ref: 7134d62ccbb32c783de67d26907e4e856c48f29c
dir: /sys/lib/ghostscript/packfile.ps/
% Copyright (C) 1994, 1995, 1996 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: packfile.ps,v 1.5 2002/06/02 12:03:28 mpsuzuki Exp $
% packfile.ps
% Pack groups of files together, with compression, for use in
% storage-scarce environments.
% ****** NOTE: This file must be kept consistent with gs_pfile.ps.
% ---------------- Huffman coding utilities ---------------- %
% We count runs of zeros, and individual byte frequencies separately
% depending on whether they follow or do not follow a run of zeros.
/zruns 256 array def
/zfreq 256 array def
/nzfreq 256 array def
/maxcode 13 def % max code length, must be between 10 and 16
/maxzrun 100 def % max length of zero run, must be <= 100
/statbuf 10000 string def
% Initialize statistics.
/initstats % - initstats -
{ 0 1 255 { zruns exch 0 put } for
0 1 255 { zfreq exch 0 put } for
0 1 255 { nzfreq exch 0 put } for
} bind def
% Accumulate statistics from an individual file.
/addstats % <file> addstats -
{ 0
{ 1 index //statbuf readstring 3 1 roll
% Stack: file eof numzeros data
{ dup 0 eq
{ pop 1 add
}
{ 1 index 0 ne
{ exch 255 .min
//zruns exch 2 copy get 1 add put
0 exch //zfreq
}
{ //nzfreq
}
ifelse
exch 2 copy get 1 add put
}
ifelse
} forall
exch not { exit } if (.) print flush
} loop
pop closefile
} bind def
% Compute the Huffman codes from the statistics.
/statcodes % - statcodes <array>
{ maxcode 1 add 256 add maxzrun 2 sub add 1 add array % full array
dup maxcode 1 add dup 2 index length exch sub getinterval % data
% Put statistics into array
dup 0 1 255
{ zfreq 1 index get nzfreq 2 index get add put dup
} for
0 zruns 1 get put
256 zruns 2 maxzrun 2 sub getinterval putinterval
dup dup length 1 sub 1 put % EOD
maxcode .computecodes
} bind def
% ---------------- File handling ---------------- %
% Copy one file to another.
% Close the input file, but not the output file.
/copyfile % <infile> <outfile> copyfile <outfile> <length>
{ 0 mark statbuf
{ 4 index 1 index readstring
exch 5 index 1 index writestring
length 5 -1 roll add 4 1 roll
not { exit } if (.) print flush
} loop
cleartomark 3 -1 roll closefile dup == flush
} bind def
% Represent a Type 1 font in its most compressed format.
% Requires -dWRITESYSTEMDICT to run.
% Does not close the output file.
(wrfont.ps) runlibfile
/compressfont % <fontname> <outfile> compressfont <outfile>
{ exch save
systemdict /executeonly /readonly load put
systemdict /noaccess /readonly load put
systemdict readonly pop
wrfont_dict begin
/binary_CharStrings true def
/binary_tokens true def
/encrypt_CharStrings false def
/standard_only false def
/use_lenIV 0 def
/smallest_output true def
end
exch findfont setfont
1 index writefont
restore
} bind def
% ---------------- Main program ---------------- %
% Find the length of a file.
/filelength % <filename> filelength <length>
{ status { pop pop exch pop } { -1 } ifelse
} bind def
% Define the header string for a compressed file.
/beginfilestring
({dup token pop exch[/MaxCodeLength 2 index token pop/Tables 4 index token pop
/EndOfData true/EncodeZeroRuns 256 .dicttomark
/BoundedHuffmanDecode filter/MoveToFrontDecode filter
[/BlockSize 4 -1 roll .dicttomark/BWBlockSortDecode filter
}) readonly def
% Write a 16-bit big-endian non-negative integer on a file.
/write16 % <file> <int> write16 -
{ 2 copy -8 bitshift write 255 and write
} bind def
% Compress a group of files together.
% Return a dictionary in which the keys are the input file names
% and the values are [startpos length] in the uncompressed concatenation.
% Does not open or close the output file.
/tempname (t.em) def
/packfiles % <filenames> <outfile> packfiles <outfile> <posdict>
{ % Concatenate files to a temporary file.
tempname (w) file
dup /MoveToFrontEncode filter
dup <<
/BlockSize 1000000
>> /BWBlockSortEncode filter
% Stack: filenames outfile tempfile mtfe bwe
5 -1 roll dup length dict 0 6 2 roll
{ % Stack: outfile posdict pos tempfile mtfe bwe infilename
dup ==only dup (r) file 2 index copyfile exch pop
dup 7 index 4 2 roll 7 index exch 2 array astore put
5 -1 roll add 4 1 roll
} forall
closefile closefile closefile pop exch
% Stack: posdict outfile
% Compute an optimal Huffman code.
initstats
tempname (r) file addstats
% Actually compress the file.
% Write the decompression information on the output first.
dup tempname filelength write==
dup maxcode write==
% Write the code table as a homogenous number array.
statcodes exch
dup 149 write dup 32 write dup 2 index length write16
exch { 2 copy write16 pop } forall
dup <<
/MaxCodeLength maxcode
/EndOfData true
/EncodeZeroRuns 256
/Tables statcodes
>> /BoundedHuffmanEncode filter
tempname (r) file exch copyfile pop closefile
exch
} bind def
% Squeeze a font to a .cpf file in anticipation of compression.
