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From: Ken Sharp <ken.sharp@artifex.com>
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Date: Tue, 21 Nov 2017 16:46:18 +0000 (+0000)
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Subject: PS interpreter - restore the flushpage operator
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PS interpreter - restore the flushpage operator
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Michael Katzmann, working at the Library of Congress, is using
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Ghostscript in a custom application, which also involves a barcode
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reader and an SQL database.
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Currently this resides in an RPM at:
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http://engineering.nlsbph.org/repo/fedora/fedora/updates/27/SRPMS/AddressCard-3.17-LoC.fc27.src.rpm
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but its not usable without the barcode reader and SQL database....
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For reasons which are not completely clear to me, he wants to use
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flushpage to update the display part way through the operation.
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We suspect that it would be possible to avoid this, but it would
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probably require some programming effort on the users part, and since
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flushpage doesn't look like a likely candidate for abuse, we've decided
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just to restore it.
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https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=19ebb5f1f497b6f2d50fe13d17d3e627dfb6c868
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---
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diff -up ghostscript-9.07/Resource/Init/gs_init.ps.restore_flushpage ghostscript-9.07/Resource/Init/gs_init.ps
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--- ghostscript-9.07/Resource/Init/gs_init.ps.restore_flushpage 2018-11-28 14:07:09.976249454 +0100
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+++ ghostscript-9.07/Resource/Init/gs_init.ps 2018-11-28 14:08:41.225078430 +0100
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@@ -2144,7 +2144,7 @@ SAFER { .setsafe } if
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/.type1execchar /.type2execchar /.type42execchar /.setweightvector /.getuseciecolor /processcolors /.includecolorspace
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/.execn /.instopped /.stop /.stopped /.setcolorrendering /.setdevicecolorrendering /.buildcolorrendering1 /.builddevicecolorrendering1
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/.TransformPQR_scale_WB0 /.TransformPQR_scale_WB1 /.TransformPQR_scale_WB2 /.currentoverprintmode /.copydevice2
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-/.devicename /.doneshowpage /flushpage /.getbitsrect /.getdevice /.getdefaultdevice /.getdeviceparams /.gethardwareparams
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+/.devicename /.doneshowpage /.getbitsrect /.getdevice /.getdefaultdevice /.getdeviceparams /.gethardwareparams
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/makewordimagedevice /.outputpage /.putdeviceparams /.setdevice /.currentshowpagecount
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/.setpagedevice /.currentpagedevice /.knownundef /.setmaxlength /.rectappend /.initialize_dsc_parser /.parse_dsc_comments
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/.fillCIDMap /.fillIdentityCIDMap /.buildcmap /.filenamelistseparator /.libfile /.getfilename
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@@ -2162,6 +2162,15 @@ SAFER { .setsafe } if
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/.systemvmSFD /.settrapparams /.currentsystemparams /.currentuserparams /.getsystemparam /.getuserparam /.setsystemparams /.setuserparams
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/.checkpassword /.locale_to_utf8 /.currentglobal /.gcheck /.imagepath
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+% Used by a free user in the Library of Congress. Apparently this is used to
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+% draw a partial page, which is then filled in by the results of a barcode
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+% scanner and SQL database lookup. Its not clear to us exactly why this needs to be
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+% done as a partial page, but its easiest to restore the operator, and it seems like
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+% its a reasonably safe operator to restore, for the *very* few devices on which
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+% it will have any effect. Currently this uses the 'sync_outptu' device method
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+% to transfer the partial page, in future we may use a spec_op instead.
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+%/flushpage
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+
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% Used by our own test suite files
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%/.fileposition %image-qa.ps
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%/.makeoperator /.setCPSImode % gs_cet.ps
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