Trying to parse a file

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PaulJG

I'm trying to learn how to correctly parse a 3DS file - for the experience - but having alittle trouble.

It seems the first 2 bytes are Hex numbers describing the current chunk identifer.. which I can get fine.

But the next 4 bytes contain the length of the chunk..

I'm not sure if its suppose to be in hex or just a decimal number, I presume its decimal..

So how do I read all four bytes, and get them to combine to be one number ?

I'm using this:

For cnt = 1 To 4
l_chunk_length = l_chunk_length + ReadByte(l_file)
Next

Which is giving me 34

I've no idea if this is the correct sum.. in a hex editor the 4 bytes are: 20 02 00 00

Is this correct ?