src/lib/ASN1ContentHandler.h
author František Kučera <franta-hg@frantovo.cz>
Mon, 28 Jun 2021 22:48:04 +0200
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partial UTCTime support
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/**
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 * Relational pipes
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 * Copyright © 2021 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 GNU General Public License as published by
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 * the Free Software Foundation, version 3 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 <memory>
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#include <vector>
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#include <sstream>
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#include <iomanip>
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#include <cmath>
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namespace relpipe {
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namespace in {
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namespace asn1 {
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namespace lib {
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class ASN1ContentHandler {
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public:
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	enum class CollectionType : uint64_t {
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		Constructed, // TODO: special event?
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		Sequence = 16,
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		Set = 17
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	};
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	enum class StringType : uint64_t {
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		OctetString,
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		UTF8String,
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		NumericString,
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		PrintableString,
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		T61String,
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		VideotexString,
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		IA5String,
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		GraphicString,
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		VisibleString,
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		GeneralString,
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		UniversalString,
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		CharacterString,
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		BMPString,
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	};
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	enum class DateTimeType : uint64_t {
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		UTCTime,
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		GeneralizedTime,
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		Time,
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		Date,
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		TimeOfDay,
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		DateTime,
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		Duration,
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		// TODO: review date/time types
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	};
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	class Integer {
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	private:
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		// TODO: use std::string (of octets, not ASCII) instead of std::vector?
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		// TODO: use this class as BigInteger across Relational pipes?
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		std::vector<uint8_t> data;
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	public:
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		/**
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		 * @param data integer octets as in BER encoding
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		 */
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		Integer(std::vector<uint8_t> data) : data(data) {
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		}
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		virtual ~Integer() {
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		}
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		size_t size() const {
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			return data.size();
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		}
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		const uint8_t& operator[](std::size_t index) const {
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			return data[index];
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		}
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		const std::string toHex() const {
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			std::stringstream hex;
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			hex << std::hex << std::setfill('0');
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			for (uint8_t b : data) hex << std::setw(2) << (int) b;
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			return hex.str();
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		}
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		const std::string toString() const {
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			try {
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				return std::to_string(toInt64());
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			} catch (...) {
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				// integer has more than 64 bits → only HEX form value will be available
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				// TODO: support longer values than 64 bits
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				// TODO: do not ignore zero-length error?
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				return "";
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			}
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		}
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		const int64_t toInt64() const {
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			int64_t value = 0;
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			if (data.size() > sizeof (value)) throw std::invalid_argument("Integer is too long");
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			else if (data.size() == 0) throw std::invalid_argument("Integer has zero length");
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			value = data[0];
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			bool negative = data[0] & 0x80;
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			for (size_t i = 1, limit = data.size(); i < limit; i++) value = (value << 8) | data[i];
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			if (negative) value -= std::pow(256, data.size());
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			return value;
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		}
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	};
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	class ObjectIdentifier {
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	private:
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		// TODO: use std::string (of octets, not ASCII) instead of std::vector?
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		// TODO: use this class across Relational pipes as one of basic types?
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		std::vector<uint8_t> data;
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	public:
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		/**
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		 * @param data integer octets as in BER encoding
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		 */
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		ObjectIdentifier(std::vector<uint8_t> data) : data(data) {
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			// TODO: cache size and element values?
