Re: while trying to learn pack
- From: rich.japh@xxxxxxxxx (Richard Lee)
- Date: Sat, 26 Jul 2008 14:00:07 -0400
John W. Krahn wrote:
Richard Lee wrote:Thanks guys,I am begining to read bit of low level(assembly) book to just gain some knoweldge on inner workings of memory.
My quesiton is, if machine is 32 bit, even if it's accessing string 'A', it will have to fetch 32 bit (instead of 8 bit that requires to make that letter A ) ?
It depends on the CPU. An Intel compatible CPU has instructions to access 8 bit values from memory but some CPUs can only access 32 bit aligned data.
I know this is not a mailing list for this but i figure since it's closely related to pack, i thought someone would clarify for me.
It is not really related to pack() as pack() is a high level function that can hide the details of the CPUs addressing problems.
I am reading "step by step assembly language"... I am not sure i will read the whole thing but i just want to get better inner working of memory as my c book didn't do enough justice.
John
One more question, How do I look at binary file using perl? ( I am assuming unpack will be able to handle it ).
I am trying to see if I can peak into pcap file w/ unpack... what will require? ( I am trying to not use modules to learn )
Idea is to learn the pcap structure and use it to unpack somehow? I am not asking for anything specific in order to solve the problem.
I guess just reaching out for general idea. if that's possible.
Meanwhile I will keep reading. thanks for help!!
.
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