Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 761 insertions, 0 deletions

diff --git a/nx-X11/lib/lbxutil/image/mkg3states.c b/nx-X11/lib/lbxutil/image/mkg3states.c
new file mode 100644
index 000000000..0e8fe3613
--- /dev/null
+++ b/nx-X11/lib/lbxutil/image/mkg3states.c
@@ -0,0 +1,761 @@
+/* $Xorg: mkg3states.c,v 1.3 2000/08/17 19:46:41 cpqbld Exp $ */
+/*
+ * Copyright (c) 1991, 1992 Sam Leffler
+ * Copyright (c) 1991, 1992 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.
+ */
+/* $XFree86: xc/lib/lbxutil/image/mkg3states.c,v 1.3 1999/02/01 11:55:49 dawes Exp $ */
+
+/*
+ * Program to construct Group 3 & Group 4 decoding tables.
+ *
+ * This code is derived from code by Michael P. Marking.  In
+ * particular, the algorithms to generate the null_mode and
+ * horiz_mode state tables are his.  See the comments below
+ * for more information.
+ *
+ * BEGIN (from the original source)
+ LEGAL
+ *	Copyright 1989, 1990 Michael P. Marking, Post Office Box 8039,
+ *	Scottsdale, Arizona 85252-8039. All rights reserved.
+ *
+ *	License is granted by the copyright holder to distribute and use this
+ *	code without payment of royalties or the necessity of notification as
+ *	long as this notice (all the text under "LEGAL") is included.
+ *
+ *	This program is offered without any warranty of any kind. It includes
+ *	no warranty of merchantability or fitness for any purpose. Testing and
+ *	suitability for any use are the sole responsibility of the user.
+ *
+ INFORMATION
+ *	Although there is no support offered with this program, the author will
+ *	endeavor to correct errors. Updates will also be made available from
+ *	time to time.
+ *
+ *	Contact: Michael P. Marking, Post Office Box 8039, Scottsdale, Arizona
+ *	85252-8039 USA. Replies are not guaranteed to be swift. Beginning
+ *	July 1990, e-mail may be sent to uunet!ipel!marking.
+ *
+ *	Also beginning in July 1990, this code will be archived at the
+ *	ipel!phoenix BBS in file g3g4.zoo. The 24-hour telephone number
+ *	for 300/1200/2400 is (602)274-0462. When logging in, specify user
+ *	"public", system "bbs", and password "public".
+ *
+ *	This code is also available from the C Users Group in volume 317.
+ *
+ * END (from the original source)
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#ifndef TRUE
+#define	TRUE	1
+#define	FALSE	0
+#endif
+
+#define WHITE	0
+#define BLACK	1
+
+/*
+ * G3 2D and G4 decoding modes.  Note that
+ * the vertical modes are ordered so that
+ * (mode - MODE_VERT_V0) gives the vertical
+ * adjustment for the b1 parameter.
