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Add Base64, base64 encoding and decoding
author David Demelier <markand@malikania.fr>
date Thu, 11 Sep 2014 17:21:51 +0200
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1 /*
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2 * Base64.cpp -- base64 encoding and decoding
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3 *
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4 * Copyright (c) 2013, 2014 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <iterator>
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20 #include <sstream>
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21
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22 #include "Base64.h"
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23
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24 char Base64::lookup(int value) noexcept
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25 {
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26 static const char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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27
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28 return table[value];
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29 }
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30
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31 int Base64::rlookup(char ch)
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32 {
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33 if (ch == '+')
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34 return 62;
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35 if (ch == '/')
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36 return 63;
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37
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38 if (ch >= '0' && ch <= '9')
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39 return ch + 4;
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40 if (ch >= 'A' && ch <= 'Z')
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41 return ch - 65;
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42 if (ch >= 'a' && ch <= 'z')
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43 return ch - 71;
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44
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45 throw std::invalid_argument("not a valid base64 string");
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46 }
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47
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48 std::string Base64::encode(const std::string &input)
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49 {
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50 std::string result;
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51 std::istringstream iss(input, std::istringstream::in);
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52
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53 encode(std::istreambuf_iterator<char>(iss), std::istreambuf_iterator<char>(), std::back_inserter(result));
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54
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55 return result;
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56 }
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57
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58 std::string Base64::decode(const std::string &input)
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59 {
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60 std::string result;
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61 std::istringstream iss(input, std::istringstream::in);
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62
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63 decode(std::istreambuf_iterator<char>(iss), std::istreambuf_iterator<char>(), std::back_inserter(result));
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64
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65 return result;
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66 }