Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser

BUG=pdfium:603

Review-Url: https://codereview.chromium.org/2392603004

1 files changed, 0 insertions, 1844 deletions

diff --git a/core/fpdfapi/fpdf_parser/cpdf_data_avail.cpp b/core/fpdfapi/fpdf_parser/cpdf_data_avail.cpp
deleted file mode 100644
index 9afe4e5f13..0000000000
--- a/core/fpdfapi/fpdf_parser/cpdf_data_avail.cpp
+++ /dev/null
@@ -1,1844 +0,0 @@
-// 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 "core/fpdfapi/fpdf_parser/cpdf_data_avail.h"
-
-#include <algorithm>
-#include <memory>
-#include <utility>
-
-#include "core/fpdfapi/cpdf_modulemgr.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_array.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_document.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_hint_tables.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_name.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_number.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_reference.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream.h"
-#include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
-#include "core/fxcrt/fx_ext.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/stl_util.h"
-
-CPDF_DataAvail::FileAvail::~FileAvail() {}
-
-CPDF_DataAvail::DownloadHints::~DownloadHints() {}
-
-// static
-int CPDF_DataAvail::s_CurrentDataAvailRecursionDepth = 0;
-
-CPDF_DataAvail::CPDF_DataAvail(FileAvail* pFileAvail,
-                               IFX_FileRead* pFileRead,
-                               FX_BOOL bSupportHintTable)
-    : m_pFileAvail(pFileAvail), m_pFileRead(pFileRead) {
-  m_Pos = 0;
-  m_dwFileLen = 0;
-  if (m_pFileRead) {
-    m_dwFileLen = (uint32_t)m_pFileRead->GetSize();
-  }
-  m_dwCurrentOffset = 0;
-  m_dwXRefOffset = 0;
-  m_bufferOffset = 0;
-  m_dwFirstPageNo = 0;
-  m_bufferSize = 0;
-  m_PagesObjNum = 0;
-  m_dwCurrentXRefSteam = 0;
-  m_dwAcroFormObjNum = 0;
-  m_dwInfoObjNum = 0;
-  m_pDocument = 0;
-  m_dwEncryptObjNum = 0;
-  m_dwPrevXRefOffset = 0;
-  m_dwLastXRefOffset = 0;
-  m_bDocAvail = FALSE;
-  m_bMainXRefLoadTried = FALSE;
-  m_bDocAvail = FALSE;
-  m_bLinearized = FALSE;
-  m_bPagesLoad = FALSE;
-  m_bPagesTreeLoad = FALSE;
-  m_bMainXRefLoadedOK = FALSE;
-  m_bAnnotsLoad = FALSE;
-  m_bHaveAcroForm = FALSE;
-  m_bAcroFormLoad = FALSE;
-  m_bPageLoadedOK = FALSE;
-  m_bNeedDownLoadResource = FALSE;
-  m_bLinearizedFormParamLoad = FALSE;
-  m_pLinearized = nullptr;
-  m_pRoot = nullptr;
-  m_pTrailer = nullptr;
-  m_pCurrentParser = nullptr;
-  m_pAcroForm = nullptr;
-  m_pPageDict = nullptr;
-  m_pPageResource = nullptr;
-  m_docStatus = PDF_DATAAVAIL_HEADER;
-  m_parser.m_bOwnFileRead = false;
-  m_bTotalLoadPageTree = FALSE;
-  m_bCurPageDictLoadOK = FALSE;
-  m_bLinearedDataOK = FALSE;
-  m_bSupportHintTable = bSupportHintTable;
-}
-CPDF_DataAvail::~CPDF_DataAvail() {
-  m_pHintTables.reset();
-  if (m_pLinearized)
-    m_pLinearized->Release();
-
-  if (m_pRoot)
-    m_pRoot->Release();
-
-  if (m_pTrailer)
-    m_pTrailer->Release();
-
-  int iSize = m_arrayAcroforms.GetSize();
-  for (int i = 0; i < iSize; ++i)
-    m_arrayAcroforms.GetAt(i)->Release();
-}
-
-void CPDF_DataAvail::SetDocument(CPDF_Document* pDoc) {
-  m_pDocument = pDoc;
-}
-
-uint32_t CPDF_DataAvail::GetObjectSize(uint32_t objnum, FX_FILESIZE& offset) {
-  CPDF_Parser* pParser = m_pDocument->GetParser();
-  if (!pParser || !pParser->IsValidObjectNumber(objnum))
-    return 0;
-
-  if (pParser->GetObjectType(objnum) == 2)
-    objnum = pParser->GetObjectPositionOrZero(objnum);
-
-  if (pParser->GetObjectType(objnum) != 1 &&
-      pParser->GetObjectType(objnum) != 255) {
-    return 0;
-  }
-
-  offset = pParser->GetObjectPositionOrZero(objnum);
-  if (offset == 0)
-    return 0;
-
-  auto it = pParser->m_SortedOffset.find(offset);
-  if (it == pParser->m_SortedOffset.end() ||
-      ++it == pParser->m_SortedOffset.end()) {
-    return 0;
-  }
-  return *it - offset;
-}
-
-FX_BOOL CPDF_DataAvail::IsObjectsAvail(
-    CFX_ArrayTemplate<CPDF_Object*>& obj_array,
-    FX_BOOL bParsePage,
-    DownloadHints* pHints,
-    CFX_ArrayTemplate<CPDF_Object*>& ret_array) {
-  if (!obj_array.GetSize())
-    return TRUE;
-
-  uint32_t count = 0;
-  CFX_ArrayTemplate<CPDF_Object*> new_obj_array;
-  for (int i = 0; i < obj_array.GetSize(); i++) {
-    CPDF_Object* pObj = obj_array[i];
-    if (!pObj)
-      continue;
-
-    int32_t type = pObj->GetType();
-    switch (type) {
-      case CPDF_Object::ARRAY: {
-        CPDF_Array* pArray = pObj->AsArray();
-        for (size_t k = 0; k < pArray->GetCount(); ++k)
-          new_obj_array.Add(pArray->GetObjectAt(k));
-      } break;
-      case CPDF_Object::STREAM:
-        pObj = pObj->GetDict();
-      case CPDF_Object::DICTIONARY: {
-        CPDF_Dictionary* pDict = pObj->GetDict();
-        if (pDict && pDict->GetStringFor("Type") == "Page" && !bParsePage)
-          continue;
-
-        for (const auto& it : *pDict) {
-          const CFX_ByteString& key = it.first;
-          CPDF_Object* value = it.second;
-          if (key != "Parent")
-            new_obj_array.Add(value);
-        }
-      } break;
-      case CPDF_Object::REFERENCE: {
-        CPDF_Reference* pRef = pObj->AsReference();
-        uint32_t dwNum = pRef->GetRefObjNum();
-
-        FX_FILESIZE offset;
-        uint32_t size = GetObjectSize(dwNum, offset);
-        if (size == 0 || offset < 0 || offset >= m_dwFileLen)
-          break;
-
-        if (!IsDataAvail(offset, size, pHints)) {
-          ret_array.Add(pObj);
-          count++;
-        } else if (!pdfium::ContainsKey(m_ObjectSet, dwNum)) {
-          m_ObjectSet.insert(dwNum);
-          CPDF_Object* pReferred =
-              m_pDocument->GetOrParseIndirectObject(pRef->GetRefObjNum());
-          if (pReferred)
-            new_obj_array.Add(pReferred);
-        }
-      } break;
-    }
-  }
-
-  if (count > 0) {
-    for (int i = 0; i < new_obj_array.GetSize(); ++i) {
-      CPDF_Object* pObj = new_obj_array[i];
-      if (CPDF_Reference* pRef = pObj->AsReference()) {
-        uint32_t dwNum = pRef->GetRefObjNum();
-        if (!pdfium::ContainsKey(m_ObjectSet, dwNum))
-          ret_array.Add(pObj);
-      } else {
-        ret_array.Add(pObj);
-      }
-    }
-    return FALSE;
-  }
-
-  obj_array.RemoveAll();
-  obj_array.Append(new_obj_array);
-  return IsObjectsAvail(obj_array, FALSE, pHints, ret_array);
-}
-
-CPDF_DataAvail::DocAvailStatus CPDF_DataAvail::IsDocAvail(
-    DownloadHints* pHints) {
-  if (!m_dwFileLen && m_pFileRead) {
-    m_dwFileLen = (uint32_t)m_pFileRead->GetSize();
-    if (!m_dwFileLen)
-      return DataError;
-  }
-
-  while (!m_bDocAvail) {
-    if (!CheckDocStatus(pHints))
