// license:GPL-2.0+
// copyright-holders:Dirk Best, Nigel Barnes
/***************************************************************************
Acorn - BBC Micro, Electron, Archimedes
Disk image formats
***************************************************************************/
#include "acorn_dsk.h"
acorn_ssd_format::acorn_ssd_format() : wd177x_format(formats)
{
}
const char *acorn_ssd_format::name() const
{
return "ssd";
}
const char *acorn_ssd_format::description() const
{
return "Acorn SSD disk image";
}
const char *acorn_ssd_format::extensions() const
{
return "ssd,bbc,img";
}
int acorn_ssd_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t cat[8];
uint32_t sectors0, sectors2;
uint64_t size = io_generic_size(io);
for(int i=0; formats[i].form_factor; i++) {
const format &f = formats[i];
if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
// test for Torch CPN - test pattern at sector &0018
io_generic_read(io, cat, 0x32800, 8);
if (memcmp(cat, "\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd", 4) == 0 && size == (uint64_t)compute_track_size(f) * f.track_count * f.head_count)
return i;
// read sector count from side 0 catalogue
io_generic_read(io, cat, 0x100, 8);
sectors0 = ((cat[6] & 3) << 8) + cat[7];
LOG_FORMATS("ssd: sector count 0: %d %s\n", sectors0, sectors0 % 10 != 0 ? "invalid" : "");
if ((size <= (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && (sectors0 <= f.track_count * f.sector_count)) {
if (f.head_count == 2)
{
// read sector count from side 2 catalogue
io_generic_read(io, cat, compute_track_size(f) * f.track_count + 0x100, 8); // sequential
sectors2 = ((cat[6] & 3) << 8) + cat[7];
// exception case for Acorn CP/M System Disc 1
io_generic_read(io, cat, 0x367ec, 8);
if (memcmp(cat, "/M ", 4) == 0) sectors2 = ((cat[6] & 3) << 8) + cat[7];
LOG_FORMATS("ssd: sector count 2: %d %s\n", sectors2, sectors2 % 10 != 0 ? "invalid" : "");
}
else
{
sectors2 = sectors0;
}
if (sectors0 > 0 && sectors0 % 10 == 0 && sectors2 > 0 && sectors2 % 10 == 0 && size <= (sectors0 + sectors2) * 256)
return i;
}
}
LOG_FORMATS("ssd: no match\n");
return -1;
}
int acorn_ssd_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if(type != -1)
return 90;
return 0;
}
int acorn_ssd_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const acorn_ssd_format::format acorn_ssd_format::formats[] =
{
{ // 100k 40 track single sided single density
floppy_image::FF_525, floppy_image::SSSD, floppy_image::FM,
4000, 10, 40, 1, 256, {}, 0, {}, 40, 10, 10
},
{ // 200k 80 track single sided single density
floppy_image::FF_525, floppy_image::SSQD, floppy_image::FM,
4000, 10, 80, 1, 256, {}, 0, {}, 40, 10, 10
},
{ // 200k 40 track double sided single density
floppy_image::FF_525, floppy_image::DSSD, floppy_image::FM,
4000, 10, 40, 2, 256, {}, 0, {}, 40, 10, 10
},
{ // 400k 80 track double sided single density
floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM,
4000, 10, 80, 2, 256, {}, 0, {}, 40, 10, 10
},
{ // 100k 40 track single sided single density
floppy_image::FF_35, floppy_image::SSSD, floppy_image::FM,
4000, 10, 40, 1, 256,{}, 0,{}, 40, 10, 10
},
{ // 200k 80 track single sided single density
floppy_image::FF_35, floppy_image::SSDD, floppy_image::FM,
4000, 10, 80, 1, 256,{}, 0,{}, 40, 10, 10
},
{ // 200k 40 track double sided single density
floppy_image::FF_35, floppy_image::DSSD, floppy_image::FM,
4000, 10, 40, 2, 256,{}, 0,{}, 40, 10, 10
},
{ // 400k 80 track double sided single density
floppy_image::FF_35, floppy_image::DSDD, floppy_image::FM,
