1 files changed, 87 insertions, 0 deletions
diff --git a/net/disk_cache/mem_rankings.cc b/net/disk_cache/mem_rankings.cc
new file mode 100644
index 0000000..13d1ccc
--- /dev/null
+++ b/net/disk_cache/mem_rankings.cc
@@ -0,0 +1,87 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "net/disk_cache/mem_rankings.h"
+
+#include "net/disk_cache/mem_entry_impl.h"
+
+namespace disk_cache {
+
+void MemRankings::Insert(MemEntryImpl* node) {
+  if (head_)
+    head_->set_prev(node);
+
+  if (!tail_)
+    tail_ = node;
+
+  node->set_prev(NULL);
+  node->set_next(head_);
+  head_ = node;
+}
+
+void MemRankings::Remove(MemEntryImpl* node) {
+  MemEntryImpl* prev = node->prev();
+  MemEntryImpl* next = node->next();
+
+  if (head_ == node)
+    head_ = next;
+
+  if (tail_ == node)
+    tail_ = prev;
+
+  if (prev)
+    prev->set_next(next);
+
+  if (next)
+    next->set_prev(prev);
+
+  node->set_next(NULL);
+  node->set_prev(NULL);
+}
+
+void MemRankings::UpdateRank(MemEntryImpl* node) {
+  Remove(node);
+  Insert(node);
+}
+
+MemEntryImpl* MemRankings::GetNext(MemEntryImpl* node) {
+  if (!node)
+    return head_;
+
+  return node->next();
+}
+
+MemEntryImpl* MemRankings::GetPrev(MemEntryImpl* node) {
+  if (!node)
+    return tail_;
+
+  return node->prev();
+}
+
+}  // namespace disk_cache