/*
 * Copyright 2003-2012 by Paulo Soares.
 *
 * This code was originally released in 2001 by SUN (see class
 * com.sun.media.imageioimpl.plugins.tiff.TIFFFaxDecompressor.java)
 * using the BSD license in a specific wording. In a mail dating from
 * January 23, 2008, Brian Burkhalter (@sun.com) gave us permission
 * to use the code under the following version of the BSD license:
 *
 * Copyright (c) 2005 Sun Microsystems, Inc. All  Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met: 
 * 
 * - Redistribution of source code must retain the above copyright 
 *   notice, this  list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in 
 *   the documentation and/or other materials provided with the
 *   distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of 
 * contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any 
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND 
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL 
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF 
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR 
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES. 
 * 
 * You acknowledge that this software is not designed or intended for 
 * use in the design, construction, operation or maintenance of any 
 * nuclear facility. 
 *
 * $Revision$
 * $Date$
 * $State: Exp $
 */
package com.itextpdf.text.pdf.codec;

//import com.itextpdf.text.error_messages.MessageLocalization;

/**
 * Class that can decompress TIFF files.
 * @since 5.0.3
 */
public class TIFFFaxDecompressor {

    /**
     * The logical order of bits within a byte.
     * <pre>
     * 1 = MSB-to-LSB
     * 2 = LSB-to-MSB (flipped)
     * </pre>
     */
    protected int fillOrder;
    protected int compression;
    private int t4Options;
    private int t6Options;
    public int fails;
    // Variables set by T4Options
    /**
     * Uncompressed mode flag: 1 if uncompressed, 0 if not.
     */
    protected int uncompressedMode = 0;
    /**
     * EOL padding flag: 1 if fill bits have been added before an EOL such
     * that the EOL ends on a byte boundary, 0 otherwise.
     */
    protected int fillBits = 0;
    /**
     * Coding dimensionality: 1 for 2-dimensional, 0 for 1-dimensional.
     */
    protected int oneD;
    private byte[] data;
    private int bitPointer, bytePointer;
    // Output image buffer
    private byte[] buffer;
    private int w, h, bitsPerScanline;
    private int lineBitNum;
    // Data structures needed to store changing elements for the previous
    // and the current scanline
    private int changingElemSize = 0;
    private int prevChangingElems[];
    private int currChangingElems[];
    // Element at which to start search in getNextChangingElement
    private int lastChangingElement = 0;
    static int table1[] = {
        0x00, // 0 bits are left in first byte - SHOULD NOT HAPPEN
        0x01, // 1 bits are left in first byte
        0x03, // 2 bits are left in first byte
        0x07, // 3 bits are left in first byte
        0x0f, // 4 bits are left in first byte
        0x1f, // 5 bits are left in first byte
        0x3f, // 6 bits are left in first byte
        0x7f, // 7 bits are left in first byte
        0xff // 8 bits are left in first byte
    };
    static int table2[] = {
        0x00, // 0
        0x80, // 1
        0xc0, // 2
        0xe0, // 3
        0xf0, // 4
        0xf8, // 5
        0xfc, // 6
        0xfe, // 7
        0xff // 8
    };
    // Table to be used when fillOrder = 2, for flipping bytes.
    static byte flipTable[] = {
        0, -128, 64, -64, 32, -96, 96, -32,
        16, -112, 80, -48, 48, -80, 112, -16,
        8, -120, 72, -56, 40, -88, 104, -24,
        24, -104, 88, -40, 56, -72, 120, -8,
        4, -124, 68, -60, 36, -92, 100, -28,
        20, -108, 84, -44, 52, -76, 116, -12,
        12, -116, 76, -52, 44, -84, 108, -20,
        28, -100, 92, -36, 60, -68, 124, -4,
        2, -126, 66, -62, 34, -94, 98, -30,
        18, -110, 82, -46, 50, -78, 114, -14,
        10, -118, 74, -54, 42, -86, 106, -22,
        26, -102, 90, -38, 58, -70, 122, -6,
        6, -122, 70, -58, 38, -90, 102, -26,
        22, -106, 86, -42, 54, -74, 118, -10,
        14, -114, 78, -50, 46, -82, 110, -18,
        30, -98, 94, -34, 62, -66, 126, -2,
        1, -127, 65, -63, 33, -95, 97, -31,
        17, -111, 81, -47, 49, -79, 113, -15,
        9, -119, 73, -55, 41, -87, 105, -23,
        25, -103, 89, -39, 57, -71, 121, -7,
        5, -123, 69, -59, 37, -91, 101, -27,
        21, -107, 85, -43, 53, -75, 117, -11,
        13, -115, 77, -51, 45, -83, 109, -19,
        29, -99, 93, -35, 61, -67, 125, -3,
        3, -125, 67, -61, 35, -93, 99, -29,
        19, -109, 83, -45, 51, -77, 115, -13,
        11, -117, 75, -53, 43, -85, 107, -21,
        27, -101, 91, -37, 59, -69, 123, -5,
        7, -121, 71, -57, 39, -89, 103, -25,
        23, -105, 87, -41, 55, -73, 119, -9,
        15, -113, 79, -49, 47, -81, 111, -17,
        31, -97, 95, -33, 63, -65, 127, -1,};
    // The main 10 bit white runs lookup table
    static short white[] = {
        // 0 - 7
        6430, 6400, 6400, 6400, 3225, 3225, 3225, 3225,
        // 8 - 15
        944, 944, 944, 944, 976, 976, 976, 976,
        // 16 - 23
        1456, 1456, 1456, 1456, 1488, 1488, 1488, 1488,
        // 24 - 31
        718, 718, 718, 718, 718, 718, 718, 718,
        // 32 - 39
        750, 750, 750, 750, 750, 750, 750, 750,
        // 40 - 47
        1520, 1520, 1520, 1520, 1552, 1552, 1552, 1552,
        // 48 - 55
        428, 428, 428, 428, 428, 428, 428, 428,
        // 56 - 63
        428, 428, 428, 428, 428, 428, 428, 428,
        // 64 - 71
        654, 654, 654, 654, 654, 654, 654, 654,
        // 72 - 79
        1072, 1072, 1072, 1072, 1104, 1104, 1104, 1104,
        // 80 - 87
        1136, 1136, 1136, 1136, 1168, 1168, 1168, 1168,
        // 88 - 95
        1200, 1200, 1200, 1200, 1232, 1232, 1232, 1232,
        // 96 - 103
        622, 622, 622, 622, 622, 622, 622, 622,
        // 104 - 111
        1008, 1008, 1008, 1008, 1040, 1040, 1040, 1040,
        // 112 - 119
        44, 44, 44, 44, 44, 44, 44, 44,
        // 120 - 127
        44, 44, 44, 44, 44, 44, 44, 44,
        // 128 - 135
        396, 396, 396, 396, 396, 396, 396, 396,
        // 136 - 143
        396, 396, 396, 396, 396, 396, 396, 396,
        // 144 - 151
        1712, 1712, 1712, 1712, 1744, 1744, 1744, 1744,
        // 152 - 159
        846, 846, 846, 846, 846, 846, 846, 846,
        // 160 - 167
        1264, 1264, 1264, 1264, 1296, 1296, 1296, 1296,
        // 168 - 175
        1328, 1328, 1328, 1328, 1360, 1360, 1360, 1360,
        // 176 - 183
        1392, 1392, 1392, 1392, 1424, 1424, 1424, 1424,
        // 184 - 191
        686, 686, 686, 686, 686, 686, 686, 686,
        // 192 - 199
