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Diffstat (limited to 'Master/tlpkg/tlgs/lib/pdf_base.ps')
| -rw-r--r-- | Master/tlpkg/tlgs/lib/pdf_base.ps | 1052 |
1 files changed, 0 insertions, 1052 deletions
diff --git a/Master/tlpkg/tlgs/lib/pdf_base.ps b/Master/tlpkg/tlgs/lib/pdf_base.ps deleted file mode 100644 index b65f0bf1fcb..00000000000 --- a/Master/tlpkg/tlgs/lib/pdf_base.ps +++ /dev/null @@ -1,1052 +0,0 @@ -% Copyright (C) 1994-2006 Artifex Software, Inc. All rights reserved.
-%
-% This software is provided AS-IS with no warranty, either express or
-% implied.
-%
-% This software is distributed under license and may not be copied,
-% modified or distributed except as expressly authorized under the terms
-% of the license contained in the file LICENSE in this distribution.
-%
-% For more information about licensing, please refer to
-% http://www.ghostscript.com/licensing/. For information on
-% commercial licensing, go to http://www.artifex.com/licensing/ or
-% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
-% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
-
-% $Id: pdf_base.ps 8358 2007-11-10 17:20:49Z alexcher $
-% pdf_base.ps
-% Basic parser for PDF reader.
-
-% This handles basic parsing of the file (including the trailer
-% and cross-reference table), as well as objects, object references,
-% streams, and name/number trees; it doesn't include any facilities for
-% making marks on the page.
-
-/.setlanguagelevel where { pop 2 .setlanguagelevel } if
-.currentglobal true .setglobal
-/pdfdict where { pop } { /pdfdict 100 dict def } ifelse
-pdfdict begin
-
-% Define the name interpretation dictionary for reading values.
-/valueopdict mark
- (<<) cvn { mark } bind % don't push an actual mark!
- (>>) cvn { { .dicttomark } stopped {
- ( **** File has an unbalanced >> \(close dictionary\).\n)
- pdfformaterror
- } if
- } bind
- ([) cvn { mark } bind % ditto
- (]) cvn dup load
-% /true true % see .pdfexectoken below
-% /false false % ibid.
-% /null null % ibid.
- /F dup cvx % see Objects section below
- /R dup cvx % see Objects section below
- /stream dup cvx % see Streams section below
-.dicttomark readonly def
-
-% ------ Utilities ------ %
-
-% Define a scratch string. The PDF language definition says that
-% no line in a PDF file can exceed 255 characters, but this string
-% is also used to search for %PDF-, which needs 1024 characters.
-/pdfstring 1024 string def
-
-% Read the previous line of a file. If we aren't at a line boundary,
-% read the line containing the current position.
-% Skip any blank lines.
-/prevline % - prevline <startpos> <substring>
- { PDFfile fileposition dup () pdfstring
- 2 index 257 sub 0 .max PDFfile exch setfileposition
- { % Stack: initpos linepos line string
- PDFfile fileposition
- PDFfile 2 index readline pop
- dup length 0 gt
- { 3 2 roll 5 -2 roll pop pop 2 index }
- { pop }
- ifelse
- % Stack: initpos linepos line string startpos
- PDFfile fileposition 5 index ge { exit } if
- pop
- }
- loop pop pop 3 -1 roll pop
- } bind def
-
-% Handle the PDF 1.2 #nn escape convention when reading from a file.
-% This should eventually be done in C.
-/.pdffixname { % <execname> .pdffixname <execname'>
- PDFversion 1.2 ge {
- dup .namestring (#) search {
- name#escape cvn exch pop
- } {
- pop
- } ifelse
- } if
-} bind def
-/name#escape % <post> <(#)> <pre> name#escape <string>
-{ exch pop
- 1 index 2 () /SubFileDecode filter dup (x) readhexstring
- % Stack: post pre stream char t/f
- not { % tolerate, but complain about bad syntax
- pop closefile (#) concatstrings exch
- ( **** Warning: Invalid hex following '#' name escape, using literal '#' in name.\n)
- pdfformaterror
- } {
- exch closefile concatstrings
- exch 2 1 index length 2 sub getinterval
- } ifelse
- (#) search { name#escape } if concatstrings
-} bind def
-
-% Execute a file, interpreting its executable names in a given
-% dictionary. The name procedures may do whatever they want
-% to the operand stack.
-/.pdftokenerror { % <count> <opdict> <errtoken> .pdftokenerror -
- BXlevel 0 le {
- ( **** Unknown operator: ') pdfformaterror
- dup =string cvs pdfformaterror
- % Attempt a retry scan of the element after changing to PDFScanInvNum
- << /PDFScanInvNum true >> setuserparams
- =string cvs
- token pop exch pop dup type
- dup /integertype eq exch /realtype eq or {
- exch pop exch pop
- (', processed as number, value: ) pdfformaterror
- dup =string cvs pdfformaterror (\n) pdfformaterror
- << /PDFScanInvNum null >> setuserparams % reset to default scanning rules
- false % suppress any stack cleanup
- } {
- % error was non-recoverable with modified scanning rules
- ('\n) pdfformaterror
- true
- } ifelse
- } {
- true
- } ifelse
- { % clean up the operand stack if this was non-recoverable
- pop pop count exch sub { pop } repeat % pop all the operands
- } if
-} bind def
-/.pdfexectoken { % <count> <opdict> <exectoken> .pdfexectoken ?