/squeezefont % <fontname> squeezefont <filename.cpf>
{ dup type /nametype ne { cvn } if
dup
{ dup type /stringtype eq { exit } if
Fontmap exch get
}
loop
% Stack: fontname filename
dup dup
{ (.) search not { exit } if
exch pop exch 3 -1 roll pop
}
loop
% Stack: fontname filename noextname extension
exch
{ (/) search not { (\\) search not { exit } if } if
pop pop
}
loop
% If the font extension is anything other than
% .pfa or .pfb, we assume it can't be rewritten
% using compressfont.
% Stack: fontname filename extension basename
(.cpf) concatstrings dup 5 1 roll (w) file
% Stack: outfilename fontname filename extension outfile
exch dup (pfa) eq exch (pfb) eq or
% Stack: outfilename fontname filename outfile bool
{ exch pop compressfont
}
{ 3 -1 roll pop
exch findlibfile pop exch pop
exch copyfile pop
}
ifelse closefile
} bind def
% ---------------- Production code ---------------- %
% The following code constructs a packed version of the commercial-quality
% fonts available from Aladdin Enterprises. To use this code:
% - If desired, change the output file names below.
% - Make sure you have the synthetic font data (fontmap.shs and the
% *.ps files for the commercial fonts) in a directory that is on
% Ghostscript's search path.
% - Construct the packed fonts by running
% gs -dNODISPLAY -dWRITESYSTEMDICT packfile.ps
% - If desired, move the output files to the directory that will be
% used at run time. You no longer need the *.pfb or *.ps files
% for the original fonts; however, you do still need the Fontmap
% for these fonts, because it defines the font name aliases.
% - Add the following line to the end of gs_fonts.ps:
% (ALL.cmp) run
% (substituting the definition of allmapname if you changed it).
% Define the output file names. The extensions are arbitrary;
% any legal file name is allowed.
/allname (ALL.cff) def % the compressed font file
/allmapname (ALL.cmp) def % the Fontmap override file
% Load an alternate Fontmap that references the synthetic oblique and
% narrow fonts.
true .setglobal
(fontmap.shs) findlibfile pop exch pop .loadFontmap
false .setglobal
% Define the packaging of fonts into font groups.
% Fewer larger groups compress better, but make decompression slower.
/Lists [
[ % The oblique and narrow fonts are synthetic,
% and take very little space.
/AvantGarde-BookOblique /AvantGarde-DemiOblique
/Courier-Oblique /Courier-BoldOblique
/Helvetica-Oblique /Helvetica-BoldOblique
/Helvetica-Narrow /Helvetica-Narrow-Oblique
/Helvetica-Narrow-Bold /Helvetica-Narrow-BoldOblique
]
[/AvantGarde-Book /AvantGarde-Demi
/Bookman-Light] [/Bookman-LightItalic
/Bookman-Demi /Bookman-DemiItalic
/Courier] [/Courier-Bold
/Helvetica /Helvetica-Bold]
[/NewCenturySchlbk-Roman /NewCenturySchlbk-Italic
/NewCenturySchlbk-Bold /NewCenturySchlbk-BoldItalic]
[/Palatino-Roman /Palatino-Italic
/Palatino-Bold /Palatino-BoldItalic]
[/Times-Roman /Times-Italic
/Times-Bold /Times-BoldItalic]
[/Symbol
/ZapfChancery-MediumItalic
/ZapfDingbats]
] def
% We need to register the fonts under their true names, not aliases.
/Lists Lists mark exch
{ mark exch
{ { Fontmap 1 index get dup type /nametype ne { pop exit } if
exch pop
}
loop
}
forall ]
}
forall ] def
% Squeeze the fonts to their .cpf format.
(Squeezing... ) print flush
/fdict mark
Lists
{ { dup squeezefont } forall } forall
.dicttomark def
(done.\n) print flush
% Invert fdict.
/f2dict fdict length dict def
fdict { exch f2dict 3 1 roll put } forall
% Construct the compressed font file.
(Creating ) print allname print (... ) print flush
/posdict fdict length dict def
/all allname (w) file def
all beginfilestring writestring
Lists
{ dup == flush
/fbegin all fileposition def
mark exch { fdict exch get } forall ]
all packfiles exch pop
/flength all fileposition fbegin sub def
{ fbegin flength 3 -1 roll aload pop 4 packedarray
exch f2dict exch get exch posdict 3 1 roll put
}
forall
}
forall
all closefile
(done.\n) print flush
% Write the Fontmap addendum for accessing compressed fonts.
(Writing ) print allmapname print (... ) print flush
allmapname (w) file
dup (%!
/.runpackedlibfile where{pop}{(gs_pfile.ps)runlibfile}ifelse
.currentglobal true .setglobal
) writestring
posdict
{ exch 2 index exch write==only exch dup ({) writestring
dup allname write==only
exch { 1 index dup ( ) writestring exch write==only } forall
dup ( .runpackedlibfile}bind .definefontmap
) writestring
}
forall
dup (.setglobal
) writestring
closefile
(done.\n) print flush