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78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
#ifndef IBM_H
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#define IBM_H
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#include "decoders/decoders.h"
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#include "encoders/encoders.h"
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#include "arch/ibm/ibm.pb.h"
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/* IBM format (i.e. ordinary PC floppies). */
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#define IBM_MFM_SYNC 0xA1 /* sync byte for MFM */
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#define IBM_IAM 0xFC /* start-of-track record */
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#define IBM_IAM_LEN 1 /* plus prologue */
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#define IBM_IDAM 0xFE /* sector header */
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#define IBM_IDAM_LEN 7 /* plus prologue */
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#define IBM_DAM1 0xF8 /* sector data (type 1) */
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#define IBM_DAM2 0xFB /* sector data (type 2) */
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#define IBM_TRS80DAM1 0xF9 /* sector data (TRS-80 directory) */
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#define IBM_TRS80DAM2 0xFA /* sector data (TRS-80 directory) */
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#define IBM_DAM_LEN 1 /* plus prologue and user data */
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/* Length of a DAM record is determined by the previous sector header. */
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struct IbmIdam
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{
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uint8_t id;
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uint8_t cylinder;
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uint8_t side;
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uint8_t sector;
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uint8_t sectorSize;
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uint8_t crc[2];
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};
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class IbmDecoder : public AbstractDecoder
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{
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public:
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IbmDecoder(const IbmDecoderProto& config):
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_config(config)
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{}
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RecordType advanceToNextRecord();
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void decodeSectorRecord();
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void decodeDataRecord();
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std::set<unsigned> requiredSectors(Track& track) const;
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private:
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const IbmDecoderProto& _config;
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unsigned _currentSectorSize;
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unsigned _currentHeaderLength;
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};
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class IbmEncoder : public AbstractEncoder
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{
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public:
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IbmEncoder(const IbmEncoderProto& config):
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_config(config)
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{}
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virtual ~IbmEncoder() {}
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public:
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std::unique_ptr<Fluxmap> encode(int physicalTrack, int physicalSide, const SectorSet& allSectors);
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private:
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void writeRawBits(uint32_t data, int width);
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void writeSync();
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void getTrackFormat(IbmEncoderProto::TrackdataProto& format, unsigned track, unsigned side);
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private:
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const IbmEncoderProto& _config;
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std::vector<bool> _bits;
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unsigned _cursor;
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bool _lastBit;
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};
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#endif
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