/src/gnutls/gl/bitrotate.h

Source (jump to first uncovered line)
/* bitrotate.h - Rotate bits in integers
   Copyright (C) 2008-2023 Free Software Foundation, Inc.

   This file 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.

   This file 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, see <https://www.gnu.org/licenses/>.  */

/* Written by Simon Josefsson <simon@josefsson.org>, 2008. */

#ifndef _GL_BITROTATE_H
#define _GL_BITROTATE_H

#include <limits.h>
#include <stdint.h>
#include <sys/types.h>

#ifndef _GL_INLINE_HEADER_BEGIN
 #error "Please include config.h first."
#endif
_GL_INLINE_HEADER_BEGIN
#ifndef BITROTATE_INLINE
# define BITROTATE_INLINE _GL_INLINE
#endif

#ifdef UINT64_MAX
/* Given an unsigned 64-bit argument X, return the value corresponding
   to rotating the bits N steps to the left.  N must be between 1 and
   63 inclusive. */
BITROTATE_INLINE uint64_t
rotl64 (uint64_t x, int n)
{
  return ((x << n) | (x >> (64 - n))) & UINT64_MAX;
}

/* Given an unsigned 64-bit argument X, return the value corresponding
   to rotating the bits N steps to the right.  N must be between 1 to
   63 inclusive.*/
BITROTATE_INLINE uint64_t
rotr64 (uint64_t x, int n)
{
  return ((x >> n) | (x << (64 - n))) & UINT64_MAX;
}
#endif

/* Given an unsigned 32-bit argument X, return the value corresponding
   to rotating the bits N steps to the left.  N must be between 1 and
   31 inclusive. */
BITROTATE_INLINE uint32_t
rotl32 (uint32_t x, int n)
{
  return ((x << n) | (x >> (32 - n))) & UINT32_MAX;
}

/* Given an unsigned 32-bit argument X, return the value corresponding
   to rotating the bits N steps to the right.  N must be between 1 to
   31 inclusive.*/
BITROTATE_INLINE uint32_t
rotr32 (uint32_t x, int n)
{
  return ((x >> n) | (x << (32 - n))) & UINT32_MAX;
}

/* Given a size_t argument X, return the value corresponding
   to rotating the bits N steps to the left.  N must be between 1 and
   (CHAR_BIT * sizeof (size_t) - 1) inclusive.  */
BITROTATE_INLINE size_t
rotl_sz (size_t x, int n)
{
  return ((x << n) | (x >> ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
}

/* Given a size_t argument X, return the value corresponding
   to rotating the bits N steps to the right.  N must be between 1 to
   (CHAR_BIT * sizeof (size_t) - 1) inclusive.  */
BITROTATE_INLINE size_t
rotr_sz (size_t x, int n)
{
  return ((x >> n) | (x << ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
}

/* Given an unsigned 16-bit argument X, return the value corresponding
   to rotating the bits N steps to the left.  N must be between 1 to
   15 inclusive, but on most relevant targets N can also be 0 and 16
   because 'int' is at least 32 bits and the arguments must widen
   before shifting. */
BITROTATE_INLINE uint16_t
rotl16 (uint16_t x, int n)
{
  return (((unsigned int) x << n) | ((unsigned int) x >> (16 - n)))
         & UINT16_MAX;
}

/* Given an unsigned 16-bit argument X, return the value corresponding
   to rotating the bits N steps to the right.  N must be in 1 to 15
   inclusive, but on most relevant targets N can also be 0 and 16
   because 'int' is at least 32 bits and the arguments must widen
   before shifting. */
BITROTATE_INLINE uint16_t
rotr16 (uint16_t x, int n)
{
  return (((unsigned int) x >> n) | ((unsigned int) x << (16 - n)))
         & UINT16_MAX;
}

/* Given an unsigned 8-bit argument X, return the value corresponding
   to rotating the bits N steps to the left.  N must be between 1 to 7
   inclusive, but on most relevant targets N can also be 0 and 8
   because 'int' is at least 32 bits and the arguments must widen
   before shifting. */
BITROTATE_INLINE uint8_t
rotl8 (uint8_t x, int n)
{
  return (((unsigned int) x << n) | ((unsigned int) x >> (8 - n))) & UINT8_MAX;
}

/* Given an unsigned 8-bit argument X, return the value corresponding
   to rotating the bits N steps to the right.  N must be in 1 to 7
   inclusive, but on most relevant targets N can also be 0 and 8
   because 'int' is at least 32 bits and the arguments must widen
   before shifting. */
BITROTATE_INLINE uint8_t
rotr8 (uint8_t x, int n)
{
  return (((unsigned int) x >> n) | ((unsigned int) x << (8 - n))) & UINT8_MAX;
}

