help - code with assembling pkt c++
Hello,
I would like to get some help with a problem, please.
I need to write a method that would assemble a buffer of say 14 bytes ( a packet) in which I need to assemble side by side a uint8 value1, a string value1_name, a uint8 value2, and contents of a file whose pointer and size are given.
the buffer location must be compiler allocated. The parameters value1_name, file ptr, size and value1 are passed to the function.
What would be the best way to write this?
Thank you in advance.
I would like to get some help with a problem, please.
I need to write a method that would assemble a buffer of say 14 bytes ( a packet) in which I need to assemble side by side a uint8 value1, a string value1_name, a uint8 value2, and contents of a file whose pointer and size are given.
the buffer location must be compiler allocated. The parameters value1_name, file ptr, size and value1 are passed to the function.
What would be the best way to write this?
Thank you in advance.
ASKER
No this is not an assignment. I am a professional.
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ASKER
Thank you infinity for your reply.
I am thinking of using malloc instead of creating an obj. and just passing the params to a asemble function.
I would like to discuss this question thread a little further and get some ideas from you. I want to make some improvements to my code in a day or 3. Can I keep this question open if you don't mind. (e.g. I would like to maybe create a generic assemble function to assemble packets with different components. Or add this packet struct as a part of a bigger class that everything is a part of. Don't know if it would make sense to have structs for sets of data that constitute pkts of different types.)
Thank you again.
I am thinking of using malloc instead of creating an obj. and just passing the params to a asemble function.
I would like to discuss this question thread a little further and get some ideas from you. I want to make some improvements to my code in a day or 3. Can I keep this question open if you don't mind. (e.g. I would like to maybe create a generic assemble function to assemble packets with different components. Or add this packet struct as a part of a bigger class that everything is a part of. Don't know if it would make sense to have structs for sets of data that constitute pkts of different types.)
Thank you again.
ASKER
Should I be following this obj creating approach instead of a malloc
>> Can I keep this question open if you don't mind.
No problem.
>> (e.g. I would like to maybe create a generic assemble function to assemble packets with different components.
What you maybe need is virtual methods, one for each packet type. They could then be treated generically.
>> Should I be following this obj creating approach instead of a malloc
I'm not sure what approach you have in mind, but by using a struct (or class), you group data that logically belongs together, which makes the code more readable, and more modular.
No problem.
>> (e.g. I would like to maybe create a generic assemble function to assemble packets with different components.
What you maybe need is virtual methods, one for each packet type. They could then be treated generically.
>> Should I be following this obj creating approach instead of a malloc
I'm not sure what approach you have in mind, but by using a struct (or class), you group data that logically belongs together, which makes the code more readable, and more modular.
ASKER
Thank you infinity, for your help, I think I am done.
>> What would be the best way to write this?
Write a function that takes the mentioned data as parameters, then simply allocate a buffer with enough memory (enough to contain all data), and copy the data into that buffer one by one using a pointer that "walks" through the buffer as it gets filled up.
Make use of memcpy and fread :
http://www.cplusplus.com/reference/clibrary/cstring/memcpy.html
http://www.cplusplus.com/reference/clibrary/cstdio/fread.html