pdfjs-dist/lib/core/ccitt.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.CCITTFaxDecoder = undefined;

var _util = require('../shared/util');

var CCITTFaxDecoder = function CCITTFaxDecoder() {
  var ccittEOL = -2;
  var ccittEOF = -1;
  var twoDimPass = 0;
  var twoDimHoriz = 1;
  var twoDimVert0 = 2;
  var twoDimVertR1 = 3;
  var twoDimVertL1 = 4;
  var twoDimVertR2 = 5;
  var twoDimVertL2 = 6;
  var twoDimVertR3 = 7;
  var twoDimVertL3 = 8;
  var twoDimTable = [[-1, -1], [-1, -1], [7, twoDimVertL3], [7, twoDimVertR3], [6, twoDimVertL2], [6, twoDimVertL2], [6, twoDimVertR2], [6, twoDimVertR2], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [4, twoDimPass], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimHoriz], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertL1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [3, twoDimVertR1], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0], [1, twoDimVert0]];
  var whiteTable1 = [[-1, -1], [12, ccittEOL], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [11, 1792], [11, 1792], [12, 1984], [12, 2048], [12, 2112], [12, 2176], [12, 2240], [12, 2304], [11, 1856], [11, 1856], [11, 1920], [11, 1920], [12, 2368], [12, 2432], [12, 2496], [12, 2560]];
  var whiteTable2 = [[-1, -1], [-1, -1], [-1, -1], [-1, -1], [8, 29], [8, 29], [8, 30], [8, 30], [8, 45], [8, 45], [8, 46], [8, 46], [7, 22], [7, 22], [7, 22], [7, 22], [7, 23], [7, 23], [7, 23], [7, 23], [8, 47], [8, 47], [8, 48], [8, 48], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [6, 13], [7, 20], [7, 20], [7, 20], [7, 20], [8, 33], [8, 33], [8, 34], [8, 34], [8, 35], [8, 35], [8, 36], [8, 36], [8, 37], [8, 37], [8, 38], [8, 38], [7, 19], [7, 19], [7, 19], [7, 19], [8, 31], [8, 31], [8, 32], [8, 32], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 1], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [6, 12], [8, 53], [8, 53], [8, 54], [8, 54], [7, 26], [7, 26], [7, 26], [7, 26], [8, 39], [8, 39], [8, 40], [8, 40], [8, 41], [8, 41], [8, 42], [8, 42], [8, 43], [8, 43], [8, 44], [8, 44], [7, 21], [7, 21], [7, 21], [7, 21], [7, 28], [7, 28], [7, 28], [7, 28], [8, 61], [8, 61], [8, 62], [8, 62], [8, 63], [8, 63], [8, 0], [8, 0], [8, 320], [8, 320], [8, 384], [8, 384], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 10], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [5, 11], [7, 27], [7, 27], [7, 27], [7, 27], [8, 59], [8, 59], [8, 60], [8, 60], [9, 1472], [9, 1536], [9, 1600], [9, 1728], [7, 18], [7, 18], [7, 18], [7, 18], [7, 24], [7, 24], [7, 24], [7, 24], [8, 49], [8, 49], [8, 50], [8, 50], [8, 51], [8, 51], [8, 52], [8, 52], [7, 25], [7, 25], [7, 25], [7, 25], [8, 55], [8, 55], [8, 56], [8, 56], [8, 57], [8, 57], [8, 58], [8, 58], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 192], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [6, 1664], [8, 448], [8, 448], [8, 512], [8, 512], [9, 704], [9, 768], [8, 640], [8, 640], [8, 576], [8, 576], [9, 832], [9, 896], [9, 960], [9, 1024], [9, 1088], [9, 1152], [9, 1216], [9, 1280], [9, 1344], [9, 1408], [7, 256], [7, 256], [7, 256], [7, 256], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 2], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [4, 3], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 128], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 8], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [5, 9], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 16], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [6, 17], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 4], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [4, 5], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 14], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [6, 15], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [5, 64], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 6], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7], [4, 7]];
