def buildDevice(deltas):
"""{8:+1, 10:-3, ...} --> otTables.Device"""
if not deltas:
return None
self = ot.Device()
keys = deltas.keys()
self.StartSize = startSize = min(keys)
self.EndSize = endSize = max(keys)
assert 0 <= startSize <= endSize
self.DeltaValue = deltaValues = [
deltas.get(size, 0) for size in range(startSize, endSize + 1)
]
maxDelta = max(deltaValues)
minDelta = min(deltaValues)
assert minDelta > -129 and maxDelta < 128
if minDelta > -3 and maxDelta < 2:
self.DeltaFormat = 1
elif minDelta > -9 and maxDelta < 8:
self.DeltaFormat = 2
else:
self.DeltaFormat = 3
return self
def buildVarDevTable(varIdx):
self = ot.Device()
self.DeltaFormat = 0x8000
self.StartSize = varIdx >> 16
self.EndSize = varIdx & 0xFFFF
return self