        910, 910, 910, 910, 910, 910, 910, 910,
        // 200 - 207
        1968, 1968, 1968, 1968, 2000, 2000, 2000, 2000,
        // 208 - 215
        2032, 2032, 2032, 2032, 16, 16, 16, 16,
        // 216 - 223
        10257, 10257, 10257, 10257, 12305, 12305, 12305, 12305,
        // 224 - 231
        330, 330, 330, 330, 330, 330, 330, 330,
        // 232 - 239
        330, 330, 330, 330, 330, 330, 330, 330,
        // 240 - 247
        330, 330, 330, 330, 330, 330, 330, 330,
        // 248 - 255
        330, 330, 330, 330, 330, 330, 330, 330,
        // 256 - 263
        362, 362, 362, 362, 362, 362, 362, 362,
        // 264 - 271
        362, 362, 362, 362, 362, 362, 362, 362,
        // 272 - 279
        362, 362, 362, 362, 362, 362, 362, 362,
        // 280 - 287
        362, 362, 362, 362, 362, 362, 362, 362,
        // 288 - 295
        878, 878, 878, 878, 878, 878, 878, 878,
        // 296 - 303
        1904, 1904, 1904, 1904, 1936, 1936, 1936, 1936,
        // 304 - 311
        -18413, -18413, -16365, -16365, -14317, -14317, -10221, -10221,
        // 312 - 319
        590, 590, 590, 590, 590, 590, 590, 590,
        // 320 - 327
        782, 782, 782, 782, 782, 782, 782, 782,
        // 328 - 335
        1584, 1584, 1584, 1584, 1616, 1616, 1616, 1616,
        // 336 - 343
        1648, 1648, 1648, 1648, 1680, 1680, 1680, 1680,
        // 344 - 351
        814, 814, 814, 814, 814, 814, 814, 814,
        // 352 - 359
        1776, 1776, 1776, 1776, 1808, 1808, 1808, 1808,
        // 360 - 367
        1840, 1840, 1840, 1840, 1872, 1872, 1872, 1872,
        // 368 - 375
        6157, 6157, 6157, 6157, 6157, 6157, 6157, 6157,
        // 376 - 383
        6157, 6157, 6157, 6157, 6157, 6157, 6157, 6157,
        // 384 - 391
        -12275, -12275, -12275, -12275, -12275, -12275, -12275, -12275,
        // 392 - 399
        -12275, -12275, -12275, -12275, -12275, -12275, -12275, -12275,
        // 400 - 407
        14353, 14353, 14353, 14353, 16401, 16401, 16401, 16401,
        // 408 - 415
        22547, 22547, 24595, 24595, 20497, 20497, 20497, 20497,
        // 416 - 423
        18449, 18449, 18449, 18449, 26643, 26643, 28691, 28691,
        // 424 - 431
        30739, 30739, -32749, -32749, -30701, -30701, -28653, -28653,
        // 432 - 439
        -26605, -26605, -24557, -24557, -22509, -22509, -20461, -20461,
        // 440 - 447
        8207, 8207, 8207, 8207, 8207, 8207, 8207, 8207,
        // 448 - 455
        72, 72, 72, 72, 72, 72, 72, 72,
        // 456 - 463
        72, 72, 72, 72, 72, 72, 72, 72,
        // 464 - 471
        72, 72, 72, 72, 72, 72, 72, 72,
        // 472 - 479
        72, 72, 72, 72, 72, 72, 72, 72,
        // 480 - 487
        72, 72, 72, 72, 72, 72, 72, 72,
        // 488 - 495
        72, 72, 72, 72, 72, 72, 72, 72,
        // 496 - 503
        72, 72, 72, 72, 72, 72, 72, 72,
        // 504 - 511
        72, 72, 72, 72, 72, 72, 72, 72,
        // 512 - 519
        104, 104, 104, 104, 104, 104, 104, 104,
        // 520 - 527
        104, 104, 104, 104, 104, 104, 104, 104,
        // 528 - 535
        104, 104, 104, 104, 104, 104, 104, 104,
        // 536 - 543
        104, 104, 104, 104, 104, 104, 104, 104,
        // 544 - 551
        104, 104, 104, 104, 104, 104, 104, 104,
        // 552 - 559
        104, 104, 104, 104, 104, 104, 104, 104,
        // 560 - 567
        104, 104, 104, 104, 104, 104, 104, 104,
        // 568 - 575
        104, 104, 104, 104, 104, 104, 104, 104,
        // 576 - 583
        4107, 4107, 4107, 4107, 4107, 4107, 4107, 4107,
        // 584 - 591
        4107, 4107, 4107, 4107, 4107, 4107, 4107, 4107,
        // 592 - 599
        4107, 4107, 4107, 4107, 4107, 4107, 4107, 4107,
        // 600 - 607
        4107, 4107, 4107, 4107, 4107, 4107, 4107, 4107,
        // 608 - 615
        266, 266, 266, 266, 266, 266, 266, 266,
        // 616 - 623
        266, 266, 266, 266, 266, 266, 266, 266,
        // 624 - 631
        266, 266, 266, 266, 266, 266, 266, 266,
        // 632 - 639
        266, 266, 266, 266, 266, 266, 266, 266,
        // 640 - 647
        298, 298, 298, 298, 298, 298, 298, 298,
        // 648 - 655
        298, 298, 298, 298, 298, 298, 298, 298,
        // 656 - 663
        298, 298, 298, 298, 298, 298, 298, 298,
        // 664 - 671
        298, 298, 298, 298, 298, 298, 298, 298,
        // 672 - 679
        524, 524, 524, 524, 524, 524, 524, 524,
        // 680 - 687
        524, 524, 524, 524, 524, 524, 524, 524,
        // 688 - 695
        556, 556, 556, 556, 556, 556, 556, 556,
        // 696 - 703
        556, 556, 556, 556, 556, 556, 556, 556,
        // 704 - 711
        136, 136, 136, 136, 136, 136, 136, 136,
        // 712 - 719
        136, 136, 136, 136, 136, 136, 136, 136,
        // 720 - 727
        136, 136, 136, 136, 136, 136, 136, 136,
        // 728 - 735
        136, 136, 136, 136, 136, 136, 136, 136,
        // 736 - 743
        136, 136, 136, 136, 136, 136, 136, 136,
        // 744 - 751
        136, 136, 136, 136, 136, 136, 136, 136,
        // 752 - 759
        136, 136, 136, 136, 136, 136, 136, 136,
        // 760 - 767
        136, 136, 136, 136, 136, 136, 136, 136,
        // 768 - 775
        168, 168, 168, 168, 168, 168, 168, 168,
        // 776 - 783
        168, 168, 168, 168, 168, 168, 168, 168,
        // 784 - 791
        168, 168, 168, 168, 168, 168, 168, 168,
        // 792 - 799
        168, 168, 168, 168, 168, 168, 168, 168,
        // 800 - 807
        168, 168, 168, 168, 168, 168, 168, 168,
        // 808 - 815
        168, 168, 168, 168, 168, 168, 168, 168,
        // 816 - 823
        168, 168, 168, 168, 168, 168, 168, 168,
        // 824 - 831
        168, 168, 168, 168, 168, 168, 168, 168,
        // 832 - 839
        460, 460, 460, 460, 460, 460, 460, 460,
        // 840 - 847
        460, 460, 460, 460, 460, 460, 460, 460,
        // 848 - 855
        492, 492, 492, 492, 492, 492, 492, 492,
        // 856 - 863
        492, 492, 492, 492, 492, 492, 492, 492,
        // 864 - 871
        2059, 2059, 2059, 2059, 2059, 2059, 2059, 2059,
        // 872 - 879
        2059, 2059, 2059, 2059, 2059, 2059, 2059, 2059,
        // 880 - 887
        2059, 2059, 2059, 2059, 2059, 2059, 2059, 2059,
        // 888 - 895
        2059, 2059, 2059, 2059, 2059, 2059, 2059, 2059,
        // 896 - 903
        200, 200, 200, 200, 200, 200, 200, 200,
        // 904 - 911
        200, 200, 200, 200, 200, 200, 200, 200,
        // 912 - 919
        200, 200, 200, 200, 200, 200, 200, 200,
        // 920 - 927
        200, 200, 200, 200, 200, 200, 200, 200,
        // 928 - 935
        200, 200, 200, 200, 200, 200, 200, 200,
        // 936 - 943
        200, 200, 200, 200, 200, 200, 200, 200,
        // 944 - 951
        200, 200, 200, 200, 200, 200, 200, 200,
        // 952 - 959
        200, 200, 200, 200, 200, 200, 200, 200,
