Name
    qqwry.lua - A Lua interface to famous IP <=> Location database qqwry.dat

Synopsis
    local qqwry = require("qqwry")

    local t = qqwry.query("8.8.8.8")
        -- t == {"美国", "加利福尼亚州山景市谷歌公司DNS服务器"}

    local v = qqwry.version()
        -- v == {"纯真网络", "2011年08月25日IP数据"}

Installation
    Put the qqwry.lua into any your Lua module search path

Note
    This implementation does not depend on any module other than standard Lua
    5.1 redistribution package provided, that means you can use it on the fly
    with a standard Lua 5.1 installation. 

    By using some third party modules, such as agentzh's lua-php-utils
    (https://github.com/agentzh/lua-php-utils), or LuaJIT's BitOp
    (http://bitop.luajit.org/), the performance of this module can be optimized
    much. Also, read qqwry.dat's data into memory entirely and avoid file 
    opeartions will give this program another pair of fatastic wings. :)

Author
    Lance Li <[email protected]>

Copyright & License
    This library is licenced under the BSD license.

    Copyright (C) 2011, Lance Li <[email protected]>.

    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

        * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

        * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
    TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.