122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
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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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This program is also distributed 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 included with MySQL.
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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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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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/**
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@file libbinlogevents/include/byteorder.h
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@brief The file contains functions to convert the byte encoding of integer
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values to and from little-endian and big-endian byte order.
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*/
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#ifndef BYTEORDER_INCLUDED
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#define BYTEORDER_INCLUDED
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#include <stdint.h>
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#include "binlog_config.h"
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#include "my_compiler.h"
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#ifndef STANDALONE_BINLOG
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#define HAVE_MYSYS 1
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#endif
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/*
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Methods for reading and storing in machine independent
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format (low byte first).
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*/
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/*
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Checking le16toh is required because the machine may have the header
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but the functions might not be defined if the version of glibc < 2.9
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*/
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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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#if !defined(le16toh)
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/**
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Converting a 16 bit integer from little-endian byte order to host byteorder
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@param x 16-bit integer in little endian byte order
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@return 16-bit integer in host byte order
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*/
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uint16_t inline le16toh(uint16_t x) {
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#ifndef IS_BIG_ENDIAN
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return x;
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#else
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return ((x >> 8) | (x << 8));
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#endif
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}
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#endif
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#if !defined(le32toh)
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/**
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Converting a 32 bit integer from little-endian byte order to host byteorder
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@param x 32-bit integer in little endian byte order
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@return 32-bit integer in host byte order
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*/
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uint32_t inline le32toh(uint32_t x) {
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#ifndef IS_BIG_ENDIAN
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return x;
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#else
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return (((x >> 24) & 0xff) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) |
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((x << 24) & 0xff000000));
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#endif
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}
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#endif
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#if !defined(be32toh)
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/**
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Converting a 32 bit integer from big-endian byte order to host byteorder
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@param x 32-bit integer in big endian byte order
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@return 32-bit integer in host byte order
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*/
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uint32_t inline be32toh(uint32_t x) {
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#ifndef IS_BIG_ENDIAN
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return (((x >> 24) & 0xff) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) |
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((x << 24) & 0xff000000));
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#else
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return x;
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#endif
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}
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#endif
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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 IS_BIG_ENDIAN
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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 // BYTEORDER_INCLUDED
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