Usenet 1993 July/InfoMagic USENET CD-ROM July 1993.ISO/sources/misc/volume19/pclcomp/part02

Internet Message Format | 1991-05-02 | 55.6 KB

From: [e-mail] (Tony Parkhurst)
Newsgroups: comp.sources.misc
Subject: v19i014:  pclcomp - HP-PCL graphics compression filter for printers., Part02/02
Message-ID: <[e-mail]>
Date: 2 May 91 17:24:54 GMT
Approved: [e-mail]
X-Checksum-Snefru: dac0950d 1ef5dd6c 23039c04 276d9bb2

Submitted-by: Tony Parkhurst <[e-mail]>
Posting-number: Volume 19, Issue 14
Archive-name: pclcomp/part02

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then feed it
# into a shell via "sh file" or similar.  To overwrite existing files,
# type "sh file -c".
# The tool that generated this appeared in the comp.sources.unix newsgroup;
# send mail to [e-mail] if you want that tool.
# Contents:  pclcomp.c
# Wrapped by kent@sparky on Thu May  2 12:17:56 1991
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
echo If this archive is complete, you will see the following message:
echo '          "shar: End of archive 2 (of 2)."'
if test -f 'pclcomp.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'pclcomp.c'\"
else
  echo shar: Extracting \"'pclcomp.c'\" \(52617 characters\)
  sed "s/^X//" >'pclcomp.c' <<'END_OF_FILE'
X/*
X**  Pclcomp -- PCL compression filter.
X**
X**  If you have any problems or errors to report, please send them to me:
X**
X**  Tony Parkhurst
X**
X**  Email address:  [e-mail]    -or-   hp-sdd!tony
X**
X**  Please send a copy of the graphic file that is a problem, and the version
X**  of pclcomp you are using.
X**
X**  All suggestions and requests are welcome.
X*/
X
X/*
X ***************************************************************************
X *
X * $Source: /disc/44/cgtriton/tony/filters/pclcomp/RCS/pclcomp.c,v $
X * $Date: 91/04/30 09:41:24 $
X * $Revision: 1.28 $
X *
X * Description:    Compresses pcl graphics files.
X *
X * Author:       Tony Parkhurst
X * Created:      890427
X * Language:     C
X *
X * (c) Copyright 1989, Hewlett-Packard Company, all rights reserved.
X *
X ***************************************************************************
X */
X
X
X/*
X ***************************************************************************
X *
X * $Log:    pclcomp.c,v $
X * Revision 1.28  91/04/30  09:41:24  09:41:24  tony (Tony Parkhurst)
X * Now puts stdin and stdout in binary mode for MSDOS.
X *     Changes courtesy of Mike Slomin.
X * Changed usage message a bit.
X *
X * Revision 1.27  91/04/23  15:48:05  15:48:05  tony (Tony Parkhurst)
X * Added handling of plus_sign in value fields.
X *
X * Revision 1.26  91/04/23  09:47:11  09:47:11  tony (Tony Parkhurst)
X * Pass thru unknown modes.
X *
X * Revision 1.25  91/04/18  11:09:27  11:09:27  tony (Tony Parkhurst)
X * Added parse for fractions in values (i.e. <esc>(s16.67H)
X *
X * Revision 1.24  91/04/10  14:16:30  14:16:30  tony (Tony Parkhurst)
X * strips text and control codes between <esc>*rA and <esc>*rB w/ -s option
X *
X * Revision 1.23  91/04/05  14:53:25  14:53:25  tony (Tony Parkhurst)
X * Added fixed for deskjet
X * Also added a stripping feature.
X *
X * Revision 1.22  91/04/05  08:48:53  08:48:53  tony (Tony Parkhurst)
X * Added some error checkin on output for MS-DOS users.
X *
X * Revision 1.21  91/04/04  12:53:32  12:53:32  tony (Tony Parkhurst)
X * Replaced parser.
X *    Now handles combined escape sequences.
X *    Now handles downloads.
X *    Now combines mode changes with data.
X *
X * Revision 1.20  91/04/04  08:02:12  08:02:12  tony (Tony Parkhurst)
X * Removed some test code.
X *
X * Revision 1.19  91/03/25  14:38:48  14:38:48  tony (Tony Parkhurst)
X * Changed defaults.
X *
X * Revision 1.18  91/03/25  14:31:22  14:31:22  tony (Tony Parkhurst)
X * Re-worked memory allocation stuff for funky input files.
X *
X * Revision 1.17  91/03/25  13:50:19  13:50:19  tony (Tony Parkhurst)
X * Use command line args for file w/o -i or -o.
X *
X * Revision 1.16  91/03/04  14:23:15  14:23:15  tony (Tony Parkhurst)
X * Fixed to allow ONLY mode 3 if the user really wants it.
X *
X * Revision 1.15  91/03/04  14:08:23  14:08:23  tony (Tony Parkhurst)
X * Added an exit(0) at the end of main.
X * fixed up some zerostrip stuff.
X * made mode 3 the highest priority mode.
X *
X * Revision 1.14  91/02/20  13:57:27  13:57:27  tony (Tony Parkhurst)
X * Changed priority a bit.
X * Added some zerostripping for mode 2.
X *
X * Revision 1.13  91/02/06  15:31:00  15:31:00  tony (Tony Parkhurst)
X * oops.
X *
X * Revision 1.12  91/02/06  14:41:28  14:41:28  tony (Tony Parkhurst)
X * fixed usage message
X *
X * Revision 1.11  91/02/06  14:38:10  14:38:10  tony (Tony Parkhurst)
X * Added file input and output for MS-DOS.
X *
X * Revision 1.10  91/02/05  17:49:23  17:49:23  tony (Tony Parkhurst)
X * Fixed problem with zero stripped input.
X *
X * Revision 1.9  91/02/05  16:11:39  16:11:39  tony (Tony Parkhurst)
X * Removed delay code and bitfield stuff.
X *
X * Revision 1.8  91/02/05  11:04:53  11:04:53  tony (Tony Parkhurst)
X * Added io delay stuff for triton.
X *
X * Revision 1.7  91/02/05  10:28:32  10:28:32  tony (Tony Parkhurst)
X * Fix for someone specifing ONLY mode 3.
X *
X * Revision 1.6  91/01/29  14:13:09  14:13:09  tony (Tony Parkhurst)
X * Updated some comments.
X *
X * Revision 1.5  91/01/29  13:26:24  13:26:24  tony (Tony Parkhurst)
X * Cleaned up, revamped a bit.
X *
X * Revision 1.4  89/11/09  15:59:16  15:59:16  tony (Tony Parkhurst)
X * Fix for esc * r U coming after esc * r A.
X *
X * Revision 1.3  89/10/24  11:31:12  11:31:12  tony (Tony Parkhurst)
X * Added parsing of <esc>*rC
X *
X * Revision 1.2  89/10/13  09:56:46  09:56:46  tony (Tony Parkhurst)
X * Completely revamped by Greg G.
X *
X * Revision 1.1  89/06/15  13:57:46  13:57:46  tony (Tony Parkhurst)
X * Initial revision
X *
X *
X ***************************************************************************
X */
X
Xstatic char *rcs_id="$Header: pclcomp.c,v 1.28 91/04/30 09:41:24 tony Exp $";
X
Xstatic char *rev_id="$Revision: 1.28 $";
X
Xstatic char *author="Copyright (c) 1991, Tony Parkhurst";
X
X/* This program takes a PCL graphics file and will try and
X * optimize the compression.
X */
X
X/*
X *   This program was first a filter by Dean to compress pcl graphics.
X *
X *   This program now will do optimal compression using modes 0,1,2 and 3
X *
X *   Also, this program will take compressed input.
X *
X *   Input and output formats are standard pcl.
X *
X *   Imaging files will be compressed too.
X *
X *   pclcomp does not take advantage of Y-Offset for blank areas.
X *   This is because Y-Offset creates white areas, but we don't do enough
X *   parsing to determine what value "white" has.  An application that
X *   can assume white values could make use of this sequence.