        // 960 - 967
        232, 232, 232, 232, 232, 232, 232, 232,
        // 968 - 975
        232, 232, 232, 232, 232, 232, 232, 232,
        // 976 - 983
        232, 232, 232, 232, 232, 232, 232, 232,
        // 984 - 991
        232, 232, 232, 232, 232, 232, 232, 232,
        // 992 - 999
        232, 232, 232, 232, 232, 232, 232, 232,
        // 1000 - 1007
        232, 232, 232, 232, 232, 232, 232, 232,
        // 1008 - 1015
        232, 232, 232, 232, 232, 232, 232, 232,
        // 1016 - 1023
        232, 232, 232, 232, 232, 232, 232, 232,};
    // Additional make up codes for both White and Black runs
    static short additionalMakeup[] = {
        28679, 28679, 31752, (short) 32777,
        (short) 33801, (short) 34825, (short) 35849, (short) 36873,
        (short) 29703, (short) 29703, (short) 30727, (short) 30727,
        (short) 37897, (short) 38921, (short) 39945, (short) 40969
    };
    // Initial black run look up table, uses the first 4 bits of a code
    static short initBlack[] = {
        // 0 - 7
        3226, 6412, 200, 168, 38, 38, 134, 134,
        // 8 - 15
        100, 100, 100, 100, 68, 68, 68, 68
    };
    // 
    static short twoBitBlack[] = {292, 260, 226, 226};   // 0 - 3
    // Main black run table, using the last 9 bits of possible 13 bit code
    static short black[] = {
        // 0 - 7
        62, 62, 30, 30, 0, 0, 0, 0,
        // 8 - 15
        0, 0, 0, 0, 0, 0, 0, 0,
        // 16 - 23
        0, 0, 0, 0, 0, 0, 0, 0,
        // 24 - 31
        0, 0, 0, 0, 0, 0, 0, 0,
        // 32 - 39
        3225, 3225, 3225, 3225, 3225, 3225, 3225, 3225,
        // 40 - 47
        3225, 3225, 3225, 3225, 3225, 3225, 3225, 3225,
        // 48 - 55
        3225, 3225, 3225, 3225, 3225, 3225, 3225, 3225,
        // 56 - 63
        3225, 3225, 3225, 3225, 3225, 3225, 3225, 3225,
        // 64 - 71
        588, 588, 588, 588, 588, 588, 588, 588,
        // 72 - 79
        1680, 1680, 20499, 22547, 24595, 26643, 1776, 1776,
        // 80 - 87
        1808, 1808, -24557, -22509, -20461, -18413, 1904, 1904,
        // 88 - 95
        1936, 1936, -16365, -14317, 782, 782, 782, 782,
        // 96 - 103
        814, 814, 814, 814, -12269, -10221, 10257, 10257,
        // 104 - 111
        12305, 12305, 14353, 14353, 16403, 18451, 1712, 1712,
        // 112 - 119
        1744, 1744, 28691, 30739, -32749, -30701, -28653, -26605,
        // 120 - 127
        2061, 2061, 2061, 2061, 2061, 2061, 2061, 2061,
        // 128 - 135
        424, 424, 424, 424, 424, 424, 424, 424,
        // 136 - 143
        424, 424, 424, 424, 424, 424, 424, 424,
        // 144 - 151
        424, 424, 424, 424, 424, 424, 424, 424,
        // 152 - 159
        424, 424, 424, 424, 424, 424, 424, 424,
        // 160 - 167
        750, 750, 750, 750, 1616, 1616, 1648, 1648,
        // 168 - 175
        1424, 1424, 1456, 1456, 1488, 1488, 1520, 1520,
        // 176 - 183
        1840, 1840, 1872, 1872, 1968, 1968, 8209, 8209,
        // 184 - 191
        524, 524, 524, 524, 524, 524, 524, 524,
        // 192 - 199
        556, 556, 556, 556, 556, 556, 556, 556,
        // 200 - 207
        1552, 1552, 1584, 1584, 2000, 2000, 2032, 2032,
        // 208 - 215
        976, 976, 1008, 1008, 1040, 1040, 1072, 1072,
        // 216 - 223
        1296, 1296, 1328, 1328, 718, 718, 718, 718,
        // 224 - 231
        456, 456, 456, 456, 456, 456, 456, 456,
        // 232 - 239
        456, 456, 456, 456, 456, 456, 456, 456,
        // 240 - 247
        456, 456, 456, 456, 456, 456, 456, 456,
        // 248 - 255
        456, 456, 456, 456, 456, 456, 456, 456,
        // 256 - 263
        326, 326, 326, 326, 326, 326, 326, 326,
        // 264 - 271
        326, 326, 326, 326, 326, 326, 326, 326,
        // 272 - 279
        326, 326, 326, 326, 326, 326, 326, 326,
        // 280 - 287
        326, 326, 326, 326, 326, 326, 326, 326,
        // 288 - 295
        326, 326, 326, 326, 326, 326, 326, 326,
        // 296 - 303
        326, 326, 326, 326, 326, 326, 326, 326,
        // 304 - 311
        326, 326, 326, 326, 326, 326, 326, 326,
        // 312 - 319
        326, 326, 326, 326, 326, 326, 326, 326,
        // 320 - 327
        358, 358, 358, 358, 358, 358, 358, 358,
        // 328 - 335
        358, 358, 358, 358, 358, 358, 358, 358,
        // 336 - 343
        358, 358, 358, 358, 358, 358, 358, 358,
        // 344 - 351
        358, 358, 358, 358, 358, 358, 358, 358,
        // 352 - 359
        358, 358, 358, 358, 358, 358, 358, 358,
        // 360 - 367
        358, 358, 358, 358, 358, 358, 358, 358,
        // 368 - 375
        358, 358, 358, 358, 358, 358, 358, 358,
        // 376 - 383
        358, 358, 358, 358, 358, 358, 358, 358,
        // 384 - 391
        490, 490, 490, 490, 490, 490, 490, 490,
        // 392 - 399
        490, 490, 490, 490, 490, 490, 490, 490,
        // 400 - 407
        4113, 4113, 6161, 6161, 848, 848, 880, 880,
        // 408 - 415
        912, 912, 944, 944, 622, 622, 622, 622,
        // 416 - 423
        654, 654, 654, 654, 1104, 1104, 1136, 1136,
        // 424 - 431
        1168, 1168, 1200, 1200, 1232, 1232, 1264, 1264,
        // 432 - 439
        686, 686, 686, 686, 1360, 1360, 1392, 1392,
        // 440 - 447
        12, 12, 12, 12, 12, 12, 12, 12,
        // 448 - 455
        390, 390, 390, 390, 390, 390, 390, 390,
        // 456 - 463
        390, 390, 390, 390, 390, 390, 390, 390,
        // 464 - 471
        390, 390, 390, 390, 390, 390, 390, 390,
        // 472 - 479
        390, 390, 390, 390, 390, 390, 390, 390,
        // 480 - 487
        390, 390, 390, 390, 390, 390, 390, 390,
        // 488 - 495
        390, 390, 390, 390, 390, 390, 390, 390,
        // 496 - 503
        390, 390, 390, 390, 390, 390, 390, 390,
        // 504 - 511
        390, 390, 390, 390, 390, 390, 390, 390,};
    static byte twoDCodes[] = {
        // 0 - 7
        80, 88, 23, 71, 30, 30, 62, 62,
        // 8 - 15
        4, 4, 4, 4, 4, 4, 4, 4,
        // 16 - 23
        11, 11, 11, 11, 11, 11, 11, 11,
        // 24 - 31
        11, 11, 11, 11, 11, 11, 11, 11,
        // 32 - 39
        35, 35, 35, 35, 35, 35, 35, 35,
        // 40 - 47
        35, 35, 35, 35, 35, 35, 35, 35,
        // 48 - 55
        51, 51, 51, 51, 51, 51, 51, 51,
        // 56 - 63
        51, 51, 51, 51, 51, 51, 51, 51,
        // 64 - 71
        41, 41, 41, 41, 41, 41, 41, 41,
        // 72 - 79
        41, 41, 41, 41, 41, 41, 41, 41,
        // 80 - 87
        41, 41, 41, 41, 41, 41, 41, 41,
        // 88 - 95
        41, 41, 41, 41, 41, 41, 41, 41,
        // 96 - 103
        41, 41, 41, 41, 41, 41, 41, 41,
        // 104 - 111
        41, 41, 41, 41, 41, 41, 41, 41,
        // 112 - 119
        41, 41, 41, 41, 41, 41, 41, 41,
        // 120 - 127
        41, 41, 41, 41, 41, 41, 41, 41,};

