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Compute AccurateRip v2 checksum instead of v1. #120

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Compute AccurateRip v2 checksum instead of v1. #120

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8 changes: 6 additions & 2 deletions morituri/common/checksum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -300,7 +300,9 @@ def do_checksum_buffer(self, buf, checksum):
# ... on 5th frame, only use last value
elif self._discFrameCounter == 5:
values = struct.unpack("<I", buf[-4:])
checksum += common.SAMPLES_PER_FRAME * 5 * values[0]
mvalue = common.SAMPLES_PER_FRAME * 5 * values[0]
(hi, lo) = divmod(mvalue, 2 ** 32)
checksum += lo + hi
checksum &= 0xFFFFFFFF
return checksum

Expand All @@ -314,7 +316,9 @@ def do_checksum_buffer(self, buf, checksum):
values = struct.unpack("<%dI" % (len(buf) / 4), buf)
for i, value in enumerate(values):
# self._bytes is updated after do_checksum_buffer
checksum += (self._bytes / 4 + i + 1) * value
mvalue = (self._bytes / 4 + i + 1) * value
(hi, lo) = divmod(mvalue, 2 ** 32)
checksum += lo + hi
checksum &= 0xFFFFFFFF
# offset = self._bytes / 4 + i + 1
# if offset % common.SAMPLES_PER_FRAME == 0:
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