fluxengine/lib/decoders/decoders.h

#ifndef DECODERS_H
#define DECODERS_H

#include "bytes.h"
#include "sector.h"
#include "decoders/fluxmapreader.h"
#include "decoders/fluxdecoder.h"

class Sector;
class Fluxmap;
class FluxmapReader;
class RawBits;
class DecoderProto;

#include "flux.h"

extern void setDecoderManualClockRate(double clockrate_us);

extern Bytes decodeFmMfm(std::vector<bool>::const_iterator start,
    std::vector<bool>::const_iterator end);
extern void encodeMfm(std::vector<bool>& bits, unsigned& cursor, const Bytes& input, bool& lastBit);
extern void encodeFm(std::vector<bool>& bits, unsigned& cursor, const Bytes& input);
extern Bytes encodeMfm(const Bytes& input, bool& lastBit);

static inline Bytes decodeFmMfm(const std::vector<bool> bits)
{ return decodeFmMfm(bits.begin(), bits.end()); }

class AbstractDecoder
{
public:
	AbstractDecoder(const DecoderProto& config):
		_config(config)
	{}

    virtual ~AbstractDecoder() {}

	static std::unique_ptr<AbstractDecoder> create(const DecoderProto& config);

public:
    enum RecordType
    {
        SECTOR_RECORD,
        DATA_RECORD,
        UNKNOWN_RECORD
    };

public:
    std::unique_ptr<TrackDataFlux> decodeToSectors(std::shared_ptr<const Fluxmap> fluxmap, unsigned cylinder, unsigned head);
    void pushRecord(const Fluxmap::Position& start, const Fluxmap::Position& end);

	void resetFluxDecoder();
    std::vector<bool> readRawBits(unsigned count);

    Fluxmap::Position tell()
    { return _fmr->tell(); } 

    void seek(const Fluxmap::Position& pos)
    { return _fmr->seek(pos); } 

    bool eof() const
    { return _fmr->eof(); }

	virtual std::set<unsigned> requiredSectors(unsigned cylinder, unsigned head) const;

protected:
    virtual void beginTrack() {};
    virtual RecordType advanceToNextRecord() = 0;
    virtual void decodeSectorRecord() = 0;
    virtual void decodeDataRecord() {};

	const DecoderProto& _config;
    FluxmapReader* _fmr = nullptr;
	std::unique_ptr<TrackDataFlux> _trackdata;
    std::shared_ptr<Sector> _sector;
	std::unique_ptr<FluxDecoder> _decoder;
};

#endif