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86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
// DR. ROBOTNIK'S RING RACERS
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//-----------------------------------------------------------------------------
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// Copyright (C) 2025 by Kart Krew.
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// Copyright (C) 2020 by Sonic Team Junior.
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// Copyright (C) 2000 by DooM Legacy Team.
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// Copyright (C) 1996 by id Software, Inc.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file m_swap.h
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/// \brief Endianess handling, swapping 16bit and 32bit
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#ifndef __M_SWAP__
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#define __M_SWAP__
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#include "endian.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SWAP_SHORT(x) ((INT16)(\
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(((UINT16)(x) & (UINT16)0x00ffU) << 8) \
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| \
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(((UINT16)(x) & (UINT16)0xff00U) >> 8))) \
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#define SWAP_LONG(x) ((INT32)(\
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(((UINT32)(x) & (UINT32)0x000000ffUL) << 24) \
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| \
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(((UINT32)(x) & (UINT32)0x0000ff00UL) << 8) \
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| \
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(((UINT32)(x) & (UINT32)0x00ff0000UL) >> 8) \
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| \
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(((UINT32)(x) & (UINT32)0xff000000UL) >> 24)))
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#define SWAP_LONGLONG(x) ((INT64)(\
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(((UINT64)(x) & (UINT64)0x00000000000000ffULL) << 56) \
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| \
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(((UINT64)(x) & (UINT64)0x000000000000ff00ULL) << 40) \
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| \
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(((UINT64)(x) & (UINT64)0x0000000000ff0000ULL) << 24) \
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| \
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(((UINT64)(x) & (UINT64)0x00000000ff000000ULL) << 8) \
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| \
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(((UINT64)(x) & (UINT64)0x000000ff00000000ULL) >> 8) \
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| \
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(((UINT64)(x) & (UINT64)0x0000ff0000000000ULL) >> 24) \
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| \
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(((UINT64)(x) & (UINT64)0x00ff000000000000ULL) >> 40) \
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(((UINT64)(x) & (UINT64)0xff00000000000000ULL) >> 56)))
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// Endianess handling.
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// WAD files are stored little endian.
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#ifdef SRB2_BIG_ENDIAN
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#define SHORT SWAP_SHORT
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#define LONG SWAP_LONG
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#define LONGLON SWAP_LONGLONG
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#define MSBF_SHORT(x) ((INT16)(x))
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#define MSBF_LONG(x) ((INT32)(x))
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#define MSBF_LONGLONG(x) ((INT64)(x))
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#else
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#define SHORT(x) ((INT16)(x))
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#define LONG(x) ((INT32)(x))
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#define LONGLONG(x) ((INT64)(x))
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#define MSBF_SHORT SWAP_SHORT
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#define MSBF_LONG SWAP_LONG
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#define MSBF_LONGLONG SWAP_LONGLONG
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#endif
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// Big to little endian
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#ifdef SRB2_LITTLE_ENDIAN
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#define BIGENDIAN_LONG(x) ((INT32)(((x)>>24)&0xff)|(((x)<<8)&0xff0000)|(((x)>>8)&0xff00)|(((x)<<24)&0xff000000))
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#define BIGENDIAN_SHORT(x) ((INT16)(((x)>>8)|((x)<<8)))
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#else
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#define BIGENDIAN_LONG(x) ((INT32)(x))
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#define BIGENDIAN_SHORT(x) ((INT16)(x))
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#endif
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif
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