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25 lines
969 B
Python
25 lines
969 B
Python
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from passport.wozimage import DiskImage, Track, WozError, raise_if
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import bitarray
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class EDDReader(DiskImage):
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def __init__(self, filename=None, stream=None):
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DiskImage.__init__(self, filename, stream)
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with stream or open(filename, 'rb') as f:
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for i in range(137):
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raw_bytes = f.read(16384)
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raise_if(len(raw_bytes) != 16384, WozError, "Bad EDD file (did you image by quarter tracks?)")
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bits = bitarray.bitarray(endian="big")
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bits.frombytes(raw_bytes)
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self.tracks.append(Track(bits, 131072))
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def seek(self, track_num):
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if type(track_num) != float:
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track_num = float(track_num)
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if track_num < 0.0 or \
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track_num > 35.0 or \
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track_num.as_integer_ratio()[1] not in (1,2,4):
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raise WozError("Invalid track %s" % track_num)
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trk_id = int(track_num * 4)
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return self.tracks[trk_id]
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