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79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
// Copyright 2022 Dietrich Epp.
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// This file is part of SyncFiles. SyncFiles is licensed under the terms of the
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// Mozilla Public License, version 2.0. See LICENSE.txt for details.
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#ifndef LIB_ENDIAN_H
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#define LIB_ENDIAN_H
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/* endian.h - byte order and byte swapping */
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/*
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Defines macros for swapping to and from big-endian:
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EndianU16_BtoN
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EndianU16_NtoB
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EndianU32_BtoN
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EndianU32_NtoB
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*/
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#include "lib/defs.h"
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#if TARGET_API_MAC_OS8
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/* Use the legacy Mac OS header, if available. */
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#include <Endian.h>
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#else
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/* Use the compiler built-in, if available. */
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#if __clang__
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#if __has_builtin(__builtin_bswap16)
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#define Endian16_Swap(x) __builtin_bswap16(x)
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#endif
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#if __has_builtin(__builtin_bswap32)
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#define Endian32_Swap(x) __builtin_bswap32(x)
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#endif
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#elif __GNUC__
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#if __GNUC__ && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 3)
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#define Endian16_Swap(x) __builtin_bswap16(x)
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#define Endian32_Swap(x) __builtin_bswap32(x)
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#endif
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#endif
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/* Fallback implementations. */
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/* clang-format off */
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#ifndef Endian16_Swap
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#define Endian16_Swap(x) \
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((((UInt16)(x) << 8) & 0xff00) | \
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(((UInt16)(x) >> 8) & 0x00ff))
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#endif
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#ifndef Endian32_Swap
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#define Endian32_Swap(x) \
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((((UInt32)(x) << 24) & 0xff000000) | \
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(((UInt32)(x) << 8) & 0x00ff0000) | \
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(((UInt32)(x) >> 8) & 0x0000ff00) | \
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(((UInt32)(x) >> 24) & 0x000000ff))
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#endif
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/* clang-format on */
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#if TARGET_RT_BIG_ENDIAN
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#define EndianU16_BtoN(x) (x)
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#define EndianU16_NtoB(x) (x)
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#define EndianU32_BtoN(x) (x)
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#define EndianU32_NtoB(x) (x)
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#else
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#define EndianU16_BtoN(x) Endian16_Swap(x)
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#define EndianU16_NtoB(x) Endian16_Swap(x)
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#define EndianU32_BtoN(x) Endian32_Swap(x)
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#define EndianU32_NtoB(x) Endian32_Swap(x)
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#endif
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#endif /* TARGET_API_MAC_OS8 */
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#endif
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