reading binary file content into an mpz_t variable

Sam Rawlins sam.rawlins at
Mon Jan 17 03:32:33 CET 2011

On Sun, Jan 16, 2011 at 4:02 PM, Erick Paquin <info at> wrote:

> Hi Everyone,
> Please bear with me as my programming skills are still relatively new.
> I've tried a few things but I cannot seem to do what I want.
> I would basically like to read the "entire" content of a file (its
> hex/binary content) into an mpz_t variable for later processing.
> I've tried with both the mpz_inp_str and the mpz_inp_raw functions and when
> I try to see the number of bytes read from these functions it always either
> returns 0 (as if an error occurred) or it crashes the application with a
> memory segmentation fault.

Without seeing your code, this is impossible to debug.

> Actually I am not also 100% sure of how to "read" the size_t returned value
> from the gmp functions (do you assign the function to an int variable and
> read it?). Any help on that too would be awesome.
> How would you go about in the simplest way possible read the entire content
> of a file into an mpz_t variable?
> I've also tried with fread which actually works but then to transfer the
> content of my fread into an mpz_t variable I couldn't find how.

Here too; need to see your code.

> Any tips?
> Thanks,
> Erick P.
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> gmp-discuss at

Sam Rawlins

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