bool imd_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
UINT64 size = io_generic_size(io);
UINT8 *img = global_alloc_array(UINT8, size);
io_generic_read(io, img, 0, size);
UINT64 pos;
for(pos=0; pos < size && img[pos] != 0x1a; pos++);
pos++;
if(pos >= size)
return false;
while(pos < size) {
UINT8 mode = img[pos++];
UINT8 track = img[pos++];
UINT8 head = img[pos++];
UINT8 sector_count = img[pos++];
UINT8 ssize = img[pos++];
if(ssize == 0xff)
throw emu_fatalerror("imd_format: Unsupported variable sector size on track %d head %d", track, head);
UINT32 actual_size = ssize < 7 ? 128 << ssize : 8192;
static const int rates[3] = { 500000, 300000, 250000 };
bool fm = mode < 3;
int rate = rates[mode % 3];
int rpm = form_factor == floppy_image::FF_8 || (form_factor == floppy_image::FF_525 && rate >= 300000) ? 360 : 300;
int cell_count = (fm ? 1 : 2)*rate*60/rpm;
const UINT8 *snum = img+pos;
pos += sector_count;
const UINT8 *tnum = head & 0x80 ? img+pos : NULL;
if(tnum)
pos += sector_count;
const UINT8 *hnum = head & 0x40 ? img+pos : NULL;
if(hnum)
pos += sector_count;
head &= 0x3f;
int gap_3 = calc_default_pc_gap3_size(form_factor, actual_size);
desc_pc_sector sects[256];
for(int i=0; i<sector_count; i++) {
UINT8 stype = img[pos++];
sects[i].track = tnum ? tnum[i] : track;
sects[i].head = hnum ? hnum[i] : head;
sects[i].sector = snum[i];
sects[i].size = ssize;
sects[i].actual_size = actual_size;
if(stype == 0 || stype > 8) {
sects[i].data = NULL;
} else {
sects[i].deleted = stype == 3 || stype == 4 || stype == 7 || stype == 8;
sects[i].bad_crc = stype == 5 || stype == 6 || stype == 7 || stype == 8;
if(stype == 2 || stype == 4 || stype == 6 || stype == 8) {
sects[i].data = global_alloc_array(UINT8, actual_size);
memset(sects[i].data, img[pos++], actual_size);
} else {
sects[i].data = img + pos;
pos += actual_size;
}
}
}
if(fm)
build_pc_track_fm(track, head, image, cell_count, sector_count, sects, gap_3);
else
build_pc_track_mfm(track, head, image, cell_count, sector_count, sects, gap_3);
for(int i=0; i<sector_count; i++)
if(sects[i].data && (sects[i].data < img || sects[i].data >= img+size))
global_free(sects[i].data);
}
global_free(img);
return true;
}
bool td0_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
int track_count = 0;
int head_count = 0;
int track_spt;
int offset = 0;
const int max_size = 4*1024*1024; // 4MB ought to be large enough for any floppy
std::vector<uint8_t> imagebuf(max_size);
uint8_t header[12];
io_generic_read(io, header, 0, 12);
head_count = header[9];
if(header[0] == 't')
{
td0dsk_t disk_decode;
disk_decode.floppy_file = io;
disk_decode.init_Decode();
disk_decode.floppy_file_offset = 12;
disk_decode.Decode(&imagebuf[0], max_size);
}
else
io_generic_read(io, &imagebuf[0], 12, io_generic_size(io));
if(header[7] & 0x80)
offset = 10 + imagebuf[2] + (imagebuf[3] << 8);
track_spt = imagebuf[offset];
if(track_spt == 255) // Empty file?
return false;
switch(header[6])
{
case 2:
if((imagebuf[offset + 2] & 0x7f) == 2) // ?
{
if(head_count == 2)
image->set_variant(floppy_image::DSHD);
else
return false; // single side hd?
break;
}
/* no break; could be qd, won't know until tracks are counted */
case 1:
if(head_count == 2)
image->set_variant(floppy_image::DSDD);
else
image->set_variant(floppy_image::SSDD);
break;
case 4:
if((imagebuf[offset + 2] & 0x7f) == 2) // ?
{
if(head_count == 2)
image->set_variant(floppy_image::DSHD);
else
return false; // single side 3.5?
break;
} else
image->set_variant(floppy_image::SSDD);
break;
/* no break */
case 3:
if(head_count == 2)
{
if(form_factor == floppy_image::FF_525)
image->set_variant(floppy_image::DSQD);
else
image->set_variant(floppy_image::DSDD);
}
else
{
if(form_factor == floppy_image::FF_525)
image->set_variant(floppy_image::SSQD);
else
return false; // single side 3.5?