  var blackTable1 = [[-1, -1], [-1, -1], [12, ccittEOL], [12, ccittEOL], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [-1, -1], [11, 1792], [11, 1792], [11, 1792], [11, 1792], [12, 1984], [12, 1984], [12, 2048], [12, 2048], [12, 2112], [12, 2112], [12, 2176], [12, 2176], [12, 2240], [12, 2240], [12, 2304], [12, 2304], [11, 1856], [11, 1856], [11, 1856], [11, 1856], [11, 1920], [11, 1920], [11, 1920], [11, 1920], [12, 2368], [12, 2368], [12, 2432], [12, 2432], [12, 2496], [12, 2496], [12, 2560], [12, 2560], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [10, 18], [12, 52], [12, 52], [13, 640], [13, 704], [13, 768], [13, 832], [12, 55], [12, 55], [12, 56], [12, 56], [13, 1280], [13, 1344], [13, 1408], [13, 1472], [12, 59], [12, 59], [12, 60], [12, 60], [13, 1536], [13, 1600], [11, 24], [11, 24], [11, 24], [11, 24], [11, 25], [11, 25], [11, 25], [11, 25], [13, 1664], [13, 1728], [12, 320], [12, 320], [12, 384], [12, 384], [12, 448], [12, 448], [13, 512], [13, 576], [12, 53], [12, 53], [12, 54], [12, 54], [13, 896], [13, 960], [13, 1024], [13, 1088], [13, 1152], [13, 1216], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64], [10, 64]];
  var blackTable2 = [[8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [8, 13], [11, 23], [11, 23], [12, 50], [12, 51], [12, 44], [12, 45], [12, 46], [12, 47], [12, 57], [12, 58], [12, 61], [12, 256], [10, 16], [10, 16], [10, 16], [10, 16], [10, 17], [10, 17], [10, 17], [10, 17], [12, 48], [12, 49], [12, 62], [12, 63], [12, 30], [12, 31], [12, 32], [12, 33], [12, 40], [12, 41], [11, 22], [11, 22], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [8, 14], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 10], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [7, 11], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [9, 15], [12, 128], [12, 192], [12, 26], [12, 27], [12, 28], [12, 29], [11, 19], [11, 19], [11, 20], [11, 20], [12, 34], [12, 35], [12, 36], [12, 37], [12, 38], [12, 39], [11, 21], [11, 21], [12, 42], [12, 43], [10, 0], [10, 0], [10, 0], [10, 0], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12], [7, 12]];
  var blackTable3 = [[-1, -1], [-1, -1], [-1, -1], [-1, -1], [6, 9], [6, 8], [5, 7], [5, 7], [4, 6], [4, 6], [4, 6], [4, 6], [4, 5], [4, 5], [4, 5], [4, 5], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 1], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [3, 4], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 3], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2], [2, 2]];
  function CCITTFaxDecoder(source) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

    if (!source || typeof source.next !== 'function') {
      throw new Error('CCITTFaxDecoder - invalid "source" parameter.');
    }
    this.source = source;
    this.eof = false;
    this.encoding = options['K'] || 0;
    this.eoline = options['EndOfLine'] || false;
    this.byteAlign = options['EncodedByteAlign'] || false;
    this.columns = options['Columns'] || 1728;
    this.rows = options['Rows'] || 0;
    var eoblock = options['EndOfBlock'];
    if (eoblock === null || eoblock === undefined) {
      eoblock = true;
    }
    this.eoblock = eoblock;
    this.black = options['BlackIs1'] || false;
    this.codingLine = new Uint32Array(this.columns + 1);
    this.refLine = new Uint32Array(this.columns + 2);
    this.codingLine[0] = this.columns;
    this.codingPos = 0;
    this.row = 0;
    this.nextLine2D = this.encoding < 0;
    this.inputBits = 0;
    this.inputBuf = 0;
    this.outputBits = 0;
    this.rowsDone = false;
    var code1 = void 0;
    while ((code1 = this._lookBits(12)) === 0) {
      this._eatBits(1);
    }
    if (code1 === 1) {
      this._eatBits(12);
    }
    if (this.encoding > 0) {
      this.nextLine2D = !this._lookBits(1);
      this._eatBits(1);
    }
  }
  CCITTFaxDecoder.prototype = {
    readNextChar: function readNextChar() {
      if (this.eof) {
        return -1;
      }
      var refLine = this.refLine;
      var codingLine = this.codingLine;
      var columns = this.columns;
      var refPos = void 0,
          blackPixels = void 0,
          bits = void 0,
          i = void 0;
      if (this.outputBits === 0) {
        if (this.rowsDone) {
          this.eof = true;
        }
        if (this.eof) {
          return -1;
        }
        this.err = false;
        var code1 = void 0,
            code2 = void 0,
            code3 = void 0;
        if (this.nextLine2D) {
          for (i = 0; codingLine[i] < columns; ++i) {
            refLine[i] = codingLine[i];
          }
