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// Copyright 2017 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/fxcrt/xml/cfx_saxreaderhandler.h"
#include <string>
#include "core/fxcrt/cfx_checksumcontext.h"
CFX_SAXReaderHandler::CFX_SAXReaderHandler(CFX_ChecksumContext* pContext)
: m_pContext(pContext) {
ASSERT(m_pContext);
}
CFX_SAXReaderHandler::~CFX_SAXReaderHandler() {}
CFX_SAXContext* CFX_SAXReaderHandler::OnTagEnter(
const ByteStringView& bsTagName,
CFX_SAXItem::Type eType,
uint32_t dwStartPos) {
UpdateChecksum(true);
if (eType != CFX_SAXItem::Type::Tag &&
eType != CFX_SAXItem::Type::Instruction) {
return nullptr;
}
m_SAXContext.m_eNode = eType;
m_SAXContext.m_TextBuf << "<";
if (eType == CFX_SAXItem::Type::Instruction)
m_SAXContext.m_TextBuf << "?";
m_SAXContext.m_TextBuf << bsTagName;
m_SAXContext.m_bsTagName = bsTagName;
return &m_SAXContext;
}
void CFX_SAXReaderHandler::OnTagAttribute(CFX_SAXContext* pTag,
const ByteStringView& bsAttri,
const ByteStringView& bsValue) {
if (!pTag)
return;
pTag->m_TextBuf << " " << bsAttri << "=\"" << bsValue << "\"";
}
void CFX_SAXReaderHandler::OnTagBreak(CFX_SAXContext* pTag) {
if (!pTag)
return;
pTag->m_TextBuf << ">";
UpdateChecksum(false);
}
void CFX_SAXReaderHandler::OnTagData(CFX_SAXContext* pTag,
CFX_SAXItem::Type eType,
const ByteStringView& bsData,
uint32_t dwStartPos) {
if (!pTag)
return;
if (eType == CFX_SAXItem::Type::CharData)
pTag->m_TextBuf << "<![CDATA[";
pTag->m_TextBuf << bsData;
if (eType == CFX_SAXItem::Type::CharData)
pTag->m_TextBuf << "]]>";
}
void CFX_SAXReaderHandler::OnTagClose(CFX_SAXContext* pTag, uint32_t dwEndPos) {
if (!pTag)
return;
if (pTag->m_eNode == CFX_SAXItem::Type::Instruction)
pTag->m_TextBuf << "?>";
else if (pTag->m_eNode == CFX_SAXItem::Type::Tag)
pTag->m_TextBuf << "></" << pTag->m_bsTagName.AsStringView() << ">";
UpdateChecksum(false);
}
void CFX_SAXReaderHandler::OnTagEnd(CFX_SAXContext* pTag,
const ByteStringView& bsTagName,
uint32_t dwEndPos) {
if (!pTag)
return;
pTag->m_TextBuf << "</" << bsTagName << ">";
UpdateChecksum(false);
}
void CFX_SAXReaderHandler::OnTargetData(CFX_SAXContext* pTag,
CFX_SAXItem::Type eType,
const ByteStringView& bsData,
uint32_t dwStartPos) {
if (!pTag && eType != CFX_SAXItem::Type::Comment)
return;
if (eType == CFX_SAXItem::Type::Comment) {
m_SAXContext.m_TextBuf << "<!--" << bsData << "-->";
UpdateChecksum(false);
} else {
pTag->m_TextBuf << " " << bsData;
}
}
void CFX_SAXReaderHandler::UpdateChecksum(bool bCheckSpace) {
int32_t iLength = m_SAXContext.m_TextBuf.tellp();
if (iLength < 1)
return;
std::string sBuffer = m_SAXContext.m_TextBuf.str();
const uint8_t* pBuffer = reinterpret_cast<const uint8_t*>(sBuffer.c_str());
bool bUpdata = true;
if (bCheckSpace) {
bUpdata = false;
for (int32_t i = 0; i < iLength; i++) {
bUpdata = (pBuffer[i] > 0x20);
if (bUpdata)
break;
}
}
if (bUpdata)
m_pContext->Update(ByteStringView(pBuffer, iLength));
m_SAXContext.m_TextBuf.str("");
}
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