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/*
* 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 <istream>
#include <vector>
#include <zlib.h>
namespace zlib
{
/**
* @brief Stream buffer used by zlib::izlibstream
* @sa izlibstream
*/
class inflate_streambuf : public std::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;
std::vector<char> in;
std::vector<char> out;
z_stream zstr;
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.
*
* @sa inflate_streambuf
*/
class 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;
};
}
#endif // IZLIBSTREAM_H_INCLUDED
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