X *
X *   pclcomp does not do any of the block compression modes (4-8).
X *
X *   There are a few obvious inefficiencies that I will fix later.
X *
X *   Speaking of mode 3, there is a possible problem because each of the
X *   output row storage areas are 2* size of what mode 0 would be.  This
X *   is clearly sufficient for modes 1 and 2, but it may not be for mode
X *   3.  But I cannot think of a case in Mode 3 where this would be a problem.
X *
X *   An additional enhancement would be to compare all the planes in a
X *   multi-plane file (color) and if nothing changed, using mode 3, just
X *   output a single <esc>*b0W.
X */
X
X/*
X *   Usage:  pclcomp [-v] [-0] [-1] [-2] [-3] [-z] [-n###] < infile > outfile
X *
X *   Pclcomp will do graphics compression based on compression modes 0, 1, 2
X *   and 3.  (Mode 0 is uncompressed).  Pclcomp will accept all modes, and
X *   will attempt to optimize by selecting the best output mode for each
X *   row (or plane) of data.  By default, pclcomp will use all 4 modes, but
X *   the user may restrict which output modes to use with the -0123 options.
X *   For example, to use pclcomp for output to a PaintJet which only knows
X *   modes 0 and 1 (the XL also understands modes 2 and 3), one would use:
X *
X *      pclcomp -01 < infile > outfile
X *
X *   Note:  Mode 0 should always be allowed.  None of the other modes is
X *   guaranteed to be better than mode 0 in all cases.
X *
X *   The 'v' option tells the number of rows (planes) of data input and output
X *   in the different modes (to stderr).
X *
X *   The 'z' option is useful for PaintJet files using only modes 0 and 1, it
X *   does zero "stripping" as the PaintJet will do zero "filling".
X *   NOTE: 'z' now means do NOT zerostrip.
X *
X *   The 'n' option is to change the default number of pixels in a picture.
X *   The proper way to set the pixel width is with the source raster width
X *   sequence <esc*r#S>, but soo many applications just assume the default,
X *   which is different on different printers, so I am providing this
X *   command line option to set a new default.  One could also change the
X *   DEFAULT constant below (make sure it is a multiple of 8).  Currently
X *   it is set to 8" at 180 dpi (1440), but for 300 dpi, set it to 2400.
X *
X *   default is now 2400 (for 300dpi ala LaserJet).
X */
X
X#include <stdio.h>
X#include <string.h>
X
X#ifdef MSDOS
X#include <fcntl.h>
X#endif
X
X
X/* This flag is for code that uses bitfields for 68000 systems */
X#define BITFIELDS 0
X
X#define Get_Character() getchar()
X
X#define MIN(x,y)    ( ((x) < (y)) ? (x) : (y) )
X
X#define TRUE 1
X#define FALSE 0
X
X#define ESC    27
X
X#define DEFAULT 2400        /* default width in pixels (multiple of 8) */
X
X#define MAXMODES  4
X#define MAXPLANES 8
X#define MAXBYTES 60000        /* now mostly meaningless, just a big number */
X
Xunsigned char    *seed_row[MAXPLANES];
Xunsigned char    *new_row;
Xunsigned char    *out_row[MAXMODES];
Xunsigned int    out_size[MAXMODES];
X
Xchar    memflag = FALSE;    /* set when memory has been allocated */
X
X
Xchar    mode0=FALSE,
X    mode1=FALSE,
X    mode2=FALSE,
X    mode3=FALSE;
X
Xunsigned char    num_planes=1;
Xunsigned char    curr_plane=0;
X
Xchar    imaging = FALSE;        /* not imaging, so no lockout */
X
Xchar    verbose = FALSE;
X
Xunsigned char    inmode = 0;        /* input compression mode */
Xunsigned char    outmode = 0;        /* output compression mode */
X
Xunsigned int    rasterwidth=DEFAULT/8;    /* width of picture, in bytes */
Xunsigned int    rpix = DEFAULT;        /* width of picture, in pixels */
X
Xunsigned char    invert=FALSE;        /* invert the data (obsolete) */
X
Xunsigned char    zerostrip= TRUE;    /* strip trailing zeros */
X
Xunsigned int    inuse[4]={0,0,0,0}, outuse[4] = {0,0,0,0};
X
Xchar    widthwarning = FALSE;    /* for trucation warning */
Xchar    firstrow = TRUE;    /* to prevent mode 3 from being first */
X
X
Xstruct {            /* this will hold the data for the  */
X     unsigned char model;    /* configuring of image processing   */
X     unsigned char pix_mode;
X     unsigned char inx_bits;
X     unsigned char red;
X     unsigned char green;
X     unsigned char blue;
X     short wr;
X     short wg;
X     short wb;
X     short br;
X     short bg;
X     short bb;
X} imdata;
X
Xextern    unsigned char *malloc();
X
Xchar    *filein = NULL, *fileout = NULL;
X
X/*
X**  These variables are for the new parser.
X**  The new parser handles more sequences, and also deals with combined
X**  escape sequences better.
X*/
X
Xint    parameter;
Xint    group_char;
Xint    terminator;
Xint    old_terminator;
Xint    value;
Xint    frac;
Xint    scanf_count;
Xchar    in_sequence = FALSE;
Xchar    pass_seq;
Xchar    plus_sign;        /* for relative values */
X
X
X/* dummy buffer */
Xchar buf[BUFSIZ];
X
X/*
X**  If the printer is a DeskJet, then we must handle <esc>*rB differently
X**  Option '-d' will turn on this mode.
X*/
X
Xchar    deskjet = FALSE;
X
X
X/*
X**  Many drivers it seems put <esc>*rB<esc>*rA between each and every row
X**  of data.  This defeats compression mode 3 on a DeskJet, and also
X**  makes the PaintJet (not XL) quite slow.  This next flag "-s" on the
X**  command line, will attempt to do a reasonable job of stripping
X**  out the excess commands.
X**
X**  The in_graphics flag will be used to strip unwanted control chars from
X**  the file.
X*/
X
Xchar    strip_seq = FALSE;
Xchar    in_graphics = FALSE;
X
X
X/*
X**  Just for certain special cases, it would be nice to append an <esc>E reset
X**  to the end of the job.  Specify with "-r".
X*/
X
Xchar    reset_seq = FALSE;
X
X
Xchar    *progname;        /* to hold the program name for verbose */
X
X
X
X/*
X**
X**        Main program.
X**
X*/
X
Xmain(argc, argv)
Xint argc;
Xchar *argv[];
X{
X  int    c,j;
X  extern char *optarg;
X  extern int   optind;
X
X    progname = argv[0];
X
X#ifdef MSDOS
X    setmode(fileno(stdin), O_BINARY);    /* Place stdin and stdout in */
X    setmode(fileno(stdout), O_BINARY);    /* binary mode. (Mike Slomin)*/
X#endif
X
X    /* parse up the args here */
X
X  while ((c = getopt(argc, argv, "0123drsvzn:i:o:s")) != EOF )
X    switch(c){
X    case '0':
X            mode0++;
X            break;
X    case '1':
X            mode1++;
X            break;
X    case '2':
X            mode2++;
X            break;
X    case '3':
X            mode3++;
X            break;
X    case 'd':
X            deskjet++;
X            break;
X    case 'r':
X            reset_seq++;
X            break;
X    case 's':
X            strip_seq++;
X            break;
X    case 'v':
X            verbose++;
X            break;
X    case 'z':
X            zerostrip = FALSE;
X            break;
X    case 'n':
X            rpix = atoi(optarg);    /* new default */
X            rasterwidth = (rpix + 7) / 8;    /* round up */
X            break;
X
X    case 'i':
X            filein = optarg;
X            break;
X    case 'o':
X            fileout = optarg;
X            break;
X
X    case '?':
X    default:
X            fprintf(stderr, "Usage: %s [-0123drsvz] [-n###] [infile [outfile]]\n",
X                argv[0]);
X            exit(-1);
X    };
X
X    if ( verbose )
X    {
X        fprintf(stderr, "%s: %s\n", argv[0], rev_id);
X    }
X
X
X  if ( ! ( mode0 || mode1 || mode2 || mode3) )    /* any modes on? */
X    mode0 = mode1 = mode2 = mode3 = TRUE;    /* all  modes by default */
X
X    /*
X    **  Check to see if any file args were given on the command line.