4000, 10, 80, 2, 256,{}, 0,{}, 40, 10, 10
},
{ // 100k 40 track single sided single density
floppy_image::FF_3, floppy_image::SSSD, floppy_image::FM,
4000, 10, 40, 1, 256,{}, 0,{}, 40, 10, 10
},
{}
};
acorn_dsd_format::acorn_dsd_format() : wd177x_format(formats)
{
}
const char *acorn_dsd_format::name() const
{
return "dsd";
}
const char *acorn_dsd_format::description() const
{
return "Acorn DSD disk image";
}
const char *acorn_dsd_format::extensions() const
{
return "dsd";
}
int acorn_dsd_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t cat[8];
uint32_t sectors0, sectors2;
uint64_t size = io_generic_size(io);
for (int i = 0; formats[i].form_factor; i++) {
const format &f = formats[i];
if (form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
// test for Torch CPN - test pattern at sector &0018
io_generic_read(io, cat, 0x1200, 8);
if (memcmp(cat, "\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd", 4) == 0 && size == (uint64_t)compute_track_size(f) * f.track_count * f.head_count)
return i;
// read sector count from side 0 catalogue
io_generic_read(io, cat, 0x100, 8);
sectors0 = ((cat[6] & 3) << 8) + cat[7];
LOG_FORMATS("dsd: sector count 0: %d %s\n", sectors0, sectors0 % 10 != 0 ? "invalid" : "");
if ((size <= (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && (sectors0 <= f.track_count * f.sector_count)) {
// read sector count from side 2 catalogue
io_generic_read(io, cat, 0xb00, 8); // interleaved
sectors2 = ((cat[6] & 3) << 8) + cat[7];
// exception case for Acorn CP/M System Disc 1
io_generic_read(io, cat, 0x97ec, 8);
if (memcmp(cat, "/M ", 4) == 0) sectors2 = ((cat[6] & 3) << 8) + cat[7];
LOG_FORMATS("dsd: sector count 2: %d %s\n", sectors2, sectors2 % 10 != 0 ? "invalid" : "");
if (sectors0 > 0 && sectors0 % 10 == 0 && sectors2 > 0 && sectors2 % 10 == 0 && size <= (sectors0 + sectors2) * 256)
return i;
}
}
LOG_FORMATS("dsd: no match\n");
return -1;
}
int acorn_dsd_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if (type != -1)
return 90;
return 0;
}
int acorn_dsd_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const acorn_dsd_format::format acorn_dsd_format::formats[] =
{
{ // 400k 80 track double sided single density (interleaved)
floppy_image::FF_525, floppy_image::DSQD, floppy_image::FM,
4000, 10, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10
},
{ // 200k 40 track double sided single density (interleaved)
floppy_image::FF_525, floppy_image::DSSD, floppy_image::FM,
4000, 10, 40, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10
},
{ // 400k 80 track double sided single density (interleaved)
floppy_image::FF_35, floppy_image::DSDD, floppy_image::FM,
4000, 10, 80, 2, 256,{}, -1,{ 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10
},
{ // 200k 40 track double sided single density (interleaved)
floppy_image::FF_35, floppy_image::DSSD, floppy_image::FM,
4000, 10, 40, 2, 256,{}, -1,{ 0,1,2,3,4,5,6,7,8,9 }, 40, 10, 10
},
{}
};
opus_ddos_format::opus_ddos_format() : wd177x_format(formats)
{
}
const char *opus_ddos_format::name() const
{
return "ddos";
}
const char *opus_ddos_format::description() const
{
return "Opus DDOS disk image";
}
const char *opus_ddos_format::extensions() const
{
return "dds";
}
int opus_ddos_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t cat[8];
uint32_t sectors0, sectors2;
// read sector count from side 0 catalogue
io_generic_read(io, cat, 0x1000, 8);
sectors0 = (cat[1] << 8) + cat[2];
LOG_FORMATS("ddos: sector count 0: %d %s\n", sectors0, sectors0 % 18 != 0 ? "invalid" : "");
