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//========================================================================
//
// XRef.h
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
#ifndef XREF_H
#define XREF_H
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "gtypes.h"
#include "Object.h"
class Dict;
class Stream;
class Parser;
class ObjectStream;
//------------------------------------------------------------------------
// XRef
//------------------------------------------------------------------------
enum XRefEntryType {
xrefEntryFree,
xrefEntryUncompressed,
xrefEntryCompressed
};
struct XRefEntry {
Guint offset;
int gen;
XRefEntryType type;
};
class XRef {
public:
// Constructor. Read xref table from stream.
XRef(BaseStream *strA, GBool repair);
// Destructor.
~XRef();
// Is xref table valid?
GBool isOk() { return ok; }
// Get the error code (if isOk() returns false).
int getErrorCode() { return errCode; }
// Set the encryption parameters.
void setEncryption(int permFlagsA, GBool ownerPasswordOkA,
Guchar *fileKeyA, int keyLengthA, int encVersionA,
CryptAlgorithm encAlgorithmA);
// Is the file encrypted?
GBool isEncrypted() { return encrypted; }
// Check various permissions.
GBool okToPrint(GBool ignoreOwnerPW = gFalse);
GBool okToChange(GBool ignoreOwnerPW = gFalse);
GBool okToCopy(GBool ignoreOwnerPW = gFalse);
GBool okToAddNotes(GBool ignoreOwnerPW = gFalse);
int getPermFlags() { return permFlags; }
// Get catalog object.
Object *getCatalog(Object *obj) { return fetch(rootNum, rootGen, obj); }
// Fetch an indirect reference.
Object *fetch(int num, int gen, Object *obj, int recursion = 0);
// 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 last + 1; }
// Return the offset of the last xref table.
Guint 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 false if unknown or file is not damaged.
GBool getStreamEnd(Guint streamStart, Guint *streamEnd);
// Direct access.
int getSize() { return size; }
XRefEntry *getEntry(int i) { return &entries[i]; }
Object *getTrailerDict() { return &trailerDict; }
private:
BaseStream *str; // input stream
Guint start; // offset in file (to allow for garbage
// at beginning of file)
XRefEntry *entries; // xref entries
int size; // size of <entries> array
int last; // last used index in <entries>
int rootNum, rootGen; // catalog dict
GBool ok; // true if xref table is valid
int errCode; // error code (if <ok> is false)
Object trailerDict; // trailer dictionary
Guint lastXRefPos; // offset of last xref table
Guint *streamEnds; // 'endstream' positions - only used in
// damaged files
int streamEndsLen; // number of valid entries in streamEnds
ObjectStream *objStr; // cached object stream
GBool encrypted; // true if file is encrypted
int permFlags; // permission bits
GBool ownerPasswordOk; // true if owner password is correct
Guchar fileKey[32]; // file decryption key
int keyLength; // length of key, in bytes
int encVersion; // encryption version
CryptAlgorithm encAlgorithm; // encryption algorithm
Guint getStartXref();
GBool readXRef(Guint *pos);
GBool readXRefTable(Parser *parser, Guint *pos);
GBool readXRefStreamSection(Stream *xrefStr, int *w, int first, int n);
GBool readXRefStream(Stream *xrefStr, Guint *pos);
GBool constructXRef();
Guint strToUnsigned(char *s);
};
#endif
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