byte-order: Make uint32_byteswap() available regardless of endianness.

[sliver-openvswitch.git] / lib / byte-order.h

diff --git a/lib/byte-order.h b/lib/byte-order.h
index 993137f..352f91e 100644 (file)
--- a/lib/byte-order.h
+++ b/lib/byte-order.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2010, 2011 Nicira Networks.
+ * Copyright (c) 2008, 2010, 2011, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,6 +40,14 @@ ovs_be64 htonll(uint64_t);
 uint64_t ntohll(ovs_be64);
 #endif
 
+static inline uint32_t
+uint32_byteswap(uint32_t crc) {
+    return (((crc & 0x000000ff) << 24) |
+            ((crc & 0x0000ff00) <<  8) |
+            ((crc & 0x00ff0000) >>  8) |
+            ((crc & 0xff000000) >> 24));
+}
+
 /* These macros may substitute for htons(), htonl(), and htonll() in contexts
  * where function calls are not allowed, such as case labels.  They should not
  * be used elsewhere because all of them evaluate their argument many times. */