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https://github.com/davidgiven/fluxengine.git
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97 lines
2.2 KiB
C++
97 lines
2.2 KiB
C++
#ifndef IBM_H
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#define IBM_H
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#include "decoders/decoders.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(unsigned sectorBase):
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_sectorBase(sectorBase)
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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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private:
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unsigned _sectorBase;
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unsigned _currentSectorSize;
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unsigned _currentHeaderLength;
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};
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#if 0
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class AbstractIbmDecoder : public AbstractSoftSectorDecoder
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{
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public:
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AbstractIbmDecoder(unsigned sectorIdBase):
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_sectorIdBase(sectorIdBase)
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{}
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virtual ~AbstractIbmDecoder() {}
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SectorVector decodeToSectors(const RawRecordVector& rawRecords, unsigned physicalTrack, unsigned physicalSide);
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protected:
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virtual int skipHeaderBytes() const = 0;
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private:
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unsigned _sectorIdBase;
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};
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class IbmFmDecoder : public AbstractIbmDecoder
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{
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public:
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IbmFmDecoder(unsigned sectorIdBase):
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AbstractIbmDecoder(sectorIdBase)
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{}
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int recordMatcher(uint64_t fifo) const;
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protected:
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int skipHeaderBytes() const
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{ return 0; }
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};
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class IbmMfmDecoder : public AbstractIbmDecoder
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{
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public:
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IbmMfmDecoder(unsigned sectorIdBase):
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AbstractIbmDecoder(sectorIdBase)
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{}
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nanoseconds_t guessClock(Fluxmap& fluxmap) const;
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int recordMatcher(uint64_t fifo) const;
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protected:
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int skipHeaderBytes() const
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{ return 3; }
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};
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#endif
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#endif
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