In addition to seek on open files, Python has a tell function … so I could save my place in a file and go back to it? Perhaps I am going about things wrong.
What I’m really trying to do is read in a structure from a file that is organized like this:
fh = open("myfile.bin")
c_length = ntoh(read(fh, UInt32))
c_type = read(fh, 4)
c_data = read(fh, c_length)
c_crc = ntoh(read(fh, UInt32))
# Then somehow fuse together c_length, c_type and c_crc,
# compute the CRC, then compare to c_crc.
To compute the CRC, I need to somehow fuse together c_length, c_type and c_data … which I had planned on doing with seek, but this won’t always happen at the beginning of the file … there are many such structures grouped together in the file. I also wanted to minimize the amount of reallocation of things.
Maybe refactor my CRC code to allow updating an on-going computation?
… thanks