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- /*
- ** Pclcomp -- PCL compression filter.
- **
- ** If you have any problems or errors to report, please send them to me:
- **
- ** Tony Parkhurst
- **
- ** Email address: tony@sdd.hp.com -or- hp-sdd!tony
- **
- ** Please send a copy of the graphic file that is a problem, and the version
- ** of pclcomp you are using.
- **
- ** All suggestions and requests are welcome.
- */
-
- /*
- ***************************************************************************
- *
- * $Source: /disc/44/cgtriton/tony/filters/pclcomp/RCS/pclcomp.c,v $
- * $Date: 91/05/30 15:18:51 $
- * $Revision: 1.31 $
- *
- * Description: Compresses pcl graphics files.
- *
- * Author: Tony Parkhurst
- * Created: 890427
- * Language: C
- *
- * (c) Copyright 1989, Hewlett-Packard Company, all rights reserved.
- *
- ***************************************************************************
- */
-
-
- /*
- ***************************************************************************
- *
- * $Log: pclcomp.c,v $
- * Revision 1.31 91/05/30 15:18:51 15:18:51 tony (Tony Parkhurst)
- * Oops, fixed it right this time.
- *
- * Revision 1.30 91/05/30 15:06:20 15:06:20 tony (Tony Parkhurst)
- * Added fix for negative value for <esc>*r#U.
- *
- * Revision 1.29 91/05/03 10:12:30 10:12:30 tony (Tony Parkhurst)
- * Small changes.
- *
- * Revision 1.28 91/04/30 09:41:24 09:41:24 tony (Tony Parkhurst)
- * Now puts stdin and stdout in binary mode for MSDOS.
- * Changes courtesy of Mike Slomin.
- * Changed usage message a bit.
- *
- * Revision 1.27 91/04/23 15:48:05 15:48:05 tony (Tony Parkhurst)
- * Added handling of plus_sign in value fields.
- *
- * Revision 1.26 91/04/23 09:47:11 09:47:11 tony (Tony Parkhurst)
- * Pass thru unknown modes.
- *
- * Revision 1.25 91/04/18 11:09:27 11:09:27 tony (Tony Parkhurst)
- * Added parse for fractions in values (i.e. <esc>(s16.67H)
- *
- * Revision 1.24 91/04/10 14:16:30 14:16:30 tony (Tony Parkhurst)
- * strips text and control codes between <esc>*rA and <esc>*rB w/ -s option
- *
- * Revision 1.23 91/04/05 14:53:25 14:53:25 tony (Tony Parkhurst)
- * Added fixed for deskjet
- * Also added a stripping feature.
- *
- * Revision 1.22 91/04/05 08:48:53 08:48:53 tony (Tony Parkhurst)
- * Added some error checkin on output for MS-DOS users.
- *
- * Revision 1.21 91/04/04 12:53:32 12:53:32 tony (Tony Parkhurst)
- * Replaced parser.
- * Now handles combined escape sequences.
- * Now handles downloads.
- * Now combines mode changes with data.
- *
- * Revision 1.20 91/04/04 08:02:12 08:02:12 tony (Tony Parkhurst)
- * Removed some test code.
- *
- * Revision 1.19 91/03/25 14:38:48 14:38:48 tony (Tony Parkhurst)
- * Changed defaults.
- *
- * Revision 1.18 91/03/25 14:31:22 14:31:22 tony (Tony Parkhurst)
- * Re-worked memory allocation stuff for funky input files.
- *
- * Revision 1.17 91/03/25 13:50:19 13:50:19 tony (Tony Parkhurst)
- * Use command line args for file w/o -i or -o.
- *
- * Revision 1.16 91/03/04 14:23:15 14:23:15 tony (Tony Parkhurst)
- * Fixed to allow ONLY mode 3 if the user really wants it.
- *
- * Revision 1.15 91/03/04 14:08:23 14:08:23 tony (Tony Parkhurst)
- * Added an exit(0) at the end of main.
- * fixed up some zerostrip stuff.
- * made mode 3 the highest priority mode.
- *
- * Revision 1.14 91/02/20 13:57:27 13:57:27 tony (Tony Parkhurst)
- * Changed priority a bit.
- * Added some zerostripping for mode 2.
- *
- * Revision 1.13 91/02/06 15:31:00 15:31:00 tony (Tony Parkhurst)
- * oops.
- *
- * Revision 1.12 91/02/06 14:41:28 14:41:28 tony (Tony Parkhurst)
- * fixed usage message
- *
- * Revision 1.11 91/02/06 14:38:10 14:38:10 tony (Tony Parkhurst)
- * Added file input and output for MS-DOS.
- *
- * Revision 1.10 91/02/05 17:49:23 17:49:23 tony (Tony Parkhurst)
- * Fixed problem with zero stripped input.
- *
- * Revision 1.9 91/02/05 16:11:39 16:11:39 tony (Tony Parkhurst)
- * Removed delay code and bitfield stuff.
- *
- * Revision 1.8 91/02/05 11:04:53 11:04:53 tony (Tony Parkhurst)
- * Added io delay stuff for testing.
- *
- * Revision 1.7 91/02/05 10:28:32 10:28:32 tony (Tony Parkhurst)
- * Fix for someone specifing ONLY mode 3.
- *
- * Revision 1.6 91/01/29 14:13:09 14:13:09 tony (Tony Parkhurst)
- * Updated some comments.
- *
- * Revision 1.5 91/01/29 13:26:24 13:26:24 tony (Tony Parkhurst)
- * Cleaned up, revamped a bit.
- *
- * Revision 1.4 89/11/09 15:59:16 15:59:16 tony (Tony Parkhurst)
- * Fix for esc * r U coming after esc * r A.
- *
- * Revision 1.3 89/10/24 11:31:12 11:31:12 tony (Tony Parkhurst)
- * Added parsing of <esc>*rC
- *
- * Revision 1.2 89/10/13 09:56:46 09:56:46 tony (Tony Parkhurst)
- * Completely revamped by Greg G.
- *
- * Revision 1.1 89/06/15 13:57:46 13:57:46 tony (Tony Parkhurst)
- * Initial revision
- *
- *
- ***************************************************************************
- */
-
- static const char copyr[]=
- "Copyright (c) 1991, Hewlett-Packard Company, all rights reserved.";
-
- static const char author[]="Tony Parkhurst";
-
- static const char rcs_id[]="$Header: pclcomp.c,v 1.31 91/05/30 15:18:51 tony Exp $";
-
- static const char rev_id[]="$Revision: 1.31 $";
-
-
- /* This program takes a PCL graphics file and will try and
- * optimize the compression.
- */
-
- /*
- * This program was first a filter by Dean to compress pcl graphics.
- *
- * This program now will do optimal compression using modes 0,1,2 and 3
- *
- * Also, this program will take compressed input.
- *
- * Input and output formats are standard pcl.
- *
- * Imaging files will be compressed too.
- *
- * pclcomp does not take advantage of Y-Offset for blank areas.
- * This is because Y-Offset creates white areas, but we don't do enough
- * parsing to determine what value "white" has. An application that
- * can assume white values could make use of this sequence.
- *
- * pclcomp does not do any of the block compression modes (4-8).
- *
- * There are a few obvious inefficiencies that I will fix later.
