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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/ozlibstream.h"
#include "io/zlib_streambuf.h"
namespace zlib
{
deflate_streambuf::deflate_streambuf(std::ostream& output, size_t bufsize, int level, int window_bits, int mem_level, int strategy):
zlib_streambuf(bufsize), os(output)
{
int ret = deflateInit2(&zstr, level, Z_DEFLATED, window_bits, mem_level, strategy);
if(ret != Z_OK)
throw zlib_error(zstr.msg, ret);
setp(in.data(), in.data() + in.size());
}
deflate_streambuf::~deflate_streambuf() noexcept
{
try
{
close();
}
catch(...)
{
//ignore as we can't do anything about it
}
deflateEnd(&zstr);
}
void deflate_streambuf::close()
{
deflate_chunk(Z_FINISH);
}
void deflate_streambuf::deflate_chunk(int flush)
{
zstr.next_in = reinterpret_cast<Bytef*>(pbase());
zstr.avail_in = pptr() - pbase();
do
{
zstr.next_out = reinterpret_cast<Bytef*>(out.data());
zstr.avail_out = out.size();
int ret = deflate(&zstr, flush);
if(ret != Z_OK && ret != Z_STREAM_END)
{
os.setstate(std::ios_base::failbit);
throw zlib_error(zstr.msg, ret);
}
int have = out.size() - zstr.avail_out;
if(!os.write(out.data(), have))
throw std::ios_base::failure("Could not write to the output stream");
} while(zstr.avail_out == 0);
setp(in.data(), in.data() + in.size());
}
deflate_streambuf::int_type deflate_streambuf::overflow(int_type ch)
{
deflate_chunk();
if(ch != traits_type::eof())
{
*pptr() = ch;
pbump(1);
}
return ch;
}
int deflate_streambuf::sync()
{
deflate_chunk();
return 0;
}
void ozlibstream::close()
{
// Capture the exception mask so we can restore it if close() fails.
std::ios_base::iostate old_ex = exceptions();
try
{
buf.close();
return;
}
catch(...)
{
// fall through to mark the stream as bad
}
// Setting the stream state while exceptions are enabled may cause
// `setstate` to throw an `ios_base::failure` which would replace
// the original exception. Temporarily disable exceptions on this
// stream, set the `badbit`, then restore the exception mask.
exceptions(std::ios_base::goodbit);
setstate(std::ios_base::badbit);
try
{
exceptions(old_ex);
}
catch(...)
{
// If anything unexpected happens while restoring the exception mask,
// swallow it — we don't want this to throw here.
}
}
} // namespace zlib
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