diff options
Diffstat (limited to 'core/fpdfdoc/doc_tagged.cpp')
| -rw-r--r-- | core/fpdfdoc/doc_tagged.cpp | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/core/fpdfdoc/doc_tagged.cpp b/core/fpdfdoc/doc_tagged.cpp new file mode 100644 index 0000000000..015f4db878 --- /dev/null +++ b/core/fpdfdoc/doc_tagged.cpp @@ -0,0 +1,440 @@ +// Copyright 2014 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 <map> + +#include "core/fpdfdoc/doc_utils.h" +#include "core/fpdfdoc/tagged_int.h" +#include "core/include/fpdfapi/cpdf_array.h" +#include "core/include/fpdfapi/cpdf_dictionary.h" +#include "core/include/fpdfapi/cpdf_document.h" +#include "core/include/fpdfapi/cpdf_reference.h" +#include "core/include/fpdfapi/fpdf_page.h" +#include "core/include/fpdfdoc/fpdf_tagged.h" + +const int nMaxRecursion = 32; +static FX_BOOL IsTagged(const CPDF_Document* pDoc) { + CPDF_Dictionary* pCatalog = pDoc->GetRoot(); + CPDF_Dictionary* pMarkInfo = pCatalog->GetDictBy("MarkInfo"); + return pMarkInfo && pMarkInfo->GetIntegerBy("Marked"); +} +CPDF_StructTree* CPDF_StructTree::LoadPage(const CPDF_Document* pDoc, + const CPDF_Dictionary* pPageDict) { + if (!IsTagged(pDoc)) { + return NULL; + } + CPDF_StructTreeImpl* pTree = new CPDF_StructTreeImpl(pDoc); + pTree->LoadPageTree(pPageDict); + return pTree; +} +CPDF_StructTree* CPDF_StructTree::LoadDoc(const CPDF_Document* pDoc) { + if (!IsTagged(pDoc)) { + return NULL; + } + CPDF_StructTreeImpl* pTree = new CPDF_StructTreeImpl(pDoc); + pTree->LoadDocTree(); + return pTree; +} +CPDF_StructTreeImpl::CPDF_StructTreeImpl(const CPDF_Document* pDoc) { + CPDF_Dictionary* pCatalog = pDoc->GetRoot(); + m_pTreeRoot = pCatalog->GetDictBy("StructTreeRoot"); + if (!m_pTreeRoot) { + return; + } + m_pRoleMap = m_pTreeRoot->GetDictBy("RoleMap"); +} +CPDF_StructTreeImpl::~CPDF_StructTreeImpl() { + for (int i = 0; i < m_Kids.GetSize(); i++) + if (m_Kids[i]) { + m_Kids[i]->Release(); + } +} +void CPDF_StructTreeImpl::LoadDocTree() { + m_pPage = nullptr; + if (!m_pTreeRoot) + return; + + CPDF_Object* pKids = m_pTreeRoot->GetElementValue("K"); + if (!pKids) + return; + if (CPDF_Dictionary* pDict = pKids->AsDictionary()) { + CPDF_StructElementImpl* pStructElementImpl = + new CPDF_StructElementImpl(this, nullptr, pDict); + m_Kids.Add(pStructElementImpl); + return; + } + CPDF_Array* pArray = pKids->AsArray(); + if (!pArray) + return; + + for (FX_DWORD i = 0; i < pArray->GetCount(); i++) { + CPDF_Dictionary* pKid = pArray->GetDictAt(i); + CPDF_StructElementImpl* pStructElementImpl = + new CPDF_StructElementImpl(this, nullptr, pKid); + m_Kids.Add(pStructElementImpl); + } +} +void CPDF_StructTreeImpl::LoadPageTree(const CPDF_Dictionary* pPageDict) { + m_pPage = pPageDict; + if (!m_pTreeRoot) + return; + + CPDF_Object* pKids = m_pTreeRoot->GetElementValue("K"); + if (!pKids) + return; + + FX_DWORD dwKids = 0; + if (pKids->IsDictionary()) + dwKids = 1; + else if (CPDF_Array* pArray = pKids->AsArray()) + dwKids = pArray->GetCount(); + else + return; + + FX_DWORD i; + m_Kids.SetSize(dwKids); + for (i = 0; i < dwKids; i++) { + m_Kids[i] = NULL; + } + std::map<CPDF_Dictionary*, CPDF_StructElementImpl*> element_map; + CPDF_Dictionary* pParentTree = m_pTreeRoot->GetDictBy("ParentTree"); + if (!pParentTree) { + return; + } + CPDF_NumberTree parent_tree(pParentTree); + int parents_id = pPageDict->GetIntegerBy("StructParents", -1); + if (parents_id >= 0) { + CPDF_Array* pParentArray = ToArray(parent_tree.LookupValue(parents_id)); + if (!pParentArray) + return; + + for (i = 0; i < pParentArray->GetCount(); i++) { + CPDF_Dictionary* pParent = pParentArray->GetDictAt(i); + if (!pParent) { + continue; + } + AddPageNode(pParent, element_map); + } + } +} +CPDF_StructElementImpl* CPDF_StructTreeImpl::AddPageNode( + CPDF_Dictionary* pDict, + std::map<CPDF_Dictionary*, CPDF_StructElementImpl*>& map, + int nLevel) { + if (nLevel > nMaxRecursion) + return NULL; + + auto it = map.find(pDict); + if (it != map.end()) + return it->second; + + CPDF_StructElementImpl* pElement = + new CPDF_StructElementImpl(this, NULL, pDict); + map[pDict] = pElement; + CPDF_Dictionary* pParent = pDict->GetDictBy("P"); + if (!pParent || pParent->GetStringBy("Type") == "StructTreeRoot") { + if (!AddTopLevelNode(pDict, pElement)) { + pElement->Release(); + map.erase(pDict); + } + } else { + CPDF_StructElementImpl* pParentElement = + AddPageNode(pParent, map, nLevel + 1); + FX_BOOL bSave = FALSE; + for (int i = 0; i < pParentElement->m_Kids.GetSize(); i++) { + if (pParentElement->m_Kids[i].m_Type != CPDF_StructKid::Element) { + continue; + } + if (pParentElement->m_Kids[i].m_Element.m_pDict != pDict) { + continue; + } + pParentElement->m_Kids[i].m_Element.m_pElement = pElement->Retain(); + bSave = TRUE; + } + if (!bSave) { + pElement->Release(); + map.erase(pDict); + } + } + return pElement; +} +FX_BOOL CPDF_StructTreeImpl::AddTopLevelNode(CPDF_Dictionary* pDict, + CPDF_StructElementImpl* pElement) { + CPDF_Object* pObj = m_pTreeRoot->GetElementValue("K"); + if (!pObj) { + return FALSE; + } + if (pObj->IsDictionary()) { + if (pObj->GetObjNum() == pDict->GetObjNum()) { + if (m_Kids[0]) { + m_Kids[0]->Release(); + } + m_Kids[0] = pElement->Retain(); + } else { + return FALSE; + } + } + if (CPDF_Array* pTopKids = pObj->AsArray()) { + FX_DWORD i; + FX_BOOL bSave = FALSE; + for (i = 0; i < pTopKids->GetCount(); i++) { + CPDF_Reference* pKidRef = ToReference(pTopKids->GetElement(i)); + if (!pKidRef) + continue; + if (pKidRef->GetRefObjNum() != pDict->GetObjNum()) + continue; + + if (m_Kids[i]) + m_Kids[i]->Release(); + m_Kids[i] = pElement->Retain(); + bSave = TRUE; + } + if (!bSave) + return FALSE; + } + return TRUE; +} +CPDF_StructElementImpl::CPDF_StructElementImpl(CPDF_StructTreeImpl* pTree, + CPDF_StructElementImpl* pParent, + CPDF_Dictionary* pDict) + : m_RefCount(0) { + m_pTree = pTree; + m_pDict = pDict; + m_Type = pDict->GetStringBy("S"); + if (pTree->m_pRoleMap) { + CFX_ByteString mapped = pTree->m_pRoleMap->GetStringBy(m_Type); + if (!mapped.IsEmpty()) { + m_Type = mapped; + } + } + m_pParent = pParent; + LoadKids(pDict); +} +CPDF_StructElementImpl::~CPDF_StructElementImpl() { + for (int i = 0; i < m_Kids.GetSize(); i++) { + if (m_Kids[i].m_Type == CPDF_StructKid::Element && + m_Kids[i].m_Element.m_pElement) { + ((CPDF_StructElementImpl*)m_Kids[i].m_Element.m_pElement)->Release(); + } + } +} +CPDF_StructElementImpl* CPDF_StructElementImpl::Retain() { + m_RefCount++; + return this; +} +void