1 files changed, 59 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/lib/dat/entry.hpp b/storage/mroonga/vendor/groonga/lib/dat/entry.hpp
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+++ b/storage/mroonga/vendor/groonga/lib/dat/entry.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2011-2016 Brazil
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License version 2.1 as published by the Free Software Foundation.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#pragma once
+
+#include "dat.hpp"
+
+namespace grn {
+namespace dat {
+
+// The most significant bit represents whether or not the entry is valid.
+// A valid entry stores the position of its associated key and an invalid entry
+// stores the index of the next invalid entry.
+class GRN_DAT_API Entry {
+ public:
+  Entry() : value_(0) {}
+
+  bool is_valid() const {
+    return (value_ & IS_VALID_FLAG) == IS_VALID_FLAG;
+  }
+  UInt32 key_pos() const {
+    GRN_DAT_DEBUG_THROW_IF(!is_valid());
+    return value_ & ~IS_VALID_FLAG;
+  }
+  UInt32 next() const {
+    GRN_DAT_DEBUG_THROW_IF(is_valid());
+    return value_;
+  }
+
+  void set_key_pos(UInt32 x) {
+    value_ = IS_VALID_FLAG | x;
+  }
+  void set_next(UInt32 x) {
+    value_ = x;
+  }
+
+ private:
+  UInt32 value_;
+
+  static const UInt32 IS_VALID_FLAG = 0x80000000U;
+};
+
+}  // namespace dat
+}  // namespace grn