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Diffstat (limited to 'src/lib/formats/g64_dsk.c')
-rw-r--r--src/lib/formats/g64_dsk.c113
1 files changed, 65 insertions, 48 deletions
diff --git a/src/lib/formats/g64_dsk.c b/src/lib/formats/g64_dsk.c
index b4b9f057f1b..6cbb345adc8 100644
--- a/src/lib/formats/g64_dsk.c
+++ b/src/lib/formats/g64_dsk.c
@@ -44,37 +44,47 @@ bool g64_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
dynamic_buffer img(size);
io_generic_read(io, &img[0], 0, size);
- if (img[VERSION]) {
- throw emu_fatalerror("g64_format: Unsupported version %u", img[VERSION]);
+ if (img[POS_VERSION]) {
+ throw emu_fatalerror("g64_format: Unsupported version %u", img[POS_VERSION]);
}
- int track_count = img[TRACK_COUNT];
+ int track_count = img[POS_TRACK_COUNT];
int head = 0;
for (int track = 0; track < track_count; track++)
{
- UINT32 track_offset = pick_integer_le(&img[0], TRACK_OFFSET + (track * 4), 4);
+ int cylinder = track % TRACK_COUNT;
- if (!track_offset)
+ if (track == TRACK_COUNT)
+ head = 1;
+
+ UINT32 tpos = POS_TRACK_OFFSET + (track * 4);
+ UINT32 spos = tpos + (track_count * 4);
+ UINT32 dpos = pick_integer_le(&img[0], tpos, 4);
+
+ if (!dpos)
continue;
- if (track_offset > size)
- throw emu_fatalerror("g64_format: Track %u offset %06x out of bounds", track, track_offset);
+ if (dpos > size)
+ throw emu_fatalerror("g64_format: Track %u offset %06x out of bounds", track, dpos);
- UINT32 speed_zone = pick_integer_le(&img[0], SPEED_ZONE + (track * 4), 4);
+ UINT32 speed_zone = pick_integer_le(&img[0], spos, 4);
if (speed_zone > 3)
throw emu_fatalerror("g64_format: Unsupported variable speed zones on track %d", track);
- UINT16 track_bytes = pick_integer_le(&img[0], track_offset, 2);
+ UINT16 track_bytes = pick_integer_le(&img[0], dpos, 2);
int track_size = track_bytes * 8;
- LOG_FORMATS("track %u size %u cell %ld\n", track, track_size, 200000000L/track_size);
+ LOG_FORMATS("head %u track %u offs %u size %u cell %ld\n", head, cylinder, dpos, track_bytes, 200000000L/track_size);
- generate_track_from_bitstream(track, head, &img[track_offset+2], track_size, image);
+ generate_track_from_bitstream(cylinder, head, &img[dpos+2], track_size, image);
}
- image->set_variant(floppy_image::SSSD);
+ if (!head)
+ image->set_variant(floppy_image::SSSD);
+ else
+ image->set_variant(floppy_image::DSSD);
return true;
}
@@ -93,52 +103,59 @@ int g64_format::generate_bitstream(int track, int head, int speed_zone, UINT8 *t
bool g64_format::save(io_generic *io, floppy_image *image)
{
- UINT8 header[] = { 'G', 'C', 'R', '-', '1', '5', '4', '1', 0x00, 0x54, TRACK_LENGTH & 0xff, TRACK_LENGTH >> 8 };
+ int tracks, heads;
+ image->get_actual_geometry(tracks, heads);
+ tracks = TRACK_COUNT * heads;
- io_generic_write(io, header, SIGNATURE, sizeof(header));
+ // write header
+ UINT8 header[] = { 'G', 'C', 'R', '-', '1', '5', '4', '1', 0x00, tracks, TRACK_LENGTH & 0xff, TRACK_LENGTH >> 8 };
+ io_generic_write(io, header, POS_SIGNATURE, sizeof(header));
- int head = 0;
- int tracks_written = 0;
+ // write tracks
+ for (int head = 0; head < heads; head++) {
+ int tracks_written = 0;
- dynamic_buffer trackbuf(TRACK_LENGTH-2);
- for (int track = 0; track < 84; track++) {
- UINT32 tpos = TRACK_OFFSET + track * 4;
- UINT32 spos = SPEED_ZONE + track * 4;
- UINT32 dpos = TRACK_DATA + tracks_written * TRACK_LENGTH;