- PDFDEBUG {
- pdfdict /PDFSTEPcount known not { pdfdict /PDFSTEPcount 1 .forceput } if
- PDFSTEP {
- pdfdict /PDFtokencount 2 copy .knownget { 1 add } { 1 } ifelse .forceput
- PDFSTEPcount 1 gt {
- pdfdict /PDFSTEPcount PDFSTEPcount 1 sub .forceput
- } {
- dup ==only
- ( step # ) print PDFtokencount =only
- ( ? ) print flush 1 false .outputpage
- (%stdin) (r) file 255 string readline {
- token {
- exch pop pdfdict /PDFSTEPcount 3 -1 roll .forceput
- } {
- pdfdict /PDFSTEPcount 1 .forceput
- } ifelse % token
- } {
- pop /PDFSTEP false def % EOF on stdin
- } ifelse % readline
- } ifelse % PDFSTEPcount > 1
- } {
- dup ==only () = flush
- } ifelse % PDFSTEP
- } if % PDFDEBUG
- 2 copy .knownget {
- exch pop exch pop exch pop exec
- } {
- % Normally, true, false, and null would appear in opdict
- % and be treated as "operators". However, there is a
- % special fast case in the PostScript interpreter for names
- % that are defined in, and only in, systemdict and/or
- % userdict: putting these three names in the PDF dictionaries
- % destroys this property for them, slowing down their
- % interpretation in all PostScript code. Therefore, we
- % check for them explicitly here instead.
- dup dup dup /true eq exch /false eq or exch /null eq or {
- exch pop exch pop //systemdict exch get
- } {
- % Hackish fix to detect missing whitespace after "endobj". Yet another
- % problem that (you guessed it!) Adobe Acrobat ignores silently
- 256 string cvs (endobj) anchorsearch {
- ( **** Missing whitespace after 'endobj'.\n) pdfformaterror
- exch pop cvn get exch pop exec
- } {
- .pdftokenerror
- } ifelse
- } ifelse
- } ifelse
-} bind def
-/PDFScanRules_true << /PDFScanRules true >> def
-/PDFScanRules_null << /PDFScanRules null >> def
-/.pdfrun { % <file> <opdict> .pdfrun -
- % Construct a procedure with the stack depth, file and opdict
- % bound into it.
- 1 index cvlit count 2 sub 3 1 roll mark
- /PDFScanRules .getuserparam //null eq {
- //PDFScanRules_true { setuserparams } 0 get % force PDF scanning mode
- mark 7 4 roll
- } {
- mark 5 2 roll
- } ifelse
- { % Stack: ..operands.. count opdict file
- { token } stopped {
- dup type /filetype eq { pop } if % pop the operand if it is restored
- ( **** Error reading a content stream. The page may be incomplete.\n)
- pdfformaterror
- //false
- } if {
- dup type /nametype eq {
- dup xcheck {
- .pdfexectoken
- } {
- .pdffixname
- exch pop exch pop PDFDEBUG {
- PDFSTEPcount 1 le {
- dup ==only ( ) print flush
- } if
- } if
- } ifelse
- } {
- exch pop exch pop PDFDEBUG {
- PDFSTEPcount 1 le {
- dup ==only ( ) print flush
- } if
- } if
- } ifelse
- } {
- (%%EOF) cvn cvx .pdfexectoken
- } ifelse
- }
- aload pop .packtomark cvx
- { loop } 0 get 2 packedarray cvx
- { stopped } 0 get
- /PDFScanRules .getuserparam //null eq {
- //PDFScanRules_null { setuserparams } 0 get % reset PDF scannig mode if it was off
- } if
- /PDFsource PDFsource
- { store { stop } if } aload pop .packtomark cvx
- /PDFsource 3 -1 roll store exec
-} bind def
-currentdict /PDFScanRules_true undef
-currentdict /PDFScanRules_null undef
-
-% Execute a file, like .pdfrun, for a marking context.
-% This temporarily rebinds LocalResources and DefaultQstate.
-/.pdfruncontext { % <resdict> <file> <opdict> .pdfruncontext -
- /.pdfrun load LocalResources DefaultQstate
- /LocalResources 7 -1 roll store
- /DefaultQstate qstate store
- 3 .execn
- /DefaultQstate exch store
- /LocalResources exch store
-} bind def
-
-% Get the depth of the PDF operand stack. The caller sets pdfemptycount
-% before calling .pdfrun or .pdfruncontext. It is initially set by
-% pdf_main, and is also set by any routine which changes the operand
-% stack depth (currently .pdfpaintproc, although there are other callers
-% of .pdfrun{context} which have not been checked for opstack depth.
-/.pdfcount { % - .pdfcount <count>
- count pdfemptycount sub
-} bind def
-
-% Read a token, but simply return false (no token read) in the case of an
-% error. This is messy because 'token' either may or may not pop its operand
-% if an error occurs, and because the return values are different depending
-% on whether the source is a file or a string. To avoid closing the file
-% check for '{' before trying 'token'.