    public TIFFFaxDecompressor() {
    }

    /**
     * Invokes the superclass method and then sets instance variables on
     * the basis of the metadata set on this decompressor.
     */
    public void SetOptions(int fillOrder, int compression, int t4Options, int t6Options) {
        this.fillOrder = fillOrder;
        this.compression = compression;
        this.t4Options = t4Options;
        this.t6Options = t6Options;
        this.oneD = (int) (t4Options & 0x01);
        this.uncompressedMode = (int) ((t4Options & 0x02) >> 1);
        this.fillBits = (int) ((t4Options & 0x04) >> 2);
    }

    public void decodeRaw(byte[] buffer, byte[] compData, int w, int h) {

        this.buffer = buffer;
        this.data = compData;
        this.w = w;
        this.h = h;
        this.bitsPerScanline = w;
        this.lineBitNum = 0;

        this.bitPointer = 0;
        this.bytePointer = 0;
        this.prevChangingElems = new int[w + 1];
        this.currChangingElems = new int[w + 1];

        fails = 0;

        try {
            if (compression == TIFFConstants.COMPRESSION_CCITTRLE) {
                decodeRLE();
            } else if (compression == TIFFConstants.COMPRESSION_CCITTFAX3) {
                decodeT4();
            } else if (compression == TIFFConstants.COMPRESSION_CCITTFAX4) {
                this.uncompressedMode = (int) ((t6Options & 0x02) >> 1);
                decodeT6();
            } else {
                throw new RuntimeException("Unknown compression type " + compression);
            }
        } catch (ArrayIndexOutOfBoundsException e) {
            //ignore
        }
    }

    public void decodeRLE() {
        for (int i = 0; i < h; i++) {
            // Decode the line.
            decodeNextScanline();