}
break;
}
static const int rates[3] = { 250000, 300000, 500000 };
int rate = (header[5] & 0x7f) >= 3 ? 500000 : rates[header[5] & 0x7f];
int rpm = form_factor == floppy_image::FF_8 || (form_factor == floppy_image::FF_525 && rate >= 300000) ? 360 : 300;
int base_cell_count = rate*60/rpm;
while(track_spt != 255)
{
desc_pc_sector sects[256];
uint8_t sect_data[65536];
int sdatapos = 0;
int track = imagebuf[offset + 1];
int head = imagebuf[offset + 2] & 1;
bool fm = (header[5] & 0x80) || (imagebuf[offset + 2] & 0x80); // ?
offset += 4;
for(int i = 0; i < track_spt; i++)
{
uint8_t *hs = &imagebuf[offset];
uint16_t size;
offset += 6;
sects[i].track = hs[0];
sects[i].head = hs[1];
sects[i].sector = hs[2];
sects[i].size = hs[3];
sects[i].deleted = (hs[4] & 4) == 4;
sects[i].bad_crc = (hs[4] & 2) == 2;
if(hs[4] & 0x30)
size = 0;
else
{
offset += 3;
size = 128 << hs[3];
int j, k;
switch(hs[8])
{
default:
return false;
case 0:
memcpy(§_data[sdatapos], &imagebuf[offset], size);
offset += size;
break;
case 1:
offset += 4;
k = (hs[9] + (hs[10] << 8)) * 2;
k = (k <= size) ? k : size;
for(j = 0; j < k; j += 2)
{
sect_data[sdatapos + j] = hs[11];
sect_data[sdatapos + j + 1] = hs[12];
}
if(k < size)
memset(§_data[sdatapos + k], '\0', size - k);
break;
case 2:
k = 0;
while(k < size)
{
uint16_t len = imagebuf[offset];
uint16_t rep = imagebuf[offset + 1];
offset += 2;
if(!len)
{
memcpy(§_data[sdatapos + k], &imagebuf[offset], rep);
offset += rep;
k += rep;
}
else
{
len = (1 << len);
rep = len * rep;
rep = ((rep + k) <= size) ? rep : (size - k);
for(j = 0; j < rep; j += len)
memcpy(§_data[sdatapos + j + k], &imagebuf[offset], len);
k += rep;
offset += len;
}
}
break;
}
}
sects[i].actual_size = size;
if(size)
{
sects[i].data = §_data[sdatapos];
sdatapos += size;
}
else
sects[i].data = nullptr;
}
track_count = track;
if(fm)
build_pc_track_fm(track, head, image, base_cell_count, track_spt, sects, calc_default_pc_gap3_size(form_factor, sects[0].actual_size));
else
build_pc_track_mfm(track, head, image, base_cell_count*2, track_spt, sects, calc_default_pc_gap3_size(form_factor, sects[0].actual_size));
track_spt = imagebuf[offset];
}
if((track_count > 50) && (form_factor == floppy_image::FF_525)) // ?
{
if(image->get_variant() == floppy_image::DSDD)
image->set_variant(floppy_image::DSQD);
else if(image->get_variant() == floppy_image::SSDD)
image->set_variant(floppy_image::SSQD);
}
return true;
}
bool dcp_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
UINT8 h[0xa2];
int heads, tracks, spt, bps;
bool is_hdb = false;
io_generic_read(io, h, 0, 0xa2);
// First byte is the disk format:
switch (h[0])
{
case 0x01:
default:
//01h: 2HD-8 sector (1.25MB) (BKDSK .HDM) (aka 2HS)
//2 sides, 77 tracks, 8 sectors/track, 1024 bytes/sector = 1261568 bytes (360rpm)
heads = 2;
tracks = 77;
spt = 8;
bps = 1024;
break;
case 0x02:
//02H: 2HD-15 sector (1.21MB) (BKDSK .HD5) (aka 2HC)
//2 sides, 80 tracks, 15 sectors/track, 512 bytes/sector = 1228800 bytes (360rpm)
heads = 2;
tracks = 80;
spt = 15;
bps = 512;
break;
case 0x03:
//03H: 2HQ-18 sector (1.44MB) (BKDSK .HD4) (aka 2HDE)
//2 sides, 80 tracks, 18 sectors/track, 512 bytes/sector = 1474560 bytes (300rpm)
heads = 2;
tracks = 80;
spt = 18;
bps = 512;
break;
case 0x04:
//04H: 2DD-8 sector (640KB) (BKDSK .DD6)
//2 sides, 80 tracks, 8 sectors/track, 512 bytes/sector = 655360 bytes (300rpm)
heads = 2;
tracks = 80;
spt = 8;
bps = 512;
break;
case 0x05:
//05h: 2DD-9 sector ( 720KB) (BKDSK .DD9)
//2 sides, 80 tracks, 9 sectors/track, 512 bytes/sector = 737280 bytes (300rpm)
heads = 2;
tracks = 80;
spt = 9;
bps = 512;
break;
case 0x08:
//08h: 2HD-9 sector (1.44MB)
//2 sides, 80 tracks, 9 sectors/track, 1024 bytes/sector = 1474560 bytes (300rpm)(??)
