/src/git/compat/bswap.h

Source
#ifndef COMPAT_BSWAP_H
#define COMPAT_BSWAP_H

/*
 * Let's make sure we always have a sane definition for ntohl()/htonl().
 * Some libraries define those as a function call, just to perform byte
 * shifting, bringing significant overhead to what should be a simple
 * operation.
 */

/*
 * Default version that the compiler ought to optimize properly with
 * constant values.
 */
static inline uint32_t default_swab32(uint32_t val)
{
  return (((val & 0xff000000) >> 24) |
    ((val & 0x00ff0000) >>  8) |
    ((val & 0x0000ff00) <<  8) |
    ((val & 0x000000ff) << 24));
}

static inline uint64_t default_bswap64(uint64_t val)
{
  return (((val & (uint64_t)0x00000000000000ffULL) << 56) |
    ((val & (uint64_t)0x000000000000ff00ULL) << 40) |
    ((val & (uint64_t)0x0000000000ff0000ULL) << 24) |
    ((val & (uint64_t)0x00000000ff000000ULL) <<  8) |
    ((val & (uint64_t)0x000000ff00000000ULL) >>  8) |
    ((val & (uint64_t)0x0000ff0000000000ULL) >> 24) |
    ((val & (uint64_t)0x00ff000000000000ULL) >> 40) |
    ((val & (uint64_t)0xff00000000000000ULL) >> 56));
}

/*
 * __has_builtin is available since Clang 10 and GCC 10.
 * Below is a fallback for older compilers.
 */
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif

#undef bswap32
#undef bswap64

#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64) || defined(_M_ARM64))

#include <stdlib.h>

#define bswap32(x) _byteswap_ulong(x)
#define bswap64(x) _byteswap_uint64(x)

#define GIT_LITTLE_ENDIAN 1234
#define GIT_BIG_ENDIAN 4321
#define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN

#elif __has_builtin(__builtin_bswap32) && __has_builtin(__builtin_bswap64)

#define bswap32(x) __builtin_bswap32((x))
#define bswap64(x) __builtin_bswap64((x))

#endif

#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)

# define GIT_BYTE_ORDER __BYTE_ORDER
# define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN
# define GIT_BIG_ENDIAN __BIG_ENDIAN

#elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)

# define GIT_BYTE_ORDER BYTE_ORDER
# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN
# define GIT_BIG_ENDIAN BIG_ENDIAN

#elif defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__)

# define GIT_BYTE_ORDER __BYTE_ORDER__
# define GIT_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
# define GIT_BIG_ENDIAN __ORDER_BIG_ENDIAN__

#elif !defined(GIT_BYTE_ORDER)

# define GIT_BIG_ENDIAN 4321
# define GIT_LITTLE_ENDIAN 1234

# if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
#  define GIT_BYTE_ORDER GIT_BIG_ENDIAN
# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
#  define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
# elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__)
#  define GIT_BYTE_ORDER GIT_BIG_ENDIAN
# elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__)
#  define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
# else
#  error "Cannot determine endianness"
# endif

#endif

#undef ntohl
#undef htonl
#undef ntohll
#undef htonll

#if GIT_BYTE_ORDER == GIT_BIG_ENDIAN
# define ntohl(x) (x)
# define htonl(x) (x)
# define ntohll(x) (x)
# define htonll(x) (x)
#else

# if defined(bswap32)
#  define ntohl(x) bswap32(x)
#  define htonl(x) bswap32(x)
# else
#  define ntohl(x) default_swab32(x)
#  define htonl(x) default_swab32(x)
# endif

# if defined(bswap64)
#  define ntohll(x) bswap64(x)
#  define htonll(x) bswap64(x)
# else
#  define ntohll(x) default_bswap64(x)
#  define htonll(x) default_bswap64(x)
# endif
#endif

static inline uint16_t get_be16(const void *ptr)
{
  const unsigned char *p = ptr;
  return  (uint16_t)p[0] << 8 |
    (uint16_t)p[1] << 0;
}

static inline uint32_t get_be32(const void *ptr)
{
  const unsigned char *p = ptr;
  return  (uint32_t)p[0] << 24 |
    (uint32_t)p[1] << 16 |
    (uint32_t)p[2] <<  8 |
    (uint32_t)p[3] <<  0;
}

static inline uint64_t get_be64(const void *ptr)
{
  const unsigned char *p = ptr;
  return  (uint64_t)get_be32(&p[0]) << 32 |
    (uint64_t)get_be32(&p[4]) <<  0;
}