+ */
+#define MODE_NULL	0
+#define MODE_PASS	1
+#define MODE_HORIZ	2
+#define MODE_VERT_VL3	3
+#define MODE_VERT_VL2	4
+#define MODE_VERT_VL1	5
+#define MODE_VERT_V0	6
+#define MODE_VERT_VR1	7
+#define MODE_VERT_VR2	8
+#define MODE_VERT_VR3	9
+#define MODE_UNCOMP	10
+#define MODE_ERROR	11
+#define MODE_ERROR_1	12
+
+unsigned long append_0 ( unsigned long prefix );
+unsigned long append_1 ( unsigned long prefix );
+
+unsigned long append_0 (unsigned long prefix)
+{
+    return (prefix + (1L<<16));
+}
+
+unsigned long append_1 (unsigned long prefix)
+{
+    static unsigned short prefix_bit[16] = {
+	0x8000, 0x4000, 0x2000, 0x1000,
+	0x0800, 0x0400, 0x0200, 0x0100,
+	0x0080, 0x0040, 0x0020, 0x0010,
+	0x0008, 0x0004, 0x0002, 0x0001
+    };
+    unsigned char len = (prefix >> 16) & 0xf;
+    return (append_0(prefix) + prefix_bit[len]);
+}
+
+#define	G3CODES
+#include "lbxfax.h"
+#include "lbxbwcodes.h"
+
+short search_table ( unsigned long prefix, tableentry *tab, int n );
+short white_run_length ( unsigned long prefix );
+short black_run_length ( unsigned long prefix );
+short horiz_mode_code_black ( short runlen );
+short horiz_mode_code_white ( short runlen );
+void write_define ( FILE *fd, char *name, int value, char *comment );
+void write_preamble ( FILE *fd );
+void extern_table ( FILE *fd, char *name );
+void write_tables ( FILE *fd );
+short find_null_mode_prefix ( long prefix );
+short find_horiz_mode_prefix ( long prefix, int color );
+short find_uncomp_mode_prefix ( long prefix );
+short null_mode_type ( long prefix );
+short uncomp_mode_type ( long prefix );
+void build_null_mode_tables ( void );
+void build_horiz_mode_tables ( void );
+void build_uncomp_mode_tables ( void );
+
+short search_table (unsigned long prefix, tableentry *tab, int n)
+{
+    unsigned short len = (prefix >> 16) & 0xf;
+    unsigned short code = (prefix & 0xffff) >> (16 - len);
+
+    while (n-- > 0) {
+	if (tab->length == len && tab->code == code)
+	    return ((short) tab->runlen);
+	tab++;
+    }
+    return (G3CODE_INCOMP);
+}
+
+#define	NCODES(a)	(sizeof (a) / sizeof (a[0]))
+short white_run_length (unsigned long prefix)
+{
+    return (search_table(prefix, TIFFFaxWhiteCodes, NCODES(TIFFFaxWhiteCodes)));
+}
+
+short black_run_length (unsigned long prefix)
+{
+    return (search_table(prefix, TIFFFaxBlackCodes, NCODES(TIFFFaxBlackCodes)));
+}
+#undef NCODES
+
+#define MAX_NULLPREFIX	200	/* max # of null-mode prefixes */
+typedef	unsigned char NullModeTable[MAX_NULLPREFIX][256];
+#define MAX_HORIZPREFIX	250	/* max # of incomplete 1-D prefixes */
+typedef	unsigned char HorizModeTable[MAX_HORIZPREFIX][256];
+
+  /* the bit string corresponding to this row of the decoding table */
+long	null_mode_prefix[MAX_NULLPREFIX];
+NullModeTable null_mode;		/* MODE_*, indexed by bit and byte */
+NullModeTable null_mode_next_state;	/* next row of decoding tables to use */
+  /* number of prefixes or rows in the G4 decoding tables */
+short	null_mode_prefix_count = 0;
+
+void write_null_mode_table ( FILE *fd, NullModeTable table, char *name );
+void write_horiz_mode_table ( FILE *fd, HorizModeTable table, char *name );
+
+/*
+ * 2D uncompressed mode codes.  Note
+ * that two groups of codes are arranged
+ * so that the decoder can caluclate the
+ * length of the run by subtracting the
+ * code from a known base value.
+ */
+#define	UNCOMP_INCOMP	0
+/* runs of [0]*1 */
+#define	UNCOMP_RUN0	1
+#define	UNCOMP_RUN1	2
+#define	UNCOMP_RUN2	3
+#define	UNCOMP_RUN3	4
+#define	UNCOMP_RUN4	5
+#define	UNCOMP_RUN5	6
+#define	UNCOMP_RUN6	7
+/* runs of [0]* w/ terminating color */
+#define	UNCOMP_TRUN0	8
+#define	UNCOMP_TRUN1	9
+#define	UNCOMP_TRUN2	10
+#define	UNCOMP_TRUN3	11
+#define	UNCOMP_TRUN4	12
+/* special code for unexpected EOF */
+#define	UNCOMP_EOF	13
+/* invalid code encountered */
+#define	UNCOMP_INVALID	14
+
+long	uncomp_mode_prefix[MAX_NULLPREFIX];
+NullModeTable uncomp_mode;
+NullModeTable uncomp_mode_next_state;
+short	uncomp_mode_prefix_count = 0;
+
+/*
+ * Decoding action values for horiz_mode.
