Signed-off-by: Keith Packard <[email protected]>
---
include/misc.h | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/include/misc.h b/include/misc.h
index 0c67f11..17de710 100644
--- a/include/misc.h
+++ b/include/misc.h
@@ -305,6 +305,35 @@ __builtin_constant_p(int x)
}
#endif
+/* byte swap a 64-bit value */
+static inline void
+swap_uint64(uint64_t *x)
+{
+ char n;
+
+ n = ((char *) x)[0];
+ ((char *) x)[0] = ((char *) x)[7];
+ ((char *) x)[7] = n;
+
+ n = ((char *) x)[1];
+ ((char *) x)[1] = ((char *) x)[6];
+ ((char *) x)[6] = n;
+
+ n = ((char *) x)[2];
+ ((char *) x)[2] = ((char *) x)[5];
+ ((char *) x)[5] = n;
+
+ n = ((char *) x)[3];
+ ((char *) x)[3] = ((char *) x)[4];
+ ((char *) x)[4] = n;
+}
+
+#define swapll(x) do { \
+ if (sizeof(*(x)) != 8) \
+ wrong_size(); \
+ swap_uint64((uint64_t *)(x)); \
+ } while (0)
+
/* byte swap a 32-bit value */
static inline void
swap_uint32(uint32_t * x)
--
1.8.4.rc3
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