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