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-rw-r--r--core/fpdfdoc/cpdf_nametree.cpp140
-rw-r--r--core/fpdfdoc/cpdf_nametree.h5
-rw-r--r--core/fpdfdoc/cpdf_nametree_unittest.cpp167
3 files changed, 299 insertions, 13 deletions
diff --git a/core/fpdfdoc/cpdf_nametree.cpp b/core/fpdfdoc/cpdf_nametree.cpp
index f30a27c681..4b4e7e81c2 100644
--- a/core/fpdfdoc/cpdf_nametree.cpp
+++ b/core/fpdfdoc/cpdf_nametree.cpp
@@ -6,38 +6,96 @@
#include "core/fpdfdoc/cpdf_nametree.h"
+#include <utility>
+#include <vector>
+
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
namespace {
const int nMaxRecursion = 32;
+// Get the limit arrays that leaf array |pFind| is under in the tree with root
+// |pNode|. |pLimits| will hold all the limit arrays from the leaf up to before
+// the root. Return true if successful.
+bool GetNodeLimits(const CPDF_Dictionary* pNode,
+ const CPDF_Array* pFind,
+ int nLevel,
+ std::vector<CPDF_Array*>* pLimits) {
+ if (nLevel > nMaxRecursion)
+ return false;
+
+ if (pNode->GetArrayFor("Names") == pFind) {
+ pLimits->push_back(pNode->GetArrayFor("Limits"));
+ return true;
+ }
+
+ CPDF_Array* pKids = pNode->GetArrayFor("Kids");
+ if (!pKids)
+ return false;
+
+ for (size_t i = 0; i < pKids->GetCount(); ++i) {
+ CPDF_Dictionary* pKid = pKids->GetDictAt(i);
+ if (!pKid)
+ continue;
+
+ if (GetNodeLimits(pKid, pFind, nLevel + 1, pLimits)) {
+ pLimits->push_back(pNode->GetArrayFor("Limits"));
+ return true;
+ }
+ }
+ return false;
+}
+
+// Search for |csName| in the tree with root |pNode|. If successful, return the
+// value that |csName| points to; |nIndex| will be the index of |csName|,
+// |ppFind| will be the leaf array that |csName| is found in, and |pFindIndex|
+// will be the index of |csName| in |ppFind|. If |csName| is not found, |ppFind|
+// will be the leaf array that |csName| should be added to, and |pFindIndex|
+// will be the index that it should be added at.
CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
const CFX_WideString& csName,
size_t& nIndex,
+ int nLevel,
CPDF_Array** ppFind,
- int nLevel = 0) {
+ int* pFindIndex) {
if (nLevel > nMaxRecursion)
return nullptr;
CPDF_Array* pLimits = pNode->GetArrayFor("Limits");
+ CPDF_Array* pNames = pNode->GetArrayFor("Names");
if (pLimits) {
CFX_WideString csLeft = pLimits->GetUnicodeTextAt(0);
CFX_WideString csRight = pLimits->GetUnicodeTextAt(1);
+ // If the lower limit is greater than the higher limit, swap them.
if (csLeft.Compare(csRight) > 0) {
- CFX_WideString csTmp = csRight;
- csRight = csLeft;
- csLeft = csTmp;
+ pLimits->SetNewAt<CPDF_String>(0, csRight);
+ pLimits->SetNewAt<CPDF_String>(1, csLeft);
+ csLeft = pLimits->GetUnicodeTextAt(0);
+ csRight = pLimits->GetUnicodeTextAt(1);
}
- if (csName.Compare(csLeft) < 0 || csName.Compare(csRight) > 0) {
+ // Skip this node if the name to look for is smaller than its lower limit.
+ if (csName.Compare(csLeft) < 0)
+ return nullptr;
+
+ // Skip this node if the name to look for is greater than its higher limit,
+ // and the node itself is a leaf node.
