lib/ntlmauth/support_endian.h

   1 /*
   2  * Copyright (C) 1996-2015 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