support_endian.h
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1 /*
2  * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #ifndef SQUID_LIB_NTLMAUTH_SUPPORT_ENDIAN_H
10 #define SQUID_LIB_NTLMAUTH_SUPPORT_ENDIAN_H
11 
12 #if HAVE_BYTESWAP_H
13 #include <byteswap.h>
14 #endif
15 #if HAVE_MACHINE_BYTE_SWAP_H
16 #include <machine/byte_swap.h>
17 #endif
18 #if HAVE_SYS_BSWAP_H
19 #include <sys/bswap.h>
20 #endif
21 #if HAVE_ENDIAN_H
22 #include <endian.h>
23 #endif
24 #if HAVE_SYS_ENDIAN_H
25 #include <sys/endian.h>
26 #endif
27 
28 /*
29  * Macros to deal with byte swapping. These macros provide
30  * the following interface:
31  *
32  * // Byte-swap
33  * uint16_t bswap16(uint16_t);
34  * uint32_t bswap32(uint32_t);
35  *
36  * // Convert from host byte order to little-endian, and vice versa.
37  * uint16_t htole16(uint16_t);
38  * uint32_t htole32(uint32_t);
39  * uint16_t le16toh(uint16_t);
40  * uint32_t le32toh(uint32_t);
41  *
42  * XXX: What about unusual byte orders like 3412 or 2143 ?
43  * Never had any problems reported, so we dont worry about them.
44  */
45 
46 #if !HAVE_HTOLE16 && !defined(htole16)
47 /* Define bswap16() in terms of bswap_16() or the hard way. */
48 #if !HAVE_BSWAP16 && !defined(bswap16)
49 # if HAVE_BSWAP_16 || defined(bswap_16)
50 # define bswap16(x) bswap_16(x)
51 # else // 'hard way'
52 # define bswap16(x) \
53  (((((uint16_t)(x)) >> 8) & 0xff) | ((((uint16_t)(x)) & 0xff) << 8))
54 # endif
55 #endif
56 
57 /* Define htole16() in terms of bswap16(). */
58 # if defined(WORDS_BIGENDIAN)
59 # define htole16(x) bswap16(x)
60 # else
61 # define htole16(x) (x)
62 # endif
63 #endif
64 
65 #if !HAVE_HTOLE32 && !defined(htole32)
66 #if ! HAVE_BSWAP32 && ! defined(bswap32)
67 /* Define bswap32() in terms of bswap_32() or the hard way. */
68 # if HAVE_BSWAP_32 || defined(bswap_32)
69 # define bswap32(x) bswap_32(x)
70 # else // 'hard way'
71 # define bswap32(x) \
72  (((((uint32_t)(x)) & 0xff000000) >> 24) | \
73  ((((uint32_t)(x)) & 0x00ff0000) >> 8) | \
74  ((((uint32_t)(x)) & 0x0000ff00) << 8) | \
75  ((((uint32_t)(x)) & 0x000000ff) << 24))
76 # endif
77 
78 /* Define htole32() in terms of bswap32(). */
79 #endif
80 # if defined(WORDS_BIGENDIAN)
81 # define htole32(x) bswap32(x)
82 # else
83 # define htole32(x) (x)
84 # endif
85 #endif
86 
87 /* Define letoh*() in terms of htole*(). The swap is symmetrical. */
88 #if !HAVE_LE16TOH && !defined(le16toh)
89 #define le16toh(x) htole16(x)
90 #endif
91 #if !HAVE_LE32TOH && !defined(le32toh)
92 #define le32toh(x) htole32(x)
93 #endif
94 
95 #endif /* SQUID_LIB_NTLMAUTH_SUPPORT_ENDIAN_H */
96 

 

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