1 /* $Id: mkspans.c,v 1.4 2010-03-10 18:56:48 bfriesen Exp $ */
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 <string.h>
28 #include <stdio.h>
29
30 /*
31 * Hack program to construct tables used to find
32 * runs of zeros and ones in Group 3 Fax encoding.
33 */
34
dumparray(name,runs)35 dumparray(name, runs)
36 char *name;
37 unsigned char runs[256];
38 {
39 int i;
40 char *sep;
41 printf("static unsigned char %s[256] = {\n", name);
42 sep = " ";
43 for (i = 0; i < 256; i++) {
44 printf("%s%d", sep, runs[i]);
45 if (((i + 1) % 16) == 0) {
46 printf(", /* 0x%02x - 0x%02x */\n", i-15, i);
47 sep = " ";
48 } else
49 sep = ", ";
50 }
51 printf("\n};\n");
52 }
53
main()54 main()
55 {
56 unsigned char runs[2][256];
57
58 memset(runs[0], 0, 256*sizeof (char));
59 memset(runs[1], 0, 256*sizeof (char));
60 { register int run, runlen, i;
61 runlen = 1;
62 for (run = 0x80; run != 0xff; run = (run>>1)|0x80) {
63 for (i = run-1; i >= 0; i--) {
64 runs[1][run|i] = runlen;
65 runs[0][(~(run|i)) & 0xff] = runlen;
66 }
67 runlen++;
68 }
69 runs[1][0xff] = runs[0][0] = 8;
70 }
71 dumparray("bruns", runs[0]);
72 dumparray("wruns", runs[1]);
73 }
74
75 /* vim: set ts=8 sts=8 sw=8 noet: */
76 /*
77 * Local Variables:
78 * mode: c
79 * c-basic-offset: 8
80 * fill-column: 78
81 * End:
82 */
83