Initial Contribution

1 files changed, 69 insertions, 0 deletions

diff --git a/include/utils/ByteOrder.h b/include/utils/ByteOrder.h
new file mode 100644
index 000000000..4c0606763
--- /dev/null
+++ b/include/utils/ByteOrder.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+
+#ifndef _LIBS_UTILS_BYTE_ORDER_H
+#define _LIBS_UTILS_BYTE_ORDER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#ifdef HAVE_WINSOCK
+#include <winsock2.h>
+#else
+#include <netinet/in.h>
+#endif
+
+/*
+ * These macros are like the hton/ntoh byte swapping macros,
+ * except they allow you to swap to and from the "device" byte
+ * order.  The device byte order is the endianness of the target
+ * device -- for the ARM CPUs we use today, this is little endian.
+ *
+ * Note that the byte swapping functions have not been optimized
+ * much; performance is currently not an issue for them since the
+ * intent is to allow us to avoid byte swapping on the device.
+ */
+
+#define DEVICE_BYTE_ORDER LITTLE_ENDIAN
+
+#if BYTE_ORDER == DEVICE_BYTE_ORDER
+
+#define	dtohl(x)	(x)
+#define	dtohs(x)	(x)
+#define	htodl(x)	(x)
+#define	htods(x)	(x)
+
+#else
+
+static inline uint32_t android_swap_long(uint32_t v)
+{
+    return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24);
+}
+
+static inline uint16_t android_swap_short(uint16_t v)
+{
+    return (v<<8) | (v>>8);
+}
+
+#define	dtohl(x)	(android_swap_long(x))
+#define	dtohs(x)	(android_swap_short(x))
+#define	htodl(x)	(android_swap_long(x))
+#define	htods(x)	(android_swap_short(x))
+
+#endif
+
+#endif // _LIBS_UTILS_BYTE_ORDER_H