/**
 * @file bswap.h
 * byte swap.
 */

#ifndef __BSWAP_H__
#define __BSWAP_H__

#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#else

#ifdef ARCH_X86
//static inline unsigned short ByteSwap16(unsigned short x)
//{
//  __asm("xchgb %b0,%h0"	:
//        "=q" (x)	:
//        "0" (x));
//    return x;
//}
//#define bswap_16(x) ByteSwap16(x)
//
//static inline unsigned int ByteSwap32(unsigned int x)
//{
//#if __CPU__ > 386
// __asm("bswap	%0":
//      "=r" (x)     :
//#else
// __asm("xchgb	%b0,%h0\n"
//      "	rorl	$16,%0\n"
//      "	xchgb	%b0,%h0":
//      "=q" (x)		:
//#endif
//      "0" (x));
//  return x;
//}
//#define bswap_32(x) ByteSwap32(x)
//
//static inline unsigned long long int ByteSwap64(unsigned long long int x)
//{
//  register union { __extension__ uint64_t __ll;
//          uint32_t __l[2]; } __x;
//  asm("xchgl	%0,%1":
//      "=r"(__x.__l[0]),"=r"(__x.__l[1]):
//      "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
//  return __x.__ll;
//}
//#define bswap_64(x) ByteSwap64(x)
//
//#elif defined(ARCH_SH4)
//
//static inline uint16_t ByteSwap16(uint16_t x) {
//	__asm__("swap.b %0,%0":"=r"(x):"0"(x));
//	return x;
//}
//
//static inline uint32_t ByteSwap32(uint32_t x) {
//	__asm__(
//	"swap.b %0,%0\n"
//	"swap.w %0,%0\n"
//	"swap.b %0,%0\n"
//	:"=r"(x):"0"(x));
//	return x;
//}
//
//#define bswap_16(x) ByteSwap16(x)
//#define bswap_32(x) ByteSwap32(x)
//
//static inline uint64_t ByteSwap64(uint64_t x)
//{
//    union { 
//        uint64_t ll;
//        struct {
//           uint32_t l,h;
//        } l;
//    } r;
//    r.l.l = bswap_32 (x);
//    r.l.h = bswap_32 (x>>32);
//    return r.ll;
//}
//#define bswap_64(x) ByteSwap64(x)
//
//#else
//
#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
			

// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
#define bswap_32(x) \
     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))

static inline uint64_t ByteSwap64(uint64_t x)
{
    union { 
        uint64_t ll;
        uint32_t l[2]; 
    } w, r;
    w.ll = x;
    r.l[0] = bswap_32 (w.l[1]);
    r.l[1] = bswap_32 (w.l[0]);
    return r.ll;
}
#define bswap_64(x) ByteSwap64(x)

#endif	/* !ARCH_X86 */

#endif	/* !HAVE_BYTESWAP_H */

// be2me ... BigEndian to MachineEndian
// le2me ... LittleEndian to MachineEndian

#ifdef WORDS_BIGENDIAN
#define be2me_16(x) (x)
#define be2me_32(x) (x)
#define be2me_64(x) (x)
#define le2me_16(x) bswap_16(x)
#define le2me_32(x) bswap_32(x)
#define le2me_64(x) bswap_64(x)
#else
#define be2me_16(x) bswap_16(x)
#define be2me_32(x) bswap_32(x)
#define be2me_64(x) bswap_64(x)
#define le2me_16(x) (x)
#define le2me_32(x) (x)
#define le2me_64(x) (x)
#endif

#endif /* __BSWAP_H__ */