133 lines
2.3 KiB
C
133 lines
2.3 KiB
C
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file sys/endian.h
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*
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* Architecture specific byteswap utilities.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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#ifndef DF_SYS_ENDIAN_H_
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#define DF_SYS_ENDIAN_H_
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#include "xpt.h"
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#ifdef _MSC_VER
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#include <stdlib.h> // _byteswap_*()
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#endif
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/// Helper `union` to access bit representation of `float`.
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typedef union {
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float f32;
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Uint32 bits;
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} Floatbits;
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/// Helper `union` to access bit representation of `double`.
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typedef union {
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double f64;
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Uint64 bits;
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} Doublebits;
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STATIC_ASSERT(sizeof(Floatbits) == sizeof(Uint32), "float vs Uint32 size mismatch");
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STATIC_ASSERT(sizeof(Doublebits) == sizeof(Uint64), "double vs Uint64 size mismatch");
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/// Swap bytes inside 16-bits word.
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FORCE_INLINE Uint16 bswap16(Uint16 x)
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{
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#ifdef _MSC_VER
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return _byteswap_ushort(x);
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#elif defined(__GNUC__)
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return __builtin_bswap16(x);
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#else
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return BSWAP16(x);
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#endif
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}
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/// Swap bytes inside 32-bits dword.
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FORCE_INLINE Uint32 bswap32(Uint32 x)
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{
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#ifdef _MSC_VER
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return _byteswap_ulong(x);
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#elif defined(__GNUC__)
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return __builtin_bswap32(x);
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#else
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return BSWAP32(x);
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#endif
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}
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/// Swap bytes inside 64-bits quadword.
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FORCE_INLINE Uint64 bswap64(Uint64 x)
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{
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#ifdef _MSC_VER
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return _byteswap_uint64(x);
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#elif defined(__GNUC__)
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return __builtin_bswap64(x);
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#else
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return BSWAP64(x);
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#endif
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}
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/// `bswap16()` if target isn't little-endian.
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FORCE_INLINE Uint16 leswap16(Uint16 x)
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{
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#if EDN_NATIVE == EDN_LE
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return x;
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#else
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return bswap16(x);
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#endif
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}
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/// `bswap16()` if target isn't big-endian.
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FORCE_INLINE Uint16 beswap16(Uint16 x)
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{
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#if EDN_NATIVE == EDN_BE
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return x;
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#else
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return bswap16(x);
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#endif
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}
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/// `bswap32()` if target isn't little-endian.
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FORCE_INLINE Uint32 leswap32(Uint32 x)
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{
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#if EDN_NATIVE == EDN_LE
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return x;
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#else
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return bswap32(x);
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#endif
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}
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/// `bswap32()` if target isn't big-endian.
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FORCE_INLINE Uint32 beswap32(Uint32 x)
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{
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#if EDN_NATIVE == EDN_BE
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return x;
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#else
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return bswap32(x);
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#endif
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}
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/// `bswap64()` if target isn't little-endian.
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FORCE_INLINE Uint64 leswap64(Uint64 x)
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{
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#if EDN_NATIVE == EDN_LE
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return x;
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#else
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return bswap64(x);
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#endif
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}
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/// `bswap64()` if target isn't big-endian.
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FORCE_INLINE Uint64 beswap64(Uint64 x)
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{
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#if EDN_NATIVE == EDN_BE
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return x;
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#else
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return bswap64(x);
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#endif
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}
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#endif
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