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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) 2013-2015 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 } |
