faxinit.c

涉及Fax/Mail/Voice通讯编程的一个程序

/* Initialise fax decoder tables
   Copyright (C) 1990, 1995  Frank D. Cringle.

This file is part of viewfax - g3/g4 fax processing software.
     
viewfax is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
     
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
     
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

#include <sys/types.h>
#include "faxexpand.h"

struct tabent MainTable[128];
struct tabent WhiteTable[4096];
struct tabent BlackTable[8192];

struct proto {
    t16bits code;		/* right justified, lsb-first, zero filled */
    t16bits val;		/* (pixel count)<<4 + code width  */
};

static struct proto Pass[] = {
{ 0x0008, 4 },
{ 0, 0 }
};

static struct proto Horiz[]  = {
{ 0x0004, 3 },
{ 0, 0 }
};

static struct proto V0[]  = {
{ 0x0001, 1 },
{ 0, 0 }
};

static struct proto VR[]  = {
{ 0x0006, (1<<4)+3 },
{ 0x0030, (2<<4)+6 },
{ 0x0060, (3<<4)+7 },
{ 0, 0 }
};

static struct proto VL[]  = {
{ 0x0002, (1<<4)+3 },
{ 0x0010, (2<<4)+6 },
{ 0x0020, (3<<4)+7 },
{ 0, 0 }
};

static struct proto ExtV[]  = {
{ 0x0040, 7 },
{ 0, 0 }
};

static struct proto EOLV[]  = {
{ 0x0000, 7 },
{ 0, 0 }
};

static struct proto MakeUpW[] = {
{ 0x001b, 1029 },
{ 0x0009, 2053 },
{ 0x003a, 3078 },
{ 0x0076, 4103 },
{ 0x006c, 5128 },
{ 0x00ec, 6152 },
{ 0x0026, 7176 },
{ 0x00a6, 8200 },
{ 0x0016, 9224 },
{ 0x00e6, 10248 },
{ 0x0066, 11273 },
{ 0x0166, 12297 },
{ 0x0096, 13321 },
{ 0x0196, 14345 },
{ 0x0056, 15369 },
{ 0x0156, 16393 },
{ 0x00d6, 17417 },
{ 0x01d6, 18441 },
{ 0x0036, 19465 },
{ 0x0136, 20489 },
{ 0x00b6, 21513 },
{ 0x01b6, 22537 },
{ 0x0032, 23561 },
{ 0x0132, 24585 },
{ 0x00b2, 25609 },
{ 0x0006, 26630 },
{ 0x01b2, 27657 },
{ 0, 0 }
};

static struct proto MakeUpB[] = {
{ 0x03c0, 1034 },
{ 0x0130, 2060 },
{ 0x0930, 3084 },
{ 0x0da0, 4108 },
{ 0x0cc0, 5132 },
{ 0x02c0, 6156 },
{ 0x0ac0, 7180 },
{ 0x06c0, 8205 },
{ 0x16c0, 9229 },
{ 0x0a40, 10253 },
{ 0x1a40, 11277 },
{ 0x0640, 12301 },
{ 0x1640, 13325 },
{ 0x09c0, 14349 },
{ 0x19c0, 15373 },
{ 0x05c0, 16397 },
{ 0x15c0, 17421 },
{ 0x0dc0, 18445 },
{ 0x1dc0, 19469 },
{ 0x0940, 20493 },
{ 0x1940, 21517 },
{ 0x0540, 22541 },
{ 0x1540, 23565 },
{ 0x0b40, 24589 },
{ 0x1b40, 25613 },
{ 0x04c0, 26637 },
{ 0x14c0, 27661 },
{ 0, 0 }
};

static struct proto MakeUp[] = {
{ 0x0080, 28683 },
{ 0x0180, 29707 },
{ 0x0580, 30731 },
{ 0x0480, 31756 },
{ 0x0c80, 32780 },
{ 0x0280, 33804 },
{ 0x0a80, 34828 },
{ 0x0680, 35852 },
{ 0x0e80, 36876 },
{ 0x0380, 37900 },
{ 0x0b80, 38924 },
{ 0x0780, 39948 },
{ 0x0f80, 40972 },
{ 0, 0 }
};

