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//========================================================================
//
// XRef.h
//
// Copyright 1996 Derek B. Noonburg
//
//========================================================================
#ifndef XREF_H
#define XREF_H
#ifdef __GNUC__
#pragma interface
#endif
#include "gtypes.h"
#include "Object.h"
class Dict;
class Stream;
//------------------------------------------------------------------------
// XRef
//------------------------------------------------------------------------
struct XRefEntry {
int offset;
int gen;
GBool used;
};
class XRef {
public:
// Constructor. Read xref table from stream.
XRef(BaseStream *strA, GString *ownerPassword, GString *userPassword);
// Destructor.
~XRef();
// Is xref table valid?
GBool isOk() { return ok; }
// Is the file encrypted?
#ifndef NO_DECRYPTION
GBool isEncrypted() { return encrypted; }
#else
GBool isEncrypted() { return gFalse; }
#endif
// Check various permissions.
GBool okToPrint(GBool ignoreOwnerPW = gFalse);
GBool okToChange(GBool ignoreOwnerPW = gFalse);
GBool okToCopy(GBool ignoreOwnerPW = gFalse);
GBool okToAddNotes(GBool ignoreOwnerPW = gFalse);
// 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);
Object *getDocInfoNF(Object *obj);
// Return the number of objects in the xref table.
int getNumObjects() { return size; }
// Return the offset of the last xref table.
int getLastXRefPos() { return lastXRefPos; }
// Return the catalog object reference.
int getRootNum() { return rootNum; }
int getRootGen() { return rootGen; }
// Get end position for a stream in a damaged file.
// Returns -1 if unknown or file is not damaged.
int getStreamEnd(int streamStart);
private:
BaseStream *str; // input stream
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 lastXRefPos; // offset of last xref table
int *streamEnds; // 'endstream' positions - only used in
// damaged files
int streamEndsLen; // number of valid entries in streamEnds
#ifndef NO_DECRYPTION
GBool encrypted; // true if file is encrypted
int encVersion; // encryption algorithm
int encRevision; // security handler revision
int keyLength; // length of key, in bytes
int permFlags; // permission bits
Guchar fileKey[16]; // file decryption key
GBool ownerPasswordOk; // true if owner password is correct
#endif
int readTrailer();
GBool readXRef(int *pos);
GBool constructXRef();
GBool checkEncrypted(GString *ownerPassword, GString *userPassword);
};
#endif
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