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-rw-r--r--Master/tlpkg/tlgs/Resource/Init/pdf_main.ps520
1 files changed, 102 insertions, 418 deletions
diff --git a/Master/tlpkg/tlgs/Resource/Init/pdf_main.ps b/Master/tlpkg/tlgs/Resource/Init/pdf_main.ps
index ded2782a13e..d7933700f73 100644
--- a/Master/tlpkg/tlgs/Resource/Init/pdf_main.ps
+++ b/Master/tlpkg/tlgs/Resource/Init/pdf_main.ps
@@ -1,4 +1,4 @@
-% Copyright (C) 2001-2021 Artifex Software, Inc.
+% Copyright (C) 2001-2020 Artifex Software, Inc.
% All Rights Reserved.
%
% This software is provided AS-IS with no warranty, either express or
@@ -26,12 +26,10 @@ userdict /GS_PDF_ProcSet undef
/#? //false def
% Test whether the current output device handles pdfmark.
+/.writepdfmarkdict 1 dict dup /pdfmark //null put readonly def
/.writepdfmarks { % - .writepdfmarks <bool>
- /PdfmarkCapable /GetDeviceParam .special_op {
- exch pop
- }{
- //false
- }ifelse
+ currentdevice //.writepdfmarkdict .getdeviceparams
+ mark eq { //false } { pop pop //true } ifelse
systemdict /DOPDFMARKS known or
} bind executeonly def
@@ -284,22 +282,12 @@ currentdict /runpdfstring .undef
{
systemdict /FirstPage known
systemdict /LastPage known or
- systemdict /PageList known or
+ systemdict /Pagelist known or
{
<</DisablePageHandler //true>> setpagedevice
} if
} bind def
-/EnablePageHandlerDevice
-{
- systemdict /FirstPage known
- systemdict /LastPage known or
- systemdict /PageList known or
- {
- <</DisablePageHandler //false>> setpagedevice
- } if
-} bind def
-
/runpdfbegin { % <file> runpdfbegin -
userdict begin
% It turns out that the PDF interpreter uses memory more
@@ -307,22 +295,20 @@ currentdict /runpdfstring .undef
% This is counter-intuitive, and we don't understand why it happens,
% but the improvement is significant.
/PDFTopSave save def
- <<
- /ProcessDSCComment //null
- /ProcessComment //null
- %% Bug #696487, allow dict stack to grow without limit, as these PDF
- %% files have stupidly deep gsave nesting and we need a dictionary per gsave
- %% at the moment.
- %% Remove ths if bug #696511 is ever completed (move ExtGstate parameters into gstate)
- /MaxDictStack -1
- %% Bug #696567, same customer as above. Ths time they have a file with a page whch has
- %% 447000 ExtGState references (all of which contain no gstate!) Because we allocate
- %% these on the stack, allow the stack to grow indefinitely in order to accomodate
- %% such stupid files. Also move these lines from the end of the routine, so that
- %% the increases are in place before we call odfopen, which will build the
- %% resources and needs this definition in place.
- /MaxOpStack -1
- >> setuserparams
+ <</ProcessDSCComment //null>> setuserparams
+ <</ProcessComment //null>> setuserparams
+ %% Bug #696487, allow dict stack to grow without limit, as these PDF
+ %% files have stupidly deep gsave nesting and we need a dictionary per gsave
+ %% at the moment.
+ %% Remove ths if bug #696511 is ever completed (move ExtGstate parameters into gstate)
+ <</MaxDictStack -1>> setuserparams
+ %% Bug #696567, same customer as above. Ths time they have a file with a page whch has
+ %% 447000 ExtGState references (all of hwch contain no gstate!) Because we allocate
+ %% these on the stack, allow the stack to grow indefinitely in order to accomodate
+ %% such stupid files. Also move these lines from the end of the routine, so that
+ %% the increases are in place before we call odfopen, which will build the
+ %% resources and needs this definition in place.
