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

Lua BitOp is free software, released under the same license as Lua.

Change list for version 1.0.1:
- New bit.tohex function for portable conversion of results to
  hexadecimal strings. This was added because string.format("%x", x)
  fails for negative numbers on some platforms.
- Added missing LUA_LIB define.
- Self-tests checks for arithmetic right-shift semantics.

Here is a link to the project home page with full docs:

And a direct link to the download page:

- Supported functions: bit.tobit, bit.tohex, bit.bnot,, bit.bor,
  bit.bxor, bit.lshift, bit.rshift, bit.arshift, bit.rol, bit.ror, bit.bswap
- Consistent semantics across 16, 32 and 64 bit platforms.
- Supports different lua_Number types: either IEEE 754 doubles,
  int32_t or int64_t.
- Runs on Linux, *BSD, Mac OS X, Windows and probably anything else
  you can find.
- Simple installation on all systems. No bulky configure scripts.
- Internal self-test on startup to detect miscompiles.
  Includes a comprehensive test and benchmark suite.
- Compatible with the bitwise operations in the upcoming LuaJIT 2.x.
- It's as fast as you can get with the standard Lua/C API.