1 files changed, 75 insertions, 0 deletions
diff --git a/comm/mailnews/db/mork/morkYarn.h b/comm/mailnews/db/mork/morkYarn.h
new file mode 100644
index 0000000000..e4cca8a843
--- /dev/null
+++ b/comm/mailnews/db/mork/morkYarn.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-  */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _MORKYARN_
+#define _MORKYARN_ 1
+
+#ifndef _MORK_
+#  include "mork.h"
+#endif
+
+// 456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#define morkDerived_kYarn /*i*/ 0x7952 /* ascii 'yR' */
+
+/*| morkYarn: a reference counted nsIMdbYarn C struct.  This is for use in those
+**| few cases where single instances of reference counted buffers are needed
+**| in Mork, and we expect few enough instances that overhead is not a factor
+**| in decided whether to use such a thing.
+|*/
+class morkYarn : public morkNode {  // refcounted yarn
+
+  // public: // slots inherited from morkNode (meant to inform only)
+  // nsIMdbHeap*       mNode_Heap;
+
+  // mork_base      mNode_Base;     // must equal morkBase_kNode
+  // mork_derived   mNode_Derived;  // depends on specific node subclass
+
+  // mork_access    mNode_Access;   // kOpen, kClosing, kShut, or kDead
+  // mork_usage     mNode_Usage;    // kHeap, kStack, kMember, kGlobal, kNone
+  // mork_able      mNode_Mutable;  // can this node be modified?
+  // mork_load      mNode_Load;     // is this node clean or dirty?
+
+  // mork_uses      mNode_Uses;     // refcount for strong refs
+  // mork_refs      mNode_Refs;     // refcount for strong refs + weak refs
+
+ public:  // state is public because the entire Mork system is private
+  mdbYarn mYarn_Body;
+
+  // { ===== begin morkNode interface =====
+ public:                                             // morkNode virtual methods
+  virtual void CloseMorkNode(morkEnv* ev) override;  // CloseYarn() only if open
+  virtual ~morkYarn();  // assert that CloseYarn() executed earlier
+
+ public:  // morkYarn construction & destruction
+  morkYarn(morkEnv* ev, const morkUsage& inUsage, nsIMdbHeap* ioHeap);
+  void CloseYarn(morkEnv* ev);  // called by CloseMorkNode();
+
+ private:  // copying is not allowed
+  morkYarn(const morkYarn& other);
+  morkYarn& operator=(const morkYarn& other);
+
+ public:  // dynamic type identification
+  mork_bool IsYarn() const {
+    return IsNode() && mNode_Derived == morkDerived_kYarn;
+  }
+  // } ===== end morkNode methods =====
+
+ public:  // typing
+  static void NonYarnTypeError(morkEnv* ev);
+
+ public:  // typesafe refcounting inlines calling inherited morkNode methods
+  static void SlotWeakYarn(morkYarn* me, morkEnv* ev, morkYarn** ioSlot) {
+    morkNode::SlotWeakNode((morkNode*)me, ev, (morkNode**)ioSlot);
+  }
+
+  static void SlotStrongYarn(morkYarn* me, morkEnv* ev, morkYarn** ioSlot) {
+    morkNode::SlotStrongNode((morkNode*)me, ev, (morkNode**)ioSlot);
+  }
+};
+
+// 456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789
+
+#endif /* _MORKYARN_ */