-      return DataNotAvailable;
-  }
-
-  return DataAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckAcroFormSubObject(DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    m_ObjectSet.clear();
-    CFX_ArrayTemplate<CPDF_Object*> obj_array;
-    obj_array.Append(m_arrayAcroforms);
-    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
-    if (bRet)
-      m_objs_array.RemoveAll();
-    return bRet;
-  }
-
-  CFX_ArrayTemplate<CPDF_Object*> new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  if (bRet) {
-    int32_t iSize = m_arrayAcroforms.GetSize();
-    for (int32_t i = 0; i < iSize; ++i) {
-      m_arrayAcroforms.GetAt(i)->Release();
-    }
-    m_arrayAcroforms.RemoveAll();
-  } else {
-    m_objs_array.RemoveAll();
-    m_objs_array.Append(new_objs_array);
-  }
-  return bRet;
-}
-
-FX_BOOL CPDF_DataAvail::CheckAcroForm(DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  m_pAcroForm = GetObject(m_dwAcroFormObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_PAGETREE;
-    return TRUE;
-  }
-
-  if (!m_pAcroForm) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-
-  m_arrayAcroforms.Add(m_pAcroForm);
-  m_docStatus = PDF_DATAAVAIL_PAGETREE;
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckDocStatus(DownloadHints* pHints) {
-  switch (m_docStatus) {
-    case PDF_DATAAVAIL_HEADER:
-      return CheckHeader(pHints);
-    case PDF_DATAAVAIL_FIRSTPAGE:
-    case PDF_DATAAVAIL_FIRSTPAGE_PREPARE:
-      return CheckFirstPage(pHints);
-    case PDF_DATAAVAIL_HINTTABLE:
-      return CheckHintTables(pHints);
-    case PDF_DATAAVAIL_END:
-      return CheckEnd(pHints);
-    case PDF_DATAAVAIL_CROSSREF:
-      return CheckCrossRef(pHints);
-    case PDF_DATAAVAIL_CROSSREF_ITEM:
-      return CheckCrossRefItem(pHints);
-    case PDF_DATAAVAIL_CROSSREF_STREAM:
-      return CheckAllCrossRefStream(pHints);
-    case PDF_DATAAVAIL_TRAILER:
-      return CheckTrailer(pHints);
-    case PDF_DATAAVAIL_TRAILER_APPEND:
-      return CheckTrailerAppend(pHints);
-    case PDF_DATAAVAIL_LOADALLCROSSREF:
-      return LoadAllXref(pHints);
-    case PDF_DATAAVAIL_LOADALLFILE:
-      return LoadAllFile(pHints);
-    case PDF_DATAAVAIL_ROOT:
-      return CheckRoot(pHints);
-    case PDF_DATAAVAIL_INFO:
-      return CheckInfo(pHints);
-    case PDF_DATAAVAIL_ACROFORM:
-      return CheckAcroForm(pHints);
-    case PDF_DATAAVAIL_PAGETREE:
-      if (m_bTotalLoadPageTree)
-        return CheckPages(pHints);
-      return LoadDocPages(pHints);
-    case PDF_DATAAVAIL_PAGE:
-      if (m_bTotalLoadPageTree)
-        return CheckPage(pHints);
-      m_docStatus = PDF_DATAAVAIL_PAGE_LATERLOAD;
-      return TRUE;
-    case PDF_DATAAVAIL_ERROR:
-      return LoadAllFile(pHints);
-    case PDF_DATAAVAIL_PAGE_LATERLOAD:
-      m_docStatus = PDF_DATAAVAIL_PAGE;
-    default:
-      m_bDocAvail = TRUE;
-      return TRUE;
-  }
-}
-
-FX_BOOL CPDF_DataAvail::CheckPageStatus(DownloadHints* pHints) {
-  switch (m_docStatus) {
-    case PDF_DATAAVAIL_PAGETREE:
-      return CheckPages(pHints);
-    case PDF_DATAAVAIL_PAGE:
-      return CheckPage(pHints);
-    case PDF_DATAAVAIL_ERROR:
-      return LoadAllFile(pHints);
-    default:
-      m_bPagesTreeLoad = TRUE;
-      m_bPagesLoad = TRUE;
-      return TRUE;
-  }
-}
-
-FX_BOOL CPDF_DataAvail::LoadAllFile(DownloadHints* pHints) {
-  if (m_pFileAvail->IsDataAvail(0, (uint32_t)m_dwFileLen)) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-
-  pHints->AddSegment(0, (uint32_t)m_dwFileLen);
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::LoadAllXref(DownloadHints* pHints) {
-  m_parser.m_pSyntax->InitParser(m_pFileRead, (uint32_t)m_dwHeaderOffset);
-  m_parser.m_bOwnFileRead = false;
-  if (!m_parser.LoadAllCrossRefV4(m_dwLastXRefOffset) &&
-      !m_parser.LoadAllCrossRefV5(m_dwLastXRefOffset)) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return FALSE;
-  }
-
-  m_dwRootObjNum = m_parser.GetRootObjNum();
-  m_dwInfoObjNum = m_parser.GetInfoObjNum();
-  m_pCurrentParser = &m_parser;
-  m_docStatus = PDF_DATAAVAIL_ROOT;
-  return TRUE;
-}
-
-CPDF_Object* CPDF_DataAvail::GetObject(uint32_t objnum,
-                                       DownloadHints* pHints,
-                                       FX_BOOL* pExistInFile) {
-  CPDF_Object* pRet = nullptr;
-  uint32_t size = 0;
-  FX_FILESIZE offset = 0;
-  CPDF_Parser* pParser = nullptr;
-
-  if (pExistInFile)
-    *pExistInFile = TRUE;
-
-  if (m_pDocument) {
-    size = GetObjectSize(objnum, offset);
-    pParser = m_pDocument->GetParser();
-  } else {
-    size = (uint32_t)m_parser.GetObjectSize(objnum);
-    offset = m_parser.GetObjectOffset(objnum);
-    pParser = &m_parser;
-  }
-
-  if (!IsDataAvail(offset, size, pHints))
-    return nullptr;
-
-  if (pParser)
-    pRet = pParser->ParseIndirectObject(nullptr, objnum);
-
-  if (!pRet && pExistInFile)
-    *pExistInFile = FALSE;
-
-  return pRet;
-}
-
-FX_BOOL CPDF_DataAvail::CheckInfo(DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pInfo = GetObject(m_dwInfoObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus =
-        (m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : PDF_DATAAVAIL_PAGETREE);
-    return TRUE;
-  }
-
-  if (!pInfo) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-
-    if (m_Pos == m_dwFileLen)
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (pInfo)
-    pInfo->Release();
-
-  m_docStatus =
-      (m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : PDF_DATAAVAIL_PAGETREE);
-
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckRoot(DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  m_pRoot = GetObject(m_dwRootObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-
-  if (!m_pRoot) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-
-  CPDF_Dictionary* pDict = m_pRoot->GetDict();
-  if (!pDict) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  CPDF_Reference* pRef = ToReference(pDict->GetObjectFor("Pages"));
-  if (!pRef) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  m_PagesObjNum = pRef->GetRefObjNum();
-  CPDF_Reference* pAcroFormRef =
-      ToReference(m_pRoot->GetDict()->GetObjectFor("AcroForm"));
-  if (pAcroFormRef) {
-    m_bHaveAcroForm = TRUE;
-    m_dwAcroFormObjNum = pAcroFormRef->GetRefObjNum();
-  }
-
-  if (m_dwInfoObjNum) {
-    m_docStatus = PDF_DATAAVAIL_INFO;
-  } else {
-    m_docStatus =
-        m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : PDF_DATAAVAIL_PAGETREE;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::PreparePageItem() {
-  CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
-  CPDF_Reference* pRef =
-      ToReference(pRoot ? pRoot->GetObjectFor("Pages") : nullptr);
