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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
#ifndef CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_
#define CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_
#include <map>
#include <memory>
#include <set>
#include <vector>
#include "core/fpdfapi/parser/cpdf_parser.h"
#include "core/fpdfapi/parser/cpdf_syntax_parser.h"
#include "core/fxcrt/unowned_ptr.h"
class CPDF_Dictionary;
class CPDF_HintTables;
class CPDF_IndirectObjectHolder;
class CPDF_LinearizedHeader;
class CPDF_PageObjectAvail;
class CPDF_Parser;
class CPDF_ReadValidator;
enum PDF_DATAAVAIL_STATUS {
PDF_DATAAVAIL_HEADER = 0,
PDF_DATAAVAIL_FIRSTPAGE,
PDF_DATAAVAIL_HINTTABLE,
PDF_DATAAVAIL_END,
PDF_DATAAVAIL_CROSSREF,
PDF_DATAAVAIL_CROSSREF_ITEM,
PDF_DATAAVAIL_TRAILER,
PDF_DATAAVAIL_LOADALLCROSSREF,
PDF_DATAAVAIL_ROOT,
PDF_DATAAVAIL_INFO,
PDF_DATAAVAIL_PAGETREE,
PDF_DATAAVAIL_PAGE,
PDF_DATAAVAIL_PAGE_LATERLOAD,
PDF_DATAAVAIL_RESOURCES,
PDF_DATAAVAIL_DONE,
PDF_DATAAVAIL_ERROR,
PDF_DATAAVAIL_LOADALLFILE,
};
enum PDF_PAGENODE_TYPE {
PDF_PAGENODE_UNKNOWN = 0,
PDF_PAGENODE_PAGE,
PDF_PAGENODE_PAGES,
PDF_PAGENODE_ARRAY,
};
class CPDF_DataAvail final {
public:
// Must match PDF_DATA_* definitions in public/fpdf_dataavail.h, but cannot
// #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
// to make sure the two sets of values match.
enum DocAvailStatus {
DataError = -1, // PDF_DATA_ERROR
DataNotAvailable = 0, // PDF_DATA_NOTAVAIL
DataAvailable = 1, // PDF_DATA_AVAIL
};
// Must match PDF_*LINEAR* definitions in public/fpdf_dataavail.h, but cannot
// #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
// to make sure the two sets of values match.
enum DocLinearizationStatus {
LinearizationUnknown = -1, // PDF_LINEARIZATION_UNKNOWN
NotLinearized = 0, // PDF_NOT_LINEARIZED
Linearized = 1, // PDF_LINEARIZED
};
// Must match PDF_FORM_* definitions in public/fpdf_dataavail.h, but cannot
// #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
// to make sure the two sets of values match.
enum DocFormStatus {
FormError = -1, // PDF_FORM_ERROR
FormNotAvailable = 0, // PDF_FORM_NOTAVAIL
FormAvailable = 1, // PDF_FORM_AVAIL
FormNotExist = 2, // PDF_FORM_NOTEXIST
};
class FileAvail {
public:
virtual ~FileAvail();
virtual bool IsDataAvail(FX_FILESIZE offset, size_t size) = 0;
};
class DownloadHints {
public:
virtual ~DownloadHints();
virtual void AddSegment(FX_FILESIZE offset, size_t size) = 0;
};
CPDF_DataAvail(FileAvail* pFileAvail,
const RetainPtr<IFX_SeekableReadStream>& pFileRead,
bool bSupportHintTable);
~CPDF_DataAvail();
DocAvailStatus IsDocAvail(DownloadHints* pHints);
void SetDocument(CPDF_Document* pDoc);
DocAvailStatus IsPageAvail(uint32_t dwPage, DownloadHints* pHints);
DocFormStatus IsFormAvail(DownloadHints* pHints);
DocLinearizationStatus IsLinearizedPDF();
RetainPtr<IFX_SeekableReadStream> GetFileRead() const;
int GetPageCount() const;
CPDF_Dictionary* GetPage(int index);
RetainPtr<CPDF_ReadValidator> GetValidator() const;
const CPDF_HintTables* GetHintTables() const { return m_pHintTables.get(); }
protected:
class PageNode {
public:
PageNode();
~PageNode();
PDF_PAGENODE_TYPE m_type;
