% Copyright (C) 1994, 2000 Aladdin Enterprises. 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_main.ps 9826 2009-06-30 00:06:33Z alexcher $
% pdf_main.ps
% PDF file- and page-level operations.
/.setlanguagelevel where { pop 2 .setlanguagelevel } if
.currentglobal true .setglobal
/pdfdict where { pop } { /pdfdict 100 dict def } ifelse
pdfdict begin
% Patch in an obsolete variable used by some third-party software.
/#? false def
% Test whether the current output device handles pdfmark.
/.writepdfmarkdict 1 dict dup /pdfmark null put readonly def
/.writepdfmarks { % - .writepdfmarks <bool>
currentdevice //.writepdfmarkdict .getdeviceparams
mark eq { false } { pop pop true } ifelse
systemdict /DOPDFMARKS known or
} bind def
% For simplicity, we use a single interpretation dictionary for all
% PDF graphics execution, even though this is too liberal.
/pdfopdict mark
objopdict { } forall
drawopdict { } forall
/endstream { exit } bind
(%%EOF) cvn { exit } bind % for filters
/obj { ( **** Warning: Content stream is not terminated by 'endstream'.\n)
pdfformaterror pop pop exit
} bind
% PDF 1.1 operators
/BX { /BXlevel BXlevel 1 add store } bind
/EX { /BXlevel BXlevel 1 sub store } bind
/PS { cvx exec } bind
% PDF 1.2 operators
/BMC { pop } bind
/BDC { pop pop } bind
/EMC { }
/MP { pop } bind
/DP { pop pop } bind
/- { 0 % Bug 690016
( **** Warning: Invalid operator '-' is assumed to be a number 0.\n)
pdfformaterror
} bind
.dicttomark readonly def
% ======================== Main program ======================== %
end % pdfdict
userdict begin
/defaultfontname /Times-Roman def
% Make sure the registered encodings are loaded, so we don't run the risk
% that some of the indices for their names will overflow the packed
% representation. (Yes, this is a hack.)
SymbolEncoding pop
DingbatsEncoding pop
% Redefine 'run' so it recognizes PDF files.
systemdict begin
/.runps /run load def
/run {
dup type /filetype ne { (r) file } if
% skip leading whitespace characters (actually anything less than or equal to <sp>)
{ dup ( ) .peekstring not { false exit } if
dup 0 get 32 le { pop dup read pop pop } { true exit } ifelse
} loop
exch pop
{
% Appletalk PAP sends short strings with %! header expecting a response.
% 'gv' swallows the %!PS line, then sends DSC comments beginning with %%
% and also waits for a response. The following avoids those hangs.
dup 2 string .peekstring pop dup (%!) eq exch (%%) eq or {
cvx .runps
} {
dup 1023 string .peekstring pop dup length 400 ge {
% "1024 string" exceeds current %stdin buffer
% Valid PDF file cannot be smaller than 400 bytes.
(%PDF-) search {
3 1 roll pop pop
dup (%!PS) search not {
length 0 ne {
1 index exch readstring pop pop
(%stderr) (w) file dup
( **** Warning: File has some garbage before %PDF- .\n)
writestring flushfile
} {
pop
} ifelse
dup (%stdin) (r) file eq {
% Copy PDF from stdin to temporary file then run it.
null (w+) /.tempfile .systemvar exec exch 3 1 roll
% stack: tempname stdin tempfile
64000 string
{
% stack: tempname stdin tempfile string
2 index 1 index readstring
exch 3 index exch writestring
not { exit } if
}
loop
pop exch closefile
% stack: tempname tempfile
dup 0 setfileposition
dup runpdf
closefile deletefile
} {
runpdf
} ifelse
} {
pop pop pop pop cvx .runps % (%!PS) found first
} ifelse
} {
pop cvx .runps % (%PDF-) not found
} ifelse
} {
pop cvx .runps % too short for PDF
} ifelse
} ifelse
} {
closefile % file was empty
} ifelse
} bind odef
currentdict /runpdfstring .undef
/runpdfbegin { % <file> runpdfbegin -
userdict begin
% It turns out that the PDF interpreter uses memory more
% effectively if it is run under at least one level of save.
% This is counter-intuitive, and we don't understand why it happens,
% but the improvement is significant.
/PDFTopSave save def
0 setobjectformat
/Page# null def
/Page null def
/DSCPageCount 0 def
/PDFSave null def
GS_PDF_ProcSet begin
pdfdict begin
pdfopen begin
} bind def
/runpdfpagerange { % - runpdfpagerange <firstpage#> <lastpage#>
/FirstPage where
{ pop FirstPage dup pdfpagecount gt
{ (\nRequested FirstPage is greater than the number of pages in the file: ) print
pdfpagecount = flush
} if
} {
1
} ifelse
/LastPage where { pop LastPage pdfpagecount .min } { pdfpagecount } ifelse
1 index 1 index gt
{ ( No pages will be processed \(FirstPage > LastPage\).) = flush }
{ QUIET not
{ (Processing pages ) print 1 index =only ( through ) print dup =only
(.) = flush
}
if
}
ifelse
} bind def
/dopdfpages { % firstpage# lastpage# dopdfpages -
<< /PDFScanRules //true >> setuserparams % set scanning rules for PDF vs. PS
<< /RenderTTNotdef systemdict
/RENDERTTNOTDEF get >> setuserparams % Should we render TT /.notdef
1 exch
{ dup /Page# exch store
QUIET not { (Page ) print dup == flush } if
pdfgetpage pdfshowpage
} for
<< /PDFScanRules //null >> setuserparams % restore scanning rules for PS
} bind def
/runpdfend {
Repaired { printrepaired } if
currentdict pdfclose
end % temporary dict
end % pdfdict
end % GS_PDF_ProcSet
PDFTopSave restore
end % userdict
2 vmreclaim % couldn't hurt
} bind def
% Copy stream to an external temporary file and
% return the file name as PS name.
/copy_embedded_file {
//true resolvestream % strm
//null (w) /.tempfile % strm (name) null (w) /.tempfile
.systemvar exec % strm (name) file
3 -1 roll % (name) file strm
32768 string % (name) file strm (buf)
{ 3 copy readstring % (name) file strm (buf) file (data) bool
3 1 roll % (name) file strm (buf) bool file (data)
writestring % (name) file strm (buf) bool
not { exit } if
} loop
pop closefile % (name) file
closefile % (name)
cvn % /name
} bind def
% Copy selected subfiles to temporary files and return the file names
% as a PostScript names to protect them from restore.
% Currently, all files in the Portfolio are extracted and returned.
%
% - pdf_collection_files [ /temp_file_name ... /temp_file_name
/pdf_collection_files {
mark
Trailer /Root oget
dup /Collection oknown {
/Names knownoget {
/EmbeddedFiles knownoget {
/Names knownoget {
{ oforce
dup type /dicttype eq {
/EF knownoget {
/F knownoget {
copy_embedded_file
} if
} if
} {
pop
} ifelse
} forall
} if
} if
} if
} {
pop
} ifelse
} bind def
/runpdf { % <file> runpdf -
//runpdfbegin exec
//pdf_collection_files exec
dup mark eq {
pop
copy_trailer_attrs
//runpdfpagerange exec
//dopdfpages exec
//runpdfend exec
} {
//runpdfend exec
] {
dup type /filetype eq {
//runpdfbegin exec
copy_trailer_attrs
//runpdfpagerange exec
//dopdfpages exec
//runpdfend exec
closefile
} {
.namestring dup (r) file
//runpdfbegin exec
copy_trailer_attrs
//runpdfpagerange exec
//dopdfpages exec
//runpdfend exec
deletefile
} ifelse
} forall
} ifelse
} bind def
currentdict /pdf_collection_files .undef
end % systemdict
% Redefine the procedure that the C code uses for running piped input.
% It is OK to use { (%stdin) run } here, because a startjob cannot occur.
