Network/Host byte ordering and bitfields

[Marcio O. Buss]

Hi Eljay,

Thanks very much for your prompt feedback! Regarding to the
C or C++ question, I would be doing this in C and would be
very glad in having the short example you mentioned.

Thanks again,
-Marcio.

On Wed, 23 Jun 2004, Eljay Love-Jensen wrote:
>
> Hi Marcio,
>
> I'm well versed in the issues you are hitting upon.
>
> Are you using C or C++?
>
> The solution is similar in C and C++, but C++ allows encapsulation
> so the implementation (from an outside perspective) may seem a little
> cleaner.
>
> In either case, I recommend saving your "unsigned int a : 1" into it's
> very own byte.  Save "unsigned int b : 26" into 4 bytes (in network
> order in your serialized persistent store canonical file).  And save
> your "unsigned int c : 3" in its very own byte.
>
> What you'll be writing are two routines:  a serializing "write" (memory
> to store) and marshalling "read" (store to memory).  In C they'll be
> two standalone routine named "writeStructA(FILE* out, struct A* x);"
> and "readStructA(FILE* in, struct A* x);".  For C++, you'll add two
> member methods, "write(std::ostream&)" and "read(std::istream&)".
>
> Once you let me know the C or C++ question, I can provide a more
> complete short example using your struct A.
>
> --Eljay