+ */
+#define ACT_INCOMP	0		/* incompletely decoded code */
+#define ACT_INVALID	1		/* invalide code */
+#define	ACT_WRUNT	2		/* terminating white run code */
+#define	ACT_WRUN	65		/* non-terminating white run code */
+#define	ACT_BRUNT	106		/* terminating black run code */
+#define	ACT_BRUN	169		/* non-terminating black run code */
+#define ACT_EOL		210		/* end-of-line code */
+HorizModeTable horiz_mode;
+
+short horiz_mode_code_black (short runlen)
+{
+    return (runlen < 64 ? runlen + ACT_BRUNT : (runlen / 64) + ACT_BRUN);
+}
+
+short horiz_mode_code_white (short runlen)
+{
+    return (runlen < 64 ? runlen + ACT_WRUNT : (runlen / 64) + ACT_WRUN);
+}
+
+/*
+ * If the corresponding horiz_mode entry is ACT_INCOMP
+ * this entry is a row number for decoding the next byte;
+ * otherwise, it is the bit number with which to continue
+ * decoding the next codeword.
+ */
+HorizModeTable horiz_mode_next_state;
+		/* prefixes corresponding to the rows of the decoding table */
+long	horiz_mode_prefix[MAX_HORIZPREFIX];
+		/* color of next run, BLACK or WHITE */
+char	horiz_mode_color[MAX_HORIZPREFIX];
+short	horiz_mode_prefix_count = 0;
+
+static	unsigned char bit_mask[8] =
+    { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
+
+
+int	verbose = FALSE;
+char	*storage_class = "";
+
+int
+main (int argc, char *argv[])
+{
+    while (argc > 1 && argv[1][0] == '-') {
+	if (strcmp(argv[1], "-v") == 0) {
+	    verbose = TRUE;
+	    argc--, argv++;
+	} else if (strcmp(argv[1], "-c") == 0) {
+	    storage_class = "const ";
+	    argc--, argv++;
+	}
+    }
+    build_null_mode_tables();		/* null mode decoding tables */
+    if (verbose) {
+	fprintf(stderr, "%d null mode prefixes defined\n",
+	    (int) null_mode_prefix_count);
+	fprintf(stderr, "building uncompressed mode scripts...\n");
+    }
+    build_uncomp_mode_tables();		/* uncompressed mode decoding tables */
+    if (verbose) {
+	fprintf(stderr, "%d uncompressed mode prefixes defined\n",
+	    (int) uncomp_mode_prefix_count);
+	fprintf(stderr, "building 1D scripts...\n");
+    }
+    build_horiz_mode_tables();		/* 1D decoding tables */
+    if (verbose)
+	fprintf(stderr, "%d incomplete prefixes defined\n",
+	    (int) horiz_mode_prefix_count);
+    write_tables(stdout);
+    exit(0);
+}
+
+void write_null_mode_table (fd, table, name)
+FILE *fd;
+NullModeTable table;
+char *name;
+{
+    int i, j;
+    char* outersep;
+    char* sep;
+
+    fprintf(fd, "%sunsigned char\t%s[%d][256] = {", storage_class,
+	name, (int) null_mode_prefix_count);
+    outersep = "";
+    for (i = 0; i < null_mode_prefix_count; i++) {
+	fprintf(fd, "%s\n/* prefix %d */ {\n", outersep, i);
+	sep = "    ";
+	for (j = 0; j < 256; j++) {
+	    fprintf(fd, "%s%2d", sep, (int) table[i][j]);
