format specific/unknown/unparsed/raw values in ASN1ContentHandler instead of in ASN1Reader
/**
* Relational pipes
* Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <sstream>
#include <iomanip>
#include "ASN1ContentHandler.h"
#include "XMLContentHandler.h"
namespace relpipe {
namespace in {
namespace asn1 {
namespace lib {
/**
* Converts ASN.1 events to XML SAX events.
*
* Does not need to know anything about the model/schema – works with generic events (nodes).
*/
class GenericASN1ContentHandler : public ASN1ContentHandler {
private:
XMLContentHandlerProxy handlers;
public:
void addHandler(std::shared_ptr<XMLContentHandler> handler) {
handlers.addHandler(handler);
}
virtual ~GenericASN1ContentHandler() {
}
void writeStreamStart() override {
handlers.writeStartElement("asn1");
}
void writeStreamEnd() override {
handlers.writeEndElement();
}
void writeCollectionStart(const Header& header) override {
if (header.tag == UniversalType::Sequence) handlers.writeStartElement("sequence");
else if (header.tag == UniversalType::Set) handlers.writeStartElement("set");
else if (header.tag == UniversalType::OctetString || header.tag == UniversalType::BitString) handlers.writeStartElement("encapsulated",{"type", std::to_string(header.tag)}); // TODO: type name, better attributes
else handlers.writeStartElement("constructed");
}
void writeCollectionEnd() override {
handlers.writeEndElement();
}
void writeBoolean(const Header& header, bool value) override {
handlers.writeStartElement("boolean");
handlers.writeCharacters(value ? "true" : "false");
handlers.writeEndElement();
}
void writeNull(const Header& header) override {
handlers.writeStartElement("null");
handlers.writeEndElement();
}
void writeInteger(const Header& header, Integer value) override {
handlers.writeStartElement("integer",{"hex", value.toHex()});
handlers.writeCharacters(value.toString());
handlers.writeEndElement();
}
void writeTextString(const Header& header, std::string value) override {
handlers.writeStartElement("text-string",{"type", std::to_string(header.tag)}); // TODO: type name, better attributes
handlers.writeCharacters(value);
handlers.writeEndElement();
}
void writeOctetString(const Header& header, std::string value) override {
std::stringstream hex;
hex << std::hex << std::setfill('0');
for (uint8_t b : value) hex << std::setw(2) << (int) b;
handlers.writeStartElement("octet-string",{"length", std::to_string(value.size())});
handlers.writeCharacters(hex.str());
handlers.writeEndElement();
}
void writeBitString(const Header& header, std::vector<bool> value) override {
std::stringstream bits;
for (bool b : value) bits << (int) b;
// for (bool b : value) bits << (b ? ':' : '.'); // TODO: configurable true/false symbols?
handlers.writeStartElement("bit-string",{"length", std::to_string(value.size())});
handlers.writeCharacters(bits.str());
handlers.writeEndElement();
}
void writeOID(const Header& header, ObjectIdentifier value) override {
// TODO: optionally expand into separate elements with additional metadata
handlers.writeStartElement("oid");
handlers.writeCharacters(value.toString());
handlers.writeEndElement();
}
void writeDateTime(const Header& header, DateTime value) override {
handlers.writeStartElement("date-time");
handlers.writeCharacters(value.toString());
handlers.writeEndElement();
}
void writeSpecific(const Header& header, std::string value) override {
std::stringstream hex;
hex << std::hex << std::setfill('0');
for (uint8_t b : value) hex << std::setw(2) << (int) b;
std::stringstream ascii;
for (uint8_t b : value) ascii << (b >= 32 && b < 127 ? (char) b : '.'); // TODO: configurable unsupported symbol?
handlers.writeStartElement("specific",{"length", std::to_string(value.size()), "hex", hex.str()});
handlers.writeCharacters(ascii.str());
handlers.writeEndElement();
}
};
}
}
}
}