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/fpdfdoc/cpdf_numbertree.h" 8 9 #include "core/fpdfapi/parser/cpdf_array.h" 10 #include "core/fpdfapi/parser/cpdf_dictionary.h" 11 12 namespace { 13 SearchNumberNode(const CPDF_Dictionary * pNode,int num)14CPDF_Object* SearchNumberNode(const CPDF_Dictionary* pNode, int num) { 15 CPDF_Array* pLimits = pNode->GetArrayFor("Limits"); 16 if (pLimits && 17 (num < pLimits->GetIntegerAt(0) || num > pLimits->GetIntegerAt(1))) { 18 return nullptr; 19 } 20 CPDF_Array* pNumbers = pNode->GetArrayFor("Nums"); 21 if (pNumbers) { 22 for (size_t i = 0; i < pNumbers->GetCount() / 2; i++) { 23 int index = pNumbers->GetIntegerAt(i * 2); 24 if (num == index) 25 return pNumbers->GetDirectObjectAt(i * 2 + 1); 26 if (index > num) 27 break; 28 } 29 return nullptr; 30 } 31 32 CPDF_Array* pKids = pNode->GetArrayFor("Kids"); 33 if (!pKids) 34 return nullptr; 35 36 for (size_t i = 0; i < pKids->GetCount(); i++) { 37 CPDF_Dictionary* pKid = pKids->GetDictAt(i); 38 if (!pKid) 39 continue; 40 41 CPDF_Object* pFound = SearchNumberNode(pKid, num); 42 if (pFound) 43 return pFound; 44 } 45 return nullptr; 46 } 47 48 } // namespace 49 CPDF_NumberTree(CPDF_Dictionary * pRoot)50CPDF_NumberTree::CPDF_NumberTree(CPDF_Dictionary* pRoot) : m_pRoot(pRoot) {} 51 ~CPDF_NumberTree()52CPDF_NumberTree::~CPDF_NumberTree() {} 53 LookupValue(int num) const54CPDF_Object* CPDF_NumberTree::LookupValue(int num) const { 55 return SearchNumberNode(m_pRoot.Get(), num); 56 } 57