- *
- * Speaking of mode 3, there is a possible problem because each of the
- * output row storage areas are 2* size of what mode 0 would be. This
- * is clearly sufficient for modes 1 and 2, but it may not be for mode
- * 3. But I cannot think of a case in Mode 3 where this would be a problem.
- *
- * An additional enhancement would be to compare all the planes in a
- * multi-plane file (color) and if nothing changed, using mode 3, just
- * output a single <esc>*b0W.
- */
-
- /*
- * Usage: pclcomp [-v] [-0] [-1] [-2] [-3] [-z] [-n###] < infile > outfile
- *
- * Pclcomp will do graphics compression based on compression modes 0, 1, 2
- * and 3. (Mode 0 is uncompressed). Pclcomp will accept all modes, and
- * will attempt to optimize by selecting the best output mode for each
- * row (or plane) of data. By default, pclcomp will use all 4 modes, but
- * the user may restrict which output modes to use with the -0123 options.
- * For example, to use pclcomp for output to a PaintJet which only knows
- * modes 0 and 1 (the XL also understands modes 2 and 3), one would use:
- *
- * pclcomp -01 < infile > outfile
- *
- * Note: Mode 0 should always be allowed. None of the other modes is
- * guaranteed to be better than mode 0 in all cases.
- *
- * The 'v' option tells the number of rows (planes) of data input and output
- * in the different modes (to stderr).
- *
- * The 'z' option is useful for PaintJet files using only modes 0 and 1, it
- * does zero "stripping" as the PaintJet will do zero "filling".
- * NOTE: 'z' now means do NOT zerostrip.
- *
- * The 'n' option is to change the default number of pixels in a picture.
- * The proper way to set the pixel width is with the source raster width
- * sequence <esc*r#S>, but soo many applications just assume the default,
- * which is different on different printers, so I am providing this
- * command line option to set a new default. One could also change the
- * DEFAULT constant below (make sure it is a multiple of 8). Currently
- * it is set to 8" at 180 dpi (1440), but for 300 dpi, set it to 2400.
- *
- * default is now 2400 (for 300dpi ala LaserJet).
- */
-
- #include <stdio.h>
- #include <string.h>
-
- #ifdef MSDOS
- #include <fcntl.h>
- #endif
-
-
- /* This flag is for code that uses bitfields for 68000 systems */
- #define BITFIELDS 0
-
- #define Get_Character() getchar()
-
- #define MIN(x,y) ( ((x) < (y)) ? (x) : (y) )
-
- #define TRUE 1
- #define FALSE 0
-
- #define ESC 27
-
- #define DEFAULT 2400 /* default width in pixels (multiple of 8) */
-
- #define MAXMODES 4
- #define MAXPLANES 8
- #define MAXBYTES 60000 /* now mostly meaningless, just a big number */
-
- unsigned char *seed_row[MAXPLANES];
- unsigned char *new_row;
- unsigned char *out_row[MAXMODES];
- unsigned int out_size[MAXMODES];
-
- char memflag = FALSE; /* set when memory has been allocated */
-
-
- char mode0=FALSE,
- mode1=FALSE,
- mode2=FALSE,
- mode3=FALSE;
-
- unsigned char num_planes=1;
- unsigned char curr_plane=0;
-
- char imaging = FALSE; /* not imaging, so no lockout */
-
- char verbose = FALSE;
-
- unsigned char inmode = 0; /* input compression mode */
- unsigned char outmode = 0; /* output compression mode */
-
- unsigned int rasterwidth=DEFAULT/8; /* width of picture, in bytes */
- unsigned int rpix = DEFAULT; /* width of picture, in pixels */
-
- unsigned char invert=FALSE; /* invert the data (obsolete) */
-
- unsigned char zerostrip= TRUE; /* strip trailing zeros */
-
- unsigned int inuse[4]={0,0,0,0}, outuse[4] = {0,0,0,0};
-
- char widthwarning = FALSE; /* for trucation warning */
- char firstrow = TRUE; /* to prevent mode 3 from being first */
-
-
- struct { /* this will hold the data for the */
- unsigned char model; /* configuring of image processing */
- unsigned char pix_mode;
- unsigned char inx_bits;
- unsigned char red;
- unsigned char green;
- unsigned char blue;
- short wr;
- short wg;
- short wb;
- short br;
- short bg;
- short bb;
- } imdata;
-
- extern unsigned char *malloc();
-
- char *filein = NULL, *fileout = NULL;
-
- /*
- ** These variables are for the new parser.
- ** The new parser handles more sequences, and also deals with combined
- ** escape sequences better.
- */
-
- int parameter;
- int group_char;
- int terminator;
- int old_terminator;
- int value;
- int frac;
- int scanf_count;
- char in_sequence = FALSE;
- char pass_seq;
- char plus_sign; /* for relative values */
-
-
- /* dummy buffer */
- char buf[BUFSIZ];
-
- /*
- ** If the printer is a DeskJet, then we must handle <esc>*rB differently
- ** Option '-d' will turn on this mode.
- */
-
- char deskjet = FALSE;
-
-
- /*
- ** Many drivers it seems put <esc>*rB<esc>*rA between each and every row
- ** of data. This defeats compression mode 3 on a DeskJet, and also
- ** makes the PaintJet (not XL) quite slow. This next flag "-s" on the
- ** command line, will attempt to do a reasonable job of stripping
- ** out the excess commands.
- **
- ** The in_graphics flag will be used to strip unwanted control chars from
- ** the file.
- */
-
- char strip_seq = FALSE;
- char in_graphics = FALSE;
-
-
- /*
- ** Just for certain special cases, it would be nice to append an <esc>E reset
- ** to the end of the job. Specify with "-r".
- */
-
- char reset_seq = FALSE;
-
-
- char *progname; /* to hold the program name for verbose */
-
-
-
- /*
- **
- ** Main program.
- **
- */
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- int c,j;
- extern char *optarg;
- extern int optind;
-
- progname = argv[0];
-
- #ifdef MSDOS
- setmode(fileno(stdin), O_BINARY); /* Place stdin and stdout in */
- setmode(fileno(stdout), O_BINARY); /* binary mode. (Mike Slomin)*/
- #endif
-
- /* parse up the args here */
-
- while ((c = getopt(argc, argv, "0123drsvzn:i:o:s")) != EOF )
- switch(c){
- case '0':
- mode0++;
- break;
- case '1':
- mode1++;
- break;
- case '2':
- mode2++;
- break;
- case '3':
- mode3++;
- break;
- case 'd':
- deskjet++;
- break;
- case 'r':
- reset_seq++;
- break;
- case 's':
- strip_seq++;
- break;
- case 'v':
- verbose++;
- break;
- case 'z':
- zerostrip = FALSE;
- break;
- case 'n':
- rpix = atoi(optarg); /* new default */
- rasterwidth = (rpix + 7) / 8; /* round up */
- break;
-
- case 'i':
- filein = optarg;
- break;
- case 'o':
- fileout = optarg;
- break;
-
- case '?':
- default:
- fprintf(stderr, "Usage: %s [-0123drsvz] [-n###] [infile [outfile]]\n",
- argv[0]);
- exit(-1);
- };
-
- if ( verbose )
- {
- fprintf(stderr, "%s: %s\n", argv[0], rev_id);
- }
-
-
- if ( ! ( mode0 || mode1 || mode2 || mode3) ) /* any modes on? */
- mode0 = mode1 = mode2 = mode3 = TRUE; /* all modes by default */
-
- /*
- ** Check to see if any file args were given on the command line.
