Apple-2-Tools/pyapple2disk
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Add some VTOC anomalies

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This commit is contained in:
kris 2017-04-20 23:21:01 +01:00
parent f3bde766bf
commit 6ca343400e
1 changed files with 41 additions and 2 deletions
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43
src/apple2disk/dos33disk.py
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@ -40,9 +40,29 @@ class VTOCSector(disklib.Sector):
assert bytes_per_sector == disklib.SECTOR_SIZE
assert sectors_per_track == disklib.SECTORS_PER_TRACK
# Max number of track/sector pairs which will fit in one file track/sector
# list sector (122 for 256 byte sectors)
assert max_track_sector_pairs == 122
if tracks_per_disk != disklib.TRACKS_PER_DISK:
self.anomalies.append(
anomaly.Anomaly(
self, anomaly.INTERESTING, 'Disk has %d tracks > %d' % (
tracks_per_disk, disklib.TRACKS_PER_DISK)
)
)
self.catalog_track = catalog_track
self.catalog_sector = catalog_sector
if (catalog_track, catalog_sector) != (0x11, 0x0f):
self.anomalies.append(
anomaly.Anomaly(
self, anomaly.INTERESTING, 'Catalog begins in unusual place: T$%02X S$%02X' % (
catalog_track, catalog_sector)
)
)
# TODO: why does DOS 3.3 sometimes display e.g. volume 254 when the VTOC says 178
self.volume = volume
@ -53,12 +73,33 @@ class VTOCSector(disklib.Sector):
track_freemap = freemap[offset:offset+32]
# Each track freemap is a 32-bit sequence where the sector order is
# FEDCBA9876543210................
for sector in xrange(disklib.SECTORS_PER_TRACK):
free = track_freemap[15-sector]
if free:
if track == 0:
self.anomalies.append(
anomaly.Anomaly(
self, anomaly.CORRUPTION,
'Freemap claims free sector in track 0: T$%02X S$%02X (cannot be allocated in DOS ' +
'3.3)' % (track, sector)
)
)
continue
if track >= tracks_per_disk:
self.anomalies.append(
anomaly.Anomaly(
self, anomaly.CORRUPTION,
'Freemap claims free sector beyond last track: T$%02X S$%02X' % (track, sector)
)
)
continue
old_sector = self.disk.ReadSector(track, sector)
# check first this is an unclaimed sector
# TODO: we haven't yet parsed the catalog so this won't yet have claimed the sectors. We
# need to validate the freemap once everything else is done.
if type(old_sector) != disklib.Sector:
self.anomalies.append(
anomaly.Anomaly(
@ -69,8 +110,6 @@ class VTOCSector(disklib.Sector):
FreeSector.fromSector(old_sector)
# TODO: also handle sectors that are claimed to be used but don't end up getting referenced by anything
if track == tracks_per_disk:
break
track += 1
offset += 32