X    **  Ones that were not preceded by a "-i" or "-o".
X    */
X
X    if ( filein == NULL && optind < argc && argv[optind] != NULL )
X        filein = argv[optind++];
X
X    if ( fileout == NULL && optind < argc && argv[optind] != NULL )
X        fileout = argv[optind++];
X
X    /*
X    **  Now open files for stdin and stdout if provided by the user.
X    */
X
X    if ( filein != NULL )        /* new input file */
X
X        if ( freopen( filein, "rb", stdin ) == NULL )
X        {
X            fprintf(stderr,"Unable to open %s for input.\n",filein);
X            exit(-42);
X        }
X
X    if ( fileout != NULL )        /* new output file */
X
X        if ( freopen( fileout, "wb", stdout ) == NULL )
X        {
X            fprintf(stderr, "Unable to open %s for output.\n",
X                fileout);
X            exit(-43);
X        }
X
X
X    /*
X    **  This is the pcl input parsing loop.
X    */
X
X    while( ( c = getchar() ) != EOF )
X    {
X
X        /*  Ignore all chars until an escape char  */
X
X        /*
X        **  If we are in graphics, toss it if strip_seq is set.
X        */
X
X        if ( c != ESC )
X        {
X            if ( !strip_seq || !in_graphics )
X                putchar(c);    /* pass it thru */
X
X            continue;    /* pop to the top of the loop */
X        }
X
X        /*
X        **  Now we have an escape sequence, get the parameter char.
X        */
X
X        parameter = getchar();
X
X        if ( parameter == EOF )        /* oops */
X        {
X            putchar ( ESC );
X            fprintf(stderr, "Warning:  File ended with <esc>.\n");
X            break;            /* unexpected end of input */
X        }
X
X        /*
X        **  Now check to see if it is a two character sequence.
X        */
X
X        if ( parameter >= '0' && parameter <= '~' )
X        {
X            putchar ( ESC );
X            putchar ( parameter );        /* pass it thru */
X
X            /*
X            **  If the second character is an E, then we
X            **  and the printer do a reset.
X            */
X
X            if ( parameter == 'E' )
X            {
X                free_mem();
X                curr_plane = 0;
X                num_planes = 1;
X                imaging = FALSE;
X                inmode = 0;
X                outmode = 0;
X                in_graphics = FALSE;
X
X                /* can't do this if user gave value with -n.
X                rasterwidth = DEFAULT/8;
X                rpix = DEFAULT;
X                */
X            }
X
X            continue;        /* return to the top */
X        }
X
X        /*
X        **  Now check to make sure that the parameter character is
X        **  within range.
X        */
X
X        if ( parameter < '!' || parameter > '/' )
X        {
X            putchar ( ESC );
X            putchar ( parameter );
X
X            fprintf(stderr, "Warning:  Invalid escape sequence.\n");
X
X            continue;
X        }
X
X        /*
X        **  We are only interested in certain parameters, so pass
X        **  the rest of the sequences.
X        */
X
X        /*
X        **  For the moment, we are only interested in '*' (graphics)
X        **  '(' and ')' (downloads).  Although we do not do anything
X        **  with downloads, we need to pass the binary data thru
X        **  untouched.
X        **  Also, '&' is handled too.
X        */
X
X        if ( parameter != '*' && parameter != '('
X            && parameter != ')' && parameter != '&' )
X        {
X            putchar ( ESC );
X            putchar ( parameter );
X            Flush_To_Term();        /* flush rest of seq. */
X            continue;
X        }
X
X
X        /*
X        **  Parameter character is in range, look for a valid group char
X        */
X
X        group_char = getchar();
X
X        if ( group_char == EOF )    /* oops, ran out of input */
X        {
X            putchar ( ESC );
X            putchar ( parameter );
X
X            fprintf(stderr, "Warning:  Incomplete escape sequence.\n");
X            break;
X        }
X
X        /*
X        **  See if in proper range.  If it isn't, it is not an error
X        **  because the group character is optional for some sequences.
X        **  For the moment, we are not interested in those sequences,
X        **  so pass them thru.
X        */
X
X        if ( group_char < '`' || group_char > '~' )
X        {
X            putchar ( ESC );
X            putchar ( parameter );
X            putchar ( group_char );
X            if ( group_char < '@' || group_char > '^' )
X                Flush_To_Term();    /* pass rest of seq. */
X            continue;
X        }
X
X        /*
X        **  Now we have a valid group character, decide if we want
X        **  to deal with this escape sequence.
X        **
X        **  Sequences we want do deal with include:
X        **
X        **    <esc>*r    ** graphics
X        **    <esc>*b    ** graphics
X        **    <esc>*v    ** graphics
X        **
X        **  Sequences we must pass thru binary data:
X        **
X        **    <esc>*c    ** pattern
X        **    <esc>*t    ** obsolete
X        **    <esc>(f    ** download char set
X        **    <esc>(s    ** download char
X        **    <esc>)s    ** download font
X        **    <esc>&a    ** logical page
X        **    <esc>&l    ** obsolete
X        **
X        */
X
X        if (  ( parameter == '*'
X            && group_char != 'r' && group_char != 'b'
X            && group_char != 'v' && group_char != 'c'
X            && group_char != 't' )
X           || ( parameter == '&'
X            && group_char != 'a' && group_char != 'l' )
X           || ( parameter == '('
X            && group_char != 'f' && group_char != 's' )
X           || ( parameter == ')' && group_char != 's' ) )
X        {
X            /*
X            **  Definately not interested in the sequence.
X            */
X
X            putchar ( ESC );
X            putchar ( parameter );
X            putchar ( group_char );
X            Flush_To_Term();
X            continue;
X        }
X
X        /*
X        **  Now set up a pass thru flag so we can ignore the entire
X        **  sequences of some of these.
X        */
X
X        if ( parameter != '*' )
X            pass_seq = TRUE;
X        else if ( group_char == 'c' || group_char == 't' )
X            pass_seq = TRUE;
X        else
X            pass_seq = FALSE;
X
X
X        /*
X        **  Now we have a sequence that we are definately interested in.
X        **
X        **  Get the value field and terminator, and loop until final
X        **  terminator is found.
X        */
X
X        do
X        {
X            /* first see if the value has a plus sign */
X
X            scanf_count = scanf(" + %d", &value );
X
X            if ( scanf_count == 1 )
X
X                plus_sign = TRUE;
X            else
X            {
X                plus_sign = FALSE;
X
X                scanf_count = scanf(" %d", &value );
X
X                if ( scanf_count == 0 )
X                    value = 0;        /* by default */
X            }
X
X            terminator = getchar();
X
X            /*
X            ** check to see if a fractional parameter was passed.
X            */
X
X            frac = 0;    /* in case no fraction */
X
X            if ( terminator == '.' )
X            {
X                /*
X                **  Need to get fractional part.
X                **
X                **  This will not work properly if the
X                **  fraction is < .1 (i.e. a leading 0 is
X                **  present).  For example, the value
X                **  14.05 for point size, which would get
X                **  rounded to 14.00 for scalable fonts,
X                **  would get passed thru as 14.5 which is
X                **  rounded to 14.5.  This is unlikely to
X                **  happen as the 14.05 case is rare, but
X                **  it is valid PCL, so I will fix this
X                **  in the future.
X                */
X
X                if ( scanf("%d", &frac) != 1 )
X                {
X                    frac = 0;    /* no frac? */
X                }
X
X                /*
X                **  Now get the real terminator.
X                */
X
X                terminator = getchar();
X            }
X
X
X            if ( terminator == EOF )    /* barf */
X            {
X                fprintf(stderr, "Warning:  Incomplete sequence at end of file.\n");
X                break;
X            }
X
X            /*
X            **  If the pass_seq flag is set, then just pass
X            **  it thru to stdout until a 'W' is found.
