Splitting fpdfdoc/doc_* part II.

core/fpdfdoc/cpdf_nametree.cpp

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fpdfdoc/include/cpdf_nametree.h"
+
+#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
+#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
+#include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
+
+namespace {
+
+const int nMaxRecursion = 32;
+
+CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
+                            const CFX_ByteString& csName,
+                            size_t& nIndex,
+                            CPDF_Array** ppFind,
+                            int nLevel = 0) {
+  if (nLevel > nMaxRecursion)
+    return nullptr;
+
+  CPDF_Array* pLimits = pNode->GetArrayBy("Limits");
+  if (pLimits) {
+    CFX_ByteString csLeft = pLimits->GetStringAt(0);
+    CFX_ByteString csRight = pLimits->GetStringAt(1);
+    if (csLeft.Compare(csRight.AsStringC()) > 0) {
+      CFX_ByteString csTmp = csRight;
+      csRight = csLeft;
+      csLeft = csTmp;
+    }
+    if (csName.Compare(csLeft.AsStringC()) < 0 ||
+        csName.Compare(csRight.AsStringC()) > 0) {
+      return nullptr;
+    }
+  }
+
+  CPDF_Array* pNames = pNode->GetArrayBy("Names");
+  if (pNames) {
+    size_t dwCount = pNames->GetCount() / 2;
+    for (size_t i = 0; i < dwCount; i++) {
+      CFX_ByteString csValue = pNames->GetStringAt(i * 2);
+      int32_t iCompare = csValue.Compare(csName.AsStringC());
+      if (iCompare <= 0) {
+        if (ppFind)
+          *ppFind = pNames;
+        if (iCompare < 0)
+          continue;
+      } else {
+        break;
+      }
+      nIndex += i;
+      return pNames->GetDirectObjectAt(i * 2 + 1);
+    }
+    nIndex += dwCount;
+    return nullptr;
+  }
+
+  CPDF_Array* pKids = pNode->GetArrayBy("Kids");
+  if (!pKids)
+    return nullptr;
+
+  for (size_t i = 0; i < pKids->GetCount(); i++) {
+    CPDF_Dictionary* pKid = pKids->GetDictAt(i);
+    if (!pKid)
+      continue;
+
+    CPDF_Object* pFound =
+        SearchNameNode(pKid, csName, nIndex, ppFind, nLevel + 1);
+    if (pFound)
+      return pFound;
+  }
+  return nullptr;
+}
+
+CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
+                            size_t nIndex,
+                            size_t& nCurIndex,
+                            CFX_ByteString& csName,
+                            CPDF_Array** ppFind,
+                            int nLevel = 0) {
+  if (nLevel > nMaxRecursion)
+    return nullptr;
+
+  CPDF_Array* pNames = pNode->GetArrayBy("Names");
+  if (pNames) {
+    size_t nCount = pNames->GetCount() / 2;
+    if (nIndex >= nCurIndex + nCount) {
+      nCurIndex += nCount;
+      return nullptr;
+    }
+    if (ppFind)
+      *ppFind = pNames;
+    csName = pNames->GetStringAt((nIndex - nCurIndex) * 2);
+    return pNames->GetDirectObjectAt((nIndex - nCurIndex) * 2 + 1);
+  }
+  CPDF_Array* pKids = pNode->GetArrayBy("Kids");
+  if (!pKids)
+    return nullptr;
+  for (size_t i = 0; i < pKids->GetCount(); i++) {
+    CPDF_Dictionary* pKid = pKids->GetDictAt(i);
+    if (!pKid)
+      continue;
+    CPDF_Object* pFound =
+        SearchNameNode(pKid, nIndex, nCurIndex, csName, ppFind, nLevel + 1);
+    if (pFound)
+      return pFound;
+  }
+  return nullptr;
+}
+
+size_t CountNames(CPDF_Dictionary* pNode, int nLevel = 0) {
+  if (nLevel > nMaxRecursion)
+    return 0;
+
+  CPDF_Array* pNames = pNode->GetArrayBy("Names");
+  if (pNames)
+    return pNames->GetCount() / 2;
+
+  CPDF_Array* pKids = pNode->GetArrayBy("Kids");
+  if (!pKids)
+    return 0;
+
+  size_t nCount = 0;
+  for (size_t i = 0; i < pKids->GetCount(); i++) {
+    CPDF_Dictionary* pKid = pKids->GetDictAt(i);
+    if (!pKid)
+      continue;
+
+    nCount += CountNames(pKid, nLevel + 1);
+  }
+  return nCount;
+}
+
+}  // namespace
+
+CPDF_NameTree::CPDF_NameTree(CPDF_Document* pDoc,
+                             const CFX_ByteString& category)
+    : m_pRoot(nullptr) {
+  CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return;
+
+  CPDF_Dictionary* pNames = pRoot->GetDictBy("Names");
+  if (!pNames)
+    return;
+
+  m_pRoot = pNames->GetDictBy(category);
+}
+
+size_t CPDF_NameTree::GetCount() const {
+  return m_pRoot ? ::CountNames(m_pRoot) : 0;
+}
+
+int CPDF_NameTree::GetIndex(const CFX_ByteString& csName) const {
+  if (!m_pRoot)
+    return -1;
+
+  size_t nIndex = 0;
+  if (!SearchNameNode(m_pRoot, csName, nIndex, nullptr))
+    return -1;
+  return nIndex;
+}
+
+CPDF_Object* CPDF_NameTree::LookupValue(int nIndex,
+                                        CFX_ByteString& csName) const {
+  if (!m_pRoot)
+    return nullptr;
+  size_t nCurIndex = 0;
+  return SearchNameNode(m_pRoot, nIndex, nCurIndex, csName, nullptr);
+}
+
+CPDF_Object* CPDF_NameTree::LookupValue(const CFX_ByteString& csName) const {
+  if (!m_pRoot)
+    return nullptr;
+  size_t nIndex = 0;
+  return SearchNameNode(m_pRoot, csName, nIndex, nullptr);
+}
+
+CPDF_Array* CPDF_NameTree::LookupNamedDest(CPDF_Document* pDoc,
+                                           const CFX_ByteString& sName) {
+  CPDF_Object* pValue = LookupValue(sName);
+  if (!pValue) {
+    CPDF_Dictionary* pDests = pDoc->GetRoot()->GetDictBy("Dests");
+    if (!pDests)
+      return nullptr;
+    pValue = pDests->GetDirectObjectBy(sName);
+  }
+  if (!pValue)
+    return nullptr;
+  if (CPDF_Array* pArray = pValue->AsArray())
+    return pArray;
+  if (CPDF_Dictionary* pDict = pValue->AsDictionary())
+    return pDict->GetArrayBy("D");
+  return nullptr;
+}