+ <</MaxOpStack -1>> setuserparams
//DisablePageHandlerDevice exec
@@ -337,6 +323,7 @@ currentdict /runpdfstring .undef
/CumulativePageCount currentpagedevice /PageCount get def
} bind executeonly def
+currentdict /DisablePageHandlerDevice undef
/runpdfpagerange { % - runpdfpagerange <firstpage#> <lastpage#>
/PortfolioPage where {
@@ -388,8 +375,9 @@ currentdict /runpdfstring .undef
2 2 pdfpagecount {
PDFPageList exch 1 put
} for
+ 1 pdfpagecount
QUIET not {
- (Processing even-numbered pages\n) print (1 through ) print pdfpagecount =only
+ (Processing even-numbered pages\n) print
(.) = flush
} if
} {
@@ -401,8 +389,9 @@ currentdict /runpdfstring .undef
1 2 pdfpagecount {
PDFPageList exch 1 put
} for
+ 1 pdfpagecount
QUIET not {
- (Processing odd-numbered pages\n) print (1 through ) print pdfpagecount =only
+ (Processing odd-numbered pages\n) print 1 index =only ( through ) print dup =only
(.) = flush
} if
} {
@@ -536,16 +525,10 @@ currentdict /runpdfstring .undef
dup /Page# exch store
QUIET not { (Page ) print dup //== exec flush } if
pdfgetpage
- dup //null ne {
- pdfshowpage
- } {
- PDFSTOPONERROR {
- /dopdfpages cvx /syntaxerror signalerror
- } {
- pop
- ( **** Error: Page #) pdfformaterror Page# 10 string cvs pdfformaterror
- ( not found.\n) pdfformaterror
- } ifelse
+ dup //null ne { pdfshowpage } {
+ ( **** Error: Page #) pdfformaterror Page# 10 string cvs pdfformaterror
+ ( not found.\n) pdfformaterror
+ /dopdfpages cvx /syntaxerror signalerror
} ifelse
}{
pop
@@ -571,12 +554,9 @@ currentdict /runpdfstring .undef
PDFTopSave restore
end % userdict
2 vmreclaim % couldn't hurt
- //EnablePageHandlerDevice exec
+ <</DisablePageHandler //false>> setpagedevice
} bind executeonly def
-currentdict /DisablePageHandlerDevice undef
-currentdict /EnablePageHandlerDevice undef
-
% Copy stream to an external temporary file and
% return the file name as PS name.
/copy_embedded_file {
@@ -910,25 +890,7 @@ pdfdict begin
{ % xref line tag was not /n
/f ne % verify that the tag was /f
{ /setxrefentry cvx /syntaxerror signalerror
- } {
- % Bug #703214 has a invalid initial xref table. The table entries are correct
- % but the subsection begins 1 7 instead of 0 7, which means the initial entry is
- % declared as object 1 instead of object 0. The file is incrementally updated
- % many times and every object *except* object 1 is redefined. Object 1 is
- % therefore defined as free and having an offset of 0. Acrobat can open this
- % without complaint! Because the PDF header is a comment line it is skipped
- % so Acrobat must simply be ignoring the free flag. We can't easily detect
- % this, but we can check for the generation number being the canonical
- % head of the free list. If it is, and the object number we have is not
- % zero, then pretend its not free.......
- dup 65535 eq {
- 2 index 0 ne {
- 0 3 1 roll
- //false setxrefentry
- 3 -1 roll pop
- } if
- }if
- }ifelse
+ } if
} ifelse
pop pop % pop <obj location> and <gen num>
% stack: <err count> <obj num>
@@ -1292,26 +1254,26 @@ currentdict /xref-char-dict undef
% to the parent field.
Trailer /Root knownoget {
/AcroForm knownoget {
- %% If we don't have a NeedAppearances entry, treat as if true.
- %% We know Acrobat always regenerates all annotations.
