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path: root/graphics/sam2p/l1lzw.psm
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/* l1lzw.psm
 * by pts@fazekas.hu at Sun Sep 22 01:23:57 CEST 2002
 * formerly lzwdecode.psm -- a real, effective implementation of PostScript
 *   LanguageLevel2 and PDF /LZWDecode filters (same as the LZW
 *   compression used in TIFF raster image files), in PostScript Level1
 * derived from lzwdecode.c by pts@fazekas.hu (at Wed Sep  4 11:11:45 CEST 2002)
 * by pts@fazekas.hu at Wed Sep  4 11:30:18 CEST 2002
 * first run at Wed Sep  4 14:18:43 CEST 2002
 * linux-2.2.8 fine at Wed Sep  4 14:46:05 CEST 2002
 * rets linux-2.2.8 fine at Wed Sep  4 15:58:24 CEST 2002
 * works at Wed Sep  4 16:41:29 CEST 2002
 *   linux-2.2.8 58388480 uncompressed:
 *     lzwdecode.c:     17s user time (*1)
 *     lzw_codec.c:      6s user time (*0.353)
 *     lzwdecode.psm: 1080s user time (*63.53)
 * stack-reorg works at Thu Sep  5 12:31:23 CEST 2002
 *     lzwdecode.psm:  980s user time (*57.65)
 * lzwdecode.eps works at Thu Sep  5 14:31:23 CEST 2002
 * last non-` at Sat Sep 21 23:40:03 CEST 2002
 *
 * Note that the LZW compression (but not uncompression) is patented by
 * Unisys (patent number #4,558,302), so use this program at your own legal
 * risk!
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

% OK: test with aaaaaaaaaaaa (stack overflow)

#include "psmlib.psm"

#if USE_A85D
#else
  #if USE_HEXD
  #else
    #define USE_BINARY 1
  #endif
#endif

#if USE_NO_BIND
  #define BIND_DEF def
#else
  #define BIND_DEF bind def
#endif

#if USE_PIN
/* --- .pin begins */

%<Head>
%!PS-Adobe-3.0`E
%%Inflater: pts@fazekas.hu l1lzw.psm
%%Pages: 1
`X%%DocumentData: `B
%%LanguageLevel: 1
`I%%EndComments
%%Page: 1 1
%</Head>

%<Open>
save`s `R
%</Open>

% vvv 50
%<Abbr acount=26 xcount=30>
begin
%</Abbr>

%<A x "load def"/>  % best to make it first
%<A E def/>         % best to make it second
% K: .toksubs.
%<D T .stream./>
%<D F .stream./>

%<A + add/>
%<A , and/>
%<A - sub/>
%<A . lt/>
%<A : for/>
%<A ; getinterval/>
%<A * gt/>
%<A = eq/>
%<A @ loop/>
%<A A currentfile/>
%C!
%D!
%<A H index/>
%<A J 4096/>
%<A L length/>
%<A O pop/>
%S!
%<A X exit/>
%<A a packedarray/>
%<A b bitshift/>
%<A c exch/>
%d!
%<A g get/>
%<A y copy/>
%<A i ifelse/>
%<A j if/>
%<A r read/>
%<A s string/>
%<A t put/>
%<A u dup/>
% %<A | -1670420001/> -- not needed, long enough
%<A ~ ne/>
#if USE_SHORT_NAMES
%<D e Flzwdecode_init/>
%<D f Flzwdecode_do/>
%<D I Fclear/>
%<D k prefix/>
%<D l suffix/>
%<D m stack/>
%<D n preread/>
%<D o past/>
%<D p nentry/>
%<D q had_eof/>
%<D v nentrybig/>
%<D w nentryb/>
%<D h stackslice/>
%<D z gcode/>
%<D B Fmain/>
#endif
#if USE_A85D
%<D d a85_getc/>
%<D S xS/>
%<D D xD/>
%<D C xC/>
#endif
#if USE_HEXD
%<D d .hexd.un/>
%<A S readhexstring/>
%<D D .hexd.un/>
%<D C .hexd./>
#endif
#if USE_BINARY
%<D d .binary.un/>
#if USE_PALETTE
%<D S readstring/>
#endif
%<D D .binary.un/>
%<D C .binary.un/>
#endif

