Overview
Lua BitOp is a C extension module for Lua 5.1 which adds bitwise operations on numbers.

Lua BitOp is Copyright © 2008-2009 Mike Pall. Lua BitOp is free software, released under the MIT/X license (same license as the Lua core).

Download
The source code for LuaBitOp can be downloaded from:
http://bitop.luajit.org/download.html

A compiled Windows binary is available as part of the Lua for Windows project:
http://code.google.com/p/luaforwindows/

A zip file containing the bit.dll on its own through the link below.

Installation
Here is how to make the LuaBitOp module available to your AutoPlay Media Studio 8.0 project:

1. Download the LuaBitOp.zip file and extract its contents to a temporary location.

2. Copy the bit.dll file to your project's Scripts folder.

3. Add the following require to your project, e.g. in Global Functions:
require("bit")

Usage
The LuaBitOp functions are documented here:
http://bitop.luajit.org/api.html

Examples

-- counts the number of primes up to some maximum number

-- set m to  any number larger than 2

local m = 100000;



-- make sure m is >= 2

if m < 2 then m = 2 end



local bit = require("bit")

local band, bxor = bit.band, bit.bxor

local rshift, rol = bit.rshift, bit.rol



local count = 0

local p = {}



for i=0,(m+31)/32 do p[i] = -1 end



for i=2,m do

  if band(rshift(p[rshift(i, 5)], i), 1) ~= 0 then

    count = count + 1

    for j=i+i,m,i do

      local jx = rshift(j, 5)

      p[jx] = band(p[jx], rol(-2, j))

    end

  end

end



Dialog.Message("Sieve of Eratosthenes", string.format("Found %d primes up to %dn", count, m));

License
Lua BitOp is Copyright © 2008-2009 Mike Pall. Lua BitOp is free software, released under the MIT/X license (same license as the Lua core).

http://www.opensource.org/licenses/mit-license.php