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pack/unpack pos to binary

From eeew, 10 Years ago, written in Lua, viewed 862 times.
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  1. function packpos(x, y, z)
  2.     x = 819200+math.floor(x*100) -- -8192 - 8192   3 byte
  3.     y = 819200+math.floor(y*100)
  4.     z = math.floor(1300*65535/(z+100)) -- -100 - 1200   2 byte
  5.     return string.byte(
  6.         x, BitExtract(x, 8, 8), BitExtract(x, 16, 8)
  7.         y, BitExtract(y, 8, 8), BitExtract(x, 16, 8),
  8.         z, BitExtract(z, 8, 8))
  9. end
  10.  
  11. function unpackpos(string, startindex)
  12.     local x1, x2, x3, y1, y2, y3, z1, z2 = string:byte(startindex, startindex + 7)
  13.     return  ((x1 + x2*256 + x3*65536) - 819200)/100,
  14.             ((y1 + y2*256 + y3*65536) - 819200)/100,
  15.             (z1 + z2*256)/65535*1300 - 100
  16. end
  17.  

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