gp_get_set_bytes.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2025 Cyril Hrubis <metan@ucw.cz>
 */
 
#ifndef CORE_GP_GET_SET_BYTES_H
#define CORE_GP_GET_SET_BYTES_H
 
#include <core/gp_byte_order.h>
 
#define GP_SWAP_BYTES2(v) (   \
        (((v) & 0xff00)>>8) | \
        (((v) & 0x00ff)<<8)   \
)
 
#define GP_SWAP_BYTES3(v) (      \
         ((v) & 0x00ff00)      | \
        (((v) & 0x0000ff)<<16) | \
        (((v) & 0xff0000)>>16)   \
)
 
#define GP_SWAP_BYTES4(v) (        \
        (((v) & 0xff000000)>>24) | \
        (((v) & 0x00ff0000)>>8)  | \
        (((v) & 0x0000ff00)<<8)  | \
        (((v) & 0x000000ff)<<24)   \
)
 
#define GP_GET_BYTES1(src) (*((uint8_t *)(src)))
 
#define GP_SET_BYTES1(dst, byte) *((uint8_t *)(dst)) = (byte)
 
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define GP_GET_BYTES2_LE(src) (*((uint16_t *)(src)))
#else
# define GP_GET_BYTES2_LE(src) GP_SWAP_BYTES2(*((uint16_t *)(src)))
#endif
 
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define GP_SET_BYTES2_LE(dst, bytes) *((uint16_t *)(dst)) = (bytes)
#else
# define GP_SET_BYTES2_LE(dst, bytes) *((uint16_t *)(dst)) = GP_SWAP_BYTES2(bytes)
#endif
 
#if __BYTE_ORDER == __BIG_ENDIAN
# define GP_GET_BYTES2_BE(src) (*((uint16_t *)(src)))
#else
# define GP_GET_BYTES2_BE(src) GP_SWAP_BYTES2(*((uint16_t *)(src)))
#endif
 
#if __BYTE_ORDER == __BIG_ENDIAN
# define GP_SET_BYTES2_BE(dst, bytes) *((uint16_t *)(dst)) = (bytes)
#else
# define GP_SET_BYTES2_BE(dst, bytes) *((uint16_t *)(dst)) = GP_SWAP_BYTES2(bytes)
#endif
 
#if __BYTE_ORDER == __BIG_ENDIAN
# define GP_GET_BYTES4_BE(src) *((uint32_t *)src)
#else
# define GP_GET_BYTES4_BE(src) GP_SWAP_BYTES4(*((uint16_t *)(src)))
#endif
 
#if __BYTE_ORDER == __BIG_ENDIAN
# define GP_SET_BYTES4_BE(dst, bytes) *((uint32_t *)(dst)) = (bytes)
#else
# define GP_SET_BYTES4_BE(dst, bytes) *((uint32_t *)(dst)) = GP_SWAP_BYTES4(bytes)
#endif
 
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define GP_GET_BYTES4_LE(src) *((uint32_t *)src)
#else
# define GP_GET_BYTES4_LE(src) GP_SWAP_BYTES4(*((uint16_t *)(src)))
#endif
 
#if __BYTE_ORDER == __LITTLE_ENDIAN
# define GP_SET_BYTES4_LE(dst, bytes) *((uint32_t *)(dst)) = (bytes)
#else
# define GP_SET_BYTES4_LE(dst, bytes) *((uint32_t *)(dst)) = GP_SWAP_BYTES4(bytes)
#endif
 
#endif /* CORE_GP_GET_SET_BYTES_H */