- ** Ones that were not preceded by a "-i" or "-o".
- */
-
- if ( filein == NULL && optind < argc && argv[optind] != NULL )
- filein = argv[optind++];
-
- if ( fileout == NULL && optind < argc && argv[optind] != NULL )
- fileout = argv[optind++];
-
- /*
- ** Now open files for stdin and stdout if provided by the user.
- */
-
- if ( filein != NULL ) /* new input file */
-
- if ( freopen( filein, "rb", stdin ) == NULL )
- {
- fprintf(stderr,"Unable to open %s for input.\n",filein);
- exit(-42);
- }
-
- if ( fileout != NULL ) /* new output file */
-
- if ( freopen( fileout, "wb", stdout ) == NULL )
- {
- fprintf(stderr, "Unable to open %s for output.\n",
- fileout);
- exit(-43);
- }
-
-
- /*
- ** This is the pcl input parsing loop.
- */
-
- while( ( c = getchar() ) != EOF )
- {
-
- /* Ignore all chars until an escape char */
-
- /*
- ** If we are in graphics, toss it if strip_seq is set.
- */
-
- if ( c != ESC )
- {
- if ( !strip_seq || !in_graphics )
- putchar(c); /* pass it thru */
-
- continue; /* pop to the top of the loop */
- }
-
- /*
- ** Now we have an escape sequence, get the parameter char.
- */
-
- parameter = getchar();
-
- if ( parameter == EOF ) /* oops */
- {
- putchar ( ESC );
- fprintf(stderr, "Warning: File ended with <esc>.\n");
- break; /* unexpected end of input */
- }
-
- /*
- ** Now check to see if it is a two character sequence.
- */
-
- if ( parameter >= '0' && parameter <= '~' )
- {
- putchar ( ESC );
- putchar ( parameter ); /* pass it thru */
-
- /*
- ** If the second character is an E, then we
- ** and the printer do a reset.
- */
-
- if ( parameter == 'E' )
- {
- free_mem();
- curr_plane = 0;
- num_planes = 1;
- imaging = FALSE;
- inmode = 0;
- outmode = 0;
- in_graphics = FALSE;
-
- /* can't do this if user gave value with -n.
- rasterwidth = DEFAULT/8;
- rpix = DEFAULT;
- */
- }
-
- continue; /* return to the top */
- }
-
- /*
- ** Now check to make sure that the parameter character is
- ** within range.
- */
-
- if ( parameter < '!' || parameter > '/' )
- {
- putchar ( ESC );
- putchar ( parameter );
-
- fprintf(stderr, "Warning: Invalid escape sequence.\n");
-
- continue;
- }
-
- /*
- ** We are only interested in certain parameters, so pass
- ** the rest of the sequences.
- */
-
- /*
- ** For the moment, we are only interested in '*' (graphics)
- ** '(' and ')' (downloads). Although we do not do anything
- ** with downloads, we need to pass the binary data thru
- ** untouched.
- ** Also, '&' is handled too.
- */
-
- if ( parameter != '*' && parameter != '('
- && parameter != ')' && parameter != '&' )
- {
- putchar ( ESC );
- putchar ( parameter );
- Flush_To_Term(); /* flush rest of seq. */
- continue;
- }
-
-
- /*
- ** Parameter character is in range, look for a valid group char
- */
-
- group_char = getchar();
-
- if ( group_char == EOF ) /* oops, ran out of input */
- {
- putchar ( ESC );
- putchar ( parameter );
-
- fprintf(stderr, "Warning: Incomplete escape sequence.\n");
- break;
- }
-
- /*
- ** See if in proper range. If it isn't, it is not an error
- ** because the group character is optional for some sequences.
- ** For the moment, we are not interested in those sequences,
- ** so pass them thru.
- */
-
- if ( group_char < '`' || group_char > '~' )
- {
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group_char );
- if ( group_char < '@' || group_char > '^' )
- Flush_To_Term(); /* pass rest of seq. */
- continue;
- }
-
- /*
- ** Now we have a valid group character, decide if we want
- ** to deal with this escape sequence.
- **
- ** Sequences we want do deal with include:
- **
- ** <esc>*r ** graphics
- ** <esc>*b ** graphics
- ** <esc>*v ** graphics
- **
- ** Sequences we must pass thru binary data:
- **
- ** <esc>*c ** pattern
- ** <esc>*t ** obsolete
- ** <esc>(f ** download char set
- ** <esc>(s ** download char
- ** <esc>)s ** download font
- ** <esc>&a ** logical page
- ** <esc>&l ** obsolete
- **
- */
-
- if ( ( parameter == '*'
- && group_char != 'r' && group_char != 'b'
- && group_char != 'v' && group_char != 'c'
- && group_char != 't' )
- || ( parameter == '&'
- && group_char != 'a' && group_char != 'l' )
- || ( parameter == '('
- && group_char != 'f' && group_char != 's' )
- || ( parameter == ')' && group_char != 's' ) )
- {
- /*
- ** Definately not interested in the sequence.
- */
-
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group_char );
- Flush_To_Term();
- continue;
- }
-
- /*
- ** Now set up a pass thru flag so we can ignore the entire
- ** sequences of some of these.
- */
-
- if ( parameter != '*' )
- pass_seq = TRUE;
- else if ( group_char == 'c' || group_char == 't' )
- pass_seq = TRUE;
- else
- pass_seq = FALSE;
-
-
- /*
- ** Now we have a sequence that we are definately interested in.
- **
- ** Get the value field and terminator, and loop until final
- ** terminator is found.
- */
-
- do
- {
- /* first see if the value has a plus sign */
-
- scanf_count = scanf(" + %d", &value );
-
- if ( scanf_count == 1 )
-
- plus_sign = TRUE;
- else
- {
- plus_sign = FALSE;
-
- scanf_count = scanf(" %d", &value );
-
- if ( scanf_count == 0 )
- value = 0; /* by default */
- }
-
- terminator = getchar();
-
- /*
- ** check to see if a fractional parameter was passed.
- */
-
- frac = 0; /* in case no fraction */
-
- if ( terminator == '.' )
- {
- /*
- ** Need to get fractional part.
- **
- ** This will not work properly if the
- ** fraction is < .1 (i.e. a leading 0 is
- ** present). For example, the value
- ** 14.05 for point size, which would get
- ** rounded to 14.00 for scalable fonts,
- ** would get passed thru as 14.5 which is
- ** rounded to 14.5. This is unlikely to
- ** happen as the 14.05 case is rare, but
- ** it is valid PCL, so I will fix this
- ** in the future.
- */
-
- if ( scanf("%d", &frac) != 1 )
- {
- frac = 0; /* no frac? */
- }
-
- /*
- ** Now get the real terminator.
- */
-
- terminator = getchar();
- }
-
-
- if ( terminator == EOF ) /* barf */
- {
- fprintf(stderr, "Warning: Incomplete sequence at end of file.\n");
- break;
- }
-
- /*
- ** If the pass_seq flag is set, then just pass
- ** it thru to stdout until a 'W' is found.