static inline void put_be32(void *ptr, uint32_t value)
{
  unsigned char *p = ptr;
  p[0] = (value >> 24) & 0xff;
  p[1] = (value >> 16) & 0xff;
  p[2] = (value >>  8) & 0xff;
  p[3] = (value >>  0) & 0xff;
}

static inline void put_be64(void *ptr, uint64_t value)
{
  unsigned char *p = ptr;
  p[0] = (value >> 56) & 0xff;
  p[1] = (value >> 48) & 0xff;
  p[2] = (value >> 40) & 0xff;
  p[3] = (value >> 32) & 0xff;
  p[4] = (value >> 24) & 0xff;
  p[5] = (value >> 16) & 0xff;
  p[6] = (value >>  8) & 0xff;
  p[7] = (value >>  0) & 0xff;
}

#endif /* COMPAT_BSWAP_H */

Line	Count	Source
1		#ifndef COMPAT_BSWAP_H
2		#define COMPAT_BSWAP_H
3
4		/*
5		* Let's make sure we always have a sane definition for ntohl()/htonl().
6		* Some libraries define those as a function call, just to perform byte
7		* shifting, bringing significant overhead to what should be a simple
8		* operation.
9		*/
10
11		/*
12		* Default version that the compiler ought to optimize properly with
13		* constant values.
14		*/
15		static inline uint32_t default_swab32(uint32_t val)
16	0	{
17	0	return (((val & 0xff000000) >> 24) \|
18	0	((val & 0x00ff0000) >> 8) \|
19	0	((val & 0x0000ff00) << 8) \|
20	0	((val & 0x000000ff) << 24));
21	0	} Unexecuted instantiation: procinfo.c:default_swab32 Unexecuted instantiation: fopen.c:default_swab32 Unexecuted instantiation: strlcpy.c:default_swab32 Unexecuted instantiation: qsort_s.c:default_swab32 Unexecuted instantiation: system.c:default_swab32 Unexecuted instantiation: sha1.c:default_swab32 Unexecuted instantiation: ubc_check.c:default_swab32 Unexecuted instantiation: fsm-ipc-unix.c:default_swab32 Unexecuted instantiation: fsm-settings-unix.c:default_swab32 Unexecuted instantiation: fsm-path-utils-linux.c:default_swab32
22
23		static inline uint64_t default_bswap64(uint64_t val)
24	0	{
25	0	return (((val & (uint64_t)0x00000000000000ffULL) << 56) \|
26	0	((val & (uint64_t)0x000000000000ff00ULL) << 40) \|
27	0	((val & (uint64_t)0x0000000000ff0000ULL) << 24) \|
28	0	((val & (uint64_t)0x00000000ff000000ULL) << 8) \|
29	0	((val & (uint64_t)0x000000ff00000000ULL) >> 8) \|
30	0	((val & (uint64_t)0x0000ff0000000000ULL) >> 24) \|
31	0	((val & (uint64_t)0x00ff000000000000ULL) >> 40) \|
32	0	((val & (uint64_t)0xff00000000000000ULL) >> 56));
33	0	} Unexecuted instantiation: procinfo.c:default_bswap64 Unexecuted instantiation: fopen.c:default_bswap64 Unexecuted instantiation: strlcpy.c:default_bswap64 Unexecuted instantiation: qsort_s.c:default_bswap64 Unexecuted instantiation: system.c:default_bswap64 Unexecuted instantiation: sha1.c:default_bswap64 Unexecuted instantiation: ubc_check.c:default_bswap64 Unexecuted instantiation: fsm-ipc-unix.c:default_bswap64 Unexecuted instantiation: fsm-settings-unix.c:default_bswap64 Unexecuted instantiation: fsm-path-utils-linux.c:default_bswap64
34
35		/*
36		* __has_builtin is available since Clang 10 and GCC 10.
37		* Below is a fallback for older compilers.
38		*/
39		#ifndef __has_builtin
40		# define __has_builtin(x) 0
41		#endif
42
43		#undef bswap32
44		#undef bswap64
45
46		#if defined(_MSC_VER) && (defined(_M_IX86) \|\| defined(_M_X64) \|\| defined(_M_ARM64))
47
48		#include <stdlib.h>
49
50		#define bswap32(x) _byteswap_ulong(x)
51		#define bswap64(x) _byteswap_uint64(x)
52
53		#define GIT_LITTLE_ENDIAN 1234
54		#define GIT_BIG_ENDIAN 4321
55		#define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
56
57		#elif __has_builtin(__builtin_bswap32) && __has_builtin(__builtin_bswap64)
58
59	0	#define bswap32(x) __builtin_bswap32((x))
