[NTG-pdftex] Error with \pdfglyphtounicode when surrogatesare involved.

Ross Moore ross.moore at mq.edu.au
Wed May 31 10:03:37 CEST 2017

Hi Akira,

On May 31, 2017, at 2:59 PM, Akira Kakuto <kakuto at fuk.kindai.ac.jp<mailto:kakuto at fuk.kindai.ac.jp>> wrote:

Hi Karl,

I realize you're reporting a separate bug, that the value gets


<5A> <36E537DC81>

I confirmed that Ross's
\pdfglyphtounicode{Z}{D835 DC81}
with a space works ok.

In the case of
I encountered an assertion error because
long code = 0XD835DC81 < 0 in my case, where
sizeof(long) = 4.

Ross obtained erroneously vh = 0X36E537, vl = 0XDC81
because long code = 0XD835DC81 > 0, if sizeof(long) = 8.

Is assert(code >= 0 && code <= 0X10FFFF) OK or not OK?

I'm thinking this is OK, *provided* spaces are used to separate the codes,
when multiple glyphs are required.

Otherwise there should be just a single Unicode point, and the
allowable range for this is    <= 0X10FFFF  .
Indeed the top end of this  ( 0X100000 upwards ) is for “Private Use” only.

My understanding of these pieces of code:

    for (i = 0; i < l; i++) {
        if (p[i] == ' ')
            valid_unistr = 2;   /* if a space occurs we treat this entry as a string */

    if (valid_unistr == 2) {    /* a string with space(s) */
        /* copy p to buf2, ignoring spaces */
        for (q = buf2; *p != 0; p++)
            if (*p != ' ')
                *q++ = *p;
        *q = 0;
        gu->code = UNI_STRING;
        gu->unicode_seq = xstrdup(buf2);

  … is that blocks of 4-6 hex digits are just copied verbatim, without calling   check_unicode_value
so that  assert  is never actually encountered.

Do you agree with this interpretation?

(from tounicode.c)
static char *utf16be_str(long code)
  static char buf[SMALL_BUF_SIZE];
  long v;
  unsigned vh, vl;

  assert(code >= 0);

  if (code <= 0xFFFF)
      sprintf(buf, "%04lX", code);
  else {
      v = code - 0x10000;
      vh = v / 0x400 + 0xD800;
      vl = v % 0x400 + 0xDC00;
      sprintf(buf, "%04X%04X", vh, vl);
  return buf;




Dr Ross Moore
Mathematics Dept | 12 Wally’s Walk, 734
Macquarie University, NSW 2109, Australia
T: +61 2 9850 8955  |  F: +61 2 9850 8114
M:+61 407 288 255  |  E: ross.moore at mq.edu.au<mailto:ross.moore at mq.edu.au>


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