Nomad XML-RPC Library
by Trystan Scott Lee

Please note that the Atheme team has modified the original code a little bit.

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The Nomad XML-RPC Library is a light weight, simple implentation of the XML-RPC
specification (http://www.xmlrpc.com/spec), allowing developers to write applications
that can process XML-RPC requests.

The lib does not provide you with a socket listener it is up to the developer to
handle the process of reading and writting to the sockets. 

Type
./configure
make
make sample

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xml_register_method : register a xml-rpc method and its function which will handle the
                      data that is processed.

xmlrpc_unregister_method : unregister a xml-rpc method, this will clean up the memory
                           used to register the method

xmlrpc_set_buffer : set the function to which the lib will pass its data when its done
                    formatting the answer

xmlrpc_set_options : Some options are define able for each method call these are
       XMLRPC_HTTP_HEADER : in the spec http headers are required, however many implementations
                            such as PHP do not send the http headers, use XMLRPC_ON, XMLRPC_OFF
                            to enable
       
       XMLRPC_ENCODE : the spec allows you to set the text encoding, note that the default
                       is off as defined by the spec
      
       XMLRPC_INTTAG : the xml tag for an integer data type is defined in two fashions <i4>
                       and <int>, this option allows you to send the one you want, by default
                       the lib sends <i4>, use XMLRPC_I4 for <i4> tags and XMLRPC_INT for <int>

xmlrpc_generic_error : if you need to generate an error responce due to invalid information
                       passed to your method you can call this function and it will generate
                       a valid "fault" responce

xmlrpc_process       : pass the received socket data to this function so that it can process the
                       data, and pass it to the method handler

xmlrpc_getlast_error : should the code error out it will set the error code you can check this
                       by calling on this function.

xmlrpc_send   : once your method call is done and you want to write data back to the client
                call on this function so that the formatting can be done.

xmlrpc_char_encode : encode the string to be xml compliant, the xml-rpc spec only states that
                     < and & need to converted but xml itself says anything else is invalid

xmlrpc_array : formats an <array> responce

xmlrpc_double : formats a <double> responce

xmlrpc_base64 : formats a <base64> encoded responce

xmlrpc_boolean : formats a <boolean> responce

xmlrpc_string  : formats a <string> responce

xmlrpc_integer : formats a <i4> responce

xmlrpc_time2date : formats a <dateTime.iso8601> responce

xmlrpc_struct_begin : formats a <struct> response

xmlrpc_struct_end : formats a </struct> response

xmlrpc_decode64 : decoded a base64 string

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TODO
1. xmlrpc_integer : to make sure it does not overflow
2. xmlrpc_integer : to ensure that we are passed digits
3. add struct class member
4. add more error codes

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Error Codes

-1 : xmlrpc_process() was passed a NULL buffer
-2 : xmlrpc_parse() returned NULL, likely not a XML document
-3 : xmlrpc_method() returned NULL, likely XML document did not contain <methodname>
-4 : findXMLRPCCommand() returned NULL, able to find the method
-6 : method has no registered function
-7 : function returned XMLRPC_STOP
-8 : xmlrpc_set_buffer() was passed a NULL variable