heads = 2;
tracks = 80;
spt = 9;
bps = 1024;
break;
case 0x11:
//11h: BASIC-2HD (BKDSK .HDB)
//Head 0 Track 0 - FM encoding - 26 sectors of 128 bytes = 1 track
//Head 1 Track 0 - MFM encoding - 26 sectors of 256 bytes = 1 track
//Head 0 Track 1 to Head 1 Track 77 - 26 sectors of 256 bytes = 152 tracks
//2 sides, 77 tracks, 26 sectors/track, 256 bytes/sector (except for head 0 track 0) = 1021696 bytes (360rpm)
is_hdb = true;
heads = 2;
tracks = 77;
spt = 26;
bps = 256;
break;
case 0x19:
//19h: BASIC 2DD (BKDSK .DDB)
//2 sides, 80 tracks, 16 sectors/track, 256 bytes/sector = 655360 bytes (300rpm)
heads = 2;
tracks = 80;
spt = 16;
bps = 256;
break;
case 0x21:
//21H: 2HD-26 sector
//2 sides, 80 tracks, 26 sectors/track, 256 bytes/sector = 1064960 bytes (??rpm)(??)
heads = 2;
tracks = 80;
spt = 26;
bps = 256;
break;
}
int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
int ssize;
for (ssize = 0; (128 << ssize) < bps; ssize++);
desc_pc_sector sects[256];
UINT8 sect_data[65536];
if (!is_hdb)
{
for (int track = 0; track < tracks; track++)
for (int head = 0; head < heads; head++)
{
io_generic_read(io, sect_data, 0xa2 + bps * spt * (track * heads + head), bps * spt);
for (int i = 0; i < spt; i++)
{
sects[i].track = track;
sects[i].head = head;
sects[i].sector = i + 1;
sects[i].size = ssize;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * bps;
}
build_pc_track_mfm(track, head, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, bps));
}
}
else // FIXME: the code below is untested, because no image was found... there might be some silly mistake in the disk geometry!
{
// Read Head 0 Track 0 is FM with 26 sectors of 128bytes instead of 256
io_generic_read(io, sect_data, 0xa2, 128 * spt);
for (int i = 0; i < spt; i++)
{
sects[i].track = 0;
sects[i].head = 0;
sects[i].sector = i + 1;
sects[i].size = 0;
sects[i].actual_size = 128;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * 128;
}
build_pc_track_fm(0, 0, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, 128));
// Read Head 1 Track 0 is MFM with 26 sectors of 256bytes
io_generic_read(io, sect_data, 0xa2 + 128 * spt, bps * spt);
for (int i = 0; i < spt; i++)
{
sects[i].track = 0;
sects[i].head = 1;
sects[i].sector = i + 1;
sects[i].size = ssize;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * bps;
}
build_pc_track_mfm(0, 1, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, bps));
// Read other tracks as usual
UINT32 data_offs = 0xa2 + (26 * 0x80) + (26 * 0x100);
for (int track = 1; track < tracks; track++)
for (int head = 0; head < heads; head++)
{
io_generic_read(io, sect_data, data_offs + bps * spt * ((track - 1) * heads + head), bps * spt);
for (int i = 0; i < spt; i++)
{
sects[i].track = track;
sects[i].head = head;
sects[i].sector = i + 1;
sects[i].size = ssize;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * bps;
}
build_pc_track_mfm(track, head, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, bps));
}
}
return true;
}
bool nfd_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
uint64_t size = io_generic_size(io);
uint8_t h[0x120], hsec[0x10];
io_generic_read(io, h, 0, 0x120);
int format_version = !strncmp((const char *)h, "T98FDDIMAGE.R0", 14) ? 0 : 1;
// sector map (the 164th entry is only used by rev.1 format, loops with track < 163 are correct for rev.0)
uint8_t disk_type = 0;
uint8_t num_secs[164];
uint8_t num_specials[164];
uint32_t track_sizes[164];
uint8_t tracks[164 * 26];
uint8_t heads[164 * 26];
uint8_t secs[164 * 26];
uint8_t mfm[164 * 26];
uint8_t sec_sizes[164 * 26];
uint32_t hsize = little_endianize_int32(*(uint32_t *)(h+0x110));
int pos = 0x120;
// set up sector map
if (format_version == 1)
{
for (int track = 0; track < 164; track++)
{
int curr_track_size = 0;
// read sector map absolute location
io_generic_read(io, hsec, pos, 4);
pos += 4;
uint32_t secmap_addr = little_endianize_int32(*(uint32_t *)(hsec));
if (secmap_addr)
{
// read actual sector map for the sectors of this track
// for rev.1 format the first 0x10 are a track summary:
// first WORD is # of sectors, second WORD is # of special data sectors
io_generic_read(io, hsec, secmap_addr, 0x10);
secmap_addr += 0x10;
num_secs[track] = little_endianize_int16(*(uint16_t *)(hsec));
num_specials[track] = little_endianize_int16(*(uint16_t *)(hsec + 0x2));
for (int sect = 0; sect < num_secs[track]; sect++)
{
io_generic_read(io, hsec, secmap_addr, 0x10);
if (track == 0 && sect == 0)
disk_type = hsec[0xb]; // can this change across the disk? I don't think so...
