58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
// Copyright 2016 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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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fpdfdoc/cpdf_numbertree.h"
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#include "core/fpdfapi/parser/cpdf_array.h"
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#include "core/fpdfapi/parser/cpdf_dictionary.h"
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namespace {
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const CPDF_Object* SearchNumberNode(const CPDF_Dictionary* pNode, int num) {
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const CPDF_Array* pLimits = pNode->GetArrayFor("Limits");
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if (pLimits &&
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(num < pLimits->GetIntegerAt(0) || num > pLimits->GetIntegerAt(1))) {
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return nullptr;
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}
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const CPDF_Array* pNumbers = pNode->GetArrayFor("Nums");
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if (pNumbers) {
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for (size_t i = 0; i < pNumbers->size() / 2; i++) {
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int index = pNumbers->GetIntegerAt(i * 2);
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if (num == index)
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return pNumbers->GetDirectObjectAt(i * 2 + 1);
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if (index > num)
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break;
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}
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return nullptr;
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}
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const CPDF_Array* pKids = pNode->GetArrayFor("Kids");
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if (!pKids)
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return nullptr;
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for (size_t i = 0; i < pKids->size(); i++) {
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const CPDF_Dictionary* pKid = pKids->GetDictAt(i);
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if (!pKid)
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continue;
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const CPDF_Object* pFound = SearchNumberNode(pKid, num);
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if (pFound)
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return pFound;
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}
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return nullptr;
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}
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} // namespace
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CPDF_NumberTree::CPDF_NumberTree(const CPDF_Dictionary* pRoot)
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: m_pRoot(pRoot) {}
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CPDF_NumberTree::~CPDF_NumberTree() {}
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const CPDF_Object* CPDF_NumberTree::LookupValue(int num) const {
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return SearchNumberNode(m_pRoot.Get(), num);
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}
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