/** * @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;