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/*
* SPDX-FileCopyrightText: 2013, 2015 ljfa-ag <ljfa-ag@web.de>
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
/*
* libnbt++ - A library for the Minecraft Named Binary Tag format.
* Copyright (C) 2013, 2015 ljfa-ag
*
* This file is part of libnbt++.
*
* libnbt++ 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 3 of the License, or
* (at your option) any later version.
*
* libnbt++ 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 libnbt++. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef IZLIBSTREAM_H_INCLUDED
#define IZLIBSTREAM_H_INCLUDED
#include "io/zlib_streambuf.h"
#include <istream>
#include <zlib.h>
namespace zlib
{
/**
* @brief Stream buffer used by zlib::izlibstream
* @sa izlibstream
*/
class NBT_EXPORT inflate_streambuf : public zlib_streambuf
{
public:
/**
* @param input the istream to wrap
* @param bufsize the size of the internal buffers
* @param window_bits the base two logarithm of the maximum window size
* that zlib will use. This parameter also determines which type of
* input to expect. The default argument will autodetect between zlib
* and gzip data. Refer to the zlib documentation of inflateInit2 for
* more details.
*
* @throw zlib_error if zlib encounters a problem during initialization
*/
explicit inflate_streambuf(std::istream& input, size_t bufsize = 32768,
int window_bits = 32 + 15);
~inflate_streambuf() noexcept;
///@return the wrapped istream
std::istream& get_istr() const
{
return is;
}
private:
std::istream& is;
bool stream_end;
int_type underflow() override;
};
/**
* @brief An istream adapter that decompresses data using zlib
*
* This istream wraps another istream. The izlibstream will read compressed
* data from the wrapped istream and inflate (decompress) it with zlib.
*
* @note If you want to read more data from the wrapped istream after the
* end of the compressed data, then it must allow seeking. It is unavoidable
* for the izlibstream to consume more data after the compressed data. It
* will automatically attempt to seek the wrapped istream back to the point
* after the end of the compressed data.
* @sa inflate_streambuf
*/
class NBT_EXPORT izlibstream : public std::istream
{
public:
/**
* @param input the istream to wrap
* @param bufsize the size of the internal buffers
*/
explicit izlibstream(std::istream& input, size_t bufsize = 32768)
: std::istream(&buf), buf(input, bufsize)
{
}
///@return the wrapped istream
std::istream& get_istr() const
{
return buf.get_istr();
}
private:
inflate_streambuf buf;
};
} // namespace zlib
#endif // IZLIBSTREAM_H_INCLUDED
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