/.runstdin {
{ (%stdin) run } execute0
} bind def
end % userdict
pdfdict begin
% ======================== File parsing ======================== %
% Read the cross-reference and trailer sections.
/traileropdict mark
(<<) cvn { /dictlevelcount dictlevelcount 1 add store mark } bind
(>>) cvn { { .dicttomark } stopped {
( **** File has unbalanced >> in trailer.\n) pdfformaterror
} if
/dictlevelcount dictlevelcount 1 sub def
dictlevelcount 0 eq { exit } if
} bind
([) cvn { mark } bind % ditto
(]) cvn dup load
% /true true % see .pdfexectoken in pdf_base.ps
% /false false % ibid.
% /null null % ibid.
/R { /resolveR cvx 3 packedarray cvx } bind % see Objects below
.dicttomark readonly def
% Because of EOL conversion, lines with fixed contents might be followed
% by one or more blanks.
/lineeq % <filestr> <conststr> lineeq <bool>
{ anchorsearch
{ pop { ( ) anchorsearch not { () eq exit } if pop } loop }
{ pop false }
ifelse
} bind def
/linene { lineeq not } bind def
% Read original version (pre PDF 1.5) of the xref table.
% Note: The position is the location of 'xref'. The current PDFfile
% position is just after the 'XREF'.
/readorigxref % <pos> readorigxref <trailerdict>
{
pop % We do not need the position.
0 % Initialize xref table error counter
{ PDFfile token pop % first object # or trailer
dup /trailer eq { pop exit } if
PDFfile pdfstring readline pop
token pop % entry count
% remaining must be whitespace only (otherwise this xref Size was invalid.
exch dup length 0 ne {
false 1 index { 32 gt { pop true exit } if } forall {
( **** Warning: xref subsection header has extra characters.\n)
pdfformaterror
/setxrefentry cvx /syntaxerror signalerror
} if
} if
pop % remove last
% This section might be adding new objects:
% ensure that Objects and Generations are big enough.
% stack: <err count> <first obj> <entry count>
2 copy add growPDFobjects
{ % stack: <err count> <obj num>
% Read xref line
PDFfile 20 string readstring pop % always read 20 chars.
token pop % object position
exch token pop % generation #
exch token pop % n or f
exch % stack: <err count> <obj#> <loc> <gen#> <tag> <remainder of line>
dup length 0 ne {
% check to make sure trailing garbage is just white space
dup { 32 gt { 5 -1 roll 1 add 5 1 roll } if } forall % bump error count on garbage
} if
pop % Stack: <err count> <obj#> <loc> <gen#> <tag>
dup /n eq { % xref line tag is /n
pop % pop dup of line tag
0 3 1 roll % Set ObjectStream object number = 0
//false setxrefentry % Save xref entry, don't change existing entries
3 -1 roll pop % Remove ObjectStream object onumber
}
{ % xref line tag was not /n
/f ne % verify that the tag was /f
{ /setxrefentry cvx /syntaxerror signalerror
} if
} ifelse
pop pop % pop <obj location> and <gen num>
% stack: <err count> <obj num>
1 add % increment object number
} repeat
pop % pop <obj #>
} loop
0 ne {
( **** Warning: length of some xref entries is not equal to 20 bytes.\n)
pdfformaterror
} if
/dictlevelcount 0 def
PDFfile traileropdict .pdfrun
} bind def
% This dicitonary is used to read the xref dictionary. It should work for
% reading any dictionary. dictlevelcount must contain 0.
/xrefopdict mark
(<<) cvn { /dictlevelcount dictlevelcount 1 add def mark } bind
(>>) cvn { .dicttomark /dictlevelcount dictlevelcount 1 sub def
dictlevelcount 0 eq { exit} if } bind
([) cvn { mark } bind % ditto
(]) cvn dup load
% /true true % see .pdfexectoken in pdf_base.ps
% /false false % ibid.
% /null null % ibid.
/R { /resolveR cvx 3 packedarray cvx } bind % see Objects below
.dicttomark readonly def
% Get a variable length positive integer value from a stream. A value
% of zero is returned if the count is zero.
/getintn { % <stream> <count> getintn int
0 exch { 256 mul 1 index read pop add } repeat
exch pop % Discard stream
} bind def
% This array contains handlers for processing the different types of
% entries in the XRef stream.
% Stack: <Xrefdict> <xref stream> <Index array> <pair loc> <obj num>
% <field 2> <field 3>
% The handlers leave the stack unchanged.
/xref15entryhandlers [
{ % XRef entry type 0 - free or f type xref entry
% (free ) print
% (obj num: ) print 2 index pdfstring cvs print ( ) print
% (loc: ) print 1 index pdfstring cvs print ( ) print
% (gen: ) print dup === flush
} bind % Do nothing for free xref entries
% XRef entry type 1 - normal or n type xref entry
{ % field 2 = obj loc, field 3 = gen num
% (normal ) print
% (obj num: ) print 2 index pdfstring cvs print ( ) print
% (loc: ) print 1 index pdfstring cvs print ( ) print
% (gen: ) print dup === flush
0 3 1 roll % set stream number = 0
//false setxrefentry
3 -1 roll pop % remove stream number
} bind
% XRef entry type 2 - compressed object type xref entry
{ % field 2 = object stream num, field 3 = index into object stream
% (Compressed objects: ) print
% (obj num: ) print 2 index pdfstring cvs print ( ) print
% (field 2: ) print 1 index pdfstring cvs print ( ) print
% (field 3: ) print dup === flush
0 //false setxrefentry pop % set generation number = 0
} bind
] def
% Read the PDF 1.5 version of the xref table.
% Note: The position is the location of the start of the dictionary object
% In PDF 1.5, the XRef dictionary also serves as the trailer dictionary
/readpdf15xref % <pos> readpdf15xref <trailerdict>
{
PDFfile exch setfileposition % move to start of object
% Get object number, revision, and 'obj' and discard
PDFfile token pop pop
PDFfile token pop pop
PDFfile token pop pop
% Get the XRef dicitionary
/dictlevelcount 0 def PDFfile xrefopdict .pdfrun
% Verify that we have an XRef dictionary
dup /Type get /XRef ne {
/readpdf15xref cvx /syntaxerror signalerror
} if
% Ensure that we we have room in the objects array, etc.
dup /Size get growPDFobjects
% Create a stream for the XRef data
PDFfile token pop pop % Skip over 'stream'
dup stream false resolvestream
% Stack: <XRefdict> <xref stream>
% The Index array defines the ranges of object numbers in the
% XRef stream. Each value pair is consists of starting object
% number and the count of consecutive objects.
% Get the Index array, if present
1 index /Index .knownget not { % If no Index array ...
[ 0 3 index /Size get ] % Default = [ 0 Size ]
} if
% Loop through the Index array
0 2 2 index length 1 sub {
% Get start and end of object range
2 copy get % Start of the range
dup 3 index 3 index 1 add get % Number of entries in range
% Loop through the range of object numbers
add 1 sub 1 exch { % Form end of range, set increment = 1
% Stack: <Xrefdict> <xref stream> <Index array> <pair loc> <obj num>
% Get xref parameters. Note: The number of bytes for each parameter
% is defined by the entries in the W array.
4 index /W get aload pop % Get W array values
% The first field indicates type of entry. Get first field value.
% If the num. of bytes for field 1 is 0 then default field value is 1
3 -1 roll dup 0 eq { pop 1 } { 6 index exch getintn } ifelse
% Get the handler for the xref entry type. We will execute the
% handler after we get the other two field values.
xref15entryhandlers exch get
3 -1 roll 6 index exch getintn % Get second field
3 -1 roll 6 index exch getintn % Get third field
3 -1 roll exec % Execute Xref entry handler
pop pop pop % Remove field values and obj num
} for % Loop through Xref entries
pop % Remove Index array pair loc
} for % Loop through Index array entries
pop pop % Remove Index array and xref stream
} bind def
% Read the cross-reference table.