%<TokSubs name=K inlining=0/>

%<Test>
#if USE_BINARY
  /F /filter where {pop false}{true} ifelse def
#else
  #if USE_A85D
    {mark currentfile/ASCII85Decode filter/T exch def}stopped
  #endif
  #if USE_HEXD
    {mark currentfile/ASCIIHexDecode filter/T exch def}stopped
  #endif
  /F exch def cleartomark
#endif
`w `h `b[1 0 0 -1 0 `h]
#if USE_TRUE
true
#else
F
#endif
%</Test>

%<S len=4096>
4096 string
%</S>

#if USE_SHORT_NAMES_OLD
  #define a85_getc d
  #define Flzwdecode_init e
  #define Flzwdecode_do   f
  #define Fclear          I
#endif

#if USE_CURRENTFILE
  #define STDIN currentfile
#endif

%<True>
  % Fmain
  % ^^^ must call it here, because _now_ `currentfile fileposition` is at the real image data
  % vvv avoid Fmain here because of the substituted constant 4717 (and also size increase!)
  Flzwdecode_init
  % !! Imp: less code here, init as a macro
  /Fmain 4096 string def
  { Fmain Flzwdecode_do } `i
  Fmain Flzwdecode_do pop % make sure that mEOD has been read
  TE_read_eod
%</True>

%<False>
#if USE_BINARY
/F currentfile/LZWDecode filter def
#else
/F T/LZWDecode filter def
#endif
F `i
F closefile
#if !USE_BINARY
T closefile
#endif
%</False>

%<Defs>
#else
40 dict begin % LZWDict
#endif

#if 0
% (a) () 0 1
% DumpStack
% TYPE_STACK(-str -int)
% ZZZZZZZZZ
% (a) 3
% ASSERT_STACK(-str -int,(1))
% pop pop
#endif


% Defaults: /EarlyChange 1  /UnitLength 8  /LowBitFirst false
#if !USE_EARLYCHANGE_1
/EarlyChange 1 def
#endif
#if !USE_UNITLENGTH_8
/UnitLength  8 def
#endif
#if !USE_LOWBITFIRST_FALSE
/LowBitFirst false def
#endif

/* OK: test with aaaaaaaaaaaa (stack overflow) */
#define STACKSIZE 4096
#define STACKSIZE_M1 4095

#if USE_SHORT_NAMES_OLD
#endif

% Uninitialized const-vars
/prefix 4096 array def % array[0..4095] of 0..4095
/suffix 4096 string def
/stack  STACKSIZE string def
#if USE_CURRENTFILE
#else
  /STDIN (%stdin) (r) file def
  /STDOUT (%stdout) (w) file def % Fmain
#endif
#if USE_HEXD
  /C(.)def
#endif

% Uninitialized vars
#if USE_UNITLENGTH_8
  #define mClear 256
  #define mEOD 257
#endif
#if !USE_NO_NULLDEF
  /preread null def
  /past null def
  /nentry null def
  /had_eof null def % 0..2
  #if !USE_UNITLENGTH_8
    /mEOD null def
    /mClear null def
  #endif
  /nentrybig null def
  /nentryb null def
  /gcode null def % Flzwdecode_do
  /stackslice null def % Flzwdecode_do
  #if USE_A85D
    /S null def
    /D null def
    /C null def
  #endif
#endif

#if USE_PIN
{
#endif

#if USE_A85D
  /a85_getc{ % Simple getchar() of ASCII85Decode filter :-)), formerly /d
    PSM_A85_GETC
  }BIND_DEF
#endif

%** - Fclear -
/Fclear {
  #if USE_UNITLENGTH_8
    /nentry 258 def
    /nentryb 9 def
    #if USE_EARLYCHANGE_1
      /nentrybig 512 def
    #else
      /nentrybig 513 EarlyChange sub def
    #endif
  #else
    /nentry 1 UnitLength bitshift 2 add def
    /nentryb UnitLength 1 add def
    /nentrybig 1 nentryb bitshift
    #if !USE_EARLYCHANGE_1
      1 EarlyChange sub add
    #endif
    def
  #endif
  0 1 nentry 3 sub {
    % Stack: code(0..255)
    dup prefix exch dup
    % Stack: code prefix code code
    put
    suffix exch dup put
  } for
} BIND_DEF

