Need to convert C to PBP

I am trying to write some code in PBPpro from an example in C.
I have got so far but am not familiar with C.
They give the packet structure and an example, but I cannot decipher what the code is doing before retrieving a value from a lookup table, and hopefully someone will be able to assist me here.

Any help greatly appreciated.

By the way, attachment is copyright Atomos Pty, Australia.

Code:

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CHKSUM                VAR LONG
VALUE                VAR LONG
COMMAND                VAR WORD
SIZE                        VAR WORD
TEMP_W                VAR WORD
TEMP_B                VAR BYTE
BUFFER                VAR BYTE [21]

SEND:                SIZE = $14
                        COMMAND = 0
                        VALUE = 1
                       
                        BUFFER [1] = SIZE.BYTE1
                        BUFFER [2] = SIZE.BYTE0
                        BUFFER [3] = COMMAND.BYTE1
                        BUFFER [4] = COMMAND.BYTE0
                        BUFFER [5] = $FF
                        BUFFER [6] = $FF
                        BUFFER [7] = $FF
                        BUFFER [8] = $FF
                        BUFFER [9] = $FF
                        BUFFER [10] = $FF
                        BUFFER [11] = $FF
                        BUFFER [12] = $FF
                        BUFFER [13] = VALUE.BYTE3
                        BUFFER [14] = VALUE.BYTE2
                        BUFFER [15] = VALUE.BYTE1
                        BUFFER [16] = VALUE.BYTE0
                       
                        SOMEVALUE = ' <insert converted C code here >
                        GOSUB LOOK_CHKSUM
                       
                        BUFFER [17] = CHKSUM.BYTE3
                        BUFFER [18] = CHKSUM.BYTE2
                        BUFFER [19] = CHKSUM.BYTE1
                        BUFFER [20] = CHKSUM.BYTE0
                       
                       
                        FOR TEMP_W = 1 TO SIZE
                                TEMP_B = BUFFER [TEMP_W]
                                HSEROUT [TEMP_B]
                        NEXT
                        GOTO MAIN_LOOP
                       
                       
LOOK_CHKSUM:
                        LOOKUP2 SOMEVALUE,_
                                [$0000, $1021, $2042, etc ], CHKSUM
                        RETURN

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Dohh... Here is the attachment.

hi timmers, you example is for calculate cyclic redundancy check (CRC16). look here two example one using Vb6 the another one with PBP. i use both

http://www.picbasic.co.uk/forum/showthread.php?t=16735

here explain how to that:

http://en.wikipedia.org/wiki/Computation_of_CRC

I am still struggling to learn C myself so what I say here MAY BE TOTALLY INCORRECT.

const u16 crc_16_table[0x100]

const u16 = dataType , crc_16_table = varName, [0x100] = startMemLocation, & this can be put into program memory with PROGMEM command at least in arduino.
HTH