libmtp  0.1.4
gphoto2-endian.h
1 /* This file is generated automatically by configure */
2 /* It is valid only for the system type i686-buildroot-linux-gnu */
3 
4 #ifndef __BYTEORDER_H
5 #define __BYTEORDER_H
6 
7 /* ntohl and relatives live here */
8 #include <arpa/inet.h>
9 
10 /* Define generic byte swapping functions */
11 #include <byteswap.h>
12 #define swap16(x) bswap_16(x)
13 #define swap32(x) bswap_32(x)
14 #define swap64(x) bswap_64(x)
15 
16 /* The byte swapping macros have the form: */
17 /* EENN[a]toh or htoEENN[a] where EE is be (big endian) or */
18 /* le (little-endian), NN is 16 or 32 (number of bits) and a, */
19 /* if present, indicates that the endian side is a pointer to an */
20 /* array of uint8_t bytes instead of an integer of the specified length. */
21 /* h refers to the host's ordering method. */
22 
23 /* So, to convert a 32-bit integer stored in a buffer in little-endian */
24 /* format into a uint32_t usable on this machine, you could use: */
25 /* uint32_t value = le32atoh(&buf[3]); */
26 /* To put that value back into the buffer, you could use: */
27 /* htole32a(&buf[3], value); */
28 
29 /* Define aliases for the standard byte swapping macros */
30 /* Arguments to these macros must be properly aligned on natural word */
31 /* boundaries in order to work properly on all architectures */
32 #define htobe16(x) htons(x)
33 #define htobe32(x) htonl(x)
34 #define be16toh(x) ntohs(x)
35 #define be32toh(x) ntohl(x)
36 
37 #define HTOBE16(x) (x) = htobe16(x)
38 #define HTOBE32(x) (x) = htobe32(x)
39 #define BE32TOH(x) (x) = be32toh(x)
40 #define BE16TOH(x) (x) = be16toh(x)
41 
42 /* On little endian machines, these macros are null */
43 #define htole16(x) (x)
44 #define htole32(x) (x)
45 #define htole64(x) (x)
46 #define le16toh(x) (x)
47 #define le32toh(x) (x)
48 #define le64toh(x) (x)
49 
50 #define HTOLE16(x) (void) (x)
51 #define HTOLE32(x) (void) (x)
52 #define HTOLE64(x) (void) (x)
53 #define LE16TOH(x) (void) (x)
54 #define LE32TOH(x) (void) (x)
55 #define LE64TOH(x) (void) (x)
56 
57 /* These don't have standard aliases */
58 #define htobe64(x) swap64(x)
59 #define be64toh(x) swap64(x)
60 
61 #define HTOBE64(x) (x) = htobe64(x)
62 #define BE64TOH(x) (x) = be64toh(x)
63 
64 /* Define the C99 standard length-specific integer types */
65 #include "libptp-stdint.h"
66 
67 /* Here are some macros to create integers from a byte array */
68 /* These are used to get and put integers from/into a uint8_t array */
69 /* with a specific endianness. This is the most portable way to generate */
70 /* and read messages to a network or serial device. Each member of a */
71 /* packet structure must be handled separately. */
72 
73 /* The i386 and compatibles can handle unaligned memory access, */
74 /* so use the optimized macros above to do this job */
75 #define be16atoh(x) be16toh(*(uint16_t*)(x))
76 #define be32atoh(x) be32toh(*(uint32_t*)(x))
77 #define be64atoh(x) be64toh(*(uint64_t*)(x))
78 #define le16atoh(x) le16toh(*(uint16_t*)(x))
79 #define le32atoh(x) le32toh(*(uint32_t*)(x))
80 #define le64atoh(x) le64toh(*(uint64_t*)(x))
81 
82 #define htobe16a(a,x) *(uint16_t*)(a) = htobe16(x)
83 #define htobe32a(a,x) *(uint32_t*)(a) = htobe32(x)
84 #define htobe64a(a,x) *(uint64_t*)(a) = htobe64(x)
85 #define htole16a(a,x) *(uint16_t*)(a) = htole16(x)
86 #define htole32a(a,x) *(uint32_t*)(a) = htole32(x)
87 #define htole64a(a,x) *(uint64_t*)(a) = htole64(x)
88 
89 #endif /*__BYTEORDER_H*/