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 #include "libmemcached/byteorder.h"
  18
  19 /* Byte swap a 64-bit number. */
  20 #ifndef swap64
  21 #  ifndef HAVE_HTONLL
  22 static inline uint64_t swap64(uint64_t in) {
  23 #    if !WORDS_BIGENDIAN
  24   /* Little endian, flip the bytes around until someone makes a faster/better
  25    * way to do this. */
  26   uint64_t rv = 0;
  27   for (uint8_t x = 0; x < 8; ++x) {
  28     rv = (rv << 8) | (in & 0xff);
  29     in >>= 8;
  30   }
  31   return rv;
  32 #    else
  33   /* big-endian machines don't need byte swapping */
  34   return in;
  35 #    endif // WORDS_BIGENDIAN
  36 }
  37 #  endif
  38 #endif
  39
  40 #include <sys/types.h>
  41
  42 uint64_t memcached_ntohll(uint64_t value) {
  43 #ifdef HAVE_HTONLL
  44   return ntohll(value);
  45 #else
  46   return swap64(value);
  47 #endif
  48 }
  49
  50 uint64_t memcached_htonll(uint64_t value) {
  51 #ifdef HAVE_HTONLL
  52   return htonll(value);
  53 #else
  54   return swap64(value);
  55 #endif
  56 }