- dup /NeedAppearances knownoget not { //true } if {
- /NeedAppearances //true def
- dup
- /Fields knownoget {
- { oforce
- %% Make sure the entry from the Fields array is a dictionary
- %% Bug #692447.pdf has an array of nulls.
- dup type /dicttype eq {
- link_widget_annots
- }if
- pop
- } forall
- } if
- pop
- } {
- pop
- } ifelse
- } if
+ %% If we don't have a NeedAppearances entry, treat as if true.
+ %% We know Acrobat always regenerates all annotait
+ dup /NeedAppearances knownoget not { //true } if {
+ /NeedAppearances //true def
+ dup
+ /Fields knownoget {
+ { oforce
+ %% Make sure the entry from the Fields array is a dictionary
+ %% Bug #692447.pdf has an array of nulls.
+ dup type /dicttype eq {
+ link_widget_annots
+ }if
+ pop
+ } forall
+ } if
+ pop
+ } {
+ pop
+ } ifelse
+ } if
} if
% Use OutputIntent ICC profile
@@ -1465,15 +1427,14 @@ currentdict /xref-char-dict undef
% Guess whether the output device is a printer.
/Printed currentpagedevice /OutputFile known def
} ifelse
- % If the file name has an odd number of '%', it is either a request for
- % separate pages, or is invalid. In either case some marks can be omitted.
- currentpagedevice /OutputFile .knownget {
- //false exch {
- 37 eq xor
- } forall {
+ currentpagedevice /OutputFile known {
+ currentpagedevice /OutputFile get (%d) search {
+ pop pop pop
/NO_PDFMARK_OUTLINES //true def
/NO_PDFMARK_DESTS //true def
- } if
+ } {
+ pop
+ }ifelse
} if
/PSLevel1 where { pop } { /PSLevel1 //false def } ifelse
% NB: PDFfile is used outside of the PDF code to determine that a
@@ -1618,9 +1579,10 @@ currentdict /xref-char-dict undef
% Check for recursion in the page tree. Bug 689954, MOAB-06-01-2007
% Make sure that the operand stack is cleaned up in case there's
% an error and we ignore it (bug #700953)
- /StackMarkVerifyPageTree
+ mark
verify_page_tree
- /StackMarkVerifyPageTree ClearToKey
+ cleartomark
+
currentdict end
} bind executeonly def
@@ -1961,6 +1923,7 @@ currentdict /xref-char-dict undef
}ifelse
}{
% No Page Resources, recursively try ParentResources as a last resort
+ pop % page Resources
LocalResources parent_obj_get
} ifelse
} {
@@ -2008,8 +1971,7 @@ currentdict /xref-char-dict undef
% Get the total number of pages in the document.
/pdfpagecount % - pdfpagecount <int>
- {
- Trailer /Root knownoget {
+ { Trailer /Root knownoget {
/Pages knownoget {
dup /Count knownoget {
dup type /integertype eq { dup 0 le } { //true } ifelse {
@@ -2116,20 +2078,10 @@ currentdict /xref-char-dict undef
exch pop //null
0 1 3 index length 1 sub {
2 index exch get
- dup oforce
- dup //null eq {
- PDFSTOPONERROR {
- /pdffindpage? cvx /syntaxerror signalerror
- } {
- ( **** Error: Ignoring a null node in the Page tree.\n) pdfformaterror
- pop pop
- } ifelse
- } {
- dup /Kids known { /Count oget } { pop 1 } ifelse
+ dup oforce dup /Kids known { /Count oget } { pop 1 } ifelse
% Stack: index kids null noderef count
- dup 5 index ge { pop exch pop exit } if
- 5 -1 roll exch sub 4 1 roll pop
- } ifelse
+ dup 5 index ge { pop exch pop exit } if
+ 5 -1 roll exch sub 4 1 roll pop
} for exch pop
% Stack: index null|noderef
dup //null eq { pop pop 1 //null exit } if
@@ -2559,7 +2511,7 @@ end readonly def
2 index sub exch 3 index sub exch 4 2 roll pop pop
% stack: savedCTM <pdfpagedict> [Box] XImageable YImageable
2 index aload pop 2 index sub exch 3 index sub exch 4 2 roll pop pop
- 5 index /Rotate pget not { 0 } if cvi 90 idiv 1 and 0 ne { exch } if
+ 5 index /Rotate pget not { 0 } if 90 cvi idiv 1 and 0 ne { exch } if
% stack: savedCTM <pdfpagedict> [Box] XImageable YImageable XBox YBox
4 copy
3 -1 roll exch div 3 1 roll div .min
@@ -2695,11 +2647,7 @@ currentdict /PDF2PS_matrix_key undef
% Determine the number of spot colors used on the page. Note: This searches
% the pages resources. It may be high if a spot color is in a resource but
% is not actually used on the page.