          refLine[i++] = columns;
          refLine[i] = columns;
          codingLine[0] = 0;
          this.codingPos = 0;
          refPos = 0;
          blackPixels = 0;
          while (codingLine[this.codingPos] < columns) {
            code1 = this._getTwoDimCode();
            switch (code1) {
              case twoDimPass:
                this._addPixels(refLine[refPos + 1], blackPixels);
                if (refLine[refPos + 1] < columns) {
                  refPos += 2;
                }
                break;
              case twoDimHoriz:
                code1 = code2 = 0;
                if (blackPixels) {
                  do {
                    code1 += code3 = this._getBlackCode();
                  } while (code3 >= 64);
                  do {
                    code2 += code3 = this._getWhiteCode();
                  } while (code3 >= 64);
                } else {
                  do {
                    code1 += code3 = this._getWhiteCode();
                  } while (code3 >= 64);
                  do {
                    code2 += code3 = this._getBlackCode();
                  } while (code3 >= 64);
                }
                this._addPixels(codingLine[this.codingPos] + code1, blackPixels);
                if (codingLine[this.codingPos] < columns) {
                  this._addPixels(codingLine[this.codingPos] + code2, blackPixels ^ 1);
                }
                while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                  refPos += 2;
                }
                break;
              case twoDimVertR3:
                this._addPixels(refLine[refPos] + 3, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  ++refPos;
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVertR2:
                this._addPixels(refLine[refPos] + 2, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  ++refPos;
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVertR1:
                this._addPixels(refLine[refPos] + 1, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  ++refPos;
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVert0:
                this._addPixels(refLine[refPos], blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  ++refPos;
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVertL3:
                this._addPixelsNeg(refLine[refPos] - 3, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  if (refPos > 0) {
                    --refPos;
                  } else {
                    ++refPos;
                  }
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVertL2:
                this._addPixelsNeg(refLine[refPos] - 2, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  if (refPos > 0) {
                    --refPos;
                  } else {
                    ++refPos;
                  }
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case twoDimVertL1:
                this._addPixelsNeg(refLine[refPos] - 1, blackPixels);
                blackPixels ^= 1;
                if (codingLine[this.codingPos] < columns) {
                  if (refPos > 0) {
                    --refPos;
                  } else {
                    ++refPos;
                  }
                  while (refLine[refPos] <= codingLine[this.codingPos] && refLine[refPos] < columns) {
                    refPos += 2;
                  }
                }
                break;
              case ccittEOF:
                this._addPixels(columns, 0);
                this.eof = true;
                break;
              default:
                (0, _util.info)('bad 2d code');
                this._addPixels(columns, 0);
                this.err = true;
            }
          }
        } else {
          codingLine[0] = 0;
          this.codingPos = 0;
          blackPixels = 0;
          while (codingLine[this.codingPos] < columns) {
            code1 = 0;
            if (blackPixels) {
              do {
                code1 += code3 = this._getBlackCode();
              } while (code3 >= 64);
            } else {
              do {
                code1 += code3 = this._getWhiteCode();
              } while (code3 >= 64);
            }
            this._addPixels(codingLine[this.codingPos] + code1, blackPixels);
