Here is how it is handled in rtp, maybe it is good enough for other containers count: number of headers to be stored size(a): size in byte of a headers[b]: b'nth header Nutesque syntax count-1 v for (i=0; i<count-1; i++) size(headers[i]) v for (i=0; i<count; i++) headers[i] lu -- Luca Barbato Gentoo/linux Gentoo/PPC http://dev.gentoo.org/~lu_zero