src/types/IntegerDataTypeReader.h
author František Kučera <franta-hg@frantovo.cz>
Tue, 20 Oct 2020 23:48:51 +0200
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755978b0935c license: GNU GPLv3+
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/**
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ef99f5a6c9f6 license of protocol, reader and writer: GNU LGPLv3+ or GNU GPLv2+
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 * Relational pipes (library)
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 * Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the:
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 *  - GNU Lesser General Public License as published by the Free Software Foundation;
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 *    version 3 of the License or (at your option)
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 *  - GNU General Public License as published by the Free Software Foundation;
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 *    version 2 of the License.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <string>
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#include <iostream>
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#include <cassert>
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#include <limits>
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#include <relpipe/protocol/constants.h>
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#include "../../include/relpipe/reader/RelpipeReaderException.h"
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#include "../../include/relpipe/reader/typedefs.h"
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#include "../DataTypeReader.h"
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namespace relpipe {
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namespace reader {
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namespace types {
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using namespace relpipe::protocol;
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using namespace relpipe::reader;
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/**
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 * Signed variable-length integer.
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 * LEB128
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 */
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class IntegerDataTypeReader : public DataTypeReader<integer_t> {
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private:
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	octet_t readNextOctet(std::istream &input) {
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		octet_t value = input.get();
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		if (input.good()) return value;
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		else throw RelpipeReaderException(L"Unable to read next octet of the integer.");
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	}
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public:
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	IntegerDataTypeReader() : DataTypeReader<integer_t>(TypeId::INTEGER, DATA_TYPE_CODE_INTEGER) {
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	}
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	integer_t readValue(std::istream &input) override {
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		integer_t value = 0;
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		integer_t shift = 0;
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		octet_t octet;
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		do {
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			octet = readNextOctet(input);
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			value += integer_t(octet & 0x7F) << shift;
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			shift += 7;
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		} while (octet >= 128);
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		if ((shift < (sizeof (integer_t) * 8)) && (octet & 0x40))
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			value |= (~0 << shift);
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		return value;
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	}
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	string_t toString(const integer_t &value) override {
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		return std::to_wstring(value);
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	}
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};
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}
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}
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}