mirror of
https://github.com/davidgiven/fluxengine.git
synced 2025-10-31 11:17:01 -07:00
d25f96dd24
is formatted... but has trouble reading sectors above about 1000. Also remember that encoding MFM needs to keep one bit of state at all times.
94 lines
2.1 KiB
C++
94 lines
2.1 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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/* 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, bool ignoreSideByte=false):
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_sectorBase(sectorBase),
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_ignoreSideByte(ignoreSideByte)
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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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bool _ignoreSideByte;
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unsigned _currentSectorSize;
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unsigned _currentHeaderLength;
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};
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struct IbmParameters
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{
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int trackLengthMs;
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int sectorSize;
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bool emitIam;
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int startSectorId;
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int clockRateKhz;
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bool useFm;
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uint16_t idamByte;
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uint16_t damByte;
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int gap0;
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int gap1;
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int gap2;
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int gap3;
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std::string sectorSkew;
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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 IbmParameters& parameters):
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_parameters(parameters)
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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 writeBytes(const Bytes& bytes);
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void writeBytes(int count, uint8_t value);
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void writeSync();
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private:
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IbmParameters _parameters;
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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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