% <pos> is the position either from the startxref statement or the /Prev
% entry in the prior trailer dictionary.
/readxref % <pos> readxref <trailerdict>
{
PDFoffset add PDFfile exch
% Check that the given location is within the file.
dup PDFfilelen gt {
( **** Warning: Specified xref location is beyond end of file.\n)
pdfformaterror
/readxref cvx /invalidaccess signalerror
} if
setfileposition
% In some PDF files, this position actually points to
% white space before the xref line. Skip over this here.
{
PDFfile fileposition PDFfile read pop 32 gt { exit } if pop
} loop
dup % Make copy of the file position (before last char was read).
PDFfile exch setfileposition
% The PDF specification says that the 'xref' must be on a line
% by itself. The code here formerly used readline and linene to
% check this. However, Acrobat Reader only requires the line to
% begin with 'xref', and there are enough applications producing
% non-compliant PDF files that we have to do this too.
PDFfile pdfstring 0 4 getinterval readstring pop
(xref) eq
{
readorigxref % 'xref' -> original xref table
% if hybrid-reference PDF, also fetch the entries
% found in the XRef stream pointed by /XRefStm
dup /XRefStm knownoget {
readpdf15xref pop
} if
}
{ readpdf15xref } % otherwise assume PDF 1.5 xref stream
ifelse
} bind def
% Open a PDF file and read the header, trailer, and cross-reference.
/pdfopen { % <file> pdfopen <dict>
% Color space substitution in PDF is handled somewhat differently
% than in PostScript. A given device color space will be substituted
% if the corresponding "Default..." entry exists in the Page's
% Resource dictionary (which might be inhereted); there is no
% UseCIEColor to enable/disable color mapping.
%
% This behavior is achieved by always setting UseCIEColor to true
% in the page device dictionary. If the value of this parameter was
% originally false (i.e.: the output device does not perform color
% space substitution by default), the instances DefaultGray,
% DefaultRGB, and DefaultCMYK of the (local) ColorSpace category
% are redefined to be DeviceGray, DeviceRGB, and DeviceCMYK,
% respectively. This is not done if UseCIEColor is true by default,
% as in that case color substitution is presumably desired even
% if the file does not request it.
currentpagedevice /UseCIEColor .knownget dup { pop } if not
{ .currentglobal false .setglobal
/DefaultGray { /DeviceGray } cvlit /ColorSpace defineresource pop
/DefaultRGB { /DeviceRGB } cvlit /ColorSpace defineresource pop
/DefaultCMYK { /DeviceCMYK } cvlit /ColorSpace defineresource pop
.setglobal
}
if
pdfopenfile begin
pdfopencache
currentdict end
} bind def
/copy_trailer_attrs { % - copy_trailer_attrs -
writeoutputintents
.writepdfmarks {
% Copy bookmarks (outline) to the output.
Trailer /Root oget /Outlines knownoget {
/First knownoget {
{ dup writeoutline /Next knownoget not { exit } if } loop
} if
} if
} if % end .writepdfmarks
} bind def
% Verify that each entry in the xref table is pointing at an object with
% the correct object number and generation number.
/verify_xref % - verify_xref -
{ PDFfilelen
1 1 Objects llength 1 sub % stack: filesize 1 1 <number of objects - 1>
{ % Check if the object is free (i.e. not used). The values in
% Generations is the generation number plus 1. If the value in
% Generations is zero then the object is free.
% Stack: <filesize> <obj num>
Generations 1 index lget % Get the genration number
0 ne { % Skip if object number is free
ObjectStream 1 index lget % Check if object is in objectstream
0 eq { % We only check objects not in an objectstream
{ % Use stop context since we may get an error if object is invalid
dup Objects exch lget % Get the object location
PDFoffset add dup 3 index ge % Compare object location to file size
{ pop true } % Rebuild if location not in file
{ PDFfile exch setfileposition % Go to the object location
true % Stack: <filesize> <obj num> <true>
PDFfile token pop % Read object number from file
2 index eq { % Verify object number
PDFfile token pop % Read generation number from file
Generations 3 index % Get specified generaton number
lget 1 sub % Gen numbs are stored with 1 added.
eq { % Verify generation number
PDFfile token pop
/obj eq { % Verify 'obj' text
pop false % We have valid object, do not rebuild
} if
} if
} if
} ifelse
} .internalstopped
{ true } if % If we stop then we need to rebuild
% Stack: <filesize> <obj num> <need rebuild flag>
{
( **** Warning: File has an invalid xref entry: )
pdfformaterror
pdfstring cvs pdfformaterror
(. Rebuilding xref table.\n) pdfformaterror
search_objects
exit
} if % If the entry is invalid
} {
% The object is in an object stream. We currently do not rebuild
% objects in an object stream. So If we find one, then abort the
% verification of the xref table entries.
pop exit % Pop object number and then exit loop
} ifelse % If not in an object stream
} if % If object entry is not free
pop % Remove object number
} for
pop % Remove the size of the file
} bind odef
/pdfopencache { % - pdfopencache -
% Create and initialize some caches.
/PageCount pdfpagecount def
/PageNumbers PageCount 65534 .min dict def
/PageIndex PageCount 65534 .min array def
} bind def
/pdfopenfile { % <file> pdfopenfile <dict>
pdfdict readonly pop % can't do it any earlier than this
15 dict begin
/LocalResources 0 dict def
/DefaultQstate //null def % establish binding
/Printed where { pop } {
% Guess whether the output device is a printer.
/Printed currentpagedevice /OutputFile known def
} ifelse
/PSLevel1 where { pop } { /PSLevel1 false def } ifelse
% NB: PDFfile is used outside of the PDF code to determine that a
% PDF job is being processed; to not change or hide this key.
cvlit /PDFfile exch def
/PDFsource PDFfile def
/Repaired false def
currentglobal true .setglobal globaldict begin
/UndefProcList 0 dict def
end .setglobal
PDFfile dup 0 setfileposition
0 () /SubFileDecode filter % to avoid file closure
pdfstring readstring pop
(%PDF-) search not {/pdfopen cvx /syntaxerror signalerror} if
length /PDFoffset exch def pop
% some badly formed PDF's (Visioneer) have something other than EOL
% after the version number. If we get an error, shorten the string
% and try again.
false exch % error encountered
{ { cvr } stopped
{ exch pop true exch 0 1 index length 1 sub dup 0 eq
{ pop 0 exit } if % exit if string now empty
getinterval % trim character from right end and retry
}
{ exch {
( **** Warning: PDF version number not followed by EOL.\n)
pdfformaterror
}
if exit
}
ifelse
} loop
/PDFversion exch def
% Read the last cross-reference table.
count /pdfemptycount exch def
/Trailer << >> def % Initialize to an emptry dict.
{ initPDFobjects findxref readxref } .internalstopped {
recover_xref_data % Read failed. Attempt to recover xref data.
search_trailer % Search for the primary trailer
} {
/Trailer exch def % Save trailer dict after first xref table
% Read any previous cross-reference tables. When we are done,
% verify that the entries in the xref tables are valid if NoVerifyXref
% is not defined.
Trailer
{ /Prev knownoget not { % If no previous xref table then ...
/NoVerifyXref where { pop } { verify_xref } ifelse exit
} if
{ readxref } .internalstopped {
recover_xref_data % Read failed. Attempt to recover xref data.
exit % Exit loop since recover gets all obj data.
} if % If readxref stopped
% The PDF spec. says that each trailer dict should contain the required
% entries. However we have seen a PDF file that only has a Prev entry in
% the initial trailer dict. Acrobat complains but it accepts these files.
