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Minor fixes and additions to the GMP wrapping.

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R=rsc
APPROVED=rsc
DELTA=12  (11 added, 0 deleted, 1 changed)
OCL=35715
CL=35715
This commit is contained in:
Adam Langley 2009-10-14 10:56:19 -07:00
parent b7ef541f35
commit f554ef7816
1 changed files with 12 additions and 1 deletions
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13
misc/cgo/gmp/gmp.go
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@ -197,6 +197,9 @@ func (z *Int) SetString(s string, base int) os.Error {
// String returns the decimal representation of z. // String returns the decimal representation of z.
func (z *Int) String() string { func (z *Int) String() string {
if z == nil {
return "nil";
}
z.doinit(); z.doinit();
p := C.mpz_get_str(nil, 10, &z.i[0]); p := C.mpz_get_str(nil, 10, &z.i[0]);
s := C.GoString(p); s := C.GoString(p);
@ -253,7 +256,7 @@ func (z *Int) Div(x, y *Int) *Int {
} }
// Mod sets z = x % y and returns z. // Mod sets z = x % y and returns z.
// XXX Unlike in Go, the result is always positive. // Like the result of the Go % operator, z has the same sign as x.
func (z *Int) Mod(x, y *Int) *Int { func (z *Int) Mod(x, y *Int) *Int {
x.doinit(); x.doinit();
y.doinit(); y.doinit();
@ -361,3 +364,11 @@ func GcdInt(d, x, y, a, b *Int) {
b.doinit(); b.doinit();
C.mpz_gcdext(&d.i[0], &x.i[0], &y.i[0], &a.i[0], &b.i[0]); C.mpz_gcdext(&d.i[0], &x.i[0], &y.i[0], &a.i[0], &b.i[0]);
} }
// ProbablyPrime performs n Miller-Rabin tests to check whether z is prime.
// If it returns true, z is prime with probability 1 - 1/4^n.
// If it returns false, z is not prime.
func (z *Int) ProbablyPrime(n int) bool {
z.doinit();
return int(C.mpz_probab_prime_p(&z.i[0], C.int(n))) > 0;
}