            blackPixels ^= 1;
          }
        }
        var gotEOL = false;
        if (this.byteAlign) {
          this.inputBits &= ~7;
        }
        if (!this.eoblock && this.row === this.rows - 1) {
          this.rowsDone = true;
        } else {
          code1 = this._lookBits(12);
          if (this.eoline) {
            while (code1 !== ccittEOF && code1 !== 1) {
              this._eatBits(1);
              code1 = this._lookBits(12);
            }
          } else {
            while (code1 === 0) {
              this._eatBits(1);
              code1 = this._lookBits(12);
            }
          }
          if (code1 === 1) {
            this._eatBits(12);
            gotEOL = true;
          } else if (code1 === ccittEOF) {
            this.eof = true;
          }
        }
        if (!this.eof && this.encoding > 0 && !this.rowsDone) {
          this.nextLine2D = !this._lookBits(1);
          this._eatBits(1);
        }
        if (this.eoblock && gotEOL && this.byteAlign) {
          code1 = this._lookBits(12);
          if (code1 === 1) {
            this._eatBits(12);
            if (this.encoding > 0) {
              this._lookBits(1);
              this._eatBits(1);
            }
            if (this.encoding >= 0) {
              for (i = 0; i < 4; ++i) {
                code1 = this._lookBits(12);
                if (code1 !== 1) {
                  (0, _util.info)('bad rtc code: ' + code1);
                }
                this._eatBits(12);
                if (this.encoding > 0) {
                  this._lookBits(1);
                  this._eatBits(1);
                }
              }
            }
            this.eof = true;
          }
        } else if (this.err && this.eoline) {
          while (true) {
            code1 = this._lookBits(13);
            if (code1 === ccittEOF) {
              this.eof = true;
              return -1;
            }
            if (code1 >> 1 === 1) {
              break;
            }
            this._eatBits(1);
          }
          this._eatBits(12);
          if (this.encoding > 0) {
            this._eatBits(1);
            this.nextLine2D = !(code1 & 1);
          }
        }
        if (codingLine[0] > 0) {
          this.outputBits = codingLine[this.codingPos = 0];
        } else {
          this.outputBits = codingLine[this.codingPos = 1];
        }
        this.row++;
      }
      var c = void 0;
      if (this.outputBits >= 8) {
        c = this.codingPos & 1 ? 0 : 0xFF;
        this.outputBits -= 8;
        if (this.outputBits === 0 && codingLine[this.codingPos] < columns) {
          this.codingPos++;
          this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
        }
      } else {
        bits = 8;
        c = 0;
        do {
          if (this.outputBits > bits) {
            c <<= bits;
            if (!(this.codingPos & 1)) {
              c |= 0xFF >> 8 - bits;
            }
            this.outputBits -= bits;
            bits = 0;
          } else {
            c <<= this.outputBits;
            if (!(this.codingPos & 1)) {
              c |= 0xFF >> 8 - this.outputBits;
            }
            bits -= this.outputBits;
            this.outputBits = 0;
            if (codingLine[this.codingPos] < columns) {
              this.codingPos++;
              this.outputBits = codingLine[this.codingPos] - codingLine[this.codingPos - 1];
            } else if (bits > 0) {
              c <<= bits;
              bits = 0;
            }
          }
        } while (bits);
      }
      if (this.black) {
        c ^= 0xFF;
      }
      return c;
    },
    _addPixels: function _addPixels(a1, blackPixels) {
      var codingLine = this.codingLine;
      var codingPos = this.codingPos;
      if (a1 > codingLine[codingPos]) {
        if (a1 > this.columns) {
          (0, _util.info)('row is wrong length');
          this.err = true;
          a1 = this.columns;
        }
        if (codingPos & 1 ^ blackPixels) {
          ++codingPos;
        }
        codingLine[codingPos] = a1;
      }
      this.codingPos = codingPos;
    },
    _addPixelsNeg: function _addPixelsNeg(a1, blackPixels) {
      var codingLine = this.codingLine;