% To work with these files, we are copying any entries which we find in
% a previous trailer dict which are not present in the initial dict.
dup {
Trailer 2 index known {
pop pop % discard if key already present
} {
Trailer 3 1 roll put % add key if not present
} ifelse
} forall
} loop % Loop to previous trailer
} ifelse % Ifelse readxref stopped
% Scan numbers in the range 2147483648..4294967295 in Encrypt dictionary
% as unsigned integers for compatibility with Acrobat Reader. Bug 689010.
<< /PDFScanUnsigned //true >> setuserparams
{ Trailer /Encrypt knownoget {
pop
pdf_process_Encrypt % signal error
} if
} stopped
<< /PDFScanUnsigned //false >> setuserparams
{ stop } if
% Check for recursion in the page tree. Bug 689954, MOAB-06-01-2007
verify_page_tree
currentdict end
} bind def
% Look for [\r\n]%%EO from the current position of the file.
% Return the position of %%EO if found or -1 .
/findeof { % <file> find_eof <file> <position>
-1 exch
{
dup bytesavailable 4 lt { exit } if
dup 0 (%%EO) /SubFileDecode filter flushfile
dup dup fileposition 5 sub setfileposition
dup 5 string readstring not { pop exit } if
dup (\r%%EO) eq exch (\n%%EO) eq or {
dup fileposition 4 sub
3 1 roll exch pop
} if
} loop
exch
} bind def
% Skip backward over the %%EOF at the end of the PDF file, and read
% the preceding startxref line. The PDF specification unambiguously
% requires that the %%EOF appear on a line by itself, and that the
% startxref and the following position value appear on separate lines;
% however, some applications truncate the %%EOF to %%EO, and/or put the
% startxref and the following value on the same line.
% There seems to be no limit on the amount of garbage that can be
% appended to the PDF file. Current record (60K) belongs to
% PDF-Out (v 2.0 - 35). We start the search for %%EO from the last 1024
% bytes and continue from the beginning of the file.
/findxref { % - findxref <xrefpos>
PDFfile dup dup dup 0 setfileposition bytesavailable
dup /PDFfilelen exch def
% Find the last %%EOF string (within 1024 bytes)
1024 sub PDFoffset .max
setfileposition findeof % search the last 1024 bytes
dup 0 le {
pop
dup PDFoffset setfileposition findeof % search from the beginnibg
dup 0 le {
( **** Error: Cannot find a %%EOF marker anywhere in the file.\n)
pdfformaterror
/findxref cvx /syntaxerror signalerror
} if
} if
dup 3 1 roll setfileposition
% Stack: eofpos
% Check for whether this is, in fact, a valid PDF file.
dup PDFfilelen exch sub dup dup 7 gt exch 5 lt or {
pop true
} {
string PDFfile exch readstring pop
dup (%%EOF\n) eq exch dup (%%EOF\r) eq
exch dup (%%EOF\r\n) eq exch (%%EOF) eq or or or not
} ifelse {
( **** Warning: File has a corrupted %%EOF marker, or garbage after %%EOF.\n)
pdfformaterror
} if
PDFfile exch setfileposition
% Now read the startxref and xref start position.
prevline token not { null } if dup type /integertype eq {
exch pop cvi % xref start position
exch PDFfile exch setfileposition
prevline dup (startxref) linene {
% startxref not on a line by itself. We have found PDF from
% www.verypdf.com in which the startxref was on the same line as
% the end of trailer dictionary. Check for this. Note: This
% violates the spec.
dup (startxref) search {
% found startxref - print warning
pop pop pop % clear strings from search
( **** Warning: format of the startxref line in this file is invalid.\n)
pdfformaterror
} { % no startxref - we have a problem.
/findxref cvx /syntaxerror signalerror
} ifelse
} if
pop pop
} { % else, this file has 'startxref #####' format
(startxref) ne { /findxref cvx /syntaxerror signalerror } if
cvi % xref start position
( **** Warning: format of the startxref line in this file is invalid.\n)
pdfformaterror
exch PDFfile exch setfileposition
} ifelse
} bind def
/stderrfile (%stderr) (w) file def
/stderrprint { % <string> stderrprint -
//stderrfile dup 3 -1 roll writestring flushfile
} bind def
/pdfformaterror { % <string> pdfformaterror -
stderrprint
/Repaired true store
} bind def
/knownoget_safe
{ 2 copy knownoget { 3 1 roll pop pop //true } { pop pop //false } ifelse
} odef
/printProducer {
Trailer /Info { knownoget_safe } stopped { pop pop false } if {
/Producer knownoget not { null } if
} {
null
} ifelse
dup null eq {
pop
} {
( **** The file was produced by: \n **** >>>> ) stderrprint
% Handle a Unicode Producer.
(\376\377) anchorsearch {
pop dup length 2 idiv string 0 1 2 index length 1 sub {
% Stack: origstr newstr i
1 index exch 3 index 1 index 2 mul 1 add get put
} for exch pop
} if
stderrprint
( <<<<\n) stderrprint
} ifelse
} bind def
% The UndefProcList collects noisy warnings.
% This gets rid of many multiple warnings from pdf_font.ps
/printCollectedWarnings {
UndefProcList length 0 gt {
(\n **** Embedded font uses undefined procedure\(s\): ) stderrprint
UndefProcList {
exch .namestring stderrprint ( ) stderrprint
=string cvs stderrprint ( times, ) stderrprint
} forall
(\n) stderrprint
} if
} bind def
/printrepaired {
printCollectedWarnings
(\n **** This file had errors that were repaired or ignored.\n)
stderrprint
printProducer
( **** Please notify the author of the software that produced this\n)
stderrprint
( **** file that it does not conform to Adobe's published PDF\n)
stderrprint
( **** specification.\n\n)
stderrprint
} bind def
% Write the outline structure for a file. Uses linkdest (below).
% omit links to pages that don't exist.
/writeoutline % <outlinedict> writeoutline -
{ mark
0 2 index /First knownoget
{ { exch 1 add exch /Next knownoget not { exit } if } loop }
if
% stack: dict mark count
dup 0 eq
{ pop 1 index }
{ 2 index /Count knownoget { 0 lt { neg } if } if
/Count exch 3 index
}
ifelse
{
dup /A knownoget {
dup /URI known {
/A mark 3 2 roll % <<>> /A [ <<action>>
{ oforce } forall
.dicttomark
3 2 roll
} {
dup /D knownoget {
exch pop exch dup length dict copy dup /Dest 4 -1 roll put
} {
/N knownoget { % Assume /S /Named
namedactions exch .knownget { exec } if
} if
} ifelse
} ifelse
} if
linkdest
} stopped
{
cleartomark % ignore this link
( **** Warning: Outline has invalid link that was discarded.\n)
pdfformaterror
} {
/Title oget /Title exch /OUT pdfmark
}
ifelse
/First knownoget
{ { dup writeoutline /Next knownoget not { exit } if } loop }
if
} bind def
% Close a PDF file.
/pdfclose % <dict> pdfclose -
{ begin
PDFfile closefile
end
} bind def
% ======================== Page accessing ======================== %
% Get a (possibly inherited) attribute of a page.
/pget % <pagedict> <key> pget <value> -true-
% <pagedict> <key> pget -false-
{
2 copy knownoget
{ exch pop exch pop true }
{ exch /Parent knownoget
{ exch pget }
% finally see if the key is (misplaced) in the Root Catalog dict
{ dup Trailer /Root oget exch knownoget dup {
3 -1 roll ( **** Warning: The /) pdfformaterror 50 string cvs pdfformaterror
( key is missing from the Page tree.\n) pdfformaterror
}
{ exch pop }
ifelse
}
ifelse
}
ifelse
} bind def
% Get the value of a resource on a given page.
/rget { % <resname> <pagedict> <restype> rget <value> -true-
% <resname> <pagedict> <restype> rget -false-
LocalResources 1 index knownoget {
3 index knownoget
} {
false
} ifelse {
exch pop exch pop exch pop true
} {
exch /Resources pget {
exch knownoget { exch knownoget } { pop false } ifelse
} {
pop pop false
} ifelse
} ifelse
} bind def
% Get the total number of pages in the document.
