void upd765_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head)
{
UINT8 bitstream[500000/8];
UINT8 sectdata[50000];
desc_xs sectors[256];
int track_size;
// Extract the sectors
generate_bitstream_from_track(track, head, f.cell_size, bitstream, track_size, image);
switch (f.encoding)
{
case floppy_image::FM:
extract_sectors_from_bitstream_fm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata));
break;
case floppy_image::MFM:
extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata));
break;
}
for(int i=0; i<f.sector_count; i++) {
desc_s &ds = sdesc[i];
desc_xs &xs = sectors[ds.sector_id];
if(!xs.data)
memset((void *)ds.data, 0, ds.size);
else if(xs.size < ds.size) {
memcpy((void *)ds.data, xs.data, xs.size);
memset((UINT8 *)ds.data + xs.size, 0, xs.size - ds.size);
} else
memcpy((void *)ds.data, xs.data, ds.size);
}
}
int g64_format::generate_bitstream(int track, int head, int speed_zone, UINT8 *trackbuf, int &track_size, floppy_image *image)
{
int cell_size = c1541_cell_size[speed_zone];
generate_bitstream_from_track(track, head, cell_size, trackbuf, track_size, image);
int actual_cell_size = 200000000L/track_size;
// allow a tolerance of +- 10 us (3990..4010 -> 4000)
return ((actual_cell_size >= cell_size-10) && (actual_cell_size <= cell_size+10)) ? speed_zone : -1;
}
void upd765_format::check_compatibility(floppy_image *image, int *candidates, int &candidates_count)
{
UINT8 bitstream[500000/8];
UINT8 sectdata[50000];
desc_xs sectors[256];
int track_size;
// Extract the sectors
generate_bitstream_from_track(0, 0, formats[candidates[0]].cell_size, bitstream, track_size, image);
switch (formats[candidates[0]].encoding)
{
case floppy_image::FM:
extract_sectors_from_bitstream_fm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata));
break;
case floppy_image::MFM:
extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sectdata, sizeof(sectdata));
break;
}
// Check compatibility with every candidate, copy in-place
int *ok_cands = candidates;
for(int i=0; i != candidates_count; i++) {
const format &f = formats[candidates[i]];
int ns = 0;
for(int j=0; j<256; j++)
if(sectors[j].data) {
int sid;
if(f.sector_base_id == -1) {
for(sid=0; sid < f.sector_count; sid++)
if(f.per_sector_id[sid] == j)
break;
} else
sid = j - f.sector_base_id;
if(sid < 0 || sid > f.sector_count)
goto fail;
if(f.sector_base_size) {
if(sectors[j].size != f.sector_base_size)
goto fail;
} else {
if(sectors[j].size != f.per_sector_size[sid])
goto fail;
}
ns++;
}
if(ns == f.sector_count)
*ok_cands++ = candidates[i];
fail:
;
}
candidates_count = ok_cands - candidates;
}
bool vdk_format::save(io_generic *io, floppy_image *image)
{
uint8_t bitstream[500000/8];
uint8_t sector_data[50000];
desc_xs sectors[256];
uint64_t file_offset = 0;
int track_count, head_count;
image->get_actual_geometry(track_count, head_count);
// write header
uint8_t header[12];
header[0] = 'd';
header[1] = 'k';
header[2] = sizeof(header) % 0x100;
header[3] = sizeof(header) / 0x100;
header[4] = 0x10;
header[5] = 0x10;
header[6] = 'M';
header[7] = 0x01;
header[8] = track_count;
header[9] = head_count;
header[10] = 0;
header[11] = 0;
io_generic_write(io, header, file_offset, sizeof(header));
file_offset += sizeof(header);
// write disk data
for (int track = 0; track < track_count; track++)
{
for (int head = 0; head < head_count; head++)
{
int track_size;
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 < SECTOR_COUNT; i++)
{
io_generic_write(io, sectors[FIRST_SECTOR_ID + i].data, file_offset, SECTOR_SIZE);
file_offset += SECTOR_SIZE;
}
}
}
return true;
}
bool mfm_format::save(io_generic *io, floppy_image *image)
{
// TODO: HD support
MFMIMG header;
int track_count, head_count;
image->get_actual_geometry(track_count, head_count);
memcpy(&header.headername, MFM_FORMAT_HEADER, 7);
header.number_of_track = track_count;
header.number_of_side = head_count;
header.floppyRPM = 0;
header.floppyBitRate = 250;
header.floppyiftype = 4;
header.mfmtracklistoffset = sizeof(MFMIMG);
io_generic_write(io, &header, 0, sizeof(MFMIMG));
int tpos = sizeof(MFMIMG);
int dpos = tpos + track_count*head_count*sizeof(MFMTRACKIMG);
UINT8 trackbuf[150000/8];
for(int track=0; track < track_count; track++) {