X            */
X
X            if ( pass_seq )
X            {
X                /*
X                **  If not in sequence, then we output esc
X                **  otherwise, output the saved terminator.
X                */
X
X                if ( !in_sequence )
X                {
X                    in_sequence = TRUE;
X                    putchar ( ESC );
X                    putchar ( parameter );
X                    putchar ( group_char );
X                } else
X                {
X                    putchar ( old_terminator );
X                }
X
X                /* now pass the value */
X
X                if ( plus_sign )
X                    putchar('+');
X
X                if ( scanf_count )    /* there was a value */
X                    printf("%0d", value);
X
X                /* need to output the fractional part */
X
X                if ( frac )
X                    printf(".%0d", frac);
X
X                /*
X                **  We save the terminator, because we may
X                **  need to change it to upper case.
X                */
X
X                old_terminator = terminator;
X
X                /* if binary data, pass it thru */
X
X                if ( terminator == 'W' )    /* aha */
X                {
X                    putchar ( terminator );
X                    in_sequence = FALSE;    /* terminates */
X                    Flush_Bytes ( value );    /* pass data */
X                }
X
X                continue;
X            }
X
X            /*
X            **  Ok, this is a sequence we want to pay attention to.
X            **
X            **  Do_Graphics returns TRUE if we need to pass seq.
X            **
X            **  Note:  Do_Graphics modifies the parser vars such
X            **         as in_sequence.  This is because it may
X            **         have to output stuff directly.
X            */
X
X            if ( Do_Graphics ( group_char, value, terminator ) )
X            {
X                /*
X                **  If not in sequence, then we output esc
X                **  otherwise, output the saved terminator.
X                */
X
X                if ( !in_sequence )
X                {
X                    in_sequence = TRUE;
X                    putchar ( ESC );
X                    putchar ( parameter );
X                    putchar ( group_char );
X                } else
X                {
X                    putchar ( old_terminator );
X                }
X
X                /* now pass the value */
X
X                if ( plus_sign )
X                    putchar('+');
X
X                if ( scanf_count )    /* there was a value */
X                    printf("%0d", value);
X
X                /* need to output the fractional part */
X
X                if ( frac )
X                    printf(".%0d", frac);
X
X                /*
X                **  We save the terminator, because we may
X                **  need to change it to upper case.
X                */
X
X                old_terminator = terminator;
X            }
X
X        } while ( terminator >= '`' && terminator <= '~' );
X
X        /*
X        ** The oppsite test (above) may be more appropriate.  That is,
X        ** !(terminator >= '@' && terminator <= '^').
X        */
X
X        /*
X        **  If we were in a sequence, then we must terminate it.
X        **  If it was lower case, then it must be uppered.
X        */
X
X        if ( in_sequence )
X        {
X            putchar ( terminator & 0xdf );        /* a ==> A */
X            in_sequence = FALSE;
X        }
X    }
X
X
X    /*
X    **  If the user wants a reset, give him one.
X    */
X
X    if ( reset_seq )
X    {
X        putchar ( ESC );
X        putchar ( 'E' );
X    }
X
X
X    /*
X    **  Finished up, so print stats and close output file.
X    */
X
X    fclose(stdout);
X
X
X    if ( verbose )
X    {
X        for(j = 0; j < 4; j++)
X            fprintf(stderr,"Rows in mode %1d: %d\n", j, inuse[j]);
X        for(j = 0; j < 4; j++)
X            fprintf(stderr,"Rows out mode %1d: %d\n", j, outuse[j]);
X    }
X
X    exit(0);
X}
X
X
X/*
X**  Do_Graphics() takes the graphics escape sequence and performs the
X**  necessary functions.
X**  TRUE is returned if the escape sequence needs to be passed to the output.
X*/
X
Xint    Do_Graphics( group, num, terminator )
Xint    group, num, terminator;
X{
X
X    /*  first look at vW  */
X
X    if ( group == 'v' )
X
X        if ( terminator != 'W' )
X
X            return ( TRUE );    /* pass it thru */
X        else
X        {
X            if ( !in_sequence )
X            {
X                putchar ( ESC );
X                putchar ( parameter );
X                putchar ( group );
X            } else
X                putchar ( old_terminator );
X
X            in_sequence = FALSE;        /* terminating */
X
X            printf("%0d", num);
X            putchar ( terminator );
X
X            free_mem();    /* reset memory */
X
X            imaging++;
X
X            fread(&imdata, MIN(num, 18), 1, stdin);
X            fwrite(&imdata, MIN(num, 18), 1, stdout);
X
X            num -= MIN(num, 18);
X
X            /* copy rest of unknown data */
X
X            if ( num > 0 )
X                Flush_Bytes(num);
X
X
X            switch(imdata.pix_mode){
X                case 0x00:
X                    rasterwidth = (rpix + 7)/8;
X                    num_planes = imdata.inx_bits;
X                    break;
X                case 0x01:
X                    rasterwidth = rpix*imdata.inx_bits/8;
X                    break;
X                case 0x02:
X                    rasterwidth = (rpix + 7)/8;
X                    num_planes =imdata.red + imdata.green +
X                                imdata.blue;
X                    break;
X                case 0x03:
X                    rasterwidth = (imdata.red +
X                                   imdata.green +
X                                   imdata.blue)*rpix/8;
X                    break;
X            }
X
X            return ( FALSE );
X        }
X
X    /*
X    **  Now deal with <esc>*r stuff
X    */
X
X    if ( group == 'r' )
X    {
X        switch ( terminator )
X        {
X            case 'A':
X            case 'a':
X
X                /* in graphics mode, may do stripping */
X                in_graphics = TRUE;
X
X                /* if user wants to strip redundant seq */
X                if ( strip_seq && memflag )
X                    return( FALSE );
X
X                curr_plane=0;
X                zero_seeds();    /* may allocate mem */
X                break;
X
X            case 'C':
X            case 'c':
X
X                /* not in graphics disable code strip */
X
X                in_graphics = FALSE;
X
X                if ( strip_seq )
X                    return( FALSE );
X
X                inmode = 0;
X                outmode = 0;
X
X                free_mem();
X                curr_plane=0;
X                break;
X
X            case 'B':
X            case 'b':
X
X                /* not in graphics disable code strip */
X
X                in_graphics = FALSE;
X
X                if ( strip_seq )
X                    return( FALSE );
X
X                if ( deskjet )    /* B resets modes on DJ */
X                {
X                    inmode = 0;
X                    outmode = 0;
X                }
X                free_mem();
X                curr_plane=0;
X                break;
X
X            case 'S':
X            case 's':
X
X                /* free mem in case widths changed */
X                free_mem();
X
X                rpix = num;
X
X                if (imaging){
X                    switch(imdata.pix_mode)
X                    {
X                        case 0x00:
X                            rasterwidth=(rpix+7)/8;
X                            break;
X                        case 0x01:
X                            rasterwidth =
X                             rpix*imdata.inx_bits/8;
X                            break;
X                        case 0x02:
X                            rasterwidth=(rpix+7)/8;
X                            break;
X                        case 0x03:
X                            rasterwidth =
X                              (imdata.red
X                              + imdata.green
X                              + imdata.blue)*rpix/8;
X                            break;
X                    }
X                } else
X                    rasterwidth = (num + 7) / 8;
X                break;
X
X            case 'T':
X            case 't':
X                break;
X
X            case 'U':
X            case 'u':
X                curr_plane=0;
X                free_mem();    /* if ESC*rA came first */
X                num_planes = num;
X                imaging = FALSE;    /* goes off */
X                break;
X
X            default:
X                break;
X        }
X
X        return ( TRUE );        /* pass sequence on */
X
X    }    /* group r */
X
X    /*
X    **  Last and final group 'b'.  All the graphics data comes thru here.
X    */
X
X
X    switch ( terminator )
X    {
X           case 'm':
X           case 'M':
X            inmode = num;
X            return ( FALSE );    /* we do NOT pass this */
X            break;
X
X           /*
X           **  <esc>*b#X is obsolete, don't bother with it.
