mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2016 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// 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
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_COMMON_ENDIAN_H
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#define OPENVPN_COMMON_ENDIAN_H
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#include <openvpn/common/size.hpp>
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// test for machine endiannes
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#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && defined(__ORDER_LITTLE_ENDIAN__)
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define OPENVPN_BIG_ENDIAN
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#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define OPENVPN_LITTLE_ENDIAN
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#endif
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#elif defined(_WIN32)
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#define OPENVPN_LITTLE_ENDIAN // assume that Windows is always little-endian
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#endif
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namespace openvpn {
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namespace Endian {
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# ifdef OPENVPN_LITTLE_ENDIAN
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inline size_t e16(const size_t v)
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{
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return v;
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}
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inline size_t e16rev(const size_t v)
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{
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return 15-v;
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}
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inline size_t e4(const size_t v)
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{
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return v;
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}
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inline size_t e4rev(const size_t v)
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{
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return 3-v;
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}
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inline size_t e2(const size_t v)
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{
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return v;
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}
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inline size_t e2rev(const size_t v)
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{
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return 1-v;
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}
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# elif OPENVPN_BIG_ENDIAN
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inline size_t e16rev(const size_t v)
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{
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return v;
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}
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inline size_t e16(const size_t v)
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{
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return 15-v;
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}
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inline size_t e4rev(const size_t v)
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{
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return v;
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}
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inline size_t e4(const size_t v)
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{
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return 3-v;
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}
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inline size_t e2rev(const size_t v)
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{
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return v;
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}
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inline size_t e2(const size_t v)
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{
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return 1-v;
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}
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# else
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# error One of OPENVPN_LITTLE_ENDIAN or OPENVPN_BIG_ENDIAN must be defined
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# endif
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}
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} // namespace openvpn
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#endif // OPENVPN_COMMON_ENDIAN_H
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