      var codingPos = this.codingPos;
      if (a1 > codingLine[codingPos]) {
        if (a1 > this.columns) {
          (0, _util.info)('row is wrong length');
          this.err = true;
          a1 = this.columns;
        }
        if (codingPos & 1 ^ blackPixels) {
          ++codingPos;
        }
        codingLine[codingPos] = a1;
      } else if (a1 < codingLine[codingPos]) {
        if (a1 < 0) {
          (0, _util.info)('invalid code');
          this.err = true;
          a1 = 0;
        }
        while (codingPos > 0 && a1 < codingLine[codingPos - 1]) {
          --codingPos;
        }
        codingLine[codingPos] = a1;
      }
      this.codingPos = codingPos;
    },
    _findTableCode: function _findTableCode(start, end, table, limit) {
      var limitValue = limit || 0;
      for (var i = start; i <= end; ++i) {
        var code = this._lookBits(i);
        if (code === ccittEOF) {
          return [true, 1, false];
        }
        if (i < end) {
          code <<= end - i;
        }
        if (!limitValue || code >= limitValue) {
          var p = table[code - limitValue];
          if (p[0] === i) {
            this._eatBits(i);
            return [true, p[1], true];
          }
        }
      }
      return [false, 0, false];
    },
    _getTwoDimCode: function _getTwoDimCode() {
      var code = 0;
      var p = void 0;
      if (this.eoblock) {
        code = this._lookBits(7);
        p = twoDimTable[code];
        if (p && p[0] > 0) {
          this._eatBits(p[0]);
          return p[1];
        }
      } else {
        var result = this._findTableCode(1, 7, twoDimTable);
        if (result[0] && result[2]) {
          return result[1];
        }
      }
      (0, _util.info)('Bad two dim code');
      return ccittEOF;
    },
    _getWhiteCode: function _getWhiteCode() {
      var code = 0;
      var p = void 0;
      if (this.eoblock) {
        code = this._lookBits(12);
        if (code === ccittEOF) {
          return 1;
        }
        if (code >> 5 === 0) {
          p = whiteTable1[code];
        } else {
          p = whiteTable2[code >> 3];
        }
        if (p[0] > 0) {
          this._eatBits(p[0]);
          return p[1];
        }
      } else {
        var result = this._findTableCode(1, 9, whiteTable2);
        if (result[0]) {
          return result[1];
        }
        result = this._findTableCode(11, 12, whiteTable1);
        if (result[0]) {
          return result[1];
        }
      }
      (0, _util.info)('bad white code');
      this._eatBits(1);
      return 1;
    },
    _getBlackCode: function _getBlackCode() {
      var code = void 0,
          p = void 0;
      if (this.eoblock) {
        code = this._lookBits(13);
        if (code === ccittEOF) {
          return 1;
        }
        if (code >> 7 === 0) {
          p = blackTable1[code];
        } else if (code >> 9 === 0 && code >> 7 !== 0) {
          p = blackTable2[(code >> 1) - 64];
        } else {
          p = blackTable3[code >> 7];
        }
        if (p[0] > 0) {
          this._eatBits(p[0]);
          return p[1];
        }
      } else {
        var result = this._findTableCode(2, 6, blackTable3);
        if (result[0]) {
          return result[1];
        }
        result = this._findTableCode(7, 12, blackTable2, 64);
        if (result[0]) {
          return result[1];
        }
        result = this._findTableCode(10, 13, blackTable1);
        if (result[0]) {
          return result[1];
        }
      }
      (0, _util.info)('bad black code');
      this._eatBits(1);
      return 1;
    },
    _lookBits: function _lookBits(n) {
      var c = void 0;
      while (this.inputBits < n) {
        if ((c = this.source.next()) === -1) {
          if (this.inputBits === 0) {
            return ccittEOF;
          }
          return this.inputBuf << n - this.inputBits & 0xFFFF >> 16 - n;
        }
        this.inputBuf = this.inputBuf << 8 | c;
        this.inputBits += 8;
      }
      return this.inputBuf >> this.inputBits - n & 0xFFFF >> 16 - n;
    },
    _eatBits: function _eatBits(n) {
      if ((this.inputBits -= n) < 0) {
        this.inputBits = 0;
      }
    }
  };
  return CCITTFaxDecoder;
}();
exports.CCITTFaxDecoder = CCITTFaxDecoder;