+	    if (((j+1) % 16) == 0) {
+		fprintf(fd, ", /* %3d-%3d */\n", j-15, j);
+		sep = "    ";
+	    } else
+		sep = ",";
+	}
+	fprintf(fd, "}");
+	outersep = ",";
+    }
+    fprintf(fd, "\n};\n");
+}
+
+void 
+write_horiz_mode_table (FILE *fd, HorizModeTable table, char *name)
+{
+    int i, j;
+    char* outersep;
+    char* sep;
+
+    fprintf(fd, "%s unsigned char\t%s[%d][256] = {", storage_class,
+	name, (int) horiz_mode_prefix_count);
+    outersep = "";
+    for (i = 0; i < horiz_mode_prefix_count; i++) {
+	fprintf(fd, "%s\n/* prefix %d */ {\n", outersep, i);
+	sep = "    ";
+	for (j = 0; j < 256; j++) {
+	    fprintf(fd, "%s%3d", sep, (int) table[i][j]);
+	    if (((j+1) % 14) == 0) {
+		fprintf(fd, ", /* %3d-%3d */\n", j-13, j);
+		sep = "    ";
+	    } else
+		sep = ",";
+	}
+	fprintf(fd, "\n}");
+	outersep = ",";
+    }
+    fprintf(fd, "\n};\n");
+}
+
+void
+write_define(FILE *fd, char *name, int value, char *comment)
+{
+    fprintf(fd, "#define\t%s\t%d", name, value);
+    if (comment)
+	fprintf(fd, "\t/* %s */", comment);
+    fprintf(fd, "\n");
+}
+
+void
+write_preamble(FILE *fd)
+{
+    fprintf(fd, "%s\n",
+"/* DO NOT EDIT THIS FILE, IT WAS AUTOMATICALLY CREATED BY mkg3state */");
+    write_define(fd, "ACT_INCOMP", ACT_INCOMP, "incompletely decoded code");
+    write_define(fd, "ACT_INVALID", ACT_INVALID, "invalide code");
+    write_define(fd, "ACT_WRUNT", ACT_WRUNT, "terminating white run code");
+    write_define(fd, "ACT_WRUN", ACT_WRUN, "non-terminating white run code");
+    write_define(fd, "ACT_BRUNT", ACT_BRUNT, "terminating black run code");
+    write_define(fd, "ACT_BRUN", ACT_BRUN, "non-terminating black run code");
+    write_define(fd, "ACT_EOL", ACT_EOL, "end-of-line code");
+    fprintf(fd, "\n");
+    fprintf(fd, "/* modes that the decoder can be in */\n");
+    write_define(fd, "MODE_NULL", MODE_NULL, NULL);
+    write_define(fd, "MODE_PASS", MODE_PASS, NULL);
+    write_define(fd, "MODE_HORIZ", MODE_HORIZ, NULL);
+    write_define(fd, "MODE_VERT_V0", MODE_VERT_V0, NULL);
+    write_define(fd, "MODE_VERT_VR1", MODE_VERT_VR1, NULL);
+    write_define(fd, "MODE_VERT_VR2", MODE_VERT_VR2, NULL);
+    write_define(fd, "MODE_VERT_VR3", MODE_VERT_VR3, NULL);
+    write_define(fd, "MODE_VERT_VL1", MODE_VERT_VL1, NULL);
+    write_define(fd, "MODE_VERT_VL2", MODE_VERT_VL2, NULL);
+    write_define(fd, "MODE_VERT_VL3", MODE_VERT_VL3, NULL);
+    write_define(fd, "MODE_UNCOMP", MODE_UNCOMP, NULL);
+    write_define(fd, "MODE_ERROR", MODE_ERROR, NULL);
+    write_define(fd, "MODE_ERROR_1", MODE_ERROR_1, NULL);
+    fprintf(fd, "\n");
+    fprintf(fd, "#define\tRUNLENGTH(ix)	(TIFFFaxWhiteCodes[ix].runlen)\n");
+    fprintf(fd, "\n");
