// license:BSD-3-Clause // copyright-holders:Dirk Best /*************************************************************************** Spectravideo SVI-318/328 Disk image format ***************************************************************************/ #include "svi_dsk.h" #include "ioprocs.h" svi_format::svi_format() { } const char *svi_format::name() const noexcept { return "svi"; } const char *svi_format::description() const noexcept { return "SVI-318/328 disk image"; } const char *svi_format::extensions() const noexcept { return "dsk"; } int svi_format::identify(util::random_read &io, uint32_t form_factor, const std::vector &variants) const { uint64_t size; if (io.length(size)) return 0; if (size == 172032 || size == 346112) return FIFID_SIZE; return 0; } bool svi_format::load(util::random_read &io, uint32_t form_factor, const std::vector &variants, floppy_image &image) const { uint64_t size; if (io.length(size)) return false; int head_count; switch (size) { case 172032: head_count = 1; break; case 346112: head_count = 2; break; default: return false; } if (io.seek(0, SEEK_SET)) return false; for (int track = 0; track < 40; track++) { for (int head = 0; head < head_count ; head++) { int sector_count = (track == 0 && head == 0) ? 18 : 17; int sector_size = (track == 0 && head == 0) ? 128 : 256; desc_pc_sector sectors[20]; uint8_t sector_data[5000]; int sector_offset = 0; for (int i = 0; i < sector_count; i++) { sectors[i].track = track; sectors[i].head = head; sectors[i].sector = i + 1; sectors[i].actual_size = sector_size; sectors[i].size = sector_size >> 8; sectors[i].deleted = false; sectors[i].bad_crc = false; sectors[i].data = §or_data[sector_offset]; /*auto const [err, actual] =*/ read(io, sectors[i].data, sector_size); // FIXME: check for errors and premature EOF sector_offset += sector_size; } if (track == 0 && head == 0) build_wd_track_fm(track, head, image, 50000, sector_count, sectors, 10, 26, 11); else build_wd_track_mfm(track, head, image, 100000, sector_count, sectors, 32, 50, 22); } } return true; } bool svi_format::save(util::random_read_write &io, const std::vector &variants, const floppy_image &image) const { if (io.seek(0, SEEK_SET)) return false; int track_count, head_count; image.get_actual_geometry(track_count, head_count); // initial fm track auto bitstream = generate_bitstream_from_track(0, 0, 4000, image); auto sectors = extract_sectors_from_bitstream_fm_pc(bitstream); for (int i = 0; i < 18; i++) { /*auto const [err, actual] =*/ write(io, sectors[i + 1].data(), 128); // FIXME: check for errors } // rest are mfm tracks for (int track = 0; track < track_count; track++) { for (int head = 0; head < head_count; head++) { // skip track 0, head 0 if (track == 0) { if (head_count == 1) break; else head++; } bitstream = generate_bitstream_from_track(track, head, 2000, image); sectors = extract_sectors_from_bitstream_mfm_pc(bitstream); for (int i = 0; i < 17; i++) { /*auto const [err, actual] =*/ write(io, sectors[i + 1].data(), 256); // FIXME: check for errors } } } return true; } bool svi_format::supports_save() const noexcept { return true; } const svi_format FLOPPY_SVI_FORMAT;