How to count bit patterns in a file ?

Think of the following:
You have two files that you want to compare bit by bit.
A file has been send the other one has been received.
The two files can be of different size (Connection lost).
But you not only want to know how many bits are different you want also to know the run length of the different bits.
For example:
File 1:                      1010101011101010111101011001
File 2:                     1011101010001101010111010101
What is the result ?
Xor File1 and File2:   0001000001100111101010001100
Run Length 1:           3
Run Length 2:           2
Run Length 3:           0
Run Length 4:           1
I hope I didn't make a mistake.
Think also of using a blocksize for comparison.
Maybe you don't want to compare the files as a whole but want to know the number of errors for every block that is maybe 256 bit or 1024 bit. So read the files block by block, xor the blocks and count the bit errors by their run length.
So how can I get this result in LabView ?
Which data types do I have to take for comparison ? Which VIs do I have to use ?
Thanx for help and your time

Hi Allen,
thanks for your posting.
I have now a working version.
For my as LabView newbee this was really hard work.
So how many bit patterns of "1" or "11" or "111" or "1111" are in the xor result of the two files ?
Or you can also ask: How long is the error (Burst error) ? And how often does it occur ?
Look for example for block error codes and this stuff.
Attached is the VI and two small text files (Both 10 Bytes).
I've tried a blocksize of 10 Bytes and also 5 Bytes.
The result is:
1 2 3 4
16 5 1 1
So there 16 errors of run length 1, 5 of run length 2 and so on.
Would be also nice to count special bit patterns like '1001101010111" or something like that.
But I think this is more easy.
Not the pattern is searched. The first 1 and the following 0 is searched.
The run length is used as index.
Attachments:
Filediff 4.vi ‏32 KB
Kopie1 von REAMDE.txt ‏1 KB
Kopie2 von REAMDE.txt ‏1 KB

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