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/*
* Copyright (C) 2014 Tommi Maekitalo
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef TNT_CSTREAM
#define TNT_CSTREAM
#include <iostream>
#include <vector>
/// @cond internal
namespace tnt
{
class cstreambuf : public std::streambuf
{
typedef std::vector<char*> _chunks_type;
unsigned _chunksize;
_chunks_type _chunks;
public:
typedef _chunks_type::size_type size_type;
explicit cstreambuf(unsigned chunksize = 32768)
: _chunksize(chunksize)
{ }
~cstreambuf();
size_type chunkcount() const
{ return _chunks.size(); }
size_type size() const
{ return _chunks.size() == 0 ? 0
: (_chunks.size() - 1) * _chunksize + pptr() - _chunks.back(); }
size_type chunksize(size_type n) const
{
return _chunks.size() == 0 ? 0
: n + 1 < _chunks.size() ? _chunksize
: n + 1 == _chunks.size() ? static_cast<size_type>(pptr() - _chunks.back())
: 0;
}
const char* chunk(size_type n) const
{ return _chunks[n]; }
void rollback(size_type n);
void makeEmpty();
private:
std::streambuf::int_type overflow(std::streambuf::int_type ch);
std::streambuf::int_type underflow();
int sync();
};
class ocstream : public std::ostream
{
cstreambuf _streambuf;
public:
typedef cstreambuf::size_type size_type;
explicit ocstream(unsigned chunksize = 32768)
: std::ostream(0),
_streambuf(chunksize)
{
init(&_streambuf);
}
size_type chunkcount() const
{ return _streambuf.chunkcount(); }
const char* chunk(size_type n) const
{ return _streambuf.chunk(n); }
size_type chunksize(size_type n) const
{ return _streambuf.chunksize(n); }
size_type size() const
{ return _streambuf.size(); }
void rollback(size_type n)
{ _streambuf.rollback(n); }
void makeEmpty()
{ _streambuf.makeEmpty(); }
std::string str() const;
void output(std::ostream& out) const;
};
}
#endif // TNT_CSTREAM
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