X           **  If I did do something, then I would zero part of the
X           **  seed rows.
X           */
X
X           case 'x':
X           case 'X':
X            break;
X
X           case 'y':
X           case 'Y':
X            /* zero only if allocated */
X            if ( memflag )
X                zero_seeds();
X            break;
X
X           case 'W':
X            if(!memflag)
X                zero_seeds();        /* get memory */
X
X            /* fire up sequence */
X
X            if ( !in_sequence )
X            {
X                putchar ( ESC );
X                putchar ( parameter );
X                putchar ( group );
X            } else
X                putchar ( old_terminator );
X
X            in_sequence = FALSE;        /* terminating */
X
X            if(curr_plane < num_planes)
X            {
X
X                Process(num, 'W');
X
X                if ( curr_plane + 1 < num_planes )
X                {
X                    /* now we have a problem */
X                    zero_upper(curr_plane + 1);
X                }
X            } else
X                Process_extra(num,'W');
X
X            curr_plane=0;
X
X            return ( FALSE );
X
X            break;
X
X           case 'V':
X            if(!memflag)
X                zero_seeds();        /* get memory */
X
X            /*
X            **  If curr_plane is the last plane, this should
X            **  be a 'W', not a 'V'.  I could change it,
X            **  then I would fix Process_extra() to not output
X            **  anything as the 'W' was already sent.
X            */
X
X            if( curr_plane < num_planes )
X            {
X                /* fire up sequence */
X
X                if ( !in_sequence )
X                {
X                    putchar ( ESC );
X                    putchar ( parameter );
X                    putchar ( group );
X                } else
X                    putchar ( old_terminator );
X
X                in_sequence = FALSE;    /* terminating */
X
X
X                Process(num, 'V');
X                curr_plane++;
X            } else
X                Process_extra(num,'V');
X
X            return ( FALSE );
X
X            break;
X
X        default:
X            break;
X    }
X
X    return ( TRUE );        /* pass sequence */
X}
X
X
X
X/*
X**  Flush_To_Term() simply passes thru input until a valid terminator
X**  character is found.  This is for unwanted escape sequences.
X*/
X
XFlush_To_Term()
X{
X    int    c;
X
X    do
X    {
X        c = getchar();
X
X        if ( c == EOF )            /* this is a problem */
X            return;
X
X        putchar ( c );
X
X    } while ( c < '@' || c > '^' );
X}
X
X
X/*
X**  Flush_Bytes() simply transfers so many bytes directly from input to output.
X**  This is used to pass thru binary data that we are not interested in so that
X**  it will not confuse the parser.  I.e. downloads.
X*/
X
XFlush_Bytes( num )
Xunsigned int    num;
X{
X    int    bnum;
X
X    while ( num > 0 )
X    {
X        bnum = MIN ( BUFSIZ, num );
X
X        fread( buf, 1, bnum, stdin );
X
X        if ( fwrite( buf, 1, bnum, stdout ) < bnum )
X
X            /* check for error and exit */
X
X            if ( ferror(stdout) )
X            {
X                perror("Output error");
X                exit(-2);
X            }
X
X        num -= bnum;
X    }
X}
X
X
X
X
X/*----------------------------------------*/
X
X/*
X**    Zero_seeds() will allocate and initialize memory.
X**    If memory has already been allocated, then it will just initialize it.
X*/
X
X
Xzero_seeds()
X{
X    int r;
X
X    /* first allocate and init seed_rows for number of planes. */
X
X    for ( r = 0; r < num_planes ; r++)
X    {
X        if(!memflag)
X        {
X            seed_row[r] = (unsigned char *) malloc(rasterwidth);
X
X            if ( seed_row[r] == NULL )
X            {
X                fprintf(stderr, "Out of memory.\n");
X                exit(-3);
X            }
X        }
X
X        /* zero seeds for mode 3 */
X
X        memset(seed_row[r], 0, rasterwidth);
X    }
X
X
X    if(!memflag)
X    {
X        new_row = (unsigned char *) malloc(rasterwidth);
X
X        if ( new_row == NULL )
X        {
X            fprintf(stderr, "Out of memory.\n");
X            exit(-3);
X        }
X
X        for(r=0; r<MAXMODES; r++)
X        {
X            /* 2 * width is needed for modes 1, 2 and 3 */
X
X            out_row[r] = (unsigned char *) malloc(2 * rasterwidth);
X
X            if ( out_row[r] == NULL )
X            {
X                fprintf(stderr, "Out of memory.\n");
X                exit(-3);
X            }
X        }
X
X    }
X
X    memset(new_row, 0, rasterwidth);
X
X    memflag = TRUE;            /* memory is in place */
X}
X
X
X/* this routine if for incomplete transfers of data */
X
Xzero_upper(plane)
Xint    plane;
X{
X    int i;
X
X    /* assume memory already present */
X
X    for ( i = plane; i < num_planes; i++)
X        memset(seed_row[i], 0, rasterwidth);
X}
X
X
XProcess(inbytes, terminator)
Xint inbytes, terminator;
X{
X
X    int insize;
X    int minmode = 0;
X
X    inuse[inmode]++;
X
X    switch ( inmode ) {
X
X    case 0:
X        if ( !widthwarning && inbytes > rasterwidth )
X        {
X            /* This is likely to result in data truncation. */
X            widthwarning = TRUE;
X            fprintf(stderr,"Warning: Input pixel width exceeds expected width.\n");
X        }
X
X        insize = Mode_0_Graphics(inbytes,rasterwidth,new_row,invert);
X        break;
X    case 1:
X        insize = Mode_1_Graphics(inbytes,rasterwidth,new_row,invert);
X        break;
X    case 2:
X        insize = Mode_2_Graphics(inbytes,rasterwidth,new_row,invert);
X        break;
X    case 3:
X        memcpy(new_row, seed_row[curr_plane], rasterwidth);
X        insize = Mode_3_Graphics(inbytes,rasterwidth,new_row,invert);
X        break;
X
X    default:        /* unknown mode? */
X
X        /*  Don't know what to do about seed rows, pass stuff thru */
X
X        fprintf(stderr, "%s: Unsupported compression mode %d.\n",
X            progname, inmode );
X
X        ChangeMode(inmode);    /* go to that mode */
X
X        /* <esc>*b has already been output */
X
X        printf("%1d%c", inbytes, terminator);
X
X        Flush_Bytes( inbytes );
X
X        firstrow = TRUE;        /* pop it out of mode 3 */
X
X        /*  Go ahead and clear the seed rows if present  */
X        if ( memflag )
X            zero_seeds();
X
X        return;
X
X    }
X
X
X    /*
X    **
X    */
X
X    if ( mode0 )
X        /* actually, this is redundant since new_row is mode 0 */
X        out_size[0] = Output_0( new_row, out_row[0], rasterwidth );
X    else
X        out_size[0] = MAXBYTES+1;
X
X    if ( mode1 )
X        out_size[1] = Output_1( new_row, out_row[1], rasterwidth );
X    else
X        out_size[1] = MAXBYTES+1;
X
X    if ( mode2 )
X        out_size[2] = Output_2( new_row, out_row[2], rasterwidth );
X    else
X        out_size[2] = MAXBYTES+1;
X
X    if ( mode3 )
X        out_size[3] = Output_3( seed_row[curr_plane], new_row, out_row[3], rasterwidth );
X    else
X        out_size[3] = MAXBYTES+1;
X
X
X    /*
X    **  Now determine which mode will give the best output.  Note that it
X    **  takes 5 bytes to change modes, so we penalize all modes that are
X    **  not the current output by 5 bytes.  This is to discourage changing
X    **  unless the benifit is worth it.  The exception to this rule is
X    **  mode 3.  We want to encourage going to mode 3 because of the seed
X    **  row behaviour.  That is, if we have a simple picture that does
X    **  not change much, and say each of the sizes for modes 1 and 2 always
X    **  comes out to 4 bytes of data, then if we add 5 to mode 3 each time,
X    **  it would never get selected.  But, we remove the penalty, and if
X    **  mode 3 is selected (0 bytes of data needed for mode 3), then each
X    **  succesive row only needs 0 bytes of data.  For a 300 dpi A size
X    **  picture with 3 data planes, this could be a savings of 37k bytes.
