1 files changed, 51 insertions, 0 deletions
diff --git a/sql/sql_digest_stream.h b/sql/sql_digest_stream.h
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+/* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; version 2 of the License.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software Foundation,
+  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#ifndef SQL_DIGEST_STREAM_H
+#define SQL_DIGEST_STREAM_H
+
+#include "sql_digest.h"
+
+/**
+  State data storage for @c digest_start, @c digest_add_token.
+  This structure extends the @c sql_digest_storage structure
+  with temporary state used only during parsing.
+*/
+struct sql_digest_state
+{
+  /**
+    Index, in the digest token array, of the last identifier seen.
+    Reduce rules used in the digest computation can not
+    apply to tokens seen before an identifier.
+    @sa digest_add_token
+  */
+  int m_last_id_index;
+  sql_digest_storage m_digest_storage;
+
+  inline void reset(unsigned char *token_array, uint length)
+  {
+    m_last_id_index= 0;
+    m_digest_storage.reset(token_array, length);
+  }
+
+  inline bool is_empty()
+  {
+    return m_digest_storage.is_empty();
+  }
+};
+typedef struct sql_digest_state sql_digest_state;
+
+#endif
+