endian conversions

Standard data type conversions are fairly straight forward but how do
I handle user defined data types with bit fields and fields that cross
boundaries(word, half-word)? Eg/

struct Foo_t{
int f1:1;
int f2:3;
int f3:4;
int f4:24;
};

What needs to be swapped, if anything, for fields f1, f2, && f3 going
from one endian to the other?

Will f4 cause problems? I haven't done this in a while, and the last
time was in Ada95, but I could swear that fields that don't line up on
word and half-word boundaries gave me sigsegv's.

(Assume that this is running on a 32-bit machine.)

Thanks.

.

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