+    write_define(fd, "UNCOMP_INCOMP", UNCOMP_INCOMP, NULL);
+    fprintf(fd, "/* runs of [0]*1 */\n");
+    write_define(fd, "UNCOMP_RUN0", UNCOMP_RUN0, NULL);
+    write_define(fd, "UNCOMP_RUN1", UNCOMP_RUN1, NULL);
+    write_define(fd, "UNCOMP_RUN2", UNCOMP_RUN2, NULL);
+    write_define(fd, "UNCOMP_RUN3", UNCOMP_RUN3, NULL);
+    write_define(fd, "UNCOMP_RUN4", UNCOMP_RUN4, NULL);
+    write_define(fd, "UNCOMP_RUN5", UNCOMP_RUN5, NULL);
+    write_define(fd, "UNCOMP_RUN6", UNCOMP_RUN6, NULL);
+    fprintf(fd, "/* runs of [0]* w/ terminating color */\n");
+    write_define(fd, "UNCOMP_TRUN0", UNCOMP_TRUN0, NULL);
+    write_define(fd, "UNCOMP_TRUN1", UNCOMP_TRUN1, NULL);
+    write_define(fd, "UNCOMP_TRUN2", UNCOMP_TRUN2, NULL);
+    write_define(fd, "UNCOMP_TRUN3", UNCOMP_TRUN3, NULL);
+    write_define(fd, "UNCOMP_TRUN4", UNCOMP_TRUN4, NULL);
+    fprintf(fd, "/* special code for unexpected EOF */\n");
+    write_define(fd, "UNCOMP_EOF", UNCOMP_EOF, NULL);
+    fprintf(fd, "/* invalid code encountered */\n");
+    write_define(fd, "UNCOMP_INVALID", UNCOMP_INVALID, NULL);
+    fprintf(fd, "/* codes >= terminate uncompress mode */\n");
+    fprintf(fd, "#define\tUNCOMP_EXIT	UNCOMP_TRUN0\n");
+    fprintf(fd, "\n");
+}
+
+void
+extern_table(FILE *fd, char *name)
+{
+    fprintf(fd, "extern\t%sunsigned char %s[][256];\n", storage_class, name);
+}
+
+void
+write_tables(FILE *fd)
+{
+    write_preamble(fd);
+    write_null_mode_table(fd, null_mode, "TIFFFax2DMode");
+    write_null_mode_table(fd, null_mode_next_state, "TIFFFax2DNextState");
+    write_null_mode_table(fd, uncomp_mode, "TIFFFaxUncompAction");
+    write_null_mode_table(fd, uncomp_mode_next_state, "TIFFFaxUncompNextState");
+    write_horiz_mode_table(fd, horiz_mode, "TIFFFax1DAction");
+    write_horiz_mode_table(fd, horiz_mode_next_state, "TIFFFax1DNextState");
+}
+
+short 
+find_null_mode_prefix (long prefix)
+{
+    short j1;
+
+    if (prefix == 0L)
+	return (0);
+    for (j1 = 8; j1 < null_mode_prefix_count; j1++)
+	if (prefix == null_mode_prefix[j1])
+		return (j1);
+    if (null_mode_prefix_count == MAX_NULLPREFIX) {
+	fprintf(stderr, "ERROR: null mode prefix table overflow\n");
+	exit(1);
+    }
+    if (verbose)
+	fprintf(stderr, "adding null mode prefix[%d] 0x%lx\n",
+	    (int) null_mode_prefix_count, prefix);
+    null_mode_prefix[null_mode_prefix_count++] = prefix;
+    return (null_mode_prefix_count-1);
+}
+
+short 
+find_horiz_mode_prefix (long prefix, int color)
+{
+    short j1;
+
+    for (j1 = 0; j1 < horiz_mode_prefix_count; j1++)
+	if (prefix == horiz_mode_prefix[j1] && horiz_mode_color[j1] == color)
+	    return (j1);
+    /*
+     * It wasn't found, so add it to the tables, but first, is there room?