CPDF_StructElementImpl::Release() { + if (--m_RefCount < 1) { + delete this; + } +} +void CPDF_StructElementImpl::LoadKids(CPDF_Dictionary* pDict) { + CPDF_Object* pObj = pDict->GetElement("Pg"); + FX_DWORD PageObjNum = 0; + if (CPDF_Reference* pRef = ToReference(pObj)) + PageObjNum = pRef->GetRefObjNum(); + + CPDF_Object* pKids = pDict->GetElementValue("K"); + if (!pKids) + return; + + if (CPDF_Array* pArray = pKids->AsArray()) { + m_Kids.SetSize(pArray->GetCount()); + for (FX_DWORD i = 0; i < pArray->GetCount(); i++) { + CPDF_Object* pKid = pArray->GetElementValue(i); + LoadKid(PageObjNum, pKid, &m_Kids[i]); + } + } else { + m_Kids.SetSize(1); + LoadKid(PageObjNum, pKids, &m_Kids[0]); + } +} +void CPDF_StructElementImpl::LoadKid(FX_DWORD PageObjNum, + CPDF_Object* pKidObj, + CPDF_StructKid* pKid) { + pKid->m_Type = CPDF_StructKid::Invalid; + if (!pKidObj) + return; + + if (pKidObj->IsNumber()) { + if (m_pTree->m_pPage && m_pTree->m_pPage->GetObjNum() != PageObjNum) { + return; + } + pKid->m_Type = CPDF_StructKid::PageContent; + pKid->m_PageContent.m_ContentId = pKidObj->GetInteger(); + pKid->m_PageContent.m_PageObjNum = PageObjNum; + return; + } + + CPDF_Dictionary* pKidDict = pKidObj->AsDictionary(); + if (!pKidDict) + return; + + if (CPDF_Reference* pRef = ToReference(pKidDict->GetElement("Pg"))) + PageObjNum = pRef->GetRefObjNum(); + + CFX_ByteString type = pKidDict->GetStringBy("Type"); + if (type == "MCR") { + if (m_pTree->m_pPage && m_pTree->m_pPage->GetObjNum() != PageObjNum) { + return; + } + pKid->m_Type = CPDF_StructKid::StreamContent; + if (CPDF_Reference* pRef = ToReference(pKidDict->GetElement("Stm"))) { + pKid->m_StreamContent.m_RefObjNum = pRef->GetRefObjNum(); + } else { + pKid->m_StreamContent.m_RefObjNum = 0; + } + pKid->m_StreamContent.m_PageObjNum = PageObjNum; + pKid->m_StreamContent.m_ContentId = pKidDict->GetIntegerBy("MCID"); + } else if (type == "OBJR") { + if (m_pTree->m_pPage && m_pTree->m_pPage->GetObjNum() != PageObjNum) { + return; + } + pKid->m_Type = CPDF_StructKid::Object; + if (CPDF_Reference* pObj = ToReference(pKidDict->GetElement("Obj"))) { + pKid->m_Object.m_RefObjNum = pObj->GetRefObjNum(); + } else { + pKid->m_Object.m_RefObjNum = 0; + } + pKid->m_Object.m_PageObjNum = PageObjNum; + } else { + pKid->m_Type = CPDF_StructKid::Element; + pKid->m_Element.m_pDict = pKidDict; + if (!m_pTree->m_pPage) { + pKid->m_Element.m_pElement = + new CPDF_StructElementImpl(m_pTree, this, pKidDict); + } else { + pKid->m_Element.m_pElement = NULL; + } + } +} +static CPDF_Dictionary* FindAttrDict(CPDF_Object* pAttrs, + const CFX_ByteStringC& owner, + FX_FLOAT nLevel = 0.0F) { + if (nLevel > nMaxRecursion) + return nullptr; + if (!pAttrs) + return nullptr; + + CPDF_Dictionary* pDict = nullptr; + if (pAttrs->IsDictionary()) { + pDict = pAttrs->AsDictionary(); + } else if (CPDF_Stream* pStream = pAttrs->AsStream()) { + pDict = pStream->GetDict(); + } else if (CPDF_Array* pArray = pAttrs->AsArray()) { + for (FX_DWORD i = 0; i < pArray->GetCount(); i++) { + CPDF_Object* pElement = pArray->GetElementValue(i); + pDict = FindAttrDict(pElement, owner, nLevel + 1); + if (pDict) + return pDict; + } + } + if (pDict && pDict->GetStringBy("O") == owner) + return