-  if (!pRef) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  m_PagesObjNum = pRef->GetRefObjNum();
-  m_pCurrentParser = m_pDocument->GetParser();
-  m_docStatus = PDF_DATAAVAIL_PAGETREE;
-  return TRUE;
-}
-
-bool CPDF_DataAvail::IsFirstCheck(uint32_t dwPage) {
-  return m_pageMapCheckState.insert(dwPage).second;
-}
-
-void CPDF_DataAvail::ResetFirstCheck(uint32_t dwPage) {
-  m_pageMapCheckState.erase(dwPage);
-}
-
-FX_BOOL CPDF_DataAvail::CheckPage(DownloadHints* pHints) {
-  uint32_t iPageObjs = m_PageObjList.GetSize();
-  CFX_ArrayTemplate<uint32_t> UnavailObjList;
-  for (uint32_t i = 0; i < iPageObjs; ++i) {
-    uint32_t dwPageObjNum = m_PageObjList.GetAt(i);
-    FX_BOOL bExist = FALSE;
-    CPDF_Object* pObj = GetObject(dwPageObjNum, pHints, &bExist);
-    if (!pObj) {
-      if (bExist)
-        UnavailObjList.Add(dwPageObjNum);
-      continue;
-    }
-
-    CPDF_Array* pArray = ToArray(pObj);
-    if (pArray) {
-      for (CPDF_Object* pArrayObj : *pArray) {
-        if (CPDF_Reference* pRef = ToReference(pArrayObj))
-          UnavailObjList.Add(pRef->GetRefObjNum());
-      }
-    }
-
-    if (!pObj->IsDictionary()) {
-      pObj->Release();
-      continue;
-    }
-
-    CFX_ByteString type = pObj->GetDict()->GetStringFor("Type");
-    if (type == "Pages") {
-      m_PagesArray.Add(pObj);
-      continue;
-    }
-    pObj->Release();
-  }
-
-  m_PageObjList.RemoveAll();
-  if (UnavailObjList.GetSize()) {
-    m_PageObjList.Append(UnavailObjList);
-    return FALSE;
-  }
-
-  uint32_t iPages = m_PagesArray.GetSize();
-  for (uint32_t i = 0; i < iPages; i++) {
-    CPDF_Object* pPages = m_PagesArray.GetAt(i);
-    if (!pPages)
-      continue;
-
-    if (!GetPageKids(m_pCurrentParser, pPages)) {
-      pPages->Release();
-      while (++i < iPages) {
-        pPages = m_PagesArray.GetAt(i);
-        pPages->Release();
-      }
-      m_PagesArray.RemoveAll();
-
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    pPages->Release();
-  }
-
-  m_PagesArray.RemoveAll();
-  if (!m_PageObjList.GetSize())
-    m_docStatus = PDF_DATAAVAIL_DONE;
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages) {
-  if (!pParser) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  CPDF_Dictionary* pDict = pPages->GetDict();
-  CPDF_Object* pKids = pDict ? pDict->GetObjectFor("Kids") : nullptr;
-  if (!pKids)
-    return TRUE;
-
-  switch (pKids->GetType()) {
-    case CPDF_Object::REFERENCE:
-      m_PageObjList.Add(pKids->AsReference()->GetRefObjNum());
-      break;
-    case CPDF_Object::ARRAY: {
-      CPDF_Array* pKidsArray = pKids->AsArray();
-      for (size_t i = 0; i < pKidsArray->GetCount(); ++i) {
-        if (CPDF_Reference* pRef = ToReference(pKidsArray->GetObjectAt(i)))
-          m_PageObjList.Add(pRef->GetRefObjNum());
-      }
-    } break;
-    default:
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPages(DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-
-  if (!pPages) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-
-  if (!GetPageKids(m_pCurrentParser, pPages)) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  pPages->Release();
-  m_docStatus = PDF_DATAAVAIL_PAGE;
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckHeader(DownloadHints* pHints) {
-  ASSERT(m_dwFileLen >= 0);
-  const uint32_t kReqSize = std::min(static_cast<uint32_t>(m_dwFileLen), 1024U);
-
-  if (m_pFileAvail->IsDataAvail(0, kReqSize)) {
-    uint8_t buffer[1024];
-    m_pFileRead->ReadBlock(buffer, 0, kReqSize);
-
-    if (IsLinearizedFile(buffer, kReqSize)) {
-      m_docStatus = PDF_DATAAVAIL_FIRSTPAGE;
-    } else {
-      if (m_docStatus == PDF_DATAAVAIL_ERROR)
-        return FALSE;
-      m_docStatus = PDF_DATAAVAIL_END;
-    }
-    return TRUE;
-  }
-
-  pHints->AddSegment(0, kReqSize);
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckFirstPage(DownloadHints* pHints) {
-  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-  CPDF_Object* pEndOffSet = pDict ? pDict->GetObjectFor("E") : nullptr;
-  if (!pEndOffSet) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  CPDF_Object* pXRefOffset = pDict ? pDict->GetObjectFor("T") : nullptr;
-  if (!pXRefOffset) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  CPDF_Object* pFileLen = pDict ? pDict->GetObjectFor("L") : nullptr;
-  if (!pFileLen) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  FX_BOOL bNeedDownLoad = FALSE;
-  if (pEndOffSet->IsNumber()) {
-    uint32_t dwEnd = pEndOffSet->GetInteger();
-    dwEnd += 512;
-    if ((FX_FILESIZE)dwEnd > m_dwFileLen)
-      dwEnd = (uint32_t)m_dwFileLen;
-
-    int32_t iStartPos = (int32_t)(m_dwFileLen > 1024 ? 1024 : m_dwFileLen);
-    int32_t iSize = dwEnd > 1024 ? dwEnd - 1024 : 0;
-    if (!m_pFileAvail->IsDataAvail(iStartPos, iSize)) {
-      pHints->AddSegment(iStartPos, iSize);
-      bNeedDownLoad = TRUE;
-    }
-  }
-
-  m_dwLastXRefOffset = 0;
-  FX_FILESIZE dwFileLen = 0;
-  if (pXRefOffset->IsNumber())
-    m_dwLastXRefOffset = pXRefOffset->GetInteger();
-
-  if (pFileLen->IsNumber())
-    dwFileLen = pFileLen->GetInteger();
-
-  if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
-                                 (uint32_t)(dwFileLen - m_dwLastXRefOffset))) {
-    if (m_docStatus == PDF_DATAAVAIL_FIRSTPAGE) {
-      uint32_t dwSize = (uint32_t)(dwFileLen - m_dwLastXRefOffset);
-      FX_FILESIZE offset = m_dwLastXRefOffset;
-      if (dwSize < 512 && dwFileLen > 512) {
-        dwSize = 512;
-        offset = dwFileLen - 512;
-      }
-      pHints->AddSegment(offset, dwSize);
-    }
-  } else {
-    m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
-  }
-
-  if (bNeedDownLoad || m_docStatus != PDF_DATAAVAIL_FIRSTPAGE_PREPARE) {
-    m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
-    return FALSE;
-  }
-
-  m_docStatus =
-      m_bSupportHintTable ? PDF_DATAAVAIL_HINTTABLE : PDF_DATAAVAIL_DONE;
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::IsDataAvail(FX_FILESIZE offset,
-                                    uint32_t size,
-                                    DownloadHints* pHints) {
-  if (offset < 0 || offset > m_dwFileLen)
-    return TRUE;
-
-  FX_SAFE_FILESIZE safeSize = offset;
-  safeSize += size;
-  safeSize += 512;
-  if (!safeSize.IsValid() || safeSize.ValueOrDie() > m_dwFileLen)
-    size = m_dwFileLen - offset;
-  else
-    size += 512;
-
-  if (!m_pFileAvail->IsDataAvail(offset, size)) {
-    pHints->AddSegment(offset, size);
-    return FALSE;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckHintTables(DownloadHints* pHints) {
-  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-  if (!pDict) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  // The actual value is not required here, but validate its existence and type.
