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1 /** |
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2 * Relational pipes |
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3 * Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info) |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation, version 3 of the License. |
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8 * |
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9 * This program is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 * GNU General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU General Public License |
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15 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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16 */ |
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17 #pragma once |
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18 |
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19 #include <iomanip> |
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20 #include <iostream> |
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21 #include <sstream> |
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22 #include <vector> |
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23 #include <stdexcept> |
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24 |
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25 namespace relpipe { |
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26 namespace tr { |
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27 namespace http { |
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28 |
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29 class Hex { |
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30 private: |
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31 |
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32 Hex() { |
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33 } |
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34 |
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35 static char fromHex(wchar_t ch) { |
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36 if (L'0' <= ch && ch <= L'9') return ch - L'0'; |
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37 else if (L'a' <= ch && ch <= L'f') return ch - L'a' + 10; |
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38 else throw std::invalid_argument("Unable to decode hexadeximal string."); |
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39 } |
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40 |
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41 public: |
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42 |
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43 static std::stringstream fromHex(const std::wstring& hex) { |
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44 std::stringstream octets; |
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45 |
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46 char octet = 0; |
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47 |
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48 for (size_t i = 0, limit = hex.size(); i < limit; i++) { |
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49 if (i % 2 == 0) { |
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50 octet = fromHex(hex[i]) << 4; |
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51 } else { |
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52 octet += fromHex(hex[i]); |
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53 octets.put(octet); |
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54 } |
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55 } |
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56 |
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57 return octets; |
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58 } |
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59 |
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60 static std::wstring toHex(const std::string& octets) { |
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61 std::wstring_convert < codecvt_utf8<wchar_t>> convertor; // TODO: do not create converter each time |
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62 std::stringstream hex; |
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63 hex << std::hex << std::setfill('0') << std::hex; |
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64 for (size_t i = 0, size = octets.size(); i < size; i++) hex << std::setw(2) << (0xff & octets[i]); |
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65 return convertor.from_bytes(hex.str()); |
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66 } |
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67 |
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68 static std::wstring toTxt(const std::string& octets, bool* validEncoding = nullptr) { |
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69 std::wstring_convert < codecvt_utf8<wchar_t>> convertor; // TODO: do not create converter each time |
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70 try { |
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71 if (validEncoding) *validEncoding = true; |
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72 // TODO: use encoding from the HTTP response headers instead of the constant one? |
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73 return convertor.from_bytes(octets); |
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74 } catch (...) { |
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75 if (validEncoding) *validEncoding = false; |
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76 std::stringstream filtered; |
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77 for (char ch : octets) filtered << (ch >= ' ' && ch < 127 ? ch : '.'); |
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78 return convertor.from_bytes(filtered.str()); |
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79 } |
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80 } |
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81 }; |
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82 |
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83 } |
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84 } |
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85 } |