uint64_t size = io_generic_size(io);
for (int i = 0; formats[i].form_factor; i++) {
const format &f = formats[i];
if (form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
if ((size <= (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && (sectors0 <= f.track_count * f.sector_count)) {
if (f.head_count == 2)
{
// read sector count from side 2 catalogue
io_generic_read(io, cat, compute_track_size(f) * f.track_count + 0x1000, 8); // sequential
sectors2 = (cat[1] << 8) + cat[2];
LOG_FORMATS("ddos: sector count 2: %d %s\n", sectors2, sectors2 % 18 != 0 ? "invalid" : "");
}
else
{
sectors2 = sectors0;
}
if (sectors0 % 18 == 0 && sectors2 % 18 == 0)
return i;
}
}
LOG_FORMATS("ddos: no match\n");
return -1;
}
int opus_ddos_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if (type != -1)
return 90;
return 0;
}
int opus_ddos_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const opus_ddos_format::format opus_ddos_format::formats[] =
{
{ // 180k 40 track single sided double density - gaps unverified
floppy_image::FF_525, floppy_image::SSSD, floppy_image::MFM,
4000, 18, 40, 1, 256, {}, 0, {}, 36, 22, 27
},
{ // 360k 80 track single sided double density - gaps unverified
floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
4000, 18, 80, 1, 256, {}, 0, {}, 36, 22, 27
},
{ // 360k 40 track double sided double density - gaps unverified
floppy_image::FF_525, floppy_image::DSSD, floppy_image::MFM,
4000, 18, 40, 2, 256, {}, 0, {}, 36, 22, 27
},
{ // 720k 80 track double sided double density - gaps unverified
floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
4000, 18, 80, 2, 256, {}, 0, {}, 36, 22, 27
},
{}
};
acorn_adfs_old_format::acorn_adfs_old_format() : wd177x_format(formats)
{
}
const char *acorn_adfs_old_format::name() const
{
return "adfs_o";
}
const char *acorn_adfs_old_format::description() const
{
return "Acorn ADFS (OldMap) disk image";
}
const char *acorn_adfs_old_format::extensions() const
{
return "adf,ads,adm,adl";
}
int acorn_adfs_old_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t map[3];
uint32_t sectors;
uint8_t oldmap[4];
// read sector count from free space map
io_generic_read(io, map, 0xfc, 3);
sectors = map[0] + (map[1] << 8) + (map[2] << 16);
LOG_FORMATS("adfs_o: sector count %d %s\n", sectors, sectors % 16 != 0 ? "invalid" : "");
// read map identifier
io_generic_read(io, oldmap, 0x201, 4);
LOG_FORMATS("adfs_o: map identifier %s %s\n", oldmap, memcmp(oldmap, "Hugo", 4) != 0 ? "invalid" : "");
uint64_t size = io_generic_size(io);
for(int i=0; formats[i].form_factor; i++) {
const format &f = formats[i];
if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
// valid images will have map identifier 'Hugo' and sector counts adfs-s = 0x280; adfs-m = 0x500; adfs-l = 0xa00; adfs-dos = 0xaa0; though many adfs-s images are incorrect
if ((size <= (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && memcmp(oldmap, "Hugo", 4) == 0 && (sectors == 0x280 || sectors == 0x500 || sectors == 0xa00 || sectors == 0xaa0 || size == 819200)) {
return i;
}
}
LOG_FORMATS("adfs_o: no match\n");
return -1;
}
int acorn_adfs_old_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if(type != -1)
return 100;
return 0;
}
int acorn_adfs_old_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const acorn_adfs_old_format::format acorn_adfs_old_format::formats[] =
{
{ // M - 320K 5 1/4 inch 80 track single sided double density
floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
2000, 16, 80, 1, 256, {}, 0, {}, 60, 22, 43
},
