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| 1 // Copyright 2016 PDFium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 |
| 7 #include "core/fpdfapi/parser/cpdf_linearized.h" |
| 8 |
| 9 #include <algorithm> |
| 10 |
| 11 #include "core/fpdfapi/parser/cpdf_array.h" |
| 12 #include "core/fpdfapi/parser/cpdf_dictionary.h" |
| 13 #include "third_party/base/ptr_util.h" |
| 14 |
| 15 // static |
| 16 std::unique_ptr<CPDF_Linearized> CPDF_Linearized::CreateForObject( |
| 17 std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pObj) { |
| 18 UniqueDictionary pDict = ToDictionary(std::move(pObj)); |
| 19 if (!pDict || !pDict->GetObjectFor("Linearized")) |
| 20 return nullptr; |
| 21 auto result = pdfium::WrapUnique(new CPDF_Linearized(pDict.get())); |
| 22 if (result->IsValid()) |
| 23 return result; |
| 24 return nullptr; |
| 25 } |
| 26 |
| 27 CPDF_Linearized::CPDF_Linearized(const CPDF_Dictionary* pDict) { |
| 28 m_szFileSize = std::max(pDict->GetIntegerFor("L"), 0); |
| 29 m_dwFirstPageNo = std::max(pDict->GetIntegerFor("P"), 0); |
| 30 m_szLastXRefOffset = std::max(pDict->GetIntegerFor("T"), 0); |
| 31 m_PageCount = std::max(pDict->GetIntegerFor("N"), 0); |
| 32 m_szFirstPageEndOffset = std::max(pDict->GetIntegerFor("E"), 0); |
| 33 m_FirstPageObjNum = std::max(pDict->GetIntegerFor("O"), 0); |
| 34 const CPDF_Array* pHintStreamRange = pDict->GetArrayFor("H"); |
| 35 const size_t nHintStreamSize = |
| 36 pHintStreamRange ? pHintStreamRange->GetCount() : 0; |
| 37 if (nHintStreamSize == 2 || nHintStreamSize == 4) { |
| 38 m_szHintStart = std::max(pHintStreamRange->GetIntegerAt(0), 0); |
| 39 m_szHintLength = std::max(pHintStreamRange->GetIntegerAt(1), 0); |
| 40 } |
| 41 } |
| 42 |
| 43 CPDF_Linearized::~CPDF_Linearized() {} |
| 44 |
| 45 bool CPDF_Linearized::IsValid() const { |
| 46 return GetFileSize() > 0 && GetFirstPageEndOffset() > 0 && |
| 47 GetPageCount() > 0 && (GetPageCount() == 1 || GetLastXRefOffset() > 0); |
| 48 } |
| 49 |
| 50 bool CPDF_Linearized::HasHintTable() const { |
| 51 return GetPageCount() > 1 && GetHintStart() > 0 && GetHintLength() > 0; |
| 52 } |
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