/pdfpagecount % - pdfpagecount <int>
{ Trailer /Root oget /Pages oget
dup /Count knownoget {
dup 0 le {
pop
dup /Kids knownoget {
pop
( **** Warning: Invalid Page count.\n) pdfformaterror
% find the last page and use that as the Count
1 1 999999999 {
dup pdffindpage?
exch pop
//null eq { exit } { pop } ifelse
} for
1 sub % decrement to last page that we were able to find
2 copy /Count exch put
} {
0 % return 0 and keep 0 page count.
( **** Warning: PDF document has no pages.\n) pdfformaterror
} ifelse
} if
exch pop
} {
dup /Type oget /Page eq {
<< exch 1 array astore /Kids exch /Count 1 /Type /Pages >>
Trailer /Root oget /Pages 3 -1 roll put
1
( **** Warning: No /Pages node. The document root directly point a page.\n)
pdfformaterror
} {
( **** Warning: Page count not found; assuming 1.\n)
pdfformaterror
pop 1
} ifelse
} ifelse
} bind def
% Check for loops in the 'page tree' but accept an acyclic graph.
% - verify_page_tree -
/verify_page_tree {
Trailer /Root oget /Pages oget
10 dict begin
/verify_page_tree_recursive {
dup 1 def
dup /Kids knownoget {
{ oforce
currentdict 1 index known {
( **** Error: there's a loop in the page tree. Giving up.\n) pdfformaterror
/verify_page_tree cvx /syntaxerror signalerror
} if
verify_page_tree_recursive
} forall
} if
currentdict exch undef
} def
verify_page_tree_recursive
end
} bind def
/pdffindpage? { % <int> pdffindpage? 1 null (page not found)
% <int> pdffindpage? 1 noderef (page found)
% <int> pdffindpage? 0 null (Error: page not found)
Trailer /Root oget /Pages get
{ % We should be able to tell when we reach a leaf
% by finding a Type unequal to /Pages. Unfortunately,
% some files distributed by Adobe lack the Type key
% in some of the Pages nodes! Instead, we check for Kids.
dup oforce /Kids knownoget not { exit } if
exch pop null
0 1 3 index length 1 sub {
2 index exch get
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
} for exch pop
% Stack: index null|noderef
dup null eq { pop pop 1 null exit } if
} loop
} bind def
% Find the N'th page of the document by iterating through the Pages tree.
% The first page is numbered 1.
/pdffindpageref { % <int> pdffindpage <objref>
dup pdffindpage?
% Stack: index countleft noderef
1 index 1 ne { pop pop /pdffindpage cvx /rangecheck signalerror } if
exch pop
PageIndex 2 index 1 sub 65533 .min 2 index oforce put
PageNumbers 1 index oforce 3 index dup 65534 le
{ put }
{ pop pop pop } % don't store more than 65534 pagenumbers
ifelse
exch pop
} bind def
/pdffindpage { % <int> pdffindpage <pagedict>
pdffindpageref oforce
} bind def
% Find the N'th page of the document.
% The first page is numbered 1.
/pdfgetpage % <int> pdfgetpage <pagedict>
{ PageIndex 1 index 1 sub dup 65533 lt
{ get }
{ pop pop null }
ifelse
dup null ne
{ exch pop oforce }
{ pop pdffindpage }
ifelse
} bind def
% Find the page number of a page object (inverse of pdfgetpage).
/pdfpagenumber % <pagedict> pdfpagenumber <int>
{ % We use the simplest and stupidest of all possible algorithms....
PageNumbers 1 index .knownget
{ exch pop
}
{ 1 1 PageCount 1 add % will give a rangecheck if not found
{ dup pdfgetpage oforce 2 index eq { exit } if pop
}
for exch pop
}
ifelse
} bind def
% Arrange the four elements that define a rectangle into a 'normal' order.
/normrect_elems % <x1> <y1> <x2> <y2> normrect_elems <llx> <lly> <urx> <ury>
{
exch 4 1 roll % <x2> <x1> <y1> <y2>
2 copy gt { exch } if % <x2> <x1> <lly> <ury>
4 2 roll 2 copy lt { exch } if % <lly> <ury> <urx> <llx>
4 1 roll exch % <llx> <lly> <urx> <ury>
} bind def
% Arrange a rectangle into a 'normal' order. I.e the lower left corner
% followed by the upper right corner.
/normrect % <rect> normrect <rect>
{
aload pop normrect_elems 4 array astore
} bind def
/fix_empty_rect_elems % </Name> <x1> <y1> <x2> <y2> fix_empty_rect_elems <x1> <y1> <x2'> <y2'>
{ dup 3 index eq { //true } { 1 index 4 index eq } ifelse {
pop pop pop pop
( **** Warning: File has an empty ) pdfformaterror pdfstring cvs pdfformaterror
(. Using the current page size instead.\n) pdfformaterror
0 0 currentpagedevice /PageSize get aload pop
} {
5 -1 roll pop
} ifelse
} bind def
/boxrect % <llx> <lly> <urx> <ury> boxrect <x> <y> <w> <h>
{ exch 3 index sub exch 2 index sub
} bind def
/resolvedest { % <name|string|other> resolvedest <other|null>
dup type /nametype eq {
Trailer /Root oget /Dests knownoget {
exch knownoget not { null } if
} {
pop null
} ifelse
} {
dup type /stringtype eq {
Trailer /Root oget /Names knownoget {
/Dests knownoget {
exch nameoget
} {
pop null
} ifelse
} {
pop null
} ifelse
} if
} ifelse
} bind def
% Procedures to do the necessary transformations of view destinations
% <PDF2PS_matrix> <rot> <view> -- <view'>
/viewdestprocs 8 dict dup begin
/Fit { exch pop exch pop } bind def
/FitH {
aload pop
0 4 -1 roll 1 and 0 eq { exch } if
4 -1 roll transform exch pop
2 array astore
} bind def
/FitV {
aload pop
0 4 -1 roll 1 and 0 ne { exch } if
4 -1 roll transform pop
2 array astore
} bind def
/FitB /Fit load def
/FitBH /FitH load def
/FitBV /FitV load def
/XYZ {
aload pop
3 1 roll
2 copy 7 -1 roll 1 and 0 ne { exch } if 4 2 roll % odd rotation switches x<->y
2 { dup null eq { pop 0 } if exch } repeat % replace nulls with 0
7 -1 roll transform % transform coordinates
2 { 3 -1 roll null eq { pop null } if exch } repeat % put the nulls back
3 -1 roll
4 array astore
} bind def
/FitR {
exch pop
aload pop
2 { 5 index transform 4 2 roll } repeat normrect_elems
5 array astore
exch pop
} bind def
end readonly def
/linkdest { % <link|outline> linkdest
% ([/Page <n>] /View <view> | ) <link|outline>
dup /Dest knownoget
{ resolvedest
dup type /dicttype eq { /D knownoget not { null } if } if
dup null eq
{ pop }
{ dup 0 oget
false % don't have a page# and transformation matrix (yet)
1 index type /dicttype eq {
1 index /Type knownoget {
/Page eq {
pop % the "false" flag
dup pdf_cached_PDF2PS_matrix exch
dup /Rotate pget not { 0 } if 90 idiv exch
pdfpagenumber
true % now we have a page# and a transformation matrix
} if
} if
} if
% stack: <link|outline> <dest> ( <PDF2PS_matrix> <rot> <page#> true | <page> false )
{
/Page exch 6 2 roll
% stack: [/Page <page#>] <link|outline> <dest> <PDF2PS_matrix> <rot>
3 -1 roll dup length 1 sub 1 exch getinterval /View 4 1 roll
% stack: [/Page <page#>] <link|outline> /View <PDF2PS_matrix> <rot> <view>
//viewdestprocs 1 index 0 get get exec
3 -1 roll
} {
pop
dup length 1 sub 1 exch getinterval /View exch 3 -1 roll
} ifelse
}
ifelse
}
if
} bind def
% <pagedict> mark ... -proc- <page#> <error>
/namedactions 8 dict dup begin
/FirstPage { 1 //false } def
/LastPage { pdfpagecount //false } def
/NextPage { counttomark 2 add index pdfpagenumber 1 add dup pdfpagecount gt } bind def
/PrevPage { counttomark 2 add index pdfpagenumber 1 sub dup 1 lt } bind def
end readonly def
% <pagedict> <annotdict> -proc- -
/annottypes 5 dict dup begin
/Text {
mark exch
{ /Rect /Open /Contents }
{ 2 copy knownoget { 3 -1 roll } { pop } ifelse }
forall pop /ANN pdfmark
} bind def
/Link {
mark exch
dup /C knownoget { /Color exch 3 -1 roll } if
dup /Rect knownoget { /Rect exch 3 -1 roll } if
dup /Border knownoget {
dup type /arraytype eq {
dup length 3 lt
} {
//true
} ifelse {
pop [ 0 0 0 ] % Following AR5 use invisible border.
