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A number of IMD floppy image format handler fixes and it now does a sanity check on the sector type as well to detect malformed HxC IMD images with data errored sectors containing a variable number of bytes (against the specification).

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This commit is contained in:
OBattler
2020-08-19 01:38:34 +02:00
parent 6e5c040608
commit 37a4d26817
1 changed files with 55 additions and 20 deletions
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75
src/floppy/fdd_imd.c
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@@ -328,12 +328,15 @@ imd_seek(int drive, int track)
d86f_destroy_linked_lists(drive, 0);
d86f_destroy_linked_lists(drive, 1);
if (track > dev->track_count) {
d86f_zero_track(drive);
d86f_zero_track(drive);
if (track > dev->track_count)
return;
}
for (side = 0; side < dev->sides; side++) {
if (!dev->tracks[track][side].is_present)
continue;
track_rate = dev->current_side_flags[side] & 7;
if (!track_rate && (dev->current_side_flags[side] & 0x20))
track_rate = 4;
@@ -414,11 +417,11 @@ imd_seek(int drive, int track)
data = dev->track_buffer[side] + track_buf_pos[side];
type = dev->buffer[dev->tracks[track][side].sector_data_offs[ordered_pos]];
type = (type >> 1) & 7;
type = ((type - 1) >> 1) & 7;
flags = 0x00;
if ((type == 2) || (type == 4))
if (type & 0x01)
flags |= SECTOR_DELETED_DATA;
if ((type == 3) || (type == 4))
if (type & 0x02)
flags |= SECTOR_CRC_ERROR;
if (((flags & 0x02) || (id[3] > dev->tracks[track][side].max_sector_size)) && !fdd_get_turbo(drive))
@@ -717,6 +720,7 @@ imd_load(int drive, wchar_t *fn)
track_spt = buffer2[3];
sector_size = buffer2[4];
pclog("%02X %02X %02X %02X\n", buffer2[1], buffer2[2], buffer2[3], buffer2[4]);
if ((track_spt == 15) && (sector_size == 2))
dev->tracks[track][side].side_flags |= 0x20;
if ((track_spt == 16) && (sector_size == 2))
@@ -750,7 +754,12 @@ imd_load(int drive, wchar_t *fn)
last_offset += track_spt;
}
if (sector_size == 0xFF) {
if (track_spt == 0x00) {
dev->tracks[track][side].n_map_offs = last_offset;
buffer2 = buffer + last_offset;
last_offset += track_spt;
dev->tracks[track][side].is_present = 0;
} else if (sector_size == 0xFF) {
dev->tracks[track][side].n_map_offs = last_offset;
buffer2 = buffer + last_offset;
last_offset += track_spt;
@@ -762,17 +771,29 @@ imd_load(int drive, wchar_t *fn)
data_size = 128 << data_size;
dev->tracks[track][side].sector_data_offs[i] = last_offset;
dev->tracks[track][side].sector_data_size[i] = 1;
if (dev->buffer[dev->tracks[track][side].sector_data_offs[i]] > 0x08) {
/* Invalid sector data type, possibly a malformed HxC IMG image (it outputs data errored
sectors with a variable amount of bytes, against the specification). */
imd_log("IMD: Invalid sector data type %02X\n", dev->buffer[dev->tracks[track][side].sector_data_offs[i]]);
fclose(dev->f);
free(dev);
imd[drive] = NULL;
memset(floppyfns[drive], 0, sizeof(floppyfns[drive]));
return;
}
if (buffer[dev->tracks[track][side].sector_data_offs[i]] != 0)
dev->tracks[track][side].sector_data_size[i] += (buffer[dev->tracks[track][side].sector_data_offs[i]] & 1) ? data_size : 1;
last_offset += dev->tracks[track][side].sector_data_size[i];
