Add endian.h and byteswap.h

Change-Id: I181783e53dba01b00ea53965a325823fb3d58abf
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

3 files changed, 129 insertions, 1 deletions

diff --git a/libgnu/Makefile.am b/libgnu/Makefile.am
index 0d31e693..37fdb9ca 100644
--- a/libgnu/Makefile.am
+++ b/libgnu/Makefile.am
@@ -35,7 +35,22 @@ noinst_LIBRARIES =
 MOSTLYCLEANFILES =
 MOSTLYCLEANDIRS =
 BUILT_SOURCES =
-EXTRA_DIST =
+EXTRA_DIST = endian.in.h byteswap.in.h
 CLEANFILES =
 SUFFIXES =
+
+if !HAVE_ENDIAN_H
+endian.h: endian.in.h
+	$(AM_V_GEN)rm -f $@ && cat $< > $@
+BUILT_SOURCES += endian.h
+MOSTLYCLEANFILES += endian.h
+endif
+
+if !HAVE_BYTESWAP_H
+byteswap.h: byteswap.in.h
+	$(AM_V_GEN)rm -f $@ && cat $< > $@
+BUILT_SOURCES += byteswap.h
+MOSTLYCLEANFILES += byteswap.h
+endif
+
 include gnulib.am
diff --git a/libgnu/byteswap.in.h b/libgnu/byteswap.in.h
new file mode 100644
index 00000000..e7b4f29e
--- /dev/null
+++ b/libgnu/byteswap.in.h
@@ -0,0 +1,38 @@
+/* Byteswapping functions for windows
+   Copyright (C) 2017 The Qt Company Ltd.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * 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
+
+   or both in parallel, as here.
+
+   elfutils 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIB_BYTESWAP_H
+#define LIB_BYTESWAP_H 1
+
+#include <stdlib.h>
+
+#define bswap_16(x) __builtin_bswap16(x)
+#define bswap_32(x) __builtin_bswap32(x)
+#define bswap_64(x) __builtin_bswap64(x)
+
+#endif
diff --git a/libgnu/endian.in.h b/libgnu/endian.in.h
new file mode 100644
index 00000000..c4fa1514
--- /dev/null
+++ b/libgnu/endian.in.h
@@ -0,0 +1,75 @@
+/* Endianness related defines for windows
+   Copyright (C) 2017 The Qt Company Ltd.
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * 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
+
+   or both in parallel, as here.
+
+   elfutils 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 copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIB_ENDIAN_H
+#define LIB_ENDIAN_H 1
+
+#include <sys/param.h>
+
+#define __BYTE_ORDER    BYTE_ORDER
+#define __BIG_ENDIAN    BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#define __PDP_ENDIAN    PDP_ENDIAN
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+
+#define htobe16(x) __builtin_bswap16(x)
+#define htole16(x) (x)
+#define be16toh(x) __builtin_bswap16(x)
+#define le16toh(x) (x)
+
+#define htobe32(x) __builtin_bswap32(x)
+#define htole32(x) (x)
+#define be32toh(x) __builtin_bswap32(x)
+#define le32toh(x) (x)
+
+#define htobe64(x) __builtin_bswap64(x)
+#define htole64(x) (x)
+#define be64toh(x) __builtin_bswap64(x)
+#define le64toh(x) (x)
+
+#elif BYTE_ORDER == BIG_ENDIAN
+
+#define htobe16(x) (x)
+#define htole16(x) __builtin_bswap16(x)
+#define be16toh(x) (x)
+#define le16toh(x) __builtin_bswap16(x)
+
+#define htobe32(x) (x)
+#define htole32(x) __builtin_bswap32(x)
+#define be32toh(x) (x)
+#define le32toh(x) __builtin_bswap32(x)
+
+#define htobe64(x) (x)
+#define htole64(x) __builtin_bswap64(x)
+#define be64toh(x) (x)
+#define le64toh(x) __builtin_bswap64(x)
+
+#endif
+
+#endif // LIB_ENDIAN_H