// license:GPL-2.0+ // copyright-holders:Dirk Best /*************************************************************************** Spectravideo SVI-318/328 Disk image format ***************************************************************************/ #include "svi_dsk.h" svi_format::svi_format() { } const char *svi_format::name() const { return "svi"; } const char *svi_format::description() const { return "SVI-318/328 disk image"; } const char *svi_format::extensions() const { return "dsk"; } int svi_format::identify(io_generic *io, uint32_t form_factor) { uint64_t size = io_generic_size(io); if (size == 172032 || size == 346112) return 50; return 0; } bool svi_format::load(io_generic *io, uint32_t form_factor, floppy_image *image) { uint64_t size = io_generic_size(io); int head_count; switch (size) { case 172032: head_count = 1; break; case 346112: head_count = 2; break; default: return false; } int file_offset = 0; 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]; io_generic_read(io, sectors[i].data, file_offset, sector_size); sector_offset += sector_size; file_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(io_generic *io, floppy_image *image) { uint8_t bitstream[500000/8]; uint8_t sector_data[50000]; desc_xs sectors[256]; int track_size; uint64_t file_offset = 0; int track_count, head_count; image->get_actual_geometry(track_count, head_count); // initial fm track generate_bitstream_from_track(0, 0, 4000, bitstream, track_size, image); extract_sectors_from_bitstream_fm_pc(bitstream, track_size, sectors, sector_data, sizeof(sector_data)); for (int i = 0; i < 18; i++) { io_generic_write(io, sectors[i + 1].data, file_offset, 128); file_offset += 128; } // 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++; } generate_bitstream_from_track(track, head, 2000, bitstream, track_size, image); extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sector_data, sizeof(sector_data)); for (int i = 0; i < 17; i++) { io_generic_write(io, sectors[i + 1].data, file_offset, 256); file_offset += 256; } } } return true; } bool svi_format::supports_save() const { return true; } const floppy_format_type FLOPPY_SVI_FORMAT = &floppy_image_format_creator;