_GL_INLINE_HEADER_END

#endif /* _GL_BITROTATE_H */

Line	Count	Source (jump to first uncovered line)
1		/* bitrotate.h - Rotate bits in integers
2		Copyright (C) 2008-2023 Free Software Foundation, Inc.
3
4		This file is free software: you can redistribute it and/or modify
5		it under the terms of the GNU Lesser General Public License as
6		published by the Free Software Foundation; either version 2.1 of the
7		License, or (at your option) any later version.
8
9		This file is distributed in the hope that it will be useful,
10		but WITHOUT ANY WARRANTY; without even the implied warranty of
11		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12		GNU Lesser General Public License for more details.
13
14		You should have received a copy of the GNU Lesser General Public License
15		along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17		/* Written by Simon Josefsson <simon@josefsson.org>, 2008. */
18
19		#ifndef _GL_BITROTATE_H
20		#define _GL_BITROTATE_H
21
22		#include <limits.h>
23		#include <stdint.h>
24		#include <sys/types.h>
25
26		#ifndef _GL_INLINE_HEADER_BEGIN
27		#error "Please include config.h first."
28		#endif
29		_GL_INLINE_HEADER_BEGIN
30		#ifndef BITROTATE_INLINE
31		# define BITROTATE_INLINE _GL_INLINE
32		#endif
33
34		#ifdef UINT64_MAX
35		/* Given an unsigned 64-bit argument X, return the value corresponding
36		to rotating the bits N steps to the left. N must be between 1 and
37		63 inclusive. */
38		BITROTATE_INLINE uint64_t
39		rotl64 (uint64_t x, int n)
40	0	{
41	0	return ((x << n) \| (x >> (64 - n))) & UINT64_MAX;
42	0	}
43
44		/* Given an unsigned 64-bit argument X, return the value corresponding
45		to rotating the bits N steps to the right. N must be between 1 to
46		63 inclusive.*/
47		BITROTATE_INLINE uint64_t
48		rotr64 (uint64_t x, int n)
49	0	{
50	0	return ((x >> n) \| (x << (64 - n))) & UINT64_MAX;
51	0	}
52		#endif
53
54		/* Given an unsigned 32-bit argument X, return the value corresponding
55		to rotating the bits N steps to the left. N must be between 1 and
56		31 inclusive. */
57		BITROTATE_INLINE uint32_t
58		rotl32 (uint32_t x, int n)
59	0	{
60	0	return ((x << n) \| (x >> (32 - n))) & UINT32_MAX;
61	0	}
62
63		/* Given an unsigned 32-bit argument X, return the value corresponding
64		to rotating the bits N steps to the right. N must be between 1 to
65		31 inclusive.*/
66		BITROTATE_INLINE uint32_t
67		rotr32 (uint32_t x, int n)
68	0	{
69	0	return ((x >> n) \| (x << (32 - n))) & UINT32_MAX;
70	0	}
71
72		/* Given a size_t argument X, return the value corresponding
73		to rotating the bits N steps to the left. N must be between 1 and
74		(CHAR_BIT * sizeof (size_t) - 1) inclusive. */
75		BITROTATE_INLINE size_t
76		rotl_sz (size_t x, int n)
77	0	{
78	0	return ((x << n) \| (x >> ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
79	0	}
80
81		/* Given a size_t argument X, return the value corresponding
82		to rotating the bits N steps to the right. N must be between 1 to
83		(CHAR_BIT * sizeof (size_t) - 1) inclusive. */
84		BITROTATE_INLINE size_t
85		rotr_sz (size_t x, int n)
86	0	{
87	0	return ((x >> n) \| (x << ((CHAR_BIT * sizeof x) - n))) & SIZE_MAX;
88	0	}
89
90		/* Given an unsigned 16-bit argument X, return the value corresponding
91		to rotating the bits N steps to the left. N must be between 1 to
92		15 inclusive, but on most relevant targets N can also be 0 and 16
93		because 'int' is at least 32 bits and the arguments must widen
94		before shifting. */
95		BITROTATE_INLINE uint16_t
96		rotl16 (uint16_t x, int n)
97	0	{
98	0	return (((unsigned int) x << n) \| ((unsigned int) x >> (16 - n)))
99	0	& UINT16_MAX;
100	0	}
101
102		/* Given an unsigned 16-bit argument X, return the value corresponding
103		to rotating the bits N steps to the right. N must be in 1 to 15
104		inclusive, but on most relevant targets N can also be 0 and 16
105		because 'int' is at least 32 bits and the arguments must widen
106		before shifting. */
107		BITROTATE_INLINE uint16_t
108		rotr16 (uint16_t x, int n)
109	0	{
110	0	return (((unsigned int) x >> n) \| ((unsigned int) x << (16 - n)))
111	0	& UINT16_MAX;
112	0	}
113
114		/* Given an unsigned 8-bit argument X, return the value corresponding
115		to rotating the bits N steps to the left. N must be between 1 to 7
116		inclusive, but on most relevant targets N can also be 0 and 8
117		because 'int' is at least 32 bits and the arguments must widen
118		before shifting. */
119		BITROTATE_INLINE uint8_t
120		rotl8 (uint8_t x, int n)
121	0	{
122	0	return (((unsigned int) x << n) \| ((unsigned int) x >> (8 - n))) & UINT8_MAX;
123	0	}
124
125		/* Given an unsigned 8-bit argument X, return the value corresponding
126		to rotating the bits N steps to the right. N must be in 1 to 7
127		inclusive, but on most relevant targets N can also be 0 and 8
128		because 'int' is at least 32 bits and the arguments must widen
129		before shifting. */
130		BITROTATE_INLINE uint8_t
131		rotr8 (uint8_t x, int n)
132	0	{
133	0	return (((unsigned int) x >> n) \| ((unsigned int) x << (8 - n))) & UINT8_MAX;
134	0	}
135
136		_GL_INLINE_HEADER_END
137
138		#endif /* _GL_BITROTATE_H */

Coverage Report

Created: 2023-03-26 08:33