            // Advance to the next byte boundary if not already there.
            if (bitPointer != 0) {
                bytePointer++;
                bitPointer = 0;
            }

            // Update the total number of bits.
            lineBitNum += bitsPerScanline;
        }
    }

    public void decodeNextScanline() {
        int bits = 0, code = 0, isT = 0;
        int current, entry, twoBits;
        boolean isWhite = true;

        int bitOffset = 0;

        // Initialize starting of the changing elements array
        changingElemSize = 0;

        // While scanline not complete
        while (bitOffset < w) {

            // Mark start of white run.
            int runOffset = bitOffset;

            while (isWhite && bitOffset < w) {
                // White run
                current = nextNBits(10);
                entry = white[current];

                // Get the 3 fields from the entry
                isT = entry & 0x0001;
                bits = (entry >>> 1) & 0x0f;

                if (bits == 12) {          // Additional Make up code
                    // Get the next 2 bits
                    twoBits = nextLesserThan8Bits(2);
                    // Consolidate the 2 new bits and last 2 bits into 4 bits
                    current = ((current << 2) & 0x000c) | twoBits;
                    entry = additionalMakeup[current];
                    bits = (entry >>> 1) & 0x07;     // 3 bits 0000 0111
                    code = (entry >>> 4) & 0x0fff;  // 12 bits
                    bitOffset += code; // Skip white run

                    updatePointer(4 - bits);
                } else if (bits == 0) {     // ERROR
                    ++fails;
                    // XXX return?
                } else if (bits == 15) {    // EOL
                    //
                    // Instead of throwing an exception, assume that the
                    // EOL was premature; emit a warning and return.
                    //
                    ++fails;
                    return;
                } else {
                    // 11 bits - 0000 0111 1111 1111 = 0x07ff
                    code = (entry >>> 5) & 0x07ff;
                    bitOffset += code;

                    updatePointer(10 - bits);
                    if (isT == 0) {
                        isWhite = false;
                        currChangingElems[changingElemSize++] = bitOffset;
                    }
                }
            }

            // Check whether this run completed one width
            if (bitOffset == w) {
                // If the white run has not been terminated then ensure that
                // the next code word is a terminating code for a white run
                // of length zero.
                int runLength = bitOffset - runOffset;
                if (isWhite
                        && runLength != 0 && runLength % 64 == 0
                        && nextNBits(8) != 0x35) {
                    ++fails;
                    updatePointer(8);
                }
                break;
            }

            // Mark start of black run.
            runOffset = bitOffset;

            while (isWhite == false && bitOffset < w) {
                // Black run
                current = nextLesserThan8Bits(4);
                entry = initBlack[current];

                // Get the 3 fields from the entry
                isT = entry & 0x0001;
                bits = (entry >>> 1) & 0x000f;
                code = (entry >>> 5) & 0x07ff;

                if (code == 100) {
                    current = nextNBits(9);
                    entry = black[current];

                    // Get the 3 fields from the entry
                    isT = entry & 0x0001;
                    bits = (entry >>> 1) & 0x000f;
                    code = (entry >>> 5) & 0x07ff;

                    if (bits == 12) {
                        // Additional makeup codes
                        updatePointer(5);
                        current = nextLesserThan8Bits(4);
                        entry = additionalMakeup[current];
                        bits = (entry >>> 1) & 0x07;     // 3 bits 0000 0111
                        code = (entry >>> 4) & 0x0fff;  // 12 bits

                        setToBlack(bitOffset, code);
                        bitOffset += code;

                        updatePointer(4 - bits);
                    } else if (bits == 15) {
                        //
                        // Instead of throwing an exception, assume that the
                        // EOL was premature; emit a warning and return.
                        //
                        ++fails;
                        return;
                    } else {
                        setToBlack(bitOffset, code);
                        bitOffset += code;

                        updatePointer(9 - bits);
                        if (isT == 0) {
                            isWhite = true;
                            currChangingElems[changingElemSize++] = bitOffset;
                        }
                    }
                } else if (code == 200) {
                    // Is a Terminating code
                    current = nextLesserThan8Bits(2);
                    entry = twoBitBlack[current];
                    code = (entry >>> 5) & 0x07ff;
                    bits = (entry >>> 1) & 0x0f;

                    setToBlack(bitOffset, code);
                    bitOffset += code;

                    updatePointer(2 - bits);
                    isWhite = true;
                    currChangingElems[changingElemSize++] = bitOffset;
                } else {
                    // Is a Terminating code
                    setToBlack(bitOffset, code);
                    bitOffset += code;

                    updatePointer(4 - bits);
                    isWhite = true;
                    currChangingElems[changingElemSize++] = bitOffset;
                }
            }

            // Check whether this run completed one width
            if (bitOffset == w) {
                // If the black run has not been terminated then ensure that
                // the next code word is a terminating code for a black run
                // of length zero.
                int runLength = bitOffset - runOffset;
                if (!isWhite
                        && runLength != 0 && runLength % 64 == 0
                        && nextNBits(10) != 0x37) {
                    ++fails;
                    updatePointer(10);
                }
                break;
            }
        }

        currChangingElems[changingElemSize++] = bitOffset;
    }

    public void decodeT4() {
        int height = h;

        int a0, a1, b1, b2;
        int[] b = new int[2];
        int entry, code, bits, color;
        boolean isWhite;
        int currIndex = 0;
        int temp[];

        if (data.length < 2) {
            throw new RuntimeException("Insufficient data to read initial EOL.");
        }

        // The data should start with an EOL code
        int next12 = nextNBits(12);
        if (next12 != 1) {
            ++fails;
        }
        updatePointer(12);