- currentpagedevice /PageSpotColors known {
- /PageSpotColors 2 index countspotcolors
- userdict /PageSpotColors 2 index put
- def
- } if
+ currentpagedevice /PageSpotColors known { /PageSpotColors 2 index countspotcolors def } if
% If the user told us to use a named OutputIntent
systemdict /UseOutputIntent .knownget {
@@ -2753,30 +2701,6 @@ currentdict /PDF2PS_matrix_key undef
% Stack: pagedict currentpagedict installproc
/Install exch def
% Stack: pagedict currentpagedict
- % If the Overprint device flag is not /disable, check usage of OP/op
- /PageUsesOverprint //false def % assume we don't need OP simulation
- dup /Overprint get /disable ne
- % If the device suppports SpotColors (DeviceN device) we don't need simulation
- 1 index /PageSpotColors known
- not and
- /HighLevelDevice /GetDeviceParam .special_op {
- exch pop
- }{
- //false
- }ifelse
- not and % Only if not HighLevelDevice
- {
- % Overprint is /enable, so the device might need the overprint compositor
- % if it does not support spot colors, thus check if overprint is used so
- % overprint simulation can be done with the pdf14 compositor
- 1 index countspotcolors userdict exch /PageSpotColors exch put % save it in a known place
- 1 index pageusesoverprint
- 1 index /ProcessColorModel get /DeviceCMYK eq {
- PageSpotColors 0 gt % count of colorants NOT including CMYK
- and
- } if
- /PageUsesOverprint exch def % the page needs OP simulation so set device param.
- } if
pop currentdict end setpagedevice
} bind executeonly def
@@ -2845,46 +2769,18 @@ currentdict /PDF2PS_matrix_key undef
% and the result was set in the pagedevice dictionary. Use it rather than
% scanning again IF it is present. If the pdfshowpage_setup was not called
% (eg GSView 5) then it will not be present, so we must rescan.
- currentdict /PageUsesTransparency .knownget not {dup pageusestransparency} if
+ currentpagedevice /PageUsesTransparency .knownget not {dup pageusestransparency} if
dup /PDFusingtransparency exch def {
- % If the current device isn't CMYK, or if it is a device that supports transparency
+ % If the current device isn't CMYK, or if it is a device that (currently) supports transparency
% we don't need the special handling of Overprint transparency, so disable the checking.
