[Vm-dev] Primitive to crop a ByteArray?

Hi guys. I have the following scenario. I have a buffer (ByteArray) that I pass by FFI to a function of size N. This function puts data in the array and answers me the M number of bytes that it put. M <= N. Finally, I need to copy the array of size N to the accuare size M. To do that, I am using #copyFrom:to:. If the ByteArray is large (which could be the case), this function takes significant time because it needs to allocate space for the new large resulting array. So...is there a destructive primitive where I can "crop" the existing array, modify its size field and mark the remaining bytes as "free space for the heap".

Do we have a primitive for that?

Thanks,

-- Mariano http://marianopeck.wordpress.com