-/token_nofail_dict mark
- ( ) { dup ( ) readstring pop pop } bind
- (\t) 1 index
- (\r) 1 index
- (\n) 1 index
- (\000) 1 index
- ({) { //null //true exit } bind
-.dicttomark def
-
-/token_nofail { % <file|string> token_nofail false
- % <file> token_nofail <token> true
- % <string> token_nofail <post> <token> true
- dup type /filetype eq {
- { dup ( ) .peekstring not { ({) } if
- //token_nofail_dict exch .knownget not {
- //null 1 index { token } .internalstopped exit
- } if
- exec
- } loop
- { % stack: source null [source]
- //null ne { pop } if pop //false
- } { % stack: source null ([post] token true | false)
- { 3 1 roll pop pop //true }
- { pop pop //false }
- ifelse
- } ifelse
- } {
- //null 1 index % stack: source null source
- { token } .internalstopped { % stack: source null [source]
- //null ne { pop } if pop //false
- } { % stack: source null ([post] token true | false)
- { 4 2 roll pop pop //true }
- { pop pop //false }
- ifelse
- } ifelse
- } ifelse
-} bind def
-
-currentdict /token_nofail_dict .undef
-
-% ================================ Objects ================================ %
-
-% Since we may have more than 64K objects, we have to use a 2-D array to
-% hold them (and the parallel Generations structure).
-/lshift 9 def
-/lnshift lshift neg def
-/lsubmask 1 lshift bitshift 1 sub def
-/lsublen lsubmask 1 add def
-/larray { % - larray <larray>
- [ [] ]
-} bind def
-/lstring { % - lstring <lstring>
- [ () ]
-} bind def
-/ltype { % <lseq> type <type>
- 0 get type
-} bind def
-/lget { % <lseq> <index> lget <value>
- dup //lsubmask and 3 1 roll //lnshift bitshift get exch get
-} bind def
-/lput { % <lseq> <index> <value> lput -
- 3 1 roll
- dup //lsubmask and 4 1 roll //lnshift bitshift get
- 3 1 roll put
-} bind def
-/llength { % <lseq> llength <length>
- dup length 1 sub dup //lshift bitshift
- 3 1 roll get length add
-} bind def
-% lgrowto assumes newlength > llength(lseq)
-/growto { % <string/array> <length> growto <string'/array'>
- 1 index type /stringtype eq { string } { array } ifelse
- 2 copy copy pop exch pop
-} bind def
-/lgrowto { % <lseq> <newlength> lgrowto <lseq'>
- dup //lsubmask add //lnshift bitshift dup 3 index length gt {
- % Add more sub-arrays. Start by completing the last existing one.
- % Stack: lseq newlen newtoplen
- 3 -1 roll dup llength 1 sub //lsubmask or 1 add lgrowto
- % Stack: newlen newtoplen lseq
- [ exch aload pop
- counttomark 2 add -1 roll % newtoplen
- counttomark sub { dup 0 0 getinterval lsublen growto } repeat
- dup 0 0 getinterval ] exch
- } {
- pop
- } ifelse
- % Expand the last sub-array.
- 1 sub //lsubmask and 1 add
- exch dup dup length 1 sub 2 copy
- % Stack: newsublen lseq lseq len-1 lseq len-1
- get 5 -1 roll growto put
-} bind def
-/lforall { % <lseq> <proc> lforall -
- /forall cvx 2 packedarray cvx forall
-} bind def
-
-% We keep track of PDF objects using the following PostScript variables:
-%
-% Generations (lstring): Generations[N] holds 1+ the current
-% generation number for object number N. (As far as we can tell,
-% this is needed only for error checking.) For free objects,
-% Generations[N] is 0.
-%
-% Objects (larray): If object N is loaded, Objects[N] is the actual
-% object; otherwise, Objects[N] is an executable integer giving
-% the file offset of the object's location in the file. If
-% ObjectStream[N] is non-zero then Objects[N] contains the index
-% into the object stream instead of the file offset of the object.
-%
-% ObjectStream (larray): If object N is in an object stream then
-% ObjectStream[N] holds the object number of the object stream.
-% Otherwise ObjectStream[N] contains 0. If ObjectStream[N]
-% is non-zero then Objects[N] contains the index into the object
-% stream.
-%
-% GlobalObjects (dictionary): If object N has been resolved in
-% global VM, GlobalObjects[N] is the same as Objects[N]
-% (except that GlobalObjects itself is stored in global VM,
-% so the entry will not be deleted at the end of the page).
-%
-% IsGlobal (lstring): IsGlobal[N] = 1 iff object N was resolved in
-% global VM. This is an accelerator to avoid having to do a
-% dictionary lookup in GlobalObjects when resolving every object.
-
-% Initialize the PDF object tables.
-/initPDFobjects { % - initPDFobjects -
- /ObjectStream larray def
- /Objects larray def
- /Generations lstring def
- .currentglobal true .setglobal
- /GlobalObjects 20 dict def
- .setglobal
- /IsGlobal lstring def
-} bind def
-
-% Grow the tables to a specified size.