-
- 4 dict begin % working directory to simplify
- currentpagedevice dup /Colors get
- /devColors exch def % put into our convenience dict
- dup /HaveTransparency .knownget not { //false } if
- /devSupportsTrans exch def % put into our convenience dict
- dup /Overprint get
- /SimOP exch def % put into our convenience dict
- SimOP /simulate eq
- exch /PageUsesOverprint .knownget not { //false } if
- and % both Overprint==/simulate and PageUsesOverprint
- {
- % Determine if the device needs the special pdf14 compositor push
- devColors 4 eq PageSpotColors 0 gt and % CMYK device, but device has spot colors
- devColors 4 lt % RGB or Gray device
- or
- } {
- //false % Overprint is not /simulate or PageUseOverprint is false
- } ifelse
- % Determine if the device needs SMask for Overprint
- SimOP /simulate eq {
- //true % we will need setupOPrtans for Compatible BM
- } {
- SimOP /enable eq
- devColors 4 ge % CMYK device
- and
- } ifelse
- devSupportsTrans not and % If device supports transparency (e.g. pdfwrite) then no setupOPtrans
- end % pop the convenience dict
+ currentpagedevice dup /Colors get 4 lt 1 index /SimulateOverprint get not or
+ exch /HaveTransparency .knownget not { //false } if or
+ % device needs special Oveprint handling
/setup_trans exch
- { /setupOPtrans } { /setupSMtrans } ifelse
+ { /setupSMtrans } { /setupOPtrans } ifelse
load def
-
% Show the page within a PDF 1.4 device filter.
- { -1 } { 0 } ifelse
- .pushpdf14devicefilter {
+ 0 .pushpdf14devicefilter {
/DefaultQstate qstate store % device has changed -- reset DefaultQstate
% If the page has a Group, enclose contents in transparency group.
% (Adobe Tech Note 5407, sec 9.2)
@@ -2912,31 +2808,7 @@ currentdict /PDF2PS_matrix_key undef
} {
/setup_trans { pop pop } def % no-op this if the page doesn't use transparency
% NB: original will be restored from PDFsave
- % The page doesn't use transparency, but if Overprint is /simulate, we may need to
- % push a pdf14devicefilter to handle the overprint simulation using the pdf14 device.
- currentpagedevice
- dup /Overprint get /simulate eq
- 1 index /PageSpotColors known
- not and
- exch /PageUsesOverprint .knownget not { //false } if
- and
- {
- % Show the page within a PDF 1.4 device filter for overprint_simulation.
- -1 .pushpdf14devicefilter {
- /DefaultQstate qstate store % device has changed -- reset DefaultQstate
- showpagecontents
- } stopped {
- % abort the transparency device
- .abortpdf14devicefilter
- /DefaultQstate qstate store % device has changed -- reset DefaultQstate
- stop
- } if
- { } settransfer % identity transfer during popdevice (put_image)
- .poppdf14devicefilter % NB: reset to DefaultQstate will also restore transfer function
- /DefaultQstate qstate store % device has changed -- reset DefaultQstate
- } {
- showpagecontents
- } ifelse
+ showpagecontents
} ifelse
.free_page_resources
% todo: mixing drawing ops outside the device filter could cause
@@ -3095,8 +2967,7 @@ currentdict /PDF2PS_matrix_key undef
} ifelse
} if
} if
- % default AcroForm to true to match Acrobat.
- //systemdict /ShowAcroForm .knownget { //true eq } { //true } ifelse {
+ //systemdict /ShowAcroForm .knownget { //true eq } { //false } ifelse {
Trailer /Root oget /AcroForm knownoget { draw_acro_form } if
} if
} bind executeonly def
@@ -3109,112 +2980,6 @@ currentdict /PDF2PS_matrix_key undef
dup { setcolorspace } //.internalstopped exec { pop /DeviceRGB } if
} bind executeonly def
-% returns true if OP or op is true in an ExtGState
-/pageusesoverprint { % <pagedict> pageusesoverprint <bool>
- dup //false exch {
- 4 dict 1 index resourceusesoverprint { pop not exit } if
- %% Check the current dictionary and its Parent (if any) to see
- %% if they both have stored object numbers. If they do then
- %% check the numbers, don't allow self-references.
- dup /Parent knownoget not { pop exit }
- {
- exch /.gs.pdfobj# .knownget
- {
- 1 index /.gs.pdfobj# .knownget {
- eq {
- pop exit
- }if
- }{
- pop
- }ifelse
- }if
- } ifelse
- } loop
- % Also check for transparency in the annotation (if not in resources).