X    */
X
X    /*
X    **  With the new parser, the output to change modes is now only
X    **  2 bytes, since it gets combined with the *b#W sequence.
X    **  So, I decided to ignore the switching penalty.
X    */
X
X    /*
X    **  Due to a possible bug in PaintJet XL, don't allow mode 3 to be
X    **  selected for the first row of output.  But do allow it if the
X    **  user has no other mode selected.
X    */
X
X    if ( firstrow && (mode0 || mode1 || mode2) )
X    {
X        out_size[3] = MAXBYTES+1;    /* disable mode 3 for now */
X
X        if ( terminator == 'W' )    /* last plane? */
X            firstrow = FALSE;    /* no longer first row */
X    }
X
X
X    minmode = 3;
X
X    if ( out_size[2] < out_size[minmode] )
X        minmode = 2;
X
X    if ( out_size[1] < out_size[minmode] )
X        minmode = 1;
X
X    if ( out_size[0] < out_size[minmode] )
X        minmode = 0;
X
X
X                    /* I may remove this sometime */
X    if ( minmode != outmode )
X        if ( out_size[minmode] == out_size[outmode] )
X            minmode = outmode;
X
X
X    outuse[minmode]++;
X
X    if ( outmode != minmode )
X        ChangeMode( minmode );
X
X    /* <esc>*b has already been output */
X
X    printf("%1d%c", out_size[minmode], terminator);
X
X    if ( fwrite( out_row[minmode], 1, out_size[minmode], stdout) <
X                            out_size[minmode] )
X
X        /* check for error and exit */
X
X        if ( ferror(stdout) )
X        {
X            perror("Output error");
X            exit(-2);
X        }
X
X
X    memcpy(seed_row[curr_plane], new_row, rasterwidth);
X
X}
X
XProcess_extra(bytes, terminator)
Xint bytes;
Xchar terminator;
X{
X    int  i;
X
X    /* toss any excess data */
X
X    for(i = 0; i < bytes; i++)
X       getchar();
X
X    /* last plane? force move down to next row */
X
X    if(terminator == 'W')
X    {
X        /* <esc>*b has already been output */
X        printf("0W");
X
X        firstrow = FALSE;        /* not on first row anymore */
X
X    }
X
X}
X
XChangeMode(newmode)
Xint newmode;
X{
X    /*
X    **  <esc>*b have already been output.
X    **  terminator is 'm' instead of 'M' since will be followed by 'W'
X    */
X    printf("%1dm", newmode);
X    outmode = newmode;
X}
X
X
X/* these decoders came from graphics.c in the gp parser */
X
X
X/* $PAGE$ */
X/*-----------------------------------------------------------------------*\
X |                                                                       |
X |  Function Name: Mode_0_Graphics                                       |
X |                                                                       |
X |  Description:                                                         |
X |                                                                       |
X |  This is the routine that handles a Mode 0 graphics block transfer    |
X |  to the Formatter Module.                                             |
X |                                                                       |
X\*-----------------------------------------------------------------------*/
X
X/* FUNCTION */
X
XMode_0_Graphics(input_bytes, output_bytes, address, invert)
X
Xunsigned int
X   input_bytes,                 /* Count of bytes to be read. */
X   output_bytes;                /* Count of bytes to be stored. */
X
Xunsigned char
X   *address;                    /* Pointer to where to store bytes. */
X
Xunsigned char            /* Boolean to request data inversion */
X    invert;
X
X{
X   /* LOCAL VARIABLES */
X
X   unsigned char
X      *store_ptr;               /* Pointer to where to store the byte. */
X
X   unsigned int
X      read_bytes,               /* Local copy of input_bytes. */
X      write_bytes;              /* Local copy of output_bytes. */
X
X   /* CODE */
X
X   /* Initialize the local variables. */
X
X   read_bytes = input_bytes;
X   write_bytes = output_bytes;
X   store_ptr = address;
X
X
X   /* transfer the lesser of available bytes or available room */
X
X   if (invert)
X     Inv_Transfer_Block( MIN(write_bytes,read_bytes), store_ptr);
X   else
X     Transfer_Block( MIN(write_bytes,read_bytes), store_ptr);
X
X   /* now zero fill or throw excess data away */
X
X   if ( read_bytes > write_bytes )
X      Discard_Block(read_bytes - write_bytes);        /* throw excess */
X   else {
X      store_ptr += read_bytes;                /* adjust pointer */
X      write_bytes -= read_bytes;            /* zero fill count */
X
X      memset(store_ptr, 0, write_bytes);
X   }
X
X   return ( input_bytes );
X}
X
X/* $PAGE$ */
X/*-----------------------------------------------------------------------*\
X |                                                                       |
X |  Function Name: Mode_1_Graphics                                       |
X |                                                                       |
X |  Description:                                                         |
X |                                                                       |
X |  This is the routine that handles a Mode 1 graphics block transfer    |
X |  to the Formatter Module.  Mode 1 graphics is a compacted mode.       |
X |  The data in Mode 1 is in pairs.  The first byte is a replicate       |
X |  count and the second byte is the data.  The data byte is stored      |
X |  then replicated the replicate count.  Therefore a replicate count    |
X |  of 0 means the data byte is stored once.  The input byte count       |
X |  must be an even amount for the data to be in byte pairs.             |
X |                                                                       |
X\*-----------------------------------------------------------------------*/
X
X/* FUNCTION */
X
XMode_1_Graphics(input_bytes, output_bytes, address, invert)
X
Xunsigned int
X   input_bytes,                 /* Count of bytes to be read. */
X   output_bytes;                /* Count of bytes to be stored. */
X
Xunsigned char
X   *address;                    /* Pointer to where to store bytes. */
X
Xunsigned char            /* Boolean to request data inversion */
X    invert;
X
X{
X   /* LOCAL VARIABLES */
X
X   unsigned char
X      *store_ptr,               /* Pointer to where to store the byte. */
X      input_char;               /* Byte to be replicated. */
X
X   unsigned int
X      read_bytes,               /* Local copy of input_bytes. */
X      write_bytes;              /* Local copy of output_bytes. */
X
X   int
X      replicate_count;          /* Number of times to replicate data. */
X
X   /* CODE */
X
X   /* Initialize the local variables. */
X
X   read_bytes = input_bytes;
X   write_bytes = output_bytes;
X   store_ptr = address;
X
X   /* Check for an even input count. */
X
X   if ((read_bytes % 2) == 0)
X   {
X      /* Even so input data is in pairs as required. So store the data. */
X
X      while ((read_bytes != 0) && (write_bytes != 0))
X      {
X         /* First get the replicate count and the byte to store. */
X
X         replicate_count = (unsigned char) Get_Character();
X         input_char = (invert ? ~Get_Character() : Get_Character());
X         read_bytes -= 2;
X
X         /* Since write_bytes was 0 there is room to store the byte. */
X
X         *store_ptr++ = input_char;
X         write_bytes--;
X
X         /* Now make sure there is room for the replicated data. */
X
X         if (replicate_count > write_bytes)
X         {
X            /* Too much so limit to the room available. */
X
X            replicate_count = write_bytes;
X         }
X
X         /* Update the amount to be written. */
X
X         write_bytes -= replicate_count;
X
X         /* Then replicate it. */
X
X         while (replicate_count != 0)
X         {
X            /* Store the byte the decrement the count. */
X
X            *store_ptr++ = input_char;
X
X            replicate_count--;
X         }
X      }
X
X   }
X   /* Discard any left over input. */
X    /* OR */
X   /* Discard all of the input data as odd byte count. */
X
X   Discard_Block(read_bytes);
X
X   read_bytes = store_ptr - address;  /* how much was done? */
X
X   /* zero fill if needed */
X   memset(store_ptr, 0, write_bytes);
X
X   return(read_bytes);
X}
X
X/* $PAGE$ */
