Bug 691121 - gs stops in interpreting tt instructions
Summary: gs stops in interpreting tt instructions
Status: RESOLVED FIXED
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: Font API (show other bugs)
Version: 8.71
Hardware: PC Linux
: P4 normal
Assignee: Ken Sharp
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-02-18 23:13 UTC by Andrey V. Panov
Modified: 2010-02-24 05:58 UTC (History)
0 users

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Customer:
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Attachments
testcase (8.27 KB, application/pdf)
2010-02-18 23:14 UTC, Andrey V. Panov 		Details
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Description Andrey V. Panov 2010-02-18 23:13:05 UTC 
gs stops in interpreting tt instructions of glyphs U+0419 (Й) or U+0439 (й) from the 
attached pdf file. This font is rendered by freetype, Adobe reader or MS Windows 
without issues. Here are error message:

GPL Ghostscript 8.71: Failed to interpret TT instructions for glyph index 8 of font 
Istok-Regular. Continue ignoring instructions of the font.
Comment 1 Andrey V. Panov 2010-02-18 23:14:19 UTC 
Created attachment 5969 [details]
testcase
Comment 2 Alex Cherepanov 2010-02-23 19:53:40 UTC 
This problem is already solved in the current version of FreeType.
An out-of-bounds request in Ins_MDRP() is silently ignored.

  static void Ins_MDRP( INS_ARG )
  {
    // [snip]
    if ( BOUNDS( point,      CUR.zp1.n_points ) ||
         BOUNDS( CUR.GS.rp0, CUR.zp0.n_points ) )
    {
      if ( CUR.pedantic_hinting )
        CUR.error = TT_Err_Invalid_Reference;
      return;
    }
    // snip  
}

Ghostscript should do the same and upgrade FreeType ASAP.
Comment 3 Ken Sharp 2010-02-24 00:28:41 UTC 
Alex, thanks for the analysis I'll try and add code to ignore the out of bounds
error. The version of FreeType in Subversion is pretty new, only a week or so
old, do we need a newer one ?
Comment 4 Alex Cherepanov 2010-02-24 05:42:44 UTC 
FreeType 2.3.12 has been released on 2010-Feb-13.
See http://freetype.sourceforge.net/index2.html
Comment 5 Ken Sharp 2010-02-24 05:58:15 UTC 
The released FT code is practically identical with the code in the source
repository. In fact the one in Subversion is probably better for our purposes,
since it includes a fix for TrueType fonts which was added after the release of
FreeType 2.3.12 and fixes several issues (see bug #690448)

Revision 10794 fixes this in the regular Ghostscript TrueType interpreter, patch
here:

http://ghostscript.com/pipermail/gs-cvs/2010-February/010542.html