+ dynamic_buffer trackbuf(TRACK_LENGTH-2);
- io_generic_write_filler(io, 0x00, tpos, 4);
- io_generic_write_filler(io, 0x00, spos, 4);
+ for (int track = 0; track < TRACK_COUNT; track++) {
+ UINT32 tpos = POS_TRACK_OFFSET + (track * 4);
+ UINT32 spos = tpos + (tracks * 4);
+ UINT32 dpos = POS_TRACK_OFFSET + (tracks * 4 * 2) + (tracks_written * TRACK_LENGTH);
- if (image->get_buffer(track, head).size() <= 1)
- continue;
+ io_generic_write_filler(io, 0x00, tpos, 4);
+ io_generic_write_filler(io, 0x00, spos, 4);
+
+ if (image->get_buffer(track, head).size() <= 1)
+ continue;
- int track_size;
- int speed_zone;
+ int track_size;
+ int speed_zone;
- // figure out the cell size and speed zone from the track data
- if ((speed_zone = generate_bitstream(track, head, 3, &trackbuf[0], track_size, image)) == -1)
- if ((speed_zone = generate_bitstream(track, head, 2, &trackbuf[0], track_size, image)) == -1)
- if ((speed_zone = generate_bitstream(track, head, 1, &trackbuf[0], track_size, image)) == -1)
- if ((speed_zone = generate_bitstream(track, head, 0, &trackbuf[0], track_size, image)) == -1)
- throw emu_fatalerror("g64_format: Cannot determine speed zone for track %u", track);
+ // figure out the cell size and speed zone from the track data
+ if ((speed_zone = generate_bitstream(track, head, 3, &trackbuf[0], track_size, image)) == -1)
+ if ((speed_zone = generate_bitstream(track, head, 2, &trackbuf[0], track_size, image)) == -1)
+ if ((speed_zone = generate_bitstream(track, head, 1, &trackbuf[0], track_size, image)) == -1)
+ if ((speed_zone = generate_bitstream(track, head, 0, &trackbuf[0], track_size, image)) == -1)
+ throw emu_fatalerror("g64_format: Cannot determine speed zone for track %u", track);
- LOG_FORMATS("track %u size %u cell %u\n", track, track_size, c1541_cell_size[speed_zone]);
+ LOG_FORMATS("head %u track %u size %u cell %u\n", head, track, track_size, c1541_cell_size[speed_zone]);
- UINT8 track_offset[4];
- UINT8 speed_offset[4];
- UINT8 track_length[2];
+ UINT8 track_offset[4];
+ UINT8 speed_offset[4];
+ UINT8 track_length[2];
- place_integer_le(track_offset, 0, 4, dpos);
- place_integer_le(speed_offset, 0, 4, speed_zone);
- place_integer_le(track_length, 0, 2, track_size/8);
+ place_integer_le(track_offset, 0, 4, dpos);
+ place_integer_le(speed_offset, 0, 4, speed_zone);
+ place_integer_le(track_length, 0, 2, track_size/8);
- io_generic_write(io, track_offset, tpos, 4);
- io_generic_write(io, speed_offset, spos, 4);
- io_generic_write_filler(io, 0xff, dpos, TRACK_LENGTH);
- io_generic_write(io, track_length, dpos, 2);
- io_generic_write(io, &trackbuf[0], dpos + 2, track_size);
+ io_generic_write(io, track_offset, tpos, 4);
+ io_generic_write(io, speed_offset, spos, 4);
+ io_generic_write_filler(io, 0xff, dpos, TRACK_LENGTH);
+ io_generic_write(io, track_length, dpos, 2);
+ io_generic_write(io, &trackbuf[0], dpos + 2, track_size);
- tracks_written++;
+ tracks_written++;
+ }
}
return true;
@@ -151,12 +168,12 @@ const char *g64_format::name() const
const char *g64_format::description() const
{
- return "Commodore 1541 GCR disk image";
+ return "Commodore 1541/1571 GCR disk image";
}
const char *g64_format::extensions() const
{
- return "g64,g41";
+ return "g64,g41,g71";
}
const floppy_format_type FLOPPY_G64_FORMAT = &floppy_image_format_creator<g64_format>;