libgphoto2 photo camera library (libgphoto2) API: libgphoto2/gphoto2-endian.h Source File

libgphoto2 photo camera library (libgphoto2) API 2.5.32

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gphoto2-endian.h
1/* This file is generated automatically by configure */
2/* It is valid only for the system type i686-pc-linux-gnu */
3
4#ifndef GP_BYTEORDER_H
5#define GP_BYTEORDER_H
6
7/* ntohl and relatives live here */
8#include <arpa/inet.h>
9#define __HAVE_NTOHL
10
11/* Define generic byte swapping functions */
12#include <byteswap.h>
13#define swap16(x) bswap_16(x)
14#define swap32(x) bswap_32(x)
15#define swap64(x) bswap_64(x)
16
17/* The byte swapping macros have the form: */
18/* EENN[a]toh or htoEENN[a] where EE is be (big endian) or */
19/* le (little-endian), NN is 16 or 32 (number of bits) and a, */
20/* if present, indicates that the endian side is a pointer to an */
21/* array of uint8_t bytes instead of an integer of the specified length. */
22/* h refers to the host's ordering method. */
23
24/* So, to convert a 32-bit integer stored in a buffer in little-endian */
25/* format into a uint32_t usable on this machine, you could use: */
26/* uint32_t value = le32atoh(&buf[3]); */
27/* To put that value back into the buffer, you could use: */
28/* htole32a(&buf[3], value); */
29
30/* Define aliases for the standard byte swapping macros */
31/* Arguments to these macros must be properly aligned on natural word */
32/* boundaries in order to work properly on all architectures */
33#ifndef htobe16
34# ifdef __HAVE_NTOHL
35# define htobe16(x) htons(x)
36# else
37# ifdef WORDS_BIGENDIAN
38# define htobe16(x) (x)
39# else
40# define htobe16(x) swap16(x)
41# endif
42# endif
43#endif
44#ifndef htobe32
45# ifdef __HAVE_NTOHL
46# define htobe32(x) htonl(x)
47# else
48# ifdef WORDS_BIGENDIAN
49# define htobe32(x) (x)
50# else
51# define htobe32(x) swap32(x)
52# endif
53# endif
54#endif
55#ifndef be16toh
56# define be16toh(x) htobe16(x)
57#endif
58#ifndef be32toh
59# define be32toh(x) htobe32(x)
60#endif
61
62#define HTOBE16(x) (x) = htobe16(x)
63#define HTOBE32(x) (x) = htobe32(x)
64#define BE32TOH(x) (x) = be32toh(x)
65#define BE16TOH(x) (x) = be16toh(x)
66
67/* On little endian machines, these macros are null */
68#ifndef htole16
69# define htole16(x) (x)
70#endif
71#ifndef htole32
72# define htole32(x) (x)
73#endif
74#ifndef htole64
75# define htole64(x) (x)
76#endif
77#ifndef le16toh
78# define le16toh(x) (x)
79#endif
80#ifndef le32toh
81# define le32toh(x) (x)
82#endif
83#ifndef le64toh
84# define le64toh(x) (x)
85#endif
86
87#define HTOLE16(x) (void) (x)
88#define HTOLE32(x) (void) (x)
89#define HTOLE64(x) (void) (x)
90#define LE16TOH(x) (void) (x)
91#define LE32TOH(x) (void) (x)
92#define LE64TOH(x) (void) (x)
93
94/* These don't have standard aliases */
95#ifndef htobe64
96# define htobe64(x) swap64(x)
97#endif
98#ifndef be64toh
99# define be64toh(x) swap64(x)
100#endif
101
102#define HTOBE64(x) (x) = htobe64(x)
103#define BE64TOH(x) (x) = be64toh(x)
104
105/* Define the C99 standard length-specific integer types */
106#include <stdint.h>
107
108/* Here are some macros to create integers from a byte array */
109/* These are used to get and put integers from/into a uint8_t array */
110/* with a specific endianness. This is the most portable way to generate */
111/* and read messages to a network or serial device. Each member of a */
112/* packet structure must be handled separately. */
113
114/* The i386 and compatibles can handle unaligned memory access, */
115/* so use the optimized macros above to do this job */
116#ifndef be16atoh
117# define be16atoh(x) be16toh(*(uint16_t*)(x))
118#endif
119#ifndef be32atoh
120# define be32atoh(x) be32toh(*(uint32_t*)(x))
121#endif
122#ifndef be64atoh
123# define be64atoh(x) be64toh(*(uint64_t*)(x))
124#endif
125#ifndef le16atoh
126# define le16atoh(x) le16toh(*(uint16_t*)(x))
127#endif
128#ifndef le32atoh
129# define le32atoh(x) le32toh(*(uint32_t*)(x))
130#endif
131#ifndef le64atoh
132# define le64atoh(x) le64toh(*(uint64_t*)(x))
133#endif
134
135#ifndef htob16a
136# define htobe16a(a,x) *(uint16_t*)(a) = htobe16(x)
137#endif
138#ifndef htobe32a
139# define htobe32a(a,x) *(uint32_t*)(a) = htobe32(x)
140#endif
141#ifndef htobe64a
142# define htobe64a(a,x) *(uint64_t*)(a) = htobe64(x)
143#endif
144#ifndef htole16a
145# define htole16a(a,x) *(uint16_t*)(a) = htole16(x)
146#endif
147#ifndef htole32a
148# define htole32a(a,x) *(uint32_t*)(a) = htole32(x)
149#endif
150#ifndef htole64a
151# define htole64a(a,x) *(uint64_t*)(a) = htole64(x)
152#endif
153
154#endif /* GP_BYTEORDER_H */