Re: Request for updated bit manipulation library

[Patrick Donnelly <batrick () batbytes com>]

Hi Mak,

On Tue, Dec 14, 2010 at 1:43 PM, Mak Kolybabi <mak () kolybabi com> wrote:
> I have a need for the ability to perform bitwise operations on 64-bit integers.

You can't do 64-bit integer bitwise manipulations in Lua using its
regular number type (double precision floating point). You can at best
do 52 bits.

> I have been struggling with strange behaviour with the current bit library when
> the numbers get too large. The website Nmap's bit library originally came from
> has a new version, and its changes mention that there were issues with shifting
> previously. Any chance someone would be kind enough to integrate the newer
> version of the library into Nmap?

I've recently thought about upgrading Nmap's bit library to Mike
Pall's BitOp library [1] that is generally considered the successor to
Reuben Thomas's bitlib (even the author recommends BitOp). Problem is,
Lua 5.2 (probably released in a couple weeks) will be adding a bit
library and I'm not sure if we want to bother upgrading to BitOp when
we'll probably end up switching to the one that comes with Lua.

-- 
- Patrick Donnelly
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