initial code repo

[stor4nfv.git] / src / ceph / src / include / byteorder.h

diff --git a/src/ceph/src/include/byteorder.h b/src/ceph/src/include/byteorder.h
new file mode 100644 (file)
index 0000000..8674860
--- /dev/null
+++ b/src/ceph/src/include/byteorder.h
@@ -0,0 +1,103 @@
+// -*- 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 {
+  T v;
+  ceph_le<T>& operator=(T nv) {
+    v = mswab(nv);
+    return *this;
+  }
+  operator T() const { return mswab(v); }
+} __attribute__ ((packed));
+
+template<typename T>
+inline bool operator==(ceph_le<T> a, ceph_le<T> b) {
+  return a.v == b.v;
+}
+
+using ceph_le64 = ceph_le<__u64>;
+using ceph_le32 = ceph_le<__u32>;
+using ceph_le16 = ceph_le<__u16>;
+
+inline __u64 init_le64(__u64 x) {
+  return mswab<__u64>(x);
+}
+inline __u32 init_le32(__u32 x) {
+  return mswab<__u32>(x);
+}
+inline __u16 init_le16(__u16 x) {
+  return mswab<__u16>(x);
+}
+
+  /*
+#define cpu_to_le64(x) (x)
+#define cpu_to_le32(x) (x)
+#define cpu_to_le16(x) (x)
+  */
+#define le64_to_cpu(x) ((uint64_t)x)
+#define le32_to_cpu(x) ((__u32)x)
+#define le16_to_cpu(x) ((__u16)x)