Binary to mpz_t

[James Buchanan]

Hi everyone,

I'd like to ask if anyone knows how I can slurp in binary data from a file
and convert it into an mpz_t big int.  For example, I'd like to open a file
in binary mode:

f = fopen("file.bin", "rb");

and suck in 512 bytes, i.e. a typical disk sector:

unsigned char stuff[512];
fread(stuff, sizeof(char), 512, f);

and then use whatever's in stuff[] to make the big int.  I'd like it to
interpret the 512-bit long bit pattern as an unsigned integer.  I'd also
like to be able to write it back out as a 512-bit long bit pattern.

How can I do this?

Many Thanks,
James