mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-12-26 22:41:08 +00:00
63 lines
2 KiB
C
63 lines
2 KiB
C
/*
|
|
* Copyright (c) 2017 Dag-Erling Smørgrav
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "cryb/impl.h"
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include <cryb/mpi.h>
|
|
|
|
#include "cryb_mpi_impl.h"
|
|
|
|
/*
|
|
* Fast comparison of an MPI with a 64-bit integer
|
|
*/
|
|
int
|
|
mpi_eq_abs_u64(const cryb_mpi *A, uint64_t u)
|
|
{
|
|
|
|
return (A->msb < 64 && A->words[1] == (u >> 32) &&
|
|
A->words[0] == (u & 0xffffffffLU));
|
|
}
|
|
|
|
int
|
|
mpi_eq_u64(const cryb_mpi *A, uint64_t u)
|
|
{
|
|
|
|
return (!A->neg && mpi_eq_abs_u64(A, u));
|
|
}
|
|
|
|
int
|
|
mpi_eq_i64(const cryb_mpi *A, int64_t i)
|
|
{
|
|
|
|
return (A->neg ? (i < 0 && mpi_eq_abs_u64(A, -i)) :
|
|
(i >= 0 && mpi_eq_abs_u64(A, i)));
|
|
}
|