+ if (csName.Compare(csRight) > 0 && pNames) {
+ if (ppFind)
+ *ppFind = pNames;
+
+ if (pFindIndex)
+ *pFindIndex = pNames->GetCount() / 2 - 1;
+
return nullptr;
}
}
- CPDF_Array* pNames = pNode->GetArrayFor("Names");
+ // If the node is a leaf node, look for the name in its names array.
if (pNames) {
size_t dwCount = pNames->GetCount() / 2;
for (size_t i = 0; i < dwCount; i++) {
@@ -48,6 +106,10 @@ CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
if (ppFind)
*ppFind = pNames;
+
+ if (pFindIndex)
+ *pFindIndex = i;
+
if (iCompare < 0)
continue;
@@ -58,6 +120,7 @@ CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
return nullptr;
}
+ // Search through the node's children.
CPDF_Array* pKids = pNode->GetArrayFor("Kids");
if (!pKids)
return nullptr;
@@ -68,19 +131,22 @@ CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
continue;
CPDF_Object* pFound =
- SearchNameNode(pKid, csName, nIndex, ppFind, nLevel + 1);
+ SearchNameNode(pKid, csName, nIndex, nLevel + 1, ppFind, pFindIndex);
if (pFound)
return pFound;
}
return nullptr;
}
+// Get the key-value pair at |nIndex| in the tree with root |pNode|. If
+// successful, return the value object; |csName| will be the key, and |ppFind|
+// will be the leaf array that this pair is in.
CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
size_t nIndex,
size_t& nCurIndex,
+ int nLevel,
CFX_WideString* csName,
- CPDF_Array** ppFind,
- int nLevel = 0) {
+ CPDF_Array** ppFind) {
if (nLevel > nMaxRecursion)
return nullptr;
@@ -104,13 +170,14 @@ CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
if (!pKid)
continue;
CPDF_Object* pFound =
- SearchNameNode(pKid, nIndex, nCurIndex, csName, ppFind, nLevel + 1);
+ SearchNameNode(pKid, nIndex, nCurIndex, nLevel + 1, csName, ppFind);
if (pFound)
return pFound;
}
return nullptr;
}
+// Get the total number of key-value pairs in the tree with root |pNode|.
size_t CountNames(CPDF_Dictionary* pNode, int nLevel = 0) {
if (nLevel > nMaxRecursion)
return 0;
@@ -163,11 +230,58 @@ int CPDF_NameTree::GetIndex(const CFX_WideString& csName) const {
return -1;
size_t nIndex = 0;
- if (!SearchNameNode(m_pRoot.Get(), csName, nIndex, nullptr))
+ if (!SearchNameNode(m_pRoot.Get(), csName, nIndex, 0, nullptr, nullptr))
return -1;
return nIndex;
}
+bool CPDF_NameTree::AddValueAndName(std::unique_ptr<CPDF_Object> pObj,
+ const CFX_WideString& name) {
+ if (!m_pRoot)
+ return false;
+
+ size_t nIndex = 0;
+ CPDF_Array* pFind = nullptr;
+ int nFindIndex = -1;
+ // Fail if the tree already contains this name or if the tree is too deep.
+ if (SearchNameNode(m_pRoot.Get(), name, nIndex, 0, &pFind, &nFindIndex))
+ return false;
+
+ // If the returned |pFind| is a nullptr, then |name| is smaller than all
+ // existing entries in the tree, and we did not find a leaf array to place
+ // |name| into. We instead will find the leftmost leaf array in which to place
+ // |name| and |pObj|.
+ if (!pFind) {
+ size_t nCurIndex = 0;
+ CFX_WideString csName;
+ SearchNameNode(m_pRoot.Get(), 0, nCurIndex, 0, &csName, &pFind);
+ }
+ ASSERT(pFind);
+
+ // Insert the name and the object into the leaf array found. Note that the
+ // insertion position is right after the key-value pair returned by |index|.
+ size_t nNameIndex = (nFindIndex + 1) * 2;
+ size_t nValueIndex = nNameIndex + 1;
+ pFind->InsertNewAt<CPDF_String>(nNameIndex, name);
+ pFind->InsertAt(nValueIndex, std::move(pObj));
+
+ // Expand the limits that the newly added name is under, if the name falls
+ // outside of the limits of its leaf array or any arrays above it.