static struct proto TermW[] = {
{ 0x00ac, 8 },
{ 0x0038, 22 },
{ 0x000e, 36 },
{ 0x0001, 52 },
{ 0x000d, 68 },
{ 0x0003, 84 },
{ 0x0007, 100 },
{ 0x000f, 116 },
{ 0x0019, 133 },
{ 0x0005, 149 },
{ 0x001c, 165 },
{ 0x0002, 181 },
{ 0x0004, 198 },
{ 0x0030, 214 },
{ 0x000b, 230 },
{ 0x002b, 246 },
{ 0x0015, 262 },
{ 0x0035, 278 },
{ 0x0072, 295 },
{ 0x0018, 311 },
{ 0x0008, 327 },
{ 0x0074, 343 },
{ 0x0060, 359 },
{ 0x0010, 375 },
{ 0x000a, 391 },
{ 0x006a, 407 },
{ 0x0064, 423 },
{ 0x0012, 439 },
{ 0x000c, 455 },
{ 0x0040, 472 },
{ 0x00c0, 488 },
{ 0x0058, 504 },
{ 0x00d8, 520 },
{ 0x0048, 536 },
{ 0x00c8, 552 },
{ 0x0028, 568 },
{ 0x00a8, 584 },
{ 0x0068, 600 },
{ 0x00e8, 616 },
{ 0x0014, 632 },
{ 0x0094, 648 },
{ 0x0054, 664 },
{ 0x00d4, 680 },
{ 0x0034, 696 },
{ 0x00b4, 712 },
{ 0x0020, 728 },
{ 0x00a0, 744 },
{ 0x0050, 760 },
{ 0x00d0, 776 },
{ 0x004a, 792 },
{ 0x00ca, 808 },
{ 0x002a, 824 },
{ 0x00aa, 840 },
{ 0x0024, 856 },
{ 0x00a4, 872 },
{ 0x001a, 888 },
{ 0x009a, 904 },
{ 0x005a, 920 },
{ 0x00da, 936 },
{ 0x0052, 952 },
{ 0x00d2, 968 },
{ 0x004c, 984 },
{ 0x00cc, 1000 },
{ 0x002c, 1016 },
{ 0, 0 }
};

static struct proto TermB[] = {
{ 0x03b0, 10 },
{ 0x0002, 19 },
{ 0x0003, 34 },
{ 0x0001, 50 },
{ 0x0006, 67 },
{ 0x000c, 84 },
{ 0x0004, 100 },
{ 0x0018, 117 },
{ 0x0028, 134 },
{ 0x0008, 150 },
{ 0x0010, 167 },
{ 0x0050, 183 },
{ 0x0070, 199 },
{ 0x0020, 216 },
{ 0x00e0, 232 },
{ 0x0030, 249 },
{ 0x03a0, 266 },
{ 0x0060, 282 },
{ 0x0040, 298 },
{ 0x0730, 315 },
{ 0x00b0, 331 },
{ 0x01b0, 347 },
{ 0x0760, 363 },
{ 0x00a0, 379 },
{ 0x0740, 395 },
{ 0x00c0, 411 },
{ 0x0530, 428 },
{ 0x0d30, 444 },
{ 0x0330, 460 },
{ 0x0b30, 476 },
{ 0x0160, 492 },
{ 0x0960, 508 },
{ 0x0560, 524 },
{ 0x0d60, 540 },
{ 0x04b0, 556 },
{ 0x0cb0, 572 },
{ 0x02b0, 588 },
{ 0x0ab0, 604 },
{ 0x06b0, 620 },
{ 0x0eb0, 636 },
{ 0x0360, 652 },
{ 0x0b60, 668 },
{ 0x05b0, 684 },
{ 0x0db0, 700 },
{ 0x02a0, 716 },
{ 0x0aa0, 732 },
{ 0x06a0, 748 },
{ 0x0ea0, 764 },
{ 0x0260, 780 },
{ 0x0a60, 796 },
{ 0x04a0, 812 },
{ 0x0ca0, 828 },
{ 0x0240, 844 },
{ 0x0ec0, 860 },
{ 0x01c0, 876 },
{ 0x0e40, 892 },
{ 0x0140, 908 },
{ 0x01a0, 924 },
{ 0x09a0, 940 },
{ 0x0d40, 956 },
{ 0x0340, 972 },
{ 0x05a0, 988 },
{ 0x0660, 1004 },
{ 0x0e60, 1020 },
{ 0, 0 }
};

static struct proto ExtH[] = {
{ 0x0100, 9 },
{ 0, 0 }
};

static struct proto EOLH[] = {
{ 0x0000, 11 },
{ 0, 0 }
};

static void
FillTable(struct tabent *T, int Size, struct proto *P, int State)
{
    int limit = 1 << Size;

    while (P->val) {
	int width = P->val & 15;
	int param = P->val >> 4;
	int incr = 1 << width;
	int code;
	for (code = P->code; code < limit; code += incr) {
	    struct tabent *E = T+code;
	    E->State = State;
	    E->Width = width;
	    E->Param = param;
	}
	P++;
    }
}

/* initialise the huffman code tables */
void
faxinit(void)
{
    FillTable(MainTable, 7, Pass, S_Pass);
    FillTable(MainTable, 7, Horiz, S_Horiz);
    FillTable(MainTable, 7, V0, S_V0);
    FillTable(MainTable, 7, VR, S_VR);
    FillTable(MainTable, 7, VL, S_VL);
    FillTable(MainTable, 7, ExtV, S_Ext);
    FillTable(MainTable, 7, EOLV, S_EOL);
    FillTable(WhiteTable, 12, MakeUpW, S_MakeUpW);
    FillTable(WhiteTable, 12, MakeUp, S_MakeUp);
    FillTable(WhiteTable, 12, TermW, S_TermW);
    FillTable(WhiteTable, 12, ExtH, S_Ext);
    FillTable(WhiteTable, 12, EOLH, S_EOL);
    FillTable(BlackTable, 13, MakeUpB, S_MakeUpB);
    FillTable(BlackTable, 13, MakeUp, S_MakeUp);
    FillTable(BlackTable, 13, TermB, S_TermB);
    FillTable(BlackTable, 13, ExtH, S_Ext);
    FillTable(BlackTable, 13, EOLH, S_EOL);
}