+/**
+ * @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__ */