-  CPDF_Number* pFirstPage = ToNumber(pDict->GetDirectObjectFor("O"));
-  if (!pFirstPage || !pFirstPage->IsInteger()) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  CPDF_Number* pPageCount = ToNumber(pDict->GetDirectObjectFor("N"));
-  if (!pPageCount || !pPageCount->IsInteger()) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  int nPageCount = pPageCount->GetInteger();
-  if (nPageCount <= 1) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-
-  CPDF_Array* pHintStreamRange = pDict->GetArrayFor("H");
-  size_t nHintStreamSize = pHintStreamRange ? pHintStreamRange->GetCount() : 0;
-  if (nHintStreamSize != 2 && nHintStreamSize != 4) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  for (const CPDF_Object* pArrayObject : *pHintStreamRange) {
-    const CPDF_Number* pNumber = ToNumber(pArrayObject->GetDirect());
-    if (!pNumber || !pNumber->IsInteger()) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-  }
-
-  FX_FILESIZE szHintStart = pHintStreamRange->GetIntegerAt(0);
-  FX_FILESIZE szHintLength = pHintStreamRange->GetIntegerAt(1);
-  if (szHintStart < 0 || szHintLength <= 0) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (!IsDataAvail(szHintStart, szHintLength, pHints))
-    return FALSE;
-
-  m_syntaxParser.InitParser(m_pFileRead, m_dwHeaderOffset);
-
-  std::unique_ptr<CPDF_HintTables> pHintTables(
-      new CPDF_HintTables(this, pDict));
-  std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pHintStream(
-      ParseIndirectObjectAt(szHintStart, 0));
-  CPDF_Stream* pStream = ToStream(pHintStream.get());
-  if (pStream && pHintTables->LoadHintStream(pStream))
-    m_pHintTables = std::move(pHintTables);
-
-  m_docStatus = PDF_DATAAVAIL_DONE;
-  return TRUE;
-}
-
-CPDF_Object* CPDF_DataAvail::ParseIndirectObjectAt(
-    FX_FILESIZE pos,
-    uint32_t objnum,
-    CPDF_IndirectObjectHolder* pObjList) {
-  FX_FILESIZE SavedPos = m_syntaxParser.SavePos();
-  m_syntaxParser.RestorePos(pos);
-
-  bool bIsNumber;
-  CFX_ByteString word = m_syntaxParser.GetNextWord(&bIsNumber);
-  if (!bIsNumber)
-    return nullptr;
-
-  uint32_t parser_objnum = FXSYS_atoui(word.c_str());
-  if (objnum && parser_objnum != objnum)
-    return nullptr;
-
-  word = m_syntaxParser.GetNextWord(&bIsNumber);
-  if (!bIsNumber)
-    return nullptr;
-
-  uint32_t gennum = FXSYS_atoui(word.c_str());
-  if (m_syntaxParser.GetKeyword() != "obj") {
-    m_syntaxParser.RestorePos(SavedPos);
-    return nullptr;
-  }
-
-  CPDF_Object* pObj =
-      m_syntaxParser.GetObject(pObjList, parser_objnum, gennum, true);
-  m_syntaxParser.RestorePos(SavedPos);
-  return pObj;
-}
-
-CPDF_DataAvail::DocLinearizationStatus CPDF_DataAvail::IsLinearizedPDF() {
-  const uint32_t kReqSize = 1024;
-  if (!m_pFileAvail->IsDataAvail(0, kReqSize))
-    return LinearizationUnknown;
-
-  if (!m_pFileRead)
-    return NotLinearized;
-
-  FX_FILESIZE dwSize = m_pFileRead->GetSize();
-  if (dwSize < (FX_FILESIZE)kReqSize)
-    return LinearizationUnknown;
-
-  uint8_t buffer[1024];
-  m_pFileRead->ReadBlock(buffer, 0, kReqSize);
-  if (IsLinearizedFile(buffer, kReqSize))
-    return Linearized;
-
-  return NotLinearized;
-}
-
-FX_BOOL CPDF_DataAvail::IsLinearized() {
-  return m_bLinearized;
-}
-
-FX_BOOL CPDF_DataAvail::IsLinearizedFile(uint8_t* pData, uint32_t dwLen) {
-  if (m_pLinearized)
-    return m_bLinearized;
-
-  ScopedFileStream file(FX_CreateMemoryStream(pData, (size_t)dwLen, FALSE));
-
-  int32_t offset = GetHeaderOffset(file.get());
-  if (offset == -1) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  m_dwHeaderOffset = offset;
-  m_syntaxParser.InitParser(file.get(), offset);
-  m_syntaxParser.RestorePos(m_syntaxParser.m_HeaderOffset + 9);
-
-  bool bNumber;
-  CFX_ByteString wordObjNum = m_syntaxParser.GetNextWord(&bNumber);
-  if (!bNumber)
-    return FALSE;
-
-  uint32_t objnum = FXSYS_atoui(wordObjNum.c_str());
-  m_pLinearized =
-      ParseIndirectObjectAt(m_syntaxParser.m_HeaderOffset + 9, objnum);
-  if (!m_pLinearized)
-    return FALSE;
-
-  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-  if (!pDict || !pDict->GetObjectFor("Linearized"))
-    return FALSE;
-
-  CPDF_Object* pLen = pDict->GetObjectFor("L");
-  if (!pLen)
-    return FALSE;
-
-  if ((FX_FILESIZE)pLen->GetInteger() != m_pFileRead->GetSize())
-    return FALSE;
-
-  m_bLinearized = TRUE;
-
-  if (CPDF_Number* pNo = ToNumber(pDict->GetObjectFor("P")))
-    m_dwFirstPageNo = pNo->GetInteger();
-
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckEnd(DownloadHints* pHints) {
-  uint32_t req_pos = (uint32_t)(m_dwFileLen > 1024 ? m_dwFileLen - 1024 : 0);
-  uint32_t dwSize = (uint32_t)(m_dwFileLen - req_pos);
-
-  if (m_pFileAvail->IsDataAvail(req_pos, dwSize)) {
-    uint8_t buffer[1024];
-    m_pFileRead->ReadBlock(buffer, req_pos, dwSize);
-
-    ScopedFileStream file(FX_CreateMemoryStream(buffer, (size_t)dwSize, FALSE));
-    m_syntaxParser.InitParser(file.get(), 0);
-    m_syntaxParser.RestorePos(dwSize - 1);
-
-    if (m_syntaxParser.SearchWord("startxref", TRUE, FALSE, dwSize)) {
-      m_syntaxParser.GetNextWord(nullptr);
-
-      bool bNumber;
-      CFX_ByteString xrefpos_str = m_syntaxParser.GetNextWord(&bNumber);
-      if (!bNumber) {
-        m_docStatus = PDF_DATAAVAIL_ERROR;
-        return FALSE;
-      }
-
-      m_dwXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str.c_str());
-      if (!m_dwXRefOffset || m_dwXRefOffset > m_dwFileLen) {
-        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-        return TRUE;
-      }
-
-      m_dwLastXRefOffset = m_dwXRefOffset;
-      SetStartOffset(m_dwXRefOffset);
-      m_docStatus = PDF_DATAAVAIL_CROSSREF;
-      return TRUE;
-    }
-
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-
-  pHints->AddSegment(req_pos, dwSize);
-  return FALSE;
-}
-
-int32_t CPDF_DataAvail::CheckCrossRefStream(DownloadHints* pHints,
-                                            FX_FILESIZE& xref_offset) {
-  xref_offset = 0;
-  uint32_t req_size =
-      (uint32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-
