bug#37719: Recent ghostscript broke preview-latex again

[Ikumi Keita]

Dear Ghostscript developers,

Thank you for your continuing work on developing gs.  Unfortunately, I
have to inform you that recent gs source became not compatible with
preview-latex again:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37719

I tried both gs 9.28 RC4 and fresh checkout of git repository of
ghostpdl.  I installed each of them with
env MAKE=gmake ./configure --prefix=$HOME/gs
gmake
gmake install
and set up the relavant path for this temporal installation, on FreeBSD
12.0 living in vmware on windows 10 home edition.  Then the invocation
of gs failed with a message quoted at the last of this message.

At the time of previous correspondence between us in this July,
preview-latex did work with gs 9.27 with patches suggested in
https://ghostscript.com/pipermail/gs-devel/2019-July/010161.html
applied, but it no longer does.  (By the way, the LaTeX developer
released new LaTeX this October, so the internal of the PDF file
produced by pdflatex might have some subtle difference from July.  I
attach the current PDF for reference.)

Could you please take a look and try to find a way to recover
preview-latex functionality?

Best regards,
Ikumi Keita

/home/keita/gs/bin/gs -dOutputFile\=\(bbb.prv/tmp0UabeI/pr1-1.png\) -q 
-dDELAYSAFER -dNOPAUSE -DNOPLATFONTS -dPrinted -dTextAlphaBits\=4 
-dGraphicsAlphaBits\=4 -sDEVICE\=png16m -r108.606x108.587 -dDELAYBIND
GS>{<</PermitFileReading[(bbb.pdf)(bbb.prv/tmp0UabeI/preview.dsc)]>> 
setuserparams .locksafe} stopped pop {DELAYSAFER{.setsafe}if}stopped 
pop/.preview-BP currentpagedevice/BeginPage get dup null eq{pop{pop}bind}if 
def<</BeginPage{currentpagedevice/PageSize get dup 0 get 1 ne exch 1 get 1 ne 
or{.preview-BP gsave 1 1 0.878431 setrgbcolor clippath fill grestore 
}{pop}ifelse}bind/PageSize[1 1]>>setpagedevice/preview-do{/.preview-ST[count 4 
roll save]def dup length 0 eq{pop}{setpagedevice}{ifelse 
exec}stopped{handleerror quit}if .preview-ST aload pop restore}bind def  
(bbb.prv/tmp0UabeI/preview.dsc)(r)file /.preview-ST 1 index def dup 0 
setfileposition 407()/SubFileDecode filter cvx exec .preview-ST dup dup 407 
setfileposition 51()/SubFileDecode filter cvx<<>>preview-do
Error: /invalidfileaccess in --file--
Operand stack:
   (bbb.prv/tmp0UabeI/preview.dsc)   (r)
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   
--nostringval--   2   %stopped_push   --nostringval--   --nostringval--   
%loop_continue   --nostringval--   --nostringval--   false   1   %stopped_push  
 .runexec2   --nostringval--   --nostringval--   --nostringval--   2   
%stopped_push   --nostringval--
Dictionary stack:
   --dict:1175/1684(ro)(G)--   --dict:0/20(G)--   --dict:78/200(L)--
Current allocation mode is local
Last OS error: Permission denied
Current file position is 606
GS<2>

bbb.pdf
Description: sample pdf file