new generic bit operations by Michael Walle

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1850 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -12,6 +12,9 @@
   * configure.ac: Change to newer libtool macro (LT_INIT) to avoid warnings.
   * acinclude.m4: Redirect LT_INIT to AC_PROG_LIBTOOL for older libtools.
 
+  * include/urjtag/bitops.h: New generic bit operations by Michael Walle.
+  * include/urjtag/Makefile.am (pkginclude_HEADERS): Add bitops.h
+
 2010-08-30  Mike Frysinger  <vapier@gentoo.org>
 
   * configure.ac: Clean up libusb detection to prefer 1.0 over 0.1, and accept

urjtag/include/urjtag/Makefile.am

@@ -26,6 +26,7 @@ include $(top_srcdir)/Makefile.rules
 pkginclude_HEADERS = \
 	bfin.h \
 	bitmask.h \
+	bitops.h \
 	bsbit.h \
 	bsdl.h \
 	bsdl_mode.h \

urjtag/include/urjtag/bitops.h

@@ -0,0 +1,54 @@
+/*
+ * $Id$
+ *
+ * Copyright (C) 2010, Michael Walle
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ */
+
+#ifndef URJ_BITOPS_H
+#define URJ_BITOPS_H
+
+#include <stdint.h>
+
+static inline uint16_t flip16 (uint16_t v)
+{
+    int i;
+    uint16_t out = 0;
+
+    /* flip bits (from left to right) */
+    for (i = 0; i < 16; i++)
+        if (v & (1 << i))
+            out |= (1 << (15 - i));
+
+    return out;
+}
+
+static inline uint32_t flip32 (uint32_t v)
+{
+    int i;
+    uint32_t out = 0;
+
+    /* flip bits (from left to right) */
+    for (i = 0; i < 32; i++)
+        if (v & (1 << i))
+            out |= (1 << (31 - i));
+
+    return out;
+}
+
+#endif /* URJ_BITOPS_H */