- */
-
- if ( pass_seq )
- {
- /*
- ** If not in sequence, then we output esc
- ** otherwise, output the saved terminator.
- */
-
- if ( !in_sequence )
- {
- in_sequence = TRUE;
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group_char );
- } else
- {
- putchar ( old_terminator );
- }
-
- /* now pass the value */
-
- if ( plus_sign )
- putchar('+');
-
- if ( scanf_count ) /* there was a value */
- printf("%0d", value);
-
- /* need to output the fractional part */
-
- if ( frac )
- printf(".%0d", frac);
-
- /*
- ** We save the terminator, because we may
- ** need to change it to upper case.
- */
-
- old_terminator = terminator;
-
- /* if binary data, pass it thru */
-
- if ( terminator == 'W' ) /* aha */
- {
- putchar ( terminator );
- in_sequence = FALSE; /* terminates */
- Flush_Bytes ( value ); /* pass data */
- }
-
- continue;
- }
-
- /*
- ** Ok, this is a sequence we want to pay attention to.
- **
- ** Do_Graphics returns TRUE if we need to pass seq.
- **
- ** Note: Do_Graphics modifies the parser vars such
- ** as in_sequence. This is because it may
- ** have to output stuff directly.
- */
-
- if ( Do_Graphics ( group_char, value, terminator ) )
- {
- /*
- ** If not in sequence, then we output esc
- ** otherwise, output the saved terminator.
- */
-
- if ( !in_sequence )
- {
- in_sequence = TRUE;
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group_char );
- } else
- {
- putchar ( old_terminator );
- }
-
- /* now pass the value */
-
- if ( plus_sign )
- putchar('+');
-
- if ( scanf_count ) /* there was a value */
- printf("%0d", value);
-
- /* need to output the fractional part */
-
- if ( frac )
- printf(".%0d", frac);
-
- /*
- ** We save the terminator, because we may
- ** need to change it to upper case.
- */
-
- old_terminator = terminator;
- }
-
- } while ( terminator >= '`' && terminator <= '~' );
-
- /*
- ** The oppsite test (above) may be more appropriate. That is,
- ** !(terminator >= '@' && terminator <= '^').
- */
-
- /*
- ** If we were in a sequence, then we must terminate it.
- ** If it was lower case, then it must be uppered.
- */
-
- if ( in_sequence )
- {
- putchar ( terminator & 0xdf ); /* a ==> A */
- in_sequence = FALSE;
- }
- }
-
-
- /*
- ** If the user wants a reset, give him one.
- */
-
- if ( reset_seq )
- {
- putchar ( ESC );
- putchar ( 'E' );
- }
-
-
- /*
- ** Finished up, so print stats and close output file.
- */
-
- fclose(stdout);
-
-
- if ( verbose )
- {
- for(j = 0; j < 4; j++)
- fprintf(stderr,"Rows in mode %1d: %d\n", j, inuse[j]);
- for(j = 0; j < 4; j++)
- fprintf(stderr,"Rows out mode %1d: %d\n", j, outuse[j]);
- }
-
- exit(0);
- }
-
-
- /*
- ** Do_Graphics() takes the graphics escape sequence and performs the
- ** necessary functions.
- ** TRUE is returned if the escape sequence needs to be passed to the output.
- */
-
- int Do_Graphics( group, num, terminator )
- int group, num, terminator;
- {
-
- /* first look at vW */
-
- if ( group == 'v' )
-
- if ( terminator != 'W' )
-
- return ( TRUE ); /* pass it thru */
- else
- {
- if ( !in_sequence )
- {
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group );
- } else
- putchar ( old_terminator );
-
- in_sequence = FALSE; /* terminating */
-
- printf("%0d", num);
- putchar ( terminator );
-
- free_mem(); /* reset memory */
-
- imaging++;
-
- fread(&imdata, MIN(num, 18), 1, stdin);
- fwrite(&imdata, MIN(num, 18), 1, stdout);
-
- num -= MIN(num, 18);
-
- /* copy rest of unknown data */
-
- if ( num > 0 )
- Flush_Bytes(num);
-
-
- switch(imdata.pix_mode){
- case 0x00:
- rasterwidth = (rpix + 7)/8;
- num_planes = imdata.inx_bits;
- break;
- case 0x01:
- rasterwidth = rpix*imdata.inx_bits/8;
- break;
- case 0x02:
- rasterwidth = (rpix + 7)/8;
- num_planes =imdata.red + imdata.green +
- imdata.blue;
- break;
- case 0x03:
- rasterwidth = (imdata.red +
- imdata.green +
- imdata.blue)*rpix/8;
- break;
- }
-
- return ( FALSE );
- }
-
- /*
- ** Now deal with <esc>*r stuff
- */
-
- if ( group == 'r' )
- {
- switch ( terminator )
- {
- case 'A':
- case 'a':
-
- /* in graphics mode, may do stripping */
- in_graphics = TRUE;
-
- /* if user wants to strip redundant seq */
- if ( strip_seq && memflag )
- return( FALSE );
-
- curr_plane=0;
- zero_seeds(); /* may allocate mem */
- break;
-
- case 'C':
- case 'c':
-
- /* not in graphics disable code strip */
-
- in_graphics = FALSE;
-
- if ( strip_seq )
- return( FALSE );
-
- inmode = 0;
- outmode = 0;
-
- free_mem();
- curr_plane=0;
- break;
-
- case 'B':
- case 'b':
-
- /* not in graphics disable code strip */
-
- in_graphics = FALSE;
-
- if ( strip_seq )
- return( FALSE );
-
- if ( deskjet ) /* B resets modes on DJ */
- {
- inmode = 0;
- outmode = 0;
- }
- free_mem();
- curr_plane=0;
- break;
-
- case 'S':
- case 's':
-
- /* free mem in case widths changed */
- free_mem();
-
- rpix = num;
-
- if (imaging){
- switch(imdata.pix_mode)
- {
- case 0x00:
- rasterwidth=(rpix+7)/8;
- break;
- case 0x01:
- rasterwidth =
- rpix*imdata.inx_bits/8;
- break;
- case 0x02:
- rasterwidth=(rpix+7)/8;
- break;
- case 0x03:
- rasterwidth =
- (imdata.red
- + imdata.green
- + imdata.blue)*rpix/8;
- break;
- }
- } else
- rasterwidth = (num + 7) / 8;
- break;
-
- case 'T':
- case 't':
- break;
-
- case 'U':
- case 'u':
- curr_plane=0;
- free_mem(); /* if ESC*rA came first */
-
- /* num can be negative */
-
- if ( num < 0 )
- num_planes= -num;
- else
- num_planes = num;
-
- imaging = FALSE; /* goes off */
- break;
-
- default:
- break;
- }
-
- return ( TRUE ); /* pass sequence on */
-
- } /* group r */
-
- /*
- ** Last and final group 'b'. All the graphics data comes thru here.
- */
-
-
- switch ( terminator )
- {
- case 'm':
- case 'M':
- inmode = num;
- return ( FALSE ); /* we do NOT pass this */
- break;
-
- /*
- ** <esc>*b#X is obsolete, don't bother with it.
