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annotate C++/Converter.cpp @ 245:3c12f0e8bbb9

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Converter: add cstring missing Sockets: * Starts a PIMPL idiom to safely cast Socket with the future SocketSsl and be able to return a class of type "Socket" whilst the interface returns effectively a SocketSsl. * Rename some function to be more cute to use like getDomain -> domain(). * SocketListener now owns completely sockets and must be moved to it, the dedicated function select() always return a socket owned by SocketListener. * Operation close is not needed anymore but the function stays in case it's needed.
author David Demelier <markand@malikania.fr>
date Sun, 28 Sep 2014 21:15:26 +0200
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1 /*
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2 * Converter.cpp -- iconv based converter
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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 <cerrno>
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20 #include <cstring>
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21 #include <string>
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22 #include <iterator>
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23 #include <memory>
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24 #include <string>
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25 #include <stdexcept>
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26 #include <vector>
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27
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28 #include <iconv.h>
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29
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30 #include "Converter.h"
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31
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32 struct Deleter {
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33 void operator()(iconv_t desc)
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34 {
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35 iconv_close(desc);
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36 }
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37 };
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38
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39 using Iconv = std::unique_ptr<std::remove_pointer<iconv_t>::type, Deleter>;
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40
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41 std::string Converter::convert(const char *from,
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42 const char *to,
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43 const std::string &input)
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44 {
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45 // No conversion if from and to are identical
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46 if (std::strcmp(from, to) == 0)
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47 return input;
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48
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49 // Try to open the conversion descriptor
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50 auto cd = iconv_open(to, from);
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51
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52 if (cd == (iconv_t)-1)
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53 throw std::invalid_argument(std::strerror(errno));
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54
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55 Iconv cv(cd);
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56 std::size_t insize(input.size());
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57 std::size_t outsize(insize);
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58 std::vector<char> result(insize + 1);
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59
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60 auto *b = &input[0];
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61 auto *p = &result[0];
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62
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63 while (insize > 0) {
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64 /* Convert */
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65 auto r = iconv(cv.get(), &b, &insize, &p, &outsize);
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66
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67 if (r == (size_t)-1) {
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68 switch (errno) {
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69 case EBADF:
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70 case EILSEQ:
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71 case EINVAL:
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72 throw std::invalid_argument(std::strerror(errno));
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73 case E2BIG:
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74 /*
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75 * Here, we need to reallocate more data because the output
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76 * string may need more space.
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77 *
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78 * We use 16 as an optimistic value.
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79 */
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80
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81 result.reserve(result.size() + 16 + 1);
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82 p = &result[result.size()];
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83 outsize += 16;
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84 default:
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85 break;
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86 }
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87 }
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88
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89 }
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90
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91 return std::string(&result[0], (p - &result[0]));
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92 }