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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); | |
Lei Zhang
2016/11/03 17:18:00
Why did you decide GetLastXRefOffset() can be 0 wh
snake
2016/11/03 17:50:34
LastXRefOffset is offset to MainXRefTable, but if
| |
48 } | |
49 | |
50 bool CPDF_Linearized::HasHintTable() const { | |
51 return GetPageCount() > 1 && GetHintStart() > 0 && GetHintLength() > 0; | |
52 } | |
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