67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
// Copyright (c) 2014-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_COMPAT_BYTESWAP_H
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#define BITCOIN_COMPAT_BYTESWAP_H
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#if defined(HAVE_CONFIG_H)
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#include "config/bitcoin-config.h"
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#endif
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#include <stdint.h>
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#if defined(HAVE_BYTESWAP_H)
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#include <byteswap.h>
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#endif
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#if defined(__APPLE__)
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#if !defined(bswap_16)
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// Mac OS X / Darwin features; we include a check for bswap_16 because if it is already defined, protobuf has
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// defined these macros for us already; if it isn't, we do it ourselves. In either case, we get the exact same
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// result regardless which path was taken
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#include <libkern/OSByteOrder.h>
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#define bswap_16(x) OSSwapInt16(x)
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#define bswap_32(x) OSSwapInt32(x)
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#define bswap_64(x) OSSwapInt64(x)
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#endif // !defined(bswap_16)
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#else
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// Non-Mac OS X / non-Darwin
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#if HAVE_DECL_BSWAP_16 == 0
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inline uint16_t bswap_16(uint16_t x)
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{
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return (x >> 8) | ((x & 0x00ff) << 8);
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}
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#endif // HAVE_DECL_BSWAP16
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#if HAVE_DECL_BSWAP_32 == 0
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inline uint32_t bswap_32(uint32_t x)
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{
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return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >> 8) |
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((x & 0x0000ff00U) << 8) | ((x & 0x000000ffU) << 24));
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}
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#endif // HAVE_DECL_BSWAP32
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#if HAVE_DECL_BSWAP_64 == 0
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inline uint64_t bswap_64(uint64_t x)
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{
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return (((x & 0xff00000000000000ull) >> 56)
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| ((x & 0x00ff000000000000ull) >> 40)
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| ((x & 0x0000ff0000000000ull) >> 24)
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| ((x & 0x000000ff00000000ull) >> 8)
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| ((x & 0x00000000ff000000ull) << 8)
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| ((x & 0x0000000000ff0000ull) << 24)
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| ((x & 0x000000000000ff00ull) << 40)
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| ((x & 0x00000000000000ffull) << 56));
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}
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#endif // HAVE_DECL_BSWAP64
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#endif // defined(__APPLE__)
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#endif // BITCOIN_COMPAT_BYTESWAP_H
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