I wrote:
> such that I can't do any processing on the fly.  I preinitialize an array
> of bits to zero, then use a sequence like:
>       btfsc   inport,inbit
>       bsf     buffer+0,0
>       btfsc   inport,inbit
>       bsf     buffer+0,1
>       [...]

I should also point out that it is not necessary to preinitialize the array
if the input port bit is either the MSB or LSB of a port, and you don't
need to preserve the contents of W.  In the LSB case, I use:
        rrf     inport,w
        rrf     buffer+0
        rrf     inport,w
        rrf     buffer+0
        [...]

Cheers,
Eric