+ std::vector<CPDF_Array*> pLimits;
+ GetNodeLimits(m_pRoot.Get(), pFind, 0, &pLimits);
+ for (auto* pLimit : pLimits) {
+ if (!pLimit)
+ continue;
+
+ if (name.Compare(pLimit->GetUnicodeTextAt(0)) < 0)
+ pLimit->SetNewAt<CPDF_String>(0, name);
+
+ if (name.Compare(pLimit->GetUnicodeTextAt(1)) > 0)
+ pLimit->SetNewAt<CPDF_String>(1, name);
+ }
+ return true;
+}
+
CPDF_Object* CPDF_NameTree::LookupValueAndName(int nIndex,
CFX_WideString* csName) const {
csName->clear();
@@ -175,7 +289,7 @@ CPDF_Object* CPDF_NameTree::LookupValueAndName(int nIndex,
return nullptr;
size_t nCurIndex = 0;
- return SearchNameNode(m_pRoot.Get(), nIndex, nCurIndex, csName, nullptr);
+ return SearchNameNode(m_pRoot.Get(), nIndex, nCurIndex, 0, csName, nullptr);
}
CPDF_Object* CPDF_NameTree::LookupValue(const CFX_WideString& csName) const {
@@ -183,7 +297,7 @@ CPDF_Object* CPDF_NameTree::LookupValue(const CFX_WideString& csName) const {
return nullptr;
size_t nIndex = 0;
- return SearchNameNode(m_pRoot.Get(), csName, nIndex, nullptr);
+ return SearchNameNode(m_pRoot.Get(), csName, nIndex, 0, nullptr, nullptr);
}
CPDF_Array* CPDF_NameTree::LookupNamedDest(CPDF_Document* pDoc,
diff --git a/core/fpdfdoc/cpdf_nametree.h b/core/fpdfdoc/cpdf_nametree.h
index a56f511783..28239233ea 100644
--- a/core/fpdfdoc/cpdf_nametree.h
+++ b/core/fpdfdoc/cpdf_nametree.h
@@ -7,6 +7,8 @@
#ifndef CORE_FPDFDOC_CPDF_NAMETREE_H_
#define CORE_FPDFDOC_CPDF_NAMETREE_H_
+#include <memory>
+
#include "core/fxcrt/cfx_unowned_ptr.h"
#include "core/fxcrt/fx_string.h"
@@ -21,6 +23,9 @@ class CPDF_NameTree {
CPDF_NameTree(CPDF_Document* pDoc, const CFX_ByteString& category);
~CPDF_NameTree();
+ bool AddValueAndName(std::unique_ptr<CPDF_Object> pObj,
+ const CFX_WideString& name);
+
CPDF_Object* LookupValueAndName(int nIndex, CFX_WideString* csName) const;
CPDF_Object* LookupValue(const CFX_WideString& csName) const;
CPDF_Array* LookupNamedDest(CPDF_Document* pDoc, const CFX_WideString& sName);
diff --git a/core/fpdfdoc/cpdf_nametree_unittest.cpp b/core/fpdfdoc/cpdf_nametree_unittest.cpp
index bffb496843..4842f06a8e 100644
--- a/core/fpdfdoc/cpdf_nametree_unittest.cpp
+++ b/core/fpdfdoc/cpdf_nametree_unittest.cpp
@@ -9,6 +9,40 @@
#include "core/fpdfapi/parser/cpdf_string.h"
#include "testing/gtest/include/gtest/gtest.h"
+namespace {
+
+void AddNameKeyValue(CPDF_Array* pNames, const char* key, const int value) {
+ pNames->AddNew<CPDF_String>(key, false);
+ pNames->AddNew<CPDF_Number>(value);
+}
+
+void CheckNameKeyValue(CPDF_Array* pNames,
+ const int index,
+ const char* key,
+ const int value) {
+ EXPECT_STREQ(key, pNames->GetStringAt(index * 2).c_str());
+ EXPECT_EQ(value, pNames->GetIntegerAt(index * 2 + 1));
+}
+
+void AddLimitsArray(CPDF_Dictionary* pNode,
+ const char* least,
+ const char* greatest) {
+ CPDF_Array* pLimits = pNode->SetNewFor<CPDF_Array>("Limits");
+ pLimits->AddNew<CPDF_String>(least, false);
+ pLimits->AddNew<CPDF_String>(greatest, false);
+}
+
+void CheckLimitsArray(CPDF_Dictionary* pNode,
+ const char* least,
+ const char* greatest) {
+ CPDF_Array* pLimits = pNode->GetArrayFor("Limits");
+ ASSERT_TRUE(pLimits);
+ EXPECT_STREQ(least, pLimits->GetStringAt(0).c_str());
+ EXPECT_STREQ(greatest, pLimits->GetStringAt(1).c_str());
+}
+
+} // namespace
+
TEST(cpdf_nametree, GetUnicodeNameWithBOM) {
// Set up the root dictionary with a Names array.
