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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/>.
*/
#include "io/izlibstream.h"
#include "io/zlib_streambuf.h"
namespace zlib
{
inflate_streambuf::inflate_streambuf(std::istream& input, size_t bufsize,
int window_bits)
: zlib_streambuf(bufsize), is(input), stream_end(false)
{
zstr.next_in = Z_NULL;
zstr.avail_in = 0;
int ret = inflateInit2(&zstr, window_bits);
if (ret != Z_OK)
throw zlib_error(zstr.msg, ret);
char* end = out.data() + out.size();
setg(end, end, end);
}
inflate_streambuf::~inflate_streambuf() noexcept
{
inflateEnd(&zstr);
}
inflate_streambuf::int_type inflate_streambuf::underflow()
{
if (gptr() < egptr())
return traits_type::to_int_type(*gptr());
size_t have;
do {
// Read if input buffer is empty
if (zstr.avail_in <= 0) {
is.read(in.data(), in.size());
if (is.bad())
throw std::ios_base::failure("Input stream is bad");
size_t count = is.gcount();
if (count == 0 && !stream_end)
throw zlib_error("Unexpected end of stream", Z_DATA_ERROR);
zstr.next_in = reinterpret_cast<Bytef*>(in.data());
zstr.avail_in = count;
}
zstr.next_out = reinterpret_cast<Bytef*>(out.data());
zstr.avail_out = out.size();
int ret = inflate(&zstr, Z_NO_FLUSH);
have = out.size() - zstr.avail_out;
switch (ret) {
case Z_NEED_DICT:
case Z_DATA_ERROR:
throw zlib_error(zstr.msg, ret);
case Z_MEM_ERROR:
throw std::bad_alloc();
case Z_STREAM_END:
if (!stream_end) {
stream_end = true;
// In case we consumed too much, we have to rewind the
// input stream
is.clear();
is.seekg(-static_cast<std::streamoff>(zstr.avail_in),
std::ios_base::cur);
}
if (have == 0)
return traits_type::eof();
break;
}
} while (have == 0);
setg(out.data(), out.data(), out.data() + have);
return traits_type::to_int_type(*gptr());
}
} // namespace zlib
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