60	0	#define bswap64(x) __builtin_bswap64((x))
61
62		#endif
63
64		#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)
65
66		# define GIT_BYTE_ORDER __BYTE_ORDER
67		# define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN
68		# define GIT_BIG_ENDIAN __BIG_ENDIAN
69
70		#elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN)
71
72		# define GIT_BYTE_ORDER BYTE_ORDER
73		# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN
74		# define GIT_BIG_ENDIAN BIG_ENDIAN
75
76		#elif defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__)
77
78		# define GIT_BYTE_ORDER __BYTE_ORDER__
79		# define GIT_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
80		# define GIT_BIG_ENDIAN __ORDER_BIG_ENDIAN__
81
82		#elif !defined(GIT_BYTE_ORDER)
83
84		# define GIT_BIG_ENDIAN 4321
85		# define GIT_LITTLE_ENDIAN 1234
86
87		# if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
88		# define GIT_BYTE_ORDER GIT_BIG_ENDIAN
89		# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
90		# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
91		# elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__)
92		# define GIT_BYTE_ORDER GIT_BIG_ENDIAN
93		# elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__)
94		# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN
95		# else
96		# error "Cannot determine endianness"
97		# endif
98
99		#endif
100
101		#undef ntohl
102		#undef htonl
103		#undef ntohll
104		#undef htonll
105
106		#if GIT_BYTE_ORDER == GIT_BIG_ENDIAN
107		# define ntohl(x) (x)
108		# define htonl(x) (x)
109		# define ntohll(x) (x)
110		# define htonll(x) (x)
111		#else
112
113		# if defined(bswap32)
114	0	# define ntohl(x) bswap32(x)
115	0	# define htonl(x) bswap32(x)
116		# else
117		# define ntohl(x) default_swab32(x)
118		# define htonl(x) default_swab32(x)
119		# endif
120
121		# if defined(bswap64)
122	0	# define ntohll(x) bswap64(x)
123	0	# define htonll(x) bswap64(x)
124		# else
125		# define ntohll(x) default_bswap64(x)
126		# define htonll(x) default_bswap64(x)
127		# endif
128		#endif
129
130		static inline uint16_t get_be16(const void *ptr)
131	0	{
132	0	const unsigned char *p = ptr;
133	0	return (uint16_t)p[0] << 8 \|
134	0	(uint16_t)p[1] << 0;
135	0	} Unexecuted instantiation: procinfo.c:get_be16 Unexecuted instantiation: fopen.c:get_be16 Unexecuted instantiation: strlcpy.c:get_be16 Unexecuted instantiation: qsort_s.c:get_be16 Unexecuted instantiation: read-cache.c:get_be16 Unexecuted instantiation: system.c:get_be16 Unexecuted instantiation: sha1.c:get_be16 Unexecuted instantiation: ubc_check.c:get_be16 Unexecuted instantiation: fsm-ipc-unix.c:get_be16 Unexecuted instantiation: fsm-settings-unix.c:get_be16 Unexecuted instantiation: fsm-path-utils-linux.c:get_be16
136
137		static inline uint32_t get_be32(const void *ptr)
138	0	{
139	0	const unsigned char *p = ptr;
140	0	return (uint32_t)p[0] << 24 \|
141	0	(uint32_t)p[1] << 16 \|
142	0	(uint32_t)p[2] << 8 \|
143	0	(uint32_t)p[3] << 0;
144	0	} Unexecuted instantiation: packfile.c:get_be32 Unexecuted instantiation: procinfo.c:get_be32 Unexecuted instantiation: fopen.c:get_be32 Unexecuted instantiation: strlcpy.c:get_be32 Unexecuted instantiation: qsort_s.c:get_be32 Unexecuted instantiation: bloom.c:get_be32 Unexecuted instantiation: commit-graph.c:get_be32 Unexecuted instantiation: dir.c:get_be32 Unexecuted instantiation: ewah_io.c:get_be32 Unexecuted instantiation: fsmonitor.c:get_be32 Unexecuted instantiation: midx.c:get_be32 Unexecuted instantiation: pack-bitmap.c:get_be32 