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94 lines
3.1 KiB
94 lines
3.1 KiB
// Copyright 2016 The PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <cstdint>
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#include "core/fpdfapi/parser/cpdf_array.h"
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#include "core/fpdfapi/parser/cpdf_boolean.h"
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#include "core/fpdfapi/parser/cpdf_dictionary.h"
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#include "core/fpdfapi/parser/cpdf_hint_tables.h"
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#include "core/fpdfapi/parser/cpdf_linearized_header.h"
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#include "core/fpdfapi/parser/cpdf_number.h"
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#include "core/fxcrt/cfx_bitstream.h"
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#include "third_party/base/ptr_util.h"
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#include "third_party/base/span.h"
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int32_t GetData(const int32_t** data32, const uint8_t** data, size_t* size) {
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const int32_t* ret = *data32;
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++(*data32);
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*data += 4;
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*size -= 4;
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return *ret;
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}
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class HintTableForFuzzing final : public CPDF_HintTables {
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public:
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HintTableForFuzzing(CPDF_LinearizedHeader* pLinearized,
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int shared_hint_table_offset)
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: CPDF_HintTables(nullptr, pLinearized),
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shared_hint_table_offset_(shared_hint_table_offset) {}
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~HintTableForFuzzing() {}
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void Fuzz(const uint8_t* data, size_t size) {
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if (shared_hint_table_offset_ <= 0)
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return;
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if (size < static_cast<size_t>(shared_hint_table_offset_))
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return;
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CFX_BitStream bs(pdfium::make_span(data, size));
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if (!ReadPageHintTable(&bs))
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return;
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ReadSharedObjHintTable(&bs, shared_hint_table_offset_);
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}
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private:
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int shared_hint_table_offset_;
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};
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class FakeLinearized final : public CPDF_LinearizedHeader {
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public:
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explicit FakeLinearized(CPDF_Dictionary* linearized_dict)
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: CPDF_LinearizedHeader(linearized_dict, 0) {}
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};
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
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// Need 28 bytes for |linearized_dict|.
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// The header section of page offset hint table is 36 bytes.
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// The header section of shared object hint table is 24 bytes.
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if (size < 28 + 36 + 24)
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return 0;
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const int32_t* data32 = reinterpret_cast<const int32_t*>(data);
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auto linearized_dict = pdfium::MakeRetain<CPDF_Dictionary>();
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// Set initial value.
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linearized_dict->SetNewFor<CPDF_Boolean>("Linearized", true);
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// Set first page end offset
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linearized_dict->SetNewFor<CPDF_Number>("E", GetData(&data32, &data, &size));
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// Set page count
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linearized_dict->SetNewFor<CPDF_Number>("N", GetData(&data32, &data, &size));
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// Set first page obj num
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linearized_dict->SetNewFor<CPDF_Number>("O", GetData(&data32, &data, &size));
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// Set first page no
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linearized_dict->SetNewFor<CPDF_Number>("P", GetData(&data32, &data, &size));
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auto hint_info = pdfium::MakeRetain<CPDF_Array>();
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// Add primary hint stream offset
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hint_info->AddNew<CPDF_Number>(GetData(&data32, &data, &size));
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// Add primary hint stream size
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hint_info->AddNew<CPDF_Number>(GetData(&data32, &data, &size));
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// Set hint stream info.
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linearized_dict->SetFor("H", std::move(hint_info));
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const int shared_hint_table_offset = GetData(&data32, &data, &size);
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{
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FakeLinearized linearized(linearized_dict.Get());
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HintTableForFuzzing hint_table(&linearized, shared_hint_table_offset);
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hint_table.Fuzz(data, size);
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}
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return 0;
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}
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