+     */
+    if (horiz_mode_prefix_count == MAX_HORIZPREFIX) {
+	fprintf(stderr, "ERROR: 1D prefix table overflow\n");
+	exit(1);
+    }
+    /* OK, there's room... */
+    if (verbose)
+	fprintf(stderr, "\nhoriz mode prefix %d, color %c = 0x%lx ",
+	    (int) horiz_mode_prefix_count, "WB"[color], prefix);
+    horiz_mode_prefix[horiz_mode_prefix_count] = prefix;
+    horiz_mode_color[horiz_mode_prefix_count] = color;
+    horiz_mode_prefix_count++;
+    return (horiz_mode_prefix_count - 1);
+}
+
+short 
+find_uncomp_mode_prefix (long prefix)
+{
+    short j1;
+
+    if (prefix == 0L)
+	return (0);
+    for (j1 = 8; j1 < uncomp_mode_prefix_count; j1++)
+	if (prefix == uncomp_mode_prefix[j1])
+		return (j1);
+    if (uncomp_mode_prefix_count == MAX_NULLPREFIX) {
+	fprintf(stderr, "ERROR: uncomp mode prefix table overflow\n");
+	exit(1);
+    }
+    if (verbose)
+	fprintf(stderr, "adding uncomp mode prefix[%d] 0x%lx\n",
+	    (int) uncomp_mode_prefix_count, prefix);
+    uncomp_mode_prefix[uncomp_mode_prefix_count++] = prefix;
+    return (uncomp_mode_prefix_count-1);
+}
+
+short 
+null_mode_type (long prefix)
+{
+    switch (prefix) {
+    case 0x18000L: return (MODE_VERT_V0);	/* 1 */
+    case 0x36000L: return (MODE_VERT_VR1);	/* 011 */
+    case 0x34000L: return (MODE_VERT_VL1);	/* 010 */
+    case 0x32000L: return (MODE_HORIZ);		/* 001 */
+    case 0x41000L: return (MODE_PASS);		/* 0001 */
+    case 0x60C00L: return (MODE_VERT_VR2);	/* 0000 11 */
+    case 0x60800L: return (MODE_VERT_VL2);	/* 0000 10 */
+    case 0x70600L: return (MODE_VERT_VR3);	/* 0000 011 */
+    case 0x70400L: return (MODE_VERT_VL3);	/* 0000 010 */
+    case 0x80200L: return (MODE_ERROR);		/* 0000 0010 */
+    case 0x90300L: return (MODE_ERROR);		/* 0000 0011 0 */
+    case 0xA0380L: return (MODE_ERROR);		/* 0000 0011 10 */
+    case 0xA03C0L: return (MODE_UNCOMP);	/* 0000 0011 11 */
+    /*
+     * Under the assumption that there are no
+     * errors in the file, then this bit string
+     * can only be the beginning of an EOL code.
+     */
+    case 0x70000L: return (MODE_ERROR_1);	/* 0000 000 */
+    }
+    return (-1);
+}
+
+short 
+uncomp_mode_type (long prefix)
+{
+    short code;
+    short len;
+    switch (prefix) {
+    case 0x18000L: return (UNCOMP_RUN1);	/* 1 */
+    case 0x24000L: return (UNCOMP_RUN2);	/* 01 */
+    case 0x32000L: return (UNCOMP_RUN3);	/* 001 */
+    case 0x41000L: return (UNCOMP_RUN4);	/* 0001 */
+    case 0x50800L: return (UNCOMP_RUN5);	/* 0000 1 */
+    case 0x60400L: return (UNCOMP_RUN6);	/* 0000 01 */
+    case 0x70200L: return (UNCOMP_TRUN0);	/* 0000 001 */
+    case 0x80100L: return (UNCOMP_TRUN1);	/* 0000 0001 */
+    case 0x90080L: return (UNCOMP_TRUN2);	/* 0000 0000 1 */
+    case 0xA0040L: return (UNCOMP_TRUN3);	/* 0000 0000 01 */
+    case 0xB0020L: return (UNCOMP_TRUN4);	/* 0000 0000 001 */
+    }
+    code = prefix & 0xffffL;
+    len = (prefix >> 16) & 0xf;
+    return ((code || len > 10) ? UNCOMP_INVALID : -1);
+}
+
+#define	BASESTATE(b)	((unsigned char) ((b) & 0x7))
+
+void
+build_null_mode_tables(void)
+{
+    short prefix;
+
+    /*
+     * Note: the first eight entries correspond to
+     * a null prefix and starting bit numbers 0-7.
