--- /dev/null
+/*
+ * stdendian.h
+ *
+ * This header defines the following endian macros as defined here:
+ * http://austingroupbugs.net/view.php?id=162
+ *
+ * BYTE_ORDER this macro shall have a value equal to one
+ * of the *_ENDIAN macros in this header.
+ * LITTLE_ENDIAN if BYTE_ORDER == LITTLE_ENDIAN, the host
+ * byte order is from least significant to
+ * most significant.
+ * BIG_ENDIAN if BYTE_ORDER == BIG_ENDIAN, the host byte
+ * order is from most significant to least
+ * significant.
+ *
+ * The following are defined as macros:
+ *
+ * uint16_t bswap16(uint16_t x);
+ * uint32_t bswap32(uint32_t x);
+ * uint64_t bswap64(uint64_t x);
+
+ * uint16_t htobe16(uint16_t x);
+ * uint16_t htole16(uint16_t x);
+ * uint16_t be16toh(uint16_t x);
+ * uint16_t le16toh(uint16_t x);
+ *
+ * uint32_t htobe32(uint32_t x);
+ * uint32_t htole32(uint32_t x);
+ * uint32_t be32toh(uint32_t x);
+ * uint32_t le32toh(uint32_t x);
+ *
+ * uint64_t htobe64(uint64_t x);
+ * uint64_t htole64(uint64_t x);
+ * uint64_t be64toh(uint64_t x);
+ * uint64_t le64toh(uint64_t x);
+ *
+ * The header defines the following macro for OpenCL compatibility
+ * https://www.khronos.org/registry/cl/sdk/2.0/docs/man/xhtml/preprocessorDirectives.html
+ *
+ * __ENDIAN_LITTLE__ if BYTE_ORDER == LITTLE_ENDIAN then this
+ * macro is present for OpenCL compatibility
+ *
+ * The implementation provides a uniform interface to endian macros using only
+ * system headers on recent Linux, Darwin, FreeBSD, Solaris and Windows systems.
+ *
+ * This approach is intended to avoid the need for preflight configure scripts.
+ * An alternative approach would be to test compiler CPU architecture marcros.
+ *
+ * This header has had *limited* testing on recent C11/C++11 compilers and is
+ * based on the austin bug tracker interface, manpages, and headers present in
+ * Linux, FreeBSD, Windows, Solaris and Darwin.
+ *
+ * The header uses __builtin_bswapXX intrinsic with GCC/Clang (__GNUC__) on
+ * platforms that do not provide bswap16, bswap32, bswap64 (Darwin)
+ *
+ * Public Domain.
+ */
+
+#if HAVE_STDINT_H
+#include <stdint.h>
+#endif
+
+/* Linux / GLIBC */
+#if defined(__linux__) || defined(__GLIBC__)
+#include <endian.h>
+#include <byteswap.h>
+#define __ENDIAN_DEFINED 1
+#define __BSWAP_DEFINED 1
+#define __HOSTSWAP_DEFINED 1
+#define _BYTE_ORDER __BYTE_ORDER
+#define _LITTLE_ENDIAN __LITTLE_ENDIAN
+#define _BIG_ENDIAN __BIG_ENDIAN
+#define bswap16(x) bswap_16(x)
+#define bswap32(x) bswap_32(x)
+#define bswap64(x) bswap_64(x)
+#endif /* __linux__ || __GLIBC__ */
+
+/* BSD */
+#if defined(__FreeBSD__) || defined(__NetBSD__) || \
+ defined(__DragonFly__) || defined(__OpenBSD__)
+#include <sys/endian.h>
+#define __ENDIAN_DEFINED 1
+#define __BSWAP_DEFINED 1
+#define __HOSTSWAP_DEFINED 1
+#endif /* BSD */
+
+/* Solaris */
+#if defined (sun)
+#include <sys/isa_defs.h>
+#include <sys/byteorder.h>
+#define bswap16(x) BSWAP_16(x)
+#define bswap32(x) BSWAP_32(x)
+#define bswap64(x) BSWAP_64(x)
+/* sun headers don't set a value for _LITTLE_ENDIAN or _BIG_ENDIAN */
+#if defined(_LITTLE_ENDIAN)
+#undef _LITTLE_ENDIAN
+#define _LITTLE_ENDIAN 1234
+#define _BIG_ENDIAN 4321
+#define _BYTE_ORDER _LITTLE_ENDIAN
+#elif defined(_BIG_ENDIAN)
+#undef _BIG_ENDIAN
+#define _LITTLE_ENDIAN 1234
+#define _BIG_ENDIAN 4321
+#define _BYTE_ORDER _BIG_ENDIAN
+#endif
+#define __ENDIAN_DEFINED 1
+#endif /* sun */
+
+/* Windows */
+#if defined(_WIN32) || defined(_MSC_VER)
+/* assumes all Microsoft targets are little endian */
+#define _LITTLE_ENDIAN 1234
+#define _BIG_ENDIAN 4321
+#define _BYTE_ORDER _LITTLE_ENDIAN
+#define __ENDIAN_DEFINED 1
