Thread: How do I read in five bytes and compare the first four and if it is ok then keep

How about you write that out in steps before you start trying to program it?


Quzah.

I'm not sure how to.
I need to read in five bytes and look at the data if I come accross a certain symbol in hex only write out the first two or three or four keeping the remander for the buffer and refill the rest of the buffer.
Thanks

If you can't plan out in words what steps you would need to do, then you have no hope of programming it. Think about it in simple abstract steps, not in actual code.


Quzah.

If first byte = A & second byte = A but third byte != A then write out AA(whatever the value of the third byte), and read in three more bytes behind the leftovers.
If first byte !=A then write out the five bytes and read in five new fresh ones.

The reason I didn't just start handing out code was because you need to learn how to describe in detail what you really need, and then to break those things into small tasks.

Code:

open one file for reading, call it input
open one file for writing, call it output
while there is still stuff in the input file, do this:
    1. Check for the appropriate bytes.
    2. Write if we have a match.
close both files

Now, you have to break each of those steps into as many small tasks as you need to, so that each step you need to do is as clear as possible. Once you understand all of the steps, you can think about coding it.


Quzah.