-  if (m_pFileAvail->IsDataAvail(m_Pos, req_size)) {
-    int32_t iSize = (int32_t)(m_Pos + req_size - m_dwCurrentXRefSteam);
-    CFX_BinaryBuf buf(iSize);
-    uint8_t* pBuf = buf.GetBuffer();
-
-    m_pFileRead->ReadBlock(pBuf, m_dwCurrentXRefSteam, iSize);
-
-    ScopedFileStream file(FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
-    m_parser.m_pSyntax->InitParser(file.get(), 0);
-
-    bool bNumber;
-    CFX_ByteString objnum = m_parser.m_pSyntax->GetNextWord(&bNumber);
-    if (!bNumber)
-      return -1;
-
-    uint32_t objNum = FXSYS_atoui(objnum.c_str());
-    CPDF_Object* pObj = m_parser.ParseIndirectObjectAt(nullptr, 0, objNum);
-    if (!pObj) {
-      m_Pos += m_parser.m_pSyntax->SavePos();
-      return 0;
-    }
-
-    CPDF_Dictionary* pDict = pObj->GetDict();
-    CPDF_Name* pName = ToName(pDict ? pDict->GetObjectFor("Type") : nullptr);
-    if (pName) {
-      if (pName->GetString() == "XRef") {
-        m_Pos += m_parser.m_pSyntax->SavePos();
-        xref_offset = pObj->GetDict()->GetIntegerFor("Prev");
-        pObj->Release();
-        return 1;
-      }
-    }
-    pObj->Release();
-    return -1;
-  }
-  pHints->AddSegment(m_Pos, req_size);
-  return 0;
-}
-
-void CPDF_DataAvail::SetStartOffset(FX_FILESIZE dwOffset) {
-  m_Pos = dwOffset;
-}
-
-FX_BOOL CPDF_DataAvail::GetNextToken(CFX_ByteString& token) {
-  uint8_t ch;
-  if (!GetNextChar(ch))
-    return FALSE;
-
-  while (1) {
-    while (PDFCharIsWhitespace(ch)) {
-      if (!GetNextChar(ch))
-        return FALSE;
-    }
-
-    if (ch != '%')
-      break;
-
-    while (1) {
-      if (!GetNextChar(ch))
-        return FALSE;
-      if (PDFCharIsLineEnding(ch))
-        break;
-    }
-  }
-
-  uint8_t buffer[256];
-  uint32_t index = 0;
-  if (PDFCharIsDelimiter(ch)) {
-    buffer[index++] = ch;
-    if (ch == '/') {
-      while (1) {
-        if (!GetNextChar(ch))
-          return FALSE;
-
-        if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) {
-          m_Pos--;
-          CFX_ByteString ret(buffer, index);
-          token = ret;
-          return TRUE;
-        }
-
-        if (index < sizeof(buffer))
-          buffer[index++] = ch;
-      }
-    } else if (ch == '<') {
-      if (!GetNextChar(ch))
-        return FALSE;
-
-      if (ch == '<')
-        buffer[index++] = ch;
-      else
-        m_Pos--;
-    } else if (ch == '>') {
-      if (!GetNextChar(ch))
-        return FALSE;
-
-      if (ch == '>')
-        buffer[index++] = ch;
-      else
-        m_Pos--;
-    }
-
-    CFX_ByteString ret(buffer, index);
-    token = ret;
-    return TRUE;
-  }
-
-  while (1) {
-    if (index < sizeof(buffer))
-      buffer[index++] = ch;
-
-    if (!GetNextChar(ch))
-      return FALSE;
-
-    if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) {
-      m_Pos--;
-      break;
-    }
-  }
-
-  token = CFX_ByteString(buffer, index);
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::GetNextChar(uint8_t& ch) {
-  FX_FILESIZE pos = m_Pos;
-  if (pos >= m_dwFileLen)
-    return FALSE;
-
-  if (m_bufferOffset >= pos ||
-      (FX_FILESIZE)(m_bufferOffset + m_bufferSize) <= pos) {
-    FX_FILESIZE read_pos = pos;
-    uint32_t read_size = 512;
-    if ((FX_FILESIZE)read_size > m_dwFileLen)
-      read_size = (uint32_t)m_dwFileLen;
-
-    if ((FX_FILESIZE)(read_pos + read_size) > m_dwFileLen)
-      read_pos = m_dwFileLen - read_size;
-
-    if (!m_pFileRead->ReadBlock(m_bufferData, read_pos, read_size))
-      return FALSE;
-
-    m_bufferOffset = read_pos;
-    m_bufferSize = read_size;
-  }
-  ch = m_bufferData[pos - m_bufferOffset];
-  m_Pos++;
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckCrossRefItem(DownloadHints* pHints) {
-  int32_t iSize = 0;
-  CFX_ByteString token;
-  while (1) {
-    if (!GetNextToken(token)) {
-      iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-      pHints->AddSegment(m_Pos, iSize);
-      return FALSE;
-    }
-
-    if (token == "trailer") {
-      m_dwTrailerOffset = m_Pos;
-      m_docStatus = PDF_DATAAVAIL_TRAILER;
-      return TRUE;
-    }
-  }
-}
-
-FX_BOOL CPDF_DataAvail::CheckAllCrossRefStream(DownloadHints* pHints) {
-  FX_FILESIZE xref_offset = 0;
-
-  int32_t nRet = CheckCrossRefStream(pHints, xref_offset);
-  if (nRet == 1) {
-    if (!xref_offset) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLCROSSREF;
-    } else {
-      m_dwCurrentXRefSteam = xref_offset;
-      m_Pos = xref_offset;
-    }
-    return TRUE;
-  }
-
-  if (nRet == -1)
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckCrossRef(DownloadHints* pHints) {
-  int32_t iSize = 0;
-  CFX_ByteString token;
-  if (!GetNextToken(token)) {
-    iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-    pHints->AddSegment(m_Pos, iSize);
-    return FALSE;
-  }
-
-  if (token == "xref") {
-    while (1) {
-      if (!GetNextToken(token)) {
-        iSize =
-            (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-        pHints->AddSegment(m_Pos, iSize);
-        m_docStatus = PDF_DATAAVAIL_CROSSREF_ITEM;
-        return FALSE;
-      }
-
-      if (token == "trailer") {
-        m_dwTrailerOffset = m_Pos;
-        m_docStatus = PDF_DATAAVAIL_TRAILER;
-        return TRUE;
-      }
-    }
-  } else {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckTrailerAppend(DownloadHints* pHints) {
-  if (m_Pos < m_dwFileLen) {
-    FX_FILESIZE dwAppendPos = m_Pos + m_syntaxParser.SavePos();
-    int32_t iSize = (int32_t)(
-        dwAppendPos + 512 > m_dwFileLen ? m_dwFileLen - dwAppendPos : 512);
-
-    if (!m_pFileAvail->IsDataAvail(dwAppendPos, iSize)) {
-      pHints->AddSegment(dwAppendPos, iSize);
-      return FALSE;
-    }
-  }
-
-  if (m_dwPrevXRefOffset) {
-    SetStartOffset(m_dwPrevXRefOffset);
-    m_docStatus = PDF_DATAAVAIL_CROSSREF;
-  } else {
-    m_docStatus = PDF_DATAAVAIL_LOADALLCROSSREF;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckTrailer(DownloadHints* pHints) {
-  int32_t iTrailerSize =
