src/tiff/mkspans.c

   1 /* $Header$ */
   2
   3 /*
   4  * Copyright (c) 1991-1997 Sam Leffler
   5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  12  * publicity relating to the software without the specific, prior written
  13  * permission of Sam Leffler and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 #include "tiffcomp.h"
  28
  29 /*
  30  * Hack program to construct tables used to find
  31  * runs of zeros and ones in Group 3 Fax encoding.
  32  */
  33
  34 dumparray(name, runs)
  35         char *name;
  36         unsigned char runs[256];
  37 {
  38         register int i;
  39         register char *sep;
  40         printf("static u_char %s[256] = {\n", name);
  41         sep = "    ";
  42         for (i = 0; i < 256; i++) {
  43                 printf("%s%d", sep, runs[i]);
  44                 if (((i + 1) % 16) == 0) {
  45                         printf(",       /* 0x%02x - 0x%02x */\n", i-15, i);
  46                         sep = "    ";
  47                 } else
  48                         sep = ", ";
  49         }
  50         printf("\n};\n");
  51 }
  52
  53 main()
  54 {
  55         unsigned char runs[2][256];
  56
  57         memset(runs[0], 0, 256*sizeof (char));
  58         memset(runs[1], 0, 256*sizeof (char));
  59         { register int run, runlen, i;
  60           runlen = 1;
  61           for (run = 0x80; run != 0xff; run = (run>>1)|0x80) {
  62                 for (i = run-1; i >= 0; i--) {
  63                         runs[1][run|i] = runlen;
  64                         runs[0][(~(run|i)) & 0xff] = runlen;
  65                 }
  66                 runlen++;
  67           }
  68           runs[1][0xff] = runs[0][0] = 8;
  69         }
  70         dumparray("bruns", runs[0]);
  71         dumparray("wruns", runs[1]);
  72 }