-/growPDFobjects { % <minsize> growPDFobjects -
- dup ObjectStream llength gt {
- dup ObjectStream exch lgrowto /ObjectStream exch def
- } if
- dup Objects llength gt {
- dup Objects exch lgrowto /Objects exch def
- } if
- dup Generations llength gt {
- dup Generations exch lgrowto /Generations exch def
- } if
- dup IsGlobal llength gt {
- dup IsGlobal exch lgrowto /IsGlobal exch def
- } if
- pop
-} bind def
-
-% We represent an unresolved object reference by a procedure of the form
-% {obj# gen# resolveR}. This is not a possible PDF object, because PDF has
-% no way to represent procedures. Since PDF in fact has no way to represent
-% any PostScript object that doesn't evaluate to itself, we can 'force'
-% a possibly indirect object painlessly with 'exec'.
-% Note that since we represent streams by executable dictionaries
-% (see below), we need both an xcheck and a type check to determine
-% whether an object has been resolved.
-/resolved? { % <object#> resolved? <value> true
- % <object#> resolved? false
- Objects 1 index lget dup xcheck { % Check if executable
- dup type /integertype eq { % Check if an integer
- % Check whether the object is in GlobalObjects.
- pop IsGlobal 1 index lget 0 eq { % 0 --> Not in GlabalObjects
- pop false % The object is not resolved
- } { % The object is in GlobalObjects
- % Update Objects from GlobalObjects
- PDFDEBUG { (%Global=>local: ) print dup == } if
- GlobalObjects 1 index get dup Objects 4 1 roll lput true
- } ifelse
- } { % Else object is executable but not integer
- exch pop true % Therefore must be executable dict. (stream)
- } ifelse
- } { % Else object is not executable.
- exch pop true % Therefore it must have been resolved.
- } ifelse
-} bind def
-/oforce /exec load def
-/oget { % <array> <index> oget <object>
- % <dict> <key> oget <object>
- % Before release 6.20, this procedure stored the resolved
- % object back into the referring slot. In order to support
- % PDF linearization, we no longer do this.
- get oforce
-} bind def
-/oforce_array { % <array> oforce_array <array>
- [ exch { oforce } forall ]
-} bind def
-/oforce_elems { % <array> oforce_elems <first> ... <last>
- { oforce } forall
-} bind def
-/oforce_recursive { % <any> oforce_recursive <any>
- oforce dup type dup /arraytype eq {
- pop [ exch { oforce_recursive } forall ]
- } {
- /dicttype eq {
- << exch { oforce_recursive exch oforce exch } forall >>
- } if
- } ifelse
-} bind def
-
-% A null value in a dictionary is equivalent to an omitted key;
-% we must check for this specially.
-/knownoget { % <dict> <key> knownoget <value> true
- % <dict> <key> knownoget false
- % See oget above regarding this procedure.
- .knownget {
- oforce dup //null eq { pop //false } { //true } ifelse
- } {
- //false
- } ifelse
-} bind def
-
-% PDF 1.1 defines a 'foreign file reference', but not its meaning.
-% Per the specification, we convert these to nulls.
-/F { % <file#> <object#> <generation#> F <object>
- % Some PDF 1.1 files use F as a synonym for f!
- .pdfcount 3 lt { f } { pop pop pop null } ifelse
-} bind def
-
-% Verify the generation number for a specified object
-% Note: The values in Generations is the generation number plus 1.
-% If the value in Generations is zero then the object is free.
-/checkgeneration { % <object#> <generation#> checkgeneration <object#> <OK>
- Generations 2 index lget 1 sub 1 index eq { % If generation # match ...
- pop true % Then return true
- } { % Else not a match ...
- QUIET not { % Create warning message if not QUIET
- Generations 2 index lget 0 eq { % Check if object is free ...
- ( **** Warning: reference to free object: )
- 2 index =string cvs concatstrings ( ) concatstrings % put obj #
- exch =string cvs concatstrings ( R\n) concatstrings % put gen #
- } {
- ( **** Warning: wrong generation: )
- 2 index =string cvs concatstrings ( ) concatstrings % put obj #
- exch =string cvs concatstrings % put gen #
- (, xref gen#: ) concatstrings 1 index Generations % put xref gen #
- exch lget 1 sub =string cvs concatstrings (\n) concatstrings
- } ifelse
- pdfformaterror % Output warning message
- } { % Else QUIET ...
- pop % Pop generation number
- } ifelse
- % We should return false for an incorrect generation number, however
- % we are simply printing a warning and then returning true. This makes
- % Ghostscript tolerant of of bad generation numbers.
- true
- } ifelse
-} bind def
-/R { % <object#> <generation#> R <object>
- /resolveR cvx 3 packedarray cvx
-} bind def
-
-% If we encounter an object definition while reading sequentially,
-% we just store it away and keep going.
-/objopdict mark
- valueopdict { } forall
- /endobj dup cvx
-.dicttomark readonly def
-
-/obj { % <object#> <generation#> obj <object>
- PDFfile objopdict .pdfrun
-} bind def
-
-/endobj { % <object#> <generation#> <object> endobj <object>
- 3 1 roll
- % Read the xref entry if we haven't yet done so.
- % This is only needed for generation # checking.
