File: endian_swap.h

package info (click to toggle)
bowtie2 2.2.4-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 20,280 kB
  • ctags: 5,481
  • sloc: cpp: 58,605; perl: 1,190; sh: 1,036; makefile: 370; ansic: 122; python: 95
file content (137 lines) | stat: -rw-r--r-- 3,732 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * Copyright 2011, Ben Langmead <langmea@cs.jhu.edu>
 *
 * This file is part of Bowtie 2.
 *
 * Bowtie 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Bowtie 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Bowtie 2.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ENDIAN_SWAP_H
#define ENDIAN_SWAP_H

#include <stdint.h>
#include <inttypes.h>
#include "assert_helpers.h"

#ifdef BOWTIE_64BIT_INDEX
#   define endianSwapU(x) endianSwapU64(x)
#   define endianSwapI(x) endianSwapI64(x)
#else
#   define endianSwapU(x) endianSwapU32(x)
#   define endianSwapI(x) endianSwapI32(x)
#endif

/**
 * Return true iff the machine running this program is big-endian.
 */
static inline bool currentlyBigEndian() {
	static uint8_t endianCheck[] = {1, 0, 0, 0};
	return *((uint32_t*)endianCheck) != 1;
}

/**
 * Return copy of uint32_t argument with byte order reversed.
 */
static inline uint32_t endianSwapU32(uint32_t u) {
	uint32_t tmp = 0;
	tmp |= ((u >> 24) & (0xff <<  0));
	tmp |= ((u >>  8) & (0xff <<  8));
	tmp |= ((u <<  8) & (0xff << 16));
	tmp |= ((u << 24) & (0xff << 24));
	return tmp;
}

/**
 * Return copy of uint64_t argument with byte order reversed.
 */
static inline uint64_t endianSwapU64(uint64_t u) {
	uint64_t tmp = 0;
	tmp |= ((u >> 56) & (0xffull <<  0));
	tmp |= ((u >> 40) & (0xffull <<  8));
	tmp |= ((u >> 24) & (0xffull << 16));
	tmp |= ((u >>  8) & (0xffull << 24));
	tmp |= ((u <<  8) & (0xffull << 32));
	tmp |= ((u << 24) & (0xffull << 40));
	tmp |= ((u << 40) & (0xffull << 48));
	tmp |= ((u << 56) & (0xffull << 56));
	return tmp;
}


/**
 * Return copy of int32_t argument with byte order reversed.
 */
static inline int32_t endianSwapI32(int32_t i) {
	int32_t tmp = 0;
	tmp |= ((i >> 24) & (0xff <<  0));
	tmp |= ((i >>  8) & (0xff <<  8));
	tmp |= ((i <<  8) & (0xff << 16));
	tmp |= ((i << 24) & (0xff << 24));
	return tmp;
}

/**
 * Return copy of int64_t argument with byte order reversed.
 */
static inline int64_t endianSwapI64(int64_t u) {
        int64_t tmp = 0;
        tmp |= ((u >> 56) & (0xffull <<  0));
        tmp |= ((u >> 40) & (0xffull <<  8));
        tmp |= ((u >> 24) & (0xffull << 16));
        tmp |= ((u >>  8) & (0xffull << 24));
        tmp |= ((u <<  8) & (0xffull << 32));
        tmp |= ((u << 24) & (0xffull << 40));
        tmp |= ((u << 40) & (0xffull << 48));
        tmp |= ((u << 56) & (0xffull << 56));
        return tmp;
}

/**
 * Convert uint32_t/uint64_t argument to the specified endianness.  It's assumed
 * that u currently has the endianness of the current machine.
 */
template <typename T>
static inline T endianizeU(T u, bool toBig) {
	if(toBig == currentlyBigEndian()) {
		return u;
	}
	if(sizeof(T) == 4) {
		return endianSwapU32((uint32_t)u);
	} else if(sizeof(T) == 8) {
		return endianSwapU64((uint64_t)u);
	} else {
		assert(false);
	}
}


/**
 * Convert int32_t/int64_t argument to the specified endianness.  It's assumed
 * that u currently has the endianness of the current machine.
 */
template <typename T>
static inline T endianizeI(T i, bool toBig) {
	if(toBig == currentlyBigEndian()) {
		return i;
	}
	if(sizeof(T) == 4) {
		return endianSwapI32((int32_t)i);
	} else if(sizeof(T) == 8) {
		return endianSwapI64((int64_t)i);
	} else {
		assert(false);
	}
}

#endif