        // Find the first one-dimensionally encoded line.
        int modeFlag = 0;
        int lines = -1; // indicates imaginary line before first actual line.
        while (modeFlag != 1) {
            try {
                modeFlag = findNextLine();
                lines++; // Normally 'lines' will be 0 on exiting loop.
            } catch (Exception eofe) {
                throw new RuntimeException("No reference line present.");
            }
        }

        int bitOffset;

        // Then the 1D encoded scanline data will occur, changing elements
        // array gets set.
        decodeNextScanline();
        lines++;
        lineBitNum += bitsPerScanline;

        while (lines < height) {

            // Every line must begin with an EOL followed by a bit which
            // indicates whether the following scanline is 1D or 2D encoded.
            try {
                modeFlag = findNextLine();
            } catch (Exception eofe) {
                ++fails;
                break;
            }
            if (modeFlag == 0) {
                // 2D encoded scanline follows

                // Initialize previous scanlines changing elements, and
                // initialize current scanline's changing elements array
                temp = prevChangingElems;
                prevChangingElems = currChangingElems;
                currChangingElems = temp;
                currIndex = 0;

                // a0 has to be set just before the start of this scanline.
                a0 = -1;
                isWhite = true;
                bitOffset = 0;

                lastChangingElement = 0;

                while (bitOffset < w) {
                    // Get the next changing element
                    getNextChangingElement(a0, isWhite, b);

                    b1 = b[0];
                    b2 = b[1];

                    // Get the next seven bits
                    entry = nextLesserThan8Bits(7);

                    // Run these through the 2DCodes table
                    entry = (int) (twoDCodes[entry] & 0xff);

                    // Get the code and the number of bits used up
                    code = (entry & 0x78) >>> 3;
                    bits = entry & 0x07;

                    if (code == 0) {
                        if (!isWhite) {
                            setToBlack(bitOffset, b2 - bitOffset);
                        }
                        bitOffset = a0 = b2;

                        // Set pointer to consume the correct number of bits.
                        updatePointer(7 - bits);
                    } else if (code == 1) {
                        // Horizontal
                        updatePointer(7 - bits);

                        // identify the next 2 codes.
                        int number;
                        if (isWhite) {
                            number = decodeWhiteCodeWord();
                            bitOffset += number;
                            currChangingElems[currIndex++] = bitOffset;

                            number = decodeBlackCodeWord();
                            setToBlack(bitOffset, number);
                            bitOffset += number;
                            currChangingElems[currIndex++] = bitOffset;
                        } else {
                            number = decodeBlackCodeWord();
                            setToBlack(bitOffset, number);
                            bitOffset += number;
                            currChangingElems[currIndex++] = bitOffset;

                            number = decodeWhiteCodeWord();
                            bitOffset += number;
                            currChangingElems[currIndex++] = bitOffset;
                        }

                        a0 = bitOffset;
                    } else if (code <= 8) {
                        // Vertical
                        a1 = b1 + (code - 5);

                        currChangingElems[currIndex++] = a1;

                        // We write the current color till a1 - 1 pos,
                        // since a1 is where the next color starts
                        if (!isWhite) {
                            setToBlack(bitOffset, a1 - bitOffset);
                        }
                        bitOffset = a0 = a1;
                        isWhite = !isWhite;

                        updatePointer(7 - bits);
                    } else {
                        ++fails;
                        // Find the next one-dimensionally encoded line.
                        int numLinesTested = 0;
                        while (modeFlag != 1) {
                            try {
                                modeFlag = findNextLine();
                                numLinesTested++;
                            } catch (Exception eofe) {
                                return;
                            }
                        }
                        lines += numLinesTested - 1;
                        updatePointer(13);
                        break;
                    }
                }

                // Add the changing element beyond the current scanline for the
                // other color too
                currChangingElems[currIndex++] = bitOffset;
                changingElemSize = currIndex;
            } else { // modeFlag == 1
                // 1D encoded scanline follows
                decodeNextScanline();
            }

            lineBitNum += bitsPerScanline;
            lines++;
        } // while(lines < height)
    }

    public synchronized void decodeT6() {
        int height = h;


        int a0, a1, b1, b2;
        int entry, code, bits;
        boolean isWhite;
        int currIndex;
        int temp[];

        // Return values from getNextChangingElement
        int[] b = new int[2];

        // uncompressedMode - have written some code for this, but this
        // has not been tested due to lack of test images using this optional
        // extension. This code is when code == 11. aastha 03/03/1999

        // Local cached reference
        int[] cce = currChangingElems;

        // Assume invisible preceding row of all white pixels and insert
        // both black and white changing elements beyond the end of this
        // imaginary scanline.
        changingElemSize = 0;
        cce[changingElemSize++] = w;
        cce[changingElemSize++] = w;

        int bitOffset;

        for (int lines = 0; lines < height; lines++) {
            // a0 has to be set just before the start of the scanline.
            a0 = -1;
            isWhite = true;

            // Assign the changing elements of the previous scanline to
            // prevChangingElems and start putting this new scanline's
            // changing elements into the currChangingElems.
            temp = prevChangingElems;
            prevChangingElems = currChangingElems;
            cce = currChangingElems = temp;
            currIndex = 0;

            // Start decoding the scanline
            bitOffset = 0;

            // Reset search start position for getNextChangingElement
            lastChangingElement = 0;

            // Till one whole scanline is decoded
            while (bitOffset < w) {
                // Get the next changing element
                getNextChangingElement(a0, isWhite, b);
                b1 = b[0];
                b2 = b[1];

                // Get the next seven bits
                entry = nextLesserThan8Bits(7);
                // Run these through the 2DCodes table
                entry = (int) (twoDCodes[entry] & 0xff);

                // Get the code and the number of bits used up
                code = (entry & 0x78) >>> 3;
                bits = entry & 0x07;

                if (code == 0) { // Pass
                    // We always assume WhiteIsZero format for fax.
                    if (!isWhite) {
                        if (b2 > w) {
                            b2 = w;
                        }
                        setToBlack(bitOffset, b2 - bitOffset);
                    }
                    bitOffset = a0 = b2;

                    // Set pointer to only consume the correct number of bits.
                    updatePointer(7 - bits);
                } else if (code == 1) { // Horizontal
                    // Set pointer to only consume the correct number of bits.
                    updatePointer(7 - bits);

                    // identify the next 2 alternating color codes.
                    int number;
                    if (isWhite) {
                        // Following are white and black runs
                        number = decodeWhiteCodeWord();
                        bitOffset += number;
                        cce[currIndex++] = bitOffset;

