[libcalamares] Start deprecating signed sizes

src/libcalamares/utils/Units.h

@@ -17,6 +17,8 @@
 
 namespace CalamaresUtils
 {
+/// @brief Type for expressing units
+using intunit_t = quint64;
 
 namespace Units
 {
@@ -137,12 +139,19 @@ BytesToMiB( qint64 b )
     return int( b / 1024 / 1024 );
 }
 
+// TODO: deprecate signed version
 constexpr int
 BytesToGiB( qint64 b )
 {
     return int( b / 1024 / 1024 / 1024 );
 }
 
+constexpr intunit_t
+BytesToGiB( intunit_t b )
+{
+    return b / 1024 / 1024 / 1024;
+}
+
 constexpr qint64
 alignBytesToBlockSize( qint64 bytes, qint64 blocksize )
 {