- { pop //true } { annotsuseoverprint } ifelse
-} bind def
-
-% Check if Overprint (OP/op) is specified in an ExtGState dict
-/extgstateusesoverprint { % <gstate dict> extgstateusesoverprint <bool>
- //false exch % Assume no overprint
- dup //null eq {
- pop % bug 692050
- } {
- { % establish loop context
- dup /OP knownoget { { pop not exit } if } if
- dup /op knownoget { { pop not exit } if } if
- pop exit
- } loop
- } ifelse
-} bind def
-
-% Check if overprint is used in a Pattern
-/patternusesoverprint { % <Pattern dict> patternusesoverprint <bool>
- //false exch % Assume no overprint
- {
- 4 dict 1 index resourceusesoverprint { pop not exit } if
- dup /ExtGState knownoget { extgstateusesoverprint { pop not exit } if } if
- pop exit
- } loop
-} bind def
-
-% Check the Resources of a page or Form. Check for loops in the resource chain.
-/resourceusesoverprint { % <dict> <dict> resourceusesoverprint <bool>
- { % Use loop to provide an exitable context.
- /Resources knownoget not { 0 dict } if
- 2 copy .knownget {
- { % Some circular references may be missed because scanning stops
- % when the 1st overprint is found.
- ( **** File has circular references in resource dictionaries.\n)
- pdfformaterror
- } if
- pop //false exit
- } if
- 2 copy //true put % In the current chain.
- dup /ExtGState knownoget {
- //false exch
- { exch pop oforce extgstateusesoverprint { pop //true exit } if
- } forall
- { pop //true exit } if
- } if
- dup /Pattern knownoget {
- //false exch
- { exch pop oforce patternusesoverprint { pop //true exit } if
- } forall
- { pop //true exit } if
- } if
- 2 copy //false put % Visited but not in the current chain.
- pop //false exit
- } loop
- exch pop
-} bind def
-
-% Check if the annotations on a page use overprint
-/annotsuseoverprint { % <page dict> annotsuseoverprint <bool>
- //false exch % Assume no overprint
- /Annots knownoget { % Get Annots array
- dup type /arraytype eq {
- {
- oforce
- dup //null ne {
- /AP knownoget { % Get appearance dict for the annoation
- /N knownogetdict { % Get the /N (i.e. normal) appearance stream
- 4 dict exch resourceusesoverprint { pop pop //true exit } if
- } if
- } if % If AP dict known
- } {
- pop
- } ifelse
- } forall % For all annots on the page
- } {
- ( **** Error: Annotation array is not an array, ignoring it.\n) pdfformaterror
- ( Output may be incorrect.\n) pdfformaterror
- pop
- }
- ifelse
- } if
-} bind def
-
% ------ Transparency support ------ %
% Determine whether a page might invoke any transparency features:
@@ -3397,37 +3162,31 @@ currentdict /PDF2PS_matrix_key undef
}
{
exch pop % remove the 'on error' marker
- dup type /dicttype eq {
- dup //null ne {
- dup /Subtype knownoget {
- /Highlight eq { % Highlight annotation is always implemented
- pop pop //true exit % as transparency.
- } if
+ dup //null ne {
+ dup /Subtype knownoget {
+ /Highlight eq { % Highlight annotation is always implemented
+ pop pop //true exit % as transparency.