%** - Flzwdecode_init -
%** The caller should have modified /EarlyChange, /UnitLength and /LowBitFirst
/Flzwdecode_init {
  TE_init
  /past 8 def
  /preread 0 def
  /had_eof 0 def
  #if !USE_EARLYCHANGE_1
    ASSERT_TRUE(EarlyChange 0 INT_EQ EarlyChange 1 INT_EQ BOOL_BIN(or,(ora1)), (lsp->EarlyChange==0 || lsp->EarlyChange==1))
  #endif
  #if USE_UNITLENGTH_8
    Fclear
  #else
    ASSERT_TRUE(3 UnitLength INT_LE UnitLength 8 INT_LE and, (3<=lsp->UnitLength && lsp->UnitLength<=8))
    Fclear
    /mClear 1 UnitLength bitshift def
    /mEOD   1 UnitLength bitshift 1 add def
  #endif
  /stackslice stack 0 0 getinterval def
  /gcode {} def
} BIND_DEF

%** <str> Flzwdecode_do <str.pre>
%** The caller should have called Flzwdecode_init. Flzwdecode_do fills the
%** entire str.pre unless EOF on input prevents this. str.pre can have any
%** length. Doesn`t depend of str.pre passed to it on the previous invocation.
/Flzwdecode_do {
  ASSERT_TRUE(10 nentry INT_LE,(lsp->nentry>=10))
  dup % Silently leave on stack
  stackslice had_eof
  % Stack: reto rets==reto stackslice had_eof
  { % W2:WHILE(1)
    % Stack: len++ stackslice had_eof*
    dup 0 INT_NE {
      /had_eof exch def
      pop
      /stackslice stack 0 0 getinterval def
      exit % exit(W2)
    }if % return(len)
    ASSERT_STACK(-str -str -str -int,(W2.in))
    pop
    % Stack: len++     stackslice
    % Stack: reto rets stackslice
    ASSERT_STACK(-str -str -str,(3))
    /* Flush stack. */
    2 copy length exch length ge { % return from the stack (rets.length<=stackslice.length
      % Stack: reto rets stackslice
      dup 0 3 index length getinterval
      % Stack: reto rets stackslice stackslice[0.. rets.length]
      2 index copy pop
      % Stack: reto rets stackslice
      /stackslice exch 2 index length dup
      % Stack: reto rets /stackslice stackslice rets.length rets.length
      2 index length exch sub
      % Stack: reto rets /stackslice stackslice rets.length stackslice.length-rets.length
      getinterval def
      0 0 getinterval
      % Stack: reto rets[0,0]
      ASSERT_STACK(-str -str,(4))
      exit % exit(W2)
    }if
    % vvv flush the whole stack into rets
    2 copy exch
    copy pop % stackslice -> rets
    length dup
    % Stack: reto rets stackslice.length stackslice.length
    2 index length exch sub
    % Stack: reto rets stackslice.length rets.length-stackslice.length
    getinterval
    % Stack: reto rets
    ASSERT_STACK(-str -str,(5))
    ASSERT_TRUE(dup length 1 exch INT_LE,(len>=1))
    % Stack: len++

    /* Read next code (0..4095) from input to `code` */
    nentry nentrybig INT_EQ {
      /nentryb nentryb 1 add def
      /nentrybig 1 nentryb bitshift
      #if !USE_EARLYCHANGE_1
        1 EarlyChange sub add
      #endif
      def
    }if
    ASSERT_TRUE(4 nentryb INT_LE nentryb 12 INT_LE and, (4<=nentryb && nentryb<=12))
    ASSERT_STACK(-str -str,(6))

    { % W1:WHILE(1)
      ASSERT_STACK(-str -str,(7))
      % Stack: len++
      % assert(had_eof==0); -- cannot check this right here...
      ASSERT_TRUE(1 past INT_LE past 8 INT_LE and,(1<=past && past<=8))
      ASSERT_TRUE(1 nentryb INT_LE nentryb 13 INT_LE and,(1<=nentryb && nentryb<=13))
      #if !USE_LOWBITFIRST_FALSE
       LowBitFirst {
        % Dat: this is untested, even the stack
        /code 0 def
        0 1 netryb 1 sub {
          % Stack: len++ i
          past 8 INT_EQ {
            /preread TE_read(def /past 0 def)
            #if !USE_NO_EOF
             {
              TE_read_pop pop
              /had_eof 2 def exit % exit from inner `for`
             }ifelse
            #endif
          }if
          preread 1 and 0 INT_NE {
            1 exch bitshift code INT_BIN(add,(ora2)) /code exch def
          }{pop}ifelse
          % Stack: len++
          /preread preread -1 bitshift def
          /past past 1 add def
        }for
        had_eof 0 INT_NE {0 had_eof exit}if % exit(W1)
        code
       }{ % else: !LowBitFirst
      #endif
        past nentryb add
        % Stack: len++ past*
        ASSERT_STACK(-str -str -int,(8))
        dup 7 INT_GT {
          dup 16 INT_GT {
            16 sub
            preread 8 bitshift
            % Stack: len++ past* code
            /preread TE_read(def)
            #if !USE_NO_EOF
             {
              TE_read_pop pop
              % Stack: len++ past* code
              pop
              /past exch def
              0 2
              % Stack: len++ garbage had_eof*
              exit % exit(W1)
             }ifelse
            #endif
          }{
            8 sub
            0 % /code
          }ifelse
          % Stack: len++ past* code
          ASSERT_STACK(-str -str -int -int,(9))
          ASSERT_TRUE(1 index 1 exch INT_LE 2 index 8 INT_LE and,(1<=lsp->past && lsp->past<=8))
          preread INT_BIN(add,(or1))
          % Stack: len++ past* code|preread
          1 index bitshift
          % Stack: len++ past* code*==(code|preread)<<past*
          /preread TE_read(def)
          #if !USE_NO_EOF
           {
            TE_read_pop pop
            % Stack: len++ past* code
            pop
            /past exch def
            0 2
            % Stack: len++ garbage had_eof*
            exit % exit(W1)
           }ifelse
          #endif
          ASSERT_STACK(-str -str -int -int,(10))
        }{
          0 % /code
        }ifelse
        exch
        % Stack: len++ code past*
        ASSERT_STACK(-str -str -int -int,(11))
        preread exch 2 copy
        % Stack: len++ code preread0 past* preread past*
        { 255 127 63 31 15 7 3 1 0 } % cAnd
        exch get and
        % Stack: len++ code preread0 past* preread&cAnd[past*]
        /preread exch def % lsp->preread&=(1<<(8-lsp->past))-1; /* do PCLEAR */
        % Stack: len++ code preread0 past*
        dup /past exch def
        8 sub bitshift INT_BIN(add,(or2))
        % Stack: len++ code*==code|(preread>>(8-past))
        ASSERT_STACK(-str -str -int,(12))
      #if !USE_LOWBITFIRST_FALSE
       }ifelse % if: /LowBitFirst
      #endif
      % Stack: len++ code
      ASSERT_STACK(-str -str -int,(13))

      dup mClear INT_LT{
        /* Speed-up: process normal literal data code in `code` */
        % Stack: len++ code
        ASSERT_STACK(-str -str -int,(15b))
        ASSERT_TRUE(dup 1 add mClear INT_LE,(code too high2)) /* /ioerror */
        ASSERT_TRUE(nentry 4095 INT_LE,(table full2))          /* /ioerror */
        prefix nentry 2 index put
        suffix nentry 1 sub  2 index put
        stack exch STACKSIZE_M1 exch put
        % Stack: len++
        ASSERT_STACK(-str -str,(15c))
        /nentry nentry 1 add def
        stack STACKSIZE_M1 1 getinterval
        % Stack: len++ stackslice
        0 % /had_eof
        ASSERT_STACK(-str -str -str -int,(20b))
        exit % exit(W1)
      }if