                        number = decodeBlackCodeWord();
                        if (number > w - bitOffset) {
                            number = w - bitOffset;
                        }
                        setToBlack(bitOffset, number);
                        bitOffset += number;
                        cce[currIndex++] = bitOffset;
                    } else {
                        // First a black run and then a white run follows
                        number = decodeBlackCodeWord();
                        if (number > w - bitOffset) {
                            number = w - bitOffset;
                        }
                        setToBlack(bitOffset, number);
                        bitOffset += number;
                        cce[currIndex++] = bitOffset;

                        number = decodeWhiteCodeWord();
                        bitOffset += number;
                        cce[currIndex++] = bitOffset;
                    }

                    a0 = bitOffset;
                } else if (code <= 8) { // Vertical
                    a1 = b1 + (code - 5);
                    cce[currIndex++] = a1;

                    // We write the current color till a1 - 1 pos,
                    // since a1 is where the next color starts
                    if (!isWhite) {
                        if (a1 > w) {
                            a1 = w;
                        }
                        setToBlack(bitOffset, a1 - bitOffset);
                    }
                    bitOffset = a0 = a1;
                    isWhite = !isWhite;

                    updatePointer(7 - bits);
                } else if (code == 11) {
                    int entranceCode = nextLesserThan8Bits(3);

                    int zeros = 0;
                    boolean exit = false;

                    while (!exit) {
                        while (nextLesserThan8Bits(1) != 1) {
                            zeros++;
                        }

                        if (zeros > 5) {
                            // Exit code

                            // Zeros before exit code
                            zeros = zeros - 6;

                            if (!isWhite && (zeros > 0)) {
                                cce[currIndex++] = bitOffset;
                            }

                            // Zeros before the exit code
                            bitOffset += zeros;
                            if (zeros > 0) {
                                // Some zeros have been written
                                isWhite = true;
                            }

                            // Read in the bit which specifies the color of
                            // the following run
                            if (nextLesserThan8Bits(1) == 0) {
                                if (!isWhite) {
                                    cce[currIndex++] = bitOffset;
                                }
                                isWhite = true;
                            } else {
                                if (isWhite) {
                                    cce[currIndex++] = bitOffset;
                                }
                                isWhite = false;
                            }

                            exit = true;
                        }

                        if (zeros == 5) {
                            if (!isWhite) {
                                cce[currIndex++] = bitOffset;
                            }
                            bitOffset += zeros;

                            // Last thing written was white
                            isWhite = true;
                        } else {
                            bitOffset += zeros;

                            cce[currIndex++] = bitOffset;
                            setToBlack(bitOffset, 1);
                            ++bitOffset;

                            // Last thing written was black
                            isWhite = false;
                        }

                    }
                }
            } // while bitOffset < w

            // Add the changing element beyond the current scanline for the
            // other color too, if not already added previously
            if (currIndex <= w)
                cce[currIndex++] = bitOffset;

            // Number of changing elements in this scanline.
            changingElemSize = currIndex;

            lineBitNum += bitsPerScanline;
        } // for lines < height
    }

    private void setToBlack(int bitNum, int numBits) {
        // bitNum is relative to current scanline so bump it by lineBitNum
        bitNum += lineBitNum;

        int lastBit = bitNum + numBits;
        int byteNum = bitNum >> 3;

        // Handle bits in first byte
        int shift = bitNum & 0x7;
        if (shift > 0) {
            int maskVal = 1 << (7 - shift);
            byte val = buffer[byteNum];
            while (maskVal > 0 && bitNum < lastBit) {
                val |= maskVal;
                maskVal >>= 1;
                ++bitNum;
            }
            buffer[byteNum] = val;
        }

        // Fill in 8 bits at a time
        byteNum = bitNum >> 3;
        while (bitNum < lastBit - 7) {
            buffer[byteNum++] = (byte) 255;
            bitNum += 8;
        }

        // Fill in remaining bits
        while (bitNum < lastBit) {
            byteNum = bitNum >> 3;
            buffer[byteNum] |= 1 << (7 - (bitNum & 0x7));
            ++bitNum;
        }
    }

    // Returns run length
    private int decodeWhiteCodeWord() {
        int current, entry, bits, isT, twoBits, code = -1;
        int runLength = 0;
        boolean isWhite = true;

        while (isWhite) {
            current = nextNBits(10);
            entry = white[current];

            // Get the 3 fields from the entry
            isT = entry & 0x0001;
            bits = (entry >>> 1) & 0x0f;

            if (bits == 12) {           // Additional Make up code
                // Get the next 2 bits
                twoBits = nextLesserThan8Bits(2);
                // Consolidate the 2 new bits and last 2 bits into 4 bits
                current = ((current << 2) & 0x000c) | twoBits;
                entry = additionalMakeup[current];
                bits = (entry >>> 1) & 0x07;     // 3 bits 0000 0111
                code = (entry >>> 4) & 0x0fff;   // 12 bits
                runLength += code;
                updatePointer(4 - bits);
            } else if (bits == 0) {     // ERROR
                throw new RuntimeException("Error 0");
            } else if (bits == 15) {    // EOL
                throw new RuntimeException("Error 1");
            } else {
                // 11 bits - 0000 0111 1111 1111 = 0x07ff
                code = (entry >>> 5) & 0x07ff;
                runLength += code;
                updatePointer(10 - bits);
                if (isT == 0) {
                    isWhite = false;
                }
            }
        }

        return runLength;
    }

    // Returns run length
    private int decodeBlackCodeWord() {
        int current, entry, bits, isT, twoBits, code = -1;
        int runLength = 0;
        boolean isWhite = false;

        while (!isWhite) {
            current = nextLesserThan8Bits(4);
            entry = initBlack[current];

            // Get the 3 fields from the entry
            isT = entry & 0x0001;
            bits = (entry >>> 1) & 0x000f;
            code = (entry >>> 5) & 0x07ff;

            if (code == 100) {
                current = nextNBits(9);
                entry = black[current];

