--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/byteswap.h	Fri Feb 15 14:20:08 2019 +0900
@@ -0,0 +1,155 @@
+/* Macros to swap the order of bytes in integer values.
+   Copyright (C) 1997-2012   Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
+#include <features.h>
+#include <bits/types.h>
+#include <bits/wordsize.h>
+
+/* Swap bytes in 16 bit value.  */
+#define __bswap_constant_16(x) \
+     ((unsigned short int) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
+
+/* Get __bswap_16.  */
+#include <bits/byteswap-16.h>
+
+/* Swap bytes in 32 bit value.  */
+#define __bswap_constant_32(x) \
+     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |		      \
+      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
+
+#ifdef __GNUC__
+# if __GNUC_PREREQ (4, 3)
+static __inline unsigned int
+__bswap_32 (unsigned int __bsx)
+{
+  return __builtin_bswap32 (__bsx);
+}
+# elif __GNUC__ >= 2
+#  if __WORDSIZE == 64 || (defined __i486__ || defined __pentium__	      \
+			   || defined __pentiumpro__ || defined __pentium4__  \
+			   || defined __k8__ || defined __athlon__	      \
+			   || defined __k6__ || defined __nocona__	      \
+			   || defined __core2__ || defined __geode__	      \
+			   || defined __amdfam10__)
+/* To swap the bytes in a word the i486 processors and up provide the
+   `bswap' opcode.  On i386 we have to use three instructions.  */
+#   define __bswap_32(x) \
+      (__extension__							      \
+       ({ register unsigned int __v, __x = (x);				      \
+	  if (__builtin_constant_p (__x))				      \
+	    __v = __bswap_constant_32 (__x);				      \
+	  else								      \
+	    __asm__ ("bswap %0" : "=r" (__v) : "0" (__x));		      \
+	  __v; }))
+#  else
+#   define __bswap_32(x)						      \
+      (__extension__							      \
+       ({ register unsigned int __v, __x = (x);				      \
+	  if (__builtin_constant_p (__x))				      \
+	    __v = __bswap_constant_32 (__x);				      \
+	  else								      \
+	    __asm__ ("rorw $8, %w0;"					      \
+		     "rorl $16, %0;"					      \
+		     "rorw $8, %w0"					      \
+		     : "=r" (__v)					      \
+		     : "0" (__x)					      \
+		     : "cc");						      \
+	  __v; }))
+#  endif
+# else
+#  define __bswap_32(x) \
+     (__extension__							      \
+      ({ register unsigned int __x = (x); __bswap_constant_32 (__x); }))
+# endif
+#else
+static __inline unsigned int
+__bswap_32 (unsigned int __bsx)
+{
+  return __bswap_constant_32 (__bsx);
+}
+#endif
+
+
+#if __GNUC_PREREQ (2, 0)
+/* Swap bytes in 64 bit value.  */
+# define __bswap_constant_64(x) \
+     (__extension__ ((((x) & 0xff00000000000000ull) >> 56)		      \
+		     | (((x) & 0x00ff000000000000ull) >> 40)		      \
+		     | (((x) & 0x0000ff0000000000ull) >> 24)		      \
+		     | (((x) & 0x000000ff00000000ull) >> 8)		      \
+		     | (((x) & 0x00000000ff000000ull) << 8)		      \
+		     | (((x) & 0x0000000000ff0000ull) << 24)		      \
+		     | (((x) & 0x000000000000ff00ull) << 40)		      \
+		     | (((x) & 0x00000000000000ffull) << 56)))
+
+# if __GNUC_PREREQ (4, 3)
+static __inline __uint64_t
+__bswap_64 (__uint64_t __bsx)
+{
+  return __builtin_bswap64 (__bsx);
+}
+# elif __WORDSIZE == 64
+#  define __bswap_64(x) \
+     (__extension__							      \
+      ({ register __uint64_t __v, __x = (x);				      \
+	 if (__builtin_constant_p (__x))				      \
+	   __v = __bswap_constant_64 (__x);				      \
+	 else								      \
+	   __asm__ ("bswap %q0" : "=r" (__v) : "0" (__x));		      \
+	 __v; }))
+# else
+#  define __bswap_64(x) \
+     (__extension__                                                           \
+      ({ union { __extension__ __uint64_t __ll;		                      \
+		 unsigned int __l[2]; } __w, __r;                             \
