96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
// SPDX-License-Identifier: AGPL-1.0-only
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// Copyright (C) 2018 Ludvig Strigeus <info@tunsafe.com>. All Rights Reserved.
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#ifndef TINYVPN_ENDIAN_H_
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#define TINYVPN_ENDIAN_H_
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#include "build_config.h"
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#include "tunsafe_types.h"
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#if defined(OS_WIN) && defined(COMPILER_MSVC)
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#include <intrin.h>
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#endif
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#include <stdint.h>
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#define ByteSwap32Fallback(x) ( \
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(((uint32)(x) & (uint32)0x000000fful) << 24) | \
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(((uint32)(x) & (uint32)0x0000ff00ul) << 8) | \
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(((uint32)(x) & (uint32)0x00ff0000ul) >> 8) | \
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(((uint32)(x) & (uint32)0xff000000ul) >> 24))
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#define ByteSwap16Fallback(x) ((uint16)( \
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(((uint16)(x) & (uint16)0x00ffu) << 8) | \
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(((uint16)(x) & (uint16)0xff00u) >> 8)))
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#define ByteSwap64Fallback(x) ((uint64)ByteSwap32Fallback(x)<<32 | ByteSwap32Fallback(x>>32))
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#define ReadBE32AlignedFallback(pt) (((uint32)((pt)[0] & 0xFF) << 24) ^ \
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((uint32)((pt)[1] & 0xFF) << 16) ^ \
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((uint32)((pt)[2] & 0xFF) << 8) ^ \
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((uint32)((pt)[3] & 0xFF)))
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#define WriteBE32AlignedFallback(ct, st) { \
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(ct)[0] = (char)((st) >> 24); \
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(ct)[1] = (char)((st) >> 16); \
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(ct)[2] = (char)((st) >> 8); \
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(ct)[3] = (char)(st); }
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#if defined(OS_WIN) && defined(COMPILER_MSVC)
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#define ByteSwap16(x) _byteswap_ushort((uint16)x)
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#define ByteSwap32(x) _byteswap_ulong((uint32)x)
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#define ByteSwap64(x) _byteswap_uint64((uint64)x)
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#elif defined(COMPILER_GCC)
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#define ByteSwap16(x) __builtin_bswap16((uint16)x)
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#define ByteSwap32(x) __builtin_bswap32((uint32)x)
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#define ByteSwap64(x) __builtin_bswap64((uint64)x)
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#else
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#define ByteSwap16 ByteSwap16Fallback
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#define ByteSwap32 ByteSwap32Fallback
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#define ByteSwap64 ByteSwap64Fallback
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#endif
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#if defined(ARCH_CPU_LITTLE_ENDIAN)
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#define ToBE64(x) ByteSwap64(x)
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#define ToBE32(x) ByteSwap32(x)
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#define ToBE16(x) ByteSwap16(x)
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#define ToLE64(x) (x)
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#define ToLE32(x) (x)
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#define ToLE16(x) (x)
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#else
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#define ToBE64(x) (x)
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#define ToBE32(x) (x)
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#define ToBE16(x) (x)
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#define ToLE64(x) ByteSwap64(x)
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#define ToLE32(x) ByteSwap32(x)
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#define ToLE16(x) ByteSwap16(x)
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#endif
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#define ReadBE16Aligned(pt) ToBE16(*(uint16*)(pt))
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#define WriteBE16Aligned(ct, st) (*(uint16*)(ct) = ToBE16(st))
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#define ReadBE32Aligned(pt) ToBE32(*(uint32*)(pt))
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#define WriteBE32Aligned(ct, st) (*(uint32*)(ct) = ToBE32(st))
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#define ReadBE16(pt) ToBE16(*(uint16*)(pt))
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#define WriteBE16(ct, st) (*(uint16*)(ct) = ToBE16(st))
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#define ReadBE32(pt) ToBE32(*(uint32*)(pt))
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#define WriteBE32(ct, st) (*(uint32*)(ct) = ToBE32(st))
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#define ReadBE64(pt) ToBE64(*(uint64*)(pt))
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#define WriteBE64(ct, st) (*(uint64*)(ct) = ToBE64(st))
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#define ReadLE16(pt) ToLE16(*(uint16*)(pt))
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#define WriteLE16(ct, st) (*(uint16*)(ct) = ToLE16(st))
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#define ReadLE32(pt) ToLE32(*(uint32*)(pt))
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#define WriteLE32(ct, st) (*(uint32*)(ct) = ToLE32(st))
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#define ReadLE64(pt) ToLE64(*(uint64*)(pt))
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#define WriteLE64(ct, st) (*(uint64*)(ct) = ToLE64(st))
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#define Read16(pt) (*(uint16*)(pt))
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#define Write16(ct, st) (*(uint16*)(ct) = (st))
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#define Read32(pt) (*(uint32*)(pt))
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#define Write32(ct, st) (*(uint32*)(ct) = (st))
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#define Read64(pt) (*(uint64*)(pt))
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#define Write64(ct, st) (*(uint64*)(ct) = (st))
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#endif // TINYVPN_ENDIAN_H_
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