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+/* $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;
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 21:51:44 +0000