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% Copyright (C) 2001-2019 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.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% Print Linearized PDF hint streams

% Utilities
/read1 {	% <file> read1 <value>
  read not {
    (**** Unexpected EOF) = flush quit
  } if
} bind def
/read2 {	% <file> read2 <value>
  dup read1 8 bitshift exch read1 add
} bind def
/read4 {	% <file> read4 <value>
  dup read2 16 bitshift exch read2 add
} bind def
% Free variables: Bits, Bitsleft
/readninit {	% - <readninit> -
  /Bits 0 def
  /Bitsleft 0 def
} bind def

/pdftoken {	% <file> pdftoken <token>
  dup token pop
  dup type /nametype eq 1 index xcheck and {
    dup dup (<<) cvn eq exch ([) eq or {
      exec exch {
        dup pdftoken dup dup (>>) cvn eq exch (]) eq or {
          exch pop exec exit
        } if exch
      } loop
    } {
      exch pop
    } ifelse
  } {
    exch pop
  } ifelse
} bind def
/makemask {	% <nbits> makemask <mask>
  1 exch bitshift 1 sub
} bind def
/readn {	% <file> <nbits> readn <value>
  dup Bitsleft le {
    exch pop
    /Bitsleft Bitsleft 2 index sub def
    makemask Bits Bitsleft neg bitshift and
  } {
    Bitsleft makemask Bits and
    exch Bitsleft sub exch 1 index bitshift 3 1 roll
    /Bits 2 index read1 def /Bitsleft 8 def
    readn add
  } ifelse
} bind def
/sread {	% <string> sread <file>
  0 () /SubFileDecode filter
} bind def

/ptag {		% <pre-tag> <proc> <post-tag> ptag -
  3 -1 roll print (: ) print
  exch exec
  (        % ) print =
} bind def

% Print the linearization parameters dictionary.
/plpkeys <<
  /E (end of p. 1 objects)
  /L (total file length)
  /H (PHS start + length)
  /N (# of pages)
  /O (p. 1 object #)
  /T (offset of first main xref entry)
>> def
/plpdict {	% <dict> plpdict -
  (<<) = plpkeys {
    2 index 2 index .knownget {
        % Stack: dict key label value
      (  ) print 3 -1 roll ===only ( ) print ===only
      (        % ) print =
    } {
      pop pop
    } ifelse
  } forall {
    plpkeys 2 index known {
      pop pop
    } {
      (  ) print exch ===only ( ) print ===
    } ifelse
  } forall (>>) =
} bind def

% Print the Page Offset Hint Table.
/ppoht {	% <npages> <file> ppoht -

  20 dict begin
  /f exch def
  /npages exch def
  readninit

  (1) { f read4 =only } (least # objs/page) ptag
  (2) { f read4 =only } (offset of p. 1 object (+PHS length if beyond PHS)) ptag
  (3) { f read2 dup =only /nb3 exch def } (# bits for # objs/page delta) ptag
  (4) { f read4 =only } (least # bytes/page) ptag
  (5) { f read2 dup =only /nb5 exch def } (# bits for # bytes/page delta) ptag
  (6) { f read4 =only } (least content stream offset-in-page) ptag
  (7) { f read2 dup =only /nb7 exch def } (# bits for content stream offset delta) ptag
  (8) { f read4 =only } (least content stream length) ptag
  (9) { f read2 dup =only /nb9 exch def } (# bits for content stream length delta) ptag
  (10) { f read2 dup =only /nb10 exch def } (# bits for # of shared obj refs) ptag
  (11) { f read2 dup =only /nb11 exch def } (# bits for shared obj indices) ptag
  (12) { f read2 dup =only /nb12 exch def } (# bits for shared obj ref pos numerators) ptag
  (13) { f read2 =only } (shared obj ref pos denominator) ptag

  (*1) { [ npages { f nb3 readn } repeat ] ==only } (# objs/page deltas (see 1,3)) ptag
  (*2) { [ npages { f nb5 readn } repeat ] ==only } (# bytes/page deltas (see 4,5)) ptag
  (*3) { [ npages { f nb10 readn } repeat ] dup ==only /nso exch def } (# of shared obj refs (see 10)) ptag
  (*4) { [ nso { [ exch { f nb11 readn } repeat ] } forall ] ==only } (shared obj indices (see 11)) ptag
  (*5) { [ nso { [ exch { f nb12 readn } repeat ] } forall ] ==only } (shared obj ref pos numerators (see 12)) ptag
  (*6) { [ npages { f nb7 readn } repeat ] ==only } (content stream offset-in-page deltas (see 6,7)) ptag
  (*7) { [ npages { f nb9 readn } repeat ] ==only } (content stream length deltas (see 8,9)) ptag

  end		% temp dict

} bind def

% Print the Shared Objects Hint Table.
/psoht {	% <file> psoht -

  20 dict begin
  /f exch def
  readninit

  (1) { f read4 =only } (first shared obj #) ptag
  (2) { f read4 =only } (first shared obj offset (+PHS length if beyond PHS)) ptag
  (3) { f read4 dup =only /n3 exch def } (# of p. 1 shared objs) ptag
  (4) { f read4 dup =only /n4 exch def } (total # of shared objs) ptag
  (5) { f read2 dup =only /nb5 exch def } (# bits for # of shared objs/group) ptag
  (6) { f read4 =only } (least shared obj group length) ptag
  (7) { f read2 dup =only /nb7 exch def } (# bits for shared obj group length delta) ptag

  /nse n4 def
  (*1) { [ nse { f nb7 readn } repeat ] ==only } (shared obj group length deltas (see 6,7)) ptag
  (*2) { [ nse { f 1 readn } repeat ] dup ==only /md5s exch def } (MD5 present?) ptag
  (*3:) = md5s {
    0 ne {
      (  ) print f 16 string readstring pop
      (%stdout) (w) file dup 3 -1 roll writehexstring closefile () =
    } if
  } forall
  (*4) { [ nse { f nb5 readn } repeat ] ==only } (# objs/group (see 5)) ptag

  end		% temp dict

} bind def

% Print the Primary Hint Stream of a PDF file.
/pphs {		% <file> pphs -
  /pdf exch def

        % Read the linearization parameter dictionary.
  { pdf pdftoken /obj eq { exit } if } loop
  pdf pdftoken /lpdict exch def
  /lpdict type /dicttype eq { lpdict /Linearized known } { false } ifelse {
    (Not a linearized PDF file.) = stop
  } if

  lpdict plpdict flush

        % Read the primary hint stream.
  null {
    pdf pdftoken dup /stream eq { pop exit } if
    exch pop
  } loop
  /phsdict exch def
        % Remove Length if indirect reference.
  phsdict 0 known {
    phsdict 0 undef  phsdict /Length undef
  } if
  (PHS: ) print phsdict === flush
  pdf 0 (endstream) /SubFileDecode filter
  dup 64000 string readstring pop exch closefile
  sread /phsdata exch def

        % Decode the hint stream data if necessary.
  phsdict /Filter .knownget {
    phsdata exch filter
    dup 5000 string readstring pop exch closefile
    sread /phsdata exch def
  } if

        % Adobe says we can assume /P = 0.
  (Page Offset Hint Table:) =
  lpdict /N get
  phsdata phsdict /S get string readstring pop sread
  ppoht
  (Shared Objects Hint Table:) =
  phsdata psoht
} bind def

% Check for command line arguments.
[ .shellarguments
 { ] dup length 1 eq
    { 0 get (r) file dup pphs closefile }
    { (Usage: pphs filename.pdf\n) print flush }
   ifelse
 }
 { pop }
ifelse