} if
/Border exch 3 -1 roll
} if
dup /A knownoget {
dup /URI known {
/A mark 3 2 roll % <<>> /A [ <<action>>
{ oforce } forall
.dicttomark
3 2 roll
} {
dup /D knownoget {
exch pop exch dup length dict copy dup /Dest 4 -1 roll put
} {
/N knownoget { % Assume /S /Named
namedactions exch .knownget {
exec {
pop
( **** Warning: Ignoring a named action pointing out of the document page range.\n)
pdfformaterror
} {
/Page exch 3 -1 roll
} ifelse
} if
} if
} ifelse
} ifelse
} if
linkdest pop /LNK pdfmark
} bind def
end readonly def
% **** The following procedure should not be changed to allow clients
% **** to directly interface with the constituent procedures. GSview
% **** and some Artifex customers rely on the pdfshowpage_init,
% **** pdfshowpage_setpage, pdfshowpage_finish so all logic should be
% **** implemented in one of those three procedures.
/pdfshowpage % <pagedict> pdfshowpage -
{ dup /Page exch store
pdfshowpage_init
pdfshowpage_setpage
pdfshowpage_finish
} bind def
/pdfpagecontents % <pagedict> pdfpagecontents <contents>
{ } bind def
/pdfshowpage_init % <pagedict> pdfshowpage_init <pagedict>
{ /DSCPageCount DSCPageCount 1 add store
} bind def
/get_media_box { % <pagedict> get_media_box <box>
/MediaBox pget not {
( **** Page has no /MediaBox attribute. Using the current page size.\n)
pdfformaterror
[ 0 0 currentpagedevice /PageSize get aload pop ]
} if
} bind def
/get_any_box { % <pagedict> get_any_box <box name> <box>
//systemdict /UseTrimBox .knownget dup { and } if {
/TrimBox pget { /TrimBox exch } if
} if
dup type /arraytype ne {
//systemdict /UseCropBox .knownget dup { and } if {
/CropBox pget { /CropBox exch } if
} if
} if
dup type /arraytype ne {
/MediaBox exch get_media_box
} if
} bind def
% Compute the matrix that transforms the PDF->PS "default" user space
/pdf_PDF2PS_matrix { % <pdfpagedict> -- matrix
matrix currentmatrix matrix setmatrix exch
% stack: savedCTM <pdfpagedict>
dup get_any_box
% stack: savedCTM <pdfpagedict> /Trim|Crop|MediaBox <Trim|Crop|Media Box>
oforce_elems normrect_elems fix_empty_rect_elems 4 array astore
//systemdict /PDFFitPage known {
PDFDEBUG { (Fiting PDF to imageable area of the page.) = flush } if
currentpagedevice /.HWMargins get aload pop
currentpagedevice /PageSize get aload pop
% Adjust PageSize and .HWMargins for the page portrait/landscape orientation
2 copy gt
7 index aload pop 3 -1 roll sub 3 1 roll exch sub exch
10 index /Rotate pget not { 0 } if 90 idiv 1 and 0 ne { exch } if
gt
ne {
2 copy ne {
% rotate the .HWMargins
2 copy lt {
6 2 roll 4 -1 roll 6 -2 roll
} {
6 2 roll 4 1 roll 6 -2 roll
} ifelse
% rotate the page dimensions
exch
} if
} if
3 -1 roll sub 3 1 roll exch sub exch
% stack: savedCTM <pdfpagedict> <Crop|Media Box> Xmin Ymin Xmax Ymax
PDFDEBUG { ( Translate up by [ ) print 3 index =print (, ) print 2 index =print ( ]) = flush } if
3 index 3 index translate % move origin up to imageable area
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 90 idiv 1 and 0 ne { exch } if
% stack: savedCTM <pdfpagedict> [Box] XImageable YImageable XBox YBox
3 -1 roll exch div 3 1 roll div .min
PDFDEBUG { ( Scale by ) print dup = flush } if
} {
//systemdict /NoUserUnit .knownget not { false } if {
1
} {
1 index /UserUnit knownoget {
PDFDEBUG { (Scaling due to UserUnit by ) print dup = flush } if
} {
1
} ifelse
} ifelse
} ifelse
% stack: savedCTM <pdfpagedict> [Box] scale
dup scale
% Rotate according to /Rotate
aload pop boxrect
{
{ pop pop }
{ -90 rotate pop neg 0 translate }
{ 180 rotate neg exch neg exch translate }
{ 90 rotate neg 0 exch translate pop }
}
5 index /Rotate pget not { 0 } if
PDFDEBUG { dup 0 ne { (Rotating by ) print dup =print ( degrees.) = flush } if } if
90 idiv 3 and get exec
% Now translate to the origin given in the Crop|Media Box
exch neg exch neg translate
% stack: savedCTM <pdfpagedict>
pop
matrix currentmatrix exch setmatrix
} bind def
% Cache the matrix that transforms the PDF->PS "default" user space
% into <pdfpagedict> under the key //PDF2PS_matrix_key, then return it
/PDF2PS_matrix_key (PDF->PS matrix) cvn def
/pdf_cached_PDF2PS_matrix { % <pdfpagedict> -- <PDF2PS_matrix>
dup //PDF2PS_matrix_key .knownget {
exch pop
} {
dup dup pdf_PDF2PS_matrix //PDF2PS_matrix_key exch put
//PDF2PS_matrix_key get
} ifelse
} bind def
currentdict /PDF2PS_matrix_key undef
/.pdfshowpage_Install { % <pagedict> [<prevproc>] .pdfshowpage_Install -
0 get exec
pdf_cached_PDF2PS_matrix concat
} bind def
/pdfshowpage_setpage { % <pagedict> pdfshowpage_setpage <pagedict>
6 dict begin % for setpagedevice
% Stack: pdfpagedict
% UseCIEColor is always true for PDF; see the comment in runpdf above
/UseCIEColor true def
/Orientation 0 def
currentpagedevice
% Stack: pdfpagedict currentpagedevicedict
1 index get_any_box
% Stack: pdfpagedict currentpagedevicedict /BoxName [box]
oforce_elems normrect_elems fix_empty_rect_elems boxrect 4 2 roll pop pop
3 index /Rotate pget not { 0 } if 90 idiv 1 and 0 ne { exch } if
% stack: pdfpagedict currentpagedevicedict boxwidth boxheight
//systemdict /PDFFitPage known {
% Preserve page size,
% but choose portrait/landscape depending on box width:height ratio
% (if box width == height, select portrait orientation)
gt
1 index /PageSize get aload pop
2 copy gt
4 -1 roll ne { exch } if
} {
% Set the page size.
