scintilla/gtk/Converter.h

   1 // Scintilla source code edit control
   2 // Converter.h - Encapsulation of iconv
   3 // Copyright 2004 by Neil Hodgson <neilh@scintilla.org>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 #ifndef CONVERTER_H
   7 #define CONVERTER_H
   8
   9 namespace Scintilla {
  10
  11 const GIConv iconvhBad = (GIConv)(-1);
  12 const gsize sizeFailure = static_cast<gsize>(-1);
  13 /**
  14  * Encapsulate g_iconv safely.
  15  */
  16 class Converter {
  17         GIConv iconvh = iconvhBad;
  18         void OpenHandle(const char *fullDestination, const char *charSetSource) noexcept {
  19                 iconvh = g_iconv_open(fullDestination, charSetSource);
  20         }
  21         bool Succeeded() const noexcept {
  22                 return iconvh != iconvhBad;
  23         }
  24 public:
  25         Converter() noexcept = default;
  26         Converter(const char *charSetDestination, const char *charSetSource, bool transliterations) {
  27                 Open(charSetDestination, charSetSource, transliterations);
  28         }
  29         // Deleted so Converter objects can not be copied.
  30         Converter(const Converter &) = delete;
  31         Converter(Converter &&) = delete;
  32         Converter &operator=(const Converter &) = delete;
  33         Converter &operator=(Converter &&) = delete;
  34         ~Converter() {
  35                 Close();
  36         }
  37         operator bool() const noexcept {
  38                 return Succeeded();
  39         }
  40         void Open(const char *charSetDestination, const char *charSetSource, bool transliterations) {
  41                 Close();
  42                 if (*charSetSource) {
  43                         // Try allowing approximate transliterations
  44                         if (transliterations) {
  45                                 std::string fullDest(charSetDestination);
  46                                 fullDest.append("//TRANSLIT");
  47                                 OpenHandle(fullDest.c_str(), charSetSource);
  48                         }
  49                         if (!Succeeded()) {
  50                                 // Transliterations failed so try basic name
  51                                 OpenHandle(charSetDestination, charSetSource);
  52                         }
  53                 }
  54         }
  55         void Close() noexcept {
  56                 if (Succeeded()) {
  57                         g_iconv_close(iconvh);
  58                         iconvh = iconvhBad;
  59                 }
  60         }
  61         gsize Convert(char **src, gsize *srcleft, char **dst, gsize *dstleft) const noexcept {
  62                 if (!Succeeded()) {
  63                         return sizeFailure;
  64                 } else {
  65                         return g_iconv(iconvh, src, srcleft, dst, dstleft);
  66                 }
  67         }
  68 };
  69
  70 }
  71
  72 #endif