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+/*************************************************************************
+** HashFunction.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** 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; either version 3 of **
+** the License, or (at your option) any later version. **
+** **
+** 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, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#ifndef HASHFUNCTION_HPP
+#define HASHFUNCTION_HPP
+
+#include <memory>
+#include <string>
+#include <vector>
+
+/** Common base class for all hash functions. */
+class HashFunction {
+ public:
+ virtual ~HashFunction () =default;
+ virtual int digestSize () const =0;
+ virtual void reset () =0;
+ virtual void update (const char *data, size_t length) =0;
+ virtual void update (const std::string &data) =0;
+ virtual void update (const std::vector<uint8_t> &data) =0;
+ virtual std::vector<uint8_t> digestValue () const =0;
+ std::string digestString () const;
+ static std::vector<std::string> supportedAlgorithms ();
+ static bool isSupportedAlgorithm (const std::string &algo);
+ static std::unique_ptr<HashFunction> create (const std::string &name);
+ static std::unique_ptr<HashFunction> create (const std::string &name, const char *data, size_t length);
+ static std::unique_ptr<HashFunction> create (const std::string &name, const std::string &data);
+ static std::unique_ptr<HashFunction> create (const std::string &name, const std::vector<uint8_t> &data);
+};
+
+#endif