secmap_addr += 0x10;
tracks[(track * 26) + sect] = hsec[0];
heads[(track * 26) + sect] = hsec[1];
secs[(track * 26) + sect] = hsec[2];
sec_sizes[(track * 26) + sect] = hsec[3];
mfm[(track * 26) + sect] = hsec[4];
curr_track_size += (128 << hsec[3]);
}
if (num_specials[track] > 0)
{
for (int sect = 0; sect < num_specials[track]; sect++)
{
io_generic_read(io, hsec, secmap_addr, 0x10);
secmap_addr += 0x10;
curr_track_size += (hsec[9] + 1) * little_endianize_int32(*(uint32_t *)(hsec + 0x0a));
}
}
}
else
{
num_secs[track] = 0;
num_specials[track] = 0;
}
track_sizes[track] = curr_track_size;
}
}
else
{
for (int track = 0; track < 163 && pos < hsize; track++)
{
int curr_num_sec = 0, curr_track_size = 0;
for (int sect = 0; sect < 26; sect++)
{
// read sector map for this sector
// for rev.0 format each sector uses 0x10 bytes
io_generic_read(io, hsec, pos, 0x10);
if (track == 0 && sect == 0)
disk_type = hsec[0xa]; // can this change across the disk? I don't think so...
pos += 0x10;
if (hsec[0] == 0xff) // unformatted/unused sector
continue;
tracks[(track * 26) + sect] = hsec[0];
heads[(track * 26) + sect] = hsec[1];
secs[(track * 26) + sect] = hsec[2];
sec_sizes[(track * 26) + sect] = hsec[3];
mfm[(track * 26) + sect] = hsec[4];
curr_track_size += (128 << hsec[3]);
curr_num_sec++;
}
num_secs[track] = curr_num_sec;
track_sizes[track] = curr_track_size;
}
}
// shouln't this be set-up depending on disk_type? gaplus does not like having less than 166666 cells
int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
switch (disk_type)
{
case 0x10: // 640K disk, 2DD
image->set_variant(floppy_image::DSDD);
break;
//case 0x30: // 1.44M disk, ?? (no images found)
// break;
case 0x90: // 1.2M disk, 2HD
default:
image->set_variant(floppy_image::DSHD);
break;
}
desc_pc_sector sects[256];
uint8_t sect_data[65536];
int cur_sec_map = 0, sector_size;
pos = hsize;
for (int track = 0; track < 163 && pos < size; track++)
{
io_generic_read(io, sect_data, pos, track_sizes[track]);
for (int i = 0; i < num_secs[track]; i++)
{
cur_sec_map = track * 26 + i;
sector_size = 128 << sec_sizes[cur_sec_map];
sects[i].track = tracks[cur_sec_map];
sects[i].head = heads[cur_sec_map];
sects[i].sector = secs[cur_sec_map];
sects[i].size = sec_sizes[cur_sec_map];
sects[i].actual_size = sector_size;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * sector_size;
}
pos += track_sizes[track];
// notice that the operation below might fail if sectors of the same track have variable sec_sizes,
// because the gap3 calculation would account correctly only for the first sector...
// examined images had constant sec_sizes in the each track, so probably this is not an issue
if (mfm[track * 26])
build_pc_track_mfm(track / 2, track % 2, image, cell_count, num_secs[track], sects, calc_default_pc_gap3_size(form_factor, (128 << sec_sizes[track * 26])));
else
build_pc_track_fm(track / 2, track % 2, image, cell_count, num_secs[track], sects, calc_default_pc_gap3_size(form_factor, (128 << sec_sizes[track * 26])));
}
return true;
}