auto pRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
@@ -34,3 +68,136 @@ TEST(cpdf_nametree, GetUnicodeNameWithBOM) {
ASSERT_TRUE(pObj->IsNumber());
EXPECT_EQ(100, pObj->AsNumber()->GetInteger());
}
+
+TEST(cpdf_nametree, AddIntoNames) {
+ // Set up a name tree with a single Names array.
+ auto pRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
+ CPDF_Array* pNames = pRootDict->SetNewFor<CPDF_Array>("Names");
+ AddNameKeyValue(pNames, "2.txt", 222);
+ AddNameKeyValue(pNames, "7.txt", 777);
+
+ CPDF_NameTree nameTree(pRootDict.get());
+ pNames = nameTree.GetRoot()->GetArrayFor("Names");
+
+ // Insert a name that already exists in the names array.
+ EXPECT_FALSE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(111), L"2.txt"));
+
+ // Insert in the beginning of the names array.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(111), L"1.txt"));
+
+ // Insert in the middle of the names array.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(555), L"5.txt"));
+
+ // Insert at the end of the names array.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(999), L"9.txt"));
+
+ // Check that the names array has the expected key-value pairs.
+ CheckNameKeyValue(pNames, 0, "1.txt", 111);
+ CheckNameKeyValue(pNames, 1, "2.txt", 222);
+ CheckNameKeyValue(pNames, 2, "5.txt", 555);
+ CheckNameKeyValue(pNames, 3, "7.txt", 777);
+ CheckNameKeyValue(pNames, 4, "9.txt", 999);
+}
+
+TEST(cpdf_nametree, AddIntoKids) {
+ // Set up a name tree with five nodes of three levels.
+ auto pRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
+ CPDF_Array* pKids = pRootDict->SetNewFor<CPDF_Array>("Kids");
+ CPDF_Dictionary* pKid1 = pKids->AddNew<CPDF_Dictionary>();
+
+ AddLimitsArray(pKid1, "1.txt", "9.txt");
+ pKids = pKid1->SetNewFor<CPDF_Array>("Kids");
+ CPDF_Dictionary* pKid2 = pKids->AddNew<CPDF_Dictionary>();
+ CPDF_Dictionary* pKid3 = pKids->AddNew<CPDF_Dictionary>();
+
+ AddLimitsArray(pKid2, "1.txt", "5.txt");
+ pKids = pKid2->SetNewFor<CPDF_Array>("Kids");
+ CPDF_Dictionary* pKid4 = pKids->AddNew<CPDF_Dictionary>();
+ CPDF_Dictionary* pKid5 = pKids->AddNew<CPDF_Dictionary>();
+
+ AddLimitsArray(pKid3, "9.txt", "9.txt");
+ CPDF_Array* pNames = pKid3->SetNewFor<CPDF_Array>("Names");
+ AddNameKeyValue(pNames, "9.txt", 999);
+
+ AddLimitsArray(pKid4, "1.txt", "2.txt");
+ pNames = pKid4->SetNewFor<CPDF_Array>("Names");
+ AddNameKeyValue(pNames, "1.txt", 111);
+ AddNameKeyValue(pNames, "2.txt", 222);
+
+ AddLimitsArray(pKid5, "3.txt", "5.txt");
+ pNames = pKid5->SetNewFor<CPDF_Array>("Names");
+ AddNameKeyValue(pNames, "3.txt", 333);
+ AddNameKeyValue(pNames, "5.txt", 555);
+
+ CPDF_NameTree nameTree(pRootDict.get());
+
+ // Check that adding an existing name would fail.