- ** If I did do something, then I would zero part of the
- ** seed rows.
- */
-
- case 'x':
- case 'X':
- break;
-
- case 'y':
- case 'Y':
- /* zero only if allocated */
- if ( memflag )
- zero_seeds();
- break;
-
- case 'W':
- if(!memflag)
- zero_seeds(); /* get memory */
-
- /* fire up sequence */
-
- if ( !in_sequence )
- {
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group );
- } else
- putchar ( old_terminator );
-
- in_sequence = FALSE; /* terminating */
-
- if(curr_plane < num_planes)
- {
-
- Process(num, 'W');
-
- if ( curr_plane + 1 < num_planes )
- {
- /* now we have a problem */
- zero_upper(curr_plane + 1);
- }
- } else
- Process_extra(num,'W');
-
- curr_plane=0;
-
- return ( FALSE );
-
- break;
-
- case 'V':
- if(!memflag)
- zero_seeds(); /* get memory */
-
- /*
- ** If curr_plane is the last plane, this should
- ** be a 'W', not a 'V'. I could change it,
- ** then I would fix Process_extra() to not output
- ** anything as the 'W' was already sent.
- */
-
- if( curr_plane < num_planes )
- {
- /* fire up sequence */
-
- if ( !in_sequence )
- {
- putchar ( ESC );
- putchar ( parameter );
- putchar ( group );
- } else
- putchar ( old_terminator );
-
- in_sequence = FALSE; /* terminating */
-
-
- Process(num, 'V');
- curr_plane++;
- } else
- Process_extra(num,'V');
-
- return ( FALSE );
-
- break;
-
- default:
- break;
- }
-
- return ( TRUE ); /* pass sequence */
- }
-
-
-
- /*
- ** Flush_To_Term() simply passes thru input until a valid terminator
- ** character is found. This is for unwanted escape sequences.
- */
-
- Flush_To_Term()
- {
- int c;
-
- do
- {
- c = getchar();
-
- if ( c == EOF ) /* this is a problem */
- return;
-
- putchar ( c );
-
- } while ( c < '@' || c > '^' );
- }
-
-
- /*
- ** Flush_Bytes() simply transfers so many bytes directly from input to output.
- ** This is used to pass thru binary data that we are not interested in so that
- ** it will not confuse the parser. I.e. downloads.
- */
-
- Flush_Bytes( num )
- unsigned int num;
- {
- int bnum;
-
- while ( num > 0 )
- {
- bnum = MIN ( BUFSIZ, num );
-
- fread( buf, 1, bnum, stdin );
-
- if ( fwrite( buf, 1, bnum, stdout ) < bnum )
-
- /* check for error and exit */
-
- if ( ferror(stdout) )
- {
- perror("Output error");
- exit(-2);
- }
-
- num -= bnum;
- }
- }
-
-
-
-
- /*----------------------------------------*/
-
- /*
- ** Zero_seeds() will allocate and initialize memory.
- ** If memory has already been allocated, then it will just initialize it.
- */
-
-
- zero_seeds()
- {
- int r;
-
- /* first allocate and init seed_rows for number of planes. */
-
- for ( r = 0; r < num_planes ; r++)
- {
- if(!memflag)
- {
- seed_row[r] = (unsigned char *) malloc(rasterwidth);
-
- if ( seed_row[r] == NULL )
- {
- fprintf(stderr, "Out of memory.\n");
- exit(-3);
- }
- }
-
- /* zero seeds for mode 3 */
-
- memset(seed_row[r], 0, rasterwidth);
- }
-
-
- if(!memflag)
- {
- new_row = (unsigned char *) malloc(rasterwidth);
-
- if ( new_row == NULL )
- {
- fprintf(stderr, "Out of memory.\n");
- exit(-3);
- }
-
- for(r=0; r<MAXMODES; r++)
- {
- /* 2 * width is needed for modes 1, 2 and 3 */
-
- out_row[r] = (unsigned char *) malloc(2 * rasterwidth);
-
- if ( out_row[r] == NULL )
- {
- fprintf(stderr, "Out of memory.\n");
- exit(-3);
- }
- }
-
- }
-
- memset(new_row, 0, rasterwidth);
-
- memflag = TRUE; /* memory is in place */
- }
-
-
- /* this routine if for incomplete transfers of data */
-
- zero_upper(plane)
- int plane;
- {
- int i;
-
- /* assume memory already present */
-
- for ( i = plane; i < num_planes; i++)
- memset(seed_row[i], 0, rasterwidth);
- }
-
-
- Process(inbytes, terminator)
- int inbytes, terminator;
- {
-
- int insize;
- int minmode = 0;
-
- inuse[inmode]++;
-
- switch ( inmode ) {
-
- case 0:
- if ( !widthwarning && inbytes > rasterwidth )
- {
- /* This is likely to result in data truncation. */
- widthwarning = TRUE;
- fprintf(stderr,"Warning: Input pixel width exceeds expected width.\n");
- }
-
- insize = Mode_0_Graphics(inbytes,rasterwidth,new_row,invert);
- break;
- case 1:
- insize = Mode_1_Graphics(inbytes,rasterwidth,new_row,invert);
- break;
- case 2:
- insize = Mode_2_Graphics(inbytes,rasterwidth,new_row,invert);
- break;
- case 3:
- memcpy(new_row, seed_row[curr_plane], rasterwidth);
- insize = Mode_3_Graphics(inbytes,rasterwidth,new_row,invert);
- break;
-
- default: /* unknown mode? */
-
- /* Don't know what to do about seed rows, pass stuff thru */
-
- fprintf(stderr, "%s: Unsupported compression mode %d.\n",
- progname, inmode );
-
- ChangeMode(inmode); /* go to that mode */
-
- /* <esc>*b has already been output */
-
- printf("%1d%c", inbytes, terminator);
-
- Flush_Bytes( inbytes );
-
- firstrow = TRUE; /* pop it out of mode 3 */
-
- /* Go ahead and clear the seed rows if present */
- if ( memflag )
- zero_seeds();
-
- return;
-
- }
-
-
- /*
- **
- */
-
- if ( mode0 )
- /* actually, this is redundant since new_row is mode 0 */
- out_size[0] = Output_0( new_row, out_row[0], rasterwidth );
- else
- out_size[0] = MAXBYTES+1;
-
- if ( mode1 )
- out_size[1] = Output_1( new_row, out_row[1], rasterwidth );
- else
- out_size[1] = MAXBYTES+1;
-
- if ( mode2 )
- out_size[2] = Output_2( new_row, out_row[2], rasterwidth );
- else
- out_size[2] = MAXBYTES+1;
-
- if ( mode3 )
- out_size[3] = Output_3( seed_row[curr_plane], new_row, out_row[3], rasterwidth );
- else
- out_size[3] = MAXBYTES+1;
-
-
- /*
- ** Now determine which mode will give the best output. Note that it
- ** takes 5 bytes to change modes, so we penalize all modes that are
- ** not the current output by 5 bytes. This is to discourage changing
- ** unless the benifit is worth it. The exception to this rule is
- ** mode 3. We want to encourage going to mode 3 because of the seed
- ** row behaviour. That is, if we have a simple picture that does
- ** not change much, and say each of the sizes for modes 1 and 2 always
- ** comes out to 4 bytes of data, then if we add 5 to mode 3 each time,
- ** it would never get selected. But, we remove the penalty, and if
- ** mode 3 is selected (0 bytes of data needed for mode 3), then each
- ** succesive row only needs 0 bytes of data. For a 300 dpi A size
- ** picture with 3 data planes, this could be a savings of 37k bytes.