      dup mEOD INT_GT{
        /* Process normal data code (either literal or above-mEOD) in `code` */
        % Stack: len++ code
        ASSERT_STACK(-str -str -int,(15))
        ASSERT_TRUE(dup 1 add nentry INT_LE,(code too high)) /* /ioerror */
        ASSERT_TRUE(nentry 4095 INT_LE,(table full))          /* /ioerror */
        prefix nentry 2 index put
        % ASSERT_TRUE(0 stacklen INT_EQ,(lsp->stacklen==0))
        % Stack: len++ code
        stack exch dup STACKSIZE_M1 exch
        nentry 1 sub
        % Stack: len++ stack code STACKSIZE_M1 code nentry-1
        ASSERT_STACK(-str -str -aryb -int -int -int -int,(16))
        INT_EQ {
          % the rightmost char of this entry will be equal to the leftmost
          % side, as soon as we calculate the leftmost side
          /gcode { stack STACKSIZE_M1 2 index put /gcode {} def } def
        }if
        %{
        %  ASSERT_TRUE(1 index nentry 2 sub INT_LE,(code<lsp->nentry-1))
        %  % /gcode { } def
        %}ifelse
        -1 0
        % Stack: len++ -{...} stack code STACKSIZE-1|STACKSIZE-2 -1 0
        {
          % 1 index (code=) print ===
          % Stack: len -{...} stack code putidx
          ASSERT_STACK(-str -str -aryb -int -int,(17))
          exch dup prefix exch get 2 copy
          % Stack: len -{...} stack putidx code prefix[code] code prefix[code]
          INT_EQ{pop exit}if % exit from inner for
          % Stack: len -{...} stack putidx code prefix[code]
          4 copy pop  suffix exch get
          % Stack: len -{...} stack putidx code prefix[code] stack putidx suffix[code]
          put
          exch pop
          exch pop
          % Stack: len -{...} stack prefix[code]
        }for
        % Stack: len stack unused_putidx code
        ASSERT_STACK(-str -str -aryb -int -int,(18))
        dup suffix exch get
        % dup (sufcode=) print ===
        gcode
        suffix nentry 1 sub  2 index put pop
        % Stack: len stack unused_putidx suffix[code]
        3 copy put pop
        % Stack: len stack unused_putidx
        dup STACKSIZE exch sub
        % Stack: len stack putidx STACKSIZE-putidx
        ASSERT_STACK(-str -str -aryb -int -int,(19))
        getinterval
        ASSERT_TRUE(1 index length 0 INT_NE,(len!=0))
        /nentry nentry 1 add def
        % Stack: len++ stackslice
        0 % /had_eof
        ASSERT_STACK(-str -str -str -int,(20))
        exit % exit(W1)
      }if

      dup mEOD INT_EQ{
        % Stack: len++ code==mEOD
        pop 0 1
        % Stack: len++ garbage had_eof*
        ASSERT_STACK(-str -str -int -int,(14))
        exit % exit(W1)
      }if

      ASSERT_TRUE(dup mClear INT_EQ,(code==mClear))
      pop Fclear
      % Stack: len++
      ASSERT_STACK(-str -str,(21))
    }loop % /W1:WHILE(1)
    % Stack: len++ stackslice|garbage had_eof*
    ASSERT_TRUE(TYPE_STACK(-str -str -str -int) TYPE_STACK(-str -str -int -int -bool) BOOL_BIN(or,(ora4)),(stack leaving W2))
  } loop % /W2:WHILE(1)
  % Stack: len++
  % Stack: reto rets(buffer-not-read)
  ASSERT_STACK(-str -str,(22))
  length 1 index length exch sub
  % Stack: reto reto.length-rets.length
  0 exch getinterval
  % Stack: reto.pre(return-value)
} BIND_DEF % Flzwdecode_do

#if USE_PIN
%/Fmain {
%} BIND_DEF
} % close the function defs section
%</Defs>

%<Data>
%%BeginData:
exec
`S
%%EndData
end restore showpage
%%Trailer
%%EOF
%</Data>
#else

#if !USE_CURRENTFILE
% --- Main

%** - Fmain -
/Fmain {
  /mys 8192 string def
  Flzwdecode_init
  { mys Flzwdecode_do
    % Stack: mys.pre
    dup length 0 INT_EQ{exit}if
    STDOUT exch writestring
  } loop
  had_eof 1 INT_EQ {
    { STDIN read {pop}{exit}ifelse }loop
  }if
} BIND_DEF
Fmain
#endif

end % LZWDict
#endif

%%EOF