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Update B6-temp.md

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rusefillc 2022-09-06 17:36:26 -04:00 committed by GitHub
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@ -21,6 +21,21 @@ function xorChecksum(data, targetIndex)
return result return result
end end
function setBitRange(data, totalBitIndex, bitWidth, value)
local byteIndex = totalBitIndex >> 3
local bitInByteIndex = totalBitIndex - byteIndex * 8
if (bitInByteIndex + bitWidth > 8) then
bitsToHandleNow = 8 - bitInByteIndex
setBitRange(data, totalBitIndex + bitsToHandleNow, bitWidth - bitsToHandleNow, value >> bitsToHandleNow)
bitWidth = bitsToHandleNow
end
mask = (1 << bitWidth) - 1
data[1 + byteIndex] = data[1 + byteIndex] & (~(mask << bitInByteIndex))
maskedValue = value & mask
shiftedValue = maskedValue << bitInByteIndex
data[1 + byteIndex] = data[1 + byteIndex] | shiftedValue
end
function getBitRange(data, bitIndex, bitWidth) function getBitRange(data, bitIndex, bitWidth)
byteIndex = bitIndex >> 3 byteIndex = bitIndex >> 3
shift = bitIndex - byteIndex * 8 shift = bitIndex - byteIndex * 8