- 1 index resolved? {
- pop
- } if
- checkgeneration {
- % The only global objects we bother to save are
- % (resource) dictionaries.
- 1 index dup gcheck exch type /dicttype eq and {
- PDFDEBUG { (%Local=>global: ) print dup == } if
- GlobalObjects 1 index 3 index put
- IsGlobal 1 index 1 put
- } if
- Objects exch 2 index lput
- } {
- pop pop null
- } ifelse
-} bind def
-
-% When resolving an object reference in an object stream, we stop at
-% the end of file. Note: Objects in an object stream do not have either
-% a starting 'obj' or and ending 'endobj'.
-/resolveobjstreamopdict mark
- valueopdict { } forall
- (%%EOF) cvn { exit } bind
-.dicttomark readonly def
-
-% Note: This version of this function is not currently being used.
-% Resolve all objects in an object stream
-/resolveobjectstream { % <object stream #> resolveobjectstream -
- PDFDEBUG { (%Resolving object stream: ) print } if
- 0 resolveR % Get the objectstream dict, all objstrms use 0 as the gen #
- dup /First get % Save location of first object onto the stack
- 1 index /N get % Save number of objects onto the stack
- 2 index false resolvestream % Convert stream dict into a stream
- /ReusableStreamDecode filter % We need to be able to position stream
- % Objectstreams begin with list of object numbers and locations
- % Create two arrays to hold object numbers and stream location
- 1 index array % Array for holding object number
- 2 index array % Array for holding stream object location
- % Get the object numbers and locations.
- 0 1 5 index 1 sub { % Loop and collect obj # and locations
- % Stack: objstreamdict First N objectstream [obj#] [loc] index
- 2 index 1 index % Setup to put obj# into object number array
- 5 index token pop put % Get stream, then get obj# and put into array
- 1 index 1 index % Setup to put object loc into location array
- 5 index token pop put % Get stream, get obj loc and put into array
- pop % Remove loop index
- } for
- % Create a bytestring big enough for reading any object data
- % Scan for the size of the largest object
- 0 0 % Init max object size and previous location
- 2 index { % Loop through all object locations
- % Stack: ... maxsize prevloc currentloc
- dup 4 1 roll % Save copy of object location into stack
- exch sub % Object size = currentloc - prevloc
- .max % Determine maximum object size
- exch % Put max size under previous location
- } forall
- pop % Remove previous location
- .bigstring % Create bytestring based upon max obj size
- % Move to the start of the object data
- 3 index 6 index % Get objectstream and start of first object
- setfileposition % Move to the start of the data
- % Read the data for all objects except the last. We do
- % not know the size of the last object so we need to treat
- % it as a special case.
- 0 1 6 index 2 sub {
- dup 4 index exch get % Get our current object number
- % Stack: objstreamdict First N objectstream [obj#] [loc]
- % bytestring loopindex object#
- dup resolved? { % If we already have this object
- (yyy) = pstack (yyy) = flush xxx
- pop pop % Remove object and object number
- 1 add 2 index exch get % Get location of next object
- 6 index add 6 index exch % Form location of next object and get stream
- setfileposition % Move to the start of the next object data
- } { % Else this is a new object ...
- % We are going to create a string for reading the object
- 2 index 0 % use our working string
- % Determine the size of the object
- 5 index 4 index 1 add get % Get location of the next object
- 6 index 5 index get % Get location of this object
- sub % Size of object = next loc - this loc
- getinterval % Create string for reading object
- 6 index exch readstring pop % Read object
- /ReusableStreamDecode filter % Convert string into a stream
- resolveobjstreamopdict .pdfrun % Get PDF object
- Objects exch 2 index exch lput % Put object into Objects array
- pop pop % Remove object # and loop index
- } ifelse
- } for
- pop pop % Remove our working string and loc array
- % Now read the last object in the object stream. Since it
- % is the last object, we can use the original stream and
- % terminate when we hit the end of the stream
- % Stack: objstreamdict First N objectstream [obj#]
- 2 index 1 sub get % Get our current object number
- dup resolved? not { % If we do not already have this object
- exch % Get our object stream
- resolveobjstreamopdict .pdfrun % Get PDF object
- Objects exch 2 index exch lput % Put object into Objects array
- } if
- pop pop pop pop % Clear stack
-} bind def
-
-% Resolve all objects in an object stream
-/resolveobjectstream { % <object stream #> resolveobjectstream -
- PDFDEBUG { (%Resolving object stream: ) print } if
- 0 resolveR % Get the objectstream dict, all objstrms use 0 as the gen #
- dup /Type get /ObjStm ne { % Verify type is object stream
- ( **** Incorrect Type in object stream dictionary.\n) pdfformaterror
- /resolveobjectstream cvx /typecheck signalerror
- } if
- dup /N get % Save number of objects onto the stack
- 1 index false resolvestream % Convert stream dict into a stream
- /ReusableStreamDecode filter % We need to be able to position stream
- % Objectstreams begin with list of object numbers and locations
- 1 index array % Create array for holding object number
- % Get the object numbers
- 0 1 4 index 1 sub { % Loop and collect obj numbers
- % Stack: objstreamdict N PDFDEBUG objectstream [obj#] loopindex
- 1 index 1 index % Setup to put obj# into object number array
- 4 index token pop put % Get stream, then get obj# and put into array
- 2 index token pop pop pop % Get stream, get obj loc and clear stack
- } for
- % Move to the start of the object data
- 1 index 4 index /First get % Get objectstream and start of first object
- setfileposition % Move to the start of the data
- % We disable PDFDEBUG while reading the data stream. We will
- % print the data later
- PDFDEBUG /PDFDEBUG false def % Save PDFDEBUG and disable it while reading
- % Read the data for all objects. We check to see if we get
- % the number of objects that we expect.
