How to add Bytes in a binary file?

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Hello All,

I have one Binary file. It is in motorola s37 format.
My Job is to read each and every line in a binary file and to verify the check sum in each and every line.
I am giving the sample
example that How to calculate checkSum.

Checksum calculation[edit]
The following example record:

S1137AF00A0A0D0000000000000000000000000061
is decoded to show how the checksum value is calculated as follows:

Add: add each byte 13 + 7A+F0 + 0A+0A+0D+00+00+00+00+00+00+00+00+00+00+00+00+00 = 19E (hex) total.
Mask: keep the least significant byte of the total = 9E (hex).
Complement: compute ones' complement of least significant byte = 61 (hex).

I need to Implement above in C#. Could you please Help me out

Posted 16-Jun-15 1:52am

nsirisha

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CPallini 16-Jun-15 8:08am

It doesn't look a daunting task. What is your doubt about?

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OriginalGriff · Accepted Answer · 2015-06-16T02:38:00

So do it, S37 (or SREC as it is properly known) isn't complicated: https://en.wikipedia.org/wiki/SREC_(file_format)[^]

All you have to do is:
1) Read each line
2) Strip off the line header bytes ("S0", "S1", etc.)
3) Pull out the in-file checksum, and convert it to a byte
4) Read each pair of hex digits into a byte.
5) Sum all the bytes.
6) Complement the sum.
7) Compare the calculated value with the in=file value you processed earlier.
8) Continue from (2) with the next line.

This isn't complex: but it's your homework, so I'll give you no code!