+#endif /* _MSC_VER */
+
+/* OS X */
+#if defined(__APPLE__)
+#include <machine/endian.h>
+#define _BYTE_ORDER BYTE_ORDER
+#define _LITTLE_ENDIAN LITTLE_ENDIAN
+#define _BIG_ENDIAN BIG_ENDIAN
+#define __ENDIAN_DEFINED 1
+#endif /* __APPLE__ */
+
+/* OpenCL */
+#if defined (__OPENCL_VERSION__)
+#define _LITTLE_ENDIAN 1234
+#define __BIG_ENDIAN 4321
+#if defined (__ENDIAN_LITTLE__)
+#define _BYTE_ORDER _LITTLE_ENDIAN
+#else
+#define _BYTE_ORDER _BIG_ENDIAN
+#endif
+#define bswap16(x) as_ushort(as_uchar2(ushort(x)).s1s0)
+#define bswap32(x) as_uint(as_uchar4(uint(x)).s3s2s1s0)
+#define bswap64(x) as_ulong(as_uchar8(ulong(x)).s7s6s5s4s3s2s1s0)
+#define __ENDIAN_DEFINED 1
+#define __BSWAP_DEFINED 1
+#endif
+
+/* Unknown */
+#if !__ENDIAN_DEFINED
+#error Could not determine CPU byte order
+#endif
+
+/* POSIX - http://austingroupbugs.net/view.php?id=162 */
+#ifndef BYTE_ORDER
+#define BYTE_ORDER _BYTE_ORDER
+#endif
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN _LITTLE_ENDIAN
+#endif
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN _BIG_ENDIAN
+#endif
+
+/* OpenCL compatibility - define __ENDIAN_LITTLE__ on little endian systems */
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+#if !defined (__ENDIAN_LITTLE__)
+#define __ENDIAN_LITTLE__ 1
+#endif
+#endif
+
+/* Byte swap macros */
+#if !__BSWAP_DEFINED
+
+#ifndef bswap16
+/* handle missing __builtin_bswap16 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624 */
+#if defined __GNUC__
+/* define bswap16(x) __builtin_bswap16(x) */
+#else
+#define bswap16(x) ((uint16_t)((((uint16_t) (x) & 0xff00) >> 8) | \
+ (((uint16_t) (x) & 0x00ff) << 8)))
+#endif
+#endif
+
+#ifndef bswap32
+#if defined __GNUC__
+#define bswap32(x) __builtin_bswap32(x)
+#else
+#define bswap32(x) ((uint32_t)((((uint32_t) (x) & 0xff000000) >> 24) | \
+ (((uint32_t) (x) & 0x00ff0000) >> 8) | \
+ (((uint32_t) (x) & 0x0000ff00) << 8) | \
+ (((uint32_t) (x) & 0x000000ff) << 24)))
+#endif
+#endif
+
+#ifndef bswap64
+#if defined __GNUC__
+#define bswap64(x) __builtin_bswap64(x)
+#else
+#define bswap64(x) ((uint64_t)((((uint64_t) (x) & 0xff00000000000000ull) >> 56) | \
+ (((uint64_t) (x) & 0x00ff000000000000ull) >> 40) | \
+ (((uint64_t) (x) & 0x0000ff0000000000ull) >> 24) | \
+ (((uint64_t) (x) & 0x000000ff00000000ull) >> 8) | \
+ (((uint64_t) (x) & 0x00000000ff000000ull) << 8) | \
+ (((uint64_t) (x) & 0x0000000000ff0000ull) << 24) | \
+ (((uint64_t) (x) & 0x000000000000ff00ull) << 40) | \
+ (((uint64_t) (x) & 0x00000000000000ffull) << 56)))
+#endif
+#endif
+
+#endif
+
+/* Host swap macros */
+#ifndef __HOSTSWAP_DEFINED
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define htobe16(x) bswap16((x))
+#define htole16(x) ((uint16_t)(x))
+#define be16toh(x) bswap16((x))
+#define le16toh(x) ((uint16_t)(x))
+
+#define htobe32(x) bswap32((x))
+#define htole32(x) ((uint32_t)(x))
+#define be32toh(x) bswap32((x))
+#define le32toh(x) ((uint32_t)(x))
+
+#define htobe64(x) bswap64((x))
+#define htole64(x) ((uint64_t)(x))
+#define be64toh(x) bswap64((x))
+#define le64toh(x) ((uint64_t)(x))
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define htobe16(x) ((uint16_t)(x))
+#define htole16(x) bswap16((x))
+#define be16toh(x) ((uint16_t)(x))
+#define le16toh(x) bswap16((x))
+
+#define htobe32(x) ((uint32_t)(x))
+#define htole32(x) bswap32((x))
+#define be32toh(x) ((uint32_t)(x))
+#define le64toh(x) bswap64((x))
+
+#define htobe64(x) ((uint64_t)(x))
+#define htole64(x) bswap64((x))
+#define be64toh(x) ((uint64_t)(x))
+#define le32toh(x) bswap32((x))
+#endif
+#endif
+
+
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