//systemdict /NoUserUnit .knownget not { false } if not {
3 index /UserUnit knownoget {
dup 4 -1 roll mul 3 1 roll mul
} if
} if
} ifelse
2 array astore /PageSize exch def
% 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.
/PageSpotColors 2 index countspotcolors def
% Let the device know if we will be using PDF 1.4 transparency.
% The clist logic may need to adjust the size of bands.
1 index pageusestransparency /PageUsesTransparency exch def
dup /Install .knownget {
% Don't let the Install procedure get more deeply
% nested after every page.
dup type dup /arraytype eq exch /packedarraytype eq or {
dup length 4 eq {
dup 2 get /.pdfshowpage_Install load eq {
1 get 0 get % previous procedure
} if
} if
} if
} {
{ }
} ifelse 1 array astore
2 index exch /.pdfshowpage_Install load /exec load
4 packedarray cvx
% Stack: pagedict currentpagedict installproc
/Install exch def
% Stack: pagedict currentpagedict
pop currentdict end setpagedevice
} bind def
/.free_page_resources { % - .free_page_resources -
Page /Resources pget {
/Shading knownoget {
{ dup type /dicttype eq {
dup /.shading_dict known {
dup /.shading_dict undef
} if
} if
pop pop
} forall
} if
} if
} bind def
/pdfshowpage_finish { % <pagedict> pdfshowpage_finish -
save /PDFSave exch store
/PDFdictstackcount countdictstack store
(before exec) VMDEBUG
% set up color space substitution (this must be inside the page save)
pdfshowpage_setcspacesub
.writepdfmarks {
% Copy the crop box.
dup /CropBox pget {
% .pdfshowpage_Install transforms the user space -
% do same here with the CropBox.
oforce_elems
2 { Page pdf_cached_PDF2PS_matrix transform 4 2 roll } repeat
normrect_elems /CropBox 5 1 roll fix_empty_rect_elems 4 array astore
mark /CropBox 3 -1 roll
/PAGE pdfmark
} if
% Copy annotations and links.
dup /Annots knownoget {
0 1 2 index length 1 sub
{ 1 index exch oget
dup type /dicttype eq {
dup /Subtype oget annottypes exch .knownget { exec } { pop } ifelse
} {
pop
} ifelse
}
for pop
} if
} if % end .writepdfmarks
% Display the actual page contents.
6 dict begin
/BXlevel 0 def
/BGDefault currentblackgeneration def
/UCRDefault currentundercolorremoval def
%****** DOESN'T HANDLE COLOR TRANSFER YET ******
/TRDefault currenttransfer def
matrix currentmatrix 2 dict
2 index /CropBox pget {
oforce_elems normrect_elems boxrect
4 array astore 1 index /ClipRect 3 -1 roll put
} if
dictbeginpage setmatrix
/DefaultQstate qstate store
count 1 sub /pdfemptycount exch store
% If the page uses any transparency features, show it within
% a transparency group.
dup pageusestransparency dup /PDFusingtransparency exch def {
% Show the page within a PDF 1.4 device filter.
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)
dup /Group knownoget {
1 index /CropBox pget {
/CropBox exch
} {
1 index get_media_box /MediaBox exch
} ifelse
oforce_elems normrect_elems fix_empty_rect_elems 4 array astore .beginformgroup {
showpagecontents
} stopped {
.discardtransparencygroup stop
} if .endtransparencygroup
} {
showpagecontents
} ifelse
} stopped {
% todo: discard
.poppdf14devicefilter
/DefaultQstate qstate store % device has changed -- reset DefaultQstate
stop
} if .poppdf14devicefilter
/DefaultQstate qstate store % device has changed -- reset DefaultQstate
} {
showpagecontents
} ifelse
.free_page_resources
% todo: mixing drawing ops outside the device filter could cause
% problems, for example with the pnga device.
endpage
end % scratch dict
% Indicate that the number of spot colors is unknown in case the next page
% imaged is a PS file.
<< /PageSpotColors -1 >> .setpagedevice
% Some PDF files don't have matching q/Q (gsave/grestore) so we need
% to clean up any left over dicts from the dictstack
countdictstack PDFdictstackcount sub dup 0 ne {
( **** Warning: File has unbalanced q/Q operators \(too many q's\)\n)
pdfformaterror
{ end } repeat
} {
pop
} ifelse
(after exec) VMDEBUG
Repaired % pass Repaired state around the restore
PDFSave restore
/Repaired exch def
} bind def
% Display the contents of a page (including annotations).
/showpagecontents { % <pagedict> showpagecontents -
dup % Save the pagedict for the Annotations
count 1 sub /pdfemptycount exch store
gsave % preserve gstate for Annotations later
/Contents knownoget not { 0 array } if
dup type /arraytype ne { 1 array astore } if {
oforce false resolvestream pdfopdict .pdfrun
} forall
% check for extra garbage on the ostack and clean it up
count pdfemptycount sub dup 0 ne {
( **** File did not complete the page properly and may be damaged.\n)
pdfformaterror
{ pop } repeat
} {
pop
} ifelse
grestore
% Draw the annotations
//systemdict /ShowAnnots .knownget not { //true } if {
/Annots knownoget {
{ oforce
dup //null ne {
drawannot
} {
pop
} ifelse
} forall
} if
} if
//systemdict /ShowAcroForm .knownget { //true eq } { //false } ifelse {
Trailer /Root oget /AcroForm knownoget { draw_acro_form } if
} if
} bind def
/processcolorspace { % - processcolorspace <colorspace>
% The following is per the PLRM3.
currentdevice 1 dict dup /ProcessColorModel dup put .getdeviceparams
exch pop exch pop
dup type /nametype ne { cvn } if
dup { setcolorspace } .internalstopped { pop /DeviceRGB } if
} bind def
% ------ Transparency support ------ %
% Define minimum PDF version for checking for transparency features.
% Transparency is a 1.4 feature however we have seen files that claimed
% to be PDF 1.2 with transparency features. Bug 689288.
/PDFtransparencyversion 1.2 def
% Determine whether a page might invoke any transparency features:
% - Non-default BM, ca, CA, or SMask in an ExtGState
% - Image XObject with SMask
% Note: we deliberately don't check to see whether a Group is defined,
% because Adobe Illustrator 10 (and possibly other applications) define
% a page-level group whether transparency is actually used or not.
% Ignoring the presence of Group is justified because, in the absence
% of any other transparency features, they have no effect.
/pageusestransparency { % <pagedict> pageusestransparency <bool>
PDFversion PDFtransparencyversion lt NOTRANSPARENCY or {
pop //false
} {
dup //false exch {
4 dict 1 index resourceusestransparency { pop not exit } if
/Parent knownoget not { exit } if
} loop
% Also check for transparency in the annotation (if not in resources).
{ pop //true } { annotsusetransparency } ifelse
} ifelse
} bind def
% Check if transparency is specified in an ExtGState dict
/extgstateusestransparency { % <gstate dict> extgstateusestransparency <bool>
//false exch % Assume no transparency
{ % establish loop context
dup /BM knownoget { dup /Normal ne exch /Compatible ne and
{ pop not exit } if
} if
dup /ca knownoget { 1 ne { pop not exit } if } if
dup /CA knownoget { 1 ne { pop not exit } if } if
dup /SMask knownoget { /None ne { pop not exit } if } if
pop exit
} loop
} bind def
% Check if transparency is used in a Pattern
/patternusestransparency { % <Pattern dict> patternusestransparency <bool>
//false exch % Assume no transparency
{
4 dict 1 index resourceusestransparency { pop not exit } if
dup /ExtGState knownoget { extgstateusestransparency { 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.