- */
-
- /*
- ** With the new parser, the output to change modes is now only
- ** 2 bytes, since it gets combined with the *b#W sequence.
- ** So, I decided to ignore the switching penalty.
- */
-
- /*
- ** Due to a possible bug in PaintJet XL, don't allow mode 3 to be
- ** selected for the first row of output. But do allow it if the
- ** user has no other mode selected.
- */
-
- if ( firstrow && (mode0 || mode1 || mode2) )
- {
- out_size[3] = MAXBYTES+1; /* disable mode 3 for now */
-
- if ( terminator == 'W' ) /* last plane? */
- firstrow = FALSE; /* no longer first row */
- }
-
-
- minmode = 3;
-
- if ( out_size[2] < out_size[minmode] )
- minmode = 2;
-
- if ( out_size[1] < out_size[minmode] )
- minmode = 1;
-
- if ( out_size[0] < out_size[minmode] )
- minmode = 0;
-
-
- /* I may remove this sometime */
- if ( minmode != outmode )
- if ( out_size[minmode] == out_size[outmode] )
- minmode = outmode;
-
-
- outuse[minmode]++;
-
- if ( outmode != minmode )
- ChangeMode( minmode );
-
- /* <esc>*b has already been output */
-
- printf("%1d%c", out_size[minmode], terminator);
-
- if ( fwrite( out_row[minmode], 1, out_size[minmode], stdout) <
- out_size[minmode] )
-
- /* check for error and exit */
-
- if ( ferror(stdout) )
- {
- perror("Output error");
- exit(-2);
- }
-
-
- memcpy(seed_row[curr_plane], new_row, rasterwidth);
-
- }
-
- Process_extra(bytes, terminator)
- int bytes;
- char terminator;
- {
- int i;
-
- /* toss any excess data */
-
- for(i = 0; i < bytes; i++)
- getchar();
-
- /* last plane? force move down to next row */
-
- if(terminator == 'W')
- {
- /* <esc>*b has already been output */
- printf("0W");
-
- firstrow = FALSE; /* not on first row anymore */
-
- }
-
- }
-
- ChangeMode(newmode)
- int newmode;
- {
- /*
- ** <esc>*b have already been output.
- ** terminator is 'm' instead of 'M' since will be followed by 'W'
- */
- printf("%1dm", newmode);
- outmode = newmode;
- }
-
-
- /* these decoders came from graphics.c in the gp parser */
-
-
- /* $PAGE$ */
- /*-----------------------------------------------------------------------*\
- | |
- | Function Name: Mode_0_Graphics |
- | |
- | Description: |
- | |
- | This is the routine that handles a Mode 0 graphics block transfer |
- | to the Formatter Module. |
- | |
- \*-----------------------------------------------------------------------*/
-
- /* FUNCTION */
-
- Mode_0_Graphics(input_bytes, output_bytes, address, invert)
-
- unsigned int
- input_bytes, /* Count of bytes to be read. */
- output_bytes; /* Count of bytes to be stored. */
-
- unsigned char
- *address; /* Pointer to where to store bytes. */
-
- unsigned char /* Boolean to request data inversion */
- invert;
-
- {
- /* LOCAL VARIABLES */
-
- unsigned char
- *store_ptr; /* Pointer to where to store the byte. */
-
- unsigned int
- read_bytes, /* Local copy of input_bytes. */
- write_bytes; /* Local copy of output_bytes. */
-
- /* CODE */
-
- /* Initialize the local variables. */
-
- read_bytes = input_bytes;
- write_bytes = output_bytes;
- store_ptr = address;
-
-
- /* transfer the lesser of available bytes or available room */
-
- if (invert)
- Inv_Transfer_Block( MIN(write_bytes,read_bytes), store_ptr);
- else
- Transfer_Block( MIN(write_bytes,read_bytes), store_ptr);
-
- /* now zero fill or throw excess data away */
-
- if ( read_bytes > write_bytes )
- Discard_Block(read_bytes - write_bytes); /* throw excess */
- else {
- store_ptr += read_bytes; /* adjust pointer */
- write_bytes -= read_bytes; /* zero fill count */
-
- memset(store_ptr, 0, write_bytes);
- }
-
- return ( input_bytes );
- }
-
- /* $PAGE$ */
- /*-----------------------------------------------------------------------*\
- | |
- | Function Name: Mode_1_Graphics |
- | |
- | Description: |
- | |
- | This is the routine that handles a Mode 1 graphics block transfer |
- | to the Formatter Module. Mode 1 graphics is a compacted mode. |
- | The data in Mode 1 is in pairs. The first byte is a replicate |
- | count and the second byte is the data. The data byte is stored |
- | then replicated the replicate count. Therefore a replicate count |
- | of 0 means the data byte is stored once. The input byte count |
- | must be an even amount for the data to be in byte pairs. |
- | |
- \*-----------------------------------------------------------------------*/
-
- /* FUNCTION */
-
- Mode_1_Graphics(input_bytes, output_bytes, address, invert)
-
- unsigned int
- input_bytes, /* Count of bytes to be read. */
- output_bytes; /* Count of bytes to be stored. */
-
- unsigned char
- *address; /* Pointer to where to store bytes. */
-
- unsigned char /* Boolean to request data inversion */
- invert;
-
- {
- /* LOCAL VARIABLES */
-
- unsigned char
- *store_ptr, /* Pointer to where to store the byte. */
- input_char; /* Byte to be replicated. */
-
- unsigned int
- read_bytes, /* Local copy of input_bytes. */
- write_bytes; /* Local copy of output_bytes. */
-
- int
- replicate_count; /* Number of times to replicate data. */
-
- /* CODE */
-
- /* Initialize the local variables. */
-
- read_bytes = input_bytes;
- write_bytes = output_bytes;
- store_ptr = address;
-
- /* Check for an even input count. */
-
- if ((read_bytes % 2) == 0)
- {
- /* Even so input data is in pairs as required. So store the data. */
-
- while ((read_bytes != 0) && (write_bytes != 0))
- {
- /* First get the replicate count and the byte to store. */
-
- replicate_count = (unsigned char) Get_Character();
- input_char = (invert ? ~Get_Character() : Get_Character());
- read_bytes -= 2;
-
- /* Since write_bytes was 0 there is room to store the byte. */
-
- *store_ptr++ = input_char;
- write_bytes--;
-
- /* Now make sure there is room for the replicated data. */
-
- if (replicate_count > write_bytes)
- {
- /* Too much so limit to the room available. */
-
- replicate_count = write_bytes;
- }
-
- /* Update the amount to be written. */
-
- write_bytes -= replicate_count;
-
- /* Then replicate it. */
-
- while (replicate_count != 0)
- {
- /* Store the byte the decrement the count. */
-
- *store_ptr++ = input_char;
-
- replicate_count--;
- }
- }
-
- }
- /* Discard any left over input. */
- /* OR */
- /* Discard all of the input data as odd byte count. */
