extremlapin / luajit_bit_extended

Extending the LuaJIT BitOp lib

luajit_bit_extended

extending the luajit bit lib

• bit.MSB(int value)

  Returns the value with it's most significant bit only most-significant-bit only

   entry : 	424242 00000000 00000110 01111001 00110010
  
   exit:		262144 00000000 00000100 00000000 00000000
  

• bit.LSB(int value)

  Returns the value with it's most significant bit only least-significant-bit only

• bit.getPos(int value)

  Returns the position of the (only) bit of the number, mostly meant to be used with LSB and MSB, function itself used by bit.select

   entry : 128 00000000 00000000 00000000 10000000
   exit: 8
  

• bit.select(int value, mask)

  Similar to bit.band but also correctly right-shift it to get only the part we need. Example (Looks much better in the .lua comments because markdown formating sucks) :

   bit.select(133742101, 0xffffffff)
  
   entry : 	133742101 00000111 11111000 10111110 00010101
   
   exit: 		133742101 00000111 11111000 10111110 00010101
  

   bit.select(133742101, 0x00f0000)
  
   entry 133742101 : 	00000111 11111000 10111110 00010101
  
   mask =				00000000 00001111 00000000 00000000
  
   exit: 8		00001000
  

   bit.select(133742101, 0x0f0ff000)
  
   entry :	133742101 00000111 11111000 10111110 00010101
  
   mask = 	00001111 00001111 11110000 00000000
  
   exit: 28811 0111 00001000 10110000 00000000
  
   exit: 28811 01110000 10001011
  

• bit.split(int value)

  Turns the 32bit integer into a table (size = 32) of 1s and 0s

• bit.tostring(int value, bool bytes_separator)

  Returns a string (visual representation) of the integer.