} if
- dup /AP knownoget { % Get appearance dict for the annoation
- /N knownogetdict { % Get the /N (i.e. normal) appearance stream
- 4 dict exch resourceusestransparency { pop pop //true exit } if
- } if
- } if % If AP dict known
- dup /BM knownoget {
- pop pop pop //true exit
+ } if
+ dup /AP knownoget { % Get appearance dict for the annoation
+ /N knownogetdict { % Get the /N (i.e. normal) appearance stream
+ 4 dict exch resourceusestransparency { pop pop //true exit } if
} if
- dup /CA knownoget {
- 1 le {
- pop pop //true exit
- } if
+ } if % If AP dict known
+ dup /BM knownoget {
+ pop pop pop //true exit
+ } if
+ dup /CA knownoget {
+ 1 le {
+ pop pop //true exit
} if
- /ca knownoget {
- 1 le {
- pop //true exit
- } if
+ } if
+ /ca knownoget {
+ 1 le {
+ pop //true exit
} if
- } {
- pop
- } ifelse
+ } if
} {
- ( **** Error: Annotation entry is not a dictionary, ignoring it.\n) pdfformaterror
- ( Output may be incorrect.\n) pdfformaterror
pop
} ifelse
} ifelse
@@ -3454,32 +3213,21 @@ currentdict /PDF2PS_matrix_key undef
% Thus it may include Cyan, Magenta, Yellow, and Black.
% <colorspace> <spotcolordict> colorspacespotcolors -
/colorspacespotcolors {
- % Make sure we have an array, and that it is has enough info
- exch dup type /arraytype eq
- {
+ exch dup type /arraytype eq {
% If we have an Indexed color space then get the base space.
dup 0 oget % <<>> [csp] /Type
dup /Indexed eq {
pop 1 oget % <<>> [base]
2 copy exch colorspacespotcolors
} {
- dup /Pattern eq {
- 1 index length 1 gt { % only uncolored patterns have colorspace
- pop 1 oget % <<>> [base]
- 2 copy exch colorspacespotcolors
+ % Stack: <spotcolordict> <colorspace> <colorspacetype>
+ dup /Separation eq exch /DeviceN eq or {
+ dup 1 oget dup type /arraytype eq {
+ { oforce 2 index putspotcolor } forall
} {
- pop
+ 2 index putspotcolor
} ifelse
- } {
- % Stack: <spotcolordict> <colorspace> <colorspacetype>
- dup /Separation eq exch /DeviceN eq or {
- dup 1 oget dup type /arraytype eq {
- { oforce 2 index putspotcolor } forall
- } {
- 2 index putspotcolor
- } ifelse
- } if
- } ifelse
+ } if
} ifelse
} if
pop pop
@@ -3899,70 +3647,6 @@ currentdict /PDF2PS_matrix_key undef
} if
} bind executeonly def
-% These functions can be used in error handling. It is not always possible to
-% use the PostScript sequence 'mark ..... cleartomark' to clean up behind a
-% sequence of operations, because processing the PDF might leave a mark
-% object on the stack. There are a number of ways to address that problem; one
-% is to count the objects on the stack at the time and store that value in a
-% convenient dictionary, presented here is an alternative. Instead of using a
-% mark object, we can use a specific name object as if it were a mark object
-% and use the two routines below to count the number of objects on the stack
-% up to a specific key, and to clear the stack back to a named key.
-
-%
-% /key CountToKey false | int true
-%
-% Counts the operand stack backwards until it encounters
-% a specific name key on the stack. Returns true and the count
-% of objects on the stack after that key, or false if the key
-% was not found on the stack. Consumes the key passed
-% to CountToKey. Throws a typecheck if the operand is not
-% a name type.
-%
-/CountToKey
-{
- dup type /nametype eq {
- //false
- 0 1 count 5 sub
- {
- dup 3 add index
- 3 index eq
- {
- 3 1 roll pop pop //true exit
- }
- {pop} ifelse
- } for
-
- {
- //true
- }
- {
- pop //false
- } ifelse
- }
- {
- /CountToKey cvx /typecheck signalerror
- }ifelse
-}bind readonly def
-
-%
-% /key ClearToKey -
-%
-% Clears the operand stack backwards until it encounters
-% the name object passed as an operand. If the name object
-% is not present on the stack then it will clear the entire
-% stack. Like cleartomark this removes the 'key' from the stack.
-%
-/ClearToKey
-{
- 0 1 count 4 sub
- {
- pop
- dup 3 1 roll eq {exit} if
- } for
- pop
-}bind readonly def
-
end % pdfdict