81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
// Copyright (c) 2023, 2024, Oracle and/or its affiliates.
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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 2.0,
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// as published by the Free Software Foundation.
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//
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// This program is designed to work with certain software (including
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// but not limited to OpenSSL) that is licensed under separate terms,
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// as designated in a particular file or component or in included license
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// documentation. The authors of MySQL hereby grant you an additional
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// permission to link the program and your derivative works with the
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// separately licensed software that they have either included with
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// the program or referenced in the documentation.
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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, version 2.0, 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; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef MYSQL_SERIALIZATION_BYTE_ORDER_HELPERS_H
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#define MYSQL_SERIALIZATION_BYTE_ORDER_HELPERS_H
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#include <bitset>
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#include <sstream>
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#include <vector>
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#include "my_byteorder.h"
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#ifdef HAVE_ENDIAN_CONVERSION_MACROS
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#include <endian.h>
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#endif
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/// @file
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/// Experimental API header
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/// Conversions between different number representations. MySQL writes
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/// binary data in LE, therefore this header defines the following conversions:
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/// host -> LE (for writing)
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/// LE -> host (for reading)
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#if !defined(le64toh)
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/**
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Converting a 64 bit integer from little-endian byte order to host byteorder
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@param x 64-bit integer in little endian byte order
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@return 64-bit integer in host byte order
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*/
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uint64_t inline le64toh(uint64_t x) {
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#ifndef WORDS_BIGENDIAN
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return x;
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#else
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x = ((x << 8) & 0xff00ff00ff00ff00ULL) | ((x >> 8) & 0x00ff00ff00ff00ffULL);
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x = ((x << 16) & 0xffff0000ffff0000ULL) | ((x >> 16) & 0x0000ffff0000ffffULL);
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return (x << 32) | (x >> 32);
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#endif
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}
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#endif
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#if !defined(htole64)
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/**
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Converting a 64 bit integer from host's byte order to little-endian byte
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order.
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@param x 64-bit integer in host's byte order
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@return 64-bit integer in little endian byte order
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*/
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uint64_t inline htole64(uint64_t x) {
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#ifndef WORDS_BIGENDIAN
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return x;
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#else
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x = ((x << 8) & 0xff00ff00ff00ff00ULL) | ((x >> 8) & 0x00ff00ff00ff00ffULL);
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x = ((x << 16) & 0xffff0000ffff0000ULL) | ((x >> 16) & 0x0000ffff0000ffffULL);
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return (x << 32) | (x >> 32);
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#endif
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}
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#endif
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#endif // MYSQL_SERIALIZATION_BYTE_ORDER_HELPERS_H
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