bool wd177x_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
int type = find_size(io, form_factor);
if(type == -1)
return false;
const format &f = formats[type];
floppy_image_format_t::desc_e *desc;
int current_size;
int end_gap_index;
switch (f.encoding)
{
case floppy_image::FM:
desc = get_desc_fm(f, current_size, end_gap_index);
break;
case floppy_image::MFM:
default:
desc = get_desc_mfm(f, current_size, end_gap_index);
break;
}
int total_size = 200000000/f.cell_size;
int remaining_size = total_size - current_size;
if(remaining_size < 0)
throw emu_fatalerror("wd177x_format: Incorrect track layout, max_size=%d, current_size=%d", total_size, current_size);
// Fixup the end gap
desc[end_gap_index].p2 = remaining_size / 16;
desc[end_gap_index + 1].p2 = remaining_size & 15;
desc[end_gap_index + 1].p1 >>= 16-(remaining_size & 15);
int track_size = compute_track_size(f);
UINT8 sectdata[40*512];
desc_s sectors[40];
build_sector_description(f, sectdata, sectors);
for(int track=0; track < f.track_count; track++)
for(int head=0; head < f.head_count; head++) {
if (f.encoding == floppy_image::FM)
desc[14].p1 = get_track_dam_fm(f, head, track);
else
desc[16].p1 = get_track_dam_mfm(f, head, track);
io_generic_read(io, sectdata, get_image_offset(f, head, track), track_size);
generate_track(desc, track, head, sectors, f.sector_count, total_size, image);
}
image->set_variant(f.variant);
return true;
}
bool wd177x_format::save(io_generic *io, floppy_image *image)
{
// Count the number of formats
int formats_count;
for(formats_count=0; formats[formats_count].form_factor; formats_count++);
// Allocate the storage for the list of testable formats for a
// given cell size
dynamic_array<int> candidates(formats_count);
// Format we're finally choosing
int chosen_candidate = -1;
// Previously tested cell size
int min_cell_size = 0;
for(;;) {
// Build the list of all formats for the immediatly superior cell size
int cur_cell_size = 0;
int candidates_count = 0;
for(int i=0; i != formats_count; i++) {
if(image->get_form_factor() == floppy_image::FF_UNKNOWN ||
image->get_form_factor() == formats[i].form_factor) {
if(formats[i].cell_size == cur_cell_size)
candidates[candidates_count++] = i;
else if((!cur_cell_size || formats[i].cell_size < cur_cell_size) &&
formats[i].cell_size > min_cell_size) {
candidates[0] = i;
candidates_count = 1;
cur_cell_size = formats[i].cell_size;
}
}
}
min_cell_size = cur_cell_size;
// No candidates with a cell size bigger than the previously
// tested one, we're done
if(!candidates_count)
break;
// Filter with track 0 head 0
check_compatibility(image, candidates, candidates_count);
// Nobody matches, try with the next cell size
if(!candidates_count)
continue;
// We have a match at that cell size, we just need to find the
// best one given the geometry
// If there's only one, we're done
if(candidates_count == 1) {
chosen_candidate = candidates[0];
break;
}
// Otherwise, find the best
int tracks, heads;
image->get_actual_geometry(tracks, heads);
chosen_candidate = candidates[0];
for(int i=1; i != candidates_count; i++) {
const format &cc = formats[chosen_candidate];
const format &cn = formats[candidates[i]];
// Handling enough sides is better than not
if(cn.head_count >= heads && cc.head_count < heads)
goto change;
else if(cc.head_count >= heads && cn.head_count < heads)
goto dont_change;
// Since we're limited to two heads, at that point head
// count is identical for both formats.
// Handling enough tracks is better than not
if(cn.track_count >= tracks && cc.track_count < tracks)
goto change;
else if(cn.track_count >= tracks && cc.track_count < tracks)
goto dont_change;
// Both are on the same side of the track count, so closest is best
if(cc.track_count < tracks && cn.track_count > cc.track_count)
goto change;
if(cc.track_count >= tracks && cn.track_count < cc.track_count)
goto change;
goto dont_change;
change:
chosen_candidate = candidates[i];
dont_change:
;
}
// We have a winner, bail out
break;
}
// No match, pick the first one and be done with it
if(chosen_candidate == -1)
chosen_candidate = 0;
const format &f = formats[chosen_candidate];
int track_size = compute_track_size(f);
UINT8 sectdata[40*512];
desc_s sectors[40];
build_sector_description(f, sectdata, sectors);
for(int track=0; track < f.track_count; track++)
for(int head=0; head < f.head_count; head++) {
extract_sectors(image, f, sectors, track, head);
io_generic_write(io, sectdata, get_image_offset(f, head, track), track_size);
}
return true;
}
