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page: fix pdf prolog for ghostscript >= 9.27 (#296) Ghostscript 9.27 removed GS_PDF_ProcSet and pdfdict due to a security issue (see https://security-tracker.debian.org/tracker/CVE-2019-3839). This fix was contributed by @onyxperidot (see #279). Fixes #279
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 1 24c02865 2005-01-04 devnull "/Page null def\n"

 2 24c02865 2005-01-04 devnull "/Page# 0 def\n"

 3 24c02865 2005-01-04 devnull "/PDFSave null def\n"

 4 24c02865 2005-01-04 devnull "/DSCPageCount 0 def\n"

 5 05a4d855 2007-03-26 devnull "/DoPDFPage {dup /Page# exch store pdfgetpage pdfshowpage } def\n"

 6 24c02865 2005-01-04 devnull "\n"

 7 24c02865 2005-01-04 devnull "/pdfshowpage_mysetpage {	% <pagedict> pdfshowpage_mysetpage <pagedict>\n"

 8 24c02865 2005-01-04 devnull "  dup /CropBox pget {\n"

 9 24c02865 2005-01-04 devnull "      boxrect\n"

10 24c02865 2005-01-04 devnull "      2 array astore /PageSize exch 4 2 roll\n"

11 05a4d855 2007-03-26 devnull "      4 index /Rotate pget {\n"

12 05a4d855 2007-03-26 devnull "        dup 0 lt {360 add} if 90 idiv {exch neg} repeat\n"

13 05a4d855 2007-03-26 devnull "      } if\n"

14 05a4d855 2007-03-26 devnull "      exch neg exch 2 array astore /PageOffset exch\n"

15 24c02865 2005-01-04 devnull "      << 5 1 roll >> setpagedevice\n"

16 24c02865 2005-01-04 devnull "  } if\n"

17 24c02865 2005-01-04 devnull "} bind def\n"

18 24c02865 2005-01-04 devnull "\n"

19 01a29ffe 2019-12-09 crossd "runpdfbegin\n"