xref: /isa-l_crypto/include/endian_helper.h (revision 1de5344d2e55af6b245565bde0dec2868130cf14)

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#ifndef _ENDIAN_HELPER_H_
#define _ENDIAN_HELPER_H_

/**
 *  @file  endian_helper.h
 *  @brief Byte order helper routines
 *
 */

#ifdef __cplusplus
extern "C" {
#endif

#if defined(__ICC)
#define byteswap32(x) _bswap(x)
#define byteswap64(x) _bswap64(x)
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
#define byteswap32(x) __builtin_bswap32(x)
#define byteswap64(x) __builtin_bswap64(x)
#else
#define byteswap32(x) (((x) << 24) | (((x) & 0xff00) << 8) | (((x) & 0xff0000) >> 8) | ((x) >> 24))
#define byteswap64(x)                                                                              \
        ((((x) & (0xffull << 0)) << 56) | (((x) & (0xffull << 8)) << 40) |                         \
         (((x) & (0xffull << 16)) << 24) | (((x) & (0xffull << 24)) << 8) |                        \
         (((x) & (0xffull << 32)) >> 8) | (((x) & (0xffull << 40)) >> 24) |                        \
         (((x) & (0xffull << 48)) >> 40) | (((x) & (0xffull << 56)) >> 56))
#endif

// This check works when using GCC (or LLVM).  Assume little-endian
// if any other compiler is being used.
#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) &&                                    \
        __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define to_le32(x) byteswap32(x)
#define to_le64(x) byteswap64(x)
#define to_be32(x) (x)
#define to_be64(x) (x)
#else
#define to_le32(x) (x)
#define to_le64(x) (x)
#define to_be32(x) byteswap32(x)
#define to_be64(x) byteswap64(x)
#endif

#ifdef __cplusplus
}
#endif

#endif // _ISA_HELPER_H_