X/*-----------------------------------------------------------------------*\
X |                                                                       |
X |  Function Name: Mode_2_Graphics                                       |
X |                                                                       |
X |  Description:                                                         |
X |                                                                       |
X |  This is the routine that handles a Mode 2 graphics block transfer    |
X |  to the Formatter Module.  Mode 2 graphics is a compacted mode.       |
X |  The data in Mode 2 is of one of two types.  The first type is a      |
X |  class type and the second type is a data type.  The class type is    |
X |  a single byte which is a combination of replicate count and a sub    |
X |  mode.  There are two sub modes within mode 2, sub mode 0 and sub     |
X |  mode 1.  These sub modes are flagged by the MSB of the class type    |
X |  byte.  If the MSB = 0 then the replicate count is the value of the   |
X |  class type byte.  In sub mode 0 the replicate count ranges from 1    |
X |  to 127.  In sub mode 0 the next byte and then the replicate count    |
X |  of bytes are of the data type and stored.  If the MSB = 1 then the   |
X |  sub mode is 1 and the replicate count is the negative value of the   |
X |  class type.  In sub mode 1 the replicate count is stored in 2s       |
X |  compliment form and ranges from -1 to -127.  In sub mode 1 the       |
X |  next byte is of the data type and is stored.  That data byte is      |
X |  then replicated and stored the replicate count.  If the class type   |
X |  byte is 128 then there is no data type byte.                         |
X |                                                                       |
X\*-----------------------------------------------------------------------*/
X
X/* FUNCTION */
X
XMode_2_Graphics(input_bytes, output_bytes, address, invert)
X
Xunsigned int
X   input_bytes,                 /* Count of bytes to be read. */
X   output_bytes;                /* Count of bytes to be stored. */
X
Xunsigned char
X   *address;                    /* Pointer to where to store bytes. */
X
Xunsigned char            /* Boolean to request data inversion */
X    invert;
X
X{
X   /* LOCAL VARIABLES */
X
X   unsigned char
X      *store_ptr,               /* Pointer to where to store the byte. */
X      input_char,               /* Byte to be replicated. */
X      sub_mode;                 /* Flag if sub mode is 0 or 1. */
X
X   unsigned int
X      read_bytes,               /* Local copy of input_bytes. */
X      write_bytes;              /* Local copy of output_bytes. */
X
X   int
X      replicate_count;          /* Number of times to replicate data. */
X
X   /* CODE */
X
X   /* Initialize the local variables. */
X
X   read_bytes = input_bytes;
X   write_bytes = output_bytes;
X   store_ptr = address;
X
X   while ((read_bytes > 1) && (write_bytes != 0))
X   {
X      /* First get the class type byte and the first data type byte. */
X
X      replicate_count = Get_Character();
X
X      /* First check that this not an ignore class type. */
X
X      if (replicate_count != 128)
X      {
X         /* Not ignore so get the data class byte. */
X
X         input_char = (invert ? ~Get_Character() : Get_Character());
X         read_bytes -= 2;
X
X        /* Since write_bytes wasn't 0 there is room to store the byte. */
X
X         *store_ptr++ = input_char;
X         write_bytes--;
X
X         /* Determine the sub mode. */
X
X         if (replicate_count > 128)
X         {
X            /* Sub mode 1. */
X
X            sub_mode = 1;
X            /* replicate count was unsigned char */
X            replicate_count = 256 - replicate_count;
X         }
X         else
X         {
X            /* Sub mode 0. */
X
X            sub_mode = 0;
X
X            /* See if there is enoungh input left for the data byte count. */
X
X            if (replicate_count > read_bytes)
X            {
X               /* Too many data bytes so limit to the input left. */
X
X               replicate_count = read_bytes;
X            }
X         }
X
X         /* Now make sure there is room for the replicated data. */
X
X         if (replicate_count > write_bytes)
X         {
X            /* Too much so limit to the room available. */
X
X            replicate_count = write_bytes;
X         }
X
X         /* Update the amount to be written. */
X
X         write_bytes -= replicate_count;
X
X         /* Then replicate it. */
X
X         if (sub_mode == 0)
X         {
X            /* Sub mode 0 so get the replicate count of data bytes. */
X
X            if (invert)
X              Inv_Transfer_Block(replicate_count, store_ptr);
X            else
X              Transfer_Block(replicate_count, store_ptr);
X
X            read_bytes -= replicate_count;
X
X            /* Find the last byte stored. */
X
X            store_ptr += replicate_count;
X         }
X         else
X         {
X            /* Sub mode 1 so just duplicate the original byte. */
X
X            while (replicate_count != 0)
X            {
X               /* Store the byte the decrement the count. */
X
X               *store_ptr++ = input_char;
X
X               replicate_count--;
X            }
X         }
X      }
X      else
X      {
X         /* Ignore class so don't get the data class byte. */
X
X         read_bytes--;
X      }
X   }
X
X   /* Now discard any left over input. */
X
X   Discard_Block(read_bytes);
X
X   read_bytes = store_ptr - address;
X
X   /* zero fill if needed */
X   memset(store_ptr, 0, write_bytes);
X
X
X   return(read_bytes);
X}
X
X/* $PAGE$ */
X/*-----------------------------------------------------------------------*\
X |                                                                       |
X |  Function Name: Mode_3_Graphics                                       |
X |                                                                       |
X |  Description:                                                         |
X |                                                                       |
X |  This is the routine that handles a Mode 3 graphics block transfer    |
X |  to the Formatter Module.  Mode 3 graphics is a compacted mode.       |
X |  Mode 3 data is a difference from one row to the next.  In order to   |
X |  work, each row must be saved to be a seed for the next.  This        |
X |  mode is used in conjuction with other compaction modes when the      |
X |  data remains fairly constant between pairs of rows.                  |
X |  The data is in the form:                                             |
X |  <command byte>[<optional offset bytes>]<1 to 8 replacement bytes>    |
X |  The command byte is in the form:                                     |
X |    Bits 5-7: Number of bytes to replace (1 - 8)                       |
X |    Bits 0-4: Relative offset from last byte.                          |
X |       (If the offset is 31, then add the following bytes for offset   |
X |       until an offset byte of less then 255 (but inclusive)           |
X |                                                                       |
X\*-----------------------------------------------------------------------*/
X
X/* FUNCTION */
X
XMode_3_Graphics(input_bytes, output_bytes, address, invert)
X
Xunsigned int
X   input_bytes,                 /* Count of bytes to be read. */
X   output_bytes;                /* Count of bytes to be stored. */
X
Xunsigned char
X   *address;                    /* Pointer to where to store bytes. */
X
Xunsigned char            /* Boolean to request data inversion */
X    invert;
X
X{
X   /* LOCAL VARIABLES */
X
X   unsigned char
X      *store_ptr,               /* Pointer to where to store the byte. */
X      input_char;               /* Byte to be changed. */
X
X   unsigned int
X      read_bytes,               /* Local copy of input_bytes. */
X      write_bytes;              /* Local copy of output_bytes. */
X
X   unsigned int
X      replace,            /* number of bytes to replace, 1-8 */
X      offset;            /* relative offset */
X
X#if BITFIELDS
X   union comtype {
X      unsigned char comchar;    /* command byte as char */
