1 files changed, 120 insertions, 0 deletions
diff --git a/src/include/byteorder.h b/src/include/byteorder.h
new file mode 100644
index 000000000..4062c2d4c
--- /dev/null
+++ b/src/include/byteorder.h
@@ -0,0 +1,120 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+
+#pragma once
+
+#include <type_traits>
+#include "acconfig.h"
+#include "int_types.h"
+
+
+#ifdef __GNUC__
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint16_t), T>::type
+swab(T val) {
+  return __builtin_bswap16(val);
+}
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint32_t), T>::type
+swab(T val) {
+  return __builtin_bswap32(val);
+}
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint64_t), T>::type
+swab(T val) {
+  return __builtin_bswap64(val);
+}
+#else
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint16_t), T>::type
+swab(T val) {
+  return (val >> 8) | (val << 8);
+}
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint32_t), T>::type
+swab(T val) {
+  return (( val >> 24) |
+	  ((val >> 8)  & 0xff00) |
+	  ((val << 8)  & 0xff0000) | 
+	  ((val << 24)));
+}
+template<typename T>
+inline typename std::enable_if<sizeof(T) == sizeof(uint64_t), T>::type
+swab(T val) {
+  return (( val >> 56) |
+	  ((val >> 40) & 0xff00ull) |
+	  ((val >> 24) & 0xff0000ull) |
+	  ((val >> 8)  & 0xff000000ull) |
+	  ((val << 8)  & 0xff00000000ull) |
+	  ((val << 24) & 0xff0000000000ull) |
+	  ((val << 40) & 0xff000000000000ull) |
+	  ((val << 56)));
+}
+#endif
+
+// mswab == maybe swab (if not LE)
+#ifdef CEPH_BIG_ENDIAN
+template<typename T>
+inline T mswab(T val) {
+  return swab(val);
+}
+#else
+template<typename T>
+inline T mswab(T val) {
+  return val;
+}
+#endif
+
+template<typename T>
+struct ceph_le {
+private:
+  T v;
+public:
+  ceph_le<T>& operator=(T nv) {
+    v = mswab(nv);
+    return *this;
+  }
+  operator T() const { return mswab(v); }
+  friend inline bool operator==(ceph_le a, ceph_le b) {
+    return a.v == b.v;
+  }
+} __attribute__ ((packed));
+
+using ceph_le64 = ceph_le<__u64>;
+using ceph_le32 = ceph_le<__u32>;
+using ceph_le16 = ceph_le<__u16>;
+
+using ceph_les64 = ceph_le<__s64>;
+using ceph_les32 = ceph_le<__s32>;
+using ceph_les16 = ceph_le<__s16>;
+
+inline ceph_le64 init_le64(__u64 x) {
+  ceph_le64 v;
+  v = x;
+  return v;
+}
+inline ceph_le32 init_le32(__u32 x) {
+  ceph_le32 v;
+  v = x;
+  return v;
+}
+inline ceph_le16 init_le16(__u16 x) {
+  ceph_le16 v;
+  v = x;
+  return v;
+}
+
+inline ceph_les64 init_les64(__s64 x) {
+  ceph_les64 v;
+  v = x;
+  return v;
+}
+inline ceph_les32 init_les32(__s32 x) {
+  ceph_les32 v;
+  v = x;
+  return v;
+}
+inline ceph_les16 init_les16(__s16 x) {
+  ceph_les16 v;
+  v = x;
+  return v;
+}