Rename byteswap_.h to byteswap.in.h.

[gnulib.git] / lib / byteswap.in.h

diff --git a/lib/byteswap.in.h b/lib/byteswap.in.h
new file mode 100644 (file)
index 0000000..ca85544
--- /dev/null
+++ b/lib/byteswap.in.h
@@ -0,0 +1,45 @@
+/* byteswap.h - Byte swapping
+   Copyright (C) 2005, 2007 Free Software Foundation, Inc.
+   Written by Oskar Liljeblad <oskar@osk.mine.nu>, 2005.
+
+   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, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _GL_BYTESWAP_H
+#define _GL_BYTESWAP_H
+
+/* Given an unsigned 16-bit argument X, return the value corresponding to
+   X with reversed byte order.  */
+#define bswap_16(x) ((((x) & 0x00FF) << 8) | \
+                    (((x) & 0xFF00) >> 8))
+
+/* Given an unsigned 32-bit argument X, return the value corresponding to
+   X with reversed byte order.  */
+#define bswap_32(x) ((((x) & 0x000000FF) << 24) | \
+                    (((x) & 0x0000FF00) << 8) | \
+                    (((x) & 0x00FF0000) >> 8) | \
+                    (((x) & 0xFF000000) >> 24))
+
+/* Given an unsigned 64-bit argument X, return the value corresponding to
+   X with reversed byte order.  */
+#define bswap_64(x) ((((x) & 0x00000000000000FFULL) << 56) | \
+                    (((x) & 0x000000000000FF00ULL) << 40) | \
+                    (((x) & 0x0000000000FF0000ULL) << 24) | \
+                    (((x) & 0x00000000FF000000ULL) << 8) | \
+                    (((x) & 0x000000FF00000000ULL) >> 8) | \
+                    (((x) & 0x0000FF0000000000ULL) >> 24) | \
+                    (((x) & 0x00FF000000000000ULL) >> 40) | \
+                    (((x) & 0xFF00000000000000ULL) >> 56))
+
+#endif /* _GL_BYTESWAP_H */