go-ethereum/vendor/github.com/ethereum/ethash/src/libethash/endian.h

#pragma once

#include <stdint.h>
#include "compiler.h"

#if defined(__MINGW32__) || defined(_WIN32)
  # define LITTLE_ENDIAN 1234
  # define BYTE_ORDER    LITTLE_ENDIAN
#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
  # include <sys/endian.h>
#elif defined(__OpenBSD__) || defined(__SVR4)
  # include <sys/types.h>
#elif defined(__APPLE__)
# include <machine/endian.h>
#elif defined( BSD ) && (BSD >= 199103)
  # include <machine/endian.h>
#elif defined( __QNXNTO__ ) && defined( __LITTLEENDIAN__ )
  # define LITTLE_ENDIAN 1234
  # define BYTE_ORDER    LITTLE_ENDIAN
#elif defined( __QNXNTO__ ) && defined( __BIGENDIAN__ )
  # define BIG_ENDIAN 1234
  # define BYTE_ORDER BIG_ENDIAN
#else
# include <endian.h>
#endif

#if defined(_WIN32)
#include <stdlib.h>
#define ethash_swap_u32(input_) _byteswap_ulong(input_)
#define ethash_swap_u64(input_) _byteswap_uint64(input_)
#elif defined(__APPLE__)
#include <libkern/OSByteOrder.h>
#define ethash_swap_u32(input_) OSSwapInt32(input_)
#define ethash_swap_u64(input_) OSSwapInt64(input_)
#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
#define ethash_swap_u32(input_) bswap32(input_)
#define ethash_swap_u64(input_) bswap64(input_)
#elif defined(__OpenBSD__)
#include <endian.h>
#define ethash_swap_u32(input_) swap32(input_)
#define ethash_swap_u64(input_) swap64(input_)
#else // posix
#include <byteswap.h>
#define ethash_swap_u32(input_) bswap_32(input_)
#define ethash_swap_u64(input_) bswap_64(input_)
#endif


#if LITTLE_ENDIAN == BYTE_ORDER

#define fix_endian32(dst_ ,src_) dst_ = src_
#define fix_endian32_same(val_)
#define fix_endian64(dst_, src_) dst_ = src_
#define fix_endian64_same(val_)
#define fix_endian_arr32(arr_, size_)
#define fix_endian_arr64(arr_, size_)

#elif BIG_ENDIAN == BYTE_ORDER

#define fix_endian32(dst_, src_) dst_ = ethash_swap_u32(src_)
#define fix_endian32_same(val_) val_ = ethash_swap_u32(val_)
#define fix_endian64(dst_, src_) dst_ = ethash_swap_u64(src_)
#define fix_endian64_same(val_) val_ = ethash_swap_u64(val_)
#define fix_endian_arr32(arr_, size_) \
  do { \
    for (unsigned i_ = 0; i_ < (size_); ++i_) { \
      arr_[i_] = ethash_swap_u32(arr_[i_]); \
    } \
  } while (0)
#define fix_endian_arr64(arr_, size_) \
  do { \
    for (unsigned i_ = 0; i_ < (size_); ++i_) { \
      arr_[i_] = ethash_swap_u64(arr_[i_]); \
    } \
  } while (0)
#else
# error "endian not supported"
#endif // BYTE_ORDER