MakeHFS: write to pre-existing partitioned disks

This commit is contained in:
Elliot Nunn 2022-09-01 20:21:23 +08:00
parent 8dd4181d36
commit 4f554286e6
1 changed files with 57 additions and 12 deletions

View File

@ -123,17 +123,62 @@ vol.name = args.name
if args.dir: vol.read_folder(args.dir, date=args.date, mpw_dates=args.mpw_dates)
with open(args.dest[0], 'ab+') as f:
if args.size is None: args.size = hack_file_size(f)
if args.size == 0: args.size = 800 * 1024
try:
f = open(args.dest[0], 'rb+')
existed = True
except FileNotFoundError:
f = open(args.dest[0], 'wb+')
existed = False
with open(args.dest[0], 'rb+') as f:
left, gap, right = vol.write(args.size, startapp=args.app, sparse=True)
if args.size is not None:
offset = 0
size = args.size
trunc = True
nameoffset = None
f.write(left)
f.seek(gap, 1)
problem = len(left) + gap - f.tell()
if problem > 0:
f.write(bytes(problem))
f.write(right)
f.truncate()
elif not existed: # make a tiny floppy
offset = 0
size = 800 * 1024
trunc = True
nameoffset = None
elif f.read(2) == b'ER': # is partitioned disk
blksize = int.from_bytes(f.read(2), byteorder='big')
f.seek(blksize + 4)
entrycnt = int.from_bytes(f.read(4), byteorder='big')
for i in range(entrycnt):
entryoffset = blksize * (i + 1)
f.seek(entryoffset + 48)
if f.read(10) == b'Apple_HFS\x00':
f.seek(entryoffset + 8)
offset = blksize * int.from_bytes(f.read(4), byteorder='big')
size = blksize * int.from_bytes(f.read(4), byteorder='big')
trunc = False
nameoffset = entryoffset + 16
break
else:
raise ValueError("No HFS partition in this map")
else: # is raw filesystem
offset = 0
size = hack_file_size(f)
trunc = False
left, gap, right = vol.write(size, startapp=args.app, sparse=True)
f.seek(offset)
f.write(left)
f.seek(gap, 1)
problem = len(left) + gap - f.tell()
if problem > 0:
f.write(bytes(problem))
f.write(right)
if nameoffset is not None:
f.seek(nameoffset)
f.write(args.name.encode('mac_roman').ljust(32, b'\x00'))
if trunc: f.truncate()