Index: base/sys_byteorder.h |
diff --git a/base/sys_byteorder.h b/base/sys_byteorder.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3d6004ae9700cff2cce58849f77bae7cd2b6631b |
--- /dev/null |
+++ b/base/sys_byteorder.h |
@@ -0,0 +1,75 @@ |
+// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+// This is a convenience header to pull in the platform-specific |
+// headers that define functions for byte-order conversion, |
+// particularly: ntohs(), htons(), ntohl(), htonl(). Prefer including |
+// this file instead of directly writing the #if / #else, since it |
+// avoids duplicating the platform-specific selections. |
+// This header also provides ntohll() and htonll() for byte-order conversion |
+// for 64-bit integers. |
+ |
+#ifndef BASE_SYS_BYTEORDER_H_ |
+#define BASE_SYS_BYTEORDER_H_ |
+ |
+#include "base/basictypes.h" |
+#include "build/build_config.h" |
+ |
+#if defined(OS_WIN) |
+#include <winsock2.h> |
+#else |
+#include <arpa/inet.h> |
+#endif |
+ |
+// Include headers to provide bswap for all platforms. |
eroman
2011/12/28 00:50:20
nit: "bswap" isn't very descriptive
Ilya Sherman
2011/12/28 01:20:02
Done.
|
+#if defined(COMPILER_MSVC) |
+#include <stdlib.h> |
+#elif defined(OS_MACOSX) |
+#include <libkern/OSByteOrder.h> |
+#elif defined(OS_OPENBSD) |
+#include <sys/endian.h> |
+#else |
+#include <byteswap.h> |
+#endif |
+ |
+ |
+namespace base { |
+ |
+// Returns a value with all bytes in |x| swapped, i.e. reverses the endianness. |
+inline uint64 ByteSwap(uint64 x) { |
+#if defined(COMPILER_MSVC) |
+ return _byteswap_uint64(x); |
+#elif defined(OS_MACOSX) |
+ return OSSwapInt64(x); |
+#elif defined(OS_OPENBSD) |
+ return swap64(x); |
+#else |
+ return bswap_64(x); |
+#endif |
+} |
+ |
+// Converts the bytes in |x| from network to host order (endianness), and |
+// returns the result. |
+inline uint64 ntohll(uint64 x) { |
+#if defined(ARCH_CPU_LITTLE_ENDIAN) |
+ return ByteSwap(x); |
+#else |
+ return x; |
+#endif |
+} |
+ |
+// Converts the bytes in |x| from host to network order (endianness), and |
+// returns the result. |
+inline uint64 htonll(uint64 x) { |
+#if defined(ARCH_CPU_LITTLE_ENDIAN) |
+ return ByteSwap(x); |
+#else |
+ return x; |
+#endif |
+} |
+ |
+} // namespace base |
+ |
+ |
+#endif // BASE_SYS_BYTEORDER_H_ |