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annotate C++/Converter.cpp @ 217:1aceace80f61

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Driver: remove useless line
author David Demelier <markand@malikania.fr>
date Mon, 05 May 2014 22:36:57 +0200
parents 5bb5712d400f
children 3c12f0e8bbb9
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215
5bb5712d400f Converter: iconv based converter
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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 <string>
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21 #include <iterator>
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22 #include <memory>
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23 #include <string>
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24 #include <stdexcept>
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25 #include <vector>
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26
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27 #include <iconv.h>
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28
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29 #include "Converter.h"
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30
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31 struct Deleter {
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32 void operator()(iconv_t desc)
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33 {
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34 iconv_close(desc);
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35 }
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36 };
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37
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38 using Iconv = std::unique_ptr<std::remove_pointer<iconv_t>::type, Deleter>;
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39
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40 std::string Converter::convert(const char *from,
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41 const char *to,
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42 const std::string &input)
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43 {
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44 // No conversion if from and to are identical
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45 if (std::strcmp(from, to) == 0)
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46 return input;
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47
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48 // Try to open the conversion descriptor
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49 auto cd = iconv_open(to, from);
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50
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51 if (cd == (iconv_t)-1)
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52 throw std::invalid_argument(std::strerror(errno));
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53
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54 Iconv cv(cd);
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55 std::size_t insize(input.size());
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56 std::size_t outsize(insize);
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57 std::vector<char> result(insize + 1);
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58
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59 auto *b = &input[0];
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60 auto *p = &result[0];
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61
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62 while (insize > 0) {
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63 /* Convert */
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64 auto r = iconv(cv.get(), &b, &insize, &p, &outsize);
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65
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66 if (r == (size_t)-1) {
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67 switch (errno) {
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68 case EBADF:
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69 case EILSEQ:
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70 case EINVAL:
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71 throw std::invalid_argument(std::strerror(errno));
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72 case E2BIG:
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73 /*
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74 * Here, we need to reallocate more data because the output
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75 * string may need more space.
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76 *
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77 * We use 16 as an optimistic value.
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78 */
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79
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80 result.reserve(result.size() + 16 + 1);
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81 p = &result[result.size()];
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82 outsize += 16;
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83 default:
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84 break;
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85 }
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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 return std::string(&result[0], (p - &result[0]));
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91 }