scintilla/src/UnicodeFromUTF8.h

   1 // Scintilla source code edit control
   2 /** @file UnicodeFromUTF8.h
   3  ** Lexer infrastructure.
   4  **/
   5 // Copyright 2013 by Neil Hodgson <neilh@scintilla.org>
   6 // This file is in the public domain.
   7
   8 #ifndef UNICODEFROMUTF8_H
   9 #define UNICODEFROMUTF8_H
  10
  11 #ifdef SCI_NAMESPACE
  12 namespace Scintilla {
  13 #endif
  14
  15 inline int UnicodeFromUTF8(const unsigned char *us) {
  16         if (us[0] < 0xC2) {
  17                 return us[0];
  18         } else if (us[0] < 0xE0) {
  19                 return ((us[0] & 0x1F) << 6) + (us[1] & 0x3F);
  20         } else if (us[0] < 0xF0) {
  21                 return ((us[0] & 0xF) << 12) + ((us[1] & 0x3F) << 6) + (us[2] & 0x3F);
  22         } else if (us[0] < 0xF5) {
  23                 return ((us[0] & 0x7) << 18) + ((us[1] & 0x3F) << 12) + ((us[2] & 0x3F) << 6) + (us[3] & 0x3F);
  24         }
  25         return us[0];
  26 }
  27
  28 #ifdef SCI_NAMESPACE
  29 }
  30 #endif
  31
  32 #endif