UTF32ToUTF8.c

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#include "libFireBird.h"
 
void UTF32ToUTF8(dword UTF32Character, byte *UTF8Character, byte *BytesPerChar)
{
  TRACEENTER();
 
  //Just 1 byte needed
  if(UTF32Character < 0x80)
  {
    if(UTF8Character) *UTF8Character = UTF32Character;
 
    if(BytesPerChar) *BytesPerChar = 1;
 
    TRACEEXIT();
    return;
  }
 
  //2 bytes needed
  if(UTF32Character < 0x800)
  {
 
    if(UTF8Character)
    {
      UTF8Character[0] = 0xc0 | ((UTF32Character >> 6) & 0x1f);
      UTF8Character[1] = 0x80 | (UTF32Character & 0x3f);
    }
 
    if(BytesPerChar) *BytesPerChar = 2;
 
    TRACEEXIT();
    return;
  }
 
  //3 bytes needed
  if(UTF32Character < 0x10000)
  {
 
    if(UTF8Character)
    {
      UTF8Character[0] = 0xe0 | ((UTF32Character >> 12) & 0x0f);
      UTF8Character[1] = 0x80 | ((UTF32Character >> 6) & 0x3f);
      UTF8Character[2] = 0x80 | (UTF32Character & 0x3f);
    }
 
    if(BytesPerChar) *BytesPerChar = 3;
 
    TRACEEXIT();
    return;
  }
 
  //4 bytes needed
  if(UTF8Character)
  {
    UTF8Character[0] = 0xf0 | ((UTF32Character >> 18) & 0x07);
    UTF8Character[1] = 0x80 | ((UTF32Character >> 12) & 0x3f);
    UTF8Character[1] = 0x80 | ((UTF32Character >> 6) & 0x3f);
    UTF8Character[2] = 0x80 | (UTF32Character & 0x3f);
  }
 
  if(BytesPerChar) *BytesPerChar = 4;
 
  TRACEEXIT();
}