- % Stack: objstreamdict N objectstream [obj#] PDFDEBUG
- mark 4 -1 roll % Get objectstream
- count 5 index add % Determine stack depth with objects
- /PDFObjectStkCount exch def
- resolveobjstreamopdict .pdfrun % Get PDF objects
- PDFObjectStkCount count ne { % Check stack depth
- ( **** Incorrect object count in object stream.\n) pdfformaterror
- /resolveobjectstream cvx /rangecheck signalerror
- } if
- % We have the object data
- counttomark array astore % Put objects into an array
- exch pop % Remove mark
- exch /PDFDEBUG exch def % Restore PDFDEBUG flag
- % Save the objects into Objects
- 0 1 2 index length 1 sub { % Loop through all objects
- % Stack: objstreamdict N [obj#] [objects] loopindex
- dup 3 index exch get % Get our current object number
- dup resolved? { % If we already have this object
- pop pop % Remove object and object number
- } { % Else if we do not have this object
- PDFDEBUG { (%Resolving compressed object: [) print dup =only ( 0]) = } if
- Objects exch 3 index % Put the object into Objects
- 3 index get
- PDFDEBUG { dup === flush } if
- lput
- } ifelse
- pop % Remove loop index
- } for
- pop pop pop pop % Remove objstream, N, (obj#], and [objects]
-} bind def
-
-% When resolving an object reference, we stop at the endobj or endstream.
-/resolveopdict mark
- valueopdict { } forall
- /endstream { endobj exit } bind
- /endobj { endobj exit } bind
- % OmniForm generates PDF file with endobj missing in some
- % objects. AR ignores this. So we have to do it too.
- /obj { pop pop endobj exit } bind
-.dicttomark readonly def
-
-/resolveR { % <object#> <generation#> resolveR <object>
- PDFDEBUG {
- PDFSTEPcount 1 le {
- (%Resolving: ) print 2 copy 2 array astore ==
- } if
- } if
- 1 index resolved? { % If object has already been resolved ...
- exch pop exch pop % then clear stack and return object
- } { % Else if not resolved ...
- PDFfile fileposition 3 1 roll % Save current file position
- 1 index Objects exch lget % Get location of object from xref
- 3 1 roll checkgeneration { % Verify the generation number
- % Stack: savepos objpos obj#
- ObjectStream 1 index lget dup 0 eq { % Check if obj in not an objstream
- pop exch PDFoffset add PDFfile exch setfileposition
- PDFfile token pop 2 copy ne
- { ( **** Unrecoverable error in xref!\n) pdfformaterror
- /resolveR cvx /rangecheck signalerror
- }
- if pop PDFfile token pop
- PDFfile token pop /obj ne
- { ( **** Unrecoverable error in xref!\n) pdfformaterror
- /resolveR cvx /rangecheck signalerror
- }
- if
- pdf_run_resolve % PDFfile resolveopdict .pdfrun
- } { % Else the object is in an ObjectStream
- % Process an objectstream object. We are going to resolve all
- % of the objects in sthe stream and place them into the Objects
- % array.
- % Stack: savepos objpos obj# objectstream#
- resolveobjectstream
- resolved? { % If object has already been resolved ...
- exch pop % Remove object pos from stack.
- } {
- pop pop null % Pop objpos and obj#, put null for object
- } ifelse
- } ifelse
- } { % Else the generation number is wrong
- % Don't cache if the generation # is wrong.
- pop pop null % Pop objpos and obj#, put null for object
- } ifelse % ifelse generation number is correct
- exch PDFfile exch setfileposition % Return to original file position
- } ifelse
-} bind def
-
-% ================================ Streams ================================ %
-
-% We represent a stream by an executable dictionary that contains,
-% in addition to the contents of the original stream dictionary:
-% /File - the file or string where the stream contents are stored,
-% if the stream is not an external one.
-% /FilePosition - iff File is a file, the position in the file
-% where the contents start.
-% /StreamKey - the key used to decrypt this stream, if any.
-% We do the real work of constructing the data stream only when the
-% contents are needed.
-
-% Construct a stream. The length is not reliable in the face of
-% different end-of-line conventions, but it's all we've got.
-%
-% PDF files are inconsistent about what may fall between the 'stream' keyword
-% and the actual stream data, and it appears that no one algorithm can
-% detect this reliably. We used to try to guess whether the file included
-% extraneous \r and/or \n characters, but we no longer attempt to do so,
-% especially since the PDF 1.2 specification states flatly that the only
-% legal terminators following the 'stream' keyword are \n or \r\n, both of
-% which are properly skipped and discarded by the token operator.