uint32_t m_dwPageNo;
std::vector<std::unique_ptr<PageNode>> m_ChildNodes;
};
static const int kMaxPageRecursionDepth = 1024;
bool CheckDocStatus();
bool CheckHeader();
bool CheckFirstPage();
bool CheckHintTables();
bool CheckEnd();
bool CheckCrossRef();
bool CheckCrossRefItem();
bool CheckTrailer();
bool CheckRoot();
bool CheckInfo();
bool CheckPages();
bool CheckPage();
DocAvailStatus CheckResources(const CPDF_Dictionary* page);
DocFormStatus CheckAcroForm();
bool CheckPageStatus();
DocAvailStatus CheckHeaderAndLinearized();
void SetStartOffset(FX_FILESIZE dwOffset);
bool GetNextToken(ByteString* token);
bool GetNextChar(uint8_t& ch);
std::unique_ptr<CPDF_Object> ParseIndirectObjectAt(
FX_FILESIZE pos,
uint32_t objnum,
CPDF_IndirectObjectHolder* pObjList = nullptr);
std::unique_ptr<CPDF_Object> GetObject(uint32_t objnum,
bool* pExistInFile);
bool GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages);
bool PreparePageItem();
bool LoadPages();
bool LoadAllXref();
bool LoadAllFile();
DocAvailStatus CheckLinearizedData();
bool CheckPage(uint32_t dwPage);
bool LoadDocPages();
bool LoadDocPage(uint32_t dwPage);
bool CheckPageNode(const PageNode& pageNode,
int32_t iPage,
int32_t& iCount,
int level);
bool CheckUnknownPageNode(uint32_t dwPageNo, PageNode* pPageNode);
bool CheckArrayPageNode(uint32_t dwPageNo, PageNode* pPageNode);
bool CheckPageCount();
bool IsFirstCheck(uint32_t dwPage);
void ResetFirstCheck(uint32_t dwPage);
bool ValidatePage(uint32_t dwPage);
CPDF_SyntaxParser* GetSyntaxParser() const;
FileAvail* const m_pFileAvail;
RetainPtr<CPDF_ReadValidator> m_pFileRead;
CPDF_Parser m_parser;
std::unique_ptr<CPDF_Object> m_pRoot;
uint32_t m_dwRootObjNum;
uint32_t m_dwInfoObjNum;
std::unique_ptr<CPDF_LinearizedHeader> m_pLinearized;
UnownedPtr<CPDF_Object> m_pTrailer;
bool m_bDocAvail;
FX_FILESIZE m_dwLastXRefOffset;
FX_FILESIZE m_dwXRefOffset;
FX_FILESIZE m_dwTrailerOffset;
FX_FILESIZE m_dwCurrentOffset;
PDF_DATAAVAIL_STATUS m_docStatus;
FX_FILESIZE m_dwFileLen;
CPDF_Document* m_pDocument;
FX_FILESIZE m_Pos;
FX_FILESIZE m_bufferOffset;
uint32_t m_bufferSize;
ByteString m_WordBuf;
uint8_t m_bufferData[512];
std::vector<uint32_t> m_XRefStreamList;
std::vector<uint32_t> m_PageObjList;
uint32_t m_PagesObjNum;
bool m_bLinearedDataOK;
bool m_bMainXRefLoadTried;
bool m_bMainXRefLoadedOK;
bool m_bPagesTreeLoad;
bool m_bPagesLoad;
CPDF_Parser* m_pCurrentParser;
FX_FILESIZE m_dwCurrentXRefSteam;
std::unique_ptr<CPDF_PageObjectAvail> m_pFormAvail;
std::vector<std::unique_ptr<CPDF_Object>> m_PagesArray;
uint32_t m_dwEncryptObjNum;
FX_FILESIZE m_dwPrevXRefOffset;
bool m_bTotalLoadPageTree;
bool m_bCurPageDictLoadOK;
PageNode m_PageNode;
std::set<uint32_t> m_pageMapCheckState;
std::set<uint32_t> m_pagesLoadState;
std::set<uint32_t> m_SeenPrevPositions;
std::unique_ptr<CPDF_HintTables> m_pHintTables;
bool m_bSupportHintTable;
std::map<uint32_t, std::unique_ptr<CPDF_PageObjectAvail>> m_PagesObjAvail;
std::map<const CPDF_Object*, std::unique_ptr<CPDF_PageObjectAvail>>
m_PagesResourcesAvail;
bool m_bHeaderAvail;
};
#endif // CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_
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