+#define SWAB64(x) ((uint64_t)( \
+ (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
+ (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
+ (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
+ (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
+ (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
+ (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
+ (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
+ (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#endif
+
+#if CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN
+#define cpu_to_le16(x) ((uint16_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
+#define cpu_to_le32(x) ((uint32_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
+#define cpu_to_le64(x) ((uint64_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#define cpu_to_be16(x) SWAB16(x)
+#define cpu_to_be32(x) SWAB32(x)
+#define cpu_to_be64(x) SWAB64(x)
+#elif CPU_BYTE_ORDER == CPU_BIG_ENDIAN
+#define cpu_to_le16(x) SWAB16(x)
+#define cpu_to_le32(x) SWAB32(x)
+#define cpu_to_le64(x) SWAB64(x)
+#define cpu_to_be16(x) ((uint16_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
+#define cpu_to_be32(x) ((uint32_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
+#define cpu_to_be64(x) ((uint64_t)(x + \
+ STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
+#else
+#error "unrecognized CPU endianness"
+#endif
+
+#define be16_to_cpu(x) cpu_to_be16(x)
+#define le16_to_cpu(x) cpu_to_le16(x)
+#define be32_to_cpu(x) cpu_to_be32(x)
+#define le32_to_cpu(x) cpu_to_le32(x)
+#define be64_to_cpu(x) cpu_to_be64(x)
+#define le64_to_cpu(x) cpu_to_le64(x)
+
+#define host_to_net16(x) cpu_to_be16(x)
+#define net_to_host16(x) be16_to_cpu(x)
+#define host_to_net32(x) cpu_to_be32(x)
+#define net_to_host32(x) be32_to_cpu(x)
+#define host_to_net64(x) cpu_to_be64(x)
+#define net_to_host64(x) be64_to_cpu(x)