1 files changed, 12 insertions, 0 deletions
diff --git a/src/core/basetypes/MCRange.h b/src/core/basetypes/MCRange.h
index 7b8b497d..2687bcab 100644
--- a/src/core/basetypes/MCRange.h
+++ b/src/core/basetypes/MCRange.h
@@ -8,12 +8,24 @@
 
 namespace mailcore {
     
+    class IndexSet;
+    
+    // infinite length : UINT64_MAX
+    // empty range : location = UINT64_MAX
     struct Range {
         uint64_t location;
         uint64_t length;
     };
     
+    extern Range RangeEmpty;
+    
     Range RangeMake(uint64_t location, uint64_t length);
+    IndexSet * RangeRemoveRange(Range range1, Range range2);
+    IndexSet * RangeUnion(Range range1, Range range2);
+    Range RangeIntersection(Range range1, Range range2);
+    bool RangeHasIntersection(Range range1, Range range2);
+    uint64_t RangeLeftBound(Range range);
+    uint64_t RangeRightBound(Range range);
 }
 
 #endif