// license:BSD-3-Clause // copyright-holders:Nathan Woods /********************************************************************* formats/pc_dsk.c PC disk images *********************************************************************/ #include #include #include "formats/pc_dsk.h" #include "formats/basicdsk.h" struct pc_disk_sizes { uint32_t image_size; int sectors; int heads; }; static const struct pc_disk_sizes disk_sizes[] = { { 8*1*40*512, 8, 1}, /* 5 1/4 inch double density single sided */ { 8*2*40*512, 8, 2}, /* 5 1/4 inch double density */ { 9*1*40*512, 9, 1}, /* 5 1/4 inch double density single sided */ { 9*2*40*512, 9, 2}, /* 5 1/4 inch double density */ {10*2*40*512, 10, 2}, /* 5 1/4 inch double density single sided */ { 9*2*80*512, 9, 2}, /* 80 tracks 5 1/4 inch drives rare in PCs */ { 9*2*80*512, 9, 2}, /* 3 1/2 inch double density */ {15*2*80*512, 15, 2}, /* 5 1/4 inch high density (or japanese 3 1/2 inch high density) */ {18*2*80*512, 18, 2}, /* 3 1/2 inch high density */ {21*2*80*512, 21, 2}, /* 3 1/2 inch high density DMF */ {36*2*80*512, 36, 2} /* 3 1/2 inch enhanced density */ }; static floperr_t pc_dsk_compute_geometry(floppy_image_legacy *floppy, struct basicdsk_geometry *geometry) { int i; uint64_t size; memset(geometry, 0, sizeof(*geometry)); size = floppy_image_size(floppy); for (i = 0; i < ARRAY_LENGTH(disk_sizes); i++) { if (disk_sizes[i].image_size == size) { geometry->sectors = disk_sizes[i].sectors; geometry->heads = disk_sizes[i].heads; geometry->sector_length = 512; geometry->first_sector_id = 1; geometry->tracks = (int) (size / disk_sizes[i].sectors / disk_sizes[i].heads / geometry->sector_length); return FLOPPY_ERROR_SUCCESS; } } if (size >= 0x1a) { /* * get info from boot sector. * not correct on all disks */ uint8_t scl, spt, heads; floppy_image_read(floppy, &scl, 0x0c, 1); floppy_image_read(floppy, &spt, 0x18, 1); floppy_image_read(floppy, &heads, 0x1A, 1); if (size == ((uint64_t) scl) * spt * heads * 0x200) { geometry->sectors = spt; geometry->heads = heads; geometry->sector_length = 512; geometry->first_sector_id = 1; geometry->tracks = scl; return FLOPPY_ERROR_SUCCESS; } } return FLOPPY_ERROR_SUCCESS; } static FLOPPY_IDENTIFY(pc_dsk_identify) { floperr_t err; struct basicdsk_geometry geometry; err = pc_dsk_compute_geometry(floppy, &geometry); if (err) return err; *vote = geometry.heads ? 100 : 0; return FLOPPY_ERROR_SUCCESS; } static FLOPPY_CONSTRUCT(pc_dsk_construct) { floperr_t err; struct basicdsk_geometry geometry; if (params) { /* create */ memset(&geometry, 0, sizeof(geometry)); geometry.heads = params->lookup_int(PARAM_HEADS); geometry.tracks = params->lookup_int(PARAM_TRACKS); geometry.sectors = params->lookup_int(PARAM_SECTORS); geometry.first_sector_id = 1; geometry.sector_length = 512; } else { /* open */ err = pc_dsk_compute_geometry(floppy, &geometry); if (err) return err; } return basicdsk_construct(floppy, &geometry); } /* ----------------------------------------------------------------------- */ LEGACY_FLOPPY_OPTIONS_START( pc ) LEGACY_FLOPPY_OPTION( pc_dsk, "dsk,ima,img,ufi,360", "PC floppy disk image", pc_dsk_identify, pc_dsk_construct, nullptr, HEADS([1]-2) TRACKS(40/[80]) SECTORS(8/[9]/10/15/18/36)) LEGACY_FLOPPY_OPTIONS_END pc_format::pc_format() : upd765_format(formats) { } const char *pc_format::name() const { return "pc"; } const char *pc_format::description() const { return "PC floppy disk image"; } const char *pc_format::extensions() const { return "dsk,ima,img,ufi,360"; } int pc_format::identify(io_generic *io, uint32_t form_factor) { uint64_t size = io_generic_size(io); /* some 360K images have a 512-byte header */ if (size == 368640 + 0x200) { file_header_skip_bytes = 0x200; } /* some 1.44MB images have a 1024-byte footer */ if (size == 1474560 + 0x400) { file_footer_skip_bytes = 0x400; } return upd765_format::identify(io, form_factor); } const pc_format::format pc_format::formats[] = { { /* 160K 5 1/4 inch double density single sided */ floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM, 2000, 8, 40, 1, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 320K 5 1/4 inch double density */ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 8, 40, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 180K 5 1/4 inch double density single sided */ floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM, 2000, 9, 40, 1, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 360K 5 1/4 inch double density */ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 9, 40, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 360K 5 1/4 inch double density, 41 tracks */ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 9, 41, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 360K 5 1/4 inch double density, 42 tracks */ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 9, 42, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 400K 5 1/4 inch double density - gaps unverified */ floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM, 2000, 10, 40, 2, 512, {}, 1, {}, 80, 50, 22, 36 }, { /* 720K 5 1/4 inch quad density - gaps unverified */ floppy_image::FF_525, floppy_image::DSQD, floppy_image::MFM, 2000, 9, 80, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 1200K 5 1/4 inch high density */ floppy_image::FF_525, floppy_image::DSHD, floppy_image::MFM, 1200, 15, 80, 2, 512, {}, 1, {}, 80, 50, 22, 84 }, { /* 720K 3 1/2 inch double density */ floppy_image::FF_35, floppy_image::DSDD, floppy_image::MFM, 2000, 9, 80, 2, 512, {}, 1, {}, 80, 50, 22, 80 }, { /* 1200K 3 1/2 inch high density (japanese variant) - gaps unverified */ floppy_image::FF_35, floppy_image::DSHD, floppy_image::MFM, 1000, 15, 80, 2, 512, {}, 1, {}, 80, 50, 22, 84 }, { /* 1440K 3 1/2 inch high density */ floppy_image::FF_35, floppy_image::DSHD, floppy_image::MFM, 1000, 18, 80, 2, 512, {}, 1, {}, 80, 50, 22, 108 }, { /* Microsoft DMF 1680K 3 1/2 inch high density - gaps unverified */ floppy_image::FF_35, floppy_image::DSHD, floppy_image::MFM, 1000, 21, 80, 2, 512, {}, 1, {}, 80, 50, 22, 0xc }, { /* 2880K 3 1/2 inch extended density - gaps unverified */ floppy_image::FF_35, floppy_image::DSED, floppy_image::MFM, 500, 36, 80, 2, 512, {}, 1, {}, 80, 50, 41, 80 }, {} }; const floppy_format_type FLOPPY_PC_FORMAT = &floppy_image_format_creator;