1 files changed, 57 insertions, 0 deletions
diff --git a/mocktracer/src/utility.cpp b/mocktracer/src/utility.cpp
new file mode 100644
index 0000000..4a08d82
--- /dev/null
+++ b/mocktracer/src/utility.cpp
@@ -0,0 +1,57 @@
+#include "utility.h"
+#include <climits>
+
+namespace opentracing {
+BEGIN_OPENTRACING_ABI_NAMESPACE
+namespace mocktracer {
+
+// Converts swaps the endianness of a number.
+//
+// Taken from https://stackoverflow.com/a/105339/4447365
+template <typename T>
+static T SwapEndian(T u) {
+  static_assert(CHAR_BIT == 8, "CHAR_BIT != 8");
+
+  union {
+    T u;
+    unsigned char u8[sizeof(T)];
+  } source, dest;
+
+  source.u = u;
+
+  for (size_t k = 0; k < sizeof(T); k++)
+    dest.u8[k] = source.u8[sizeof(T) - k - 1];
+
+  return dest.u;
+}
+
+// Determines whether the architecture is big endian.
+//
+// Taken from https://stackoverflow.com/a/1001373/4447365
+static bool IsBigEndian() {
+  union {
+    uint32_t i;
+    char c[4];
+  } bint = {0x01020304};
+
+  return bint.c[0] == 1;
+}
+
+uint64_t SwapEndianIfBig(uint64_t x) {
+  if (IsBigEndian()) {
+    return SwapEndian(x);
+  } else {
+    return x;
+  }
+}
+
+uint32_t SwapEndianIfBig(uint32_t x) {
+  if (IsBigEndian()) {
+    return SwapEndian(x);
+  } else {
+    return x;
+  }
+}
+}  // namespace mocktracer
+END_OPENTRACING_ABI_NAMESPACE
+}  // namespace opentracing