number>(GetData(&data32, &data, &size));
// Add primary hint stream size
hint_info->AddNew<CPDF_Number>(GetData(&data32, &data, &size));
// Set hint stream info.
linearized_dict->SetFor("H", std::move(hint_info));
const int shared_hint_table_offset = GetData(&data32, &data, &size);
{
FakeLinearized linearized(linearized_dict.get());
HintTableForFuzzing hint_table(&linearized, shared_hint_table_offset);
hint_table.Fuzz(data, size);
}
return 0;
}
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