Implement hashing task.

Also get rid of the ShorFileRecordData and put the new LeanBase
class to use.

include/dindexer-machinery/scantask/hashing.hpp

@@ -0,0 +1,47 @@
+/* Copyright 2015, 2016, Michele Santullo
+ * This file is part of "dindexer".
+ *
+ * "dindexer" 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "dindexer" 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 "dindexer".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef idC7CC55298AC049EAA80604D6C7FD081D
+#define idC7CC55298AC049EAA80604D6C7FD081D
+
+#include "dindexer-machinery/scantask/leanbase.hpp"
+#include "dindexer-machinery/tiger.hpp"
+#include <vector>
+#include <memory>
+
+namespace mchlib {
+	struct FileRecordData;
+
+	namespace scantask {
+		class Hashing : public LeanBase<std::vector<FileRecordData>> {
+		public:
+			typedef LeanBase<std::vector<FileRecordData>> FileTreeBase;
+
+			Hashing ( std::shared_ptr<FileTreeBase> parFileTree, bool parIgnoreErrors );
+			virtual ~Hashing ( void ) noexcept;
+
+		private:
+			virtual void on_data_fill ( void ) override;
+			virtual std::vector<FileRecordData>& on_data_get ( void ) override;
+
+			std::shared_ptr<FileTreeBase> m_file_tree_task;
+			bool m_ignore_errors;
+		};
+	} //namespace scantask
+} //namespace mchlib
+
+#endif