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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 STREAM_READER_H_INCLUDED
#define STREAM_READER_H_INCLUDED
#include "endian_str.h"
#include "tag.h"
#include "tag_compound.h"
#include <iosfwd>
#include <memory>
#include <stdexcept>
#include <utility>
namespace nbt
{
namespace io
{
///Exception that gets thrown when reading is not successful
class NBT_EXPORT input_error : public std::runtime_error
{
using std::runtime_error::runtime_error;
};
/**
* @brief Reads a named tag from the stream, making sure that it is a compound
* @param is the stream to read from
* @param e the byte order of the source data. The Java edition
* of Minecraft uses Big Endian, the Pocket edition uses Little Endian
* @throw input_error on failure, or if the tag in the stream is not a compound
*/
NBT_EXPORT std::pair<std::string, std::unique_ptr<tag_compound>> read_compound(std::istream& is, endian::endian e = endian::big);
/**
* @brief Reads a named tag from the stream
* @param is the stream to read from
* @param e the byte order of the source data. The Java edition
* of Minecraft uses Big Endian, the Pocket edition uses Little Endian
* @throw input_error on failure
*/
NBT_EXPORT std::pair<std::string, std::unique_ptr<tag>> read_tag(std::istream& is, endian::endian e = endian::big);
/**
* @brief Helper class for reading NBT tags from input streams
*
* Can be reused to read multiple tags
*/
class NBT_EXPORT stream_reader
{
public:
/**
* @param is the stream to read from
* @param e the byte order of the source data. The Java edition
* of Minecraft uses Big Endian, the Pocket edition uses Little Endian
*/
explicit stream_reader(std::istream& is, endian::endian e = endian::big) noexcept;
///Returns the stream
std::istream& get_istr() const;
///Returns the byte order
endian::endian get_endian() const;
/**
* @brief Reads a named tag from the stream, making sure that it is a compound
* @throw input_error on failure, or if the tag in the stream is not a compound
*/
std::pair<std::string, std::unique_ptr<tag_compound>> read_compound();
/**
* @brief Reads a named tag from the stream
* @throw input_error on failure
*/
std::pair<std::string, std::unique_ptr<tag>> read_tag();
/**
* @brief Reads a tag of the given type without name from the stream
* @throw input_error on failure
*/
std::unique_ptr<tag> read_payload(tag_type type);
/**
* @brief Reads a tag type from the stream
* @param allow_end whether to consider tag_type::End valid
* @throw input_error on failure
*/
tag_type read_type(bool allow_end = false);
/**
* @brief Reads a binary number from the stream
*
* On failure, will set the failbit on the stream.
*/
template<class T>
void read_num(T& x);
/**
* @brief Reads an NBT string from the stream
*
* An NBT string consists of two bytes indicating the length, followed by
* the characters encoded in modified UTF-8.
* @throw input_error on failure
*/
std::string read_string();
private:
std::istream& is;
int depth = 0;
const endian::endian endian;
};
template<class T>
void stream_reader::read_num(T& x)
{
endian::read(is, x, endian);
}
}
}
#endif // STREAM_READER_H_INCLUDED
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