if (!(buffer[dev->tracks[track][side].sector_data_offs[i]] & 1))
fwriteprot[drive] = writeprot[drive] = 1;
type = dev->buffer[dev->tracks[track][side].sector_data_offs[i]];
type = (type >> 1) & 7;
if ((type == 3) || (type == 4) || (data_size > (128 << dev->tracks[track][side].max_sector_size)))
track_total += (pre_sector + 3);
else
track_total += (pre_sector + data_size + 2);
if (type != 0x00) {
type = ((type - 1) >> 1) & 7;
if (data_size > (128 << dev->tracks[track][side].max_sector_size))
track_total += (pre_sector + 3);
else
track_total += (pre_sector + data_size + 2);
}
}
} else {
dev->tracks[track][side].data_offs = last_offset;
@@ -782,19 +803,32 @@ imd_load(int drive, wchar_t *fn)
data_size = 128 << data_size;
dev->tracks[track][side].sector_data_offs[i] = last_offset;
dev->tracks[track][side].sector_data_size[i] = 1;
if (dev->buffer[dev->tracks[track][side].sector_data_offs[i]] > 0x08) {
/* Invalid sector data type, possibly a malformed HxC IMG image (it outputs data errored
sectors with a variable amount of bytes, against the specification). */
imd_log("IMD: Invalid sector data type %02X\n", dev->buffer[dev->tracks[track][side].sector_data_offs[i]]);
fclose(dev->f);
free(dev);
imd[drive] = NULL;
memset(floppyfns[drive], 0, sizeof(floppyfns[drive]));
return;
}
if (buffer[dev->tracks[track][side].sector_data_offs[i]] != 0)
dev->tracks[track][side].sector_data_size[i] += (buffer[dev->tracks[track][side].sector_data_offs[i]] & 1) ? data_size : 1;
last_offset += dev->tracks[track][side].sector_data_size[i];
if (!(buffer[dev->tracks[track][side].sector_data_offs[i]] & 1))
fwriteprot[drive] = writeprot[drive] = 1;
type = dev->buffer[dev->tracks[track][side].sector_data_offs[i]];
type = (type >> 1) & 7;
if ((type == 3) || (type == 4) || (sector_size > dev->tracks[track][side].max_sector_size))
track_total += (pre_sector + 3);
else
track_total += (pre_sector + data_size + 2);
if (type != 0x00) {
type = ((type - 1) >> 1) & 7;
if (data_size > (128 << dev->tracks[track][side].max_sector_size))
track_total += (pre_sector + 3);
else
track_total += (pre_sector + data_size + 2);
}
}
}
buffer2 = buffer + last_offset;
/* Leaving even GAP4: 80 : 40 */
@@ -810,7 +844,7 @@ imd_load(int drive, wchar_t *fn)
else
converted_rate = dev->tracks[track][side].side_flags & 0x03;
if (gap3_sizes[converted_rate][sector_size][track_spt] == 0x00) {
if ((track_spt != 0x00) && (gap3_sizes[converted_rate][sector_size][track_spt] == 0x00)) {
size_diff = raw_tsize - track_total;
gap_sum = minimum_gap3 + minimum_gap4;
if (size_diff < gap_sum) {
@@ -831,7 +865,7 @@ imd_load(int drive, wchar_t *fn)
}
dev->tracks[track][side].gap3_len = (size_diff - minimum_gap4) / track_spt;
} else if (gap3_sizes[converted_rate][sector_size][track_spt] != 0x00)
} else if ((track_spt == 0x00) || (gap3_sizes[converted_rate][sector_size][track_spt] != 0x00))
dev->tracks[track][side].gap3_len = gap3_sizes[converted_rate][sector_size][track_spt];
/* imd_log("GAP3 length for (%02i)(%01i): %i bytes\n", track, side, dev->tracks[track][side].gap3_len); */
@@ -839,7 +873,8 @@ imd_load(int drive, wchar_t *fn)
if (track > dev->track_count)
dev->track_count = track;
if (last_offset >= fsize) break;
if (last_offset >= fsize)
break;
}
/* If more than 43 tracks, then the tracks are thin (96 tpi). */