/usr/include/poppler/Hints.h is in libpoppler-dev 0.18.4-1ubuntu3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Hints.h
//
// This file is licensed under the GPLv2 or later
//
// Copyright 2010 Hib Eris <hib@hiberis.nl>
// Copyright 2010 Albert Astals Cid <aacid@kde.org>
//
//========================================================================
#ifndef HINTS_H
#define HINTS_H
#include <string.h>
#include "goo/gtypes.h"
#include <vector>
#include "PDFDoc.h"
class Stream;
class BaseStream;
class Linearization;
class XRef;
//------------------------------------------------------------------------
// Hints
//------------------------------------------------------------------------
class Hints {
public:
Hints(BaseStream *str, Linearization *linearization, XRef *xref, SecurityHandler *secHdlr);
~Hints();
int getPageObjectNum(int page);
Guint getPageOffset(int page);
std::vector<ByteRange>* getPageRanges(int page);
private:
void readTables(BaseStream *str, Linearization *linearization, XRef *xref, SecurityHandler *secHdlr);
void readPageOffsetTable(Stream *str);
void readSharedObjectsTable(Stream *str);
Guint readBit(Stream *str);
Guint readBits(int n, Stream *str);
Guint hintsOffset;
Guint hintsLength;
Guint hintsOffset2;
Guint hintsLength2;
Guint mainXRefEntriesOffset;
int nPages;
int pageFirst;
int pageObjectFirst;
Guint pageOffsetFirst;
Guint pageEndFirst;
int objectNumberFirst;
Guint nObjectLeast;
Guint objectOffsetFirst;
Guint nBitsDiffObjects;
Guint pageLengthLeast;
Guint nBitsDiffPageLength;
Guint OffsetStreamLeast;
Guint nBitsOffsetStream;
Guint lengthStreamLeast;
Guint nBitsLengthStream;
Guint nBitsNumShared;
Guint nBitsShared;
Guint nBitsNumerator;
Guint denominator;
Guint *nObjects;
int *pageObjectNum;
Guint *xRefOffset;
Guint *pageLength;
Guint *pageOffset;
Guint *numSharedObject;
Guint **sharedObjectId;
Guint nSharedGroups;
Guint *groupLength;
Guint *groupOffset;
Guint *groupHasSignature;
Guint *groupNumObjects;
Guint *groupXRefOffset;
int inputBits;
char bitsBuffer;
};
#endif
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