// license:LGPL-2.1+ // copyright-holders:Michael Zapf /********************************************************************* formats/ti99_dsk.c TI99 and Geneve disk images Michael Zapf, Sept 2014 *********************************************************************/ #ifndef TI99_DSK_H #define TI99_DSK_H #include "flopimg.h" #include "wd177x_dsk.h" class ti99_floppy_format : public floppy_image_format_t { public: bool supports_save() const override { return true; } bool load(io_generic *io, uint32_t form_factor, floppy_image *image) override; bool save(io_generic *io, floppy_image *image) override; protected: int decode_bitstream(const uint8_t *bitstream, uint8_t *trackdata, int *sector, int cell_count, int encoding, uint8_t gapbytes, int track_size); uint8_t get_data_from_encoding(uint16_t raw); virtual int min_heads() =0; virtual void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads, int& tracks) =0; virtual int get_track_size(int cell_size, int sector_count) =0; virtual void load_track(io_generic *io, uint8_t *trackdata, int head, int track, int acttrack, int sectorcount, int trackcount, int cellsize) =0; virtual void write_track(io_generic *io, uint8_t *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes) =0; int get_encoding(int cell_size); void generate_track_fm(int track, int head, int cell_size, uint8_t* trackdata, floppy_image *image); void generate_track_mfm(int track, int head, int cell_size, uint8_t* trackdata, floppy_image *image); bool check_for_address_marks(uint8_t* trackdata, int encoding); // Debugging void showtrack(uint8_t* trackdata, int length); }; /* Implementation of the sector dump format. */ class ti99_sdf_format : public ti99_floppy_format { public: int identify(io_generic *io, uint32_t form_factor) override; const char *name() const override; const char *description() const override; const char *extensions() const override; private: void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads, int& tracks) override; int get_track_size(int cell_size, int sector_count) override; void write_track(io_generic *io, uint8_t *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes) override; void load_track(io_generic *io, uint8_t *trackdata, int head, int track, int acttrack, int sectorcount, int trackcount, int cellsize) override; // This format supports single-sided images int min_heads() override { return 1; } struct ti99vib { char name[10]; // volume name (10 characters, pad with spaces) uint8_t totsecsMSB; // disk length in sectors (big-endian) (usually 360, 720 or 1440) uint8_t totsecsLSB; uint8_t secspertrack; // sectors per track (usually 9 (FM) or 18 (MFM)) uint8_t id[3]; // String "DSK" uint8_t protection; // 'P' if disk is protected, ' ' otherwise. uint8_t tracksperside; // tracks per side (usually 40) uint8_t sides; // sides (1 or 2) uint8_t density; // 0,1 (FM) or 2,3,4 (MFM) uint8_t res[36]; // Empty for traditional disks, or up to 3 directory pointers uint8_t abm[200]; // allocation bitmap: a 1 for each sector in use (sector 0 is LSBit of byte 0, // sector 7 is MSBit of byte 0, sector 8 is LSBit of byte 1, etc.) }; }; extern const floppy_format_type FLOPPY_TI99_SDF_FORMAT; /* Implementation of the track dump format. */ class ti99_tdf_format : public ti99_floppy_format { public: int identify(io_generic *io, uint32_t form_factor) override; const char *name() const override; const char *description() const override; const char *extensions() const override; private: void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads, int& tracks) override; void load_track(io_generic *io, uint8_t *trackdata, int head, int track, int acttrack, int sectorcount, int trackcount, int cellsize) override; void write_track(io_generic *io, uint8_t *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes) override; int get_track_size(int cell_size, int sector_count) override; // This format only supports double-sided images int min_heads() override { return 2; } }; extern const floppy_format_type FLOPPY_TI99_TDF_FORMAT; #endif /* TI99_DSK_H */