thin-provisioning-tools/base/endian_utils.cc

65 lines
1.7 KiB
C++
Raw Normal View History

2011-12-16 00:04:31 +05:30
// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
2011-12-06 19:23:05 +05:30
//
2011-12-06 19:13:56 +05:30
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
2011-08-22 15:12:13 +05:30
#include "endian_utils.h"
2011-07-22 20:39:56 +05:30
using namespace base;
//----------------------------------------------------------------
bool
base::test_bit_le(void const *bits, unsigned b)
{
2013-03-22 20:06:31 +05:30
le64 const *w = reinterpret_cast<le64 const *>(bits);
2011-07-22 20:39:56 +05:30
w += b / 64;
uint64_t v = to_cpu<uint64_t>(*w);
uint64_t mask = 1;
mask = mask << (b % 64);
return (v & mask) ? true : false;
}
void
base::set_bit_le(void *bits, unsigned b)
{
2013-03-22 20:06:31 +05:30
le64 *w = reinterpret_cast<le64 *>(bits);
2011-07-22 20:39:56 +05:30
w += b / 64;
uint64_t v = to_cpu<uint64_t>(*w);
uint64_t mask = 1;
mask = mask << (b % 64);
v |= mask;
2013-03-22 20:06:31 +05:30
*w = to_disk<le64>(v);
2011-07-22 20:39:56 +05:30
}
void
base::clear_bit_le(void *bits, unsigned b)
{
2013-03-22 20:06:31 +05:30
le64 *w = reinterpret_cast<le64 *>(bits);
2011-07-22 20:39:56 +05:30
w += b / 64;
uint64_t v = to_cpu<uint64_t>(*w);
uint64_t mask = 1;
mask = mask << (b % 64);
mask = ~mask;
v &= mask;
2013-03-22 20:06:31 +05:30
*w = to_disk<le64>(v);
2011-07-22 20:39:56 +05:30
}
//----------------------------------------------------------------