                // Get the 3 fields from the entry
                isT = entry & 0x0001;
                bits = (entry >>> 1) & 0x000f;
                code = (entry >>> 5) & 0x07ff;

                if (bits == 12) {
                    // Additional makeup codes
                    updatePointer(5);
                    current = nextLesserThan8Bits(4);
                    entry = additionalMakeup[current];
                    bits = (entry >>> 1) & 0x07;     // 3 bits 0000 0111
                    code = (entry >>> 4) & 0x0fff;  // 12 bits
                    runLength += code;

                    updatePointer(4 - bits);
                } else if (bits == 15) {
                    // EOL code
                    throw new RuntimeException("Error 2");
                } else {
                    runLength += code;
                    updatePointer(9 - bits);
                    if (isT == 0) {
                        isWhite = true;
                    }
                }
            } else if (code == 200) {
                // Is a Terminating code
                current = nextLesserThan8Bits(2);
                entry = twoBitBlack[current];
                code = (entry >>> 5) & 0x07ff;
                runLength += code;
                bits = (entry >>> 1) & 0x0f;
                updatePointer(2 - bits);
                isWhite = true;
            } else {
                // Is a Terminating code
                runLength += code;
                updatePointer(4 - bits);
                isWhite = true;
            }
        }

        return runLength;
    }

    private int findNextLine() {
        // Set maximum and current bit index into the compressed data.
        int bitIndexMax = data.length * 8 - 1;
        int bitIndexMax12 = bitIndexMax - 12;
        int bitIndex = bytePointer * 8 + bitPointer;

        // Loop while at least 12 bits are available.
        while (bitIndex <= bitIndexMax12) {
            // Get the next 12 bits.
            int next12Bits = nextNBits(12);
            bitIndex += 12;

            // Loop while the 12 bits are not unity, i.e., while the EOL
            // has not been reached, and there is at least one bit left.
            while (next12Bits != 1 && bitIndex < bitIndexMax) {
                next12Bits =
                        ((next12Bits & 0x000007ff) << 1)
                        | (nextLesserThan8Bits(1) & 0x00000001);
                bitIndex++;
            }

            if (next12Bits == 1) { // now positioned just after EOL
                if (oneD == 1) { // two-dimensional coding
                    if (bitIndex < bitIndexMax) {
                        // check next bit against type of line being sought
                        return nextLesserThan8Bits(1);
                    }
                } else {
                    return 1;
                }
            }
        }

        // EOL not found.
        throw new RuntimeException();
    }

    private void getNextChangingElement(int a0, boolean isWhite, int[] ret) {
        // Local copies of instance variables
        int[] pce = this.prevChangingElems;
        int ces = this.changingElemSize;

        // If the previous match was at an odd element, we still
        // have to search the preceeding element.
        // int start = lastChangingElement & ~0x1;
        int start = lastChangingElement > 0 ? lastChangingElement - 1 : 0;
        if (isWhite) {
            start &= ~0x1; // Search even numbered elements
        } else {
            start |= 0x1; // Search odd numbered elements
        }

        int i = start;
        for (; i < ces; i += 2) {
            int temp = pce[i];
            if (temp > a0) {
                lastChangingElement = i;
                ret[0] = temp;
                break;
            }
        }

        if (i + 1 < ces) {
            ret[1] = pce[i + 1];
        }
    }

    private int nextNBits(int bitsToGet) {
        byte b, next, next2next;
        int l = data.length - 1;
        int bp = this.bytePointer;

        if (fillOrder == 1) {
            b = data[bp];

            if (bp == l) {
                next = 0x00;
                next2next = 0x00;
            } else if ((bp + 1) == l) {
                next = data[bp + 1];
                next2next = 0x00;
            } else {
                next = data[bp + 1];
                next2next = data[bp + 2];
            }
        } else if (fillOrder == 2) {
            b = flipTable[data[bp] & 0xff];

            if (bp == l) {
                next = 0x00;
                next2next = 0x00;
            } else if ((bp + 1) == l) {
                next = flipTable[data[bp + 1] & 0xff];
                next2next = 0x00;
            } else {
                next = flipTable[data[bp + 1] & 0xff];
                next2next = flipTable[data[bp + 2] & 0xff];
            }
        } else {
            throw new RuntimeException("Invalid FillOrder");
        }

        int bitsLeft = 8 - bitPointer;
        int bitsFromNextByte = bitsToGet - bitsLeft;
        int bitsFromNext2NextByte = 0;
        if (bitsFromNextByte > 8) {
            bitsFromNext2NextByte = bitsFromNextByte - 8;
            bitsFromNextByte = 8;
        }

        bytePointer++;

        int i1 = (b & table1[bitsLeft]) << (bitsToGet - bitsLeft);
        int i2 = (next & table2[bitsFromNextByte]) >>> (8 - bitsFromNextByte);

        int i3 = 0;
        if (bitsFromNext2NextByte != 0) {
            i2 <<= bitsFromNext2NextByte;
            i3 = (next2next & table2[bitsFromNext2NextByte])
                    >>> (8 - bitsFromNext2NextByte);
            i2 |= i3;
            bytePointer++;
            bitPointer = bitsFromNext2NextByte;
        } else {
            if (bitsFromNextByte == 8) {
                bitPointer = 0;
                bytePointer++;
            } else {
                bitPointer = bitsFromNextByte;
            }
        }

        int i = i1 | i2;
        return i;
    }

    private int nextLesserThan8Bits(int bitsToGet) {
        byte b, next;
        int l = data.length - 1;
        int bp = this.bytePointer;

        if (fillOrder == 1) {
            b = data[bp];
            if (bp == l) {
                next = 0x00;
            } else {
                next = data[bp + 1];
            }
        } else if (fillOrder == 2) {
            b = flipTable[data[bp] & 0xff];
            if (bp == l) {
                next = 0x00;
            } else {
                next = flipTable[data[bp + 1] & 0xff];
            }
        } else {
            throw new RuntimeException("Invalid FillOrder");
        }

        int bitsLeft = 8 - bitPointer;
        int bitsFromNextByte = bitsToGet - bitsLeft;

        int shift = bitsLeft - bitsToGet;
        int i1, i2;
        if (shift >= 0) {
            i1 = (b & table1[bitsLeft]) >>> shift;
            bitPointer += bitsToGet;
            if (bitPointer == 8) {
                bitPointer = 0;
                bytePointer++;
            }
        } else {
            i1 = (b & table1[bitsLeft]) << (-shift);
            i2 = (next & table2[bitsFromNextByte]) >>> (8 - bitsFromNextByte);

            i1 |= i2;
            bytePointer++;
            bitPointer = bitsFromNextByte;
        }

        return i1;
    }

    // Move pointer backwards by given amount of bits
    private void updatePointer(int bitsToMoveBack) {
        if (bitsToMoveBack > 8) {
            bytePointer -= bitsToMoveBack / 8;
            bitsToMoveBack %= 8;
        }

        int i = bitPointer - bitsToMoveBack;
        if (i < 0) {
            bytePointer--;
            bitPointer = 8 + i;
        } else {
            bitPointer = i;
        }
    }
}