pDict; + return nullptr; +} +CPDF_Object* CPDF_StructElementImpl::GetAttr(const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + FX_BOOL bInheritable, + FX_FLOAT fLevel) { + if (fLevel > nMaxRecursion) { + return NULL; + } + if (bInheritable) { + CPDF_Object* pAttr = GetAttr(owner, name, FALSE); + if (pAttr) { + return pAttr; + } + if (!m_pParent) { + return NULL; + } + return m_pParent->GetAttr(owner, name, TRUE, fLevel + 1); + } + CPDF_Object* pA = m_pDict->GetElementValue("A"); + if (pA) { + CPDF_Dictionary* pAttrDict = FindAttrDict(pA, owner); + if (pAttrDict) { + CPDF_Object* pAttr = pAttrDict->GetElementValue(name); + if (pAttr) { + return pAttr; + } + } + } + CPDF_Object* pC = m_pDict->GetElementValue("C"); + if (!pC) + return nullptr; + + CPDF_Dictionary* pClassMap = m_pTree->m_pTreeRoot->GetDictBy("ClassMap"); + if (!pClassMap) + return nullptr; + + if (CPDF_Array* pArray = pC->AsArray()) { + for (FX_DWORD i = 0; i < pArray->GetCount(); i++) { + CFX_ByteString class_name = pArray->GetStringAt(i); + CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name); + if (pClassDict && pClassDict->GetStringBy("O") == owner) + return pClassDict->GetElementValue(name); + } + return nullptr; + } + CFX_ByteString class_name = pC->GetString(); + CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name); + if (pClassDict && pClassDict->GetStringBy("O") == owner) + return pClassDict->GetElementValue(name); + return nullptr; +} +CPDF_Object* CPDF_StructElementImpl::GetAttr(const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + FX_BOOL bInheritable, + int subindex) { + CPDF_Object* pAttr = GetAttr(owner, name, bInheritable); + CPDF_Array* pArray = ToArray(pAttr); + if (!pArray || subindex == -1) + return pAttr; + + if (subindex >= static_cast<int>(pArray->GetCount())) + return pAttr; + return pArray->GetElementValue(subindex); +} +CFX_ByteString CPDF_StructElementImpl::GetName( + const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + const CFX_ByteStringC& default_value, + FX_BOOL bInheritable, + int subindex) { + CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex); + if (ToName(pAttr)) + return pAttr->GetString(); + return default_value; +} + +FX_ARGB CPDF_StructElementImpl::GetColor(const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + FX_ARGB default_value, + FX_BOOL bInheritable, + int subindex) { + CPDF_Array* pArray = ToArray(GetAttr(owner, name, bInheritable, subindex)); + if (!pArray) + return default_value; + return 0xff000000 | ((int)(pArray->GetNumberAt(0) * 255) << 16) | + ((int)(pArray->GetNumberAt(1) * 255) << 8) | + (int)(pArray->GetNumberAt(2) * 255); +} +FX_FLOAT CPDF_StructElementImpl::GetNumber(const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + FX_FLOAT default_value, + FX_BOOL bInheritable, + int subindex) { + CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex); + return ToNumber(pAttr) ? pAttr->GetNumber() : default_value; +} +int CPDF_StructElementImpl::GetInteger(const CFX_ByteStringC& owner, + const CFX_ByteStringC& name, + int default_value, + FX_BOOL bInheritable, + int subindex) { + CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex); + return ToNumber(pAttr) ? pAttr->GetInteger() : default_value; +} |