{ // S - 160K 5 1/4 inch 40 track single sided double density
floppy_image::FF_525, floppy_image::SSDD, floppy_image::MFM,
2000, 16, 40, 1, 256, {}, 0, {}, 60, 22, 43
},
{ // L - 640K 5 1/4 inch 80 track double sided double density (interleaved)
floppy_image::FF_525, floppy_image::DSDD, floppy_image::MFM,
2000, 16, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 }, 42, 22, 57
},
{ // M - 320K 3 1/2 inch 80 track single sided double density
floppy_image::FF_35, floppy_image::SSDD, floppy_image::MFM,
2000, 16, 80, 1, 256, {}, 0, {}, 60, 22, 43
},
{ // S - 160K 3 1/2 inch 40 track single sided double density
floppy_image::FF_35, floppy_image::SSDD, floppy_image::MFM,
2000, 16, 40, 1, 256, {}, 0, {}, 60, 22, 43
},
{ // L - 640K 3 1/2 inch 80 track double sided double density (interleaved)
floppy_image::FF_35, floppy_image::DSDD, floppy_image::MFM,
2000, 16, 80, 2, 256, {}, -1, { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 }, 42, 22, 57
},
{}
};
acorn_adfs_new_format::acorn_adfs_new_format() : wd177x_format(formats)
{
}
const char *acorn_adfs_new_format::name() const
{
return "adfs_n";
}
const char *acorn_adfs_new_format::description() const
{
return "Acorn ADFS (NewMap) disk image";
}
const char *acorn_adfs_new_format::extensions() const
{
return "adf";
}
int acorn_adfs_new_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t dform[4];
uint8_t eform[4];
// read map identifiers for D and E formats
io_generic_read(io, dform, 0x401, 4);
LOG_FORMATS("adfs_n: map identifier (D format) %s %s\n", dform, (memcmp(dform, "Hugo", 4) != 0 && memcmp(dform, "Nick", 4) != 0) ? "invalid" : "");
io_generic_read(io, eform, 0x801, 4);
LOG_FORMATS("adfs_n: map identifier (E format) %s %s\n", eform, memcmp(eform, "Nick", 4) != 0 ? "invalid" : "");
uint64_t size = io_generic_size(io);
for (int i = 0; formats[i].form_factor; i++) {
const format &f = formats[i];
if (form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
// no further checks for 1600K images
if ((size == (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && size == 0x190000) {
return i;
}
// valid 800K images will have map identifier Nick, Arthur D format still use Hugo
if ((size <= (uint64_t)compute_track_size(f) * f.track_count * f.head_count) && (memcmp(dform, "Hugo", 4) == 0 || memcmp(dform, "Nick", 4) == 0 || memcmp(eform, "Nick", 4) == 0)) {
return i;
}
}
LOG_FORMATS("adfs_n: no match\n");
return -1;
}
int acorn_adfs_new_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if (type != -1)
return 100;
return 0;
}
int acorn_adfs_new_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const acorn_adfs_new_format::format acorn_adfs_new_format::formats[] =
{
{ // D,E - 800K 3 1/2 inch 80 track double sided double density - gaps unverified
floppy_image::FF_35, floppy_image::DSDD, floppy_image::MFM,
2000, 5, 80, 2, 1024, {}, -1, { 0,1,2,3,4 }, 32, 22, 90
},
{ // F - 1600K 3 1/2 inch 80 track double sided quad density
floppy_image::FF_35, floppy_image::DSHD, floppy_image::MFM,
2000, 10, 80, 2, 1024, {}, -1, { 0,1,2,3,4,5,6,7,8,9 }, 50, 22, 90
},
{}
};
acorn_dos_format::acorn_dos_format() : wd177x_format(formats)
{
}
const char *acorn_dos_format::name() const
{
return "dos";
}
const char *acorn_dos_format::description() const
{
return "Acorn DOS disk image";
}
const char *acorn_dos_format::extensions() const
{
return "img";
}
int acorn_dos_format::find_size(io_generic *io, uint32_t form_factor)
{
uint8_t type;
uint64_t size = io_generic_size(io);
for(int i=0; formats[i].form_factor; i++) {
const format &f = formats[i];