X      struct btype {
X     unsigned repcount:3;    /* replace count 1-8 */
X     unsigned roff:5;    /* relative offset 0-30 */
X      } bitf;
X   } command;
X#else
X    unsigned char    command;
X#endif
X
X   /* CODE */
X
X   /* Initialize the local variables. */
X
X   read_bytes = input_bytes;
X   write_bytes = output_bytes;
X   store_ptr = address;
X
X/* read_bytes has to be at least 2 to be valid */
X
X   while ( read_bytes > 1 && write_bytes > 0 ){
X
X      /* start by getting the command byte */
X
X      read_bytes--;
X
X#if BITFIELDS
X      command.comchar = Get_Character();
X
X      replace = command.bitf.repcount + 1;    /* replace count 1-8 */
X
X      offset = command.bitf.roff;        /* offset 0-30, 31= extend */
X#else
X    command = Get_Character();
X    replace = (command >> 5) + 1;
X    offset = command & 0x1f;
X#endif
X
X      store_ptr += offset;
X      write_bytes -= offset;
X
X      if ( offset == 31 )        /* get more offsets */
X     do{
X
X        offset = Get_Character();
X
X        read_bytes--;
X            if ( read_bytes == 0 )        /* premature finish? */
X           return;                /* no zero fill wih 3 */
X
X        store_ptr += offset;
X            write_bytes -= offset;
X
X     } while (offset == 255);    /* 255 = keep going */
X
X      /* now do the byte replacement */
X
X      while ( replace-- && write_bytes > 0 && read_bytes > 0 ){
X
X     *store_ptr++ = (invert ? ~Get_Character() : Get_Character() );
X
X     read_bytes--;
X     write_bytes--;
X      }
X   }
X
X   /* don't do any zero fill with mode 3 */
X
X   /* discard any leftover input */
X
X   Discard_Block(read_bytes);
X
X   return( store_ptr - address );
X}
X
X
XDiscard_Block(count)
Xunsigned int count;
X{
X    while ( count-- )
X        getchar();
X}
X
XTransfer_Block( count, dest )
Xunsigned int count;
Xunsigned char *dest;
X{
X    fread(dest, 1, count, stdin);
X}
X
X/* this doesn't invert at the moment */
X
XInv_Transfer_Block( count, dest )
Xunsigned int count;
Xunsigned char *dest;
X{
X    fread(dest, 1, count, stdin);
X}
X
X
XOutput_0(src, dest, count)
Xunsigned char *src, *dest;
Xint count;
X{
X    memcpy(dest, src, count);
X
X    if ( zerostrip )
X        while ( count && dest[count-1] == 0 )
X            count--;
X
X    return(count);
X
X}
X
XOutput_1(src, dest, count)
Xunsigned char *src, *dest;
Xregister int count;
X{
X    unsigned char *optr = dest, *iptr;
X    int k,c;
X
X    if ( zerostrip )            /* strip zeros */
X    {
X        iptr = src + count - 1;        /* point to end of data */
X
X        while ( count > 0 && *iptr-- == 0 )    /* hunt thru 0's */
X            count--;
X    }
X
X    iptr = src;
X
X    while ( count ){
X
X        c = *iptr++;        /* get value to work with */
X        count--;
X
X        k = 0;
X
X        while ( *iptr == c && k < 255 && count ){
X            k++;
X            iptr++;
X            count--;
X        }
X
X        *optr++ = k;        /* output repeat count */
X        *optr++ = c;        /* output value */
X    }
X
X    count = optr - dest;        /* for return value */
X
X    return ( count );
X}
X
X
XOutput_2(src, dest, count)
Xunsigned char *src, *dest;
Xregister int count;
X{
X    unsigned char *optr = dest, *iptr;
X    int k,c;
X    unsigned char *tptr, *tptr1, *tptr2;
X    int tk,tc;
X
X
X    if ( zerostrip )            /* strip zeros */
X    {
X        iptr = src + count - 1;        /* point to end of data */
X
X        while ( count > 0 && *iptr-- == 0 )    /* hunt thru 0's */
X            count--;
X    }
X
X    iptr = src;
X
X    while ( count ){
X
X        c = *iptr++;        /* get value to work with */
X        count--;
X
X        k = 0;
X
X        while ( *iptr == c && k < 127 && count ){
X            k++;
X            iptr++;
X            count--;
X        }
X
X        if ( k >= 1 ){
X            *optr++ = 256 - k;    /* output repeat count */
X            *optr++ = c;        /* output value */
X        } else {
X                    /* a two byte replicate run will
X                     * be sent as a repeated byte
X                     * unless it is preceeded and
X                     * and followed by a literal run,
X                     * in which case it is merged
X                     * into the run.
X                     */
X            tk = 0;
X            tc = c;
X            tptr = iptr;
X            tptr1 = tptr;
X            tptr1++;
X            tptr2 = tptr1;
X            tptr2++;
X
X            while ( tk < 128 && (count - tk) > 0    &&
X                ((*tptr != tc) || (*tptr == tc &&
X                                   (count - tk - 1) > 0 &&
X                                   *tptr1 != *tptr &&
X                                   *tptr2 != *tptr1))){
X
X                tc = *tptr++;
X                tk++;
X                tptr1++;
X                tptr2++;
X            }
X
X            if ( count && tk )
X                tk--;
X
X            *optr++ = tk;        /* output count */
X            *optr++ = c;        /* output firstvalue */
X
X            while ( tk-- > 0){
X                *optr++ = *iptr++;
X                count--;
X            }
X
X        }
X    }
X
X    count = optr - dest;        /* for return value */
X
X    return ( count );
X}
X
XOutput_3(seed, new, dest, count)
Xunsigned char *seed, *new, *dest;
Xint count;
X{
X    unsigned char *sptr=seed, *nptr=new, *dptr=dest;
X    int i,j;
X
X
X#if BITFIELDS
X   union comtype {
X      unsigned char comchar;    /* command byte as char */
X      struct btype {
X     unsigned repcount:3;    /* replace count 1-8 */
X     unsigned roff:5;    /* relative offset 0-30 */
X      } bitf;
X   } command;
X#else
X    unsigned char    command;
X#endif
X
X    while ( count > 0 ){
X        i = 0;
X
X                    /* find first diff */
X        while ( *sptr == *nptr && i < count ){
X            i++;
X            sptr++;
X            nptr++;
X        }
X
X        if ( i >= count )    /* too far to find diff */
X            return(dptr - dest);    /* bail */
X
X        count -= i;
X
X        /* now count how many bytes to change */
X
X        for ( j = 1; j < 8; j++)    /* j == 0 is already known */
X            if ( j > count || sptr[j] == nptr[j] )
X                break;
X
X        j--;    /* adjust */
X
X#if BITFIELDS
X        command.bitf.repcount = j;    /* 0-7 ==> 1-8 */
X
X        command.bitf.roff = MIN ( i, 31 );
X
X        *dptr++ = command.comchar;    /* output command */
X#else
X        command = (j << 5);
X        command += MIN( i, 31 );
X        *dptr++ = command;
X#endif
X
X        if ( i == 31 )
X            *dptr++ = 0;
X
X        i -= MIN (i, 31);
X
X        while( i ){
X            *dptr++ = MIN ( i, 255 );
X
X            if ( i == 255 )
X                *dptr++ = 0;
X
X            i -= MIN ( i, 255 );
X        }
X
X        while (j-- >= 0){
X            *dptr++ = *nptr++;
X            sptr++;
X            count--;
X        }
X    }
X
X    return ( dptr - dest );
X}
X
X
X/*----------------------------------------------------------------------*\
X * This is here in case <ESC>*rU is sent after <ESC>*r#A, in which case *
X * we must deallocate the memory to provide for a different amount of   *
X * planes when graphics are sent.                                       *
X\*----------------------------------------------------------------------*/
X
Xfree_mem()
X{
X    int r;
X
X
X    if ( !memflag )
X        return;        /* no memory to free */
X
X    free(new_row);
X
X    for(r = MAXMODES -1; r >= 0; r--)
X        free(out_row[r]);
X
X    for(r = num_planes - 1; r >= 0; r--)
X        free(seed_row[r]);
X
X    memflag = FALSE;
X}
END_OF_FILE
  if test 52617 -ne `wc -c <'pclcomp.c'`; then
    echo shar: \"'pclcomp.c'\" unpacked with wrong size!
  fi
  # end of 'pclcomp.c'
fi
echo shar: End of archive 2 \(of 2\).
cp /dev/null ark2isdone
MISSING=""
for I in 1 2 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked both archives.
    rm -f ark[1-9]isdone
else
    echo You still must unpack the following archives:
    echo "        " ${MISSING}
fi
exit 0
exit 0 # Just in case...
--
Kent Landfield                   INTERNET: [e-mail]
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