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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

2 /Page# 0 def

3 /PDFSave null def

4 /DSCPageCount 0 def

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

7 /pdfshowpage_mysetpage {	% <pagedict> pdfshowpage_mysetpage <pagedict>

8   dup /CropBox pget {

9       boxrect

10       2 array astore /PageSize exch 4 2 roll

11       4 index /Rotate pget {

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

13       } if

14       exch neg exch 2 array astore /PageOffset exch

15       << 5 1 roll >> setpagedevice

16   } if

17 } bind def

19 runpdfbegin