+     */
+    null_mode_prefix_count = 8;
+    for (prefix = 0; prefix < null_mode_prefix_count; prefix++) {
+	short byte;
+	for (byte = 0; byte < 256; byte++) {
+	    short firstbit;
+	    short bit;
+	    long curprefix;
+	    char found_code = FALSE;
+
+	    if (prefix < 8) {
+		curprefix = 0L;
+		firstbit = prefix;
+	    } else {
+		curprefix = null_mode_prefix[prefix];
+		firstbit = 0;
+	    }
+	    for (bit = firstbit; bit < 8 && !found_code; bit++) {
+		short mode;
+
+		if (bit_mask[bit] & byte)
+		    curprefix = append_1(curprefix);
+		else
+		    curprefix = append_0(curprefix);
+		switch (mode = null_mode_type(curprefix)) {
+		case MODE_PASS:
+		case MODE_HORIZ:
+		case MODE_VERT_V0:
+		case MODE_VERT_VR1:
+		case MODE_VERT_VR2:
+		case MODE_VERT_VR3:
+		case MODE_VERT_VL1:
+		case MODE_VERT_VL2:
+		case MODE_VERT_VL3:
+		case MODE_UNCOMP:
+		case MODE_ERROR:
+		case MODE_ERROR_1:
+		    /*
+		     * NOTE: if the bit number is 8, then the table
+		     * entry will be zero, which indicates a new byte
+		     * is to be fetched during the decoding process
+		     */
+		    found_code = TRUE;
+		    null_mode[prefix][byte] = (unsigned char) mode;
+		    null_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+		    break;
+		}
+	    }
+	    if (!found_code) {
+		null_mode_next_state[prefix][byte] = (unsigned char)
+		    find_null_mode_prefix(curprefix);
+		/*
+		 * This indicates to the decoder that
+		 * no valid code has yet been identified.
+		 */
+		null_mode[prefix][byte] = MODE_NULL;
+	    }
+	}
+    }
+}
+
+void
+build_horiz_mode_tables(void)
+{
+    unsigned short byte;
+    short prefix;
+
+    /*
+     * The first 8 are for white,
+     * the second 8 are for black,
+     * beginning with bits 0-7.
+     */
+    horiz_mode_prefix_count = 16;
+    for (prefix = 0; prefix < horiz_mode_prefix_count; prefix++)
+	for (byte = 0; byte < 256; byte++) {
+	    short bits_digested = 0;
+	    short bit;
+	    short firstbit;
+	    char color;
+	    unsigned long curprefix;
+
+	    if (prefix < 8) {
+		color = WHITE;
+		curprefix = 0L;
+		firstbit = prefix;
+	    } else if (prefix < 16) {
+		color = BLACK;
+		curprefix = 0L;
+		firstbit = prefix - 8;
+	    } else {
+		color = horiz_mode_color[prefix];
+		curprefix = horiz_mode_prefix[prefix];
+		firstbit = 0;
+	    }
+	    for (bit = firstbit; bit < 8 && !bits_digested; bit++) {
+		if (bit_mask[bit] & byte)
+		    curprefix = append_1(curprefix);
+		else
+		    curprefix = append_0(curprefix);
+		/*
+		 * The following conversion allows for arbitrary strings of
+		 * zeroes to precede the end-of-line code 0000 0000 0001.
+		 * It assumes no errors in the data, and is based on
+		 * the assumption that the code replaced (12 consecutive
+		 * zeroes) can only be "legally" encountered before the
+		 * end-of-line code.  This assumption is valid only for
+		 * a Group 3 image; the combination will never occur
+		 * in horizontal mode in a proper Group 4 image.
