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from rfc5052
------------
step one:
Input:
B -- Maximum Source Block Length, i.e., the maximum number of source
symbols per source block
L -- Transfer Length in octets
E -- Encoding Symbol Length in octets
Output:
T -- the number of source symbols in the object.
N -- the number of source blocks into which the object shall be
partitioned.
Algorithm:
1. The number of source symbols in the transport object is computed
as T = ceil[L/E].
2. The transport object shall be partitioned into N = ceil[T/B]
source blocks.
B = maximum TPDU - IP header ( - UDP header ) - PGM header
L = APDU length (pgm_transport_send length parameter).
E = 1 (fixed).
T = ceil( L / E ) = ceil( L / 1 ) = L
N = ceil( T / B ) = ceil( L / B )
step two:
Input:
T -- the number of source symbols in the object.
N -- the number of source blocks into which the object is
partitioned.
Output:
I -- the number of larger source blocks.
A_large -- the length of each of the larger source blocks in
symbols.
A_small -- the length of each of the smaller source blocks in
symbols.
Algorithm:
1. A_large = ceil[T/N]
2. A_small = floor[T/N]
3. I = T - A_small * N
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