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