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/**
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* Relational pipes
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* Copyright © 2022 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 <iomanip>
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#include <iostream>
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#include <sstream>
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#include <vector>
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#include <stdexcept>
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namespace relpipe {
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namespace in {
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namespace zeromq {
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class Hex {
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private:
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Hex() {
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}
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static char fromHex(wchar_t ch) {
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if (L'0' <= ch && ch <= L'9') return ch - L'0';
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else if (L'a' <= ch && ch <= L'f') return ch - L'a' + 10;
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else throw std::invalid_argument("Unable to decode hexadeximal string.");
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}
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public:
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static std::stringstream fromHex(const std::wstring& hex) {
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std::stringstream octets;
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char octet = 0;
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for (size_t i = 0, limit = hex.size(); i < limit; i++) {
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if (i % 2 == 0) {
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octet = fromHex(hex[i]) << 4;
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} else {
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octet += fromHex(hex[i]);
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octets.put(octet);
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}
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}
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return octets;
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}
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static std::wstring toHex(const std::string& octets) {
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std::wstring_convert < codecvt_utf8<wchar_t>> convertor; // TODO: do not create converter each time
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std::stringstream hex;
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hex << std::hex << std::setfill('0') << std::hex;
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for (size_t i = 0, size = octets.size(); i < size; i++) hex << std::setw(2) << (0xff & octets[i]);
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return convertor.from_bytes(hex.str());
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}
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static std::wstring toTxt(const std::string& octets, bool* validEncoding = nullptr) {
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std::wstring_convert < codecvt_utf8<wchar_t>> convertor; // TODO: do not create converter each time
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try {
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if (validEncoding) *validEncoding = true;
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// TODO: use encoding from the HTTP response headers instead of the constant one?
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return convertor.from_bytes(octets);
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} catch (...) {
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if (validEncoding) *validEncoding = false;
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std::stringstream filtered;
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for (char ch : octets) filtered << (ch >= ' ' && ch < 127 ? ch : '.');
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return convertor.from_bytes(filtered.str());
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}
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}
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};
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}
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}
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}
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