for(int side=0; side < head_count; side++) {
int track_size;
generate_bitstream_from_track(track, side, 2000, trackbuf, track_size, image);
track_size = (track_size+7)/8;
MFMTRACKIMG trackdesc;
trackdesc.track_number = track;
trackdesc.side_number = side;
trackdesc.mfmtracksize = track_size;
trackdesc.mfmtrackoffset = dpos;
io_generic_write(io, &trackdesc, tpos, sizeof(MFMTRACKIMG));
io_generic_write(io, trackbuf, dpos, track_size);
tpos += sizeof(MFMTRACKIMG);
dpos += track_size;
}
}
return true;
}
bool jvc_format::save(io_generic *io, floppy_image *image)
{
UINT8 bitstream[500000/8];
UINT8 sector_data[50000];
desc_xs sectors[256];
UINT64 file_offset = 0;
int track_count, head_count;
image->get_actual_geometry(track_count, head_count);
// we'll write a header if the disk is two-sided
if (head_count == 2)
{
UINT8 header[2];
header[0] = 18;
header[1] = 2;
io_generic_write(io, header, file_offset, sizeof(header));
file_offset += sizeof(header);
}
// write disk data
for (int track = 0; track < track_count; track++)
{
for (int head = 0; head < head_count; head++)
{
int track_size;
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 < 18; i++)
{
if (sectors[1 + i].size != 256)
emu_fatalerror("jvc_format: invalid sector size: %d\n", sectors[1 + i].size);
io_generic_write(io, sectors[1 + i].data, file_offset, sectors[1 + i].size);
file_offset += sectors[1 + i].size;
}
}
}
return true;
}
bool ti99_floppy_format::save(io_generic *io, floppy_image *image)
{
int act_track_size = 0;
UINT8 bitstream[500000/8];
UINT8 trackdata[9216]; // max size
int cellsizes[] = { 2000, 4000, 1000, 2000 };
// Do we use double-stepping?
// If our image was loaded into a 80-track drive, we will always write 80 tracks.
int maxtrack, maxheads;
image->get_maximal_geometry(maxtrack, maxheads);
if (maxtrack > 80) maxtrack = 80;
else
{
if (maxtrack > 35 && maxtrack < 80) maxtrack = 40;
else maxtrack = 35;
}
int attempt = 0;
int sector[36];
int maxsect = 18;
bool write = true;
// We expect a bitstream of length 50000 for FM and 100000 for MFM
for(int head=0; head < 2; head++)
{
int track = 0;
while (track < maxtrack)
{
int cell_size = cellsizes[attempt];
int encoding = get_encoding(cell_size);
int track_size = get_track_size(cell_size, 36); // max number of sectors
// Retrieve the cells from the flux sequence
generate_bitstream_from_track(track, head, cell_size, bitstream, act_track_size, image);
// Maybe the track has become longer due to moving splices
if (act_track_size > 200000000/cell_size) act_track_size = 200000000/cell_size;
int marks = decode_bitstream(bitstream, trackdata, sector, act_track_size, encoding, (encoding==floppy_image::FM)? 0xff:0x4e, track_size);
if (track==0)
{
if (head==0)
{
// Find the highest sector in the track
// This is only needed for the SDF format
int i=35;
while (i>=0 && sector[i]==-1) i--;
if (i>18) maxsect = 36;
else
{
if (i>16) maxsect = 18;
else
{
if (i>9) maxsect = 16;
else maxsect = 9;
}
}
if (TRACE) osd_printf_info("ti99_dsk: Sectors/track: %d\n", maxsect);
// We try different cell sizes until we find a fitting size.
// If this fails, we fall back to a size of 2000 ns
// The criterion for a successful decoding is that we find at least
// 6 ID or data address marks on the track. It is highly unlikely
// to find so many marks with a wrong cell size.
if (marks < 6 && attempt < 4)
{
if (TRACE) osd_printf_verbose("ti99_dsk: Decoding with cell size %d failed.\n", cell_size);
attempt++;
write = false;
}
else write = true;
}
else
{
if (marks < 6)
{
if (min_heads()==1)
{
if (TRACE) osd_printf_info("ti99_dsk: We don't have a second side and the format allows for single-sided recording.\n");
return true;
}
else
{
osd_printf_warning("ti99_dsk: No second side, but this format requires two-sided recording. Saving empty tracks.\n");
}
}
}
}
if (write)
{
if (TRACE)
{
if (head == 0 && track == 0)
{
if (marks >=6) { if (TRACE) osd_printf_info("ti99_dsk: Decoding with cell size %d successful.\n", cell_size); }
else osd_printf_info("ti99_dsk: No address marks found on track 0. Assuming MFM format.\n");
}
}
// Save to the file
write_track(io, trackdata, sector, track, head, maxsect, maxtrack, track_size);
track++;
}
}
}
return true;
}