+ EXPECT_FALSE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(444), L"9.txt"));
+
+ // Add a name within the limits of a leaf node.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(444), L"4.txt"));
+ ASSERT_TRUE(nameTree.LookupValue(L"4.txt"));
+ EXPECT_EQ(444, nameTree.LookupValue(L"4.txt")->GetInteger());
+
+ // Add a name that requires changing the limits of two bottom levels.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(666), L"6.txt"));
+ ASSERT_TRUE(nameTree.LookupValue(L"6.txt"));
+ EXPECT_EQ(666, nameTree.LookupValue(L"6.txt")->GetInteger());
+
+ // Add a name that requires changing the limits of two top levels.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(99), L"99.txt"));
+ ASSERT_TRUE(nameTree.LookupValue(L"99.txt"));
+ EXPECT_EQ(99, nameTree.LookupValue(L"99.txt")->GetInteger());
+
+ // Add a name that requires changing the lower limit of all levels.
+ EXPECT_TRUE(
+ nameTree.AddValueAndName(pdfium::MakeUnique<CPDF_Number>(-5), L"0.txt"));
+ ASSERT_TRUE(nameTree.LookupValue(L"0.txt"));
+ EXPECT_EQ(-5, nameTree.LookupValue(L"0.txt")->GetInteger());
+
+ // Check that the node on the first level has the expected limits.
+ pKid1 = nameTree.GetRoot()->GetArrayFor("Kids")->GetDictAt(0);
+ ASSERT_TRUE(pKid1);
+ CheckLimitsArray(pKid1, "0.txt", "99.txt");
+
+ // Check that the nodes on the second level has the expected limits and names.
+ pKid2 = pKid1->GetArrayFor("Kids")->GetDictAt(0);
+ ASSERT_TRUE(pKid2);
+ CheckLimitsArray(pKid2, "0.txt", "6.txt");
+
+ pKid3 = pKid1->GetArrayFor("Kids")->GetDictAt(1);
+ ASSERT_TRUE(pKid3);
+ CheckLimitsArray(pKid3, "9.txt", "99.txt");
+ pNames = pKid3->GetArrayFor("Names");
+ ASSERT_TRUE(pNames);
+ CheckNameKeyValue(pNames, 0, "9.txt", 999);
+ CheckNameKeyValue(pNames, 1, "99.txt", 99);
+
+ // Check that the nodes on the third level has the expected limits and names.
+ pKid4 = pKid2->GetArrayFor("Kids")->GetDictAt(0);
+ ASSERT_TRUE(pKid4);
+ CheckLimitsArray(pKid4, "0.txt", "2.txt");
+ pNames = pKid4->GetArrayFor("Names");
+ ASSERT_TRUE(pNames);
+ CheckNameKeyValue(pNames, 0, "0.txt", -5);
+ CheckNameKeyValue(pNames, 1, "1.txt", 111);
+ CheckNameKeyValue(pNames, 2, "2.txt", 222);
+
+ pKid5 = pKid2->GetArrayFor("Kids")->GetDictAt(1);
+ ASSERT_TRUE(pKid5);
+ CheckLimitsArray(pKid5, "3.txt", "6.txt");
+ pNames = pKid5->GetArrayFor("Names");
+ ASSERT_TRUE(pNames);
+ CheckNameKeyValue(pNames, 0, "3.txt", 333);
+ CheckNameKeyValue(pNames, 1, "4.txt", 444);
+ CheckNameKeyValue(pNames, 2, "5.txt", 555);
+ CheckNameKeyValue(pNames, 3, "6.txt", 666);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 17:32:11 +0000