-
- Discard_Block(read_bytes);
-
- read_bytes = store_ptr - address; /* how much was done? */
-
- /* zero fill if needed */
- memset(store_ptr, 0, write_bytes);
-
- return(read_bytes);
- }
-
- /* $PAGE$ */
- /*-----------------------------------------------------------------------*\
- | |
- | Function Name: Mode_2_Graphics |
- | |
- | Description: |
- | |
- | This is the routine that handles a Mode 2 graphics block transfer |
- | to the Formatter Module. Mode 2 graphics is a compacted mode. |
- | The data in Mode 2 is of one of two types. The first type is a |
- | class type and the second type is a data type. The class type is |
- | a single byte which is a combination of replicate count and a sub |
- | mode. There are two sub modes within mode 2, sub mode 0 and sub |
- | mode 1. These sub modes are flagged by the MSB of the class type |
- | byte. If the MSB = 0 then the replicate count is the value of the |
- | class type byte. In sub mode 0 the replicate count ranges from 1 |
- | to 127. In sub mode 0 the next byte and then the replicate count |
- | of bytes are of the data type and stored. If the MSB = 1 then the |
- | sub mode is 1 and the replicate count is the negative value of the |
- | class type. In sub mode 1 the replicate count is stored in 2s |
- | compliment form and ranges from -1 to -127. In sub mode 1 the |
- | next byte is of the data type and is stored. That data byte is |
- | then replicated and stored the replicate count. If the class type |
- | byte is 128 then there is no data type byte. |
- | |
- \*-----------------------------------------------------------------------*/
-
- /* FUNCTION */
-
- Mode_2_Graphics(input_bytes, output_bytes, address, invert)
-
- unsigned int
- input_bytes, /* Count of bytes to be read. */
- output_bytes; /* Count of bytes to be stored. */
-
- unsigned char
- *address; /* Pointer to where to store bytes. */
-
- unsigned char /* Boolean to request data inversion */
- invert;
-
- {
- /* LOCAL VARIABLES */
-
- unsigned char
- *store_ptr, /* Pointer to where to store the byte. */
- input_char, /* Byte to be replicated. */
- sub_mode; /* Flag if sub mode is 0 or 1. */
-
- unsigned int
- read_bytes, /* Local copy of input_bytes. */
- write_bytes; /* Local copy of output_bytes. */
-
- int
- replicate_count; /* Number of times to replicate data. */
-
- /* CODE */
-
- /* Initialize the local variables. */
-
- read_bytes = input_bytes;
- write_bytes = output_bytes;
- store_ptr = address;
-
- while ((read_bytes > 1) && (write_bytes != 0))
- {
- /* First get the class type byte and the first data type byte. */
-
- replicate_count = Get_Character();
-
- /* First check that this not an ignore class type. */
-
- if (replicate_count != 128)
- {
- /* Not ignore so get the data class byte. */
-
- input_char = (invert ? ~Get_Character() : Get_Character());
- read_bytes -= 2;
-
- /* Since write_bytes wasn't 0 there is room to store the byte. */
-
- *store_ptr++ = input_char;
- write_bytes--;
-
- /* Determine the sub mode. */
-
- if (replicate_count > 128)
- {
- /* Sub mode 1. */
-
- sub_mode = 1;
- /* replicate count was unsigned char */
- replicate_count = 256 - replicate_count;
- }
- else
- {
- /* Sub mode 0. */
-
- sub_mode = 0;
-
- /* See if there is enoungh input left for the data byte count. */
-
- if (replicate_count > read_bytes)
- {
- /* Too many data bytes so limit to the input left. */
-
- replicate_count = read_bytes;
- }
- }
-
- /* Now make sure there is room for the replicated data. */
-
- if (replicate_count > write_bytes)
- {
- /* Too much so limit to the room available. */
-
- replicate_count = write_bytes;
- }
-
- /* Update the amount to be written. */
-
- write_bytes -= replicate_count;
-
- /* Then replicate it. */
-
- if (sub_mode == 0)
- {
- /* Sub mode 0 so get the replicate count of data bytes. */
-
- if (invert)
- Inv_Transfer_Block(replicate_count, store_ptr);
- else
- Transfer_Block(replicate_count, store_ptr);
-
- read_bytes -= replicate_count;
-
- /* Find the last byte stored. */
-
- store_ptr += replicate_count;
- }
- else
- {
- /* Sub mode 1 so just duplicate the original byte. */
-
- while (replicate_count != 0)
- {
- /* Store the byte the decrement the count. */
-
- *store_ptr++ = input_char;
-
- replicate_count--;
- }
- }
- }
- else
- {
- /* Ignore class so don't get the data class byte. */
-
- read_bytes--;
- }
- }
-
- /* Now discard any left over input. */
-
- Discard_Block(read_bytes);
-
- read_bytes = store_ptr - address;
-
- /* zero fill if needed */
- memset(store_ptr, 0, write_bytes);
-
-
- return(read_bytes);
- }
-
- /* $PAGE$ */
- /*-----------------------------------------------------------------------*\
- | |
- | Function Name: Mode_3_Graphics |
- | |
- | Description: |
- | |
- | This is the routine that handles a Mode 3 graphics block transfer |
- | to the Formatter Module. Mode 3 graphics is a compacted mode. |
- | Mode 3 data is a difference from one row to the next. In order to |
- | work, each row must be saved to be a seed for the next. This |
- | mode is used in conjuction with other compaction modes when the |
- | data remains fairly constant between pairs of rows. |
- | The data is in the form: |
- | <command byte>[<optional offset bytes>]<1 to 8 replacement bytes> |
- | The command byte is in the form: |
- | Bits 5-7: Number of bytes to replace (1 - 8) |
- | Bits 0-4: Relative offset from last byte. |
- | (If the offset is 31, then add the following bytes for offset |
- | until an offset byte of less then 255 (but inclusive) |
- | |
- \*-----------------------------------------------------------------------*/
-
- /* FUNCTION */
-
- Mode_3_Graphics(input_bytes, output_bytes, address, invert)
-
- unsigned int
- input_bytes, /* Count of bytes to be read. */
- output_bytes; /* Count of bytes to be stored. */
-
- unsigned char
- *address; /* Pointer to where to store bytes. */
-
- unsigned char /* Boolean to request data inversion */
- invert;
-
- {
- /* LOCAL VARIABLES */
-
- unsigned char
- *store_ptr, /* Pointer to where to store the byte. */
- input_char; /* Byte to be changed. */
-
- unsigned int
- read_bytes, /* Local copy of input_bytes. */
- write_bytes; /* Local copy of output_bytes. */
