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cjameshuff/gist:1246142

Created September 27, 2011 20:29
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gistfile1.rb
def lpcrc(fw)
# fix CRC (thanks to Roel Verdult for the lpcrc utility this is based on)
blocks = fw.unpack('V7') # read 7 little endian 32-bit integers
crc = (~(blocks.inject(0) {|crc, block| (crc + block) & 0xFFFFFFFF}) + 1) & 0xFFFFFFFF
fw[7*4, 4] = [crc].pack('V')
fw
end
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