+#define GIBIBYTE_MIN_NBYTES 10000000000ULL
+#define MEBIBYTE_MIN_NBYTES 10000000ULL
+#define KIBIBYTE_MIN_NBYTES 10000ULL
+
+static unsigned
+get_unit(uint64_t total_bytes, const tchar **name_ret)
+{
+ if (total_bytes >= GIBIBYTE_MIN_NBYTES) {
+ *name_ret = T("GiB");
+ return 30;
+ } else if (total_bytes >= MEBIBYTE_MIN_NBYTES) {
+ *name_ret = T("MiB");
+ return 20;
+ } else if (total_bytes >= KIBIBYTE_MIN_NBYTES) {
+ *name_ret = T("KiB");
+ return 10;
+ } else {
+ *name_ret = T("bytes");
+ return 0;
+ }
+}
+