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executable file 57 lines (50 sloc) 1.58 KB
#!/usr/bin/env python3
# unscramble dsk into po
# Paul Hagstrom, Dec 2015
import sys
import getopt
def main(argv=None):
print("dsk2po - convert dsk files to po files")
try:
opts, args = getopt.getopt(sys.argv[1:], '')
except getopt.GetoptError as err:
print(str(err))
usage()
return 1
try:
dskfilename = args[0]
except:
print('You need to provide the name of a DSK file to begin.')
return 1
potracks = []
with open(dskfilename, mode="rb") as dskfile:
for track in range(35):
trackbuffer = dskfile.read(4096)
potracks.append(dsk2po(trackbuffer))
pofilename = dskfilename + '.po'
print('Writing po image to {}'.format(pofilename))
with open(pofilename, mode="wb") as pofile:
for potrack in potracks:
pofile.write(potrack)
return 1
# From Beneath Apple ProDOS, table 3.1
# block 000 physical 0, 2 DOS 0, E page 0, 1
# block 001 physical 4, 6 DOS D, C page 2, 3
# block 002 physical 8, A DOS B, A page 4, 5
# block 003 physical C, E DOS 9, 8 page 6, 7
# block 004 physical 1, 3 DOS 7, 6 page 8, 9
# block 005 physical 5, 7 DOS 5, 4 page a, b
# block 006 physical 9, B DOS 3, 2 page c, d
# block 007 physical D, F DOS 1, F page e, f
# dsk images are in DOS order, so I need to convert from
# DOS sectors into blocks. That is combine D and C into 2 and 3
block_map = [0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15]
def dsk2po(trackbuffer):
potrack = bytearray()
for chunk in range(16):
chunk_start = 256*block_map[chunk]
chunk_end = chunk_start + 256
potrack.extend(trackbuffer[chunk_start:chunk_end])
return potrack
if __name__ == "__main__":
sys.exit(main())