Byte swapping functions in endian.h

Change-Id: I6015d0f59a8191f456cb4ece524fe4e6ec67dc07
RTC: 39734
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/828
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/include/endian.h b/src/include/endian.h
index 27248d892..5b6cb06d2 100644
--- a/src/include/endian.h
+++ b/src/include/endian.h
@@ -28,4 +28,42 @@
 
 #define __BYTE_ORDER __BIG_ENDIAN
 
+#define __swap16(x) \
+    ((((x) & 0xFF00) >> 8) | \
+     (((x) & 0x00FF) << 8))
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+// Big Endian system
+#define htobe16(x) (x)
+#define htole16(x) __swap16(x)
+#define be16toh(x) (x)
+#define le16toh(x) __swap16(x)
+
+#define htobe32(x) (x)
+#define htole32(x) __builtin_bswap32(x)
+#define be32toh(x) (x)
+#define le32toh(x) __builtin_bswap32(x)
+
+#define htobe64(x) (x)
+#define htole64(x) __builtin_bswap64(x)
+#define be64toh(x) (x)
+#define le64toh(x) __builtin_bswap64(x)
+#else
+// Little Endian system
+#define htobe16(x) __swap16(x)
+#define htole16(x) (x)
+#define be16toh(x) __swap16(x)
+#define le16toh(x) (x)
+
+#define htobe32(x) __builtin_bswap32(x)
+#define htole32(x) (x)
+#define be32toh(x) __builtin_bswap32(x)
+#define le32toh(x) (x)
+
+#define htobe64(x) __builtin_bswap64(x)
+#define htole64(x) (x)
+#define be64toh(x) __builtin_bswap64(x)
+#define le64toh(x) (x)
+#endif
+
 #endif