Merge r3439: Endianness optimisation

Try to get the endianess optimization working, by including an assortment
of possibly relevant headers and only go with the fast path if we have
credible information that this is a big-endian platform.



git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@3639 d4fa192b-c00b-0410-8231-f00ffab90ce4

configure.ac

@@ -70,11 +70,13 @@ AC_SUBST(LIBM)
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME
+AC_CHECK_HEADERS([sys/endian.h])
 AC_CHECK_HEADERS([sys/filio.h])
 AC_CHECK_HEADERS([sys/mount.h])
 AC_CHECK_HEADERS([sys/socket.h])
 AC_CHECK_HEADERS([sys/statvfs.h])
 AC_CHECK_HEADERS([sys/vfs.h])
+AC_CHECK_HEADERS([endian.h])
 AC_CHECK_HEADERS([netinet/in.h])
 AC_CHECK_HEADERS([pthread_np.h])
 AC_CHECK_HEADERS([stddef.h])

lib/libvarnish/vsha256.c

@@ -26,10 +26,22 @@
  * From: $FreeBSD: head/lib/libmd/sha256c.c 154479 2006-01-17 15:35:57Z phk $
  */
 
-#include <stdint.h>
+#include "config.h"
 
+#include <stdint.h>
 #include <string.h>
 
+#ifdef HAVE_ENDIAN_H
+#include <endian.h>
+#define BYTE_ORDER	__BYTE_ORDER
+#define BIG_ENDIAN	__BIG_ENDIAN
+#endif
+#ifdef HAVE_SYS_ENDIAN_H
+#include <sys/endian.h>
+#define BYTE_ORDER	_BYTE_ORDER
+#define BIG_ENDIAN	_BIG_ENDIAN
+#endif
+
 #include "vsha256.h"
 
 #if defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN