How do i read given binary file and also want to read 4 bit from a byte of that file.
It is a "Call Details Record" of Mobile calls. I faced following problem to read that file
1. Its 844KB file, with 907Byte same format several data and i need to read each data(907) and saved it to a separate files.
2. There is a single byte on the offset 9 where i need to read the last 4bit and first 4bit separately.

I am...