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/*************************************************************************
** StreamReader.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 STREAMREADER_HPP
#define STREAMREADER_HPP
#include <istream>
#include <string>
#include <vector>
#include "MessageException.hpp"
class HashFunction;
class StreamReader {
public:
explicit StreamReader (std::istream &is) : _is(&is) {}
virtual ~StreamReader () =default;
bool isStreamValid () const {return _is;}
bool eof () const {return _is->eof();}
void clearStream () {_is->clear();}
std::istream& replaceStream (std::istream &s);
uint32_t readUnsigned (int n);
uint32_t readUnsigned (int n, HashFunction &hashfunc);
int32_t readSigned (int n);
int32_t readSigned (int n, HashFunction &hashfunc);
std::string readString ();
std::string readString (HashFunction &hashfunc, bool finalZero=false);
std::string readString (int length);
std::string readString (int length, HashFunction &hashfunc);
std::vector<uint8_t> readBytes (int n);
std::vector<uint8_t> readBytes (int n, HashFunction &hash);
int readByte () {return _is->get();}
int readByte (HashFunction &hashfunc);
void seek (std::streampos pos, std::ios::seekdir dir) {_is->seekg(pos, dir);}
void seek (std::streampos pos) {_is->seekg(pos);}
std::streampos tell () const {return _is->tellg();}
int peek () const {return _is->peek();}
protected:
std::istream& getInputStream () {return *_is;}
private:
std::istream *_is;
};
struct StreamReaderException : public MessageException {
explicit StreamReaderException (const std::string &msg) : MessageException(msg) {}
};
#endif
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