-      (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-  if (m_pFileAvail->IsDataAvail(m_Pos, iTrailerSize)) {
-    int32_t iSize = (int32_t)(m_Pos + iTrailerSize - m_dwTrailerOffset);
-    CFX_BinaryBuf buf(iSize);
-    uint8_t* pBuf = buf.GetBuffer();
-    if (!pBuf) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-
-    if (!m_pFileRead->ReadBlock(pBuf, m_dwTrailerOffset, iSize))
-      return FALSE;
-
-    ScopedFileStream file(FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
-    m_syntaxParser.InitParser(file.get(), 0);
-
-    std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pTrailer(
-        m_syntaxParser.GetObject(nullptr, 0, 0, true));
-    if (!pTrailer) {
-      m_Pos += m_syntaxParser.SavePos();
-      pHints->AddSegment(m_Pos, iTrailerSize);
-      return FALSE;
-    }
-
-    if (!pTrailer->IsDictionary())
-      return FALSE;
-
-    CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
-    CPDF_Object* pEncrypt = pTrailerDict->GetObjectFor("Encrypt");
-    if (ToReference(pEncrypt)) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-
-    uint32_t xrefpos = GetDirectInteger(pTrailerDict, "Prev");
-    if (xrefpos) {
-      m_dwPrevXRefOffset = GetDirectInteger(pTrailerDict, "XRefStm");
-      if (m_dwPrevXRefOffset) {
-        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      } else {
-        m_dwPrevXRefOffset = xrefpos;
-        if (m_dwPrevXRefOffset >= m_dwFileLen) {
-          m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-        } else {
-          SetStartOffset(m_dwPrevXRefOffset);
-          m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
-        }
-      }
-      return TRUE;
-    }
-    m_dwPrevXRefOffset = 0;
-    m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
-    return TRUE;
-  }
-  pHints->AddSegment(m_Pos, iTrailerSize);
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPage(uint32_t dwPage, DownloadHints* pHints) {
-  while (TRUE) {
-    switch (m_docStatus) {
-      case PDF_DATAAVAIL_PAGETREE:
-        if (!LoadDocPages(pHints))
-          return FALSE;
-        break;
-      case PDF_DATAAVAIL_PAGE:
-        if (!LoadDocPage(dwPage, pHints))
-          return FALSE;
-        break;
-      case PDF_DATAAVAIL_ERROR:
-        return LoadAllFile(pHints);
-      default:
-        m_bPagesTreeLoad = TRUE;
-        m_bPagesLoad = TRUE;
-        m_bCurPageDictLoadOK = TRUE;
-        m_docStatus = PDF_DATAAVAIL_PAGE;
-        return TRUE;
-    }
-  }
-}
-
-FX_BOOL CPDF_DataAvail::CheckArrayPageNode(uint32_t dwPageNo,
-                                           PageNode* pPageNode,
-                                           DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(dwPageNo, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (!pPages) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    return FALSE;
-  }
-
-  CPDF_Array* pArray = pPages->AsArray();
-  if (!pArray) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  pPageNode->m_type = PDF_PAGENODE_PAGES;
-  for (size_t i = 0; i < pArray->GetCount(); ++i) {
-    CPDF_Reference* pKid = ToReference(pArray->GetObjectAt(i));
-    if (!pKid)
-      continue;
-
-    PageNode* pNode = new PageNode();
-    pPageNode->m_childNode.Add(pNode);
-    pNode->m_dwPageNo = pKid->GetRefObjNum();
-  }
-  pPages->Release();
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckUnkownPageNode(uint32_t dwPageNo,
-                                            PageNode* pPageNode,
-                                            DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPage = GetObject(dwPageNo, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (!pPage) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR)
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (pPage->IsArray()) {
-    pPageNode->m_dwPageNo = dwPageNo;
-    pPageNode->m_type = PDF_PAGENODE_ARRAY;
-    pPage->Release();
-    return TRUE;
-  }
-
-  if (!pPage->IsDictionary()) {
-    pPage->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  pPageNode->m_dwPageNo = dwPageNo;
-  CPDF_Dictionary* pDict = pPage->GetDict();
-  CFX_ByteString type = pDict->GetStringFor("Type");
-  if (type == "Pages") {
-    pPageNode->m_type = PDF_PAGENODE_PAGES;
-    CPDF_Object* pKids = pDict->GetObjectFor("Kids");
-    if (!pKids) {
-      m_docStatus = PDF_DATAAVAIL_PAGE;
-      return TRUE;
-    }
-
-    switch (pKids->GetType()) {
-      case CPDF_Object::REFERENCE: {
-        CPDF_Reference* pKid = pKids->AsReference();
-        PageNode* pNode = new PageNode();
-        pPageNode->m_childNode.Add(pNode);
-        pNode->m_dwPageNo = pKid->GetRefObjNum();
-      } break;
-      case CPDF_Object::ARRAY: {
-        CPDF_Array* pKidsArray = pKids->AsArray();
-        for (size_t i = 0; i < pKidsArray->GetCount(); ++i) {
-          CPDF_Reference* pKid = ToReference(pKidsArray->GetObjectAt(i));
-          if (!pKid)
-            continue;
-
-          PageNode* pNode = new PageNode();
-          pPageNode->m_childNode.Add(pNode);
-          pNode->m_dwPageNo = pKid->GetRefObjNum();
-        }
-      } break;
-      default:
-        break;
-    }
-  } else if (type == "Page") {
-    pPageNode->m_type = PDF_PAGENODE_PAGE;
-  } else {
-    pPage->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  pPage->Release();
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPageNode(CPDF_DataAvail::PageNode& pageNodes,
-                                      int32_t iPage,
-                                      int32_t& iCount,
-                                      DownloadHints* pHints,
-                                      int level) {
-  if (level >= kMaxPageRecursionDepth)
-    return FALSE;
-
-  int32_t iSize = pageNodes.m_childNode.GetSize();
-  if (iSize <= 0 || iPage >= iSize) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  for (int32_t i = 0; i < iSize; ++i) {
-    PageNode* pNode = pageNodes.m_childNode.GetAt(i);
-    if (!pNode)
-      continue;
-
-    switch (pNode->m_type) {
-      case PDF_PAGENODE_UNKNOWN:
-        if (!CheckUnkownPageNode(pNode->m_dwPageNo, pNode, pHints)) {
