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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 "/Page null def\n"

2 "/Page# 0 def\n"

3 "/PDFSave null def\n"

4 "/DSCPageCount 0 def\n"

5 "/DoPDFPage {dup /Page# exch store pdfgetpage pdfshowpage } def\n"

6 "\n"

7 "/pdfshowpage_mysetpage {	% <pagedict> pdfshowpage_mysetpage <pagedict>\n"

8 "  dup /CropBox pget {\n"

9 "      boxrect\n"

10 "      2 array astore /PageSize exch 4 2 roll\n"

11 "      4 index /Rotate pget {\n"

12 "        dup 0 lt {360 add} if 90 idiv {exch neg} repeat\n"

13 "      } if\n"

14 "      exch neg exch 2 array astore /PageOffset exch\n"

15 "      << 5 1 roll >> setpagedevice\n"

16 "  } if\n"

17 "} bind def\n"

18 "\n"

19 "runpdfbegin\n"