mkspans.c

tiff文件开发库

/* $Header: /cvsroot/osrs/libtiff/libtiff/mkspans.c,v 1.1.1.1 1999/07/27 21:50:27 mike Exp $ */

/*
 * Copyright (c) 1991-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

#include "tiffcomp.h"

/*
 * Hack program to construct tables used to find
 * runs of zeros and ones in Group 3 Fax encoding.
 */

dumparray(name, runs)
	char *name;
	unsigned char runs[256];
{
	register int i;
	register char *sep;
	printf("static u_char %s[256] = {\n", name);
	sep = "    ";
	for (i = 0; i < 256; i++) {
		printf("%s%d", sep, runs[i]);
		if (((i + 1) % 16) == 0) {
			printf(",	/* 0x%02x - 0x%02x */\n", i-15, i);
			sep = "    ";
		} else
			sep = ", ";
	}
	printf("\n};\n");
}

main()
{
	unsigned char runs[2][256];

	memset(runs[0], 0, 256*sizeof (char));
	memset(runs[1], 0, 256*sizeof (char));
	{ register int run, runlen, i;
	  runlen = 1;
	  for (run = 0x80; run != 0xff; run = (run>>1)|0x80) {
		for (i = run-1; i >= 0; i--) {
			runs[1][run|i] = runlen;
			runs[0][(~(run|i)) & 0xff] = runlen;
		}
		runlen++;
	  }
	  runs[1][0xff] = runs[0][0] = 8;
	}
	dumparray("bruns", runs[0]);
	dumparray("wruns", runs[1]);
}