From 9b03a1b4481ed48f8950c2cffd36112f67d6e183 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Thu, 19 Mar 2015 11:52:40 +0100
Subject: [PATCH] common: Add multi-platform endian conversion functions

This commit adds portable_endian.h file with set of endian conversion
functions.

Change-Id: I145cdc7c79eb9a16bd5199247af1976e18c59814
---
 src/common/portable_endian.h | 116 +++++++++++++++++++++++++++++++++++++++++++
 src/common/posix_acl_xattr.h |   1 +
 2 files changed, 117 insertions(+)
 create mode 100644 src/common/portable_endian.h

diff --git a/src/common/portable_endian.h b/src/common/portable_endian.h
new file mode 100644
index 0000000..e1d1d59
--- /dev/null
+++ b/src/common/portable_endian.h
@@ -0,0 +1,116 @@
+// "License": Public Domain
+// I, Mathias Panzenböck, place this file hereby into the public domain. Use it at your own risk for whatever you like.
+// In case there are jurisdictions that don't support putting things in the public domain you can also consider it to
+// be "dual licensed" under the BSD, MIT and Apache licenses, if you want to. This code is trivial anyway. Consider it
+// an example on how to get the endian conversion functions on different platforms.
+
+#pragma once
+
+#include "common/platform.h"
+
+#if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
+
+#define __WINDOWS__
+
+#endif
+
+#if defined(__linux__) || defined(__CYGWIN__)
+
+#include <endian.h>
+
+#elif defined(__APPLE__)
+
+#include <libkern/OSByteOrder.h>
+
+#define htobe16(x) OSSwapHostToBigInt16(x)
+#define htole16(x) OSSwapHostToLittleInt16(x)
+#define be16toh(x) OSSwapBigToHostInt16(x)
+#define le16toh(x) OSSwapLittleToHostInt16(x)
+
+#define htobe32(x) OSSwapHostToBigInt32(x)
+#define htole32(x) OSSwapHostToLittleInt32(x)
+#define be32toh(x) OSSwapBigToHostInt32(x)
+#define le32toh(x) OSSwapLittleToHostInt32(x)
+
+#define htobe64(x) OSSwapHostToBigInt64(x)
+#define htole64(x) OSSwapHostToLittleInt64(x)
+#define be64toh(x) OSSwapBigToHostInt64(x)
+#define le64toh(x) OSSwapLittleToHostInt64(x)
+
+#define __BYTE_ORDER    BYTE_ORDER
+#define __BIG_ENDIAN    BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#define __PDP_ENDIAN    PDP_ENDIAN
+
+#elif defined(__OpenBSD__)
+
+#include <sys/endian.h>
+
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
+
+#include <sys/endian.h>
+
+#define be16toh(x) betoh16(x)
+#define le16toh(x) letoh16(x)
+
+#define be32toh(x) betoh32(x)
+#define le32toh(x) letoh32(x)
+
+#define be64toh(x) betoh64(x)
+#define le64toh(x) letoh64(x)
+
+#elif defined(__WINDOWS__)
+
+#include <winsock2.h>
+#include <sys/param.h>
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+
+#define htobe16(x) htons(x)
+#define htole16(x) (x)
+#define be16toh(x) ntohs(x)
+#define le16toh(x) (x)
+
+#define htobe32(x) htonl(x)
+#define htole32(x) (x)
+#define be32toh(x) ntohl(x)
+#define le32toh(x) (x)
+
+#define htobe64(x) htonll(x)
+#define htole64(x) (x)
+#define be64toh(x) ntohll(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)
+
+#else
+
+#error byte order not supported
+
+#endif
+
+#define __BYTE_ORDER    BYTE_ORDER
+#define __BIG_ENDIAN    BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#define __PDP_ENDIAN    PDP_ENDIAN
+
+#else
+
+#error platform not supported
+
+#endif
diff --git a/src/common/posix_acl_xattr.h b/src/common/posix_acl_xattr.h
index 29c3543..c293dc9 100644
--- a/src/common/posix_acl_xattr.h
+++ b/src/common/posix_acl_xattr.h
@@ -8,6 +8,7 @@
 
 #include "common/exception.h"
 #include "common/massert.h"
+#include "common/portable_endian.h"
 
 // These #defines and structs were extracted from kernel sources
 
-- 
2.4.5

