Add 'libnbtplusplus/' from commit '1a0ffe372f4da8408c5d08a36013536a3396b9e6'

git-subtree-dir: libnbtplusplus
git-subtree-mainline: 7fb132859fda54aa96bc9dd46d302b343eeb5a02
git-subtree-split: 1a0ffe372f4da8408c5d08a36013536a3396b9e6

1 files changed, 107 insertions, 0 deletions

diff --git a/libnbtplusplus/include/io/izlibstream.h b/libnbtplusplus/include/io/izlibstream.h
new file mode 100644
index 0000000000..c2a8e59b04
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+++ b/libnbtplusplus/include/io/izlibstream.h
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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