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//========================================================================
//
// XRef.h
//
// Copyright 1996 Derek B. Noonburg
//
//========================================================================
#ifndef XREF_H
#define XREF_H
#ifdef __GNUC__
#pragma interface
#endif
#include <stdio.h>
#include "gtypes.h"
#include "Object.h"
class Dict;
class FileStream;
//------------------------------------------------------------------------
// XRef
//------------------------------------------------------------------------
struct XRefEntry {
int offset;
int gen;
GBool used;
};
class XRef {
public:
// Constructor. Read xref table from stream.
XRef(Stream *str);
// Destructor.
~XRef();
// Is xref table valid?
GBool isOk() { return ok; }
// Is the file encrypted?
GBool isEncrypted() { return gFalse; }
// Are printing and copying allowed? If not, print an error message.
GBool okToPrint();
GBool okToCopy();
// Get catalog object.
Object *getCatalog(Object *obj) { return fetch(rootNum, rootGen, obj); }
// Fetch an indirect reference.
Object *fetch(int num, int gen, Object *obj);
// Return the document's Info dictionary (if any).
Object *getDocInfo(Object *obj);
private:
Stream *str; // input file
int start; // offset in file (to allow for garbage
// at beginning of file)
XRefEntry *entries; // xref entries
int size; // size of <entries> array
int rootNum, rootGen; // catalog dict
GBool ok; // true if xref table is valid
Object trailerDict; // trailer dictionary
int readTrailer(Stream *str);
GBool readXRef(Stream *str, int *pos);
GBool constructXRef(Stream *str);
GBool checkEncrypted();
};
//------------------------------------------------------------------------
// The global xref table
//------------------------------------------------------------------------
extern XRef *xref;
#endif
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