ext/scintilla/gtk/Converter.h

   1 // Scintilla source code edit control\r
   2 // Converter.h - Encapsulation of iconv\r
   3 // Copyright 2004 by Neil Hodgson <neilh@scintilla.org>\r
   4 // The License.txt file describes the conditions under which this software may be distributed.\r
   5 \r
   6 #include <iconv.h>\r
   7 #if GTK_MAJOR_VERSION >= 2\r
   8         typedef GIConv ConverterHandle;\r
   9 #else\r
  10         typedef iconv_t ConverterHandle;\r
  11 #endif\r
  12 const ConverterHandle iconvhBad = (ConverterHandle)(-1);\r
  13 // Since various versions of iconv can not agree on whether the src argument\r
  14 // is char ** or const char ** provide a templatised adaptor.\r
  15 template<typename T>\r
  16 size_t iconv_adaptor(size_t(*f_iconv)(ConverterHandle, T, size_t *, char **, size_t *),\r
  17                 ConverterHandle cd, char** src, size_t *srcleft,\r
  18                 char **dst, size_t *dstleft) {\r
  19         return f_iconv(cd, (T)src, srcleft, dst, dstleft);\r
  20 }\r
  21 /**\r
  22  * Encapsulate iconv safely and avoid iconv_adaptor complexity in client code.\r
  23  */\r
  24 class Converter {\r
  25         ConverterHandle iconvh;\r
  26         void OpenHandle(const char *fullDestination, const char *charSetSource) {\r
  27 #if GTK_MAJOR_VERSION >= 2\r
  28                 iconvh = g_iconv_open(fullDestination, charSetSource);\r
  29 #else\r
  30                 iconvh = iconv_open(fullDestination, charSetSource);\r
  31 #endif\r
  32         }\r
  33         bool Succeeded() const {\r
  34                 return iconvh != iconvhBad;\r
  35         }\r
  36 public:\r
  37         Converter() {\r
  38                 iconvh = iconvhBad;\r
  39         }\r
  40         Converter(const char *charSetDestination, const char *charSetSource, bool transliterations) {\r
  41                 iconvh = iconvhBad;\r
  42                 Open(charSetDestination, charSetSource, transliterations);\r
  43         }\r
  44         ~Converter() {\r
  45                 Close();\r
  46         }\r
  47         operator bool() const {\r
  48                 return Succeeded();\r
  49         }\r
  50         void Open(const char *charSetDestination, const char *charSetSource, bool transliterations=true) {\r
  51                 Close();\r
  52                 if (*charSetSource) {\r
  53                         // Try allowing approximate transliterations\r
  54                         if (transliterations) {\r
  55                                 char fullDest[200];\r
  56                                 strcpy(fullDest, charSetDestination);\r
  57                                 strcat(fullDest, "//TRANSLIT");\r
  58                                 OpenHandle(fullDest, charSetSource);\r
  59                         }\r
  60                         if (!Succeeded()) {\r
  61                                 // Transliterations failed so try basic name\r
  62                                 OpenHandle(charSetDestination, charSetSource);\r
  63                         }\r
  64                 }\r
  65         }\r
  66         void Close() {\r
  67                 if (Succeeded()) {\r
  68 #if GTK_MAJOR_VERSION >= 2\r
  69                         g_iconv_close(iconvh);\r
  70 #else\r
  71                         iconv_close(iconvh);\r
  72 #endif\r
  73                         iconvh = iconvhBad;\r
  74                 }\r
  75         }\r
  76         size_t Convert(char** src, size_t *srcleft, char **dst, size_t *dstleft) const {\r
  77                 if (!Succeeded()) {\r
  78                         return (size_t)(-1);\r
  79                 } else {\r
  80 #if GTK_MAJOR_VERSION >= 2\r
  81                         return iconv_adaptor(g_iconv, iconvh, src, srcleft, dst, dstleft);\r
  82 #else\r
  83                         return iconv_adaptor(iconv, iconvh, src, srcleft, dst, dstleft);\r
  84 #endif\r
  85                 }\r
  86         }\r
  87 };\r