-
- unsigned int
- replace, /* number of bytes to replace, 1-8 */
- offset; /* relative offset */
-
- #if BITFIELDS
- union comtype {
- unsigned char comchar; /* command byte as char */
- struct btype {
- unsigned repcount:3; /* replace count 1-8 */
- unsigned roff:5; /* relative offset 0-30 */
- } bitf;
- } command;
- #else
- unsigned char command;
- #endif
-
- /* CODE */
-
- /* Initialize the local variables. */
-
- read_bytes = input_bytes;
- write_bytes = output_bytes;
- store_ptr = address;
-
- /* read_bytes has to be at least 2 to be valid */
-
- while ( read_bytes > 1 && write_bytes > 0 ){
-
- /* start by getting the command byte */
-
- read_bytes--;
-
- #if BITFIELDS
- command.comchar = Get_Character();
-
- replace = command.bitf.repcount + 1; /* replace count 1-8 */
-
- offset = command.bitf.roff; /* offset 0-30, 31= extend */
- #else
- command = Get_Character();
- replace = (command >> 5) + 1;
- offset = command & 0x1f;
- #endif
-
- store_ptr += offset;
- write_bytes -= offset;
-
- if ( offset == 31 ) /* get more offsets */
- do{
-
- offset = Get_Character();
-
- read_bytes--;
- if ( read_bytes == 0 ) /* premature finish? */
- return; /* no zero fill wih 3 */
-
- store_ptr += offset;
- write_bytes -= offset;
-
- } while (offset == 255); /* 255 = keep going */
-
- /* now do the byte replacement */
-
- while ( replace-- && write_bytes > 0 && read_bytes > 0 ){
-
- *store_ptr++ = (invert ? ~Get_Character() : Get_Character() );
-
- read_bytes--;
- write_bytes--;
- }
- }
-
- /* don't do any zero fill with mode 3 */
-
- /* discard any leftover input */
-
- Discard_Block(read_bytes);
-
- return( store_ptr - address );
- }
-
-
- Discard_Block(count)
- unsigned int count;
- {
- while ( count-- )
- getchar();
- }
-
- Transfer_Block( count, dest )
- unsigned int count;
- unsigned char *dest;
- {
- fread(dest, 1, count, stdin);
- }
-
- /* this doesn't invert at the moment */
-
- Inv_Transfer_Block( count, dest )
- unsigned int count;
- unsigned char *dest;
- {
- fread(dest, 1, count, stdin);
- }
-
-
- Output_0(src, dest, count)
- unsigned char *src, *dest;
- int count;
- {
- memcpy(dest, src, count);
-
- if ( zerostrip )
- while ( count && dest[count-1] == 0 )
- count--;
-
- return(count);
-
- }
-
- Output_1(src, dest, count)
- unsigned char *src, *dest;
- register int count;
- {
- unsigned char *optr = dest, *iptr;
- int k,c;
-
- if ( zerostrip ) /* strip zeros */
- {
- iptr = src + count - 1; /* point to end of data */
-
- while ( count > 0 && *iptr-- == 0 ) /* hunt thru 0's */
- count--;
- }
-
- iptr = src;
-
- while ( count ){
-
- c = *iptr++; /* get value to work with */
- count--;
-
- k = 0;
-
- while ( *iptr == c && k < 255 && count ){
- k++;
- iptr++;
- count--;
- }
-
- *optr++ = k; /* output repeat count */
- *optr++ = c; /* output value */
- }
-
- count = optr - dest; /* for return value */
-
- return ( count );
- }
-
-
- Output_2(src, dest, count)
- unsigned char *src, *dest;
- register int count;
- {
- unsigned char *optr = dest, *iptr;
- int k,c;
- unsigned char *tptr, *tptr1, *tptr2;
- int tk,tc;
-
-
- if ( zerostrip ) /* strip zeros */
- {
- iptr = src + count - 1; /* point to end of data */
-
- while ( count > 0 && *iptr-- == 0 ) /* hunt thru 0's */
- count--;
- }
-
- iptr = src;
-
- while ( count ){
-
- c = *iptr++; /* get value to work with */
- count--;
-
- k = 0;
-
- while ( *iptr == c && k < 127 && count ){
- k++;
- iptr++;
- count--;
- }
-
- if ( k >= 1 ){
- *optr++ = 256 - k; /* output repeat count */
- *optr++ = c; /* output value */
- } else {
- /* a two byte replicate run will
- * be sent as a repeated byte
- * unless it is preceeded and
- * and followed by a literal run,
- * in which case it is merged
- * into the run.
- */
- tk = 0;
- tc = c;
- tptr = iptr;
- tptr1 = tptr;
- tptr1++;
- tptr2 = tptr1;
- tptr2++;
-
- while ( tk < 128 && (count - tk) > 0 &&
- ((*tptr != tc) || (*tptr == tc &&
- (count - tk - 1) > 0 &&
- *tptr1 != *tptr &&
- *tptr2 != *tptr1))){
-
- tc = *tptr++;
- tk++;
- tptr1++;
- tptr2++;
- }
-
- if ( count && tk )
- tk--;
-
- *optr++ = tk; /* output count */
- *optr++ = c; /* output firstvalue */
-
- while ( tk-- > 0){
- *optr++ = *iptr++;
- count--;
- }
-
- }
- }
-
- count = optr - dest; /* for return value */
-
- return ( count );
- }
-
- Output_3(seed, new, dest, count)
- unsigned char *seed, *new, *dest;
- int count;
- {
- unsigned char *sptr=seed, *nptr=new, *dptr=dest;
- int i,j;
-
-
- #if BITFIELDS
- union comtype {
- unsigned char comchar; /* command byte as char */
- struct btype {
- unsigned repcount:3; /* replace count 1-8 */
- unsigned roff:5; /* relative offset 0-30 */
- } bitf;
- } command;
- #else
- unsigned char command;
- #endif
-
- while ( count > 0 ){
- i = 0;
-
- /* find first diff */
- while ( *sptr == *nptr && i < count ){
- i++;
- sptr++;
- nptr++;
- }
-
- if ( i >= count ) /* too far to find diff */
- return(dptr - dest); /* bail */
-
- count -= i;
-
- /* now count how many bytes to change */
-
- for ( j = 1; j < 8; j++) /* j == 0 is already known */
- if ( j > count || sptr[j] == nptr[j] )
- break;
-
- j--; /* adjust */
-
- #if BITFIELDS
- command.bitf.repcount = j; /* 0-7 ==> 1-8 */
-
- command.bitf.roff = MIN ( i, 31 );
-
- *dptr++ = command.comchar; /* output command */
- #else
- command = (j << 5);
- command += MIN( i, 31 );
- *dptr++ = command;
- #endif
-
- if ( i == 31 )
- *dptr++ = 0;
-
- i -= MIN (i, 31);
-
- while( i ){
- *dptr++ = MIN ( i, 255 );
-
- if ( i == 255 )
- *dptr++ = 0;
-
- i -= MIN ( i, 255 );
- }
-
- while (j-- >= 0){
- *dptr++ = *nptr++;
- sptr++;
- count--;
- }
- }
-
- return ( dptr - dest );
- }
-
-
- /*----------------------------------------------------------------------*\
- * This is here in case <ESC>*rU is sent after <ESC>*r#A, in which case *
- * we must deallocate the memory to provide for a different amount of *
- * planes when graphics are sent. *
- \*----------------------------------------------------------------------*/
-
- free_mem()
- {
- int r;
-
-
- if ( !memflag )
- return; /* no memory to free */
-
- free(new_row);
-
- for(r = MAXMODES -1; r >= 0; r--)
- free(out_row[r]);
-
- for(r = num_planes - 1; r >= 0; r--)
- free(seed_row[r]);
-
- memflag = FALSE;
- }
-