+		 */
+		if (curprefix == 0xC0000L)
+		    curprefix = 0xB0000L;
+		if (color == WHITE) {
+		    short runlength = white_run_length(curprefix);
+
+		    if (runlength == G3CODE_INVALID) {
+			horiz_mode[prefix][byte] = (unsigned char) ACT_INVALID;
+			horiz_mode_next_state[prefix][byte] = (unsigned char) bit;
+			bits_digested = bit + 1;
+		    } else if (runlength == G3CODE_EOL) { /* Group 3 only */
+			horiz_mode[prefix][byte] = (unsigned char) ACT_EOL;
+			horiz_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+			bits_digested = bit + 1;
+		    } else if (runlength != G3CODE_INCOMP) {
+			horiz_mode[prefix][byte] = (unsigned char)
+			    horiz_mode_code_white(runlength);
+			horiz_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+			bits_digested = bit + 1;
+		    }
+		} else {		/* color == BLACK */
+		    short runlength = black_run_length(curprefix);
+
+		    if (runlength == G3CODE_INVALID) {
+			horiz_mode[prefix][byte] = (unsigned char) ACT_INVALID;
+			horiz_mode_next_state[prefix][byte] = (unsigned char) (bit+8);
+			bits_digested = bit + 1;
+		    } else if (runlength == G3CODE_EOL) { /* Group 3 only */
+			horiz_mode[prefix][byte] = (unsigned char) ACT_EOL;
+			horiz_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+			bits_digested = bit + 1;
+		    } else if (runlength != G3CODE_INCOMP) {
+			horiz_mode[prefix][byte] = (unsigned char)
+			    horiz_mode_code_black(runlength);
+			horiz_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+			bits_digested = bit + 1;
+		    }
+		}
+	    }
+	    if (!bits_digested) {	/* no codewords after examining byte */
+		horiz_mode[prefix][byte] = (unsigned char) ACT_INCOMP;
+		horiz_mode_next_state[prefix][byte] = (unsigned char)
+		    find_horiz_mode_prefix(curprefix, color);
+	    }
+	}
+}
+
+void
+build_uncomp_mode_tables(void)
+{
+    short prefix;
+
+    /*
+     * Note: the first eight entries correspond to
+     * a null prefix and starting bit numbers 0-7.
+     */
+    uncomp_mode_prefix_count = 8;
+    for (prefix = 0; prefix < uncomp_mode_prefix_count; prefix++) {
+	short byte;
+	for (byte = 0; byte < 256; byte++) {
+	    short firstbit;
+	    short bit;
+	    long curprefix;
+	    char found_code = FALSE;
+
+	    if (prefix < 8) {
+		curprefix = 0L;
+		firstbit = prefix;
+	    } else {
+		curprefix = uncomp_mode_prefix[prefix];
+		firstbit = 0;
+	    }
+	    for (bit = firstbit; bit < 8 && !found_code; bit++) {
+		short mode;
+
+		if (bit_mask[bit] & byte)
+		    curprefix = append_1(curprefix);
+		else
+		    curprefix = append_0(curprefix);
+		mode = uncomp_mode_type(curprefix);
+		if (mode != -1) {
+		    /*
+		     * NOTE: if the bit number is 8, then the table
+		     * entry will be zero, which indicates a new byte
+		     * is to be fetched during the decoding process
+		     */
+		    found_code = TRUE;
+		    uncomp_mode[prefix][byte] = (unsigned char) mode;
+		    uncomp_mode_next_state[prefix][byte] = BASESTATE(bit+1);
+		    break;
+		}
+	    }
+	    if (!found_code) {
+		uncomp_mode_next_state[prefix][byte] = (unsigned char)
+		    find_uncomp_mode_prefix(curprefix);
+		/*
+		 * This indicates to the decoder that
+		 * no valid code has yet been identified.
+		 */
+		uncomp_mode[prefix][byte] = UNCOMP_INCOMP;
+	    }
+	}
+    }
+}