Edit File: 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 6300 2005-12-28 19:56:24Z giles $ % 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
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