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/*************************************************************************
** HashFunction.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2021 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 <istream>
#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> digestBytes () const =0;
void update (std::istream &is);
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
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