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

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "mem_config.h"
  17
  18 #if HAVE_HTONLL && HAVE_ARPA_INET_H
  19 #  include <arpa/inet.h>
  20 #endif
  21
  22 #include "libmemcached/byteorder.h"
  23
  24 /* Byte swap a 64-bit number. */
  25 #ifndef swap64
  26 #  ifndef HAVE_HTONLL
  27 static inline uint64_t swap64(uint64_t in) {
  28 #    if !WORDS_BIGENDIAN
  29   /* Little endian, flip the bytes around until someone makes a faster/better
  30    * way to do this. */
  31   uint64_t rv = 0;
  32   for (uint8_t x = 0; x < 8; ++x) {
  33     rv = (rv << 8) | (in & 0xff);
  34     in >>= 8;
  35   }
  36   return rv;
  37 #    else
  38   /* big-endian machines don't need byte swapping */
  39   return in;
  40 #    endif // WORDS_BIGENDIAN
  41 }
  42 #  endif
  43 #endif
  44
  45 #include <sys/types.h>
  46
  47 uint64_t memcached_ntohll(uint64_t value) {
  48 #ifdef HAVE_HTONLL
  49   return ntohll(value);
  50 #else
  51   return swap64(value);
  52 #endif
  53 }
  54
  55 uint64_t memcached_htonll(uint64_t value) {
  56 #ifdef HAVE_HTONLL
  57   return htonll(value);
  58 #else
  59   return swap64(value);
  60 #endif
  61 }