C bit structure

[Alec Shaw]

I want to implement a struct that is 4 bytes in size that has alternate 
bit fields
similar to the following.  The struct below is 12 bytes in size.
Any suggestions on how create a similar structure of only 4 bytes.
I want to overlay the structure on a character stream.
typedef struct {
   unsigned int a:8;
   union {
       struct {
           unsigned int 1ba:4;
           unsigned int 1bb:4;
       } type1b;
       struct {
           unsigned int 2ba:8;
       } type2b;
       struct {
           unsigned int 3ba:1;
           unsigned int 3bb:1;
           unsigned int 3bc:1;
           unsigned int 3bd:2;
           unsigned int 3be:3;
       } type3b;
   } u;
   unsigned int c:16;
} mystruct;

Thanks
Alec Shaw


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