Moved bswap functions to ddsrt (#297)

* Moved bswap functions to ddsrt

Moved the byte swapping functions from ddsi to ddsrt so that
these can be re-used in e.g. the security plugins and tests.

Signed-off-by: Dennis Potman <dennis.potman@adlinktech.com>

* Moved  decarations for bswap functions to ddsrt

Signed-off-by: Dennis Potman <dennis.potman@adlinktech.com>

src/ddsrt/CMakeLists.txt

@@ -116,6 +116,7 @@ list(APPEND headers
   "${include_path}/dds/ddsrt/static_assert.h")
 
 list(APPEND sources
+  "${source_path}/bswap.c"
   "${source_path}/io.c"
   "${source_path}/log.c"
   "${source_path}/retcode.c"

src/ddsrt/include/dds/ddsrt/bswap.h

@@ -0,0 +1,87 @@
+/*
+ * Copyright(c) 2006 to 2018 ADLINK Technology Limited and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
+ * v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+#ifndef DDSRT_BSWAP_H
+#define DDSRT_BSWAP_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "dds/ddsrt/endian.h"
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+inline uint16_t ddsrt_bswap2u (uint16_t x)
+{
+  return (uint16_t) ((x >> 8) | (x << 8));
+}
+
+inline int16_t ddsrt_bswap2 (int16_t x)
+{
+  return (int16_t) ddsrt_bswap2u ((uint16_t) x);
+}
+
+inline uint32_t ddsrt_bswap4u (uint32_t x)
+{
+  return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
+}
+
+inline int32_t ddsrt_bswap4 (int32_t x)
+{
+  return (int32_t) ddsrt_bswap4u ((uint32_t) x);
+}
+
+inline uint64_t ddsrt_bswap8u (uint64_t x)
+{
+  const uint32_t newhi = ddsrt_bswap4u ((uint32_t) x);
+  const uint32_t newlo = ddsrt_bswap4u ((uint32_t) (x >> 32));
+  return ((uint64_t) newhi << 32) | (uint64_t) newlo;
+}
+
+inline int64_t ddsrt_bswap8 (int64_t x)
+{
+  return (int64_t) ddsrt_bswap8u ((uint64_t) x);
+}
+
+#if DDSRT_ENDIAN == DDSRT_LITTLE_ENDIAN
+#define ddsrt_toBE2(x) ddsrt_bswap2 (x)
+#define ddsrt_toBE2u(x) ddsrt_bswap2u (x)
+#define ddsrt_toBE4(x) ddsrt_bswap4 (x)
+#define ddsrt_toBE4u(x) ddsrt_bswap4u (x)
+#define ddsrt_toBE8(x) ddsrt_bswap8 (x)
+#define ddsrt_toBE8u(x) ddsrt_bswap8u (x)
+#define ddsrt_fromBE2(x) ddsrt_bswap2 (x)
+#define ddsrt_fromBE2u(x) ddsrt_bswap2u (x)
+#define ddsrt_fromBE4(x) ddsrt_bswap4 (x)
+#define ddsrt_fromBE4u(x) ddsrt_bswap4u (x)
+#define ddsrt_fromBE8(x) ddsrt_bswap8 (x)
+#define ddsrt_fromBE8u(x) ddsrt_bswap8u (x)
+#else
+#define ddsrt_toBE2u(x) (x)
+#define ddsrt_toBE4(x) (x)
+#define ddsrt_toBE4u(x) (x)
+#define ddsrt_toBE8(x) (x)
+#define ddsrt_toBE8u(x) (x)
+#define ddsrt_fromBE2(x) (x)
+#define ddsrt_fromBE2u(x) (x)
+#define ddsrt_fromBE4(x) (x)
+#define ddsrt_fromBE4u(x) (x)
+#define ddsrt_fromBE8(x) (x)
+#define ddsrt_fromBE8u(x) (x)
+#endif
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* DDSRT_BSWAP_H */

src/ddsrt/src/bswap.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright(c) 2006 to 2018 ADLINK Technology Limited and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
+ * v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+#include "dds/ddsrt/bswap.h"
+
+extern inline uint16_t ddsrt_bswap2u (uint16_t x);
+extern inline uint32_t ddsrt_bswap4u (uint32_t x);
+extern inline uint64_t ddsrt_bswap8u (uint64_t x);
+extern inline int16_t ddsrt_bswap2 (int16_t x);
+extern inline int32_t ddsrt_bswap4 (int32_t x);
+extern inline int64_t ddsrt_bswap8 (int64_t x);