mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-04 12:40:23 -08:00
72 lines
2.5 KiB
Plaintext
72 lines
2.5 KiB
Plaintext
bitlib
|
|
------
|
|
|
|
by Reuben Thomas <rrt@sc3d.org>
|
|
http://luaforge.net/projects/bitlib
|
|
|
|
|
|
bitlib is a C library for Lua 5.1 that provides bitwise operations. It
|
|
is copyright Reuben Thomas 2000-2009, and is released under the MIT
|
|
license, like Lua (see http://www.lua.org/copyright.html; it's
|
|
basically the same as the BSD license). There is no warranty.
|
|
|
|
Please report bugs and make suggestions to the email address above, or
|
|
use the LuaForge trackers.
|
|
|
|
Thanks to John Passaniti for his bitwise operations library, some of
|
|
whose ideas I used, to Shmuel Zeigerman for the test suite, to
|
|
Thatcher Ulrich for portability fixes, and to Enrico Tassi, John
|
|
Stiles and Eduardo Ochs for bug reports.
|
|
|
|
|
|
Installation
|
|
------------
|
|
|
|
As normal:
|
|
|
|
./configure && make [&& make check] [&& make install]
|
|
|
|
If you get warnings about integer constants being too large, don't
|
|
worry. They won't be used.
|
|
|
|
The following options may be of interest if you have Lua installed on
|
|
non-default paths (as you are likely to on any system supporting more
|
|
than one version of Lua):
|
|
|
|
--libdir=DIR Install shared library in this directory
|
|
--with-lua-prefix=DIR Lua files are in DIR
|
|
--with-lua-includes=DIR Lua include files are in DIR
|
|
--with-lua-libraries=DIR
|
|
Lua library files are in DIR, or "no" if not used
|
|
--with-lua-suffix=ARG Lua binary and library files are suffixed with ARG
|
|
|
|
For example, on Debian or Ubuntu:
|
|
|
|
./configure --libdir=/usr/local/lib/lua/5.1 --with-lua-includes=/usr/include/lua5.1 --with-lua-suffix=5.1 --with-lua-libraries=no
|
|
|
|
|
|
Use
|
|
---
|
|
|
|
Make sure the library is installed on your LUA_CPATH, and require it.
|
|
|
|
The library provides the constant bit.bits that gives the number of
|
|
bits that can be used in bitwise operations, and the following
|
|
functions:
|
|
|
|
bit.cast(a) cast a to the internally-used integer type
|
|
bit.bnot(a) returns the one's complement of a
|
|
bit.band(w1, ...) returns the bitwise and of the w's
|
|
bit.bor(w1, ...) returns the bitwise or of the w's
|
|
bit.bxor(w1, ...) returns the bitwise exclusive or of the w's
|
|
bit.lshift(a, b) returns a shifted left b places
|
|
bit.rshift(a, b) returns a shifted logically right b places
|
|
bit.arshift(a, b) returns a shifted arithmetically right b places
|
|
|
|
All function arguments should be integers that fit into the C type
|
|
lua_Integer.
|
|
|
|
The logical operations start with "b" for "bit" to avoid clashing with
|
|
reserved words; although "xor" isn't a reserved word, it seemed better
|
|
to use "bxor" for consistency.
|