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		}
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		virtual ~ObjectIdentifier() {
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		}
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		/**
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		 * @return number of elements, not octets
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		 */
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		size_t size() const {
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			return 0; // FIXME: correct OID size
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		}
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		/**
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		 * @param index 0 = root element
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		 * @return value of the element at given position
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		 */
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		const uint8_t& operator[](std::size_t index) const {
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			return data[index]; // FIXME: correct OID value
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		}
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		const std::string toString() const {
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			if (data.size() == 0) return "";
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			std::stringstream result;
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			result << (data[0] / 40) << "." << (data[0] % 40); // first two elements are encoded in the first octet
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			for (size_t i = 1, limit = data.size(), octet = 0, element = 0; i < limit; i++) {
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				octet = data[i];
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				element = element << 7 | (octet & 0xFF >> 1);
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				// TODO: throw exception if the element value overflows? (should not happen) or format even longer values
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				if ((octet & 1 << 7) == 0) {
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					result << "." << element;
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					element = 0;
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				}
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			}
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			return result.str();
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		}
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	};
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	class DateTime {
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	public:
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		enum class Precision {
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			Year,
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			Month,
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			Day,
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			Hour,
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			Minute,
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			Second,
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			Milisecond,
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			Nanosecond
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		};
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		// TODO: timezone (in minutes or 1/4 hours)
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		Precision precision = Precision::Second;
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		int32_t year = 1970;
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		int8_t month = 1;
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		int8_t day = 1;
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		int8_t hour = 0;
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		int8_t minute = 0;
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		int8_t second = 0;
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		// TODO: ms/ns
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		virtual ~DateTime() {
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		}
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		const std::string toString() const {
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			std::stringstream result;
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			result << std::setfill('0');
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			result << std::setw(4) << (int) year;
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			result << "-" << std::setw(2) << (int) month;
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			result << "-" << std::setw(2) << (int) day;
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			result << "T" << std::setw(2) << (int) hour;
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			result << ":" << std::setw(2) << (int) minute;
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			result << ":" << std::setw(2) << (int) second;
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			result << "+00:00"; // TODO: timezone
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			return result.str();
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		}
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	};
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	virtual ~ASN1ContentHandler() = default;
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	// TODO: more metadata, support OID decoding and ASN.1 modules (schema), probably through a plug-in
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	// TODO: support also extension extractor plug-ins? (could decode some opaque structures like octet strings and replace them with nested elements) e.g. subjectAltName in https://datatracker.ietf.org/doc/html/rfc5280#section-4.2.1.6
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	virtual void writeStreamStart() = 0;
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	virtual void writeStreamEnd() = 0;
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	virtual void writeCollectionStart(CollectionType type) = 0;
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	virtual void writeCollectionEnd() = 0;
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	virtual void writeBoolean(bool value) = 0;
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	virtual void writeNull() = 0;
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	virtual void writeInteger(Integer value) = 0;
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	virtual void writeString(StringType type, std::string value) = 0;
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	virtual void writeOID(ObjectIdentifier value) = 0;
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	virtual void writeDateTime(DateTimeType type, DateTime value) = 0;
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	// Object descriptor
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	// virtual void writeReal(float value) = 0;
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	// Enumerated
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	// Embedded PVD
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	// Relative OID
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	// OID-IRI
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	// Relative OID-IRI
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1
2179f13227f4 AbstractParser: AbstractParser, ASN1Reader, ASN1ContentHandler, SAXContentHandler, BasicASN1Reader, DOMBuildingSAXContentHandler, GenericASN1ContentHandler skeletons
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};
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class ASN1ContentHandlerProxy : public ASN1ContentHandler {
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private:
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	std::vector<std::shared_ptr<ASN1ContentHandler>> handlers;
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public:
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	void addHandler(std::shared_ptr<ASN1ContentHandler> handler) {
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		handlers.push_back(handler);
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	}
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#define handler for (auto ___h : handlers) ___h
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	void writeStreamStart() override {
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		handler->writeStreamStart();
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	}
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	void writeStreamEnd() override {
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		handler->writeStreamEnd();
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	}
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	void writeCollectionStart(CollectionType type) override {
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		handler->writeCollectionStart(type);
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	}
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	void writeCollectionEnd() override {
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		handler->writeCollectionEnd();
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	}
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	void writeBoolean(bool value) override {
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		handler->writeBoolean(value);
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	}
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	void writeNull() override {
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		handler->writeNull();
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	}
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	void writeInteger(Integer value) override {
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		handler->writeInteger(value);
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	}
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	void writeString(StringType type, std::string value) override {
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		handler->writeString(type, value);
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	}
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	void writeOID(ObjectIdentifier value) override {
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		handler->writeOID(value);
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	}
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	void writeDateTime(DateTimeType type, DateTime value) override {
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		handler->writeDateTime(type, value);
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	}
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#undef handler
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};
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1
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}
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}
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}
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}