1 files changed, 52 insertions, 0 deletions
diff --git a/src/core/basetypes/MCIterator.h b/src/core/basetypes/MCIterator.h
index 1e51caab..c919c70f 100644
--- a/src/core/basetypes/MCIterator.h
+++ b/src/core/basetypes/MCIterator.h
@@ -12,6 +12,7 @@
 
 #include <MailCore/MCArray.h>
 #include <MailCore/MCHashMap.h>
+#include <MailCore/MCIndexSet.h>
 #include <MailCore/MCAutoreleasePool.h>
 #include <string.h>
 
@@ -46,8 +47,59 @@ HashMapIterator __key##__value##__iterator = HashMapIteratorInit(__hashmap, true
 while (HashMapIteratorRun(&__key##__value##__iterator)) \
 while (HashMapIteratorNext(&__key##__value##__iterator, (Object **) &__key, (Object **) &__value))
 
+#define mc_foreachindexset(__variable, __indexset) \
+int64_t __variable; \
+mailcore::ArrayIterator __variable##__iterator = mailcore::IndexSetIteratorInit(__array); \
+for (; __variable = IndexSetIteratorValue(&__variable##__iterator), IndexSetIteratorIsValid(&__variable##__iterator) ; mailcore::IndexSetIteratorNext(&__variable##__iterator))
+
 namespace mailcore {
     
+    struct IndexSetIterator {
+        unsigned int rangeIndex;
+        unsigned int index;
+        Range * currentRange;
+        IndexSet * indexSet;
+    };
+    
+    static inline IndexSetIterator IndexSetIteratorInit(IndexSet * indexSet)
+    {
+        IndexSetIterator iterator = { 0, 0, NULL, indexSet };
+        if (indexSet->rangesCount() >= 1) {
+            iterator.currentRange = &indexSet->allRanges()[0];
+        }
+        return iterator;
+    }
+    
+    static inline bool IndexSetIteratorIsValid(IndexSetIterator * iterator)
+    {
+        return iterator->currentRange != NULL;
+    }
+    
+    static inline int64_t IndexSetIteratorValue(IndexSetIterator * iterator)
+    {
+        return iterator->currentRange == NULL ? -1 : iterator->currentRange->location + iterator->index;
+    }
+    
+    static inline bool IndexSetIteratorNext(IndexSetIterator * iterator)
+    {
+        iterator->index ++;
+        if (iterator->index >= iterator->currentRange->length) {
+            // switch to an other range
+            iterator->index = 0;
+            iterator->rangeIndex ++;
+            if (iterator->rangeIndex >= iterator->indexSet->rangesCount()) {
+                iterator->currentRange = NULL;
+                return false;
+            }
+            else {
+                return true;
+            }
+        }
+        else {
+            return true;
+        }
+    }
+    
     struct ArrayIterator {
         unsigned index;
         unsigned count;