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--- a/src/bincimapmime/mime-parsefull.cc
+++ b/src/bincimapmime/mime-parsefull.cc
@@ -339,8 +339,10 @@
     if (!delimiterqueue)
       continue;
 
-    delimiterqueue[delimiterpos++ % endpos] = c;
-
+    delimiterqueue[delimiterpos++] = c;
+    if (delimiterpos ==  endpos)
+      delimiterpos = 0;
+      
     if (compareStringToQueue(delimiterStr, delimiterqueue,
 			     delimiterpos, endpos)) {
       foundBoundary = true;
@@ -535,7 +537,6 @@
     boundaryqueue = new char[endpos];
     memset(boundaryqueue, 0, endpos);
   }
-  int boundarypos = 0;
 
   *boundarysize = 0;
 
@@ -543,6 +544,7 @@
   string line;
   bool toboundaryIsEmpty = (toboundary == "");
   char c;
+  int boundarypos = 0;
   while (mimeSource->getChar(&c)) {
     if (c == '\n') { ++*nbodylines; ++*nlines; }
 
@@ -550,7 +552,9 @@
       continue;
 
     // find boundary
-    boundaryqueue[boundarypos++ % endpos] = c;
+    boundaryqueue[boundarypos++] = c;
+    if (boundarypos == endpos)
+      boundarypos = 0;
       
     if (compareStringToQueue(_toboundaryStr, boundaryqueue,
 			     boundarypos, endpos)) {