-% Unfortunately, this doesn't account for other whitespace characters that
-% may have preceded the EOL, such as spaces or tabs. Thus we back up one
-% character and scan until we find the \n terminator.
-/stream { % <dict> stream <modified_dict>
- dup /Length oget 0 eq {
- dup /Filter undef % don't confuse any filters that require data
- } if
- dup /F known dup PDFsource PDFfile eq or {
- not {
- dup /File PDFfile put
- % make sure that we are just past the EOL \n character
- PDFfile dup fileposition 1 sub setfileposition % back up one
-
- PDFfile read pop
- dup 13 eq {
- % If there had been a \n, token would have advanced over it
- % thus, if the terminator was \r, we have a format error!
- ( **** Warning: stream operator not terminated by valid EOL.\n) pdfformaterror
- pop % fileposition is OK (just past the \r).
- } {
- % Otherwise, scan past \n
- { 10 eq { exit } if
- PDFfile read pop
- } loop
- } ifelse
- dup /FilePosition PDFfile fileposition put
- PDFDEBUG {
- PDFSTEPcount 1 le {
- (%FilePosition: ) print dup /FilePosition get ==
- } if
- } if
- } if
- % Some (bad) PDf files have invalid stream lengths. This causes problems
- % if we reposition beyond the end of the file. So we compare the given
- % length to number of bytes left in the file.
- dup /Length oget
- dup PDFfile bytesavailable lt { % compare to to bytes left in file
- PDFfile fileposition % reposition to the end of stream
- add PDFfile exch setfileposition
- } {
- pop % bad stream length - do not reposition.
- % This will force a length warning below
- } ifelse
- } {
- pop
- % We're already reading from a stream, which we can't reposition.
- % Capture the sub-stream contents in a string.
- dup /Length oget string PDFsource exch readstring
- not {
- ( **** Warning: Unexpected EOF in stream!\n) pdfformaterror
- /stream cvx /rangecheck signalerror
- } if
- 1 index exch /File exch put
- } ifelse
- PDFsource token_nofail not { null } if
- dup /endobj eq {
- % Another case that Acrobat Reader handles -- 'endobj' without 'endstream'.
- ( **** Warning: stream missing 'endstream'.\n) pdfformaterror
- pop /endstream % fake a valid endstream
- } if
- /endstream ne {
- ( **** Warning: stream Length incorrect.\n) pdfformaterror
- dup /Length undef % prevent the use of the incorrect length.
- cvx endobj exit % exit from .pdfrun now.
- } if
- cvx
-} bind def
-/endstream {
- exit
-} bind def
-
-% Contrary to the published PDF (1.3) specification, Acrobat Reader
-% accepts abbreviated filter names everywhere, not just for in-line images,
-% and some applications (notably htmldoc) rely on this.
-/unabbrevfilterdict mark
- /AHx /ASCIIHexDecode /A85 /ASCII85Decode /CCF /CCITTFaxDecode
- /DCT /DCTDecode /Fl /FlateDecode /LZW /LZWDecode /RL /RunLengthDecode
-.dicttomark readonly def
-
-% Extract and apply filters.
-/filterparms { % <dict> <DPkey> <Fkey> filterparms
- % <dict> <parms> <filternames>
- 2 index exch knownoget {
- oforce_recursive
- exch 2 index exch knownoget {
- % Both filters and parameters.
- oforce_recursive
- exch dup type /nametype eq {
- 1 array astore exch
- dup type /arraytype ne { 1 array astore } if exch
- } if
- } {
- % Filters, but no parameters.
- //null exch
- dup type /nametype eq { 1 array astore } if
- } ifelse
- } {
- % No filters: ignore parameters, if any.
- pop //null { }
- } ifelse
-} bind def
-/filtername { % <filtername> filtername <filtername'>
- //unabbrevfilterdict 1 index .knownget { exch pop } if
- dup /Filter resourcestatus { pop pop } {
- Repaired exch % this error is not the creator's fault
- ( **** ERROR: Unable to process ) pdfformaterror
- 64 string cvs pdfformaterror
- ( data. Page will be missing data.\n) pdfformaterror
- /Repaired exch store % restore the previous "Repaired" state
- % provide a filter that returns EOF (no data)
- /.EOFDecode
- } ifelse
-} bind def
-/applyfilters { % <parms> <source> <filternames> applyfilters <stream>
- 2 index null eq {
- { filtername filter }
- } {
- { % Stack: parms source filtername
- 2 index 0 oget dup null eq { pop } {
- exch filtername dup /JBIG2Decode eq { exch jbig2cachectx exch } if
- } ifelse filter
- exch dup length 1 sub 1 exch getinterval exch
- }
- } ifelse forall exch pop
-} bind def
-
-% JBIG2 streams have an optional 'globals' stream obj for
-% sharing redundant data between page images. Here we resolve
-% that stream reference (if any) and run it through the decoder,
-% creating a special -jbig2globalctx- postscript object our
-% JBIG2Decode filter implementation looks for in the parm dict.
