Process a String in Increments?

[Stripey]

I have an MFC application that allows a user to input a string of up to 400 charachters. I need to then allocate memory in a buffer to do some processing on the data (encryption). How can I ensure that the size of the buffer is divisible by 8 and still allocate the memory dynamically?

Thanks for any help.

Stripey

 

[StukA]

You need to allocate ((strlen(buffer) / 8) + (strlen(buffer) % 8) ? 1 : 0) * 8 bytes - and pad the last (allocated length) - strlen(buffer) % 8 - 1 bytes with whatever dummy data you need.

 

[Stripey]

So, something like this (assuming szMessage has data in it)? How would you go about padding the data? Thanks for the reply.

Stripey

LPTSTR szMessage;
PVOID pvBuffer;
int nSize;

nSize = ((strlen(szMessage) / 8) + (strlen(szMessage) % 8) ? 1 : 0) * 8;

pvBuffer = VirtualAlloc(NULL, nAmount,  MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);