cbvsreader.h

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#ifndef cbvsreader_h
#define cbvsreader_h

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        A.H.Bril
 Date:          12-3-2001
 Contents:      Common Binary Volume Storage format header
 RCS:           $Id$
________________________________________________________________________

-*/

#include "generalmod.h"
#include "cbvsio.h"
#include "cbvsinfo.h"
#include "datainterp.h"
#include "trckeyzsampling.h"

class TraceData;



mExpClass(General) CBVSReader : public CBVSIO
{
public:

                        CBVSReader(od_istream*,bool glob_info_only=false,
                                        bool forceusecbvsinfo=false);
                        ~CBVSReader();

    const CBVSInfo&     info() const            { return info_; }
    int                 bytesOverheadPerTrace() const;
    void                close();
    BinID               nextBinID() const;      

    bool                goTo(const BinID&);
    bool                toStart();
    bool                toNext();

    bool                hasAuxInfo() const      { return auxnrbytes_; }
    bool                getAuxInfo(PosAuxInfo&);
    bool                fetch(void** buffers,const bool* comps=0,
                                const Interval<int>* samps=0,
                                int offs=0);
    bool                fetch(TraceData& buffers,const bool* comps=0,
                                const Interval<int>* samps=0,
                                int offs=0);

    static const char*  check(od_istream&);

    int                 trcNrAtPosition() const { return idxatpos_; }

    const TypeSet<Coord>& trailerCoords() const { return trailercoords_; }

    static int          defHeaderSize()         { return 52; }

protected:

    od_istream&         strm_;
    CBVSInfo            info_;

    void                getAuxInfoSel(const char*);
    bool                readComps();
    bool                readGeom(bool);
    bool                readTrailer();
    void                getText(int,BufferString&);
    void                toOffs(od_int64);
    int                 getPosNr(const PosInfo::CubeDataPos&,bool) const;
    Coord               getTrailerCoord(const BinID&) const;
    void                mkPosNrs();

private:

    bool                hinfofetched_;
    int                 bytespertrace_;
    BinID               firstbinid_;
    int                 idxatpos_;
    int                 auxnrbytes_;
    DataInterpreter<int> iinterp_;
    DataInterpreter<float> finterp_;
    DataInterpreter<double> dinterp_;
    TrcKeySampling              hs_;
    Interval<int>       samprg_;
    TypeSet<int>        posnrs_;

    bool                readInfo(bool,bool);
    od_int64            lastposfo_;
    od_int64            datastartfo_;

    friend class        CBVSReadMgr;
    mutable PosInfo::CubeDataPos curgeomcubepos_;
    mutable PosInfo::CubeDataPos curldscubepos_;
    CoordPol            coordPol() const        { return coordpol_; }

    void                setCubePos(bool fromgeom) const;
    void                updCurBinID() const;

};


#endif