How to control block size of input_filter data

[Hoang-Vu Dang]

Hi all,

When I write an input_filter, I notice that the data sent from client is 
not always available in one chunk if it's large.

In other words, The input_filter() function will be called multiple 
times per request. My question is how to have a control on this (for 
example the size of the chunk until it breaks in to two) ? what should 
we look into in order to check if the two filters are called from the 
same request.

Thanks, Vu