/src/libgcrypt/mpi/mpi-cmp.c

Source (jump to first uncovered line)
/* mpi-cmp.c  -  MPI functions
 * Copyright (C) 1998, 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
 *
 * This file is part of Libgcrypt.
 *
 * Libgcrypt is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * Libgcrypt is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "mpi-internal.h"

int
_gcry_mpi_cmp_ui (gcry_mpi_t u, unsigned long v)
{
  mpi_limb_t limb = v;

  _gcry_mpi_normalize (u);

  /* Handle the case that U contains no limb.  */
  if (u->nlimbs == 0)
    return -(limb != 0);

  /* Handle the case that U is negative.  */
  if (u->sign)
    return -1;

  if (u->nlimbs == 1)
    {
      /* Handle the case that U contains exactly one limb.  */

      if (u->d[0] > limb)
  return 1;
      if (u->d[0] < limb)
  return -1;
      return 0;
    }
  else
    /* Handle the case that U contains more than one limb.  */
    return 1;
}


/* Helper for _gcry_mpi_cmp and _gcry_mpi_cmpabs.  */
static int
do_mpi_cmp (gcry_mpi_t u, gcry_mpi_t v, int absmode)
{
  mpi_size_t usize;
  mpi_size_t vsize;
  int usign;
  int vsign;
  int cmp;

  if (mpi_is_opaque (u) || mpi_is_opaque (v))
    {
      /* We have no signan and thus ABSMODE has no efeect here.  */
      if (mpi_is_opaque (u) && !mpi_is_opaque (v))
        return -1;
      if (!mpi_is_opaque (u) && mpi_is_opaque (v))
        return 1;
      if (!u->sign && !v->sign)
        return 0; /* Empty buffers are identical.  */
      if (u->sign < v->sign)
        return -1;
      if (u->sign > v->sign)
        return 1;
      return memcmp (u->d, v->d, (u->sign+7)/8);
    }
  else
    {
      _gcry_mpi_normalize (u);
      _gcry_mpi_normalize (v);

      usize = u->nlimbs;
      vsize = v->nlimbs;
      usign = absmode? 0 : u->sign;
      vsign = absmode? 0 : v->sign;

      /* Special treatment for +0 == -0 */
      if (!usize && !vsize)
        return 0;

      /* Compare sign bits.  */
      if (!usign && vsign)
        return 1;
      if (usign && !vsign)
        return -1;

      /* U and V are either both positive or both negative.  */

      if (usize != vsize && !usign && !vsign)
        return usize - vsize;
      if (usize != vsize && usign && vsign)
        return vsize + usize;
      if (!usize )
        return 0;
      if (!(cmp = _gcry_mpih_cmp (u->d, v->d, usize)))
        return 0;
      if ((cmp < 0?1:0) == (usign?1:0))
        return 1;
    }
  return -1;
}


int
_gcry_mpi_cmp (gcry_mpi_t u, gcry_mpi_t v)
{
  return do_mpi_cmp (u, v, 0);
}

/* Compare only the absolute values.  */
int
_gcry_mpi_cmpabs (gcry_mpi_t u, gcry_mpi_t v)
{
  return do_mpi_cmp (u, v, 1);
}

