Name
    iconv-nginx-module

Description
    This is a nginx module that uses libiconv to convert characters of
    different encoding. It brings the 'set_iconv' command to nginx.

    This module depends on the ngx_devel_kit(NDK) module.

Installation
        Get the nginx source code from nginx.org.
        Untar the source code and build nginx with this module.

            wget 'http://nginx.org/download/nginx-1.2.7.tar.gz'
            tar -xzvf nginx-1.2.7.tar.gz
            cd nginx-1.2.7/

            ./configure \
                    --add-module=/path/to/ngx_devel_kit \
                    --add-module=/path/to/iconv-nginx-module

            make -j2
            make install

Usage
        set_iconv <destination variable> <from variable> from=<from encoding> to=<to encoding>;
        iconv_buffer_size <size>;   #default iconv_buffer_size is ngx_pagesize
        iconv_filter from=<from encoding> to=<to encoding>;

    Here is a basic example:
        #nginx.conf
        location /foo {
            set $src '你好'; #in UTF-8
            set_iconv $dst $src from=utf8 to=gbk; #now $dst holds 你好 in GBK
        }

        #everything generated from /bar will be converted from utf8 to gbk
        location /bar {
            iconv_filter from=utf-8 to=gbk;
            iconv_buffer_size 1k;
            #content handler here
        }

Compatibility
    The following versions of Nginx should work with this module:

    *   1.2.x (last tested: 1.2.7)

    *   1.1.x (last tested: 1.1.5)

    *   1.0.x (last tested: 1.0.8)

    *   0.9.x (last tested: 0.9.4)

    *   0.8.x (last tested: 0.8.54)

    *   0.7.x (last tested: 0.7.68)

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

    Copyright (c) 2010-2013, Jiale "Calio" Zhi <vipcalio@gmail.com>.

    Copyright (c) 2010-2013, Yichun "agentzh" Zhang <agentzh@gmail.com>, CloudFlare Inc.

    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.

Changelog
    v0.02 add iconv_filter and iconv_buffer_size instruction

    v0.01 implement set_iconv instruction