- Added a directory to hold contributed code which has not been integrated

with the library yet.

- The byteswap code was contributed by Peter Bengtsson. Thank you very much!


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15163 87f5fb63-7c3d-0410-a384-fd976d0f7a62

library/contrib/byteswap/byteswap_bswap24.c

@@ -0,0 +1,29 @@
+
+#if defined(__PPC__) && defined(__GNUC__)
+
+asm("	.text\n\
+	.align 2\n\
+	.globl bswap24\n\
+	.type	bswap24, @function\n\
+bswap32:\n\
+	rlwinm	%r4,%r3,16,8,31\n\
+	rlwimi	%r4,%r3,0,16,24\n\
+	or			%r3,%r4,%r4\n\
+	blr\n\
+");
+
+#else
+
+#include <stdint.h>
+
+uint32_t bswap24(uint32_t u32)
+{
+	return(
+		((u32&0xff)<<16)|
+		((u32&0xff00))|
+		((u32&0xff0000)>>16)
+	);
+}
+
+#endif
+