/resourceusestransparency { % <dict> <dict> resourceusestransparency <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 transparency 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 extgstateusestransparency { pop //true exit } if
} forall
{ pop //true exit } if
} if
dup /Pattern knownoget {
//false exch
{ exch pop oforce patternusestransparency { pop //true exit } if
} forall
{ pop //true exit } if
} if
dup /XObject knownoget {
dup type /dicttype eq {
//false exch {
exch pop oforce dup /Subtype get
dup /Image eq { 1 index /SMask known { pop pop not exit } if } if
/Form eq {
3 index exch resourceusestransparency { not exit } if
} {
pop
} ifelse
} forall { pop //true exit } if
} {
( **** Ignoring non-dictionary /XObject attribute.\n)
pdfformaterror
pop
} ifelse
} 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 transparency
/annotsusetransparency { % <page dict> annotsusetransparency <bool>
//false exch % Assume no transparency
/Annots knownoget { % Get Annots array
{
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 resourceusestransparency { pop //true exit } if
} if
} if % If AP dict known
} {
pop
} ifelse
} forall % For all annots on the page
} if
} bind def
% Add a color name to our spot color list. Ignore /All and /None
/putspotcolor { % <name> <spotcolordict> putspotcolor -
% The 'name' could be a string. If so then convert to a name.
exch dup type /stringtype eq { cvn } if
dup dup /None eq exch /All eq or { pop pop } { 0 put } ifelse
} bind def
% Determine which spot colors are used within a color space Note: This
% dict will include all colors used in Separation or DeviceN color spaces.
% Thus it may include Cyan, Magenta, Yellow, and Black.
% <colorspace> <spotcolordict> colorspacespotcolors -
/colorspacespotcolors {
exch dup type /arraytype eq {
% If we have an Indexed color space then get the base space.
dup 0 oget dup /Indexed eq {
pop 1 oget 2 copy colorspacespotcolors
} {
% 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
pop pop
} bind def
% Check the Resources of a page, form, or annotation. Determine which spot
% colors are used within the resource Note: The spot color dict will include
% all colors used in Separation or DeviceN color spaces. Thus it may include
% Cyan, Magenta, Yellow, and Black. We also pass a dict that is used to check
% for loops in the resource list.
% <spotcolordict> <loopdict> <page/form/annot dict>
% resourcespotcolors <spotcolordict> <loopdict>
/resourcespotcolors {
{ % Use loop to provide an exitable context.
% Exit if no Resources entry
/Resources knownoget not { exit } if
% Exit if we have already seen this dict
2 copy known { pop exit } if
% Save the Resources dict into our loop checking dict.
2 copy 0 put
% Scan resources that might contain a color space.
dup /ColorSpace knownoget {
{ exch pop oforce 3 index colorspacespotcolors } forall
} if
dup /Pattern knownoget {
{ exch pop oforce 4 copy exch pop resourcespotcolors pop pop pop } forall
} if
dup /Shading knownoget {
{ exch pop oforce /ColorSpace oget 3 index colorspacespotcolors } forall
} if
/XObject knownoget {
dup type /dicttype eq {
{ exch pop oforce dup
/Subtype get /Form eq { resourcespotcolors } { pop } ifelse
} forall
} {
pop % Just ignore here, already reported by resourceusestransparency.
} ifelse
} if
exit
} loop
} bind def
% Determine which spot colors are used within the annotations. Note: This
% dict will include all colors used in Separation or DeviceN color spaces.
% Thus it may include Cyan, Magenta, Yellow, and Black.
% <spotcolordict> <loopdict> <annotsarray>
% annotsspotcolors <spotcolordict> <loopdict>
/annotsspotcolors {
{ oforce
dup //null ne {
/AP knownoget { % Get appearance dict for the annoation
/N knownogetdict { % Get the /N (i.e. normal) appearance stream
resourcespotcolors
} if % If normal appearance streamknown
} if % If AP dict known
} {
pop
} ifelse
} forall
} bind def
% Determine spot colors are used within a page. We are creating a dict to
% hold the spot color names as keys. Using a dict avoids having to worry
% about duplicate entries. The keys in the dict contain the spot color
% names. However the values have no meaning. Note: This dict will include
% all colors used in Separation or DeviceN color spaces specified in the
% page's resources. Thus it may include Cyan, Magenta, Yellow, and Black.
% There is no attempt to verify that these color spaces are actually used
% within the object streams for the page.
/pagespotcolors { % <pagedict> pagespotcolors <spotcolordict>
dup
% Create a dict to hold spot color names.
0 dict exch
% Create a dict to be used to check for reference loops.
4 dict exch
% Check for color spaces in the Resources
resourcespotcolors
% Also check for color spaces in the annotations.
3 -1 roll
/Annots knownoget { annotsspotcolors } if
pop % Discard reference loop dict
} bind def
% Determine how many (if any) spot colors are used by a page.
% Note: This count does not include Cyan, Magenta, Yellow, or Black
/countspotcolors { % <pagedict> countspotcolors <count>
pagespotcolors % Get dict with all spot colors
dup length % spot color dict length
% Remove CMYK from the spot color count.
[ /Cyan /Magenta /Yellow /Black ]
{ 2 index exch known { 1 sub } if } forall
exch pop % Remove spot color dict
} bind def
% ------ ColorSpace substitution support ------ %
%
% <pagedict> pdfshowpage_setcspacesub <pagedict>
%
% Set up color space substitution for a page. Invocations of this procedure
% must be bracketed by the save/restore operation for the page, to avoid
% unintended effects on other pages.
%
% If any color space substitution is used, and the current color space is a
% device dependent color space, make sure the current color space is updated.
% There is an optimization in the setcolorspace pseudo-operator that does
% nothing if both the current and operand color spaces are the same. For
% PostScript this optimization is disabled if the UseCIEColor page device
% parameter is true. This is not the case for PDF, as performance suffers
% significantly on some PDF files if color spaces are set repeatedly. Hence,
% if color space substitution is to be used, and the current color space
% is a device dependent color space, we must make sure to "transition" the
% current color space.
%
/pdfshowpage_setcspacesub
{
false
{ /DefaultGray /DefaultRGB /DefaultCMYK }
{
dup 3 index /ColorSpace //rget exec
{ resolvecolorspace /ColorSpace defineresource pop }
{ pop }
ifelse
}
forall
% if using color space substitution, "transition" the current color space
{
currentcolorspace dup length 1 eq % always an array
{
0 get
dup /DeviceGray eq 1 index /DeviceRGB eq or 1 index /DeviceCMYK or
{ /Pattern setcolorspace setcolorspace }
{ pop }
ifelse
}
{ pop }
if
}
if
}
bind def
% Write OutputIntents to device if the device handles it
/writeoutputintents {
currentdevice 1 dict dup /OutputIntent //null put readonly
.getdeviceparams
mark ne { pop pop
% device supports OutputIntent parameter
Trailer /Root oget /OutputIntents knownoget {
dup type /arraytype eq {
{ % process all output profiles present
oforce
dup length dict .copydict
dup /DestOutputProfile knownoget {
PDFfile fileposition exch
mark exch { oforce } forall .dicttomark
//true resolvestream
[ { counttomark 1 add index
64000 string readstring
not { exit } if
} loop
] exch closefile
0 1 index { length add } forall .bytestring
0 3 2 roll {
3 copy putinterval
length add
} forall pop
exch PDFfile exch setfileposition
1 index /DestOutputProfile 3 2 roll put
} if
% Convert to string array because it's easier for the device
[ 1 index /OutputCondition knownoget not { () } if
2 index /OutputConditionIdentifier knownoget not { () } if
3 index /RegistryName knownoget not { () } if
4 index /Info knownoget not { () } if
5 index /DestOutputProfile knownoget not { () } if
]
[ /OutputIntent 3 2 roll .pdfputparams pop pop
pop % done with this OutputIntent dictionary
} forall
} {
pop
( **** Warning: OutputIntent attribute of a wrong type is ignored.\n)
pdfformaterror
} ifelse
} if % OutputIntents known
% tell device there are no more OutputIntents
[ /OutputIntent [ ] .pdfputparams pop pop
} if
} bind def
end % pdfdict
.setglobal
@KyuuKazami