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// 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 "xfa/fde/xml/cfde_xmlparser.h"
#include "core/fxcrt/fx_basic.h"
#include "third_party/base/ptr_util.h"
#include "xfa/fde/xml/cfde_xmlchardata.h"
#include "xfa/fde/xml/cfde_xmlelement.h"
#include "xfa/fde/xml/cfde_xmlinstruction.h"
#include "xfa/fde/xml/cfde_xmlnode.h"
#include "xfa/fde/xml/cfde_xmltext.h"
CFDE_XMLParser::CFDE_XMLParser(CFDE_XMLNode* pParent,
const CFX_RetainPtr<IFGAS_Stream>& pStream)
: m_nElementStart(0),
m_dwCheckStatus(0),
m_dwCurrentCheckStatus(0),
m_pStream(pStream),
m_pParser(pdfium::MakeUnique<CFDE_XMLSyntaxParser>()),
m_pParent(pParent),
m_pChild(nullptr),
m_syntaxParserResult(FDE_XmlSyntaxResult::None) {
ASSERT(m_pParent && m_pStream);
m_NodeStack.push(m_pParent);
m_pParser->Init(m_pStream, 32 * 1024);
}
CFDE_XMLParser::~CFDE_XMLParser() {}
int32_t CFDE_XMLParser::DoParser(IFX_Pause* pPause) {
if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error)
return -1;
if (m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString)
return 100;
int32_t iCount = 0;
while (true) {
m_syntaxParserResult = m_pParser->DoSyntaxParse();
switch (m_syntaxParserResult) {
case FDE_XmlSyntaxResult::InstructionOpen:
break;
case FDE_XmlSyntaxResult::InstructionClose:
if (m_pChild) {
if (m_pChild->GetType() != FDE_XMLNODE_Instruction) {
m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
break;
}
}
m_pChild = m_pParent;
break;
case FDE_XmlSyntaxResult::ElementOpen:
if (m_dwCheckStatus != 0x03 && m_NodeStack.size() == 2)
m_nElementStart = m_pParser->GetCurrentPos() - 1;
break;
case FDE_XmlSyntaxResult::ElementBreak:
break;
case FDE_XmlSyntaxResult::ElementClose:
if (m_pChild->GetType() != FDE_XMLNODE_Element) {
m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
break;
}
m_ws1 = m_pParser->GetTagName();
m_ws2 = static_cast<CFDE_XMLElement*>(m_pChild)->GetName();
if (m_ws1.GetLength() > 0 && m_ws1 != m_ws2) {
m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
break;
}
if (!m_NodeStack.empty())
m_NodeStack.pop();
if (m_NodeStack.empty()) {
m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
break;
} else if (m_dwCurrentCheckStatus != 0 && m_NodeStack.size() == 2) {
m_nSize[m_dwCurrentCheckStatus - 1] =
m_pParser->GetCurrentBinaryPos() -
m_nStart[m_dwCurrentCheckStatus - 1];
m_dwCurrentCheckStatus = 0;
}
m_pParent = m_NodeStack.top();
m_pChild = m_pParent;
iCount++;
break;
case FDE_XmlSyntaxResult::TargetName:
m_ws1 = m_pParser->GetTargetName();
if (m_ws1 == L"originalXFAVersion" || m_ws1 == L"acrobat") {
m_pChild = new CFDE_XMLInstruction(m_ws1);
m_pParent->InsertChildNode(m_pChild);
} else {
m_pChild = nullptr;
}
m_ws1.clear();
break;
case FDE_XmlSyntaxResult::TagName:
m_ws1 = m_pParser->GetTagName();
m_pChild = new CFDE_XMLElement(m_ws1);
m_pParent->InsertChildNode(m_pChild);
m_NodeStack.push(m_pChild);
m_pParent = m_pChild;
if (m_dwCheckStatus != 0x03 && m_NodeStack.size() == 3) {
CFX_WideString wsTag =
static_cast<CFDE_XMLElement*>(m_pChild)->GetLocalTagName();
if (wsTag == L"template") {
m_dwCheckStatus |= 0x01;
m_dwCurrentCheckStatus = 0x01;
m_nStart[0] = m_pParser->GetCurrentBinaryPos() -
(m_pParser->GetCurrentPos() - m_nElementStart);
} else if (wsTag == L"datasets") {
m_dwCheckStatus |= 0x02;
m_dwCurrentCheckStatus = 0x02;
m_nStart[1] = m_pParser->GetCurrentBinaryPos() -
(m_pParser->GetCurrentPos() - m_nElementStart);
}
}
break;
case FDE_XmlSyntaxResult::AttriName:
m_ws1 = m_pParser->GetAttributeName();
break;
case FDE_XmlSyntaxResult::AttriValue:
if (m_pChild) {
m_ws2 = m_pParser->GetAttributeName();
if (m_pChild->GetType() == FDE_XMLNODE_Element)
static_cast<CFDE_XMLElement*>(m_pChild)->SetString(m_ws1, m_ws2);
}
m_ws1.clear();
break;
case FDE_XmlSyntaxResult::Text:
m_ws1 = m_pParser->GetTextData();
m_pChild = new CFDE_XMLText(m_ws1);
m_pParent->InsertChildNode(m_pChild);
m_pChild = m_pParent;
break;
case FDE_XmlSyntaxResult::CData:
m_ws1 = m_pParser->GetTextData();
m_pChild = new CFDE_XMLCharData(m_ws1);
m_pParent->InsertChildNode(m_pChild);
m_pChild = m_pParent;
break;
case FDE_XmlSyntaxResult::TargetData:
if (m_pChild) {
if (m_pChild->GetType() != FDE_XMLNODE_Instruction) {
m_syntaxParserResult = FDE_XmlSyntaxResult::Error;
break;
}
auto* instruction = static_cast<CFDE_XMLInstruction*>(m_pChild);
if (!m_ws1.IsEmpty())
instruction->AppendData(m_ws1);
instruction->AppendData(m_pParser->GetTargetData());
}
m_ws1.clear();
break;
default:
break;
}
if (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
m_syntaxParserResult == FDE_XmlSyntaxResult::EndOfString) {
break;
}
if (pPause && iCount > 500 && pPause->NeedToPauseNow()) {
break;
}
}
return (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
m_NodeStack.size() != 1)
? -1
: m_pParser->GetStatus();
}
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