if(form_factor != floppy_image::FF_UNKNOWN && form_factor != f.form_factor)
continue;
if (size == (uint64_t)compute_track_size(f) * f.track_count * f.head_count) {
// read media type ID from FAT - Acorn DOS = 0xfd
io_generic_read(io, &type, 0, 1);
LOG_FORMATS("dos: 800k media type id %02X %s\n", type, type != 0xfd ? "invalid" : "");
if (type == 0xfd) return i;
}
}
LOG_FORMATS("dos: no match\n");
return -1;
}
int acorn_dos_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if(type != -1)
return 90;
return 0;
}
int acorn_dos_format::get_image_offset(const format &f, int head, int track)
{
if (f.sector_base_id == -1)
return (track * f.head_count + head) * compute_track_size(f);
else
return (f.track_count * head + track) * compute_track_size(f);
}
const acorn_dos_format::format acorn_dos_format::formats[] =
{
{ // 800K 5 1/4 inch 80 track double sided double density - gaps unverified
floppy_image::FF_525, floppy_image::DSQD, floppy_image::MFM,
2000, 5, 80, 2, 1024, {}, -1, { 1,2,3,4,5 }, 32, 22, 90
},
{}
};
opus_ddcpm_format::opus_ddcpm_format()
{
}
const char *opus_ddcpm_format::name() const
{
return "ddcpm";
}
const char *opus_ddcpm_format::description() const
{
return "Opus DD CP/M disk image";
}
const char *opus_ddcpm_format::extensions() const
{
return "ssd";
}
bool opus_ddcpm_format::supports_save() const
{
return false;
}
int opus_ddcpm_format::identify(io_generic *io, uint32_t form_factor)
{
uint8_t h[8];
io_generic_read(io, h, 0, 8);
if (io_generic_size(io) == 819200 && memcmp(h, "Slogger ", 8) == 0)
return 100;
LOG_FORMATS("ddcpm: no match\n");
return 0;
}
bool opus_ddcpm_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
// Double density discs formatted with DDCPM :
//
// Tracks 0 - 2 formatted Single Density
// Tracks 3 - 159 formatted Double Density
//
// Single density tracks are 10 x 256 byte sectors per track
// Sector skew of 2
//
// Double Density tracks are 10 x 512 byte sectors per track
// Sector skew of 1
// Sector interleave of 2
//
int spt, bps;
for (int head = 0; head < 2; head++) {
for (int track = 0; track < 80; track++) {
bool mfm = track > 2 || head;
bps = mfm ? 512 : 256;
spt = 10;
desc_pc_sector sects[10];
uint8_t sectdata[10*512];
io_generic_read(io, sectdata, head * 80 * spt * 512 + track * spt * 512, spt * 512);
for (int i = 0; i < spt; i++) {
sects[i].track = track;
sects[i].head = head;
sects[i].sector = i;
sects[i].size = mfm ? 2 : 1;
sects[i].actual_size = bps;
sects[i].data = sectdata + i * 512;
sects[i].deleted = false;
sects[i].bad_crc = false;
}
if (mfm)
build_wd_track_mfm(track, head, image, 100000, 10, sects, 60, 43, 22);
else
build_wd_track_fm(track, head, image, 50000, 10, sects, 40, 10, 10);
}
}
return true;
}
bool opus_ddcpm_format::save(io_generic *io, floppy_image *image)
{
return false;
}
const floppy_format_type FLOPPY_ACORN_SSD_FORMAT = &floppy_image_format_creator<acorn_ssd_format>;
const floppy_format_type FLOPPY_ACORN_DSD_FORMAT = &floppy_image_format_creator<acorn_dsd_format>;
const floppy_format_type FLOPPY_ACORN_DOS_FORMAT = &floppy_image_format_creator<acorn_dos_format>;
const floppy_format_type FLOPPY_ACORN_ADFS_OLD_FORMAT = &floppy_image_format_creator<acorn_adfs_old_format>;
const floppy_format_type FLOPPY_ACORN_ADFS_NEW_FORMAT = &floppy_image_format_creator<acorn_adfs_new_format>;
const floppy_format_type FLOPPY_OPUS_DDOS_FORMAT = &floppy_image_format_creator<opus_ddos_format>;
const floppy_format_type FLOPPY_OPUS_DDCPM_FORMAT = &floppy_image_format_creator<opus_ddcpm_format>;