git.m6w6.name Git - m6w6/libmemcached/blob - src/libmemcached/byteorder.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include "mem_config.h"
  39 #include "libmemcached/byteorder.h"
  40
  41 /* Byte swap a 64-bit number. */
  42 #ifndef swap64
  43 # ifndef HAVE_HTONLL
  44 static inline uint64_t swap64(uint64_t in)
  45 {
  46 #if !WORDS_BIGENDIAN
  47   /* Little endian, flip the bytes around until someone makes a faster/better
  48    * way to do this. */
  49   uint64_t rv= 0;
  50   for (uint8_t x= 0; x < 8; ++x)
  51   {
  52     rv= (rv << 8) | (in & 0xff);
  53     in >>= 8;
  54   }
  55   return rv;
  56 #else
  57   /* big-endian machines don't need byte swapping */
  58   return in;
  59 #endif // WORDS_BIGENDIAN
  60 }
  61 # endif
  62 #endif
  63
  64 #ifdef HAVE_SYS_TYPES_H
  65 # include <sys/types.h>
  66 #endif
  67
  68 uint64_t memcached_ntohll(uint64_t value)
  69 {
  70 #ifdef HAVE_HTONLL
  71   return ntohll(value);
  72 #else
  73   return swap64(value);
  74 #endif
  75 }
  76
  77 uint64_t memcached_htonll(uint64_t value)
  78 {
  79 #ifdef HAVE_HTONLL
  80   return htonll(value);
  81 #else
  82   return swap64(value);
  83 #endif
  84 }