-          return FALSE;
-        }
-        --i;
-        break;
-      case PDF_PAGENODE_PAGE:
-        iCount++;
-        if (iPage == iCount && m_pDocument)
-          m_pDocument->SetPageObjNum(iPage, pNode->m_dwPageNo);
-        break;
-      case PDF_PAGENODE_PAGES:
-        if (!CheckPageNode(*pNode, iPage, iCount, pHints, level + 1))
-          return FALSE;
-        break;
-      case PDF_PAGENODE_ARRAY:
-        if (!CheckArrayPageNode(pNode->m_dwPageNo, pNode, pHints))
-          return FALSE;
-        --i;
-        break;
-    }
-
-    if (iPage == iCount) {
-      m_docStatus = PDF_DATAAVAIL_DONE;
-      return TRUE;
-    }
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::LoadDocPage(uint32_t dwPage, DownloadHints* pHints) {
-  FX_SAFE_INT32 safePage = pdfium::base::checked_cast<int32_t>(dwPage);
-  int32_t iPage = safePage.ValueOrDie();
-  if (m_pDocument->GetPageCount() <= iPage ||
-      m_pDocument->IsPageLoaded(iPage)) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-
-  if (m_pageNodes.m_type == PDF_PAGENODE_PAGE) {
-    if (iPage == 0) {
-      m_docStatus = PDF_DATAAVAIL_DONE;
-      return TRUE;
-    }
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return TRUE;
-  }
-  int32_t iCount = -1;
-  return CheckPageNode(m_pageNodes, iPage, iCount, pHints, 0);
-}
-
-FX_BOOL CPDF_DataAvail::CheckPageCount(DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (!pPages)
-    return FALSE;
-
-  CPDF_Dictionary* pPagesDict = pPages->GetDict();
-  if (!pPagesDict) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-
-  if (!pPagesDict->KeyExist("Kids")) {
-    pPages->Release();
-    return TRUE;
-  }
-
-  int count = pPagesDict->GetIntegerFor("Count");
-  if (count > 0) {
-    pPages->Release();
-    return TRUE;
-  }
-
-  pPages->Release();
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::LoadDocPages(DownloadHints* pHints) {
-  if (!CheckUnkownPageNode(m_PagesObjNum, &m_pageNodes, pHints))
-    return FALSE;
-
-  if (CheckPageCount(pHints)) {
-    m_docStatus = PDF_DATAAVAIL_PAGE;
-    return TRUE;
-  }
-
-  m_bTotalLoadPageTree = TRUE;
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::LoadPages(DownloadHints* pHints) {
-  while (!m_bPagesTreeLoad) {
-    if (!CheckPageStatus(pHints))
-      return FALSE;
-  }
-
-  if (m_bPagesLoad)
-    return TRUE;
-
-  m_pDocument->LoadPages();
-  return FALSE;
-}
-
-CPDF_DataAvail::DocAvailStatus CPDF_DataAvail::CheckLinearizedData(
-    DownloadHints* pHints) {
-  if (m_bLinearedDataOK)
-    return DataAvailable;
-
-  if (!m_bMainXRefLoadTried) {
-    FX_SAFE_UINT32 data_size = m_dwFileLen;
-    data_size -= m_dwLastXRefOffset;
-    if (!data_size.IsValid())
-      return DataError;
-
-    if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
-                                   data_size.ValueOrDie())) {
-      pHints->AddSegment(m_dwLastXRefOffset, data_size.ValueOrDie());
-      return DataNotAvailable;
-    }
-
-    CPDF_Parser::Error eRet =
-        m_pDocument->GetParser()->LoadLinearizedMainXRefTable();
-    m_bMainXRefLoadTried = TRUE;
-    if (eRet != CPDF_Parser::SUCCESS)
-      return DataError;
-
-    if (!PreparePageItem())
-      return DataNotAvailable;
-
-    m_bMainXRefLoadedOK = TRUE;
-    m_bLinearedDataOK = TRUE;
-  }
-
-  return m_bLinearedDataOK ? DataAvailable : DataNotAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPageAnnots(uint32_t dwPage,
-                                        DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    m_ObjectSet.clear();
-
-    FX_SAFE_INT32 safePage = pdfium::base::checked_cast<int32_t>(dwPage);
-    CPDF_Dictionary* pPageDict = m_pDocument->GetPage(safePage.ValueOrDie());
-    if (!pPageDict)
-      return TRUE;
-
-    CPDF_Object* pAnnots = pPageDict->GetObjectFor("Annots");
-    if (!pAnnots)
-      return TRUE;
-
-    CFX_ArrayTemplate<CPDF_Object*> obj_array;
-    obj_array.Add(pAnnots);
-
-    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
-    if (bRet)
-      m_objs_array.RemoveAll();
-
-    return bRet;
-  }
-
-  CFX_ArrayTemplate<CPDF_Object*> new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet)
-    m_objs_array.Append(new_objs_array);
-
-  return bRet;
-}
-
-CPDF_DataAvail::DocAvailStatus CPDF_DataAvail::CheckLinearizedFirstPage(
-    uint32_t dwPage,
-    DownloadHints* pHints) {
-  if (!m_bAnnotsLoad) {
-    if (!CheckPageAnnots(dwPage, pHints))
-      return DataNotAvailable;
-    m_bAnnotsLoad = TRUE;
-  }
-
-  DocAvailStatus nRet = CheckLinearizedData(pHints);
-  if (nRet == DataAvailable)
-    m_bPageLoadedOK = FALSE;
-  return nRet;
-}
-
-FX_BOOL CPDF_DataAvail::HaveResourceAncestor(CPDF_Dictionary* pDict) {
-  CFX_AutoRestorer<int> restorer(&s_CurrentDataAvailRecursionDepth);
-  if (++s_CurrentDataAvailRecursionDepth > kMaxDataAvailRecursionDepth)
-    return FALSE;
-
-  CPDF_Object* pParent = pDict->GetObjectFor("Parent");
-  if (!pParent)
-    return FALSE;
-
-  CPDF_Dictionary* pParentDict = pParent->GetDict();
-  if (!pParentDict)
-    return FALSE;
-
-  CPDF_Object* pRet = pParentDict->GetObjectFor("Resources");
-  if (pRet) {
-    m_pPageResource = pRet;
-    return TRUE;
-  }
-
-  return HaveResourceAncestor(pParentDict);
-}
-
-CPDF_DataAvail::DocAvailStatus CPDF_DataAvail::IsPageAvail(
-    uint32_t dwPage,
-    DownloadHints* pHints) {
-  if (!m_pDocument)
-    return DataError;
-
-  if (IsFirstCheck(dwPage)) {
-    m_bCurPageDictLoadOK = FALSE;
-    m_bPageLoadedOK = FALSE;
-    m_bAnnotsLoad = FALSE;
-    m_bNeedDownLoadResource = FALSE;
-    m_objs_array.RemoveAll();
-    m_ObjectSet.clear();
-  }
-
-  if (pdfium::ContainsKey(m_pagesLoadState, dwPage))
-    return DataAvailable;
-
-  if (m_bLinearized) {
-    if (dwPage == m_dwFirstPageNo) {
-      DocAvailStatus nRet = CheckLinearizedFirstPage(dwPage, pHints);
-      if (nRet == DataAvailable)
-        m_pagesLoadState.insert(dwPage);
-      return nRet;
-    }
-
-    DocAvailStatus nResult = CheckLinearizedData(pHints);
-    if (nResult != DataAvailable)
-      return nResult;