Line	Count	Source (jump to first uncovered line)
1		/* mpi-cmp.c - MPI functions
2		* Copyright (C) 1998, 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
3		*
4		* This file is part of Libgcrypt.
5		*
6		* Libgcrypt is free software; you can redistribute it and/or modify
7		* it under the terms of the GNU Lesser General Public License as
8		* published by the Free Software Foundation; either version 2.1 of
9		* the License, or (at your option) any later version.
10		*
11		* Libgcrypt is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14		* GNU Lesser General Public License for more details.
15		*
16		* You should have received a copy of the GNU Lesser General Public
17		* License along with this program; if not, write to the Free Software
18		* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19		*/
20
21		#include <config.h>
22		#include <stdio.h>
23		#include <stdlib.h>
24		#include "mpi-internal.h"
25
26		int
27		_gcry_mpi_cmp_ui (gcry_mpi_t u, unsigned long v)
28	3.90M	{
29	3.90M	mpi_limb_t limb = v;
30
31	3.90M	_gcry_mpi_normalize (u);
32
33		/* Handle the case that U contains no limb. */
34	3.90M	if (u->nlimbs == 0)
35	679	return -(limb != 0);
36
37		/* Handle the case that U is negative. */
38	3.90M	if (u->sign)
39	0	return -1;
40
41	3.90M	if (u->nlimbs == 1)
42	732k	{
43		/* Handle the case that U contains exactly one limb. */
44
45	732k	if (u->d[0] > limb)
46	367k	return 1;
47	364k	if (u->d[0] < limb)
48	0	return -1;
49	364k	return 0;
50	364k	}
51	3.16M	else
52		/* Handle the case that U contains more than one limb. */
53	3.16M	return 1;
54	3.90M	}
55
56
57		/* Helper for _gcry_mpi_cmp and _gcry_mpi_cmpabs. */
58		static int
59		do_mpi_cmp (gcry_mpi_t u, gcry_mpi_t v, int absmode)
60	423k	{
61	423k	mpi_size_t usize;
62	423k	mpi_size_t vsize;
63	423k	int usign;
64	423k	int vsign;
65	423k	int cmp;
66
67	423k	if (mpi_is_opaque (u) \|\| mpi_is_opaque (v))
68	0	{
69		/* We have no signan and thus ABSMODE has no efeect here. */
70	0	if (mpi_is_opaque (u) && !mpi_is_opaque (v))
71	0	return -1;
72	0	if (!mpi_is_opaque (u) && mpi_is_opaque (v))
73	0	return 1;
74	0	if (!u->sign && !v->sign)
75	0	return 0; /* Empty buffers are identical. */
76	0	if (u->sign < v->sign)
77	0	return -1;
78	0	if (u->sign > v->sign)
79	0	return 1;
80	0	return memcmp (u->d, v->d, (u->sign+7)/8);
81	0	}
82	423k	else
83	423k	{
84	423k	_gcry_mpi_normalize (u);
85	423k	_gcry_mpi_normalize (v);
86
87	423k	usize = u->nlimbs;
88	423k	vsize = v->nlimbs;
89	423k	usign = absmode? 0 : u->sign;
90	423k	vsign = absmode? 0 : v->sign;
91
92		/* Special treatment for +0 == -0 */
93	423k	if (!usize && !vsize)
94	0	return 0;
95
96		/* Compare sign bits. */
97	423k	if (!usign && vsign)
98	0	return 1;
99	423k	if (usign && !vsign)
100	0	return -1;
101
102		/* U and V are either both positive or both negative. */
103
104	423k	if (usize != vsize && !usign && !vsign)
105	30.8k	return usize - vsize;
106	392k	if (usize != vsize && usign && vsign)
107	0	return vsize + usize;
108	392k	if (!usize )
109	0	return 0;
110	392k	if (!(cmp = _gcry_mpih_cmp (u->d, v->d, usize)))
111	12.8k	return 0;
112	379k	if ((cmp < 0?1:0) == (usign?1:0))
113	238k	return 1;
114	379k	}
115	141k	return -1;
116	423k	}
117
118
119		int
120		_gcry_mpi_cmp (gcry_mpi_t u, gcry_mpi_t v)
121	401k	{
122	401k	return do_mpi_cmp (u, v, 0);
123	401k	}
124
125		/* Compare only the absolute values. */
126		int
127		_gcry_mpi_cmpabs (gcry_mpi_t u, gcry_mpi_t v)
128	21.8k	{
129	21.8k	return do_mpi_cmp (u, v, 1);
130	21.8k	}

Coverage Report

Created: 2022-12-08 06:09