pdftops/UTF8.h

   1 //========================================================================
   2 //
   3 // UTF8.h
   4 //
   5 // Copyright 2001-2003 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 static int mapUTF8(Unicode u, char *buf, int bufSize) {
  10   if        (u <= 0x0000007f) {
  11     if (bufSize < 1) {
  12       return 0;
  13     }
  14     buf[0] = (char)u;
  15     return 1;
  16   } else if (u <= 0x000007ff) {
  17     if (bufSize < 2) {
  18       return 0;
  19     }
  20     buf[0] = (char)(0xc0 + (u >> 6));
  21     buf[1] = (char)(0x80 + (u & 0x3f));
  22     return 2;
  23   } else if (u <= 0x0000ffff) {
  24     if (bufSize < 3) {
  25       return 0;
  26     }
  27     buf[0] = (char)(0xe0 + (u >> 12));
  28     buf[1] = (char)(0x80 + ((u >> 6) & 0x3f));
  29     buf[2] = (char)(0x80 + (u & 0x3f));
  30     return 3;
  31   } else if (u <= 0x0010ffff) {
  32     if (bufSize < 4) {
  33       return 0;
  34     }
  35     buf[0] = (char)(0xf0 + (u >> 18));
  36     buf[1] = (char)(0x80 + ((u >> 12) & 0x3f));
  37     buf[2] = (char)(0x80 + ((u >> 6) & 0x3f));
  38     buf[3] = (char)(0x80 + (u & 0x3f));
  39     return 4;
  40   } else {
  41     return 0;
  42   }
  43 }
  44
  45 static int mapUCS2(Unicode u, char *buf, int bufSize) {
  46   if (u <= 0xffff) {
  47     if (bufSize < 2) {
  48       return 0;
  49     }
  50     buf[0] = (char)((u >> 8) & 0xff);
  51     buf[1] = (char)(u & 0xff);
  52     return 2;
  53   } else {
  54     return 0;
  55   }
  56 }