-
-    if (m_pHintTables) {
-      nResult = m_pHintTables->CheckPage(dwPage, pHints);
-      if (nResult != DataAvailable)
-        return nResult;
-      m_pagesLoadState.insert(dwPage);
-      return DataAvailable;
-    }
-
-    if (m_bMainXRefLoadedOK) {
-      if (m_bTotalLoadPageTree) {
-        if (!LoadPages(pHints))
-          return DataNotAvailable;
-      } else {
-        if (!m_bCurPageDictLoadOK && !CheckPage(dwPage, pHints))
-          return DataNotAvailable;
-      }
-    } else {
-      if (!LoadAllFile(pHints))
-        return DataNotAvailable;
-      m_pDocument->GetParser()->RebuildCrossRef();
-      ResetFirstCheck(dwPage);
-      return DataAvailable;
-    }
-  } else {
-    if (!m_bTotalLoadPageTree && !m_bCurPageDictLoadOK &&
-        !CheckPage(dwPage, pHints)) {
-      return DataNotAvailable;
-    }
-  }
-
-  if (m_bHaveAcroForm && !m_bAcroFormLoad) {
-    if (!CheckAcroFormSubObject(pHints))
-      return DataNotAvailable;
-    m_bAcroFormLoad = TRUE;
-  }
-
-  if (!m_bPageLoadedOK) {
-    if (!m_objs_array.GetSize()) {
-      m_objs_array.RemoveAll();
-      m_ObjectSet.clear();
-
-      FX_SAFE_INT32 safePage = pdfium::base::checked_cast<int32_t>(dwPage);
-      m_pPageDict = m_pDocument->GetPage(safePage.ValueOrDie());
-      if (!m_pPageDict) {
-        ResetFirstCheck(dwPage);
-        return DataAvailable;
-      }
-
-      CFX_ArrayTemplate<CPDF_Object*> obj_array;
-      obj_array.Add(m_pPageDict);
-      FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
-      if (!bRet)
-        return DataNotAvailable;
-
-      m_objs_array.RemoveAll();
-    } else {
-      CFX_ArrayTemplate<CPDF_Object*> new_objs_array;
-      FX_BOOL bRet =
-          IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-
-      m_objs_array.RemoveAll();
-      if (!bRet) {
-        m_objs_array.Append(new_objs_array);
-        return DataNotAvailable;
-      }
-    }
-    m_bPageLoadedOK = TRUE;
-  }
-
-  if (!m_bAnnotsLoad) {
-    if (!CheckPageAnnots(dwPage, pHints))
-      return DataNotAvailable;
-    m_bAnnotsLoad = TRUE;
-  }
-
-  if (m_pPageDict && !m_bNeedDownLoadResource) {
-    m_pPageResource = m_pPageDict->GetObjectFor("Resources");
-    m_bNeedDownLoadResource =
-        m_pPageResource || HaveResourceAncestor(m_pPageDict);
-  }
-
-  if (m_bNeedDownLoadResource) {
-    if (!CheckResources(pHints))
-      return DataNotAvailable;
-    m_bNeedDownLoadResource = FALSE;
-  }
-
-  m_bPageLoadedOK = FALSE;
-  m_bAnnotsLoad = FALSE;
-  m_bCurPageDictLoadOK = FALSE;
-
-  ResetFirstCheck(dwPage);
-  m_pagesLoadState.insert(dwPage);
-  return DataAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckResources(DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    CFX_ArrayTemplate<CPDF_Object*> obj_array;
-    obj_array.Add(m_pPageResource);
-
-    FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
-    if (bRet)
-      m_objs_array.RemoveAll();
-    return bRet;
-  }
-
-  CFX_ArrayTemplate<CPDF_Object*> new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet)
-    m_objs_array.Append(new_objs_array);
-  return bRet;
-}
-
-void CPDF_DataAvail::GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
-                                               uint32_t* pSize) {
-  if (pPos)
-    *pPos = m_dwLastXRefOffset;
-  if (pSize)
-    *pSize = (uint32_t)(m_dwFileLen - m_dwLastXRefOffset);
-}
-
-int CPDF_DataAvail::GetPageCount() const {
-  if (m_pLinearized) {
-    CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-    CPDF_Object* pObj = pDict ? pDict->GetDirectObjectFor("N") : nullptr;
-    return pObj ? pObj->GetInteger() : 0;
-  }
-  return m_pDocument ? m_pDocument->GetPageCount() : 0;
-}
-
-CPDF_Dictionary* CPDF_DataAvail::GetPage(int index) {
-  if (!m_pDocument || index < 0 || index >= GetPageCount())
-    return nullptr;
-
-  if (m_pLinearized) {
-    CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-    CPDF_Object* pObj = pDict ? pDict->GetDirectObjectFor("P") : nullptr;
-
-    int pageNum = pObj ? pObj->GetInteger() : 0;
-    if (m_pHintTables && index != pageNum) {
-      FX_FILESIZE szPageStartPos = 0;
-      FX_FILESIZE szPageLength = 0;
-      uint32_t dwObjNum = 0;
-      bool bPagePosGot = m_pHintTables->GetPagePos(index, &szPageStartPos,
-                                                   &szPageLength, &dwObjNum);
-      if (!bPagePosGot)
-        return nullptr;
-
-      m_syntaxParser.InitParser(m_pFileRead, (uint32_t)szPageStartPos);
-      CPDF_Object* pPageDict = ParseIndirectObjectAt(0, dwObjNum, m_pDocument);
-      if (!pPageDict)
-        return nullptr;
-
-      if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(dwObjNum,
-                                                                pPageDict)) {
-        return nullptr;
-      }
-      return pPageDict->GetDict();
-    }
-  }
-  return m_pDocument->GetPage(index);
-}
-
-CPDF_DataAvail::DocFormStatus CPDF_DataAvail::IsFormAvail(
-    DownloadHints* pHints) {
-  if (!m_pDocument)
-    return FormAvailable;
-
-  if (!m_bLinearizedFormParamLoad) {
-    CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
-    if (!pRoot)
-      return FormAvailable;
-
-    CPDF_Object* pAcroForm = pRoot->GetObjectFor("AcroForm");
-    if (!pAcroForm)
-      return FormNotExist;
-
-    DocAvailStatus nDocStatus = CheckLinearizedData(pHints);
-    if (nDocStatus == DataError)
-      return FormError;
-    if (nDocStatus == DataNotAvailable)
-      return FormNotAvailable;
-
-    if (!m_objs_array.GetSize())
-      m_objs_array.Add(pAcroForm->GetDict());
-    m_bLinearizedFormParamLoad = TRUE;
-  }
-
-  CFX_ArrayTemplate<CPDF_Object*> new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet) {
-    m_objs_array.Append(new_objs_array);
-    return FormNotAvailable;
-  }
-  return FormAvailable;
-}
-
-CPDF_DataAvail::PageNode::PageNode() : m_type(PDF_PAGENODE_UNKNOWN) {}
-
-CPDF_DataAvail::PageNode::~PageNode() {
-  for (int32_t i = 0; i < m_childNode.GetSize(); ++i)
-    delete m_childNode[i];
-  m_childNode.RemoveAll();
-}