-/jbig2cachectx { % <parmdict> jbig2cachectx <parmdict>
- dup /JBIG2Globals knownoget {
- % make global ctx
- PDFfile fileposition exch % resolvestream is not reentrant
- true resolvestream % stack after: PDFfileposition -file-
- % Read the data in a loop until EOF to so we can move the strings into a bytestring
- [ { counttomark 1 add index 60000 string readstring not { exit } if } loop ]
- exch pop 0 1 index { length add } forall % compute the total length
- % now copy the data from the array of strings into a bytestring
- .bytestring exch 0 exch { 3 copy putinterval length add } forall pop
- .jbig2makeglobalctx
- PDFfile 3 -1 roll setfileposition
- 1 index exch
- /.jbig2globalctx exch put
- } if
-} bind def
-
-% When used with a PDF image dict, the JPXDecode filter needs to know
-% about any ColorSpace entries, since this overrides whatever is in
-% the image stream itself. We therefore propagate any such key into
-% a filter's DecodeParms.
-/jpxparmfix { % <streamdict> <readdata?> jpxparmfix <streamdict <readdata?>
- 1 index /Filter .knownget
- { /JPXDecode eq % we only need to do this for JPXDecode filters
- % TODO: handle filter arrays
- {
- 1 index /ColorSpace knownoget {
- 2 index /DecodeParms knownoget {
- % insert in the existing DecodeParms dict
- /ColorSpace 3 -1 roll put
- }{
- 1 dict % need to create a custom DecodeParms dict
- dup /ColorSpace 4 -1 roll put
- 2 index exch /DecodeParms exch put
- } ifelse
- } if
- } if
- } if
-} bind def
-
-% Resolve a stream dictionary to a PostScript stream.
-% Streams with no filters require special handling:
-% - Whether we are going to interpret the stream, or If we are just
-% going to read data from them, we impose a SubFileDecode filter
-% that reads just the requisite amount of data.
-% Note that, in general, resolving a stream repositions PDFfile.
-% Clients must save and restore the position of PDFfile themselves.
-/resolvestream { % <streamdict> <readdata?> resolvestream <stream>
- jpxparmfix
- 1 index /F knownoget {
- % This stream is stored on an external file.
- (r) file 3 -1 roll
- /FDecodeParms /FFilter filterparms
- % Stack: readdata? file dict parms filternames
- 4 -1 roll exch
- pdf_decrypt_stream
- applyfilters
- } {
- exch
- dup /Length knownoget { 0 eq } { //false } ifelse {
- () 0 () /SubFileDecode filter
- } {
- dup /FilePosition .knownget {
- 1 index /File get exch setfileposition
- } if
- % Stack: readdata? dict
- /DecodeParms /Filter filterparms
- % Stack: readdata? dict parms filternames
- 2 index /File get exch
- % Stack: readdata? dict parms file/string filternames
- dup length 0 eq {
- % All the PDF filters have EOD markers, but in this case
- % there is no specified filter.
- exch dup type /filetype eq 5 index or {
- % Use length for any files or reading data from any source.
- 3 index /Length knownoget not { 0 } if
- } {
- 0 % Otherwise length of 0 for whole string
- } ifelse
- 4 index /IDFlag known { pop } { () /SubFileDecode filter } ifelse
- exch
- pdf_decrypt_stream % add decryption if needed
- pop exch pop
- } {
- % Stack: readdata? dict parms source filternames
- exch 3 index /Length knownoget {
- () /SubFileDecode filter
- } if exch
- pdf_decrypt_stream % add decryption if needed
- applyfilters
- } ifelse
- } ifelse
- } ifelse
- % Stack: readdata? dict file
- exch pop exch pop
-} bind def
-
-% ============================ Name/number trees ============================ %
-
-/nameoget { % <nametree> <key> nameoget <obj|null>
- exch /Names exch .treeget
-} bind def
-
-/numoget { % <numtree> <key> numoget <obj|null>
- exch /Nums exch .treeget
-} bind def
-
-/.treeget { % <key> <leafkey> <tree> .treeget <obj|null>
- dup /Kids knownoget {
- exch pop .branchget
- } {
- exch get .leafget
- } ifelse
-} bind def
-
-/.branchget { % <key> <leafkey> <kids> .branchget <obj|null>
- dup length 0 eq {
- pop pop pop null
- } {
- dup length -1 bitshift 2 copy oget
- % Stack: key leafkey kids mid kids[mid]
- dup /Limits oget aload pop
- % Stack: key leafkey kids mid kids[mid] min max
- 6 index lt {
- pop pop
- 1 add 1 index length 1 index sub getinterval .branchget
- } {
- 5 index gt {
- pop
- 0 exch getinterval .branchget
- } {
- exch pop exch pop .treeget
- } ifelse
- } ifelse
- } ifelse
-} bind def
-
-/.leafget { % <key> <pairs> .leafget <obj|null>
- dup length 2 eq {
- dup 0 get 2 index eq { 1 oget } { pop null } ifelse
- exch pop
- } {
- dup length -1 bitshift -2 and 2 copy oget
- % Stack: key pairs mid pairs[mid]
- 3 index gt { 0 exch } { 1 index length 1 index sub } ifelse
- getinterval .leafget
- } ifelse
-} bind def
-
-end % pdfdict
-.setglobal
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