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-rw-r--r--mocktracer/src/utility.cpp57
1 files changed, 57 insertions, 0 deletions
diff --git a/mocktracer/src/utility.cpp b/mocktracer/src/utility.cpp
new file mode 100644
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+++ b/mocktracer/src/utility.cpp
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+#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