Ticket #4209: stream-offset.patch

common/stream.cpp

@@ -68 +68 @@
         switch (whence) {
         case SEEK_END:
                 // SEEK_END works just like SEEK_SET, only 'reversed',
-                // i.e. from the end.
-                offs = _size - offs;
+                // i.e. from the end (Note: offs is negative).
+                offs = _size + offs;
                 // Fall through
         case SEEK_SET:
                 _ptr = _ptrOrig + offs;
@@ -204 +204 @@
 
         switch(whence) {
         case SEEK_END:
-                offset = size() - offset;
+                offset = size() + offset;
                 // fallthrough
         case SEEK_SET:
                 _pos = _begin + offset;