Unexecuted instantiation: pack-mtimes.c:get_be32 Unexecuted instantiation: pack-revindex.c:get_be32 Unexecuted instantiation: pseudo-merge.c:get_be32 Unexecuted instantiation: read-cache.c:get_be32 Unexecuted instantiation: system.c:get_be32 Unexecuted instantiation: sha1.c:get_be32 Unexecuted instantiation: ubc_check.c:get_be32 Unexecuted instantiation: sha256.c:get_be32 Unexecuted instantiation: fsm-ipc-unix.c:get_be32 Unexecuted instantiation: fsm-settings-unix.c:get_be32 Unexecuted instantiation: fsm-path-utils-linux.c:get_be32 Unexecuted instantiation: chunk-format.c:get_be32
145
146		static inline uint64_t get_be64(const void *ptr)
147	0	{
148	0	const unsigned char *p = ptr;
149	0	return (uint64_t)get_be32(&p[0]) << 32 \|
150	0	(uint64_t)get_be32(&p[4]) << 0;
151	0	} Unexecuted instantiation: packfile.c:get_be64 Unexecuted instantiation: procinfo.c:get_be64 Unexecuted instantiation: fopen.c:get_be64 Unexecuted instantiation: strlcpy.c:get_be64 Unexecuted instantiation: qsort_s.c:get_be64 Unexecuted instantiation: commit-graph.c:get_be64 Unexecuted instantiation: fsmonitor.c:get_be64 Unexecuted instantiation: midx.c:get_be64 Unexecuted instantiation: pack-bitmap.c:get_be64 Unexecuted instantiation: pack-revindex.c:get_be64 Unexecuted instantiation: pseudo-merge.c:get_be64 Unexecuted instantiation: system.c:get_be64 Unexecuted instantiation: sha1.c:get_be64 Unexecuted instantiation: ubc_check.c:get_be64 Unexecuted instantiation: fsm-ipc-unix.c:get_be64 Unexecuted instantiation: fsm-settings-unix.c:get_be64 Unexecuted instantiation: fsm-path-utils-linux.c:get_be64 Unexecuted instantiation: chunk-format.c:get_be64
152
153		static inline void put_be32(void *ptr, uint32_t value)
154	0	{
155	0	unsigned char *p = ptr;
156	0	p[0] = (value >> 24) & 0xff;
157	0	p[1] = (value >> 16) & 0xff;
158	0	p[2] = (value >> 8) & 0xff;
159	0	p[3] = (value >> 0) & 0xff;
160	0	} Unexecuted instantiation: packfile.c:put_be32 Unexecuted instantiation: procinfo.c:put_be32 Unexecuted instantiation: fopen.c:put_be32 Unexecuted instantiation: strlcpy.c:put_be32 Unexecuted instantiation: qsort_s.c:put_be32 Unexecuted instantiation: fsmonitor.c:put_be32 Unexecuted instantiation: read-cache.c:put_be32 Unexecuted instantiation: system.c:put_be32 Unexecuted instantiation: sha1.c:put_be32 Unexecuted instantiation: ubc_check.c:put_be32 Unexecuted instantiation: sha256.c:put_be32 Unexecuted instantiation: fsm-ipc-unix.c:put_be32 Unexecuted instantiation: fsm-settings-unix.c:put_be32 Unexecuted instantiation: fsm-path-utils-linux.c:put_be32
161
162		static inline void put_be64(void *ptr, uint64_t value)
163	0	{
164	0	unsigned char *p = ptr;
165	0	p[0] = (value >> 56) & 0xff;
166	0	p[1] = (value >> 48) & 0xff;
167	0	p[2] = (value >> 40) & 0xff;
168	0	p[3] = (value >> 32) & 0xff;
169	0	p[4] = (value >> 24) & 0xff;
170	0	p[5] = (value >> 16) & 0xff;
171	0	p[6] = (value >> 8) & 0xff;
172	0	p[7] = (value >> 0) & 0xff;
173	0	} Unexecuted instantiation: procinfo.c:put_be64 Unexecuted instantiation: fopen.c:put_be64 Unexecuted instantiation: strlcpy.c:put_be64 Unexecuted instantiation: qsort_s.c:put_be64 Unexecuted instantiation: system.c:put_be64 Unexecuted instantiation: sha1.c:put_be64 Unexecuted instantiation: ubc_check.c:put_be64 Unexecuted instantiation: fsm-ipc-unix.c:put_be64 Unexecuted instantiation: fsm-settings-unix.c:put_be64 Unexecuted instantiation: fsm-path-utils-linux.c:put_be64
174
175		#endif /* COMPAT_BSWAP_H */

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Created: 2026-10-17 07:15