Add 'libnbtplusplus/' from commit '1a0ffe372f4da8408c5d08a36013536a3396b9e6'

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

1 files changed, 122 insertions, 0 deletions

diff --git a/libnbtplusplus/src/io/stream_reader.cpp b/libnbtplusplus/src/io/stream_reader.cpp
new file mode 100644
index 0000000000..43032b1120
--- /dev/null
+++ b/libnbtplusplus/src/io/stream_reader.cpp
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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/stream_reader.h"
+#include "make_unique.h"
+#include "tag_compound.h"
+#include <istream>
+
+namespace nbt
+{
+	namespace io
+	{
+
+		static constexpr int MAX_DEPTH = 1024;
+
+		std::pair<std::string, std::unique_ptr<tag_compound>>
+		read_compound(std::istream& is, endian::endian e)
+		{
+			return stream_reader(is, e).read_compound();
+		}
+
+		std::pair<std::string, std::unique_ptr<tag>> read_tag(std::istream& is,
+															  endian::endian e)
+		{
+			return stream_reader(is, e).read_tag();
+		}
+
+		stream_reader::stream_reader(std::istream& is,
+									 endian::endian e) noexcept
+			: is(is), endian(e)
+		{
+		}
+
+		std::istream& stream_reader::get_istr() const
+		{
+			return is;
+		}
+
+		endian::endian stream_reader::get_endian() const
+		{
+			return endian;
+		}
+
+		std::pair<std::string, std::unique_ptr<tag_compound>>
+		stream_reader::read_compound()
+		{
+			if (read_type() != tag_type::Compound) {
+				is.setstate(std::ios::failbit);
+				throw input_error("Tag is not a compound");
+			}
+			std::string key = read_string();
+			auto comp = make_unique<tag_compound>();
+			comp->read_payload(*this);
+			return {std::move(key), std::move(comp)};
+		}
+
+		std::pair<std::string, std::unique_ptr<tag>> stream_reader::read_tag()
+		{
+			tag_type type = read_type();
+			std::string key = read_string();
+			std::unique_ptr<tag> t = read_payload(type);
+			return {std::move(key), std::move(t)};
+		}
+
+		std::unique_ptr<tag> stream_reader::read_payload(tag_type type)
+		{
+			if (++depth > MAX_DEPTH)
+				throw input_error("Too deeply nested");
+			std::unique_ptr<tag> t = tag::create(type);
+			t->read_payload(*this);
+			--depth;
+			return t;
+		}
+
+		tag_type stream_reader::read_type(bool allow_end)
+		{
+			int type = is.get();
+			if (!is)
+				throw input_error("Error reading tag type");
+			if (!is_valid_type(type, allow_end)) {
+				is.setstate(std::ios::failbit);
+				throw input_error("Invalid tag type: " + std::to_string(type));
+			}
+			return static_cast<tag_type>(type);
+		}
+
+		std::string stream_reader::read_string()
+		{
+			uint16_t len;
+			read_num(len);
+			if (!is)
+				throw input_error("Error reading string");
+
+			std::string ret(len, '\0');
+			is.read(&ret[0], len); // C++11 allows us to do this
+			if (!is)
+				throw input_error("Error reading string");
+			return ret;
+		}
+
+	} // namespace io
+} // namespace nbt