+	 if (__builtin_constant_p (x))                                        \
+	   __r.__ll = __bswap_constant_64 (x);                                \
+	 else                                                                 \
+	   {                                                                  \
+	     __w.__ll = (x);                                                  \
+	     __r.__l[0] = __bswap_32 (__w.__l[1]);                            \
+	     __r.__l[1] = __bswap_32 (__w.__l[0]);                            \
+	   }                                                                  \
+	 __r.__ll; }))
+# endif
+#elif __GLIBC_HAVE_LONG_LONG
+# define __bswap_constant_64(x) \
+     ((((x) & 0xff00000000000000ull) >> 56)				      \
+      | (((x) & 0x00ff000000000000ull) >> 40)				      \
+      | (((x) & 0x0000ff0000000000ull) >> 24)				      \
+      | (((x) & 0x000000ff00000000ull) >> 8)				      \
+      | (((x) & 0x00000000ff000000ull) << 8)				      \
+      | (((x) & 0x0000000000ff0000ull) << 24)				      \
+      | (((x) & 0x000000000000ff00ull) << 40)				      \
+      | (((x) & 0x00000000000000ffull) << 56))
+
+static __inline __uint64_t
+__bswap_64 (__uint64_t __bsx)
+{
+  return __bswap_constant_64 (__bsx);
+}
+#endif
+
+#endif /* _BITS_BYTESWAP_H */

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/endian.h	Fri Feb 15 14:20:08 2019 +0900
@@ -0,0 +1,100 @@
+/* Copyright (C) 1992-2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef	_ENDIAN_H
+#define	_ENDIAN_H	1
+
+#include <features.h>
+
+/* Definitions for byte order, according to significance of bytes,
+   from low addresses to high addresses.  The value is what you get by
+   putting '4' in the most significant byte, '3' in the second most
+   significant byte, '2' in the second least significant byte, and '1'
+   in the least significant byte, and then writing down one digit for
+   each byte, starting with the byte at the lowest address at the left,
+   and proceeding to the byte with the highest address at the right.  */
+
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+#define	__PDP_ENDIAN	3412
+
+/* This file defines `__BYTE_ORDER' for the particular machine.  */
+#include <bits/endian.h>
+
+/* Some machines may need to use a different endianness for floating point
+   values.  */
+#ifndef __FLOAT_WORD_ORDER
+# define __FLOAT_WORD_ORDER __BYTE_ORDER
+#endif
+
+#ifdef	__USE_BSD
+# define LITTLE_ENDIAN	__LITTLE_ENDIAN
+# define BIG_ENDIAN	__BIG_ENDIAN
+# define PDP_ENDIAN	__PDP_ENDIAN
+# define BYTE_ORDER	__BYTE_ORDER
+#endif
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define __LONG_LONG_PAIR(HI, LO) LO, HI
+#elif __BYTE_ORDER == __BIG_ENDIAN
+# define __LONG_LONG_PAIR(HI, LO) HI, LO
+#endif
+
+
+#if defined __USE_BSD && !defined __ASSEMBLER__
+/* Conversion interfaces.  */
+# include <bits/byteswap.h>
+
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define htobe16(x) __bswap_16 (x)
+#  define htole16(x) (x)
+#  define be16toh(x) __bswap_16 (x)
+#  define le16toh(x) (x)
+
+#  define htobe32(x) __bswap_32 (x)
+#  define htole32(x) (x)
+#  define be32toh(x) __bswap_32 (x)
+#  define le32toh(x) (x)
+
+#  if __GLIBC_HAVE_LONG_LONG
+#   define htobe64(x) __bswap_64 (x)
+#   define htole64(x) (x)
+#   define be64toh(x) __bswap_64 (x)
+#   define le64toh(x) (x)
+#  endif
+
+# else
+#  define htobe16(x) (x)
+#  define htole16(x) __bswap_16 (x)
+#  define be16toh(x) (x)
+#  define le16toh(x) __bswap_16 (x)
+
+#  define htobe32(x) (x)
+#  define htole32(x) __bswap_32 (x)
+#  define be32toh(x) (x)
+#  define le32toh(x) __bswap_32 (x)
+
+#  if __GLIBC_HAVE_LONG_LONG
+#   define htobe64(x) (x)
+#   define htole64(x) __bswap_64 (x)
+#   define be64toh(x) (x)
+#   define le64toh(x) __bswap_64 (x)
+#  endif
+# endif
+#endif
+
+#endif	/* endian.h */