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// 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 "core/fpdfapi/parser/cfdf_document.h"
#include <memory>
#include <sstream>
#include <utility>
#include "core/fpdfapi/edit/cpdf_creator.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_syntax_parser.h"
#include "core/fpdfapi/parser/fpdf_parser_utility.h"
#include "core/fxcrt/cfx_memorystream.h"
#include "third_party/base/ptr_util.h"
CFDF_Document::CFDF_Document()
: CPDF_IndirectObjectHolder(), m_pRootDict(nullptr) {}
CFDF_Document::~CFDF_Document() {}
std::unique_ptr<CFDF_Document> CFDF_Document::CreateNewDoc() {
auto pDoc = pdfium::MakeUnique<CFDF_Document>();
pDoc->m_pRootDict = pDoc->NewIndirect<CPDF_Dictionary>();
pDoc->m_pRootDict->SetNewFor<CPDF_Dictionary>("FDF");
return pDoc;
}
std::unique_ptr<CFDF_Document> CFDF_Document::ParseFile(
const RetainPtr<IFX_SeekableReadStream>& pFile) {
if (!pFile)
return nullptr;
auto pDoc = pdfium::MakeUnique<CFDF_Document>();
pDoc->ParseStream(pFile);
return pDoc->m_pRootDict ? std::move(pDoc) : nullptr;
}
std::unique_ptr<CFDF_Document> CFDF_Document::ParseMemory(uint8_t* pData,
uint32_t size) {
return CFDF_Document::ParseFile(
pdfium::MakeRetain<CFX_MemoryStream>(pData, size, false));
}
void CFDF_Document::ParseStream(
const RetainPtr<IFX_SeekableReadStream>& pFile) {
m_pFile = pFile;
CPDF_SyntaxParser parser;
parser.InitParser(m_pFile, 0);
while (1) {
bool bNumber;
ByteString word = parser.GetNextWord(&bNumber);
if (bNumber) {
uint32_t objnum = FXSYS_atoui(word.c_str());
if (!objnum)
break;
word = parser.GetNextWord(&bNumber);
if (!bNumber)
break;
word = parser.GetNextWord(nullptr);
if (word != "obj")
break;
std::unique_ptr<CPDF_Object> pObj =
parser.GetObject(this, objnum, 0, false);
if (!pObj)
break;
ReplaceIndirectObjectIfHigherGeneration(objnum, std::move(pObj));
word = parser.GetNextWord(nullptr);
if (word != "endobj")
break;
} else {
if (word != "trailer")
break;
std::unique_ptr<CPDF_Dictionary> pMainDict =
ToDictionary(parser.GetObject(this, 0, 0, false));
if (pMainDict)
m_pRootDict = pMainDict->GetDictFor("Root");
break;
}
}
}
ByteString CFDF_Document::WriteToString() const {
if (!m_pRootDict)
return ByteString();
std::ostringstream buf;
buf << "%FDF-1.2\r\n";
for (const auto& pair : *this)
buf << pair.first << " 0 obj\r\n"
<< pair.second.get() << "\r\nendobj\r\n\r\n";
buf << "trailer\r\n<</Root " << m_pRootDict->GetObjNum()
<< " 0 R>>\r\n%%EOF\r\n";
return ByteString(buf);
}
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