Ensure page-based xdr data to decode is aligned at current pointer position
unsigned int xdr_read_pages(struct xdr_stream * xdr, unsigned int len);
xdr
pointer to xdr_stream struct
len
number of bytes of page data
Moves data beyond the current pointer position from the XDR head[] buffer into the page list. Any data that lies beyond current position + “len” bytes is moved into the XDR tail[].
Returns the number of XDR encoded bytes now contained in the pages