HTTP_RAW_POST_DATA example

[eluser]ronnixw[/eluser]
Hello,

So - situation:
I need to handle input xml which in plain php is handled by HTTP_RAW_POST_DATA.
How to create it in codeigniter. I don't know method data will be sent - I need only to receive them.
will $HTTP_RAW_POST_DATA be containing in controller method?

sorry about my english , hope it is clear what I mean

best regards,
ronnixw