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/*************************************************************************
** VectorStream.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 VECTORSTREAM_HPP
#define VECTORSTREAM_HPP
#include <istream>
#include <vector>
template <typename T>
class VectorStreamBuffer : public std::streambuf
{
public:
VectorStreamBuffer (const std::vector<T> &v) {
if (v.empty())
_begin = _end = _curr = nullptr;
else {
_begin = _curr = &v[0];
_end = &v[0]+v.size();
}
}
protected:
int_type underflow () override {
return _curr == _end ? traits_type::eof() : traits_type::to_int_type(*_curr);
}
int_type uflow() override {
return _curr == _end ? traits_type::eof() : traits_type::to_int_type(*_curr++);
}
std::streamsize showmanyc () override {return _end-_curr;}
int_type pbackfail (int_type c) override {
if (_curr == _begin || (c != traits_type::eof() && c != _curr[-1]))
return traits_type::eof();
return traits_type::to_int_type(*--_curr);
}
pos_type seekoff (off_type off, std::ios_base::seekdir dir, std::ios_base::openmode which=std::ios_base::in) override {
switch (dir) {
case std::ios_base::cur:
_curr += off; break;
case std::ios_base::beg:
_curr = _begin+off; break;
case std::ios_base::end:
_curr = _end-off; break;
default:
break;
}
return _curr-_begin;
}
private:
const T *_begin;
const T *_end;
const T *_curr;
};
template <typename T>
class VectorInputStream : public std::istream
{
public:
VectorInputStream (const std::vector<T> &source) : std::istream(&_buf), _buf(source) {}
private:
VectorStreamBuffer<T> _buf;
};
#endif
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