CODEWITHSUNDEEP
encodinghexdecoding
Naveen Singh
Naveen Singh

Reputation: 184

Hex Encoding and Decoding

I have two modules in some 3rd party application(it does not have any documentation and I cannot reveal application name due to confidentiality). One module outputs only integers and other outputs only floating point numbers.

The module that outputs integers has very simple data format as it was HEX representation of numbers in reverse byte order. So, I am able to decode it successfully. But having issues in decoding HEX representation of floating point numbers.

The data below shows the data dump in HEX followed by the expected converted value. I have a little information about its representation that the last two bytes are some sort of CRC, so, it is like 8 byte number with two CRC bytes. I have highlighted the 8 bytes that needs to be converted and their expected value is given below :

Dataset 1: 02 B5 E6 7B 15 C8 0C 00 0A F9 = 999359.533

Dataset 2: 7C 4C 3A 00 00 00 00 00 B7 4C = 0.001

Can anyone suggest something here, I have tried many encoding schemes including IEEE formats also. I do not have any other relevant information that I can share(I know it will be a hit and trial technique to solve this).

Upvotes: 0

Views: 835

Answers (1)

Peter Hull
Peter Hull

Reputation: 7067

Not sure if this helps but:

02 B5 E6 7B 15 C8 0C 00 = 0x000CC8157BE6B502 = 3597694319113474

7C 4C 3A 00 00 00 00 00 = 0x00000000003A4C7C = 3820668

and

3597694319113474 / 3600000000 = 999359.5331

3820668 / 3600000000 = 0.001061297

So within a certain amount of rounding maybe they are fixed point numbers in fractions of 3600000000?

Can you get some more data points?

Upvotes: 2

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